Microwave carton and blank for forming the same

• US 5,078,273 A
• Filed: 02/12/1991
• Issued: 01/07/1992
• Est. Priority Date: 02/12/1991
• Status: Expired due to Fees

• Current Assignee: Graphic Packaging International Incorporated
• Original Assignee: James River Corporation of Virginia (KOCH Industries Incorporated)
• Inventors: Kuchenbecker, Morris W.
• Primary Examiner(s): Elkins, Gary E.
• Application Number:
  US07/653,949
• Time in Patent Office: 329 Days
• Field of Search: 493/56, 493/63, 493/363, 493/364, 206/607, 206/611, 206/612, 206/625, 206/628, 229/902, 229/903, 229/906
• US Class Current: 229/207
• CPC Class Codes: B65D 5/542 the lines of weakness being provided in the container body
• CPC Class Codes: Y10S 229/924 Means to facilitate gripping a tear strip

Abstract

A carton and blank for forming the same are disclosed and includes a bottom panel, a top panel, side walls extending substantially perpendicularly away from the bottom panel toward the top panel with the side walls being connected to the bottom panel about a periphery thereof, and overlapping side walls extending substantially perpendicularly away from the top panel toward the bottom panel from predetermined peripheral edges of the top panel. An opening device is formed in the top panel for permitting access to an interior of the carton with the opening device including an opening force receiving mechanism in the form of a lifting tab is integrally formed in one of the overlapping side walls of the top panel for providing an initiation point for the opening device. Initial regions of weakness formed in the top panel extending from the lifting tab to respective peripheral edges of the top panel and continued regions of weakness are provided which extend from the initial regions of weakness substantially parallel to and including the respective peripheral edges of the top panel and extend toward a peripheral edge of the top panel which opposes the lifting tab wherein as previously mentioned, the continued regions of weakness include an inner partially cut score line of weakness and an outer perforated through cut line of weakness with the inner and outer lines of weakness extending substantialy parallel to one another such that a ply-separation occurs in the region between the respective lines of weakness when an opening force is applied to the lifting tab by the consumer. A device for facilitating the manipulation of the lifting tab is also disclosed.

Claims

1. A carton blank formed of a paperboard material for forming a paperboard carton, said blank comprising:

a first panel having side walls connected thereto by scored fold lines formed between a respective one of said side walls and a respective edge of said first panel;

a second panel having side walls connected thereto by scored fold lines formed between a respective side wall and an edge of said second panel, one of said side walls of said first panel one of said side walls of said second panel being congruent; and

an opening means formed in said second panel for permitting access to an interior of a carton formed from the blank, said opening means comprising;

an opening force receiving means integrally formed in one of said side walls of said second panel for providing an initiation of said opening means;

initial regions of weakness formed in said second panel extending from said opening force receiving means to respective peripheral edges of said second panel; and

continued regions of weakness extending from said initial regions of weakness substantially parallel to and including respective peripheral edges of said second panel to an edge of said second panel opposing said opening force receiving means;

wherein said continued regions of weakness include an inner partially cut score line of weakness and an outer perforated through cut line of weakness with said inner and outer lines of weakness extending substantially parallel to one another.

2. The blank as defined in claim 1, wherein said initial regions of weakness include inner and outer partially cut lines of weakness extending substantially parallel to one another.

3. The blank as defined in claim 2, wherein said opening force receiving means includes foraminations extending from a free edge of said one of said side walls of said second panel to a respective peripheral edge of said second panel, said respective peripheral edge, said free edge and said foraminations defining a lifting tab.

4. The carton as defined in claim 3, wherein respective lines of weakness forming said initial regions of weakness converge towards one another and intersect at said respective peripheral edge of said second panel adjacent said one of said side walls.

5. The carton as defined in claim 4, wherein the point of intersection of said lines of weakness is adjacent the termination of a respective foramination.

6. The blank as defined in claim 3, further comprising means for facilitating the manipulation of said lifting tab.

7. The blank as defined in claim 6, wherein said means for facilitating the manipulation of said lifting tab includes at least one crease score line formed in a surface of said lifting tab.

8. The blank as defined in claim 7, further comprising an embossed line formed in a predetermined side wall of said first panel, said predetermined side wall being that side wall which underlies said lifting tab in the carton formed from the blank.

9. The blank as defined in claim 5, wherein said embossed line underlies said crease score line formed in said lifting tab.

10. The blank as defined in claim 9, wherein said crease score line formed in said lifting tab extends outwardly from an inner surface of said lifting tab and said embossed line extends outwardly from an outer surface of said predetermined side wall such that a portion of said crease score line contacts said embossed line thereby preventing the sealing of a portion of said lifting tab to said predetermined side wall.

