Non-return ring free multiaxial volume pulse injection forming method and device

Abstract

The invention discloses a non-return ring free multiaxial volume pulse injection forming method and device. In the method, eccentricity exists between at least two mutually engaged eccentric rotors arranged in a material barrel, spiral sections as well as straight sections and the axial direction. When the eccentric rotors rotate, periodical change occurs to the radial distance between the two adjacent eccentric rotors, periodical change occurs to the volume of the closed space formed among the outer surfaces of the eccentric rotors, an inner hole of the material barrel and the eccentric straight sections, to-be-injected materials flow into the adjacent eccentric spiral sections through the eccentric straight sections, and complete positive displacement conveying is conducted on the materials. In the device, the at least two mutually engaged and counter-rotating eccentric rotors are arranged in the material barrel. The at least two eccentric rotors are both provided with the spiral sections and the straight sections at intervals. The center lines of the spiral sections as well as the straight sections and the rotary axis are eccentric. The eccentric directions of the adjacent eccentric rotors are opposite. According to the non-return ring free multiaxial volume pulse injection forming method and device, vibration energy wasted by a non-return ring is avoided, and the influence of the pressure of pulse change on the mold filling and pressure maintaining process is enhanced.

Description

technical field [0001] The invention relates to injection molding, in particular to an injection molding method and device for plastic blending modified materials and long fiber online compounding materials, and belongs to the field of polymer material molding processing equipment. Background technique [0002] Injection molding has the advantages of high production efficiency, strong adaptability, and wide application, and is suitable for the molding and processing of almost all thermoplastics and their composite systems. According to the composition and structural principle of injection molding equipment, the current injection molding equipment is mainly divided into two types: screw plunger type and reciprocating screw type. [0003] The reciprocating screw injection machine adopts a single-screw plasticizing system. Generally speaking, the length-to-diameter ratio of the screw and barrel of the plasticizing system is smaller than that of the extruder, and the screw moves...

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the commonly used injection machines such as poor plasticizing and mixing effect, uneven distribution of material residence time, and the need for a check device with a complex structure, and to provide a multi-axis volume pulsation injection molding method without a check ring To solve the problems of poor mixing effect, long thermomechanical process, and high energy consumption of conventional injection molding methods and devices for plastic materials, and to realize volume pulsation injection molding processing of plastic modified materials and long-fiber online compounding materials without a check loop method

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