Causes of bubbles in plastic bottles
The plastic bottle is disturbed by gas during the filling process, and some cavities or bubbles are often formed on the surface of the product. Now let's summarize the factors related to the appearance of bubbles.
Process factors:
1. The speed is very fast, so that the molten plastic is decomposed by large shearing, and gas is generated.
2. The part of the product cools very quickly, and the shrinkage is never even. Especially when the wall thickness of the product is relatively large, the surface cooling speed is faster than the center part. During the cooling process, the plastic in the center part shrinks and expands to the outside, making the center Insufficient filling of the part, forming a vacuum bubble.