Hollow blow molding forming process and mold

Abstract

The invention relates to a hollow blow molding forming process and a mold. The process comprises: A, material loading, wherein a hollow material blank is extruded through a material outlet device head of a blow molding machine, and a material blank cavity previously contains naturally entering air; and B, forming, wherein the material blank is conveyed to a blow molding mold, a pre-extrusion mold in the blow molding mold is firstly closed, the material blank positioned outside the forming mold of the blow molding mold is extruded, the gas in the part of the material blank cavity is extruded into the material blank positioned inside the forming mold, mold closing is continuously performed, the forming mold in the blow molding mold is closed, and the excess part is cut so as to form the sealed hollow product. According to the present invention, the material blank previously contains the gas during the material loading, all the gas is extruded into the forming part during the pre-pressing, and then forming is performed, such that the use of the gas blowing needle to blow the gas during the blow molding process is not required so as no leave the gas blowing hole on the hollow product; and with the gas extruding way, the wall thickness of the hollow product is uniform, and the quality of the hollow product is improved.

Description

technical field [0001] The invention relates to a hollow blow molding process and a mold used in the process. Background technique [0002] The sealed hollow products in the prior art are generally made by blow molding process. In this process, plastic or other materials are first melted and sent into a blow mold, and gas is injected through a blow needle to form a hollow body structure. For example, the invention patent with the Chinese patent number CN200810218745.X, which was published on April 8, 2009, discloses a mold forming process for injection blown plastic hollow containers. The specific steps include: the injection molding process of the injection molding machine and the blow molding process. machine blow molding process. In the above-mentioned injection molding process and blow molding stage, after the mold is opened, the forming mandrel is always fixed in the movable mold, and no power mechanism is required to drive the rotation or translation; the injection mo...

AI Technical Summary

Problems solved by technology

This blow molding process will leave blow holes on the product, which will affect the quality of the product. At the same time, this blow molding process will make the wall thickness of the product uneven, which will also affect the quality of the product.

Images