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.
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.
