Plastic Pelletizing Machine is a specialized equipment that processes various plastic raw materials (new materials, scraps, waste materials, etc.) into standardized plastic pellets through core processes such as melting, extrusion, and cutting. These plastic pellets can serve as the core raw materials for downstream plastic processing industries such as injection molding, blown film, and extrusion molding, and are a key hub in the “raw material processing product production” link of the plastic industry chain.
Classification
Plastic pelletizing machines are classified according to the type of raw materials, based on the source, form, and purity differences of the plastic raw materials used in processing. This classification directly determines the configuration of the equipment’s pre-treatment module, core structure design, and applicable scenarios. It can be divided into two main categories, and some categories can be further subdivided according to the form of the raw materials.
1. New material pelletizing machine (Compounding Extruder or Masterbatch Extruder)
The new material pelletizing machine mainly processes new plastic raw materials, which are usually primary forms obtained after plastic polymerization production (such as resin particles, resin powder), with high purity (almost no impurities), single composition (mostly single variety plastics, such as polyethylene PE, polypropylene PP, polyvinyl chloride PVC, etc.), and stable physical properties.
Due to the fact that raw materials do not require complex impurity removal or morphological treatment, the core focus of equipment design is on “efficient melting and plasticization” and “particle uniformity control” – without the need for pre-treatment units such as crushing, cleaning, and sorting, new materials only need to be fed into the extruder through the feeding system, heated and melted, and then extruded and cut into particles after screw mixing.
Its main application scenario is plastic raw material production enterprises, aiming to process the aggregated block or powder resin into standardized, easy to store and transport plastic particles for downstream plastic product production processes such as injection molding, extrusion, blow molding, etc. (for example, processing PE resin into PE particles for making plastic films and plastic bottles).
2. Recycling material pelletizing machine
The recycling pelletizing machine is designed for the recycling and processing of waste plastics (i.e. plastic waste). These raw materials come from complex sources (such as waste plastic bottles, packaging bags, greenhouse films, injection molding scraps, scrapped plastic parts, etc.) and are not only diverse in form (film, block, sheet, debris, etc.), but may also contain impurities (such as sediment, metal, label paper, adhesives, etc.). Therefore, the equipment must be equipped with targeted pre-treatment units to ensure the quality of the final particles.
According to the morphological differences of waste plastics, recycling pelletizing machines can be further divided into the following categories:
1. Film recycling pelletizing machine
Specialized in processing various types of plastic films (such as greenhouse film, packaging film, plastic film, shopping bags, etc.), these raw materials have a light and thin texture and are easy to wrap. In the pre-treatment process, the film needs to be crushed into small pieces through a “shredder+crusher” to avoid blocking the feeding port. Some parts also need to be cleaned to remove surface oil stains or sediment, and then sent to an extruder for plasticization and granulation. The equipment usually optimizes the feeding system (such as using a forced feeding device) to prevent the film from slipping during transportation.
2. Hard material recycling pelletizing machine
For hard waste plastics such as PET plastic bottles, HDPE plastic drums, PVC pipes, plastic turnover boxes, and scrapped household appliance shells, the pre-treatment process is more complex: first, the labels on the surface of the plastic bottles need to be removed by a “label remover”, then the hard material is crushed into particles by a “crusher”, and then the residue and sediment inside the bottles are removed by a “cleaning tank (multi-stage)”. Finally, the moisture content of the raw materials is reduced by a “dehydrator+dryer” (to avoid bubbles during granulation), and then it enters the extrusion process.
3. Water outlet material/corner material recycling pelletizing machine
The processing of “scraps” generated during plastic processing (such as leftover materials from extruded pipes and sprue/runner materials for injection molded parts) belongs to the category of “industrial grade waste”, characterized by high purity (consistent with the composition of new materials used in production) and few impurities (almost no external pollutants). Therefore, the pretreatment process can be greatly simplified – no complex cleaning is required, only simple crushing (if the size of the scraps is large) is needed, and they can be directly sent to the extruder for granulation. The equipment structure is closer to that of a new material pelletizing machine, but the output is usually suitable for the recycling needs of small and medium-sized waste, commonly seen in the “self-produced and self sold” scenario of injection molding and extrusion production enterprises (i.e. recycling their own waste and remaking it into granules for production).
Development history
The development of plastic pelletizing machines is closely related to the progress of the plastic industry, and its development history is mainly as follows:
Early exploration stage: The granulator industry originated in the early 20th century, mainly used in fertilizer manufacturing at that time. In the 1930s, Italy was one of the first to develop twin-screw pelletizing machines for thermoplastic processing, while Germany manufactured screw injection machines at the same time, laying the foundation for plastic granulation technology. However, at that time, the equipment structure was relatively simple, and there were limitations in production efficiency and plasticization quality. It was mostly used for processing a few basic plastics.
Basic molding stage: In the mid-1950s and mid-1960s, the plastic industry developed rapidly, placing higher demands on the mixing capacity and output of granulation equipment. The hybrid twin-screw extruder and large-scale single screw extruder granulator have emerged and begun to be applied in the processing of various thermoplastic and thermosetting plastics, expanding the application scope of plastic pelletizing machines and improving production scale.
Technological innovation stage: In the 1970s, the “building block” twin-screw extruder was successfully developed. Its screw components and barrel can be flexibly combined according to processing requirements, improving equipment versatility and mixing efficiency, and can handle various complex formula plastics or modified plastic granulation tasks. At the same time, the C.F. Scheer granulation system business unit in Germany was established, and in 1972, the first SGA 300 automatic strip granulator was released to promote the development of strip granulation technology.
Diversified expansion stage: In the 1980s, in order to achieve better plasticization quality and higher production, twin-screw gear pumps and twin-screw single screw series combination extrusion pelletizing machines emerged. Gear pumps can stabilize extrusion pressure and accurately control extrusion volume, suitable for producing high-precision and high-quality plastic particles. The introduction of automation and computer technology into plastic pelletizing machines has begun to achieve automated control, significantly improving production efficiency and product stability.
Green and intelligent development stage: Entering the 21st century, environmental awareness has increased, the market for recycled plastics has grown, and plastic pelletizing machines are developing towards environmental protection, energy conservation, and intelligence. On the one hand, the equipment adopts high-efficiency energy-saving motors, optimized heating and cooling systems, etc., reducing energy consumption. Its exhaust gas, wastewater, and waste treatment functions are strengthened, reducing production pollution. On the other hand, sensors and IoT technology are widely used, and some intelligent granulation machines can monitor the operating status in real time, remotely control and warn of faults, reduce labor costs, and improve production safety.
Application
There are many types of plastic pelletizing machines, and different types of plastic pelletizing machines have different application areas due to their structural and performance characteristics. The following are some common applications of plastic pelletizing machines:
Single screw pelletizing machine
Single screw pelletizing machine: It adopts a three machine integration (crushing, extrusion, granulation) and is mainly used for recycling and granulating plastic films and threads such as PE (polyethylene) and PP (polypropylene), especially for recycling and granulating foam materials.
