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How to use the hot melt adhesive shape to distinguish between different kinds of hot melt adhesive

2021-12-27 14:07:03
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1. Block and granular hot melt adhesive

This hot melt pellet has a large yield. Block-like ones are square, round blocks, and grainy ones are flat, diamond-shaped, and cylindrical. Colors are yellowish, white, red, black or translucent colorless. When using, there should be a molten glue pan, which is scraped, rolled, sprayed or extruded after melting. 


Second, the rod hot melt adhesive

Usually 150-300mm long round rod-shaped glue strip, the glue tool is the end of the hot melt gun glue strip inserted into the barrel, after the hot melt hand pulls the trigger, the glue strip is pushed forward, while extruded the melt. This glue is yellow, white, red, or colorless and transparent, mainly used to bond metals, electronic products, plastic parts and toys. 


Third, powdered hot melt adhesive

Most of them are used for fabrics and liners, and the "coating" of glue must be realized through the powder sprinkler. When bonding, the adhesive lining material and other substrates are superimposed, and by hot pressing, a tight bond can be achieved. Such as clothing with adhesive lining, carpet backing, leather shoe padding. The pulverization of hot melt adhesive is difficult, because the friction and heat during mechanical pulverization will appear sticky blocks, and chemical pulverization and cryogenic mechanical crushing methods need to be used. Most of the colors are natural colors.


Fourth, thin film hot melt adhesive 

The hot melt adhesive is extruded into a film sheet into a roll, which is cut to the desired size in time, and the high bond strength can be achieved by hot pressing between the substrates. Adhesive films can also be combined with heat-curing ingredients such as epoxy resins or crosslinkers. Transparent adhesive films are used in the manufacture of automotive laminated safety glass and solar cell encapsulation. They have polyammonia vinegar film, polyvinyl butyral film, EVA film. There is no need for transparent adhesive film for the bonding of plates on cars and aircraft.


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