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        • 幾種實用的TPE/TPR注塑工藝訣竅
        • 本站編輯:杭州紅博新材料有限公司發布日期:2021-01-23 09:54 瀏覽次數:

        一、制品表面如要求嚴格,注塑前必須干燥。一般為料斗式干燥70~80℃/2h或托盤干燥80~100℃/1h。對于托盤干燥,應注意料層厚度一般不超過50mm為佳。推薦采用托盤干燥。若注塑出的料條表面有起泡,或切開料條,發現里面有空洞,或發現制品表面又散射狀銀絲,就可確定TPE/TPR原料含水分過多。

        1、 If the product surface is strict, it must be dry before injection. Generally hopper drying 70 ~ 80 ℃ / 2H or tray drying 80 ~ 100 ℃ / 1H. For tray drying, it should be noted that the thickness of material layer is generally not more than 50 mm. Tray drying is recommended. If there are blisters on the surface of the injection molding strip, or if the strip is cut open, and it is found that there are cavities in the strip, or if there are scattered silver wires on the surface of the product, it can be determined that the TPE / TPR raw material contains too much water.

        二、盡量采用低溫注塑。在保證塑化質量的前提下,盡量降低擠出溫度,并且利用提高注射壓力及螺桿轉速來降低熔體粘度,達到提高流動性的目的。當從噴嘴注射出來的料條表面光滑,還捎帶亮光,就可確定塑化質量不錯。如果從噴嘴注射出來的料條非常亮,就可確定料筒溫度還可降低。盡量的采用低溫注塑,可減少冷卻時間,從而提高客戶生產效率。

        2、 Try to use low temperature injection molding. On the premise of ensuring the plasticizing quality, the extrusion temperature should be reduced as much as possible, and the melt viscosity should be reduced by increasing the injection pressure and screw speed, so as to improve the fluidity. When the surface of the strip injected from the nozzle is smooth and bright, it can be determined that the plasticizing 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 molding, can reduce the cooling time, so as to improve customer production efficiency.2-1PP9164230.png

        三、上拋物線溫度設置。螺桿中間區溫度最高,加料段稍低,噴嘴稍低。典型的溫度設置為150~170℃(喂料),170~180℃(中部),190~200℃(前部),180℃(噴嘴)。此溫度設置只是作為參考數據,具體的溫度可根據不同TPE,TPR材料的具體物性適當調整。如發現制品內容鼓起(氣體包在里面),脫模時澆口易斷裂,可參照訣竅二做調整。

        3、 Upper parabola temperature setting. The temperature in the middle zone of screw is the highest, the feeding section is slightly lower, and the nozzle is slightly lower. Typical temperature settings are 150-170 ℃ (feed), 170-180 ℃ (middle), 190-200 ℃ (front), 180 ℃ (nozzle). This temperature setting is only used as reference data. The specific temperature can be adjusted according to the specific physical properties of different TPE and TPR materials. If it is found that the contents of the product bulge (gas package inside) and the gate is easy to break when demoulding, it can be adjusted according to the second trick.

        四、保壓壓力盡可能小。一般保壓壓力要比注射壓力要小,保壓時間的確定可通過稱量制品,以制品重量不再增加為準,或者以客戶接受的收縮痕為準。如果發現脫模時澆口易斷裂,用訣竅二無法奏效,那降低保壓壓力應該可行。

        4、 Keep the pressure as low as possible. Generally, the holding pressure is smaller than the injection pressure, and the holding time can be determined by weighing the product, with the weight of the product no longer increasing, or with the shrinkage mark accepted by the customer. If it is found that the gate is easy to break during demoulding, and the second trick can not work, it should be feasible to reduce the packing pressure.

        五、如果是幾級注射,速度由慢到快。因為這樣,模具內部氣體容易排出。如果制品內部有氣體包?。▋炔抗钠穑?,或者有凹痕,用訣竅二無效,可采用此方法調整。

        5、 If it's a few injections, the speed is from slow to fast. Because of this, the gas inside the mold is easily discharged. If there is gas in the product (internal bulge), or there is a dent, the second trick is invalid, this method can be used to adjust.


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