Fifth, preheating of hot melt adhesive
The hot melt adhesive should be preheated before use. When it is preheated, the solid hot melt adhesive is poured into the preheated glue pan, heated at a temperature of about 160-200° C., preheated for about 12 hours, and the heating temperature is reached. After the liquidity is good, hold the preheated hot melt adhesive into a plastic tank with a machine of 160-180°C for normal start-up. The heating temperature of the hot melt adhesive is closely related to the fluidity and adhesive strength of the adhesive. Therefore, when the hot melt adhesive is heated, the temperature must be strictly controlled. The heating temperature should not be too high or too low, and the temperature range should be strictly controlled within the technical parameters provided by the manufacturer. General hot melt adhesive heating temperature and sizing temperature should be controlled in the range of 170-180 °C. If the temperature is too high, the fluidity is very good, and the permeability to the pages is also strong, but the bond strength will decrease; the temperature is too low, the bond strength will rise, but the fluidity of the glue will decrease, and the pages will not be firm. Adhesion, limb removal, loose-leaf quality problems. If the hot-melt adhesive temperature exceeds 200°C, the hot-melt adhesive may be carbonized and cracked. Hot melt adhesive should not be put for a long time, try to avoid repeated melting and solidification.
The hot melt adhesive should be preheated before use. When it is preheated, the solid hot melt adhesive is poured into the preheated glue pan, heated at a temperature of about 160-200° C., preheated for about 12 hours, and the heating temperature is reached. After the liquidity is good, hold the preheated hot melt adhesive into a plastic tank with a machine of 160-180°C for normal start-up. The heating temperature of the hot melt adhesive is closely related to the fluidity and adhesive strength of the adhesive. Therefore, when the hot melt adhesive is heated, the temperature must be strictly controlled. The heating temperature should not be too high or too low, and the temperature range should be strictly controlled within the technical parameters provided by the manufacturer. General hot melt adhesive heating temperature and sizing temperature should be controlled in the range of 170-180 °C. If the temperature is too high, the fluidity is very good, and the permeability to the pages is also strong, but the bond strength will decrease; the temperature is too low, the bond strength will rise, but the fluidity of the glue will decrease, and the pages will not be firm. Adhesion, limb removal, loose-leaf quality problems. If the hot-melt adhesive temperature exceeds 200°C, the hot-melt adhesive may be carbonized and cracked. Hot melt adhesive should not be put for a long time, try to avoid repeated melting and solidification.
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