Non-gusseted expansible envelope
First Claim
1. A non-gusseted expansible envelope comprising a one piece blank including a substantially rectangular rear panel, a front panel foldably attached thereto along a transverse fold line, a closure flap foldably attached to the front panel along another transverse fold line and two pairs of equally sized and shaped side seam flaps foldably attached respectively to the side edges of the front and rear panels along a pair of longitudinal fold lines, the improvement wherein the side seam flaps attached to the side edges of the front panels are each applied with longitudinal perforated lines which substantially bisect the flaps to form outer portions for the application of adhesive and to provide hinge connections which enable the side seam flaps to be folded inwardly upon themselves when the envelope is expanded.
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Accused Products
Abstract
The non-gusseted, side seamed expansible envelope of the present invention comprises a back panel, front panel and closure flap prepared from a single blank of paper or the like. The side seams are formed from a first pair of flaps foldably attached to the ends of the back panel and a second pair of flaps foldably attached to the ends of the front panel. Each of the side seam flaps are applied with diagonally oriented perforated lines that are located equidistant from the score line separating the front and back panels, and the second pair of side seam flaps are also applied with longitudinally oriented perforated lines which together with the diagonally oriented perforated lines provide the expansion characteristics of the envelope.
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Citations
6 Claims
- 1. A non-gusseted expansible envelope comprising a one piece blank including a substantially rectangular rear panel, a front panel foldably attached thereto along a transverse fold line, a closure flap foldably attached to the front panel along another transverse fold line and two pairs of equally sized and shaped side seam flaps foldably attached respectively to the side edges of the front and rear panels along a pair of longitudinal fold lines, the improvement wherein the side seam flaps attached to the side edges of the front panels are each applied with longitudinal perforated lines which substantially bisect the flaps to form outer portions for the application of adhesive and to provide hinge connections which enable the side seam flaps to be folded inwardly upon themselves when the envelope is expanded.
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6. A method of making and expanding a non-gusseted expansible envelope from an envelope blank having inner and outer surfaces comprising an aligned rear panel, front panel and closure flap separated from one another by transverse score lines, two pairs of equally sized and shaped side seam flaps foldably attached to the front and rear panels along spaced longitudinal score lines, a pair of longitudinally arranged perforated lines in the side seam flaps foldably attached to the front panel which form inner and outer portions thereof, and two pairs of diagonally oriented perforated lines in the side seam flaps symmetrically arranged around the score line separating the front and rear panels, comprising the steps:
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(a) arranging the envelope blank with its inside surface facing upwardly; (b) folding the side seam flaps about the spaced longitudinal fold lines to lie on the inside surface of said envelope blank; (c) applying adhesive to the side seam flaps attached to said front panels on the outer portions thereof defined by said longitudinally arranged perforated lines; (d) folding the rear panel over into face-to-face relation with the front panel to adhere the side seam flaps together; and
,(e) expanding the envelope by manually folding the outer portions of the perforated side seam flaps inwardly upon themselves to produce a non-gusseted expansible envelope.
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Specification