What are the common problems of pet preforms?

What are the common problems of pet preforms?



What are the common problems of pet preforms?

Powerjet Group introduces these issues to you below:

1. Poor transparency of pet preform
Reasons: The heating temperature is too high; the heating time is too long; the compressed air contains moisture; the injection molding embryo tube itself is not transparent; the embryo tube design is not suitable; the inflation ratio is too small, etc.

2. The pet preform appears white
Reason: The heating temperature is too low; the wall thickness of the embryo tube is uneven; the thickness of the embryo tube is too thick, and the heating and penetration is insufficient.

3. The position of the bottom nozzle of the pet preform is offset
Reasons: The time to start blowing is too early; the stretch rod does not go down to the bottom; the stretch rod and the center line of the bottle shaft are offset; the wall thickness of the embryo tube is uneven or the injection density is uneven; the heating is uneven.

4. Uneven wall thickness of pet preform
Reasons: The position of the stretching rod is not in the center of the embryo tube; the blowing hole is asymmetric; the stretching ratio is too low or the inflation ratio is too small; the embryo tube does not rotate in the heating furnace; the wall thickness of the embryo tube is uneven or the injection density is uneven.


 

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