Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

PET Preform Excessive IV Value Drop

A

IV is the fundamental indicator of PET bottle mechanical properties, and hydrolysis and thermal degradation are the two main causes of IV drop; drying and temperature control work together, and IV testing should be included in daily quality control.

Material Drying PET; IV; intrinsic viscosity; hydrolysis; thermal degradation; molecular weight

Q

PET Preform Short Shot Material Shortage

A

Preform short shots are directly scrapped, and need to be quickly located from the three aspects of pressure, temperature and gate; multi-cavity molds should monitor the weight cavity by cavity to ensure filling consistency of each cavity.; after confirming effectiveness, solidify the parameters ...

Injection Molding PET; preform; short shot; material shortage; injection pressure; gate

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 Acetaldehyde AA Content Exceeding Standard

A

AA exceeding the standard is a food safety risk, and the requirements for mineral water bottles are particularly strict; temperature control and shortening residence time are the fundamental means, and headspace GC sampling must be done before filling to confirm qualification.

Molds & Tooling PET; acetaldehyde; AA; thermal degradation; odor; food safety

Q

PET Preform White Haze Crystallization (Slow Cooling)

A

White haze crystallization is an irreversible defect and must be prevented at the preform injection stage; controlling melt temperature and cooling rate is the core, and preforms with white haze should be directly scrapped.

Injection Molding PET; preform; white haze; crystallization; cooling; transparency

Q

PET Preform Bubbles (Insufficient Drying)

A

Preform bubbles are almost all related to moisture management, and qualified drying is the primary prerequisite; bubbled preforms will inevitably be stretched thin during blowing, so they should be rejected online and the drying records traced, and after confirming the measures are effective, sol...

Material Drying PET; preform; bubble; drying; moisture content; hydrolysis

Q

PET Sheet Winding Problem

A

Winding = thickness + tension.

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

Q

PET Preform Mold Eccentric Wear

A

Cavity number traceability locates the eccentricity source.

Injection Molding PET; preform; mold wear; concentricity; cavity number

Q

PET Preform Re-Moistening After Drying

A

Preventing re-moistening = the second half of drying.

Material Drying PET; drying; re-moistening; sealing; conveying

Q

PET Bottle Improper Mold Temperature

A

Mold temperature 10~15℃ is the standard window.

Molds & Tooling PET; bottle blowing; mold temperature; bottle sticking; chiller

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