Frequently asked questions about blow molding

11. Crackle pattern
Cracks on blow molded parts are commonly found near melt lines, such as blow molded inserts, column locations, or other hole locations. Their brittleness can sometimes be referred to as fracture.
Machine:
1. Effect of internal stress.
The cooling time is too short.
Mold:
1. Too much lubricant is used.
2. Insufficient or uneven etching lines.
3. Incorrect runner and gate design.
Material Science:
1. Select the wrong nozzle material.
The blow molding material is too wet.
Brewery: The blow molding cycle is inconsistent.
12. Surface fine cracks
There are very small cracks on the surface of blow molded parts, which often resemble a web but can be split like a spider web.
Machine:
The locking force of the selected beer machine is not suitable.
The cooling time is too short.
Insufficient blow molding speed or glue injection time.
4. The barrel blow molding temperature is too high.
Mold:
The water inlet is large.
2. Low mold temperature.
3. Dirty mold surface
4. The design of the pump flow passage is incorrect.
Material Science:
1. The blow molding material is contaminated.
2. Blowing plastic is too wet.
Brewery: Bad habits.