How to solve the problem of bubbles generated during PET plastic bottle preform injection molding?
Bubbles are one of the common defects in PET plastic bottle preform injection molding processing, and their appearance may affect product quality and use effects.Bubbles are one of the common defects in PET plastic bottle preform injection molding processing, and their appearance may affect product quality and use effects.
How to solve the problem of bubbles generated during PET plastic bottle preform injection molding?
Bubbles are one of the common defects in PET plastic bottle preform injection molding processing, and their appearance may affect product quality and use effects.
The following are 5 methods to solve the problem of air bubbles produced in PET plastic bottle preform injection molding processing:
1. Change raw materials
The occurrence of bubbles may be related to the raw materials. If the raw materials are impure or contain other impurities, it may lead to the generation of bubbles. In order to solve this problem, you can consider replacing the raw materials to ensure that their purity and physical properties meet the requirements.
2. Adjust processing parameters
Adjusting processing parameters is also an effective way to solve bubble defects. Increasing injection pressure, increasing injection speed, increasing cooling time, etc. may all improve the bubble problem. In addition, attention should be paid to controlling the temperature of the material to avoid overheating or coldness.
3. Optimize mold structure
Mold structure may also contribute to the appearance of air bubbles. If the mold is not designed properly, the molten polyester will be blocked during injection, causing bubbles to form. Therefore, the structure of the mold needs to be re-optimized to ensure that the molten polyester can be completely filled into the mold to avoid the occurrence of bubbles.
4. Add defoaming agent
Defoaming agents are added to polyester to effectively prevent bubble defects. Defoaming agents have good defoaming properties and can discharge air and other gases during the injection molding process to avoid the generation of bubbles. However, it is necessary to select the appropriate defoaming agent and control its usage to avoid affecting product performance.
5. Perform post-processing
If none of the above methods can effectively solve the bubble problem, post-processing can be considered. If you want to remove bubbles on the surface, you need to use tools such as grinding and polishing to ensure that the surface of the product is smooth and smooth. However, the cost of post-processing is relatively high and will also affect production efficiency.
To sum up, bubbles are generated during the injection molding of PET plastic bottle preforms, and different solutions need to be adopted according to the actual situation. Identifying the causes of bubbles and making corresponding adjustments can effectively improve product quality and production efficiency.