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Design of auxiliary runner for plastic products

by:SMART DRAGON     2019-12-10

(1) Function and application of auxiliary runner

①, the plastic products in one mold and multiple cavities are still connected together after the mold is released to facilitate packaging, transportation, assembly and subsequent processing (Such as electroplating, etc).

②, an auxiliary runner is added at the penetration position of plastic products to improve melt flow.

③ to improve the strength and rigidity of plastic products.

④ to ensure that plastic products remain on the side with a push-out structure after mold opening.

(2) Auxiliary runner design

The following points should be paid attention to in the design of auxiliary runner.

①, diameter is generally 30 3 ~ 4mm. If the auxiliary flow channel is increased to improve melt flow, the diameter of the auxiliary flow channel can be determined according to the size of the plastic product.

② the gate size is 2mm × 1mm, and each plastic product usually has three gate links.

③, the auxiliary flow channel shall be connected through the flow channel and the main channel to facilitate melt flow.

④, putter shall be designed on the auxiliary flow path, and the diameter of putter shall be 30 3 ~ 4mm.

⑤, to ensure that plastic products remain on the side with a push-out structure after mold opening, the cross section shape of the flow channel should be trapezoidal or U-shaped. In other cases, the cross-sectional shape of the auxiliary runner shall be made into a circle.

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