Why strictly control the heating and gluing temper

2022-08-06
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Why strictly control the heating and gluing temperature of hot melt adhesive

why strictly control the heating and gluing temperature when using hot melt adhesive

hot melt adhesive shall 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 bonding tension of the adhesive. According to foreign data, 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 L80 ℃, the bonding tension decreases to (7.33 0.33) n/cm; When the glue temperature drops to 155 ℃, the bonding tension is only (50.25) n/cm. Thus, the heating temperature of hot melt adhesive should not be too high or too low. If the temperature is too high, the fluidity, wettability and permeability will increase, but the bond strength will decrease. On the contrary, 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 bonded. As a result, the cost of glue and loose pages will be reduced, which will affect the binding quality of books. The heating temperature and gluing temperature of hot melt adhesive must be controlled within the range of 170 ~ 180 ℃

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