Polyamide hot melt adhesive rod manufacturing process

Abstract

The invention relates to a polyamide hot melt adhesive rod manufacturing process which uses extrusion molding equipment. The extrusion molding equipment comprises a bottom plate, a vertical plate, a driving device, an extrusion device and a molding device. The specific process flow of the extrusion molding equipment for manufacturing a polyamide hot melt adhesive rod is as follows: raw material proportioning, melting and stirring, extrusion molding, cooling, setting, slitting and packaging. The extrusion molding equipment adopts a double-station design, can continuously perform extrusion action, improves the working continuity, eliminates the problems of low working efficiency and poor extrusion continuity of a plunger type extruder, can shunt and stir raw materials in the molding process,improves the heating uniformity of the raw materials, and guarantees the unification of the plasticizing degree of raw materials of the same batch, corresponding parts do not need to be dismounted when a piston head needs to be lubricated, the workload of workers is relieved, and operation convenience is improved.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a polyamide hot-melt glue stick manufacturing process. Background technique [0002] Polyamide hot melt adhesive, also known as dimer acid polyamide hot melt adhesive, is formed by condensation reaction of dimer acid and polyamine at high temperature. It has excellent heat resistance, cold resistance, electrical properties, oil resistance, chemical resistance and Medium properties, often made into a rod-shaped structure, can be used for bonding solids such as wood, plastic, fiber, fabric, metal, etc., and can be widely used in factory production and processing and family daily life. [0003] The manufacture of polyamide hot-melt glue sticks needs to go through the steps of batching, stirring, extrusion, pulling, cooling, etc. Among them, the extrusion of glue sticks is the most critical step, which directly affects the quality of glue sticks after molding. Extruders for manufact...

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Problems solved by technology

[0004] (1) The piston in the plunger extruder needs to perform reciprocating linear motion during the extrusion process. If things go on like this, the wear on the piston will be greater, so the piston needs to be lubricated regularly. Since the piston is installed inside the equipment, the equipment needs to be cleaned first Lubrication can only be carried out after the machine is shut down and the corresponding parts are removed. The overall operation steps are cumbersome and the workload is large.

[0005] (2) The viscosity of the raw material is still high after being heated and softened, the flow rate of the raw material close to the inner wall of the heating barrel is slow, and the flow rate of the raw material far away from the inner wall of the heating barrel is fast, resulting in long heating time and high temperature of the raw material near the inner wall of the heating barrel, The short heating time and low temperature of the raw materials far away from the inner wall of the heating barrel lead to inconsistent plasticization degree of the same batch of molten materials, and the phenomenon of "cooking" occurs, and the quality of the molded products cannot be guaranteed.

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