As a key equipment in plastic molding and processing, extrusion blow molding machines will experience damage to some parts due to wear, fatigue, high-temperature aging and other factors during long-term high-intensity operation, which need to be replaced regularly. The prices of these wear parts directly affect the equipment maintenance costs of enterprises. This article will sort out the core wear parts of extrusion blow molding machines, analyze the price fluctuation rules and influencing factors combined with the latest market quotations (in US dollars), and provide references for enterprise procurement and cost control.

I. Classification of Core Wear Parts and Corresponding Price Ranges

According to the structural functions of extrusion blow molding machines, wear parts are mainly concentrated in the extrusion system, die head system, heating and temperature control system, traction and winding system, and pneumatic auxiliary system. The following sorts out the price ranges of various core wear parts based on the latest quotations from 2025 to 2026 on major industrial procurement platforms such as Alibaba and Made-in-China.

(I) Wear Parts of Extrusion System

The extrusion system is the “heart” of the equipment, responsible for the melting, plasticizing and conveying of plastic raw materials. The core wear parts are screws, barrels and check rings, and their prices are significantly affected by materials (ordinary steel, bimetallic alloy) and specifications (diameter, length).

• Screw and Barrel Assembly: As core wear parts, long-term friction with high-temperature plastic melt leads to increased gaps. The unit price of ordinary nitrided steel is 300-1000 US dollars/set; the price of bimetallic alloy (such as 38CrMoAlA, SKD11) is increased to 571-8000 US dollars/set due to better wear resistance and high-temperature resistance, and the unit price of large-size twin-screw assemblies can even reach 5800-8000 US dollars/set. Among them, the unit price of 65/28 specification screws and barrels dedicated to nylon and PU is about 500 US dollars, and the unit price of screws dedicated to degradable plastics can reach 8000 US dollars.
• Check Ring/Gluing Head: Used to prevent melt backflow, it is easily worn by the impact of high-pressure melt. The market unit price is 23.23-54.20 US dollars/piece, and the price for bulk purchase (more than 10 pieces) can be as low as 20 US dollars/piece.
• Melt Filter Screen: Filters impurities in raw materials, is easily blocked and damaged, and needs to be replaced frequently. The unit price of a single screen is 0.10-0.50 US dollars, and the price for 1000 pieces is as low as 0.10 US dollars/piece; the overall unit price of a quick screen changer with a screen is 100-1000 US dollars/unit.

(II) Wear Parts of Die Head System

The die head system determines the molding accuracy of plastic films/products. The wear parts include the die head body, die lip, mandrel and cooling air ring, and the price is related to processing accuracy and material finish.

• Die Head Body: Divided into ordinary fixed die heads and rotating die heads, which are worn due to high-temperature melt corrosion and carbon deposit cleaning. The unit price of ordinary LDPE/HDPE die heads is 500-800 US dollars/unit; the price of rotating die heads is increased to 750-3000 US dollars/unit due to complex structure. The unit price of high-precision die heads of Taiwan quality is about 500 US dollars, and the unit price of large-size die heads (diameter 90-1000mm) can reach 780-8000 US dollars/unit.
• Die Lip and Mandrel: As key molding components, surface wear will lead to uneven product thickness. The unit price of a single set of accessories is 100-500 US dollars, which needs to be accurately matched with the die head specification.
• Cooling Air Ring: Used for rapid shaping of film bubbles, the air outlet is easily blocked by dust, affecting the cooling effect. The unit price of a double-air outlet cooling air ring is 800-850 US dollars/unit, and the price of a high-precision air ring with an internal cooling system can reach more than 1000 US dollars.

(III) Wear Parts of Heating and Temperature Control System

The heating and temperature control system ensures stable processing temperature. The wear parts are heating coils, thermocouples and temperature controllers, which are low-value accessories that need to be replaced frequently.

