| abstract |
In the adhesion of a first material coated with an activatable fusible adhesive to a second identical or different material to form a multiple-layer structure, the improvement which comprises using a fusible adhesive whose open time is between about 10 and 60 seconds, subjecting the adhesive-coated first material to pressure-free activation by infrared radiation at an activation time of about 0.5 to 10 seconds, and then pressing the first and second materials together without additional heat input. The fusible adhesive is preferably a copolyester or copolyester mixture and is activated by directing the infrared radiation at that face of the coated first material which carries the adhesive. Preferably, the adhesive is applied to the first material in a cross-lattice pattern, the quantity amounting to about 30 to 120 g/m2 and the open area amounting to about 50 to 70% of the total area. |