Frequently Asked Questions about PET Blow Molding Machine

December 28, 2021

1. Thick top and thin bottom: Delay the pre-blowing time, or reduce the pre-blowing pressure to reduce the air flow.

2. The bottom is thick and the top is thin: the opposite of the above.

3. There are wrinkles under the bottleneck: the pre-blowing is too late or the pre-blowing pressure is too low, or the blank cooling here is not good.

4. White bottom: preform is too cold; too stretched; pre-blowing too early or pre-blowing pressure is too high.

5. There is a magnifying glass at the bottom of the bottle: too much material at the bottom of the bottle; pre-blowing is too late, and the pre-blowing pressure is too low.

6. There are wrinkles in the bottom of the bottle: the bottom temperature is too high (the cooling at the gate is not good); the pre-blowing is too late, the pre-blowing pressure is too low, and the flow is too small.

7. The whole bottle is turbid (opaque): insufficient cooling.

8. Partial whitishness: Excessive stretching, the temperature here is too low, or the pre-blowing is too early, or the stretch rod is hit.

9. Eccentricity of the bottom of the bottle: It may be related to the temperature of the preform, stretching, pre-blowing, high-pressure blowing, etc. Reduce the temperature of the preform; speed up the drawing speed; check the gap between the tie rod head and the bottom mold; postpone the pre-blowing to reduce the pre-blowing pressure; postpone the high-pressure blowing; check whether the preform is eccentric.

The above is the Frequently Asked Questions about PET Blow Molding Machine we have listed for you. You can submit the following form to obtain more industry information we provide for you.

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