In-mold injection molding method producing finished product with metal surface and finished product thereof

Abstract

The invention relates to an intra-mould injection molding method for a finished product with metal surface and the finished product. The intra-mould injection molding method comprises the following steps: a metal sheet with the outer surface and the inner surface is provided; the inner surface of the metal sheet is coated with a buffer layer for heat insulation; a viscose glue layer is coated on the metal sheet in order that the buffer layer is between the metal sheet and the viscose glue layer; the metal sheet coated with the buffer layer and the viscose glue layer is positioned inside an injection molding mould; the outer surface of the metal sheet faces to the inner wall of the mould; and the metal sheet is subjected to injection molding to obtain a combination body combined by the metal sheet and injection plastic. The finished product comprises a metal layer, the buffer layer, the viscose glue layer and a plastic layer. Before carrying out intra-mould injection molding on the metal sheet, the buffer layer is coated on the metal sheet; and the buffer layer can obstruct high temperature from the mould and liquid plastic in hot press molding and intra-mould injection, avoids producing thermal expansion and cold contraction of the metal sheet and provides a good agglutination medium between the metal sheet and the viscose glue layer, thereby improving the stability of agglutination between the metal sheet and the plastic.

Description

technical field [0001] The invention relates to an in-mold injection molding method and its finished product, in particular to an in-mold injection molding method in which the surface of the finished product is metal and the finished product. Background technique [0002] A known method of making the surface of an injection-molded plastic product a metal material is to put the metal sheet into an injection-molded mold for in-mold injection molding, and combine the metal sheet with the injection-molded plastic to obtain a A plastic product with a metal surface. However, the disadvantage of this method is that during the in-mold injection molding process of the metal sheet in the mold, it is easily deformed by the "heat expansion" when it comes into contact with high-temperature liquid plastic and the "cold contraction" when the finished product is cooled. After injection molding, the metal flakes on the plastic surface are prone to unevenness and deformation, which will affe...

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Problems solved by technology

However, the disadvantage of this method is that during the in-mold injection molding process of the metal sheet in the mold, it is easily deformed by the "heat expansion" when it comes into contact with high-temperature liquid plastic and the "cold contraction" when the finished product is cooled. After injection molding, the metal flakes on the plastic surface are prone to unevenness and deformation, which will affect the appearance of the product

In addition, although this method coats the metal sheet with an adhesive layer before injection molding to facilitate bonding with the plastic, the bonding stability of the metal material and the plastic material is still insufficient when using the adhesive

[0003] Another known way to make the plastic surface have a metallic texture is to first coat a layer of metal film on the plastic film to be injected into the mold by vacuum plating or sputtering. The film is then subjected to in-mold injection molding, but since this method only coats a layer of metal film on the plastic film, at best it only makes the surface of the plastic product have a metal appearance and texture, but if you want the surface of the plastic product to have the hardness of a metal material , this method does not achieve the desired effect

[0004] It can be seen that the method, product structure and use of the above-mentioned existing injection-molded plastic products with a metal surface and the finished products obviously still have inconveniences and defects, and need to be further improved urgently.

In order to solve the above-mentioned existing problems, relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and there is no suitable method and structure for general methods and products to solve the above-mentioned problems. This is obviously a problem that relevant industry players are eager to solve

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