How to solve the problem of fog shadow in one side of the preform in the preform injection molding?
The following methods can be used to solve the problem of fog shadow on one side of the preform during the preform injection molding process:
1,Adjust the injection temperature
Setting the screw injection temperature too high will cause the raw materials to melt excessively or even carbonize, affecting the product quality and thus generating fog shadow. Therefore, it is necessary to appropriately reduce the injection temperature of the injection molding machine screw according to the origin and type of the PET raw material to increase the melting degree of the plastic and avoid the appearance of fog shadow.
2. Adjust the injection speed
Injection speed that is too fast will prevent the raw materials in the molten state from being fully integrated inside the preform mold, resulting in fog shadow on the surface of the products and easily damaging the preform mold. By gradually reducing the injection speed, the molten PET material can be fully integrated in the preform mold to improve the surface effect of the products.
3. Regular maintenance of injection molding equipment
The performance of injection molding equipment directly affects product quality, such as clamping force, injection volume, etc. The injection molding machine should be regularly maintained and repaired to ensure the stability of various performances of the equipment, thereby avoiding the problem of fogging caused by equipment.
4. Use high-quality PET material
The quality of PET material is also an important factor affecting haze. High-quality and stable PET material should be selected. If recycled material is mixed in production, It should be controlled within a certain proportion, and the quality and neatness of the recycled material should be guaranteed.Avoid haze caused by PET material problem.
In summary, the problem of haze on one side of the preform during the preform injection molding process can be effectively solved by adjusting the injection temperature, injection speed, regular equipment maintenance, and using high-quality PET material etc.
