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注塑加工中熔接痕产生的原因及措施

来源:http://www.sdlqmj.com 日期:2020-11-20 发布人:liqiang 浏览次数:
注塑加工中熔接痕产生的原因,塑料制品的熔接痕是射胶过程来自不同方向的熔融树脂在结合处未能完全融合而产生的。射胶过程中由于熔合处的两股树脂流并不会相互混合;因此温度越低,熔合痕就越明显,而且强度也会降低。
The reason of weld line in injection molding is that the fused resin from different directions is not fully fused at the joint during the injection process. The lower the temperature, the more obvious the fusion mark and the lower the strength.
相反温度越高,粘合力便会增强。熔合处粘合状况也取决于施加在该处的压力。保压越低,熔合就越差,强度也就越低。熔合是树脂的合流点,同时也可能是流动末端,塑料制品的熔接痕中,如果不在该位置很好地设置一个排气口来排出气体,则会使熔合的外观和强度恶化。
On the contrary, the higher the temperature, the stronger the adhesion. The bonding condition of the fusion also depends on the pressure applied to it. The lower the holding pressure, the worse the fusion and the lower the strength. Fusion is the confluence point of resin, and it may also be the end of flow. In the weld line of plastic products, if an exhaust port is not well set at this position to exhaust gas, the appearance and strength of fusion will be deteriorated.
济南注塑加工改善措施:
Jinan injection molding process improvement measures:
l)提高树脂温度、提高模具温度、提高注射压力及速度;加温
l) Increase the resin temperature, mold temperature, injection pressure and speed; heating
2)注意分型面的排气,在熔接痕的产生处增加镶件、顶针也有利排气。
2) Pay attention to the exhaust of parting surface. Adding inserts and thimbles at the place where weld lines are generated is also beneficial to exhaust.

3)选用合理的进胶位置,塑料制品开模前更好做模流分析;
3) It is better to do mold flow analysis for plastic products before mold opening by selecting reasonable glue feeding position;
4)增加工艺溢料排冷料,成型后再予以切断去除。
4) The process overflow and cooling material are added and cut off after forming.
5)尽量加粗缩短浇道系统,以改善走胶;
5) The runner system should be thickened and shortened as far as possible to improve the glue delivery;
6)毛面产品可以尽量选择粗的纹面,这样也有利于改善熔接痕;
6) Coarse grain surface can be selected as far as possible for rough surface products, which is also conducive to improving the weld line;
以上就是小编为大家所介绍的关于注塑加工中产生接痕的原因,希望可以帮助大家,如有更多的疑问可以点击:http://www.sdlqmj.com咨询在线客服。
The above is what Xiaobian introduced to you about the causes of joint marks in injection molding. I hope it can help you. If you have more questions, you can click: http://www.sdlqmj.com Consult online customer service.

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