With this gate design, the plastic melt is introduced into the molded part through a widely spread cross section, allowing the flow front to expand more uniformly across a larger part width. This geometry forms the characteristic fan gate, which is particularly used for flat or thin-walled injection molded parts. The broad outlet area can reduce local shear peaks, weld lines, and visible flow marks. Width, thickness, and the transition to the part must be carefully designed because they influence pressure loss, filling behavior, part stress, and subsequent gate removal. After injection molding, the gate is usually mechanically separated from the part.
Injection molding: Filling the cavity via a fan gate
Related topics:
Gate
This glossary of plastic industry is provided by PLEXPERT Canada Inc.
