Problem & Solution

Practical answers to common plastic material challenges

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Q

PET bottle drop pinhole leakage

A

Pinholes originate from defects inside the preform being magnified by stretching; drying and impurity removal are the fundamental prevention, and the leak detection process is indispensable for pressurized products such as carbonated beverages.; after confirming effectiveness, solidify the parame...

Extrusion & Post PET；bottle；pinhole；leakage；bubbles；stretching

Q

PET bottle stress cracking

A

Stress cracking is strongly related to molecular weight and residual stress; controlling IV retention and uniform stretching is fundamental, and special grades need to be selected and verified for applications in contact with chemicals.; after confirming effectiveness, solidify the parameters and...

Extrusion & Post PET；bottle；stress cracking；IV；residual stress；environment

Q

PET bottles too soft with insufficient strength

A

A bottle being too soft requires distinguishing a design problem from a process problem; low-temperature molding to increase orientation is an effective means of improving rigidity, but the whitening risk must be taken into account for comprehensive balance.; after confirming effectiveness, solid...

Extrusion & Post PET；bottle blowing；too soft；rigidity；orientation；bottle design

Q

PET Bottle Uneven Wall Thickness Distribution

A

Wall thickness distribution is the core indicator of PET bottle quality; eccentric preforms and uneven heating are the main causes, and online thickness measurement or slice sampling inspection is recommended to monitor distribution trends.; after confirming effectiveness, solidify the parameters...

Extrusion & Post PET; bottle blowing; wall thickness; distribution; eccentric; stretching

Q

PET Bottle Insufficient Vertical Load Capacity

A

Top load strength is jointly determined by wall thickness distribution, orientation degree and bottle type; load problems require reviewing the preform and heating process, and if necessary, structural optimization is used to improve stacking safety.

Extrusion & Post PET; bottle blowing; top load; load bearing; wall thickness; orientation

Q

PET Blowing Milky White Whitening (Overheated Crystallization)

A

Milky white whitening is caused by overheated crystallization, and its machine adjustment direction is opposite to that of pearlescent whitening, so they must be accurately distinguished first; thermal imager monitoring of heating uniformity is an effective preventive means.

Extrusion & Post PET; bottle blowing; milky white; crystallization; overheating; heating zone

Q

PET Preform Color Streaks

A

The root cause of color streaks lies in dispersion and temperature uniformity; transparent colored products are appearance-sensitive, and streaks should be eliminated through homogenization process and temperature control, and if necessary, replace with a color masterbatch with good dispersibility.

Extrusion & Post PET; preform; color streak; color masterbatch; dispersion; hot runner

Q

PET Preform Black Speck Impurities

A

Black specks mostly originate from equipment cleanliness and thermal management problems; black-specked preforms cause weak points and poor appearance of the bottle body, so a regular machine cleaning system should be established and the effect of each cleaning recorded.

Extrusion & Post PET; preform; black speck; carbonization; hot runner; cleaning

Q

PET Sheet Winding Problem

A

Winding = thickness + tension.

Extrusion & Post PET; sheet; winding; wrinkles; tension

Q

PET Bottle Bottom Material Accumulation (Thick Bottom)

A

Thick bottom = too much heat at the bottom, the rod not in place.

Extrusion & Post PET; bottle blowing; thick bottom; lamp zone; stretch rod

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