Single screw pelletizing machine: mainly suitable for granulation of solid materials, suitable for materials with a bulk density exceeding 0.3g/l, and can process various plastics such as PE, PP, PS, PVC, ABS, PA, PC, PET, etc.
Single screw double stage pelletizing machine: mainly suitable for recycling and granulating PE, PP, PS, PA films and filaments, and can be used for films that are relatively dirty, have high impurities, and have a moisture content greater than 5%.
Single screw double stage pelletizing machine: mainly suitable for granulating semi-solid materials, suitable for materials with a bulk density of 0.1-0.3g/l, and can process plastics such as PE, PP, PS, PVC, ABS, PA, PC, PET, etc. It is equipped with a forced feeder and is suitable for materials with high impurities, high moisture content, and large output.
Twin screw pelletizing machine
Parallel twin-screw pelletizing machine in the same direction: It has excellent mixing, good self-cleaning and flexible modular combination, and is widely used in the filling, blending, modification, reinforcement of rubber and engineering resins, devolatilization treatment of chlorinated polypropylene and superabsorbent resins, extrusion of degradable masterbatch, polyamide condensation, polyurethane addition reaction, PET bottle recycling and other fields. It can also be used to prepare various masterbatch such as carbon black masterbatch, color masterbatch, flame retardant masterbatch, degradable masterbatch, etc.
Parallel twin-screw pelletizing machine: mainly used for PET and PVC granulation.
Conical twin-screw pelletizing machine: suitable for modifying and granulating various PVC powders.
Double stage pelletizing machine (mother and child machine): composed of twin-screw and single screw. The first stage is a high-speed co rotating twin-screw extruder, which can perform forced feeding, efficient plasticization mixing, and shear dispersion. The second stage is a low-speed large-diameter single screw extruder, with separate temperature control, low-speed operation, low shear force, and can avoid material decomposition. Widely used in thermosensitive material systems and large-scale devolatilization operations, such as PVC, XLPE, halogen-free flame-retardant cable materials, shielding materials, high concentration carbon black masterbatch, etc. It can also be used for recycling and granulation of waste materials and materials with high moisture content.
Underwater strip pelletizing machine: suitable for thermosensitive plastics such as PET, reducing thermal degradation through underwater cooling, ensuring the quality and performance of particles.
Hot cutting pelletizing machine: Directly cutting molten plastic into pellets, suitable for large-scale production, with uniform particle shape, and can be used for granulation production of various plastics.
Working principle
To understand the working principles of compounding extruders and recycling pelletizing machines, it is necessary to first clarify the core differences between the two: composite pelletizing machines aim for “multi material fusion modification”, while recycling pelletizing machines focus on “waste plastic regeneration and purification”. This difference in goals directly determines the differences in equipment process design and key links.
1. Working principle of compounding extruders
The core requirement of a compounding extruder is to evenly mix two or more materials with different properties (such as different plastic varieties, plastic+fillers, plastic+functional additives, etc.) and process them into composite particles with specific properties (such as “PP+calcium carbonate” composite particles that can reduce costs and enhance hardness, and “PE+flame retardant” composite particles that can have fire resistance). Its workflow revolves around “precise batching → efficient mixing → full plasticization → stable granulation”, and the specific steps are as follows:
1. Raw material pretreatment and precise batching
Firstly, various types of raw materials need to be pre treated: if the raw materials are powders (such as calcium carbonate fillers, flame retardants), they need to be dried to remove moisture (to avoid bubbles during plasticization); If the raw material is particles (such as PP, PE base plastics), impurities need to be screened and removed (to ensure particle uniformity).
Then the basic plastics, fillers, additives and other materials are sent to the mixing unit through the “automatic batching system” (according to the preset formula proportion) – the batching accuracy directly affects the performance of the final composite particles (for example, the deviation of the proportion of additives may lead to the unsatisfactory flame retardancy and anti-aging effects).
2. Initial mixing and high mixing: achieving material pre fusion
The preprocessed material first enters the “initial mixer” (such as a screw belt mixer), and is initially dispersed through low-speed stirring to avoid certain types of materials (such as fine powder additives) floating on the surface due to low density;
Next, enter the “high-speed mixer” (high-speed mixer), which generates shear and friction forces through the high-speed rotating blades, allowing the material to reach a “hot mixing” state in a short period of time (temperature rises to near the plastic softening point) – high temperature can slightly soften the base plastic, enhance the adsorption ability of fillers and additives, and at the same time, high-speed stirring breaks down material aggregates (such as agglomerated powder), achieving “preliminary uniformity at the micro level”.
3. Melting plasticization and forced mixing: ensuring uniformity of ingredients
The pre mixed material is fed into a “twin-screw extruder” (the core component of a compounding extruder, which rarely uses a single screw due to its weak mixing ability) through a feeder (mostly twin-screw feeding to ensure stable feeding):
The extruder barrel is divided into multiple heating zones, and the temperature gradually increases from the feeding section to the machine head, causing the base plastic to gradually melt into a viscous flow state;
Twin screws generate strong shear and kneading effects through “opposite rotation”, forcibly embedding incompletely dispersed fillers and additives into the molecular chains of molten plastics, achieving “macroscopic and microscopic dual uniformity” (such as evenly wrapping calcium carbonate particles in PE melt to avoid particle brittleness caused by excessive local fillers);
At the same time, the “exhaust port” on the barrel will extract residual moisture and low molecular weight volatiles (such as decomposition products of additives) from the material, further improving the purity of the melt.
4. Extrusion cutting and post-processing: forming standardized particles
After fully plasticizing and mixing the composite melt, it is extruded through the “mold hole” of the extruder head (designed according to the particle size) to form a continuous “melt strip”;
The molten strip first enters the “cooling system” (water-cooled or air-cooled, depending on the type of plastic: for example, PVC is afraid of high-temperature hydrolysis, so air-cooled is often used; PE and PP can be cooled by water and quickly cooled to room temperature to harden and solidify;
The hardened material strip is uniformly pulled by a “traction machine” to a “pelletizing machine” (such as a rolling cutter pelletizing machine), and cut into particles according to the preset length;
Finally, the particles enter the “screening machine” to remove waste particles that are too fine or too long, and then pass through a dryer (if water cooling is used, water removal is required) before being packaged and stored. The resulting composite particles must meet the requirements of “uniform composition and stable performance” and be used in downstream injection molding, extrusion, and other processes.
