• Hyden Plastics P Limited

Hotmelt Coater – Roll To Roll

Hyden Plastics offers a roll to roll hotmelt coater. The use of hotmelts as a bonding adhesive in the industry has been transformed over the past few years and is gradually replacing conventional solvent or water-based systems and flame lamination. This machine uses the old technique of gravure coating, whose versatility has been increased by recent technology developments. A gravure roll has been adopted to accurately carry out the coating of hotmelt (pressure\heat sensitive) adhesive using an extremely small amount of material. This results in stable bead, which when combined with lamination application gives very good quality and a constant coating weight. The absence of solvents, volatile parts and water, offers an environmentally friendly operating process, and since no additional heating energy is required to evaporate water or solvent and the curing takes place by ambient air temperature or by the humidity of the ambient air, no drying or curing ovens are necessary. The gravure of the roller exactly determines the desired uniform add-on and the pattern on the substrate. This is required for minimum coating weights, good bonding strength and soft touch. A tremendous choice of gravures allows an optimal selection of coating patterns and weights. The coating patterns range from regular geometric patterns to random dots and nets and other optical effects. Advantages of this system are: easy to operate; minimal equipment set-up; simple coating supply system; and no special gravure pattern required. Disadvantages of this system are: no gravure wear compensation; large amounts of coating circulating in pan; increased open surface allows for heat loss; and accurate lamination made possible at 20 and 25 m/min.