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The basic resin hot melt adhesive is ethylene vinyl acetate under high temperature and high pressure copolymerized, namely EVA resin. This resin is the main component of the hot melt adhesive production, the proportion of basic resin, quality determines the basic properties of the hot melt adhesive, such as adhesive bonding capacity, melting temperature and bond strength generally choose VA content 18-33, melt index (MI) 6-800, VA content is low, the high crystallinity hardness increases, VA content under the same circumstances, low crystallinity increase the flexibility of the, EVA melt index choice is also very important, melt index smaller flow of poor strength high melting temperature high of adherend wettability and permeability is poor. On the contrary, the melt temperature is lower and the bond strength is lower. The choice of the auxiliary agent, should choose the appropriate proportion of ethylene and vinyl acetate.