2. Working principle of recycling pelletizing machine
The core requirement of a recycling pelletizing machine is to convert waste plastics (such as waste films, bottles, scraps, etc.) that are disordered in form and contain impurities into pure and reusable recycled particles. Its workflow revolves around “waste plastic purification → form treatment → melt regeneration → granulation”, with the core being “pre-treatment impurity removal” and “melt decontamination”. The specific steps are as follows (taking the most typical “hard material recycling pelletizing machine” as an example, the film/scrap recycling process only simplifies the pre-treatment process):
1. Raw material pretreatment: removing impurities and adjusting morphology
Waste plastics (such as PET bottles and HDPE drums) first enter the pre-treatment unit, which is a key step in recycling and granulation, directly determining the purity of the regenerated particles:
Sorting and classification: Manually or mechanically (such as color sorting machines, density sorting machines) separate different types of plastics (such as PET bottles and PP bottle caps to avoid performance confusion after mixing);
Preliminary impurity removal: For hard materials (such as plastic bottles), first use a “label remover” to peel off the surface label paper (labels are mostly paper or different plastics and need to be recycled separately), and then use a “cap remover” to remove the bottle cap; For thin films (such as greenhouse films), first use a “shredder” to tear the thin film into small pieces (to avoid wrapping around the feeding port);
Crushing treatment: Use a “crusher” (claw knife crusher for hard materials, film crusher for thin films) to crush waste plastics into “crushed materials” (usually 5-10mm in size for subsequent cleaning and feeding);
Cleaning and purification: Crushed materials enter the “multi-stage cleaning tank” (such as hot water tank+alkali water tank+clean water tank), and surface/internal impurities are removed by stirring and spraying: the hot water tank dissolves oil stains, the alkali water tank decomposes adhesives (such as label residue adhesive), and the clean water tank flushes residual chemicals and sediment; After cleaning, enter the “dehydrator” (such as centrifugal dehydrator) to remove surface moisture, and then use the “dryer” (such as hot air dryer) to reduce the moisture content to below 0.5% (to avoid bubbles or hydrolysis during melting).
2. Melting plasticization and impurity removal: achieving regeneration and purification
The dried crushed material is fed into a “single screw extruder” through a “forced feeding machine” (due to the irregular shape of the crushed material, it needs to be forcibly pushed to avoid slipping) (most recycling pelletizing machines use a single screw, which is low-cost and suitable for miscellaneous materials; if purity needs to be improved, twin-screw enhanced shear removal can be used):
The extruder barrel gradually heats up from the feeding section to the machine head, causing the crushed material to soften first and then completely melt into a melt;
During the melting process, the shear force of the screw will further “rub” the melt, dispersing or enveloping small impurities (such as trace amounts of sediment and fibers) that have not been completely cleaned; At the same time, the exhaust port of the barrel will extract low molecular weight substances (such as small molecules generated by aging and residual water from cleaning) remaining in the waste plastic;
Before the melt reaches the machine head, it needs to pass through a “filter screen” (usually a multi-layer metal filter screen with pore sizes ranging from coarse to fine) – the filter screen will intercept solid impurities in the melt (such as metal shavings, unmelted plastic blocks, sediment), ensuring the purity of subsequent particles (the filter screen needs to be replaced regularly to avoid clogging and affecting production).
3. Extrusion granulation and post-treatment: forming regenerated particles
The filtered pure melt is extruded into a melt strip through the head mold, and then enters the “cooling system” (hard materials are mostly water-cooled, and thin film materials can be air-cooled) for cooling and hardening;
The hardened material strip is uniformly pulled by a traction machine to a “pelletizing machine” (such as a flat blade pelletizing machine) for cutting into particles;
Finally, the particles enter the “screening machine” to remove waste particles, and are then dried (if water-cooled) and packaged – the resulting recycled particles can be classified into different grades based on purity (such as first grade recycled materials can be used to produce food packaging related products, and second grade recycled materials can be used to produce pipes, turnover boxes, etc.), returning to the plastic processing industry chain.
Structural characteristics
The structural design of both the compounding extruder and the recycling pelletizing machine revolves around their core functions – the compounding extruder focuses on the “precise fusion of multiple materials” as its core, with a structural emphasis on the “batching mixing” module; The recycling pelletizing machine is centered around the purification and regeneration of waste plastics, with a structural emphasis on the “pretreatment impurity removal” module. The specific structural composition and functional differences are as follows:
1. Core structure of compounding extruder
The structure of the compounding extruder needs to meet the requirements of “precise proportioning of multiple materials, efficient mixing, and sufficient plasticization”. The overall system consists of four modules: pretreatment and batching system, mixing system, extrusion plasticization system, and granulation post-treatment system. The key components and functions under each module are clear:
1. Preprocessing and batching system
This system is the foundation for ensuring uniform composition of composite particles. Its core function is to pre treat the raw materials (remove water and impurities) and accurately mix them according to the formula. It mainly includes:
Raw material drying machine: mostly “hot air circulation drying machine” or “dehumidification drying machine”, for powder fillers (such as calcium carbonate) and hygroscopic plastics (such as PA), the moisture in the raw materials is removed through hot air or dehumidification devices (the moisture content needs to be controlled at 0.1% -0.5%) to avoid the generation of bubbles during subsequent plasticization.
Automatic batching unit: composed of “material bin, spiral feeder, and weighing sensor”, each raw material corresponds to an independent material bin and feeder. The weighing sensor monitors the feeding amount in real time and accurately delivers the raw materials to the mixing system according to the preset formula ratio (such as PP: calcium carbonate: additives=70:28:2), avoiding errors in manual batching.
Screening machine (for pre-processing): installed before the batching unit, it filters large impurities (such as plastic lumps and metal shavings) in the raw materials through different aperture screens to prevent subsequent equipment blockage.
2. Hybrid system
The core function is to upgrade various raw materials (plastics, fillers, additives) from “physical mixing” to “preliminary fusion”, laying the foundation for subsequent plasticization. The key components are:
Primary mixer: mostly a “screw belt mixer”, with double-layer screw belts inside (the outer layer pushes the material outward, and the inner layer pulls the material inward). Different raw materials are initially stirred evenly through low-speed stirring (speed 30-50r/min) to avoid light powders (such as additives) floating on the surface. The mixing time is usually 5-10 minutes.
High speed mixer: also known as “high-speed mixing unit”, composed of “high-speed mixing bucket, stirring blade, heating device”, the stirring blade speed can reach 500-1500r/min, through the shear force and friction generated by high-speed rotation, the material is heated up (close to the softening point of plastic, such as PP about 120 ℃), allowing the plastic to soften slightly and adsorb fillers and additives, while breaking down powder aggregates to achieve “micro preliminary dispersion”. After mixing, the material is in a “loose particle shape”, which is convenient for subsequent feeding.
3. Extrusion plasticization system (core functional module)
This system is the “heart” of composite granulation, responsible for thoroughly melting and forcibly mixing the pre mixed material to achieve uniform fusion of multiple components. The core component is a twin-screw extruder (single screw mixing ability is weak and rarely used for composite granulation). The specific structure includes:
Barrel: divided into 5-10 independent heating zones (gradually increasing temperature from the feeding section to the machine head, such as feeding section 60-80 ℃, plasticizing section 160-180 ℃, homogenization section 180-200 ℃), controlled by electric heating coils or electromagnetic heating to ensure gradual melting of the plastic; There are 1-2 exhaust ports in the middle of the barrel, which are connected to a vacuum pump to extract moisture and low molecular weight volatiles (such as decomposition products of additives) from the material, thereby improving the purity of the melt.
