Apparatus for forming envelopes

Details Apparatus for forming envelopes Apparatus for forming envelopes

1975-02-27

1976-11-02

Simmons, David A.

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

With bending, folding, winding, or wrapping means

29204R, 156499, 156568, B65C 900

Patent

active

039895793

ABSTRACT:
An apparatus for forming envelopes from thermoplastic sheet material including means for feeding said sheets at predetermined intervals along a conveyor means, means for heating the thermoplastic sheet along a narrow transverse zone, means for moving the heated sheet into contact with a curved surface which is of such a configuration that the sheet is folded along the heated zone into an envelope, and means for heat sealing the envelope along the side edges thereof.

REFERENCES:
patent: 911070 (1909-02-01), Ranz
patent: 2064658 (1936-12-01), Grieb et al.
patent: 2373082 (1945-04-01), Staelin
patent: 2624106 (1953-01-01), Lund
patent: 2853839 (1958-09-01), Hermann
patent: 2998052 (1961-08-01), Roeber
patent: 3011935 (1961-11-01), Bodek et al.
patent: 3816219 (1974-06-01), Hurlbut et al.
patent: 3892620 (1975-07-01), Heussy

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