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Runner-free mold of thermosetting plastic point gate

A thermosetting, non-runner technology, applied in the field of injection molding, can solve the problem of low utilization of plastic raw materials

Inactive Publication Date: 2011-05-25
牟维军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The biggest disadvantage of thermosetting plastic injection molding is the low utilization of plastic raw materials

Method used

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  • Runner-free mold of thermosetting plastic point gate

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Experimental program
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Embodiment Construction

[0011] Shown in the figure is a thermosetting plastic point gate non-runner injection mold mechanism. Its characteristics are: a cold runner plate is used to set the gating system of the mold, and the cooling medium (cold water or cold oil, etc.) Some take the opposite measure, that is, use a heating device to ensure a high temperature of 170-190°C. In order to reduce the heat exchange between the cold runner plate and the molding part of the mold, a heat insulating layer is used to isolate them. At the same time, the contact part between the movable and fixed mold and the injection machine is also isolated by an insulating layer to prevent excessive heat in the mold from being transmitted to the injection machine. The key to designing a runnerless injection mold is to control the temperature of the gating system in a reasonable temperature range that ensures good fluidity of the melt and does not undergo cross-linking and hardening reactions, so as to facilitate smooth mold ...

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Abstract

The invention discloses a runner-free injection mold mechanism of a thermosetting plastic point gate. The mechanism consists of parts (the connecting mode is shown in the specification drawing) such as a movable mold insulating shim plate, a heater mounting hole, hot and cold mold insulating shim plates, a shunt runner cooling hole, a cold runner plate, a fixed mold insulating shim plate, a main runner cooling hole, a shunt mosaic bush and the like. The mold of the mechanism mainly solves the problems that the thermosetting plastic is not hardened in the injection process and is kept in a mold structure of a flowing state all the time; and the hardened thermosetting plastic cannot be reused, but when the mechanism is adopted, no runner aggregate is generated during injection molding, so the plastic raw material is saved, and the economic value is improved.

Description

technical field [0001] The invention relates to injection molding of plastic moulds, in particular to an injection mold with thermosetting plastic point gates and no runners. Background technique [0002] The biggest disadvantage of thermosetting plastic injection molding is the low utilization of plastic raw materials. For this reason, since the 1970s, foreign countries have begun to develop and apply the thermosetting plastic injection molding process without runner aggregate, and have achieved good results. At present, there are thermosetting plastic raw materials specially used for fast-curing non-runner injection molding abroad. The thermosetting non-runner injection mold is a waste thermosetting injection mold without a runner, that is, the pouring system material does not solidify and harden during the molding process, and the mold structure remains in a flowing state all the time. Since thermosetting plastics cannot be reused after curing, thermosetting runnerless ...

Claims

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Application Information

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IPC IPC(8): B29C45/26B29C45/73B29C45/27
Inventor 牟维军
Owner 牟维军