Lamination Gum

In today’s market, properties expected out of packaging are phenomenal. To keep up with these ever growing market demands the industry has adopted laminating two or more substrate which allows advances packaging techniques.
The lamination is the process of bonding together two or more substrates together with the help of adhesives.
Earlier only solvent based adhesives were known and used. These adhesives are made up of two components adhesive and additives which are mixed using solvents as the carrier.
A typical example is polyester or BOPP is reverse printed and then laminated with LDPE. In this case printed polyester or BOPP is put on the primary unwinder then printed surface is passed through the coating head and adhesive is picked up. The substrate is then passed through the drying tunnel. Adhesive is dried to the extent that it becomes tacky. Heated air flow is used in the drying tunnel. All the solvents in the adhesive are removed by evaporation. This film is then brought to the nipping station where it is bound together with the secondary film. Nipping station consists of one chrome plated roller and one rubber roller. The chrome plated roller is heated from inside and the temperature is kept around 70 degree Celsius. This is done to keep the adhesive in tacky condition when bonding is taking place.