A polyurethane screen forming process

Abstract

The invention discloses a polyurethane screen molding process. A polyurethane screen comprises a screen surface and a crocheted edge; the screen surface is a rectangular; the crocheted edge is fixedly connected with the screen surface; the screen surface is provided with a transverse edge frame, a longitudinal edge frame bottom frame and longitudinal reinforcing ribs; the longitudinal reinforcing ribs are uniformly distributed on the screen surface at intervals; the longitudinal reinforcing ribs are vertical to the transverse edge frame; the longitudinal reinforcing ribs are parallel to the longitudinal edge frame bottom frame; the crocheted edge comprises a reinforcing part; the polyurethane screen molding process comprises the following steps of: S1, pouring and molding the screen surface on a mold through utilizing polyurethane in one step; S2, spreading the reinforcing part on a crocheted edge molding strip and molding the crocheted edge by adopting a mold pressing molding manner; S3, carrying out secondary compound molding on the crocheted edge and the screen surface of sticking the crocheted edge and the screen surface, so as to fixedly connect the crocheted edge and the screen surface; and S4, carrying out subsequent treatment on the molded polyurethane screen and finishing the molding of the polyurethane screen. By adopting the polyurethane screen molding process, the design and manufacturing difficulties of the mold are greatly reduced and raw materials are saved.

Description

technical field [0001] The invention relates to the technical field of polyurethane screen forming, in particular to a polyurethane screen forming process. Background technique [0002] Polyurethane screen is made of polyurethane elastomer, a new synthetic material between plastic and rubber. It is widely used because of its high precision, high screening efficiency and long service life when used with laminated vibrating screen Coal preparation, mineral processing and other industries. [0003] At present, there are three main processes for the production of polyurethane screens in China: (1) First, the polyurethane sheet is formed, and then the sheet is opened; the polyurethane screen produced by this process has a low opening rate and low screening efficiency; ( 2) Forming small pieces of polyurethane screen surface first, and then splicing; although this process improves the opening rate and screening efficiency, but because the entire screen surface is spliced ​​by sma...

AI Technical Summary

Problems solved by technology

[0003] At present, there are three main processes for the production of polyurethane screens in China: (1) First, the polyurethane sheet is formed, and then the sheet is opened; the polyurethane screen produced by this process has a low opening rate and low screening efficiency; ( 2) Forming small pieces of polyurethane screen surface first, and then splicing; although this process improves the opening rate and screening efficiency, but because the entire screen surface is spliced ​​by small pieces, the internal reinforcement line cannot be continuously penetrated The whole screen cannot provide enough elasticity and tensile strength for the screen, and there are still insufficient screening efficiency and life; (3), the screen is integrally formed at one time; this process is currently the best production in China The process ensures that the reinforcement line runs through the entire screen continuously, so that the screen has a high screening efficiency, and at the same time allows the screen to have the highest opening rate, but this process also has certain shortcomings

The process of producing polyurethane screens in China is not perfect enough, and there are still many problems and defects to be solved

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