5 practical points of TPE/TPR injection molding process

  • Time of issue:2021-10-22
  • Views:565

5 practical points of TPE/TPR injection molding process

  • Categories:Industry News
  • Author:SPP
  • Origin:www.sptpe.cn
  • Time of issue:2021-10-22
  • Views:565

 I. If the surface of the product is strict, it must be dried before injection. Generally, the hopper drying is 70~80℃/2h or pallet drying is 80~100℃/1h. For pallet drying, it should be noted that the thickness of material layer is generally not more than 50mm. It is recommended to use tray drying. If there is blistering on the surface of the injection molded strip, or cut open the strip and find that there is a hole 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. Under 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 strip injected from the nozzle is smooth and shiny, 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. If you try to use low temperature injection, you can reduce the cooling time and improve the production efficiency of customers.

  III. Upper parabolic temperature setting. The temperature is highest in the middle zone of the screw, slightly lower in the charging section and slightly lower in the nozzle. 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 and TPR materials. If you find that the content of the product bulges (gas is wrapped inside) and the gate is easy to break when demoulding, you can refer to trick two to make adjustments.

  IV. Keep the pressure as small as possible. Generally speaking, the holding pressure should be lower than the injection pressure, and the holding time can be determined by weighing the product, and the weight of the product should not increase, or the shrinkage mark accepted by the customer should be used. If it is found that the gate is easy to break during demoulding and the trick 2 does not work, then it should be feasible to reduce the holding pressure.

  V. In case of several stages 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 (bulging inside) or there is a dent, this method can be used to adjust the product if trick 2 does not work.

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