Steven Cheng

Steven Cheng

  • Joined: July 13, 2012
  • Articles: 170

stack mould

Stack molds are a few of the the majority of amazing manufacture mould available anywhere. The design and skillfullness that goes directly into a stack custom mold is actually a marvel. To the layman, who may never have constructed a…

hot runner design

Hot runner design keeps plastic melt hot from the machine nozzle to the cavity gate. Heated manifolds and drops replace cold runners, so the mold produces parts without runner scrap. A well-designed system balances fill across cavities, holds melt temperature…

Sink

A Sink Mark can be defined as a depression, resembling a dimple or groove, caused by excessive localized shrinking of the material after the part has cooled. MACHINE BARREL TEMPERATURE TOO HIGH Explanation: If the barrel temperature is too high,…

Knit Lines,Weld lines

Knit Lines (Weld Lines) A knit line forms wherever two melt fronts meet and fail to fully merge. The line is always weaker than the surrounding plastic. In the worst case it holds about 20% of the base strength. In…

gate type of plastic mold

Gate style such as: 1. Sprue gating (straight into component) 2. Fan gates 3. Tunnel or submarine gates 4. Flash gates 5. Edge gates (tab or fan style) 6. Hot runner systems The size and look from the completed component should be regarded as…

Shrinkage of thermoplastics

Shrinkage of  thermoplastics Amorphous thermoplastics show extremely reduced shrinkage once they solidify, usually among 0.6% and 1.1%. Scmicrystalline supplies shrink greatly much more, generally among one.7% and 5.5% based on the actual materials. The bigger shrinkage using the semicrystalline supplies…