Cause
+ Material contains less impurities and liquid flow
vents + Location was not good
+ thickness of the irrational
+ Design products too complex and leads to plastic flow has much changed, causing weld
Remedy
+ Check the original materials, using extra skin and replace the original materials
+ Change location vents
+ thickness product design reasonable
mold + Increase the heat and plastic flow
+ Design Product design must be simplified at the beginning to a good quality product
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