Twin screw: Two parallel screws that rotate in opposite directions (with varying pitch and rib height), with “kneading blocks” and “reverse threaded segments” on the surface – the kneading blocks embed undissolved fillers and additives into the molecular chains of molten plastic through strong shear force, while the reverse threaded segments prolong the residence time of the material, ensuring thorough mixing and ultimately achieving a “uniform composition” state of the melt.
Feeding machine: mostly a “twin-screw forced feeding machine”, which steadily pushes the highly mixed material to the extruder barrel through the screw to avoid uneven feeding and fluctuations in melt quality.
Head and mold: The head is connected to the barrel and is equipped with a “melt splitter” inside, which evenly distributes the uniform melt to multiple holes in the mold (the number of holes matches the particle yield, such as 30 holes and 50 holes), and finally extrudes continuous melt strips.
4. Granulation post-treatment system
The core function is to convert the melt strip into standardized particles, including:
Cooling device: Choose a “water cooling tank” (such as PE or PP, which rapidly cools the melt strip to room temperature and hardens) or an “air cooling cover” (such as PVC, which avoids high-temperature hydrolysis and cools down by strong winds) according to the type of plastic. The cooling tank is equipped with a “guide roller” to ensure smooth movement of the melt strip.
Traction machine: composed of two traction rollers, upper and lower, driven by a motor to rotate at a constant speed, pulling the cooled and hardened material strip to the granulator. The traction speed matches the extrusion speed to avoid stretching or stacking of the material strip.
Granulator: mostly a “rolling cutter type granulator”, consisting of a fixed blade holder and a rotating rolling cutter. The rolling cutter cuts the material strip into fixed length (usually 2-5mm) particles at a preset speed (matched with the traction speed).
Screening and drying unit: The particles are first screened by a “vibrating screening machine” (multi-layer screen) to remove waste particles that are too fine or too long, then by a “hot air dryer” (if water-cooled, remove surface moisture from the particles), and finally enter the finished product bin for packaging.
2. Core structure of recycling pelletizing machine
The structure of the recycling pelletizing machine needs to meet the requirements of “impurity removal, crushing, and regeneration plasticization of waste plastics”. The overall system consists of three modules: pre-treatment system, extrusion plasticization system, and granulation post-treatment system. The “pre-treatment system” is the unique core structure of recycling pelletizing machine, as follows:
1. Pre treatment system (unique to recycling granulation, core impurity removal module)
In response to the chaotic forms and impurities of waste plastics (such as waste bottles, waste films, and scraps), the system achieves “purification+form adjustment” through multiple processing steps, with key components including:
Sorting and classification equipment:
For hard materials (such as PET bottles): equipped with a “label remover” (using a high-speed rotating blade to peel off the label paper on the bottle body, and the label is separated by air selection) and a “cap remover” (using mechanical grippers or centrifugal force to remove the bottle cap, avoiding mixing of different plastics);
For mixed waste: equipped with a “color sorter” (using optical sensors to identify plastics of different colors or materials for jet separation) and a “density sorter” (using the density difference of different plastics to separate them in saline/clean water media, such as PET density of 1.38g/cm ³, which can sink in clean water, and PP density of 0.9g/cm ³, which can float up).
Crushing equipment:
Hard materials (such as plastic bottles and turnover boxes): using a “claw knife crusher” with multiple sets of claw shaped blades inside, the hard materials are crushed into 5-10mm “crushed materials” through high-speed rotation and shearing;
Film (such as greenhouse film, plastic bags): Use a “film specific crusher” with long blades and mesh screens inside to prevent the film from wrapping around the blades and forming small pieces of film material after crushing;
Edge material (such as injection molding edges): Use a “slow crusher” with a low speed (100-300r/min) to avoid high temperature during crushing, which can cause plastic softening and adhesion.
Cleaning and dehydration equipment:
Multi stage cleaning tank: usually consisting of 3-4 continuous tanks, which are sequentially called “hot water tank” (50-60 ℃, for dissolving oil stains and label adhesive), “alkali water tank” (for adding weak alkali to decompose stubborn stains), and “clean water tank” (for rinsing residual chemicals and sediment). The tank is equipped with a stirring blade to enhance the cleaning effect;
Centrifugal dewatering machine: The cleaned crushed material enters the dewatering machine and is subjected to centrifugal force generated by high-speed rotation (1000-1500r/min) to remove surface moisture. After dewatering, the moisture content is reduced to 10% -15%;
Hot air dryer: The dehydrated crushed material enters the dryer and is further reduced to a moisture content of less than 0.5% by hot air at 60-80 ℃ to avoid the formation of bubbles or hydrolysis during subsequent melting (such as PET being prone to hydrolysis when in contact with water, strict control of moisture is required).
2. Extrusion plasticization system (focusing on “impurity removal+regeneration”)
Unlike the “twin-screw” of compounding extruders, recycling pelletizing machines often use single screw extruders (low-cost, adaptable to miscellaneous materials), and some high-purity demand scenarios use twin-screw extruders. The core function is to melt the crushed material and remove residual impurities. The structure includes:
Barrel and screw: The temperature in the heating zone of the barrel is adjusted according to the type of waste plastic (such as PET about 260-280 ℃, PE about 180-200 ℃); The surface of the single screw has a “gradient pitch” (with a large pitch in the feeding section for easy feeding and a small pitch in the plasticizing section for enhanced compression and shear), and the crushed material is pushed to the machine head through screw rotation while melting and plasticizing; There is an exhaust port in the middle of the barrel to extract low molecular weight volatiles produced by aging plastics.
Forced feeding machine: Due to the irregular shape and uneven density of the crushed material, a “spiral forced feeding machine” is needed to stably push the crushed material into the extruder to avoid “bridging” (the crushed material accumulates and blocks at the feeding port).
Filter and screen changer: These are key impurity removal components for recycling granulation – installing a “multi-layer metal filter” (usually 100-200 mesh, fine inner layer and coarse outer layer) in front of the machine head to intercept solid impurities in the melt (such as metal shavings, uncleaned sediment, fibers); To avoid stopping the machine for screen replacement, it is recommended to equip it with an “automatic screen changer” (hydraulic drive, which can replace the filter screen without stopping the machine to ensure continuous production).
3. Granulation post-treatment system (similar to composite granulation, adapted to the characteristics of recycled materials)
The structure and post-treatment system of the compounding extruder are basically the same, but some components are adapted to the characteristics of recycled materials:
Cooling device: For hard material regeneration (such as PET, HDPE), a “water cooling tank” is commonly used, while for thin film regeneration (such as LDPE), a “air-cooled conveyor belt” is often used due to the softness of the material strip (to avoid water cooling causing adhesion of the material strip).
