초록 ▼

A square bottom plastic bag is designed to stand upright when opened. The bags are constructed with open tops, side handle openings and attached headers or with t-shirt style handles. The bags are produced in registered bag stacks and include means for adhering a rear surface of one bag to a front s

A square bottom plastic bag is designed to stand upright when opened. The bags are constructed with open tops, side handle openings and attached headers or with t-shirt style handles. The bags are produced in registered bag stacks and include means for adhering a rear surface of one bag to a front surface of a subsequent bag to make the bags self-opening when used with a dispensing rack. The headered bags have tear-off headers or headers with weakened areas that will rupture upon dispensing. The t-shirt bags have apertures through the handles to suspend the bags on a rack or a header attached above the handles. The bags have detachable or rupturable center tabs. The bags are registered with hot pins or cold stakes through an upper portion of the bags or bag handles. The bags have openings, microperforations, or are formed of porous material to dissipate heat or moisture.

대표청구항 ▼

1. A square bottomed plastic bag stack, comprising:a plurality of stacked polyethylene film bags, each of said bags comprising front and rear polyethylene film walls, each of said front and rear walls having first and second side edges, a top edge and a bottom edge;each of said bags having a pair of

1. A square bottomed plastic bag stack, comprising:a plurality of stacked polyethylene film bags, each of said bags comprising front and rear polyethylene film walls, each of said front and rear walls having first and second side edges, a top edge and a bottom edge;each of said bags having a pair of longitudinally oriented side gussets attached to said first and second side edges;each of said bags having a flat, rectangular bottom formed of lower portions of said front and rear walls and lower portions of said side gussets;lower corners of said each side gusset being folded outwardly and together to form downward pointing triangular panels;said triangular panels being folded inwardly from said side gussets;lower portions of said front and rear walls being folded inwardly and sealed together to form the bag bottom;said bag bottom being sealed to said side gussets adjacent upper edges of said triangular panels;said triangular panels being sealed to an upper surface of said bag bottom;each of said bags being folded inwardly at said side gussets and upwardly from either of said front wall and said rear wall at a point spaced upwardly from said bottom edge, to form a flattened bag;said bags being stacked upon one another and held in registration by attachment of said bags to one another, thereby forming a registered bag stack; andwhereby, when said bags are pulled from said bag stack and opened, they will stand erect upon said flat bottom.2. A square bottomed header bag stack, comprising:a plurality of stacked polyethylene film bags, each of said bags comprising front and rear polyethylene film walls, each of said front and rear walls having first and second side edges, a top edge and a bottom edge;each of said bags having a pair of longitudinally oriented side gussets attached to said first and second side edges;each of said bags having a crease line, said crease line being parallel to said bottom edges and spaced upwardly from said bottom edges by approximately one half of a width of one of said side gussets;each of said bags being slit from said bottom edges of said walls to said crease line at each intersection of said front and rear walls and said side gussets;each of said bags having a flat, rectangular bottom formed of lower portions of said front and rear walls and lower portions of said side gussets;lower corners of said each side gusset being folded outwardly to said crease line and together to form downward pointing triangular panels;said triangular panels being folded inwardly from said side gussets at said crease line;lower portions of said front and rear walls being folded inwardly from said crease line and sealed together to form a bag bottom;said bag bottom being sealed to said side gussets adjacent said crease line and upper edges of said triangular panels;said triangular panels being sealed to an upper surface of said bag bottom;each of said bags being folded inwardly at said side gussets and upwardly from either of said front wall and said rear wall at said crease line, to form a flattened bag;said bags being stacked upon one another and held in registration by attachment of said bags to one another, thereby forming a registered bag stack; andwhereby, when said bags are pulled from said bag stack and opened, they will stand erect upon said flat bottom.3. The square bottomed plastic bag stack as described in claim 1 or claim 2, wherein each of said bags is attached at said top edges of at least one of said front and rear walls to at least one header strip.4. The square bottomed plastic bag stack as described in claim 3 wherein said header strip is attached at said top edges of at least one of said front and rear walls by at least one perforation.5. The square bottomed plastic bag stack as described in claim 3 wherein said header strip has at least one hole for suspending said bags from a dispensing rack.6. The square bottomed plastic bag stack as described in claim 5 wherein said header strip includes at least one weakened area, said weakened area