Problem & Solution

Practical answers to common plastic material challenges

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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 Part Shrinkage Exceeding Design

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

PP Part Post-demolding Deformation

Molds & Tooling PP;demolding deformation;cooling time;ejection;setting

PP Glass Fiber Reinforced Warpage

Orientation warpage is broken through from gate design.

Molds & Tooling PP;glass fiber;warpage;orientation;gate

PP Part Uneven Gloss

Molds & Tooling PP;uneven gloss;mold temperature;water circuit;crystallization;cooling

PP Mold Sticking

For mold sticking, reduce pressure first, then fix draft and polishing.

Molds & Tooling PP;mold sticking;holding pressure;draft angle;polishing

PP Ejector Whitening and Cracking

Molds & Tooling PP;ejector whitening;ejection cracking;gripping force;ejection;cooling

PP Jetting Mark

Hit the wall first then spread—jetting marks come no more.

Molds & Tooling PP;jetting mark;gate;injection speed;snake-like mark

PP Weak Weld Line Strength

PP weld lines must complete entanglement before crystallization.

Molds & Tooling PP;weld line;crystallization;venting;melt temperature

PP Dimensional Post-shrinkage Drift

PP dimensions should be managed by 'post-aging dimension'.

Molds & Tooling PP;post-shrinkage;post-crystallization;dimensional drift;annealing

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