Injection mold with closable branch runners

By designing closed branch runners and return mechanisms in the injection mold, the problem of plastic cooling forming and adhering to the product in the branch runner is solved, and the effect of reducing waste and improving mold release is achieved.

CN119704561AInactive Publication Date: 2025-03-28SHENZHEN PRINSTON MOULD PLASTIC CO LTD
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Patent Information

Application Number
CN202411736824.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-29
Publication Date
2025-03-28
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

During the injection molding process, the tributary channel is fully connected to the mold cavity, causing the plastic in the tributary channel to cool and mold, and then adhere to the product when the product is demolded, forming waste.

Method used

An injection mold for closing of the branch runner is designed, using a return mechanism and a hydraulic telescopic rod to push the plastic in the branch runner back to the main runner through the return mechanism. The hydraulic telescopic rod drives the moving block to assist the cutting assembly to push the plastic in the branch runner away.

Benefits of technology

It effectively reduces the possibility that the product will bring out more plastic through branch channels when cooling, reduces the generation of molding waste, and improves the convenience of product molding.

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Abstract

The invention discloses an injection mold with closable branch runners, and relates to the field of injection molds, the injection mold comprises a first mold, a second mold is arranged on one side of the first mold, a main runner is formed in the second mold, branch runners are arranged at the two ends of the main runner, and a backflow mechanism is arranged between the main runner and the branch runners; and an injection molding opening is formed in the mold II. Molten plastic is injected into the injection molding opening, then enters the main runner, penetrates through the backflow mechanism from the main runner and then enters the two branch runners from the backflow mechanism, and after the part between the first mold and the second mold is filled with the plastic, the backflow mechanism pushes the plastic staying in the backflow mechanism back into the main runner; when a product is demoulded from the mould I and the mould II, the product only carries a small part of plastics in the branch runners, so that the possibility that the product carries more plastics out of the branch runners when being cooled can be reduced, and the generation of waste materials of product molding is reduced.
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