• Heating Coil: Divided into resistance heating coils and infrared heating tubes, which are prone to open circuits and aging after long-term high-temperature work. The unit price of ordinary resistance heating coils is 15-50 US dollars/piece; the unit price of 2000W infrared quartz heating tubes is 15.49 US dollars/piece, with a minimum order of 10 pieces.
• Thermocouple (Temperature Sensor): Used for temperature detection, which is easily damaged by high-temperature oxidation and mechanical vibration. The unit price of 3m/4m specifications is 20-50 US dollars/piece, and the service life is 1-2 years.
• Temperature Controller/Torque Controller: Electrical components are prone to contact oxidation and program failures after long-term work. The unit price of LJ KY-III 20A torque controller is 62-65 US dollars/unit; the unit price of ordinary temperature control instruments is 30-100 US dollars/unit.

(IV) Wear Parts of Traction and Winding System

The traction and winding system is responsible for the stable transportation and winding of products. The wear parts are traction rollers, friction rings and accessories of deviation correction devices.

• Traction Roller Friction Sleeve/Friction Ring: Drives product transportation by friction, and long-term friction leads to low surface roughness. The unit price of key-style friction rings is 50 US dollars/piece; the unit price of traction roller rubber sleeves is 18-45 US dollars/piece.
• Automatic Deviation Correction Sensor: Ensures neat winding, which is prone to failures due to vibration and dust, with a unit price of 100-300 US dollars/piece.
• Winding Tension Controller: Controls the winding force, and electrical components are prone to aging, with a unit price of 80-200 US dollars/unit.

(V) Wear Parts of Pneumatic Auxiliary System

The pneumatic system provides power for die head opening and closing and traction braking. The wear parts are sealing rings, cylinders and solenoid valves, most of which are standard parts with relatively low prices.

• Sealing Ring/Oil Seal: Easily aging and deformed under high-temperature and high-pressure environments, it is the most frequently replaced part. The unit price is 0.50-10 US dollars/piece, and the price for 100 pieces is as low as 0.10 US dollars/piece.
• Cylinder: Wear of internal piston seals leads to air leakage, with a unit price of about 500 US dollars/unit; the unit price of small solenoid valves is 20-50 US dollars/piece.
• Air Filter Element: Filters impurities in compressed air, is easily blocked, with a unit price of 10-30 US dollars/piece.

II. Analysis of Price-Influencing Factors

Through sorting out market quotations, the price difference of wear parts of extrusion blow molding machines is mainly affected by the following four factors:

(I) Material and Process Level

Material is the core factor determining the price. For example, the price of bimetallic alloy screw and barrel is 2-5 times higher than that of ordinary nitrided steel products because it adopts plasma spraying technology, which has higher surface hardness and better wear resistance; when die head parts adopt precision processing technology (such as mirror polishing), the price is 30%-50% higher than that of ordinary processed products. For parts used in high-temperature working conditions (such as heating coils and thermocouples), the price of products made of high-temperature resistant materials (quartz, high-temperature alloy) is also significantly higher than that of ordinary materials.

(II) Specification and Customization Requirements

The larger the part specification, the higher the price. Taking the screw and barrel as an example, the unit price of small-size assemblies with a diameter of less than 50mm is 300-800 US dollars, while the unit price of large-size assemblies with a diameter of more than 80mm can reach 1000-8000 US dollars; customized parts (such as special specification die heads and non-standard screws) need to re-open molds or adjust processing processes, so the price is 50%-100% higher than that of standard parts, and the minimum order quantity is also higher (usually more than 10 pieces).

(III) Brand and Origin

The price of imported brands (such as Germany and Taiwan region) parts is 2-3 times higher than that of Chinese parts. For example, the unit price of die heads of Taiwan quality is 500 US dollars, while the unit price of Chinese die heads of the same specification is 300-400 US dollars; the unit price of German bimetallic alloy screw and barrel can reach 2000-5000 US dollars/set, far exceeding that of similar Chinese products of 571-2571 US dollars/set. Among Chinese parts, the price of products from well-known Chinese manufacturers (such as Zhoushan Screw) is 10%-20% higher than that of small factories, but the quality stability is more guaranteed.

