초록 ▼

A single blank is used to make an expandable envelope construction having four side edges which can expand as the envelope construction is filled to capacity. The blank is provided with horizontal and vertical score lines and fold lines which permit the sides and bottom of the construction to collap

A single blank is used to make an expandable envelope construction having four side edges which can expand as the envelope construction is filled to capacity. The blank is provided with horizontal and vertical score lines and fold lines which permit the sides and bottom of the construction to collapse inwardly while the pocket enlarges in thickness and decreases in height and width. The blank has side flaps with rounded comers at the ends which are overlaid by the back panel and closure panel in an unsecured manner to maintain the envelope in a sealed condition when expanded.

대표청구항 ▼

[ What is claimed is:] [1.]1. An expandable envelope construction comprisinga rectangular front panel having a horizontally disposed score line spaced from a bottom edge thereof, a horizontally disposed score line spaced from the top edge thereof, a vertically disposed score line spaced from one sid

[ What is claimed is:] [1.]1. An expandable envelope construction comprisinga rectangular front panel having a horizontally disposed score line spaced from a bottom edge thereof, a horizontally disposed score line spaced from the top edge thereof, a vertically disposed score line spaced from one side edge thereof, a vertically disposed score line spaced from another side edge thereof and a plurality of angularly disposed score lines, each said angularly disposed score line extending from an intersection of a respective horizontally disposed score line and a vertically disposed score line to a respective comer of said panel;a pair of side flaps at opposite sides of said front panel, each said flap being folded over said front panel along a vertical fold line therebetween and including a vertically disposed score line spaced from said fold line, each said flap including a first section extending from a respective vertical fold line and a reduced second section extending from said first section;a back panel extending from and folded over said front panel along a horizontal fold line therebetween, said back panel being secured to said second section of each of said flaps to define a pocket and having a horizontally disposed score line spaced from said fold line between said front and back panels, said back panel having a trapezoidal section extending from said horizontal fold line and disposed in overlying relation to said first section of each said side flap; anda closure flap extending from said front panel along a horizontal fold line therebetween for folding over said back panel and said first section of each said flap to close said pocket, said closure flap having a horizontally disposed score line spaced from said fold line between said closure flap and said front panel whereby upon insertion of materials into said pocket, said panels are expandable from each other to enlarge the thickness of said pocket while said pocket is maintained in a sealed condition.