Traction machine and granulator: The speed of the traction machine needs to be accurately matched with the extrusion speed (the strength of the regenerated material melt is low, and too fast a speed can easily break the material strip); The granulator is mostly a “flat blade granulator” (suitable for medium hardness regenerated material strips), and some soft regenerated materials are cut directly in water using an “underwater granulator” (the material strips are cut directly in water to avoid adhesion and achieve more uniform particles).
Screening and storage: Recycled particles need to be removed from waste particles through a “vibration screening machine”, and some high demand scenarios may also add “metal detectors” (to detect trace metal impurities that are not intercepted by the filter screen), and finally enter the finished product storage bin for storage.
Price
The prices of compounding extruders and recycling pelletizing machines can be obtained through professional mechanical magazines, industry research reports, and direct communication with manufacturers. The approximate price information is as follows:
Compounding extruder
Small compounding extruder: A small compounding extruder suitable for small batch production or laboratory applications, typically priced between $15000 to $30000. This type of machine has limited production capacity, usually producing tens of kilograms of plastic pellets per hour, but can meet the experimental and small-scale needs of simple composite formula granulation.
Standard commercial compounding extruder: a common model that can be stably used in industrial production, with a production efficiency of 100 to 300 kilograms per hour, and a price usually ranging from 40000 to 80000 US dollars. It can be used for conventional plastic additive composite, ordinary wood plastic composite processing, etc.
High end multifunctional compounding extruder: If you need to process high-end engineering plastics, precision composite of multiple materials, or large-scale production lines with fiberglass reinforcement, special temperature control, and high automation control systems, the price will far exceed the basic model. High end equipment with an hourly output of over 300 kilograms often costs over $100000, and some flagship models with special customization features can reach $200000 or even higher.
Recycling pelletizing machine
Entry level recycling pelletizing machine: an entry-level model that only has basic recycling granulation functions, mainly processing clean and easy to process PP or PE waste, etc. Its price is generally between $8000 and $15000. Its production capacity is relatively low, and it is mostly used in small-scale waste treatment scenarios or early-stage enterprises.
Mainstream industrial recycling pelletizing machine: equipment designed for common materials such as PE, PP film, PET bottle flakes, and equipped with crushing, cleaning, and single-stage or two-stage granulation modules, typically priced between 30000 to 60000 US dollars. Its hourly output is usually between 100 and 250 kilograms, which meets the needs of most medium-sized waste recycling factories.
Large scale comprehensive recycling granulation production line: a large-scale production line that can comprehensively process various complex waste materials, has high production capacity, and integrates intelligent quality inspection functions, with prices ranging from 80000 to 150000 US dollars. In addition, customized recycling and granulation equipment with special processing requirements, such as handling waste containing special impurities or medical grade waste recycling, will be priced at a higher level according to specific customization requirements.
Common faults and solutions
During the operation of plastic pelletizing machines, various malfunctions are prone to occur due to factors such as raw material characteristics, equipment wear, and improper operation, which directly affect granulation efficiency and product quality. The following are common fault classifications, symptoms, causes, and troubleshooting methods for plastic pelletizing machines. Follow the disassembly instructions of the core system for targeted handling:
1. Extrusion system failure (core granulation process, accounting for over 60% of the total failure)
The extrusion system is the core of melting, plasticizing, and extruding plastic raw materials into strips, and common faults are concentrated in components such as screws, barrels, machine heads, and molds.
Types and solutions of faults in the extrusion system of plastic pelletizing machines
The extrusion system of a plastic pelletizing machine is the core working unit, mainly composed of a barrel, screw, head, heating and cooling device, etc. Its faults directly affect the quality of material plasticization and granulation efficiency. The common types of faults and corresponding treatment methods are as follows:
Screw related faults
1. The screw is severely worn
The malfunction manifests as a significant decrease in production, uneven plasticization of materials (the appearance of unmelted hard blocks in particles), and abnormally high energy consumption. The main reasons include long-term processing of raw materials containing impurities (such as metal shavings, sand and gravel), which accelerates the surface wear of the screw; The wear resistance of the screw material is insufficient, or the temperature setting in the processing technology is too low, resulting in excessive friction between the material and the screw; Failure to regularly lubricate and maintain the screw exacerbates mechanical wear and tear.
Solution: First, stop the machine and disassemble the extrusion system to check the degree of screw wear. If the wear is light, the surface of the screw can be repaired by polishing; If the wear is severe (such as deformation of the screw edges or obvious dents), a new screw should be replaced, and wear-resistant materials (such as 38CrMoAlA nitrided) should be prioritized for the screw. At the same time, optimize the raw material pretreatment process, remove impurities from the raw materials through screening and magnetic separation, and avoid further wear of the screw.
2. Screw stuck
The fault manifests as the screw being unable to rotate, the main motor current suddenly rising or even tripping, and in severe cases accompanied by abnormal noise. The common reason is that large hard objects (such as metal blocks, clumped raw materials) are mixed into the raw materials, which get stuck between the screw and the barrel; Or if the barrel is not preheated properly before starting up, the material cools and solidifies in advance inside the barrel, hindering the rotation of the screw; It is also possible that the clearance between the screw and the barrel during assembly is too small, which may cause jamming due to expansion after heating.
Solution: Immediately stop the machine and cut off the power supply to avoid damage to the main motor. If the hard object is stuck, the machine head and barrel need to be disassembled to remove the hard object stuck inside; If the material solidifies, it is necessary to continue heating the barrel to the set temperature and keep it warm for 30-60 minutes. After the solidified material melts, try slowly rotating the screw; If there is an assembly gap issue, it is necessary to readjust the gap between the screw and the barrel to ensure compliance with the equipment’s technical requirements.
Malfunctions related to the barrel
1. Local overheating of the engine barrel
The fault is manifested as the temperature of a certain section of the barrel far exceeding the set value, and the surface of the barrel is noticeably hot when touched. The material is prone to burning (the particle color turns black and there is an odor). The main reason is that the heater in this section is out of control (such as a short circuit in the heating coil or a malfunction in the temperature controller) and continues to heat up; Or there may be a cooling system malfunction (such as damage to the cooling fan or blockage of the cooling water pipe) that prevents timely removal of heat; It is also possible that the material stays in the barrel for too long, causing local friction and increased heat generation.
Solution: After stopping the machine, check the heater in the overheated section. If the heating coil is damaged, replace it with a new one; If the thermostat malfunctions, repair or replace it to ensure accurate temperature control. At the same time, check the cooling system, clean the scale in the cooling water pipes, repair or replace damaged cooling fans, and ensure smooth cooling channels. In addition, adjust the screw speed or feed speed to avoid excessive material retention in the barrel.
