Edge gate characteristic of injection mold are gate and runner on parting surfaces, the mold two-platen (single parting surface) structure. When molten material from the sides of the cavity filling mould, adjusting the edge gate of the section thickness and width can adjust filling the melt shear rate and the curing time of the gate.
The cross-sectional shape of the edge gate is simple, easy processing, mainly for small and medium sized plastic injected parts of the multiple-cavity mould, which have good adaptability to all kinds of plastic injection molding. But the side of the products left traces, which will affect the appearance of products, injection pressure losses and Deep type plastic molding process exhaust inconvenience. The edge gate size can be calculated according to the experience formula:
b—The width of the edge gate
A—Plastic parts surface area
h-—The thickness of the edge gate
Here are some edge gates design (Fig1 and Fig2). Edge gates (rectangular inlets) are used most often in a variety of injected plastic parts. The gate comes out in a straight line from the runner to the nest. The gate is placed along the side or width of plastic injection parts, and the width can range anywhere from 1.5 to 5.0mm, the height from 0.5 to 1.5mm and the length is 1.5 to 2.5mm. For large and complex object, the width of gate is 7.0 to 10.0mm, the height is from 2.0 to 2.5mm that is approximately 0.7 to 0.8 times the nominal wall thickness of plastic parts, and the length if from 2.0 to 3.0mm.
Fig 1 Edge gate design
Fig 2 Edge gate design
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