| abstract |
The present invention relates to a method and a device for rapidly stress relieving laminated RFID cards sheets ( 1 ) or individually cut cards ( 2 ) so that the effect of card wrap, bending and distortion is reduced. A freezer tunnel ( 5 ) is located down-stream of a laminator machine. The freezer tunnel ( 5 ) uses nozzles ( 8 ) to supply a cryogenic liquid in vaporized form. Laminated RFID card sheets ( 1 ) are transported through the freezer tunnel ( 5 ), where they are exposed to an ambient temperature between −40° C. to −100° C. during two minutes or less. |