Envelopes – wrappers – and paperboard boxes – Paperboard box – A sidewall includes a horizontally or downwardly extending...
Reexamination Certificate
2000-07-10
2001-07-24
Elkins, Gary E. (Department: 3727)
Envelopes, wrappers, and paperboard boxes
Paperboard box
A sidewall includes a horizontally or downwardly extending...
C229S125350, C229S164000, C229S186000
Reexamination Certificate
active
06264099
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a packaging carton, in particular to a packaging carton having a which has flange, on the upper face of which a sealing cover such as a transparent film can be bonded by fusion or adhesion with adhesives, so that it can be manufactured inexpensively and efficiently.
2. Description of the Related Art
Packaging cartons are traditionally manufactured by forming a sheet of film material, synthetic paper, or resin material with a forming tool. This manufacturing method requires an expensive forming tool which, when various kinds of packing cartons are manufactured, must be individually provided for each kind of the packing carton requiring much time and a large financial burden. In order to avoid this disadvantage, there is a method by which a packaging carton is provided by cutting a quadrilateral sheet from a strip sheet of film or paper conveyed in the longitudinal direction; providing the quadrilateral sheet with a first, second and third outward folding lines, a first, second and third inward folding lines, and angled inward folding lines; and folding the quadrilateral sheet to form a tray having a stepped flange around the periphery of the tray (JP-A-6-72425).
Moreover, there is a packaging technique in which a tray carton having a flange around the periphery thereof, is folded up from a carton blank cut in a specified shape (JP-A-60-240444 and U.S. Pat. No. 4,636,187, both being foreign applications of U.K. Patent 2158392).
However, the packaging cartons disclosed in the above patent documents have following drawbacks. In the former, the carton is formed with a flange being stepped without being formed to be flat making it difficult to bond a sealing cover, such as a transparent film, by fusion or adhesion with adhesives. In the latter, the periphery of the carton blank must be cut in a specified shape for the folded up tray to provide a flange around the periphery thereof, which may cause chips of the carton blank to enter inside the tray carton. This makes the tray carton unsuitable as a packaging carton for packing foods.
The present invention was made in order to eliminate the above drawbacks with an object of providing a packaging carton which has a flat formed flange on the upper face of which a sealing cover such as a transparent film can be bonded, and can be inexpensively manufactured with high efficiency.
SUMMARY OF THE INVENTION
In order to achieve such object, a packaging carton according to the first aspect of the present invention is made by folding a quadrilateral sheet in a polyhedron with the specified length, width and height with a flat flange provided around a periphery thereof.
The quadrilateral sheet comprises: four inward folding lines each being formed to pass two of four corner points of a bottom plane of the polyhedron having the specified length and width; and four outward folding lines each being formed to be in parallel with each of the four inward folding lines with a distance therefrom equal to the specified height, and to have a length equal to a distance between the two of the four corner points on the inward folding line in parallel therewith.
In a region formed at each of four corners of the quadrilateral sheet between two of the four side planes formed between the four inward folding lines and the four outward folding lines, respectively, the region comprises: three outward folding lines forming a triangle extending from a vertex at one of the corner points; two outward folding lines each being formed to extend from each of the other two vertices of the triangle in parallel with one of the four outward folding lines forming the side plane beyond the rest of the other two vertices; and two inward folding lines each being formed to extend from an end of one of the four outward folding lines forming one of the side planes to one of the other two vertices near the end.
A packaging carton according to the second aspect of the present invention is made by folding a quadrilateral sheet in a polyhedron with the specified length, width and height with a flat flange provided around a periphery thereof.
The quadrilateral sheet comprises: four inward folding lines each being formed to connect two of four corner points of a bottom plane of the polyhedron having the specified length and width; and four outward folding lines each being formed to be in parallel with each of the four inward folding lines with a distance therefrom equal to the specified height.
In a region formed at each of four corners of the quadrilateral sheet including each of the four corner points, the region comprises: two inward folding lines which extend from one of the corner points to the ends of the two of the four outward folding lines near the corner point, respectively; one inward folding line which connects the ends of two of the four outward folding lines near the corner point; one outward folding line dropped from the corner point as a vertex of a triangle, formed with the two inward folding lines and the one inward folding line, to the one inward folding line as a base so as to divide the triangle into two; two inward folding lines each extending from each of the other two vertices of the triangle in parallel with one of the four outward folding lines extended to the end as the rest of the other two vertices; and two outward folding lines each extending from an end of the one outward folding line on the one inward folding line as the base in parallel with one of the four outward folding lines extended to the one of the other two vertices beyond the other of the two outward folding lines.
According to the forms of the packaging cartons in the first and second aspects, a quadrilateral sheet is cut out from a strip sheet of film or paper conveyed in the longitudinal direction. From the quadrilateral sheet, a packaging carton, having a flattened flange on the upper face of which a sealing cover such as a transparent film can be bonded, can be inexpensively manufactured with high efficiency.
Moreover, a packaging carton according to the third aspect of the present invention is made by folding a quadrilateral sheet in a polyhedron formed to have a bottom plane with specified length and width, a pair of facing long side planes each with a specified long height, a pair of facing short side planes each with a specified short height, two pairs of facing inclined side planes each being in the form of a triangle formed between the long side plane and the short side plane with one side connected to the long side plane, one of the other two sides connected to the short side plane and one vertex between the above sides being at each of four corner points of the bottom plane, and a flange formed with a continuous face and provided around a periphery.
The quadrilateral sheet comprises: two first inward folding lines, each formed to pass two of four corner points of a bottom plane of the polyhedron having the specified length and width, and to have a length equal to a sum of the specified width, twice the specified short height, and twice the width of the flange; two second inward folding lines, each formed to cross the two first inward folding lines at right angles to connect two of the four corner points, and to have a length equal to the specified length; two outward folding lines each being formed to have a length equal to the specified length between two of the four corner points and to be in parallel with one of the second inward folding lines with a distance therefrom equal to the specified short height; two pairs of inward folding lines each line extending from each end of the second inward folding line at one of the four corner points, and forming the one side of the triangle connected to the one of the long side planes; two pairs of outward folding lines each pair extending from both ends of each pair of the inward folding lines in parallel with the second inward line; and two outward folding lines each being formed to have a length equal to a distance between the two pairs of the outward fold
Moriya Akira
Sakuma Kouichi
Elkins Gary E.
Lorusso & Loud
Suzuki Manufacturing, Ltd.
LandOfFree
Packaging carton does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Packaging carton, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Packaging carton will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2496203