Injection molding method and mold for injection molding

Abstract

There is provided a mold for injection molding for manufacturing a resin injection-molded product. A provisional rib portion corresponding to a provisional rib which is to be formed to project from a portion, of the molded product, not serving as a design surface is formed at a predetermined position of a cavity so as to extend along the provisional rib, wherein resin is injected for molding to the provisional rib portion via a gate. The gate is formed as a submarine gate or a nose gate.

Description

technical field [0001] The present invention relates to an injection molding method and an injection molding mold using resin etc. as materials. Background technique [0002] In injection molding, the gate of the molding die is generally used such as image 3 side gate as shown or Figure 4 Overlapping gates shown. Here, these molding dies will be briefly described. The forming die 10 is composed of a metal mold 11 (movable or fixed mold) and another metal mold 12 (fixed or movable mold), and the die cavity 14 is formed by closing the parting surface (partition surface) 13 . The molten resin flowing from the runner 15 passes through the gate 16 ( image 3 : side gate 16A; Figure 4 : Overlap gate 16B) Filling is injected into the cavity 14. [0003] In the past, molding was mainly performed using a resin material called solid color (solid color) that does not contain a brightener, so even if injection molding is performed through a side gate or a double gate, there will ...

AI Technical Summary

Problems solved by technology

This resin shear makes swirls and silver streaks easy to produce

Therefore, when using a sinker gate as an exterior part, there is a problem that it is limited to resin materials that are difficult to apply shear or colors that are not conspicuous even if swirls and silver streaks are generated.

However, in these countermeasures, the shape, particle size, and addition amount of the brightener are limited, so textures such as glossy and metallic textures are limited, and it is impossible to obtain a highly metallic color tone that can replace high-quality painting or plating.

In addition, the occurrence of fusion lines cannot be completely suppressed, and the cost has to be increased due to the preparation conditions

[0012] The actual situation is that in the past, it was difficult to remove the poor appearance from the gate part, and it had to rely on painting and plating

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