What to pay attention to in TPE/TPR molding process

  • Time of issue:2022-10-31
  • Views:880

What to pay attention to in TPE/TPR molding process

  • Categories:Industry News
  • Author:SPP
  • Origin:en.tpe-sp.com
  • Time of issue:2022-10-31
  • Views:880

  I. If the surface of the product is strict, it must be dried before injection. Generally, it is 70~80℃/2h for hopper drying or 80~100℃/1h for pallet drying. for pallet drying, it should be noted that the thickness of material layer is generally not more than 50mm. It is recommended to use pallet drying. If the surface of the injection molding strip has blistering, or cut open the strip and find that there are hollows inside, or find that the surface of the product and scattered silver wire, it can be determined that the TPE/TPR raw materials contain too much moisture.

  Second, try to use low-temperature injection molding. In the premise of ensuring the quality of plasticization, try to reduce the extrusion temperature, and the use of increased injection pressure and screw speed to reduce the viscosity of the melt, to improve the purpose of fluidity. When the surface of the material injected from the nozzle is smooth and shiny, it can be determined that the plasticization quality is good. If the strip injected from the nozzle is very bright, it can be determined that the barrel temperature can be reduced. Try to use low temperature injection, can reduce the cooling time, so as to improve the customer's production efficiency.

  Third, the upper parabolic temperature setting. The middle zone of the screw has the highest temperature, the filling section is slightly lower, and the nozzle is slightly lower. Typical temperature settings are 150~170℃ (feeding), 170~180℃ (middle), 190~200℃ (front), 180℃ (nozzle). This temperature setting is only for reference, the specific temperature can be adjusted according to the specific physical properties of different TPE,TPR materials. If you find that the content of the product bulges (gas is wrapped inside) and the sprue is easy to break when demoulding, you can refer to trick two to make adjustment.

  Fourth, the holding pressure should be as small as possible. Generally, the holding pressure should be smaller than the injection pressure, and the holding time can be determined by weighing the products, subject to the weight of the products not increasing, or subject to the shrinkage marks accepted by customers. If it is found that the gate is easy to break during demoulding, and the trick two does not work, then it should be feasible to reduce the holding pressure.

  Fifth, if it is several levels of injection, the speed should be from slow to fast. Because of this, the gas inside the mold can be discharged easily. If there is gas inside the product (internal bulge) or there is a dent, this method can be used to adjust the product if trick 2 is not effective.

  
 

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