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  • TPE raw material injection molding skills

    Discussion in 'Plastic moulding' started by MIA WANG, Sep 14, 2021.

    1. MIA WANG

      MIA WANG Member

      Sep 2021
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      TPE raw material injection molding skills

      1. If the surface of TPE raw material is strictly required, it must be dried before injection.

      Generally, it is hopper drying at 70~80℃/2h or tray drying at 80~100℃/1h. For tray drying, it should be noted that the thickness of the material layer generally does not exceed 50mm. It is recommended to use trays for drying. If there is blistering on the surface of the injection-molded strip, or if the strip is cut and there are cavities inside, or the surface of the product is found to be scattered like silver wires, it can be clear that the TPE raw material contains too much water.

      2. Try to use low temperature injection molding.

      On the premise of ensuring the plasticization quality of TPE raw materials, reduce the extrusion temperature as much as possible, and increase the injection pressure and screw speed to reduce the melt viscosity to achieve the purpose of improving fluidity. When the surface of the material strip injected from the nozzle is smooth, and there is a bright light, it can be known that the plasticization quality is good. If the strip injected from the nozzle is very bright, it can be known that the temperature of the barrel can be lowered. Try to use low-temperature injection molding as much as possible to reduce cooling time and improve customer production efficiency.

      3. Upper parabola temperature setting.

      The temperature in the middle area of the screw is very high, the feeding section is slightly lower, and the nozzle is slightly lower. Typical temperature settings are 150~170°C (feeding), 170~180°C (middle), 190~200°C (front), and 180°C (nozzle). This temperature setting is only used as reference data, and the specific temperature can be adjusted appropriately according to the specific physical properties of different TPE raw materials. If you find that the TPE raw material content is bulging (the gas is inside), and the gate is easy to break during demolding, you can refer to the second trick to make adjustments.

      4. The holding pressure is as small as possible.

      Generally, the holding pressure is smaller than the injection pressure. The holding time can be selected by weighing the product. The weight of the TPE raw material no longer increases, or the shrinkage mark accepted by the customer. If it is found that the gate is easy to break during demolding, and the second trick is not effective, it should be feasible to reduce the holding pressure.

      5. If it is a few-level injection, the speed is from slow to fast.

      Because of this, the gas inside the mold is easily discharged. If there is gas inside the TPE raw material (internal bulging), or there are dents, the second trick is invalid, and this method can be used to adjust.

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