Problem & Solution

Practical answers to common plastic material challenges

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Q

GPPS Product Deformation from Insufficient Heat Resistance

A

GPPS heat resistance is limited; application matching is the basic principle of material selection.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar...

Processing Machinery PS;GPPS;heat resistance;deformation;heat distortion temperature;material selection

Q

GPPS Regrind Use Discoloration

A

The discoloration and embrittlement problem of PS regrind is prominent; transparent products are recommended to use all virgin material.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Processing Machinery PS;GPPS;regrind;discoloration;embrittlement;degradation

Q

GPPS Product Black Specks

A

Black specks point to equipment cleaning and material management; regular purging is a preventive system.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for s...

Processing Machinery PS;GPPS;black speck;carbonization;cleaning;contamination

Q

GPPS Product Poor Surface Gloss

A

Transparent part gloss depends on mold surface and replication quality; mirror polishing is a basic investment.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PS;GPPS;gloss;haze;polishing;mold temperature

Q

GPPS Product Flash

A

Flash treatment should distinguish between two types of causes: insufficient clamping and mold wear.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for simila...

Molds & Tooling PS;GPPS;flash;clamping force;parting line;wear

Q

GPPS Product Short Shot

A

Short shot is investigated from three paths: pressure, temperature and runner; pay attention to the thermal stability boundary of PS when raising temperature.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding PS;GPPS;short shot;pressure;temperature;runner

Q

GPPS Product Sink Marks

A

GPPS sink marks follow the feeding mechanism; structural uniformity is the fundamental solution.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar pr...

Molds & Tooling PS;GPPS;sink mark;holding pressure;wall thickness;coring out

Q

GPPS Product Deformation and Warpage

A

The main causes of warpage of non-crystalline materials are orientation stress and uneven cooling; mild process is the prevention direction.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PS;GPPS;warpage;cooling;orientation;holding pressure

Q

GPPS Product Ejector Whitening and Cracking

A

The ejection system of brittle materials should be designed to higher standards; dispersing ejection force is the basic principle.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PS;GPPS;ejector whitening;ejector cracking;ejection;draft

Q

GPPS Product Silver Streaks

A

Silver streaks distinguish two sources: moisture and degradation; if drying is ineffective, turn to temperature troubleshooting.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post PS;GPPS;silver streak;moisture;degradation;shear

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All Topics 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