Hot melt labelling refers to the glue application on the label. As such, the same functionality exists as for the standard rotary labellers. Hot melt labelling is also a more cost effective application due to the minimum amount glue required to apply the label and excess glue is recycled back to a holding tank for re-use.
Hot melt glue systems can bond a larger array of materials such as plastics, acrylics, and certain metals. They typically have a higher level of bonding strength.
Below are some of the advantages for using a hot melt system
Clean. Contrary to the other processes with solvents, no dispersing agent is necessary for hot melt. It limits waste, emissions of volatile chemicals and makes it possible to save energy during the coating of the adhesive.
Rapid, precise, durable. Hot melt adhesives dry quickly and their strong adhesiveness allows for precise positioning of the label. The label will be durable and solid, whether it’s on glass, plastic or metal. Even on the most complex surfaces, the adhesive is rather strong so that the label remains in place. These adhesives are also resistant to heat, cold and water.
Invisible. “Hot melt” can be made to be transparent and therefore almost invisible on the product. Farewell to old glue that dulls the appearance of your packaging!
Approval. As these adhesives are not made from chemical solvents, they can be approved by the FDA, for example, and are safe when in contact with food.
The machine design also allows for dual label rolls to be fitted (in the event of rollfed), or multiple label magazines (in the event of precut labels) to prevent downtime for changeovers, where the machine automatically selects the next roll or magazine when the first is depleted. Changeover times are relatively short between container sizes and a wide variety of container sizes and label formats can be accommodated on the same machine.
Hotmelt systems can be used on rollfed labels (full wrap-around), but also on precut labels fitted in a label magazine inside the machine where the label is automatically picked, glued and placed on the bottle.