Micro-foaming injection-molding screw rod

Abstract

The invention discloses a micro-foaming injection-molding screw rod, mainly comprising a rear screw rod, a rear positioning ring, a rear check ring, a rear mixing section, a front mixing section, a front screw rod, a front positioning ring, a front check ring and a screw rod head, wherein hexagonal threads are adopted for the rear mixing section and the front mixing section, forward threads consistent with the turning direction of the screw rod are adopted for the rear mixing section, and reverse threads are adopted for the front mixing section and are provided with forward grooves. The micro-foaming injection-molding screw rod has a greatly improved mixing and homogenizing effect so that supercritical gas rapidly and uniformly distributes in a polymer melt so as to form a stable polymer melt / supercritical gas homogeneous system; meanwhile, checking is carried out in a gas inlet position so as to effectively prevent the melt from flowing back to block a gas inlet channel; and the special micro-foaming injection-molding screw rod can be widely applied to micro-foaming injection machines of various types.

Description

technical field [0001] The invention relates to an injection molding screw, in particular to a screw suitable for microfoaming injection molding. Background technique [0002] In recent years, people's requirements for plastic products have been continuously improved, especially in terms of energy conservation and environmental protection. It is required to reduce production costs as much as possible while meeting the use requirements of products, improve resource utilization, and realize green manufacturing. Injection molding is an important method for the molding and processing of polymer materials. Micro-foaming injection molding is one of the new injection molding technologies. This technology not only saves raw materials but also shortens the molding and processing cycle of products. It is a typical green processing technology. . [0003] The screw is an important plasticizing part of the injection machine and plays a vital role in the molding process. The traditional...

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Problems solved by technology

[0004] The purpose of the present invention is to propose a micro-foaming injection molding screw, which can overcome the shortcomings of the traditional screw with insufficient mixing capacity, greatly improve the mixing effect of the screw, and make the supercritical gas quickly and evenly distributed in the polymer melt, forming a stable Polymer melt / supercritical gas homogeneous system; at the same time, due to the use of a non-return structure at the screw inlet position, it can effectively prevent the melt backflow from blocking the inlet channel and ensure the continuous stability of the micro-foaming injection molding process; this kind of Microfoaming injection screw can be widely used in various types of microfoaming injection machines

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