Injection moulding method of membrane inside mould

Abstract

The invention relates to an injection moulding method of a membrane inside a mould, comprising the following steps: correspondingly adjusting the shape of the membrane according to the shape of a mold cavity inside the mould; then correspondingly placing the membrane into the mold cavity; and finally ejecting a plastic to be moulded in the mould so that the membrane is closely jointed with the plastic.

Description

technical field [0001] The present invention relates to an injection molding method, in particular to an In-Molding Film (IMF) injection molding method. Background technique [0002] It is a widely used technology to mass-produce products by using injection molding (Injection Molding). Injection molding equipment can be used to quickly manufacture large quantities of plastic molded products, such as mobile phone casings or notebook computer casings. In addition, in order to make the product more beautiful, patterns can be formed on the product combined with the film, and there is the emergence of the In-Mold Film (IMF) injection molding technology. [0003] Figure 1A to Figure 1C It is a schematic diagram of a general in-mold diaphragm injection molding method. Such as Figure 1A As shown, a diaphragm F1 with a preset pattern is first placed in a mold cavity 101 of a mold 10. The mold 10 has a male mold 102 and a female mold 103, and the mold cavity 101 is combined by th...

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Problems solved by technology

[0004] However, since the diaphragm F1 is in the shape of a flat plate, its rigidity is low, so that the pressure generated by the injection of the plastic 111 causes the diaphragm F1 to deviate, so figure 2 One side P11 of the molded product P1 shown, the membrane F1 protrudes from the base material 112 and is not aligned

In addition, due to the poor rigidity of the diaphragm F1, flashing is caused on the other side P12 of the molded product P1. Pass through the raised part of the diaphragm F1 and cover the diaphragm F1

Due to the deviation and overflow of the diaphragm F1, the yield rate of the product is greatly reduced, and the quality requirements cannot be met

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