With this gate design, the plastic melt is guided into the molded part through a very wide and relatively thin entry cross section, allowing the flow front to spread uniformly along the edge of the component. This geometry, known as a film gate, is often used for flat, thin-walled, or visually demanding injection molded parts where highly homogeneous mold filling is required. The broad melt entry can reduce local shear loads, pressure peaks, and visible flow marks. The design of the width, thickness, and transition to the part has a major influence on filling behavior, part stress, packing pressure effectiveness, and subsequent gate removal. After injection molding, the gate is usually separated from the part mechanically or by post-processing.
Spritzgießprozess: Animation der Füllung über einen Filmanschnitt
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