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Practical answers to common plastic material challenges

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Q

GPPS Obvious Weld Lines

A

Weld line management of transparent parts should take both appearance and strength into account; design avoidance takes priority over process remedies.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Processing Machinery PS;GPPS;weld line;transparent;gate;strength

Q

GPPS Transparent Part Flow Marks

A

Flow marks reflect front temperature management problems; PS has good fluidity, and increasing temperature and speed can improve it.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding PS;GPPS;flow mark;front;temperature;speed

Q

GPPS Transparent Part Bubbles

A

GPPS bubbles are identified by three sources: moisture, degradation and vacuum bubbles; location and accompanying features can distinguish the types.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Material Drying PS;GPPS;bubble;drying;degradation;vacuum bubble

Q

GPPS Internal Stress Delayed Cracking

A

The troubleshooting framework for delayed cracking is the three elements of internal stress, external stress and strength; polarization and heat distortion tests are two practical stress detection methods.; after confirming effectiveness, fix the parameters and practices into the work instruction...

Material Analysis PS;GPPS;delayed cracking;internal stress;polarization;detection

Q

GPPS Stress Whitening

A

Stress whitening is the apparent manifestation of the PS craze mechanism; low-stress design of structure and process is the core of prevention.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molding Process PS;GPPS;stress whitening;craze;ejection;snap-fit

Q

GPPS Product Brittle Cracking

A

GPPS brittle cracking should be investigated along two lines: material degradation and internal stress; transparent parts can use polarizers to observe stress distribution to assist positioning.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent...

Molds & Tooling PS;GPPS;brittle cracking;degradation;internal stress;weld line

Q

PP Thin-Wall High-Speed Part Defects

A

PP ultra-thin-wall high speed is an extreme process, precise control of pressure and speed; 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 problems...

Processing Machinery thin wallhigh speedflashMFI

Q

PP Transparent Part Haze

A

For PP transparent part haze check crystallization, nucleating agent is the key; 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 problems in the future

Processing Machinery transparencyhazenucleating agentcrystallization

Q

PP EPP Foaming Defects

A

EPP foaming depends on the steam process, bead fusion determines strength; 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 problems in the future

Processing Machinery EPPfoamingsteambeads

Q

PP Surface Hardness Scratch

A

PP fears scratching, protective coating plus hard fillers; 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 problems in the future

Processing Machinery scratchhardnesscoatingfiller

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