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所谓波纹,是指熔料流入模腔后出现的以浇口为中心的条纹。这是由于模腔各面熔料冷凝硬化不均匀所产生的。详细说明如下。

1、塑料粘度过大。熔料粘度过大时一接触到模腔表面很快就冷凝,后面流来的熔料迫使冷凝料继续流动,,从而产生条纹。:条纹产生的原因多数是模具温度不适当。可用改变成型条件,即提高熔料温度和模具温度来消除。

2、熔料温度不均匀

滞留在注射机喷咀头部的熔料,应与成型制件脱模时一起除掉。如有残余部分或有主浇道及浇道冷却了的冷料,被注入模腔,也同样产生波纹。一开始就注入热的熔料即可消陈波绞。注重抛光注射机喷嘴、升高喷嘴温度、模具上设计足够大的冷料穴等也可消除波纹。

3、模具温度不适宜

模具温度过低,处于低温部位的熔料就立即冷凝,因而产生波纹。虽然提高模具温度能够消除这种缺陷,但是这样必将延长成型周期。

 

 
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