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Q

Pitting and white haze inside PET bottles (unclean air source)

A

Bottle interior contamination points directly to compressed air quality; food-grade bottle blowing requires a clean air source, and the inspection and replacement cycle of the filtration system must be included in the daily maintenance plan.; after confirming effectiveness, solidify the parameter...

Material Drying PET；bottle blowing；pits；white haze；compressed air；filtration

Q

PET Bottle Bottom Crater-Shaped Bulge

A

The crater bulge is a manifestation of mismatch between bottom temperature and blowing timing; adjusting the heating curve and pre-blow timing can improve it, and standing stability needs to be verified after machine adjustment.; after confirming effectiveness, solidify the parameters and practic...

Blow Molding PET; bottle blowing; crater; bottle bottom; bulge; blowing timing

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 Bottle Body White Haze (Hydrolysis Type)

A

Hydrolysis-type white haze is often accompanied by embrittlement and is a material defect rather than a pure process problem; controlling moisture from the preform storage stage is the most economical, and damped preforms are not recommended to go online directly.

Material Drying PET; bottle blowing; white haze; hydrolysis; damped; storage

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 Gate Stringing

A

Gate stringing directly affects bottle bottom strength and may cause leakage; temperature control and cooling matching are the key, stringing preforms should be rejected and must not flow into the blowing process with defects.

Injection Molding PET; preform; gate; stringing; bottle bottom; leakage

Q

PET Preform Surface Scratches

A

Scratches are divided into random and repeated types, and repeated scratches must point to mold or guide rail problems; the responsible part can be quickly located according to the scratch distribution pattern, and timely repair avoids batch defects.

Molds & Tooling PET; preform; scratch; mold; guide rail; appearance

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 Neck White Spot Crystallization

A

Neck white spots reflect improper filling speed or temperature management; the neck no longer deforms in the blowing process, and defects from the injection stage are retained as-is, so they must be controlled at the source.

Injection Molding PET; preform; bottle neck; white spot; crystallization; injection speed

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전체 주제 11636 Material Drying 1439 Injection Molding 1506 Molding Process 740 Molds & Tooling 1506 Processing Machinery 2025 Extrusion & Post 2239 Blow Molding 315 Thermoforming 141 Material Analysis 1343 Production & Quality 382