PE, PP, PS, PET, PVC sheet extruder screw barrel

The fiercely competitive plastic sheet market places higher demands on the output and performance of our extrusion equipment.

JED is committed to the research and development of extrusion technology, developing high-standard screw products that meet current market demands. With over 20 years of experience and advanced technology in professional barrel and screw production, JED can help you stand out in the fierce market competition.

PC, PMMA, PET, optical film, refractive film, etc.

PE, PP, PS, PET, PVC blister, folding box, food packaging, etc.

XPS, XPE, EPE, EPS foam board, insulation board, etc.

Other: EVA, TPU, PVB, EVOH board field

The sheet extruder screw is a core component of plastic sheet production equipment. Its design directly affects the plasticization of the material and the quality of the finished product. The following is a summary of key information:

1. Screw Structure and Function

（1）Three-Stage Design

• Feeding Section (Conveying Section): Equally spaced and equal-depth screw threads are responsible for material conveying.
• Compression Section (Transfer Section): The screw grooves feature a gradually varying depth, achieving material compression and melting.
• Homogenizing Section (Metering Section): Equally spaced shallow grooves ensure uniform melt extrusion.
• Some models utilize a twin-screw design, which enhances mixing efficiency through counter-rotation and is suitable for high-viscosity materials (such as TPE and EVA).

（2）Material and Processing:

• Commonly used is 38CrMoAlA nitrided steel, which is wear-resistant and corrosion-resistant. Some models feature a dual-alloy surface treatment for extended life.
• Conical twin-screw designs (such as those used in PE sheet extruders) forcefully extrude powders, reducing the risk of material decomposition.
  

2. Technical Parameters and Model Selection

• Compression Ratio: 3-4:1 is recommended for polyolefins (such as PP and PE) and amorphous materials (such as ABS).
• Temperature Control: The mold temperature must be 5-10°C higher than the barrel temperature. The working surface roughness of the three rollers must be ≤0.2μm to ensure sheet surface quality.
• Application Scenarios:Single-screw extruders are suitable for conventional sheet materials (such as PP and PS). Twin-screw extruders are suitable for high-performance compounding (e.g., EVA automotive interior parts and PLA, a biodegradable material).

3. Maintenance Tips

• Regularly check the screw for wear and avoid scratching the roller surface with hard objects.
• When cleaning, use copper tools to prevent scratching the nitrided surface.