Anti-cracking multi-gradual-division type resin injection blow molding process

Abstract

The invention discloses an anti-cracking multi-gradual-division type resin injection blow molding process, and belongs to the field of resin forming processes. According to the anti-cracking multi-gradual-division type resin injection blow molding process, a double-end tow is arranged on a hollow core mold, and meanwhile, a layer of swelling film is tightly attached to the outer end of the hollow core mold; in the parison injection molding process, by means of large-area deep contact between the swelling film and the double-end tow and a parison, friction force and supporting resistance borne by the parison during automatic droop can be greatly improved, the self-weight droop condition of the parison is reduced, the uniformity of the wall thickness of the parison is improved, and the parison is not prone to cracking during expansion; and in addition, in the parison blow molding swelling process, through outward expansion of the swelling film and the double-end tow, the airflow pressure uniformly and comprehensively acts on the parison, so that the situation that the parison is locally cracked due to airflow impact is greatly reduced, and the quality of a finished product is further ensured.

Description

technical field [0001] The invention relates to the field of resin molding technology, more specifically, relates to a crack-proof multi-gradual resin injection blow molding technology. Background technique [0002] Resin usually refers to an organic polymer that softens or melts after being heated, has a tendency to flow under external force when softened, and is solid, semi-solid, or sometimes liquid at room temperature. In a broad definition, any polymer compound that can be used as a raw material for plastic products is called a resin. [0003] Resin can be formed by injection molding, blow molding, extrusion molding, rotational molding and other molding methods to produce film products, daily necessities and industrial hollow containers of various sizes, pipes, calendering tapes and ligatures for packaging, ropes, fishing nets and weaving. Fibers, wires and cables, etc. Blow molding mainly includes extrusion blow molding and injection blow molding. In the injection bl...

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Problems solved by technology

[0006] Aiming at the problems existing in the prior art, the object of the present invention is to provide a multi-gradient resin injection blow molding process with anti-cracking method, which arranges double-ended filaments on the hollow mandrel, and at the same time at the outer end of the hollow mandrel A layer of swelling film is closely attached. During the injection molding process of the parison, the friction force on the parison when it automatically sags can be greatly improved through the large-area deep contact between the swelling film and the double-ended tow and the parison. and support resistance, reduce the sagging of the parison due to its own weight, improve the uniformity of the parison wall thickness, and make the parison less likely to crack when it expands. The outward expansion of the double-ended tow makes the air pressure evenly and comprehensively act on the parison, greatly reducing the local cracking of the parison due to the impact of the air flow, and further ensuring the quality of the finished product

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