Blow molding products are widely used in all walks of life, containers, films, beverage bottles, toys... can be said to have been integrated into our lives. A summary of the quality problems that are prone to blow molding products for discussion:
1. The longitudinal wall thickness of the blow molded product is not uniform:
Causes: 1 The bottle of the pet bottle has a serious drooping effect. 2 The longitudinal cross-sectional diameter of the blow molded product is too different.
2. The lateral wall thickness of the blow molded products is uneven:
Causes: 1 Pet Bottle Preform extrusion skew 2 mold sleeve and the core inside and outside the temperature difference is large 3 product shape asymmetry 4 pet bottle preform inflation ratio is too large
3. The orange peel pattern or pitting on the surface of the blow molded product:
Causes: 1 The mold is poorly ventilated. 2 The mold leaks or the mold cavity is condensed. 3. The pet bottle preform is poorly plasticized, and the pet bottle preform has melt fracture. 4 The inflation pressure is insufficient.
5 inflation speed is slow 6 inflation ratio is too small
4, the volume of blow molding products is reduced:
Causes: 1 The wall thickness of the pet bottle preform increases, which leads to the thickening of the product wall. 2 The shrinkage rate of the product increases, resulting in a shrinkage of the product size. The inflation pressure is small, and the product is not inflated to the cavity design size.
5, blow molding products product outline or graphic is not clear:
Causes: 1 cavity exhaust failure 2 inflation pressure is low 3 pet bottle preform melt temperature is low, material plasticization is poor 4 mold cooling temperature is low, the mold has 'condensation' phenomenon
6. Blow molding products black spots or black lines:
Cause: 1 The residence time in the barrel is too long. 2 The molten material is retained in the blown barrel or in the nozzle flow path. There are foreign objects in the 3 blown barrel. 4 The electric heating ring is loose or weak or electrically unstable, which causes the material to be degraded. 5 imperfect nozzle blocked the nozzle. 6 improper blow molding conditions. The blown barrel has cracks or screw depressions. The beer machine parts are short of oil. 7 raw materials are contaminated
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