When using a Hot melt adhesive coating machine, the adhesive should be replenished in a timely manner, and the coating amount should be appropriately increased according to production requirements. Insufficient adhesive coating will reduce the bonding strength, eventually leading to failure in material lamination.

The coating amount on the substrate surface can be increased by selecting anilox rollers with deeper cells, adjusting the pressure of the rubber roller, or reducing the contact pressure between the doctor blade and the anilox roller. For plastic film substrates, corona treatment can be applied before coating to activate and roughen the substrate surface, thereby improving its adsorption capacity for adhesives and increasing the effective coating weight.

In addition, the selection and control of drying temperature are particularly critical. Only by properly controlling the drying temperature can the optimal performance of the hot melt adhesive coating machine be ensured. Either excessively high or excessively low temperature will affect the bonding fastness of the laminated film.

If the substrate is exposed to an overly high drying temperature or high-temperature sterilization, the surface layer of the adhesive will be carbonized, damaging its bonding performance. If the drying temperature is too low, the adhesive will not be fully cured, resulting in reduced viscosity and poor lamination strength. Moreover, bubbles are likely to form inside the laminated film after a period of storage, impairing the product lamination quality.