| abstract |
A method for the production of embossed laminar thermoplastic film structures comprising supplying a first length of a thermoplastic film onto the surface of a patterned roller, portions of which pattern are capable of absorbing infrared radiation, subsequently heating the patterned surface to raise the temperature of the film in those areas which are in contact with the infrared absorbent pattern, and finally superimposing a preheated film onto the film on the surface of the patterned roller to produce a laminar structure bonded together along a plurality of intersecting heat seal lines. |