Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With work feeding or handling means
Reexamination Certificate
1999-10-01
2002-03-05
Yao, Sam Chuan (Department: 1733)
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With work feeding or handling means
C156S554000, C156S578000, C156S324000
Reexamination Certificate
active
06352096
ABSTRACT:
FIELD OF THE INVENTION
This invention is directed generally to carton blanks and apparatus and method for forming the carton blanks and more particularly to apparatus and method for forming carton blanks that can be used to form leakproof cartons.
BACKGROUND OF THE INVENTION
There are many supposedly leakproof cartons on the market today. These are formed using a variety of methods. Some of the cartons are designed to hold granular materials while others are designed to hold liquid materials. While some of these leakproof cartons have been successful, there is always a need for improvement.
BRIEF DESCRIPTION OF THE INVENTION
This invention provides a leakproof carton having inner upper and lower closure panels formed from a fluid impervious material and not secured to the top or bottom panels of the carton.
In a preferred embodiment of the invention, the carton blank comprises a unitary sheet of relatively rigid material having an inner surface, an outer surface, a left side edge, a right side edge, a top edge and a bottom edge, with the left and right side edges being perpendicular to the top and bottom edges. The unitary sheet of relatively rigid material has a plurality of cut and fold lines for dividing the unitary sheet of relatively rigid material into a plurality of sidewall panel portions, a glue tab panel portion, and top and bottom panel portions extending outwardly from said sidewall panel portions. A first sheet of relatively flexible material is superposed over the inner surface of the top panel portions and portions of said sidewall panel portions adjacent to the fold lines between them and the top panel portions and a portion of the inner surface of the glue tab panel portion. Securing means, extending continuously between said right side edge and said left side edge, are provided for sealing and securing a portion of the first sheet of relatively flexible material to the inner surface of the portions of said sidewall panel portions adjacent to the fold lines between them and the top panel portions and to the portion of the glue tab panel portion.
A second sheet of relatively flexible material is superposed over the inner surface of the bottom panel portions, and other portions of the sidewall panel portions adjacent to the fold lines between them and the bottom panel portion and another portion of the inner surface of the glue tab panel portion. Securing means, extending continuously between said right side edge and said left side edge, are provided for sealing and securing a portion of the second sheet of relatively flexible material to the inner surface of the other portions of the sidewall panel portions adjacent to the fold lines between them and to the another portion of the glue tab panel portion. The first sheet of a relatively flexible material has an upper edge, a central body portion and a lower edge and the first securing means secure portions of the central body portion adjacent to the lower edge to the portions of the sidewall panel portions and the portion of the glue tab panel portion. The second sheet of a relatively flexible material has an upper edge, a central body portion and a lower edge and the second securing means secure portions of the central body portion adjacent to the upper edge to the other portions of the sidewall portions and the another portion of the glue tab panel portion. The first and second sheets of relatively flexible material and at least the exposed portions of the inner surface are fluid impervious. The first and second sheets of relatively flexible material have surfaces formed from a fluid, impervious plastic material. In one embodiment of the invention, the plurality of sidewall panel portions comprise a back panel portion, a right side panel portion, a front panel portion and a left side panel portions and the glue tab panel portion extends outwardly form one of the left side and right side panel portions.
A carton is formed from the above described carton blank by folding the sidewall panel portions and the glue tab panel portion around the fold lines therebetween, securing the glue tab panel portion to one of the sidewall panel portions, sealing together the facing surfaces of the second sheet of relatively flexible material, folding the bottom panel portions into superposed relationship and securing them together, filling the carton with a desired material, sealing together portions of the facing surfaces of the first sheet of relatively flexible material and folding the top panel portions into superposed relationship and securing them together to form a leakproof carton. In one embodiment of the invention, the plurality of sidewall panel portions comprise a back panel portion, a right side panel portion, a front panel portion and a left side panel portion, and the glue tab panel portion is secured to the back panel portion. However, such one embodiment is for illustration purposes only and the carton blank can be of other configurations. The method further comprises securing the portions of said first and second sheets of relatively flexible material extending upwardly and downwardly from said glue tab panel portion to portions of the first and second sheets of relatively flexible material extending upwardly and downwardly from said the back panel portion.
In another preferred embodiment of the invention, the carton blank is the same as that described above except for the location of the first and second sheets of a relatively flexible material. The first sheet of a relatively flexible material has an upper edge, a central body portion and a lower edge and the first securing means secure portions of the central body portion adjacent to the upper edge to the portions of the sidewall panel portions and the portion of the glue tab panel portion. The second sheet of a relatively flexible material has an upper edge, a central body portion and a lower edge and the second securing means secure portions of the central body portion adjacent to the lower edge to the other portions of the sidewall panel portions and the other portion of the glue tab panel portion. The method of forming a carton from the another preferred carton blank comprises folding the remaining portion of the central body portion of the first sheet of relatively flexible material over the first securing means until the remaining portion is in superposed relationship over the first securing means, the top panel portions and the portion of the glue tab portion, folding the remaining portion of the second sheet of relatively flexible material over the second securing means portion thereof until the remaining portion is in superposed relationship over the second securing means, the bottom panel portions and the another portion of the glue tab panel portion, folding the sidewall panel portions and the glue tab panel portion around the fold lines therebetween, securing the glue tab panel portion to one of the sidewall panel portions, sealing together the lowermost portion of the facing surfaces of the second sheet of relatively flexible material, folding the bottom panel portions into superposed relationship and securing them together, filling the carton with a desired material, sealing together the uppermost portions of the facing surfaces of the first sheet of relatively flexible material and folding the top panel portions into superposed relationship and securing them together to form a leakproof carton.
In another preferred embodiment of the invention, the carton blank comprises a unitary sheet of a relatively rigid material, such as paperboard, having an inner surface and an outer surface and a left side edge, a right side edge, a top edge and a bottom edge with the left and right side edges being perpendicular to the top and bottom edges. The unitary sheet of relatively rigid material has a plurality of cut and fold lines for dividing the unitary sheet of relatively rigid material into a plurality of sidewall panel portions, a glue tab panel portion, and top and bottom panel portions extending outwardly from the sidewall panel portions. A first strip
Graphic Packaging Corporation
Kelly Joseph J.
Klaas, Law, O'Meara & Malkin, P.C.
O'Meara William P.
Yao Sam Chuan
LandOfFree
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