2. Wear or corrosion of the barrel
The fault manifests as scratches and dents on the inner wall of the barrel, uneven plasticization of the material, and an increase in the gap between the screw and the barrel, resulting in a decrease in production. Wear and tear are often caused by long-term processing of impurities in raw materials, or improper coordination between screws and barrels, leading to increased mechanical friction; Corrosion is often caused by processing raw materials containing acidic, alkaline and other corrosive components (such as PVC, modified materials containing plasticizers), which corrode the inner wall of the barrel after long-term contact.
Solution: If the wear or corrosion is minor, the inner wall of the barrel can be repaired by grinding the inner hole to restore its dimensional accuracy; If the damage is severe, a new barrel needs to be replaced. In daily use, try to choose clean raw materials and avoid processing highly corrosive materials; If it is necessary to process corrosive raw materials, corrosion-resistant materials (such as Hastelloy) can be selected for the barrel, or anti-corrosion coating treatment can be applied to the inner wall of the barrel.
Malfunctions related to the machine head and mold
1. Poor or blocked discharge from the machine head
The malfunction manifests as a decrease in the amount of material discharged from the machine head, or even no discharge at all, and material accumulation at the mold mouth. The main reason is poor plasticization of the material (such as low heating temperature and slow screw speed), which does not form a uniform melt; Or there may be foreign objects blocking the mold mouth (such as burnt materials, impurities); It may also be due to unreasonable mold design (such as narrow flow channels or improper angles), which hinders material flow.
Solution: First check the plasticization of the material, increase the heating temperature of the barrel and head appropriately, adjust the screw speed to ensure complete plasticization of the material. If the discharge is still not smooth, stop the machine and disassemble the machine head, clean the burnt materials and impurities in the mold mouth, and use special tools (such as copper brushes and scrapers) to clean the flow channel to avoid scratching the mold. If there is a problem with the mold design, it is necessary to contact the manufacturer to optimize the mold flow channel structure, expand the narrow part, and adjust the flow channel angle.
2. Uneven discharge from the mold mouth
The fault is manifested as a large difference in the discharge volume of each discharge hole in the mold mouth, resulting in inconsistent particle sizes in subsequent cutting. The common reasons are uneven heating of the mold (such as damage to the heating ring of the mold head), different temperatures in different areas, and significant differences in the viscosity of the material melt; The size of each hole in the mold mouth may be inconsistent, resulting in machining errors; It may also be due to uneven mixing of materials inside the barrel and large fluctuations in melt pressure.
Solution: Check the heating ring of the mold head, replace the damaged heating ring, and ensure that the temperature in each area of the mold head is consistent. Measure the dimensions of each hole in the mold mouth with a caliper, and repair holes with large dimensional deviations (such as expanding or polishing) to ensure uniform dimensions of each hole. At the same time, adjust the screw speed and feed speed to stabilize the melt pressure inside the barrel and avoid pressure fluctuations affecting the discharge.
Heating and cooling system malfunction
1. Heating system failure
The fault manifests as the inability of the barrel or head temperature to reach the set value, insufficient material plasticization, and difficulty in discharging. The reasons include burning of the heating coil, poor contact of the heating circuit (such as loose wiring terminals and aging wires), and malfunction of the temperature sensor (unable to accurately detect temperature, resulting in the temperature controller not outputting heating signals).
Solution: Use a multimeter to check the heating coil and heating circuit, replace the burnt heating coil, tighten loose wiring terminals, and replace aging wires. Check the temperature sensor. If the sensor is damaged, replace it with a sensor of the same model to ensure accurate temperature detection and enable the thermostat to control the heating system normally.
2. Cooling system failure
The fault is manifested as high temperature of the barrel or screw, easy burning of materials, or poor particle forming caused by high mold temperature (such as particle adhesion). The main reasons are blocked cooling water pipes, damaged cooling water pumps (unable to circulate water supply), faulty cooling fans (unable to dissipate heat), or insufficient supply of cooling media (such as water and air).
Solution: Clean the dirt and impurities in the cooling water pipe to ensure smooth water flow; Repair or replace damaged cooling water pumps and fans to ensure normal supply of cooling medium. If the cooling effect is still poor, the flow rate of the cooling medium can be increased (such as increasing the pressure of the water pump), or cooling devices can be added in high-temperature areas (such as additional cooling fans).
2. Particle cutting system malfunction (affecting particle shape and size consistency)
The granulation system is divided into “water ring granulation” and “air-cooled granulation”, and faults are often related to the synchronization of cutting blades, cooling, and feeding.
1. Uneven particle size (varying in length/thickness)
Reason:
1. Wear and tear of the cutting blade (the blade becomes dull, unable to cut the material strip, resulting in “trailing particles”);
2. The gap between the cutting blade and the mold mouth is too large (gap>0.1mm, the material strip is deformed by compression);
3. The traction speed of the material strip is not synchronized with the cutting speed (fast traction results in longer particles, slow traction results in shorter particles).
solve:
1. Replace the cutting blade (or grind the blade with a grinding wheel to ensure sharpness);
2. Adjust the position of the cutter: manually rotate the cutter to ensure that the blade is in contact with the mold mouth (gap ≤ 0.05mm);
3. Calibration synchronicity: According to the formula of “particle length=traction speed/cutter speed”, reset the parameters (for example, if the target particle length is 3mm and the traction speed is 3m/min, then the cutter speed=3000mm/min ÷ 3mm/particle=1000 revolutions per minute).
2. Water ring cutting particle “clay” (particle agglomeration)
Reason:
1. The temperature of the cooling water is too high (>40 ℃, unable to quickly cool the particles, resulting in adhesion);
2. Insufficient cooling water flow (poor cooling effect, particle surface not hardened);
3. The moisture content of the particles is too high (due to dehydration device failure and residual moisture causing clay particles).
solve:
1. Reduce water temperature: Check the cooling water tank and refrigeration unit to ensure that the water temperature is controlled at 20-30 ℃;
2. Increase flow rate: Clean the blockage in the cooling water pipeline and check the water pump pressure (≥ 0.3MPa);
3. Repair dehydration: Check the dehydrator (such as centrifugal dehydrator, air selection dehydrator) to ensure that the moisture content of the particles after dehydration is less than 0.5%.
3. Transmission system failure (equipment power core, failure can easily lead to shutdown)
The transmission system consists of motors, reducers, couplings, bearings, etc., and faults often manifest as “abnormal noise, vibration, and insufficient power”.
1. Motor overload (tripping/overheating)
Symptoms: The temperature of the motor casing is greater than 70 ℃, the overload protection of the distribution box trips, and the screw stops rotating.