(IV) Purchase Quantity and Purchase Channel

Bulk purchase can significantly reduce the unit price. For example, the price of buying 1 torque controller is 65 US dollars, and the unit price can be reduced to 62 US dollars for an order of 10 pieces; the price of 1000 filter screens is 0.10 US dollars/piece, which is much lower than the retail price of 0.50 US dollars/piece. In addition, purchasing directly from manufacturers is 10%-15% cheaper than purchasing through intermediaries, and some manufacturers also provide annual free accessory quotas of 500 US dollars for long-term cooperative customers.

III. Price Summary and Procurement Suggestions

The price range of wear parts of extrusion blow molding machines is relatively large, ranging from 0.10 US dollars for filter screens to 8000 US dollars for large screw assemblies, which can be divided into three cost ranges: low-value and high-frequency replacement parts (0.10-50 US dollars, such as sealing rings, filter screens, heating coils), medium-value regular replacement parts (50-1000 US dollars, such as die heads, air rings, cylinders), and high-value core replacement parts (1000-8000 US dollars, such as screw and barrel assemblies). In the enterprise’s maintenance costs, high-value core parts account for 60%-70%, but the replacement frequency is low (once every 1-3 years); low-value parts have a high replacement frequency (monthly/quarterly), and the annual cumulative cost also needs to be taken seriously.

Based on the price analysis, the following procurement suggestions are put forward: 1) For core parts (screw and barrel, die head), priority should be given to well-known brand products made of bimetallic alloy materials. Although the initial procurement cost is high, the service life is extended by 2-3 times, which is more economical in the long run; 2) Low-value standard parts (sealing rings, filter screens) can be stored in bulk, and the unit price can be reduced by direct procurement from manufacturers; 3) For non-core parts, cost-effective Chinese standard parts can be selected to reduce maintenance costs; 4) Establish a part replacement account, and purchase in advance according to the wear cycle to avoid shutdown losses caused by part shortages.

Note: The price data in this article is sourced from the public quotations of major industrial procurement platforms from 2025 to 2026. The actual procurement price may be adjusted due to factors such as market supply and demand, exchange rate fluctuations, and cooperation terms. It is recommended to confirm the latest quotation with the supplier before procurement.

As a key equipment in plastic molding and processing, extrusion blow molding machines will experience damage to some parts due to wear, fatigue, high-temperature aging and other factors during long-term high-intensity operation, which need to be replaced regularly. The prices of these wear parts directly affect the equipment maintenance costs of enterprises. This article will sort out the core wear parts of extrusion blow molding machines, analyze the price fluctuation rules and influencing factors combined with the latest market quotations (in US dollars), and provide references for enterprise procurement and cost control.

I. Classification of Core Wear Parts and Corresponding Price Ranges

According to the structural functions of extrusion blow molding machines, wear parts are mainly concentrated in the extrusion system, die head system, heating and temperature control system, traction and winding system, and pneumatic auxiliary system. The following sorts out the price ranges of various core wear parts based on the latest quotations from 2025 to 2026 on major industrial procurement platforms such as Alibaba and Made-in-China.

(I) Wear Parts of Extrusion System

The extrusion system is the “heart” of the equipment, responsible for the melting, plasticizing and conveying of plastic raw materials. The core wear parts are screws, barrels and check rings, and their prices are significantly affected by materials (ordinary steel, bimetallic alloy) and specifications (diameter, length).

• Screw and Barrel Assembly: As core wear parts, long-term friction with high-temperature plastic melt leads to increased gaps. The unit price of ordinary nitrided steel is 300-1000 US dollars/set; the price of bimetallic alloy (such as 38CrMoAlA, SKD11) is increased to 571-8000 US dollars/set due to better wear resistance and high-temperature resistance, and the unit price of large-size twin-screw assemblies can even reach 5800-8000 US dollars/set. Among them, the unit price of 65/28 specification screws and barrels dedicated to nylon and PU is about 500 US dollars, and the unit price of screws dedicated to degradable plastics can reach 8000 US dollars.
• Check Ring/Gluing Head: Used to prevent melt backflow, it is easily worn by the impact of high-pressure melt. The market unit price is 23.23-54.20 US dollars/piece, and the price for bulk purchase (more than 10 pieces) can be as low as 20 US dollars/piece.
• Melt Filter Screen: Filters impurities in raw materials, is easily blocked and damaged, and needs to be replaced frequently. The unit price of a single screen is 0.10-0.50 US dollars, and the price for 1000 pieces is as low as 0.10 US dollars/piece; the overall unit price of a quick screen changer with a screen is 100-1000 US dollars/unit.

