We are producing PETCosmetic plastic bottlesThe process will often appear in the bottle with bubbles, these bubbles will directly lead to the failure of the quality control, so what are the causes of bubbles? Let's analyze it from several aspects.

First, process factors:

1, the speed is too fast, so that the molten plastic is subjected to large shear effect and decomposition, resulting in gas.

2, the local cooling of the product is too fast, the contraction is uneven, especially when the wall thickness of the product is large, the surface of the cooling rate is faster than the center part, in the cooling process, the center part of the plastic side of the shrinkage of the plastic side of the expansion of the exterior, so that the center part of the filling is insufficient, the formation of vacuum bubble.

3、Insufficient pressure and holding pressure, so that the melt and cavity surface is not tight, not conducive to the discharge of air.

4, insufficient back pressure, back pressure controls the screw back speed, back pressure is small, the screw back speed will be fast, easy to produce insufficient feed, the material into the air is more, too late to discharge from the feed port, resulting in a large number of air bubbles.

Second, material factors

1. The ingredients have moisture.

2. Mold factors

3. Mold trapped air, should maintain the mold or increase the exhaust slot.

So you must pay attention to these aspects in the production process to produce the perfect bottle. Yu plastic packaging in the production of pet injection molding plastic bottles have many years of experience, in the years of data support, Yu plastic packaging of pet plastic bottles qualified rate batch 99.6% or more, if you want to produce cosmetic plastic bottles, welcome to consult with the field inspection of the factory.