Extruding, granulating and postprocessing process of polyurethane universal plastic

Abstract

The invention belongs to the technical field of polyurethane granulating, and particularly relates to an extruding, granulating and postprocessing process of polyurethane universal plastic. The process includes the following steps of firstly, primary screening, wherein polyurethane particles are put into a shell from a feed port and primarily screened through the portion, between a first conveyingroller and a first guide roller, of a first conveying belt and the portion, between a third conveying roller and a fourth guide roller, of a second conveying belt; secondly, secondary screening, wherein the primarily-screened polyurethane particles are secondarily screened through the portion, between a second guide roller and a third guide roller, of the first conveying belt and the portion, between a fifth guide roller and a sixth guide roller, of the second conveying belt; and thirdly, classified collecting, wherein the primarily-screened polyurethane particles and the secondarily-screenedpolyurethane particles are collected according to the classifications of large size, medium size and small size through a collecting device. The polyurethane particles are prevented from caking afterbeing processed through the process, the screening effect is improved, and the soil utilization rate of a production workshop is increased.

Description

technical field [0001] The invention belongs to the technical field of granulation of polyurethane plastics, and in particular relates to a post-treatment process of extrusion granulation of polyurethane general-purpose plastics. Background technique [0002] Granulation technology has been more and more widely used in various industries such as chemical industry, medicine, food, building materials, metallurgy, etc. At the same time, granulation technology itself is constantly innovating, developing and improving in the process of application, and has created Many different granulation methods. Granulation can make polyurethane plastic more filling, stronger, and more delicate in structure. After the existing polyurethane granulation is completed, it is directly packaged and transported or sent to subsequent processing equipment for processing, resulting in the following problems in the subsequent transportation or processing: (1) The polyurethane granules are not sufficien...

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Problems solved by technology

[0004] The invention provides a post-treatment process of polyurethane general-purpose plastic extrusion and granulation, aiming to solve the following problems in the direct transportation or processing of existing polyurethane plastics after granulation: (1) The polyurethane granules are not sufficiently cooled, and the internal temperature remains Higher, the heat inside the polyurethane particles is gradually transferred to the outside, which makes the surface temperature of the polyurethane particles rise and the viscosity increases, causing adjacent polyurethane particles to bond together into a block, which seriously affects the effect of granulation; (2) Polyurethane particles of different volumes and sizes are mixed together after granulation and cannot be sieved; because polyurethane particles of different sizes have different physical properties, it is impossible to accurately control the physical properties of the finished product after being mixed together for subsequent processing

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