Gas assisted extrusion device with feed inlet stirring function

Abstract

The invention discloses a gas assisted extrusion device with a feed inlet stirring function. The gas assisted extrusion device with the feed inlet stirring function comprises an extruder and an extruder head which is connected with the extruder in a matched mode, wherein the extruder comprises a charging barrel; the charging barrel is internally provided with a screw capable of rotating in the charging barrel; a feed inlet is provided with an impellor structure which is driven to rotate by a motor; the screw is provided with a first threaded zone and a second threaded zone connected with the first threaded zone; the first threaded zone is close to the feed inlet of the charging barrel; the second threaded zone is far away from the feed inlet of the charging barrel; the thread height of the first threaded zone is greater than the thread height of the second threaded zone; the extruder head comprises a gas input control device and an extrusion opening die provided with a gas inlet; gas in the gas input control device enters the extrusion opening die through the gas inlet; a gas layer is formed between the inner wall surface of the extrusion opening die and a fusion plastic body. The gas assisted extrusion device with the feed inlet stirring function, which is provided by the invention, has good stirring and pushing effects on the fusion plastic body, is beneficial to preventing the charging barrel from being blocked, lowers the requirement on rotation torsion of the screw, and charges rapidly.

Description

technical field [0001] The invention relates to the field of plastic thermal processing equipment, in particular to a gas-assisted extrusion equipment with a stirring function at a feed port. Background technique [0002] The extruder heats the plastic to make it into a viscous flow state. Under the condition of pressurization, it passes through a die with a certain shape to become a continuous body with a cross-section similar to the shape of the die, and then cools to make it have a certain geometric shape. The plastic of different sizes changes from a viscous fluid state to a high elastic state, and finally cools and shapes into a glass state to obtain the desired product. Through development for many years, extruder derives twin-screw, multiscrew, even does not have different types of machines such as screw rod by original single screw rod. The extruder (main machine) can be matched with various plastic molding auxiliary machines such as pipe, film, handle material, mon...

AI Technical Summary

Problems solved by technology

On the other hand, the efficiency of feeding through the feed port in the prior art is low, too much feeding at one time is not conducive to the melting and stirring of plastic materials, and may also cause blockage of the barrel

In addition, due to the resistance between the extrusion die and the extrusion melt, the existing extrusion molding technology generally has the problem of extrusion swell, that is, the cross-sectional size of the extruded product is larger than the size of the extrusion die, and the extrusion swell This greatly increases the difficulty in the design of the extrusion die, which affects the accuracy of the product. At the same time, due to the high viscosity of the molten plastic material, a large die pressure is required to overcome the resistance of the inner wall of the die to the extrudate during extrusion, resulting in a pressure drop in the die. Large, so that the internal stress of the extruded product increases, resulting in increased deformation, but also increases energy consumption, affecting the quality of plastic products

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