Method for making polyurethane foam with fibre pad added thereto, and volume increasing device

Abstract

A manufacturing method of a polyurethane foam injected with strand mats and a device for increasing the volume of the strand mats. The method comprises the steps of: increasing the volume of each of the strand mats to weaken the cohesion between glass fibers in each of the strand mats; continuously supplying and transferring the volume-increased strand mats; spraying a polyurethane foam solution on the continuously transferred strand mats; and foam molding the polyurethane foam solution in which the strand mats are immersed, into a polyurethane foam. Because the cohesion between the glass fibers in the strand mat is weakened and the volume of the strand mat is increased, the polyurethane foam solution uniformly permeates into the strand mats. As a result, the productivity of the polyurethane foam is improved and the variations in a variety of the mechanical properties are minimized.

Description

technical field [0001] The present invention relates to the polyurethane foam that adds fiber mat, particularly relates to adding a process of increasing the volume of fiber mat in the manufacture method of polyurethane foam, so that the fiber mat is evenly distributed inside the polyurethane foam, which can A method for producing polyurethane foam with a fiber mat and a device for increasing the volume of the fiber mat to reduce product loss and improve productivity. Background technique [0002] Generally, polyurethane foam is a spongy porous substance composed of polyol and isocyanate, and can be divided into two types: soft and hard. However, soft polyurethane foam is used as a cushioning material such as a pad. For use, rigid polyurethane foam is mainly used as a heat insulating material. Among them, the present invention relates to a polyurethane foam used as a heat insulating material, and a method for producing a polyurethane foam used mainly as a cold insulation ma...

AI Technical Summary

Problems solved by technology

[0007] However, in the conventional method for producing a polyurethane foam with a fiber mat, the fiber mat is supplied while maintaining the strong cohesive force between the glass fibers, and the polyurethane stock solution is impregnated, so the polyurethane stock solution is difficult to penetrate into the fiber mat. Therefore, there is an air layer in the polyurethane foam produced in this way, and there is a problem that the strength and cold insulation effect of the product are reduced.

[0008] In addition, when the wire bundles in the conventional polyurethane foam cannot be uniformly dispersed, the mechanical strength and thermal insulation effect of some parts will be reduced, which will cause shrinkage, cracking, twisting, etc.

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