11. The blank as defined in claim 10, wherein said lifting tab includes an intermediate crease score fold line extending substantially parallel to said respective peripheral edge and between said foraminations.

12. The blank as defined in claim 11, wherein there are two crease score lines formed in said lifting tab extending substantially parallel to one another between said free edge of said side wall of said second panel and said crease score fold line.

13. A method of forming a region of weakness in a paperboard blank comprising;

forming a first line of weakness in a first surface of the paperboard material; and

forming a second line of weakness in an opposing surface of the paperboard material substantially perpendicular to and offset from said first line of weakness defining a region of weakness therebetween;

wherein at least one of said lines of weakness is a perforated through cut line of weakness.

14. The method as defined in claim 13, further comprising the step of forming the paperboard blank into a carton, wherein the region of weakness forms an opening means in a panel of the carton for gaining access to an interior of the carton.

15. The method as defined in claim 14, further comprising the step of forming a pair of regions of weakness in said panel of the carton, wherein said pair of regions of weakness form said opening means.

16. A carton for containing a product placed therein, said carton comprising:

a bottom panel;

a top panel;

side walls extending substantially perpendicularly away from said bottom panel toward said top panel, said side walls being connected to said bottom panel about a periphery thereof;

overlapping side walls extending substantially perpendicularly away from said top panel toward said bottom panel from predetermined peripheral edges of said top panel; and

an opening means formed in said top panel for permitting access to an interior of the carton, said opening means comprising;

an opening force receiving means integrally formed in one of said overlapping side walls of said top panel for providing an initiation of said opening means;

initial regions of weakness formed in said top panel extending from said opening force receiving means to respective peripheral edges of said top panel; and

continued regions of weakness extending from said initial regions of weakness substantially parallel to and including said respective peripheral edges of said top panel toward a peripheral edge of said top panel opposing said opening force receiving means;

wherein said continued regions of weakness include a partially cut score line of weakness formed in an inner surface of said top panel and a perforated through cut line of weakness formed in said top panel with said lines of weakness extending substantially parallel to one another.

17. The carton as defined in claim 16, wherein said initial regions of weakness include inner and outer partially cut lines of weakness extending substantially parallel to one another.

18. The blank as defined in claim 16, wherein said opening force receiving means includes foraminations extending from a free edge of said one of said overlapping side walls of said top panel to a respective peripheral edge of said top panel, said respective peripheral edge, said free edge and said foraminations defining a lifting tab.

19. The carton as defined in claim 18, wherein respective lines of weakness forming said regions of weakness converge towards one another and intersect at said peripheral edge of said top panel adjacent said one of said overlapping panels.

20. The carton as defined in claim 19, wherein the point of intersection of said lines of weakness is adjacent the termination of a respective foramination.

21. The carton as defined in claim 18, further comprising means for facilitating the manipulation of said lifting tab.

22. The carton as defined in claim 21, wherein said means for facilitating the manipulation of said lifting tab includes at least one crease score line formed in a surface of said lifting tab.

23. The carton as defined in claim 21, further comprising an embossed line formed in a predetermined side wall of said bottom panel, said predetermined side wall being that side wall which underlies said lifting tab in the carton formed from the blank.

24. The carton as defined in claim 23, wherein said embossed line underlies said crease score line formed in said lifting tab.

25. The carton as defined in claim 24, wherein said crease score line formed in said lifting tab extends outwardly from an inner surface of said lifting tab and said embossed line extends outwardly from an outer surface of said predetermined side wall such that a portion of said crease score line contacts said embossed line thereby preventing the sealing of a portion of said lifting tab to said predetermined side wall.

26. The carton as defined in claim 25, wherein said lifting tab includes an intermediate crease score fold line extending substantially parallel to said respective peripheral edge and between said foraminations.

27. The carton as defined in claim 26, wherein there are two crease score lines formed in said lifting tab extending substantially parallel to one another between said free edge of said side wall of said top panel and said crease score fold line.

31. The device as defined in claim 26, wherein there are two crease score lines formed in the lifting tab extending substantially parallel to one another between the free edge of the lifting tab and said crease score fold line.

28. A device for facilitating the manipulation of a lifting tab of a paperboard carton comprising:

at least one crease score line formed in a surface of the lifting tab; and

an embossed line formed in a surface of an underlying panel, said embossed line positioned so as to underlie at least a portion of said crease score line such that a portion of said embossed line contacts said portion of said crease score line thereby preventing the sealing of a portion of the lifting tab to the underlying panel.

29. The device as defined in claim 28, wherein said crease score line extends outwardly from an inner surface of the lifting tab and said embossed line extends outwardly from an outer surface of the underlying panel.

30. The device as defined in claim 29, wherein the lifting tab includes an intermediate crease score fold line extending substantially parallel a free edge of lifting tab and between foraminations forming the lifting tab.