Methods and apparatus for laminating polymeric sheet material

Details Methods and apparatus for laminating polymeric sheet material Methods and apparatus for laminating polymeric sheet material

1987-04-22

1988-12-13

LaRoche, Eugene R.

Radiant energy

Irradiation of objects or material

1563796, G21G 500, G21K 500

Patent

active

047913037

ABSTRACT:
The present invention concerns methods and apparatus for laminating polymeric sheet materials wherein the use of a separate adhesive and/or the use of heat as a bonding means are avoided. In particular, methods and apparatus are disclosed wherein at least one polymeric sheet is exposed to a flowing of gaseous cold plasma to form free radicals on the surface thereof. Said free radicals serve to effect bonding upon application of such treated polymeric sheet to a second polymeric sheet. In preferred embodiments, approximately 180,000 to 500,000 volts of electromagnetic energy are applied to a stream of gaseous material, such as argon gas, and utilizing a radio wave frequency discharge of approximately 12.56 megaHertz. In some preferred embodiments, the cold plasma may be applied at an effective pressure of approximately 1.1 Torr in the reaction area.

REFERENCES:
patent: 3391044 (1968-07-01), Kaghan et al.
patent: 3870610 (1975-03-01), Baird et al.
patent: 4511419 (1985-04-01), Kuhlmann et al.

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