Blow molding machine techniques and solutions: What to do when PET bottles exhibit pearlescent whitening?
For problems occurring during the blow molding process, first identify the causes and propose corresponding solutions.
Causes:
1. Insufficient heating temperature;
2. Uneven wall thickness of the preform;
3. Excessive preform wall thickness resulting in inadequate heat penetration.
Exclusion methods:
1. Increase temperature or slow down the rotation speed;
2. Improve the quality of the tube blank;
3. Reduce the thickness of the tube blank, or try raising the outer cover of the heating device to enhance heat dissipation from the surface of the tube blank.