Screw structure of double-screw extruder

Abstract

The invention discloses a screw structure of a double-screw extruder, which is used for preparing wire-drawing proteins from high temperature defatted meal. A screw is a fully engaged co-rotating flat double-screw. The screw structure consists of a plurality of threaded elements and kneading blocks, and is divided into three functional areas which are a conveying area, a melting area and a metering and homogenization area respectively, wherein the conveying area for ensuring a material filling coefficient and realizing material premixing consists of single-start helixes and the kneading blocks; the melting area aiming to realize mixing, homogenization and cutting functions consists of the kneading blocks and grooving helixes; and the metering and homogenization area aiming to realize quantification and metering consists of double-start helixes and double-start cone helixes; and the screw consists of the threaded elements and the kneading blocks, and is formed by sleeving an internal spline and a spline spindle.

Description

technical field [0001] The invention relates to a screw structure of a twin-screw extruder, which is used for preparing drawn protein from high-temperature degreased meal, and belongs to the field of food processing machinery. Background technique [0002] my country is rich in edible plant protein resources, but the effective utilization rate is very low. In 2009, the output of soybean meal in my country was about 34.75 million tons, of which more than 90% were used as feed for animal husbandry and about 5% were used for food industry. It is also estimated that more than 3 million tons of peanut cakes in my country need to be developed and utilized urgently every year. A large amount of high-temperature defatted cakes can be used as extruded and expanded silk protein, which not only reduces the production cost of silk protein, but also improves the utilization rate of by-products in oil production. have a positive meaning. [0003] The technical difficulty of using high-t...

AI Technical Summary

Problems solved by technology

[0003] The technical difficulty of using high-temperature defatted meal to produce drawn protein is that its NSI value is only about 17%, and protein denaturation and molding are difficult. Therefore, the basic raw materials used to produce drawn protein are concentrated protein, isolated protein and part of low-temperature defatted meal. Obtaining the above-mentioned raw materials requires complex processes, resulting in high production costs

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