Volume reduction of blow molding products


Cause of occurrence:

①The wall thickness of parison is increases, which leads to the thickening of the wall of the product.

②The shrinkage rate of the product is increased, Resulting in smaller size of the product

③The blowing pressure is small, and the product can not achieve the size of the cavity design.

Solution measures:

①Control the installation by conditioning program to reduce the wall thickness of parison.Control the melt temperature of parison and reduce the shrinkage ratio of parison.

②Change the resin with a small shrinkage rate, the time of blowing should be prolonged and cooling temperature of the mould should be reduced.

③Properly increase the pressure of tightening the air.

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