Envelope

Details Envelope Envelope

1980-04-16

1982-01-05

Hall, George T.

Envelopes, wrappers, and paperboard boxes

Envelope

Closures

B65D 2714

Patent

active

043089887

ABSTRACT:
The invention relates to an envelope of plastic sheet material consisting of a thermoplastic sheet, which is laminated to a sheet of hydrophilic material at least on the side forming the outside of the envelope. The flap belonging to the envelope is laminated to a paper layer at least on its inside, said layer supporting a gumming. The invention also relates to a method for continuously making such envelopes, a web of a plastic sheet laminated according to the above being folded with its edge portions towards a central area, which is left free. One or more paper webs are laminated to this central area and punched-out areas are made in the central area to a desired shape of the flaps of the envelopes. The envelopes are thereafter sealed along their sides by means of transversal welding seams and separated from each other.

REFERENCES:
patent: 2374026 (1945-04-01), McKeen
patent: 2804395 (1957-08-01), Boyajian
patent: 3263904 (1966-08-01), Warp
patent: 3265289 (1966-08-01), Hiersteiner
patent: 3446421 (1969-05-01), Carrigan et al.

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