Apparatus for thermally machining thermoplastics sheet

Details Apparatus for thermally machining thermoplastics sheet Apparatus for thermally machining thermoplastics sheet

1975-09-29

1976-09-21

Coan, James F.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

93DIG1, 156380, 219121LM, B31B 116, B31B 164

Patent

active

039812308

ABSTRACT:
An apparatus for thermally machining thermoplastics sheet, i.e. cutting and/or welding the sheet, uses a laser. The sheet is tensioned over a backing member of a suitable refractory material such as fused silica. The laser beam is focussed on the sheet over the backing member and the laser energy passing through the sheet is absorbed in the surface layers of the backing member which is highly absorbing at the laser output wavelength. The material of the backing material also has a low thermal diffusivity so that a hot spot is formed at the point where the focussed laser beam is incident. Because the sheet is held in intimate contact with the backing member, heat from the hot spot passed back into the sheet to aid machining.

REFERENCES:
patent: 3004881 (1961-10-01), Van der Meulen
patent: 3247041 (1966-04-01), Henderson
patent: 3419706 (1968-12-01), Lohrmann
patent: 3626143 (1971-12-01), Fry
patent: 3838631 (1974-10-01), Simpson et al.
patent: 3909582 (1975-09-01), Bowen

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