Treatment process for improving PUR reaction type hot melt adhesive production yield and jig thereof

Abstract

The invention discloses a treatment process for improving the PUR reaction type hot melt adhesive production yield and a jig thereof. The designed jig is used for heating a glue pipe filled with glue from the exterior of the glue liquid level; and the glue in the glue pipe is synchronously cooled, various faults, cracks, holes, broken lines, patterns and other defects are reduced, the production yield is increased to 94%-98%, and a qualitative leap is achieved compared with the situation that the yield in the industry is generally 70%-80%.

Description

technical field [0001] The invention relates to the field of viscose, in particular to a treatment process and a jig for improving the production yield of PUR reactive hot melt adhesives. Background technique [0002] Nowadays, a large number of electronic products and various daily necessities use glue (glue) to achieve bonding and sealing. Among them, PUR reactive hot melt adhesive has excellent bonding strength, temperature resistance and chemical corrosion resistance. The characteristics of anti-corrosion, aging resistance, cohesiveness and elasticity are easy to condition, and it has become a widely used glue. [0003] General PUR reactive hot-melt adhesive products are industrially produced by the factory, and an appropriate volume of heated glue is poured from bottom to top into a suitable size rubber hose, and then sealed and cooled to solidify. The rubber hose refers to the glue used to store glue The container, including the tube body, the bottom glue filling port...

AI Technical Summary

Problems solved by technology

[0004] However, during the glue filling process, due to the thinner rubber hose and the smaller glue filling port at the bottom, during the process of filling glue from the bottom glue port, the part of the glue that first enters the upper part has begun to enter the cooling process, and the glue that enters first The upper part of the glue touches the air at the top to further accelerate the heat dissipation, while the glue poured into the back is still in a higher temperature state, so that the cooling process of the glue in the front and the glue in the back is not synchronized, and the glue in the front gradually cools down. , the hotter glue in the back is still pouring in continuously; secondly, the glue near the outer shell of the hose is also cooled faster than the glue in the center of the hose. The difference makes the inside of the glue prone to creep (similar to the convection phenomenon, due to the high viscosity of the glue, thus forming a creep-like effect), the glue is prone to unevenness and pulling during the cooling process while creeping, and in the gradual cooling process These unevenness and pulling phenomena will remain in the glue and cool together, so the glue in the hose is prone to various flaws such as faults, cracks, holes, broken lines, window patterns, etc., and these flaws will eventually solidify, so it becomes a defective product ; Since most PUR reactive hot melt adhesive products are used in high-precision fields, such as mobile phones, displays, medical devices and other fields, various defects such as faults, cracks, holes, broken lines, and window patterns occur High-quality glue products cannot be used in these fields, and factories often can only scrap this type of defective products, resulting in the yield rate of PUR reactive hot-melt adhesives sealed with rubber tubes in the prior art generally at 70-80%, resulting in Large capacity loss and material waste

Images