Today is the last day of 2016, time is too fast, a year has passed in a twinkling of an eye. 2016 no matter you satisfied or disappointment, success and failure, 2017 will come. Dongguan Plastic mold factory today bring you New Year's day special article - dealing with plastic mold products deformation.
Deformation of the plastic mold products (warping, bending, small wrinkles) as well as the reasons of the crack. The residual internal stress in the products. Molding set conditions should be set in eliminate products of internal stress direction. Namely improve material barrel temperature and mould temperature, the material liquid get better state, the injection pressure is not too high.
In order to reduce the residual stress, can undertake annealing treatment, namely under thermal deformation temperature of 10 degrees, more than 2 hours of heating has the effect of stress relief. But this way because of the high cost of annealing and use is not common. If the mould cooling hole not to cooling homogeneity of products, also can produce residual stress, which means cooling hole can not too shallow.
Method of dealing with the deformation of plastic mold products:
1. Sufficient cooling solidification in the mould (chronograph longer cooling time), and improve the temperature of the material, reduce the injection pressure.
2. Make the mould cooling uniformity.
3. Avoid the thickness of products, set up the gate, where products large thickness caused by straight line easy to warp, make it big R curve, products reversible bending die, increase the number of ejection rod, increase the draft.
Crystalline materials (poly (PVC, polypropylene, nylon), molding shrinkage rate, and easy to cause bias, non-crystalline material (polystyrene (PVC, ABS) easy to cause the residual stress.
Use orthotics keep at room temperature after molding, to prevent deformation, slightly but not hope too much. In thin shape box forming, bending caused by molding temperature, it is common in just the thermal expansion.
Note: the above information by Jiezheng mould finishing on the Internet, welcome to reprint, indicate the source!