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PET Preform Excessive IV Value Drop

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

19 görüntüleme

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PET Preform Short Shot Material Shortage

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

16 görüntüleme

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PET Preform Black Speck Impurities

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

15 görüntüleme

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PET Acetaldehyde AA Content Exceeding Standard

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

15 görüntüleme

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PET Preform White Haze Crystallization (Slow Cooling)

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

16 görüntüleme

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PET Preform Bubbles (Insufficient Drying)

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

19 görüntüleme

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PET Sheet Winding Problem

Winding = thickness + tension.

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

15 görüntüleme

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PET Preform Mold Eccentric Wear

Cavity number traceability locates the eccentricity source.

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

16 görüntüleme

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PET Preform Re-Moistening After Drying

Preventing re-moistening = the second half of drying.

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

19 görüntüleme

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PET Bottle Improper Mold Temperature

Mold temperature 10~15℃ is the standard window.

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

15 görüntüleme

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Tüm Konular 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

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