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Hot melt should be warmed up before use. When the hot-melt adhesive is heated, the temperature must be strictly controlled, and the heating temperature of the hot-melt adhesive has a close relationship with the fluidity and adhesive tension of the adhesive. According to foreign data reports, when the hot melt adhesive is heated to 170°C, the adhesive pull force can reach (8.83±0.44)N/cm; when the temperature rises to l80°C, the adhesive pull force decreases to (7.33±0.33)N/ Cm; When the temperature of the glue drops to 155°C, the bonding tension is only (5±0.25) N/cm. It can be seen 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 bond strength decreases. On the other hand, if the temperature is too low, although the viscosity of the glue rises, the flowability of the glue decreases, and the pages cannot be firmly bonded to each other, resulting in degumming and loosening, which affects the binding quality of the book. The heating temperature and the sizing temperature of the hot melt adhesive must be controlled within the range of 170-180°C.
Why strict control of hot melt adhesive heating and gluing temperature
Why do you need to strictly control the heating and gluing temperature when using hot melt adhesives?