About an introduction to the composition and process of EVA hot melt adhesive
Author: source: Datetime: 2018-07-19 09:53:54
In recent years, with the rapid development of electronic products, construction industry, clothing decoration, shoe industry, automobile, household products and other industries, hot melt adhesive is a new type of adhesive. Because of its strong adhesive force, tasteless and pollution-free, no heating and curing, convenient operation and convenient storage. So it gets people's favor. So, do you know about the composition and technology of EVA hot melt adhesive?
Type EVA hot melt adhesive is a hot melt adhesive based on ethylene vinyl acetate random copolymer (EVA). It is one of the most important hot adhesive varieties, accounting for about 80% of the total amount of hot melt adhesive. It can be used in packaging materials, book binding, wood processing and other industries. The main components of EVA type hot melt adhesive are: EVA polymer, tackifier resin, wax, antioxidant and other fillers. EVA hot-melt adhesive strip production process is as follows:
①According to the ratio of hot melt adhesive, the raw materials are weighed and added to the reactor (or kneader). The heating system is heated to melt and stir evenly. By pumping a vacuum, the bubbles in the glue are removed.
②The rubber material which is melted in the reaction kettle is passed through the feed pump, through the filter system into the stirring storage tank, cooling to a constant temperature after a certain temperature, and through the pump to enter the screw extruder.
③The extruded rubber strips are cooled in the cooling water tank and drawn by the traction granulator. The output speed and the traction speed are controlled by the frequency converter to keep them in sync. The size and length of the rubber strip are controlled by the extrusion hole and cutting speed.
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