Special non-woven fabric screw for extruder

Abstract

The invention discloses a special non-woven fabric screw for an extruder, comprising a feeding segment, a compression segment and a metering segment. The special non-woven fabric screw for the extruder is characterized in that the compression segment comprises a first compression segment with the screw diameter gradually decreased and a second compression segment with the screw diameter graduallyincreased, the maximum screw diameter of the first compression segment is equal to the screw diameter of the feeding segment, the maximum screw diameter of the second compression segment is equal to the screw diameter of the metering segment, the screw diameter of the metering segment is smaller than the screw diameter of the feeding segment, and a thread pitch of the metering segment is smaller than that of the feeding segment. Through the first compression segment and the second compression segment with gradually changed equidistance, the invention increases the fusion and compression timesof a screw to a non-woven fabric, and carries out complete compression when the non-woven fabric is conveyed to enable the non-woven fabric to be more dense, sufficient and uniform, thereby ensuring the product quality. Meanwhile, the invention has the advantages of stable feeding and balanced output of the metering segment, thereby enhancing the fusion and extrusion velocity.

Description

technical field [0001] The invention relates to a screw structure, in particular to a special screw structure for an extruder to convey non-woven fabrics. Background technique [0002] The screw of the extruder is an important part of the extruder. It is made of high-strength and corrosion-resistant alloy steel. Through its rotation, the plastic in the barrel can move, get pressurized and part of the heat (friction heat) . The application range and productivity of the extruder directly depend on the temperature uniformity of the melt extruded by the machine and the stability of the pressure and extrusion volume, and these parameters directly depend on the structural characteristics of the screw. [0003] The geometric parameters of the screw, such as diameter, length-to-diameter ratio, length ratio of each segment and depth of the screw groove, etc., have a significant impact on the working characteristics of the screw. The existing screw can be divided into three sections...

AI Technical Summary

Problems solved by technology

When the screw of this structure is used in the extruder to convey the non-woven fabric, the molten non-woven fabric is mixed unevenly due to the equal screw pitch, the feeding is unstable, and the non-woven fabric is extruded from the compression section to the mold. The time is relatively long, so that the extruded material is not dense and the compression is not complete, resulting in unbalanced output of the metering section, reducing the quality of the melt, and slowing down the rate of melting and conveying, affecting the production efficiency of the enterprise

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