Envelopes – wrappers – and paperboard boxes – Paperboard box – Releasable or frangible bond between box parts provides...
Patent
1996-11-07
1998-10-06
Elkins, Gary E.
Envelopes, wrappers, and paperboard boxes
Paperboard box
Releasable or frangible bond between box parts provides...
22912582, 229208, 229213, 229 24, B65D 570
Patent
active
058164871
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a carton and a blank from which the carton can be made.
Conventional gable-top and flattened gable-top cartons can be made from blanks each consisting of a laminate. The laminate comprises paperboard coated on both faces with thermoplastics, for example low density polyethylene (LDPE), possibly with the interposition of an oxygen barrier layer, for example aluminium or ethylene vinyl alcohol (EVOH). Score lines divide each blank into a row of four body panels, a row of four bottom closure panels of which two alternate panels are formed with oblique score lines to form three triangular sub-panels, a row of four top closure obturating panels of which two alternate panels are formed with oblique score lines to form three triangular sub-panels, a row of four top closure sealing panels of which two alternate panels are divided into halves by respective score lines, and a side seam flap at one edge of the blank. To form a carton, the panels are folded about score lines perpendicular to the rows and the side seam flap is heat-and pressure-sealed to the panels at the opposite edge of the blank, thus to form a sleeve open at both ends. The bottom closure panels are folded inwards, with the two alternate panels preceding the other two panels, and heat-and pressure-sealed to each other to close the carton bottom. The carton is filled and then the top closure panels are folded inwards, with the two alternate obturating panels preceding the other two obturating panels, and the sealing panels being heat-and pressure-sealed to each other, with the two alternate sealing panels being disposed between the other two sealing panels, to form a sealing fin and thus close the carton top. It is known to coat parts of top sealing panels at one end of the sealing fin with abhesive to provide an openable pouring spout. In particular, it is known to coat with abhesive the inside and the outside edge zones of the free edge of that centrally folded sealing panel at that one end of the sealing fin, which free edge constitutes a pouring lip for the spout.
AU-B-626389 discloses a blank and a sealed carton of the character described above, but with the two folded-in top sealing panels of the carton having their free edges at a level below that of the free edges of the two other top sealing panels, except for a tab which is spaced from both the central portion and an adjacent outer end portion of the spout-providing, folded-in top sealing panel and which extends upwardly to a position above the level of the free edges of those two other top sealing panels, to be grasped and pulled by a user to enable the spout-providing, top sealing panel to be separated from those two other top sealing panels without any contact by the user with the inner surface of the spout-providing top sealing panel. The tab is spaced from the central portion of the spout a distance sufficient that, during normal use, no part of the contents of the container will contact the tab during pouring. There is a serious risk with this tab that, when pulled, it will tear away downwards, delaminating that relatively narrow part of the spout-providing top sealing panel immediately therebelow, so that the top closure remains closed.
U.S. Pat. No. 5,014,854 discloses a blank and a sealed carton of the same general character, but with the carton of a flattened gable-top form in which, after top sealing, the sealing fin is turned down onto one of the two roof-forming top obturating panels and the top closure flattened downwards. That one of the two non-folded-in top sealing panels which is uppermost after turning down of the sealing fin has an extension which projects beyond the other three top sealing panels and is tacked down to the top surface of the aforesaid one of the two roof-forming top obturating panels. The extension includes a tear strip defined by two arrays of perforations extending parallelly to the sealing fin and located between the sealing fin and the tacked-down part of the extension. The inwardly facing surface of the tear strip is coated
REFERENCES:
patent: 2695745 (1954-11-01), Dixon
patent: 4124159 (1978-11-01), Schwarzkopf
patent: 4190190 (1980-02-01), Halonen
patent: 4211357 (1980-07-01), Lisiecki
patent: 4390121 (1983-06-01), Lisiecki
patent: 4582246 (1986-04-01), Lisiecki
patent: 4813546 (1989-03-01), Gordon et al.
patent: 5176308 (1993-01-01), Frazier
Elkins Gary E.
Elopak Systems AG
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