Low-pressure injection molding technology for directly generating grains on skin

Abstract

The invention provides a low-pressure injection molding technology for directly generating grains on a skin, which is used for producing plastic part products with a skin on the backing material. The technology comprises the steps of producing a special mold of which the inner surface of a cavity is provided with concave and convex grains, preheating a fixed mold, putting a skin in the fixed mold, matching molds, carrying out injection molding, dwelling pressure and forming, unloading the molds and the like to obtain the plastic part products with the skin with grains on the backing material. Because in the low-pressure injection molding technology of the invention, the special injection mold and the dwell pressure at the late stage of the low-pressure injection molding technology are used, the figures on the cavity of the mold are inversely printed on the skin, the effect of directly generating grains on the skin is achieved, and the grains have good quality.

Description

technical field [0001] The invention relates to an injection molding process, in particular to a low-pressure injection molding process for directly producing skin texture on the epidermis. Background technique [0002] In the injection molding process, there is a process used to produce plastic parts with skins, and to produce skin textures on the skins. [0003] In the prior art, an injection molding process for producing parts with skins is: first roll a certain depth of patterns on the rolled skins, and then clamp the skins between the movable and fixed molds of the injection mold for mold clamping and injection molding, so that the skins Composite with the skeleton material to get the parts we want. Since the skin will be stretched during the mold closing process, the pattern will be lost, the skin will be shiny, and the appearance will become poor, which is often not accepted by customers. Therefore, in the early stage of design, the deformation resistance of the pat...

AI Technical Summary

Problems solved by technology

This method needs to add skin preheating device, skin preforming vacuum adsorption device, pre-punching small holes in the mold cavity, long molding cycle and large investment in equipment