Reason:
1. Screw jamming (there are hard impurities inside the barrel that jam the screw);
2. Loose motor wiring (poor contact, excessive current);
3. Insufficient oil in the reducer (increased gear friction resistance, obstructed load transmission).
solve:
1. Emergency stop: Cut off the power, remove the machine head mold, rotate the screw in the opposite direction, and clean the stuck material impurities;
2. Check the wiring: Open the motor junction box, tighten the wiring terminals (to avoid virtual connections), and measure the three-phase current of the motor (to be balanced with a deviation of ≤ 5%);
3. Add lubricating oil: Open the oil inlet of the reducer and add specialized gear oil (according to the equipment manual model, such as 220 # industrial gear oil), with the oil level reaching the centerline of the oil mark.
2. Abnormal noise from the reducer (making a “clunking” sound during operation)
Reason:
1. Gear wear (long-term operation leading to tooth surface peeling and tooth breakage);
2. Bearing damage (worn ball bearings, increased clearance, abnormal noise during rotation);
3. Lubricating oil deterioration (metal debris mixed into the oil, rendering the lubrication effect ineffective).
solve:
1. Check the gears: Disassemble the reducer and observe the gear tooth surface (if there is peeling/broken teeth, replace the gear set);
2. Replace bearings: Check the bearing clearance (if the radial clearance is greater than 0.1mm, it needs to be replaced), and add lubricating grease (such as lithium based grease) during installation;
3. Replace lubricating oil: Drain the old oil, rinse the inside of the reducer with kerosene, and add new oil to the specified level.
4. Heating system malfunction (affecting the quality of raw material plasticization)
The heating system includes barrel heating coils, mold heating coils, and thermocouples, and malfunctions directly lead to “poor plasticization”.
1. The heating coil does not generate heat
Reason:
1. The resistance wire of the heating coil burns out (due to long-term high-temperature aging or short circuit caused by material leakage);
2. The temperature controller has no output (the internal relay of the temperature controller is damaged and cannot supply power to the heating coil);
3. Circuit break (loose heating coil terminals, aging and broken wires).
solve:
1. Check the heating coil: Use a multimeter to measure the resistance of the heating coil (the normal resistance value should comply with the equipment manual, such as a 2kW heating coil resistance of about 24 Ω). If the resistance is infinite, it needs to be replaced;
2. Repair the thermostat: replace the internal relay of the thermostat, or directly replace it with a new thermostat;
3. Check the circuit: Re tighten the wiring terminals and replace the aging wires (high-temperature resistant wires are required, with a temperature resistance of ≥ 200 ℃).
2. Temperature runaway (continuous increase in temperature, unable to cool down)
Reason:
1. The temperature controller is “out of control” (internal chip failure, output signal remains “heating”);
2. Cooling system failure (cylinder cooling water valve stuck, unable to enter water for cooling);
3. Thermocouple malfunction (measuring temperature deviation, causing the temperature controller to misjudge “low temperature” and continue heating).
solve:
1. Emergency power outage: Immediately cut off the power supply of the heating system to avoid overheating and damage to the barrel/mold;
2. Check the cooling valve: manually open the cooling water valve to ensure normal water flow, and repair the stuck solenoid valve;
3. Calibrate thermocouple: Compare the measured temperature with a standard thermometer (if the deviation is greater than 5 ℃, replace the thermocouple), and recalibrate the temperature controller parameters.
5. Common fault prevention suggestions (core measures to reduce failure rates)
1. Raw material pretreatment: All raw materials must be dried (especially moisture absorbing materials such as PA and PC), and impurities must be removed (by installing magnetic separation and filter screens) to avoid impurities getting stuck or moisture causing bubbles;
2. Regular maintenance:
Daily: Check the oil level (motor, reducer), cooling water flow rate, and temperature parameters;
Weekly: Clean the mold mouth coke, replace the feed filter screen, and check the wear of the cutting blade;
Monthly: Disassemble screws to check wear, clean cooling water tank, calibrate temperature control system;
3. Standardized operation:
Before starting up: Preheat the barrel/mold to the set temperature (hold for 30 minutes), manually rotate the screw to confirm there is no blockage;
Before shutdown: Clean the machine barrel/mold with cleaning material to avoid residual carbonization of raw materials;
Avoid overload: It is strictly prohibited to use beyond the range of raw materials (such as PVC pelletizing machines cannot be used for PE to avoid corrosion of the machine barrel).
Through the above classification and troubleshooting, the fault point of the plastic pelletizing machine can be quickly identified and resolved. If the fault involves serious damage to core components such as screws and reducers, it is recommended to contact the equipment manufacturer for professional maintenance to avoid disassembling and causing secondary damage.
Purchase suggestions
The selection of plastic pelletizing machines requires comprehensive consideration of multiple key factors such as raw material characteristics, production requirements, and equipment performance. Specific recommendations are as follows:
Select equipment based on the characteristics of raw materials
Common thermoplastic materials: If processing ordinary plastics such as PP, PE, ABS, etc., the single screw extruder has a simple structure and low maintenance cost, making it suitable for small and medium-sized production lines. Processing raw materials such as woven bags, greenhouse films, and plastic films can meet the demand.
Complex or modified plastics: For processing high filling, high viscosity materials, or producing modified plastics, masterbatch and other products that require sufficient mixing, twin-screw extruders have better mixing and plasticizing effects. If the raw material contains a lot of impurities, it needs to be matched with a high-efficiency filter screen changer. High end regenerated particles and transparent materials are produced, and a mesh free automatic filter is preferred; Ordinary regeneration granulation can choose hydraulic screen changing filter.
Thermally sensitive plastics: When processing heat sensitive raw materials such as PVC or biodegradable plastics that are prone to thermal decomposition, it is advisable to choose equipment that can accurately control temperature and pair it with high-efficiency cooling equipment such as water ring pelletizing machines to prevent material overheating.
Determine the model based on the production scale
Small scale production line: For individual businesses or small-scale recycling plants with a production capacity of 2 to 3 tons per shift, small single screw extruders, single board dual station screen changers, and water-cooled strip cutters can be selected, with lower investment costs.
Mid to high end production line: If the output of each shift reaches 3 to 7 tons, or high-quality products such as food grade plastics are produced, twin-screw extruders, mesh free die heads, water ring pelletizers, and centrifugal dehydration systems can be used to balance efficiency and quality.
Large production line: For situations where the hourly output is over 1 ton, a large counter rotating twin-screw extruder and automated conveying and packaging system are required. It is recommended to use a combined cooling system of circulating water cooling and air cooling to achieve efficient and energy-saving production.
Pay attention to the quality of core components
Screw and barrel: They need to be made of wear-resistant and high-temperature resistant materials, such as 38CrMoAlA, which is ideal for nitriding treatment. Specific structural screws can be selected according to actual needs to achieve enhanced mixing or high shear effects.
Motor and reducer: Priority should be given to well-known brands, whose power should be compatible with the equipment’s production capacity and screw torque to ensure stable operation and energy saving.
Consider heating and cooling systems
Heating system: Electromagnetic heating or nanoheating is more energy-efficient than traditional resistance heating. And it needs to be equipped with a precise temperature control system, high temperature control accuracy helps ensure good plastic plasticization effect.