(II) Wear Parts of Die Head System

The die head system determines the molding accuracy of plastic films/products. The wear parts include the die head body, die lip, mandrel and cooling air ring, and the price is related to processing accuracy and material finish.

(III) Wear Parts of Heating and Temperature Control System

• Die Head Body: Divided into ordinary fixed die heads and rotating die heads, which are worn due to high-temperature melt corrosion and carbon deposit cleaning. The unit price of ordinary LDPE/HDPE die heads is 500-800 US dollars/unit; the price of rotating die heads is increased to 750-3000 US dollars/unit due to complex structure. The unit price of high-precision die heads of Taiwan quality is about 500 US dollars, and the unit price of large-size die heads (diameter 90-1000mm) can reach 780-8000 US dollars/unit.
• Die Lip and Mandrel: As key molding components, surface wear will lead to uneven product thickness. The unit price of a single set of accessories is 100-500 US dollars, which needs to be accurately matched with the die head specification.
• Cooling Air Ring: Used for rapid shaping of film bubbles, the air outlet is easily blocked by dust, affecting the cooling effect. The unit price of a double-air outlet cooling air ring is 800-850 US dollars/unit, and the price of a high-precision air ring with an internal cooling system can reach more than 1000 US dollars.

The heating and temperature control system ensures stable processing temperature. The wear parts are heating coils, thermocouples and temperature controllers, which are low-value accessories that need to be replaced frequently.

(IV) Wear Parts of Traction and Winding System

The traction and winding system is responsible for the stable transportation and winding of products. The wear parts are traction rollers, friction rings and accessories of deviation correction devices.

• Heating Coil: Divided into resistance heating coils and infrared heating tubes, which are prone to open circuits and aging after long-term high-temperature work. The unit price of ordinary resistance heating coils is 15-50 US dollars/piece; the unit price of 2000W infrared quartz heating tubes is 15.49 US dollars/piece, with a minimum order of 10 pieces.
• Thermocouple (Temperature Sensor): Used for temperature detection, which is easily damaged by high-temperature oxidation and mechanical vibration. The unit price of 3m/4m specifications is 20-50 US dollars/piece, and the service life is 1-2 years.
• Temperature Controller/Torque Controller: Electrical components are prone to contact oxidation and program failures after long-term work. The unit price of LJ KY-III 20A torque controller is 62-65 US dollars/unit; the unit price of ordinary temperature control instruments is 30-100 US dollars/unit.

(V) Wear Parts of Pneumatic Auxiliary System

The pneumatic system provides power for die head opening and closing and traction braking. The wear parts are sealing rings, cylinders and solenoid valves, most of which are standard parts with relatively low prices.

• Traction Roller Friction Sleeve/Friction Ring: Drives product transportation by friction, and long-term friction leads to low surface roughness. The unit price of key-style friction rings is 50 US dollars/piece; the unit price of traction roller rubber sleeves is 18-45 US dollars/piece.
• Automatic Deviation Correction Sensor: Ensures neat winding, which is prone to failures due to vibration and dust, with a unit price of 100-300 US dollars/piece.
• Winding Tension Controller: Controls the winding force, and electrical components are prone to aging, with a unit price of 80-200 US dollars/unit.

II. Analysis of Price-Influencing Factors

Through sorting out market quotations, the price difference of wear parts of extrusion blow molding machines is mainly affected by the following four factors:

(I) Material and Process Level

Material is the core factor determining the price. For example, the price of bimetallic alloy screw and barrel is 2-5 times higher than that of ordinary nitrided steel products because it adopts plasma spraying technology, which has higher surface hardness and better wear resistance; when die head parts adopt precision processing technology (such as mirror polishing), the price is 30%-50% higher than that of ordinary processed products. For parts used in high-temperature working conditions (such as heating coils and thermocouples), the price of products made of high-temperature resistant materials (quartz, high-temperature alloy) is also significantly higher than that of ordinary materials.