extending from said hole to an upper edge of said header strip.7. The square bottomed plastic bag stack as described in claim 1 or claim 2, further comprising:means for attaching an upper portion of said rear wall of a leading one of said bags to an upper portion of said front wall of a subsequent bag in said bag stack; andwhereby, when said leading bag is pulled from said bag stack, said subsequent bag will cause said leading bag to open.8. The square bottomed plastic bag stack as described in claim 7, wherein said means for attaching an upper portion of said rear wall of a leading one of said bags to an upper portion of said front wall of a subsequent bag in said bag stack is selected from the group comprising:glue spotting, corona treatment, pressure and corona treatment with pressure.9. The square bottomed plastic bag stack as described in claim 3, wherein said header strips are attached to one another with at least one hot pin extending through said headers to maintain the bags in registration.10. The square bottomed plastic bag stack as described in claim 3, wherein said header strips are attached to one another with at least one cold stake extending through said headers to maintain the bags in registration.11. The square bottomed plastic bag stack as described in claim 3, further comprising at least one handle opening, said handle opening extending through said front and rear walls in an upper portion of each of said bags.12. The square bottomed plastic bag stack as described in claim 1 or claim 2, wherein said bags are formed of a porous material.13. The square bottomed plastic bag stack as described in claim 1 or claim 2, wherein said bags are formed of material having microperforations penetrating at least a portion of any of said bag walls and side gussets.14. The square bottomed plastic bag stack as described in claim 1 or claim 2, wherein said bags have a plurality of ventilating openings penetrating at least a portion of any of said bag walls and side gussets.15. The square bottomed plastic bag stack as described in claim 1 or claim 2, wherein said bags further comprise:an upper seal, said upper seal joining said front wall to said rear wall at said top edges of said bag walls and joining top edges of said side gussets; anda U-shaped cutout, said cutout commencing at a first point on said upper seal spaced from said first side edge and extending downwardly toward said bottom edges, across an upper portion of said bag walls and upwardly to a second point on said upper seal spaced from said second side edge, thereby forming an open bag mouth and a pair of bag handles terminating at said upper seal.16. The square bottomed plastic bag stack as described in claim 15, wherein said bags are attached to one another with at least one hot pin extending through said bag handles to maintain said bags in registration.17. The square bottomed plastic bag stack as described in claim 15, wherein said bags are attached to one another with at least one hot pin extending through said upper portion of said bag walls to maintain said bags in registration.18. The square bottomed plastic bag stack as described in claim 15, wherein said bags are attached to one another with at least one cold stake extending through said bag handles to maintain said bags in registration.19. The square bottomed plastic bag stack as described in claim 15, wherein said bags are attached to one another with at least one cold stake extending through said upper portion of said bag walls to maintain said bags in registration.20. The square bottomed plastic bag stack as described in claim 15, wherein said bags further comprise a pair of apertures, each of said apertures penetrating said bag handles at a point spaced downwardly from said upper seal, said apertures permitting said bag stack to be suspended from a dispensing rack.21. The square bottomed plastic bag stack as described in claim 15, further comprising:a central tab, said central tab extending upwardly from at least one of said front wall and said rear wall at said open mouth; andsaid central tab having an opening therethrough for suspending said bag stack.22. The square bottomed plastic bag stack as described in claim 21, wherein said central tab is attached to at least one of said front wall and said rear wall at said open mouth at a weakened area, said weakened area permitting said central tab to be tom from said open mouth of said bag as said bag is removed from a dispensing rack.23. The square bottomed plastic bag stack as described in claim 21, wherein said central tab includes a weakened area, said weakened area extending from said opening to an upper edge of said central tab, said weakened area parting under pressure as said bag is removed from a dispensing rack.24. The square bottomed plastic bag stack as described in claim 15, further comprising at least one header strip, said header strip being attached above said upper seal.25. The square bottomed plastic bag stack as described in claim 24, wherein said header strip is attached above said upper seal with at least one perforation.26. The square bottomed plastic bag stack as described in claim 24, wherein said header strip has at least one hole therethrough for suspending said bag stack.27. The square bottomed plastic bag stack as described in claim 26, wherein said header strip includes a weakened area, said weakened area extending from said hole to an upper edge of said header strip, said weakened area parting as said bag is removed from a dispensing rack.