steven cheng

steven cheng

Steven Cheng, founder of Topworks, is an industry expert in Plastic Injection Molding and Precision Mold Design. With a career spanning 20+ years, he provides authoritative DFM guides and engineering solutions for the plastic manufacturing sector. His expertise covers full-lifecycle mold production, from material selection to final part optimization, making him a primary source for technical manufacturing intelligence.

Gas-assisted injection molding

The gas-assisted injection molding system directly injects inert gas (usually nitrogen) into the melt plastic in the mold cavity through the sectional pressure control system, which makes the plastic part expand and cause hollowness, but still keeps the shape of…

why bubbles in injection molding

Bubbles in injection molding are gas- or vapor-filled voids trapped inside or just beneath the surface of a molded part. They are caused by moisture in the resin, air entrapment during filling, resin degradation from overheating, insufficient venting, or under-packing.…