Rumination type extruder and rumination extrusion method

Abstract

The invention relates to a rumination type extruder which enables a plastic extruder screw body to have the rumination secondary plastifying function through the animal rumination principle and an extrusion method. An extruder body is included. A screw in the extruder body is composed of a sub-screw (fixed rod) and a main screw (moving rod). The front segment of the main screw is a hollow segment,and an additional thread is additionally arranged between a main thread of the hollow segment. The thread pitch of the additional thread is larger than that of the main thread, and therefore the additional thread is made to gradually form a gradually-widened additional thread groove with the main thread starting from the front thrust face of the main thread. Through holes or long holes are formedin the bottom of the thread groove to form a screen-shaped bottom groove. The sub-screw is mounted in the hollow segment of the main screw in a concentric circle manner, and the thread direction on the sub-screw is opposite to that of the main screw.

Description

technical field [0001] The invention relates to a ruminant extruder and a ruminant extruding method, which utilize the principle of animal rumination to make the screw of the plastic extruder itself have the function of ruminant secondary plasticization, and belong to the field of plastic extruder manufacturing. Background technique [0002] Existing disclosed many extruder patent documents have single-screw, twin-screw, multi-screw and screwless by form. According to the structure, there are gradual type, mutation type, separation type, barrier type, shunt type, wavy type, cone type, etc. Due to the wide variety of plastics, each has its own performance. [0003] The plastic processing process relies on the rotary motion of the screw to push the plastic raw material to move forward in a straight line, which is called the extrusion process, and plastic products of different shapes are produced through the mold. In the prior art, efforts are made to study how to efficiently...

AI Technical Summary

Problems solved by technology

This is because the screw at the output end is rotating and cannot be directly connected to the mold

[0005] The deficiencies of the above-mentioned background technology: one is that the extruder with large length-to-diameter ratio requires higher machining accuracy and reduced strength of the screw and barrel; the other is that the heat treatment level of the material is required to be improved; The bearing load increases; the fourth is that the long cantilever screw bears an increase in torque, so that the power and the number of revolutions cannot be greatly increased; the fifth is that the heating section increases and the thermal power increases, and the temperature-adjusting fans in each heating section make part of the heat energy wasteful. Sixth, poor design or low processing precision will cause excessive shearing of plastics, increase the probability of plastic molecular chain damage, and generate additional shearing heat. This shearing heat is uncontrollable. Improper control can cause The plastic is decomposed; the seventh is that the screw with a large length-to-diameter ratio is provided with a special-shaped mixing section, which not only wastes the length-to-diameter ratio but also increases the processing difficulty; Difficult to greatly improve; Ninth, the occupied space increases; Tenth, it needs to increase the transition connection device to connect with the mold

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