Cooling system: Water tank cooling has low cost and is suitable for the process of pulling and cutting grains. The air-cooled system is suitable for hot cutting pellets and is more environmentally friendly. For large-scale production lines or high demand scenarios, water circulation or underwater cooling methods have the highest cooling efficiency. If there is concern about wastewater issues, water circulation devices can be added.
Emphasize after-sales service
Priority should be given to manufacturers with strong technical strength and excellent research and development capabilities, who can provide continuous technical support and facilitate subsequent equipment upgrades and renovations. Confirm that the manufacturer can provide timely equipment installation, debugging, personnel training, and other services. The equipment warranty period is usually not less than 1 year, and beyond the warranty period, it must be able to provide maintenance and discounted supply of parts and other services.
Plastic pelletizing machine manufacturers
Foreign manufacturers
KOBELCO: Established in Japan in 1997, Kobe Compressor Manufacturing (Shanghai) Co., Ltd. is responsible for its domestic business. It relies on the deep technical foundation of Shengang Group, integrates its compressor research and development experience with plastic granulation equipment, and has high-performance and high-quality characteristics.
JSW Nippon Steel: also known as Nippon Steel Corporation, established in 1907, is a comprehensive manufacturer of steel and machinery. With the advantage of high-quality steel manufacturing and over 60 years of research and development experience in injection molding machines, its plastic granulator has outstanding performance in large-scale and precision manufacturing. Its products cover various types such as injection molding machines and extruders, and its sales network covers the world.
Nordson, founded in 1954 in the United States, is a leading manufacturer of precision fluid dispensing systems. It applies precision fluid control technology to the manufacturing of plastic granulators, which can optimize material plasticization and extrusion processes. Its equipment is commonly used in high-end plastic processing and new material research and development fields that require precise control.
Zerma: A German company known for producing high-performance crushing and granulation equipment. Its products are commonly used in waste plastic recycling and scenarios that require strong crushing and granulation.
Coperion: It is a global leader in plastic compounding extrusion systems and bulk material conveying systems, with Coperion (Nanjing) Machinery Co., Ltd. as its subsidiary in China. Its products are widely used in various fields such as food, pharmaceuticals, plastics, and chemicals, with over a hundred patents and more than ten production bases worldwide. Its sales network covers more than 150 countries and regions.
MAAG: It has many years of professional technical experience in underwater granulation, drying, and strip granulation. It integrates well-known product lines such as Gala and Automatik, and its modular granulation system is suitable for various applications such as mixing, masterbatch production, and plastic recycling. The LPU series is suitable for laboratory small-scale trial production, and the E series thermoplastic granulation and drying system has an output rate of up to 1500kg/h.
Rapid Granulator: It is a leading global brand of granulators, with products covering various application fields. Its latest equipment adopts modular design, which can flexibly adjust configuration according to user needs, and is equipped with intelligent control system, which can improve production efficiency and product quality.
Matsui Mfg: It is a well-known Japanese brand specializing in plastic recycling and granulation equipment. It adopts advanced cutting technology to process various types of waste plastics and improve particle uniformity. It also focuses on optimizing design to reduce exhaust gas and noise emissions.
Chinese manufacturers
Nanjing Kerke Extrusion Equipment Co., Ltd.: Nanjing Kerke Extrusion Equipment Co., Ltd. is a leader in the field of twin-screw extruders in China. Its main products are co directional block type parallel twin-screw extruder and spare parts. Specifically covering KTE series twin-screw extrusion granulation units, KTE-SE series two-stage single twin-screw composite mixing granulation units, SE series single screw mixing extrusion granulation units, RSE series single screw waste film recycling granulation units, as well as volumetric metering feeding systems, etc. The product can be used in many fields such as plastics, rubber, food, pet food, etc., and is suitable for various operations such as polymer material blending, plasticization, coloring, recycling, etc.
Polyretec Company: Polyretec is an enterprise dedicated to the research and application of plastic recycling and extrusion granulation technology, engaged in the development and manufacturing of crushing and washing equipment, recycling and regeneration granulation extrusion production lines, polymer material modification, and twin-screw extrusion equipment for the recycling and reuse of waste plastics. We can provide customers with a complete set of production processes, technical solutions, and complete production equipment for waste plastic recycling and granulation. The products include PET bottle crushing and washing granulators, PE/PP soft and solid material crushing and washing granulators, as well as ABS, PS, PA, PVC, PC and other crushing and washing granulators. For example, the complete set of equipment for crushing, washing, recycling, and granulation of solid waste (hazardous waste) PE/PP plastics can have a processing capacity of 300 to 5000 kg/h.
Jinwei Machinery: Founded in 1997 and located in Shanghai, it is a vice president unit of the Plastic Machinery Industry Association, specializing in the manufacturing of complete sets of plastic extrusion and chemical fiber spinning equipment. There are multiple production bases both domestically and internationally, producing over 3000 sets of high-end plastic extrusion production lines annually. Our products are sold well in more than 120 countries and regions.
Da Rubber DXS: Founded in 1907, it is the cradle of rubber and plastic machinery in China and is now under the jurisdiction of Dalian Heavy Industry Crane Group. It has international R&D and manufacturing capabilities, completed multiple national major technical equipment research and development tasks, and its granulator products are widely used in many fields such as automobiles, petrochemicals, and military industry, and exported to more than 70 countries and regions.
Beier Machinery: Founded in Jiangsu in 1998, it is an integrated equipment supplier for plastic extrusion and recycling technology. Its PVC blending and plastic solid waste recycling production lines have served more than 130 countries and regions worldwide.
TONGJIA: A modern comprehensive enterprise group in Shandong, mainly engaged in high-speed extrusion production lines, intelligent injection molding machines, etc. Its plastic granulation equipment is characterized by intelligence and high production capacity, and the equipment is sold to various parts of China and over 90 overseas countries and regions.
Useon: Founded in 2006, it is a professional supplier of polymer material extrusion equipment, providing comprehensive solutions for polymer material extrusion processing. It is at the forefront of the industry in plastic blending, foam extrusion, and special film direct extrusion technology.
Nanjing Sanpu: It focuses on the technology of powder material processing equipment, develops and manufactures dry, wet, melt granulation and other related equipment and complete process technologies, and its business is involved in many industries such as petrochemicals, environmental protection, and biochemistry.
Shanghai Ruibao Granulator Co., Ltd.: Established in 2000, it focuses on the granulation industry. Its products draw on German technology and have independent innovation characteristics. Its resin granulator and other products have been appraised at the ministerial level and have multiple national patents, which are exported to multiple countries.
Wuxi Huachen Electromechanical Industry Co., Ltd.: It is a senior supplier of granulation equipment, founded in 1995. Its underwater granulation system technology is mature and widely used in granulation operations in industries such as thermoplastic elastomers and engineering plastics.
