Why should the heating and gluing temperature be strictly controlled when using hot melt adhesive? The hot melt adhesive should be preheated before use. When the hot melt adhesive is heated, the temperature should be strictly controlled. The heating temperature of the hot melt adhesive is closely related to the fluidity and adhesive pulling force of the adhesive. According to foreign data reports, when the hot melt adhesive is heated to 170 ℃, the bonding tension can reach (8.83 ± 0.44) N / cm; when the temperature rises to 180 ℃, the bonding tension drops to (7.33 ± 0.33) N / cm; when the adhesive temperature drops to 155 ℃, the bonding tension is only (5 ± 0.25) N / cm. This shows that the heating temperature of the hot melt adhesive should not be too high or too low. If the temperature is too high, although the fluidity, wettability, and permeability increase, the bonding strength will decrease. Conversely, if the temperature is too low, although the viscosity of the glue increases, the fluidity of the glue decreases, and the pages cannot be firmly adhered to each other, causing degumming and loose pages, which affects the quality of book binding. The heating temperature and gluing temperature of hot melt adhesive must be controlled within the range of 170 ～ 180 ℃.
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