Common faults and solutions for PET bottle blowing-part 3

January 06, 2022

Q11. Thermo flask

Reason:

The bottle is overheated, causing recrystallization inside or outside the preform, causing bottle burst

Solutions:

1. Stretching time is too long

2. Lower the position of the cooling plate

Q12. the section weight is uneven (the neck is too heavy)

Reason:

The stretching rod gradually becomes colder when stretched from bottom to top, the material is very thin, and the cooling speeds up

Solutions:

1. Adjust the position of the hot spot to solve the main body of the preform

2. adjust the position of the cooling plate

Q13. bottom eccentric

Reasons:

1. Conveying and aligning problems

2. The back door is not in agreement with the bottle

Solutions:

1. Adjust the conveying and alignment of the Preform Mold

2. The tension rod pressure setting is too low

3. Blowing 1 pressure is too high and too early

4. Stretch rod cushion setting is inappropriate.

Q14. pearlescent-foot hair

Reason:

The root cause is cold bottles. The direct result of stretching exceeding the natural stretching limit is actually the onlooker structure of the bottle being stretched tear, the tear point formed becomes visible pearl after reflection.

Solutions:

1. Ensure that the bottom of the bottle is in the center.

2. Reduce the speed of the Bottle Blowing Machine.

3. Blowing 1 is too late to enter the air, and the stretch rod is in contact with the preform for too long.

Q15. the bottom gap is out of tolerance

Reason:

Exceeding the natural stretch limit

Solution:

1. Strengthen the heat dissipation to the bottom of the bottle

2. Heat and cool the whole preform, and raise different temperatures from around the sides

3.to ensure the normal circulation of mold cooling water

The above is the Common faults and solutions for PET bottle blowing-part 3 we have listed for you. You can submit the following form to obtain more industry information we provide for you.

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