• Sealing Ring/Oil Seal: Easily aging and deformed under high-temperature and high-pressure environments, it is the most frequently replaced part. The unit price is 0.50-10 US dollars/piece, and the price for 100 pieces is as low as 0.10 US dollars/piece.
• Cylinder: Wear of internal piston seals leads to air leakage, with a unit price of about 500 US dollars/unit; the unit price of small solenoid valves is 20-50 US dollars/piece.
• Air Filter Element: Filters impurities in compressed air, is easily blocked, with a unit price of 10-30 US dollars/piece.

(II) Specification and Customization Requirements

The larger the part specification, the higher the price. Taking the screw and barrel as an example, the unit price of small-size assemblies with a diameter of less than 50mm is 300-800 US dollars, while the unit price of large-size assemblies with a diameter of more than 80mm can reach 1000-8000 US dollars; customized parts (such as special specification die heads and non-standard screws) need to re-open molds or adjust processing processes, so the price is 50%-100% higher than that of standard parts, and the minimum order quantity is also higher (usually more than 10 pieces).

(III) Brand and Origin

The price of imported brands (such as Germany and Taiwan region) parts is 2-3 times higher than that of Chinese parts. For example, the unit price of die heads of Taiwan quality is 500 US dollars, while the unit price of Chinese die heads of the same specification is 300-400 US dollars; the unit price of German bimetallic alloy screw and barrel can reach 2000-5000 US dollars/set, far exceeding that of similar Chinese products of 571-2571 US dollars/set. Among Chinese parts, the price of products from well-known Chinese manufacturers (such as Zhoushan Screw) is 10%-20% higher than that of small factories, but the quality stability is more guaranteed.

(IV) Purchase Quantity and Purchase Channel

Bulk purchase can significantly reduce the unit price. For example, the price of buying 1 torque controller is 65 US dollars, and the unit price can be reduced to 62 US dollars for an order of 10 pieces; the price of 1000 filter screens is 0.10 US dollars/piece, which is much lower than the retail price of 0.50 US dollars/piece. In addition, purchasing directly from manufacturers is 10%-15% cheaper than purchasing through intermediaries, and some manufacturers also provide annual free accessory quotas of 500 US dollars for long-term cooperative customers.

III. Price Summary and Procurement Suggestions

The price range of wear parts of extrusion blow molding machines is relatively large, ranging from 0.10 US dollars for filter screens to 8000 US dollars for large screw assemblies, which can be divided into three cost ranges: low-value and high-frequency replacement parts (0.10-50 US dollars, such as sealing rings, filter screens, heating coils), medium-value regular replacement parts (50-1000 US dollars, such as die heads, air rings, cylinders), and high-value core replacement parts (1000-8000 US dollars, such as screw and barrel assemblies). In the enterprise’s maintenance costs, high-value core parts account for 60%-70%, but the replacement frequency is low (once every 1-3 years); low-value parts have a high replacement frequency (monthly/quarterly), and the annual cumulative cost also needs to be taken seriously.

Based on the price analysis, the following procurement suggestions are put forward: 1) For core parts (screw and barrel, die head), priority should be given to well-known brand products made of bimetallic alloy materials. Although the initial procurement cost is high, the service life is extended by 2-3 times, which is more economical in the long run; 2) Low-value standard parts (sealing rings, filter screens) can be stored in bulk, and the unit price can be reduced by direct procurement from manufacturers; 3) For non-core parts, cost-effective Chinese standard parts can be selected to reduce maintenance costs; 4) Establish a part replacement account, and purchase in advance according to the wear cycle to avoid shutdown losses caused by part shortages.

Note: The price data in this article is sourced from the public quotations of major industrial procurement platforms from 2025 to 2026. The actual procurement price may be adjusted due to factors such as market supply and demand, exchange rate fluctuations, and cooperation terms. It is recommended to confirm the latest quotation with the supplier before procurement.