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TPE build-up
The problem of TPE build-up at the extruding gate during the extrusion process is usually caused by various factors. The following are some possible solutions:
1. Control extrusion conditions
Adjust temperature:
Ensure that the temperature setting of the extruder is reasonable to avoid overheating, decomposition, or carbonization of the material during extrusion, thereby reducing the generation of material accumulation.
Adjusting the screw speed:
Appropriate screw speed helps to achieve uniform mixing and shearing of materials in the extruder, reducing the TPE build-up caused by uneven distribution.
2.Optimize material handling
Dry material:
Ensure that TPE material has been thoroughly dried before extrusion, removing moisture and dampness from it. Undried materials are prone to foaming during extrusion, increasing the risk of TPE build-up.
Choosing the appropriate filter:
Using a fine mesh filter can improve plasticization efficiency, reduce impurities and incompletely melted materials entering the extrusion mold, thereby reducing the possibility of TPE build-up.
3.Improve mold design
Optimize mold structure:
Check and optimize the design of the mold to ensure smooth flow channels and reduce material retention and accumulation in the mold.
Using Teflon coating:
Apply anti sticking materials such as Teflon to the mouth of the mold to reduce material adhesion on the mold surface and reduce the formation of TPE build-up.
4.Regular maintenance and cleaning
Cleaning the mold:
Regularly clean the mouth part of the mold, remove accumulated material and dirt, and keep the mold clean and smooth.
Check and replace worn parts:
Regularly inspect the wear of screws, barrels, and other components of the extruder, and replace severely worn parts in a timely manner to ensure the stability and reliability of the extrusion process.
5.Using silicone additives
Add high molecular weight additives such as silicone additives (silicone powder, silicone masterbatch), which can withstand high temperatures, reduce material carbonization and accumulation at the mold mouth, improve plastic processing fluidity and demolding properties, and enhance product surface glossiness.
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6.Other precautions
Avoid using damp materials:
Damp TPE materials are prone to foaming and surface roughness during extrusion, increasing the risk of TPE build-up.
Check equipment status:
Ensure that the extruder and other related equipment are in good working condition to avoid unstable extrusion and material accumulation problems caused by equipment failures.
Solving the problem of TPE build-up requires multiple approaches, including controlling extrusion conditions, optimizing material handling, improving mold design, regular maintenance and cleaning, and using silicone additives. Through the comprehensive application of these measures, the occurrence of material accumulation can be effectively reduced, and the quality and production efficiency of extruded parts can be improved.