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US 4,308,988 AGranted
Envelope
OwnerJan Jiveman, Raymond Bengtsson +2inventors
InventorsJan Jiveman, Raymond Bengtsson, Rasit Kaya, Rune Bengtsson
Life of this patent
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OwnerJan Jiveman, Raymond Bengtsson +2inventors
InventorsJan Jiveman, Raymond Bengtsson, Rasit Kaya, Rune Bengtsson
Estimating the term…
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.
An envelope of plastic sheet material provided with a flap, the plastic sheet material being a thermoplastic sheet, which is laminated to a sheet of a hydrophilic material at least on a side forming an outside of the envelope, and the flap of the envelope being laminated to a paper layer at least on an inside of the flap, said layer supporting a gumming.
Dependencies are inferred from the claim text.