Problem & Solution

Practical answers to common plastic material challenges

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Q

PET Bottle Neck Crystallization (White Neck)

A

White neck = heat protection failure.

Molding Process PET; bottle neck; crystallization; shading; lamp zone

Q

PET Bottle Thin Shoulder

A

Thin shoulder = upper heat + pre-blow rhythm.

Molding Process PET; bottle blowing; thin shoulder; lamp zone; pre-blow

Q

PET Bottle White Haze (Crystallization Type)

A

White haze = overheating crystallization, pearlescence = cold stretching; the two directions are opposite, do not adjust in reverse.

Molding Process PET; bottle blowing; white haze; crystallization; excessive heating

Q

PESU Chemical Resistance Boundary

A

PESU chemical resistance has clear boundaries; polar solvents are taboo; verification prevents failure.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molding Process PESU;chemical resistance;polar solvent;acetone;stress cracking;boundary

Q

PEI Creep Resistance Under High Temperature and Stress

A

PEI creep resistance is a relative advantage; extreme conditions still need data; long-term tracking verifies the design.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molding Process PEI;creep;high temperature;stress;modulus;design

Q

PEI Sharp Corner Stress Concentration

A

PEI's toughness and notch sensitivity coexist; rounded corner design is a prerequisite for exerting toughness; snap-fit structures are an advantageous application of PEI but require standardization.; after confirming effectiveness, fix the parameters and practices into the work instruction to pre...

Molding Process PEI;sharp corner;stress concentration;notch;rounded corner;toughness

Q

PEI Glass Fiber Reinforced Surface Roughness

A

The surface and weld line problems of PEI glass fiber parts are inherent to the material; fiber content is a design variable; verification should target weak areas.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molding Process PEI;glass fiber;surface roughness;weld line;fiber content;mold temperature

Q

PEI Melting Temperature Range Selection

A

PEI melt temperature settings must be grade-differentiated; the 382℃ discoloration line and ATX low-temperature zone are key knowledge points; manual confirmation is better than applying experience.; after confirming effectiveness, fix the parameters and practices into the work instruction to pre...

Molding Process PEI;melting temperature;357℃;ATX;grade;color

Q

PEEK Bonding and Surface Treatment

A

The success of PEEK bonding lies in surface pretreatment; inert surfaces must be activated; 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...

Molding Process bondingsurface treatmentchromic acid etchingadhesive

Q

PEEK Machining Tools and Cooling

A

PEEK machining tools are selected according to filling grade; large parts use reduced speed and strong cooling to prevent deformation; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molding Process machiningtool wearreinforced gradecooling

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