Problem & Solution

Practical answers to common plastic material challenges

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PP Injection Multi-cavity Imbalance

For multi-cavity imbalance, first measure filling balance.

Injection Molding PP;multi-cavity;balance;runner;valve gate

PP Injection Part Weld Line Whitening

White weld line = cold front + gas and impurity enrichment.

Injection Molding PP;weld line;whitening;venting;overflow well

PP Part Surface Ripple (Flow Mark)

Ripple = disordered front rhythm—smooth out the speed profile.

Molds & Tooling PP;ripple;melt front;speed profile;mold temperature

PP Injection Part Short Material—Poor Venting Type

Repeated fixed-point shortage = poor venting—locate with the short shot method.

Injection Molding PP;material shortage;venting;short shot method;gate

PP Part Stress Crack Resistance

Verify ESCR before holding chemicals.

Production & Quality PP;ESCR;stress cracking;media;grade

PP '2079851475616104458 Cold Mark

Thermoforming PP;'2079851475616104458;cold mark;temperature;mold;vacuum

PP '2079851475616104458 Webbing

Thermoforming PP;'2079851475616104458;webbing;pre-blow bubble;TPO

PP-R Pipe Extrusion Rough Surface

For rough surface, check temperature and raw material first.

Extrusion & Post PP-R;pipe;rough surface;temperature;raw material

PP '2079851475616104452 Shear Mark (Melt Fracture Mark)

Injection Molding PP;shear mark;melt fracture;gate;injection speed

PP Part Shrinkage Exceeding Design

Molds & Tooling PP;shrinkage rate;dimensional deviation;wall thickness;mold correction

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