Method of forming plastic envelopes

Details Method of forming plastic envelopes Method of forming plastic envelopes

1981-10-13

1985-02-05

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156285, 156515, 226 95, 226195, B32B 3118

Patent

active

044976798

ABSTRACT:
The invention includes apparatus for and process of forming a plurality of plastic mounting envelopes from continuous plastic sheet material through cutting the plastic and bead sealing the margins by providing a high energy source to sever the plastic and bond the marginal edge of said plastic without physical contact.
The invention also includes said plastic envelopes to serve as mounts and protectors for receiving flat paper objects such as stamps, letters, etc.

REFERENCES:
patent: 2735797 (1956-02-01), Schjeldahl
patent: 3368930 (1968-02-01), Beason
patent: 4112799 (1978-09-01), Daenen
patent: 4345709 (1982-08-01), Barton

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