1 Plastic hook shrinkage, because the product is thicker difficult to cool, (exterior cooling, but the internal does not cool), sometimes the interior may still be molten, so, if possible, you can change the structure of the product planning.
2. Plastic hook water, also may be the mold for this reason, the mold cooling waterway planning unreasonable, the demand from scratch.
3. Plastic hook shrinkage may be and injection molding have a certain contact, to improve the injection pressure, and after the injection to the end of the mold pressure. and give a satisfactory cooling time.