This invention relates to packaging cartons, blanks for making packaging cartons, and to a method of making a packaging carton.
Blanks for producing cartons are usually cut or stamped out of thin web of foldable material such as paperboard. An important consideration in the manufacture of blanks from the web material is to optimise the use of the web material, and reduce wastage wherever possible. The usual way of cutting out or stamping out the blanks is to feed a continuous web of the sheet material to a stamping machine and to stamp out successive identical blanks that sit side by side across the web. Often it is not possible to cover the maximum area of the available web material with the templates of the blanks.
An object of the present invention is to provide a carton fabricated from a carton blank with fastening means whereby the panels are held together after the blank is folded.
According to one aspect of the invention a carton formed from a blank cut from a flexible sheet of foldable material, the carton comprising a plurality of panels and flaps separated by fold lines that define edges of the panels at least one pair of adjacent flaps having at least one gusset panel hinged there between, at least one of said flaps being provided with a slot which is adapted for receiving the said at least one gusset panel whereby, said at least one gusset panel is retained by the slot thereby holding at least two of said panels of the carton together.
Preferably the carton comprises a linear series of panels for forming a tubular structure and at least one end closure panel hinged to first panel of said linear series of panels for at least partially closing an open end of the tubular structure and a first end closure flap hinged to a second panel adjacent said first panel and wherein the gusset panel is hinged to the first end closure flap for being received in the slot said slot being formed in a second and closure flap.
Preferably the second end closure flap is hinged to a side edge of the end closure panel.
Preferably the first end closure flap is disposed between the second end closure flap and said, second panel.
Preferably the gusset panel is disposed between and hinged thereto to the first end closure flap and a third end closure flap, said first end closure flap being folded into parallel relationship with the second panel and the third end closure flap being folded into parallel relationship with the end closure panel.
Preferably the end closure panel is secured to the third end closure flap.
Preferably the end closure panel is formed from a composite panel comprising a first part hinged to the first panel and second part hinged to a third panel, said first and second panel being secured in overlapping relationship.
Preferably the carton is a gable-end top carton, the slot being provided in an end flap that lies adjacent to a panel that forms a lower end panel of the carton, and the gusset is provided at a selected fold line that defines an upper edge of the lower side panel of the carton.
Preferably the end flap is folded so as to lie inside the lower end panel of the carton thereby to position the slot adjacent a corner of the carton so as to receive the gusset at the corner of the carton when the gusset is pushed into the slot.
Preferably the carton is cube shaped, the slot is provided in an end flap that is are folded to lie adjacent to a panel that forms a sidewall of the carton thereby to position the slot adjacent a corner of the carton, and the gusset is provided at a selected fold lines that defines an upper edge of the carton.
According to another aspect of the present invention there is provided a blank for forming a carton, comprising a plurality of panels and flaps separated by fold lines that define edges of the panels at least one pair of adjacent flaps having at least one gusset panel hinged there between, at least one of said flaps being provided with, a slot which is adapted for receiving the said at least one gusset panel whereby, said at least one gusset panel is retained by the slot thereby holding at least two of said panels of the carton together.
Preferably comprising, in sequence, a bottom flap, a bottom panel with end panels positioned laterally of the bottom panel, a first lower side panel, an upper side panel, a top panel, two top end panels placed laterally of the top panel, a second upper side panel and a lower side panel.
Preferably the bottom end panels each have two flaps and each of the flaps has a slot for receiving one of the gussets when the blank is folded to make a carton.
According to a third aspect of the present invention there is provided a method of manufacturing a packaging carton comprising the steps of:
Preferably a first flap of each of the one or more pairs of flaps is folded through an angle of 180° relative to the plane of the blank and thereby forms a folded gusset and holds the second flap of each pair of flaps in an upright position.
Preferably the carton blank comprises in sequence, a bottom flap, a bottom panel with end panels positioned, laterally of the bottom panel, a first lower side panel, an upper side panel, a top panel, two fop end panels placed laterally of the top panel, a second upper side panel and a lower side panel, and the steps of folding the blank about the fold lines forms a gable-end top carton.
An embodiment of the present invention will now be described, by way of example with reference to the accompanying drawings, in which:
Referring to drawings, and in particular to
From
The bottom end panels A1 and A2 each have a two side flaps 32 and 33, and each of the side flaps 32 and 33 has two slots 34 and two hooks 35 (see
Referring to
Referring now to
Referring to
Referring to
Referring to
Further folding of the carton blank 10, bends the carton about the fold line 15 that lies between the lower side pane; C2 and the upper side panel D2. During this folding step, the flaps 37 are brought into contact with the inside surfaces of the top edge of the bottom end panels A1, A2.
The top panel B and the second upper sidewall D1 and lower sidewall C1 are then folded into place by folding them about the appropriate fold lines 16, 17 and 18 between the panels whilst tucking the flaps 37 behind the tops of the end panels A1 and A2. During these folding steps the second set of gussets 39 are folded inwards and caused to engage the second set of slots 34 in the flaps 32 of the bottom end panels A1, A2. Again the hooks 35 help to restrain the gussets 39 in the slots 34. This action secures the upper and lower side walls D1, C1 and bottom end panels A1 and A2 in place.
Finally, the panel F is folded upwards inside side panel C1 (see
Completion of the carton is achieved by moving the assembled carton 41 to a compression and gluing station and appropriately rotating the carton as shown in
In an alternative-embodiment the panels de-fining the carton may be formed in the blank 10 in alternative configurations.
For example, panels D1 and C1 may be hinged along a fold line to base panel A such that the side panels D1/C1, D2/C2 are symmetrically disposed about the base panel A. It will be appreciated that the skilled man would adjust the location of securing panels E and F accordingly.
In further alternative embodiments one of the panels may be composite in structure, for example panel B forming the top panel may be formed from a first part hinged to panel D2 and second part hinged to panel D1, the first and second part being assembled in overlapping relationship. Accordingly the top end panels B1 and B2 may be composite in structure.
In yet another alternative embodiment it is envisaged that flaps 33 and the adjacent end flaps 36 may be coupled by a hinged connection such as one or more fold lines connecting therebetween or one or more gusset panels hingedly connected there between. For example, the cut line 43 as shown in
It will be recognised that as used herein, directional references such as “top”, “bottom”, “front”, “back”, “end”, “side”, “inner”, “outer”, “upper” and “lower” do not limit the respective panels to such orientation, but merely serve to distinguish these panels from one another. Any reference to “fold lines” should be construed as embracing one or more of the following, a score line, a perforated line, or other form of a line of weakness, about which the blank can be folded without departing from the scope of the invention.
Upon reading the foregoing it will be obvious to one skilled in the art that the invention may be applied to a wide range of carton types and is not limited in its application to fully-enclosed gable-ended cartons of the type illustrated.
The use of glue to secure end flaps 36 onto the lower side panels Ca and C2 is optional and the flaps may be held by guides or other mechanisms known in the art during folding.
The use of a handle strep is entirely optional.
The specific shape, size and orientation of the slots 34, hooks 35 and gusset 39 may in other implementations of the invention vary from that illustrated herein. For example gusset 39 may comprise a further foldline, may be shaped other than triangular, for example may take a trapezoidal form and indeed may be spaced by a cut from the adjacent side panels C1/D1, C2/D2.
Number | Date | Country | Kind |
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0603134.8 | Feb 2006 | GB | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/US07/62282 | 2/16/2007 | WO | 00 | 8/15/2008 |