Internal heating type multi-cavity hot runner mold

A multi-cavity, hot runner technology, applied in the field of plastic injection molding molds, can solve the problems of easy condensation of the melt and easy blockage of the gate

Inactive Publication Date: 2011-04-27
牟维军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to overcome the shortcoming that the melt is easy to condense and the gate is easy to be blocked in the "well pit" of the well nozzle, the "well pit" is removed, and the nozzle of the injection machine is extended to the vicinity of the gate connected with the cavity, so that the pouring Mouth plastic remains molten

Method used

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  • Internal heating type multi-cavity hot runner mold

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Embodiment Construction

[0010] The figure shows a hot runner injection mold with internal heating and multiple cavities. It is equipped with a heater in the entire runner, and a rod-shaped heater is also installed inside the nozzle, and extends to the center of the gate, that is, the entire gating system is heated. Its thermal insulation is based on the condensation layer formed by the contact between the melt and the mold. Such a flow channel has low heat loss and high thermal efficiency, and will not solidify even if the molding cycle is long. At the same time, the diameter of the flow channel is larger to facilitate the placement of the heater, and the flow channel is arranged in a staggered way. On the other hand, this mechanism is not only suitable for single-point feeding, but also can be used for multi-point feeding of large products. In addition, in order to avoid drooling when injecting low-viscosity plastics, the mold is specially designed with a valve gate device. At the same time, the d...

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PUM

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Abstract

The invention relates to an internal heating type multi-cavity hot runner injection mold, comprising the following parts: a pipe type heater, a runner torpedo body, a hot runner plate, a nozzle torpedo body, a fixed mold seat plate, a locating ring, a main runner bushing, a main runner torpedo body, a sprue plate, a secondary nozzle, a mold core, a fixed mold cavity plate and the like (a connection mode is shown in a specification figure). The mechanism has small heat loss and high thermal efficiency and simultaneously can be used for the multiple feed of large-sized products. When the internal heating type multi-cavity hot runner injection mold is in heating, because a heating hole is arranged in the hot runner plate and the pipe type heater is inserted into the hole, plastics in the runner are kept to be in the melting state all along. The secondary nozzle is made of beryllium copper alloy with good thermal conductivity and high strength so that heat can be easy to transfer to the front end. Because the secondary nozzle and the outer wall of a cavity are not insulated in an annular area, the secondary nozzle is called as a semi-insulation nozzle. The secondary nozzle and the hot runner plate are in sliding fit and are sealed by using a packing. During injection moulding, the secondary nozzle and the sprue bushing can be well fit due to the pressure of the plastics so that flash is not generated.

Description

Technical field: [0001] The invention relates to a plastic injection molding mold, which is an internal heating type multi-cavity hot runner mold. Background technique: [0002] At present, the main channel and the runner part of this type of mold are heated to keep the plastic in the molten state, so that the injection molding can be carried out normally, and it is not limited by the molding cycle. After shutdown, there is no need to open the flow channel to take out the flow channel condensate. When starting up again, you only need to turn on the power supply and reheat until the required temperature is reached. In the design of the heating runner mold, the key is the heating device of the runner, the temperature adjustment system, the heat insulation measures of the mold and the prevention of coagulation and salivation at the gate. Combined with years of design experience in the first line of production, the following mold structure is provided to the mold industry. Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/26B29C45/72B29C45/27
Inventor 牟维军
Owner 牟维军
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