Injection molded parts processing and what are the reasons of crack defects
When we are in the plastic processing, often because some small, some unnecessary defects, which caused some trouble to our injection molding processing. These defects, the most common is the crack defects, so, plastic processing what the reasons for crack defects?
1, raw material add the recycle material proportion, to make the raw material shrinkage directional or filler distribution;
2, raw material plastic pollution, volatile matter, or poor drying;
Small 3, mould design, draft, thin wall products and have sharp corners and gap, produce stress concentration;
4, the holding and gel time is short, the cooling time is too long or too short;
5, the mould temperature is low or uneven, low speed, low pressure injection;
6, improper processing conditions, stress is large and the bad;
7, demoulding agent use undeserved, products demoulding post-processing uneven cooling etc.