EVA hot melts are a thermoplastic hot melt. The term EVA is an abbreviation for Ethylene Vinyl Acetate. In addition to EVA, there is another common thermoplastic hot melt with very similar properties, that is the polyolefin, or metallocene hot melt. EVA is a copolymer adhesive that has long been used in the paper, packaging and assembly industries as they bond to a variety of porous materials and have a wide variety of formulations. The composition of the adhesive offers many possibilities to determine specific properties. The widely varying properties required have resulted in many different types of EVA hot melt available on the market.
Composition of EVA hot melts
Ethylene generally adheres well to non-polar substrates such as plastics including eg polyethylene. Vinyl acetate, on the other hand, adheres well to polar substrates such as paper. Moreover, vinyl acetate provides flexibility and an allround adhesion. Ethylene ensures good compatibility with other components, such as resin and wax
A large amount of vinyl acetate in the glue will make the glue stick well, but also set it slowly.
EVA hot melt adhesives have limited adhesion to adhesives, but are very fast and affordable, and therefore widely implemented in the industry. From packaging to the production of footwear, automotive parts and white goods. Most EVA hot melts are processed around 160 ℃, the bandwidth usually lies between a processing temperature of between 100 ℃ and 200 ℃. The viscosities, thickness, of the hot melt allow applications from spray and spray to rolling.