Envelopes – wrappers – and paperboard boxes – Paperboard box – With closure for an access opening
Patent
1995-03-20
1997-06-10
Elkins, Gary E.
Envelopes, wrappers, and paperboard boxes
Paperboard box
With closure for an access opening
531334, 533293, 53330, 53488, 22912509, B65D 572
Patent
active
056367848
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a pack for flowing media having at least one substantially flat top wall portion of plastics-coated carrier material, e.g. cardboard, in which a pouring device is arranged. The invention also relates to a method of manufacturing a pack of the afore-described kind, and finally the invention relates to a tool for carrying out the method.
The manufacture of packs made of composite material, e.g. of plastics-coated cardboard as the carrier material is known. These packs are manufactured in high capacity machines in which the web of composite material is drawn from a roll, pre-grooved and possibly pre-stamped and then shaped into a tube which is closed at its longitudinal edges by a longitudinal sealing seam. The subsequent contents are filled into this tube, and the individual, filled packs are separated from the tube and shaped by transverse sealing, so that parallelepipedal packs finally result. These packs have transverse sealing seams on the bottom and top wall which are folded down to form flat bottoms and flat top walls and which are laid over in such a way that triangular flaps project laterally which are laid over onto the side wall and welded there.
A pack for liquids which is manufactured in this way therefore has a top wall formed from three portions in which, for example, the longitudinal sealing seam which is laid over flat as well intersects the transverse sealing seam in the centre.
Numerous opening devices have been developed on packs of this kind and published. Opening devices exist which are formed from the web material, e.g. by perforated lines and tear lines, wherein these packs can admittedly be opened satisfactorily, but cannot be readily closed again, cannot usually be sealed to dust and can almost never be re-closed in liquid-tight manner. Other pouring devices also exist which are formed by sealing on tear open strips which bridge and close a hole stamped out in the web of material of the pack. With other devices, cover strips are sealed onto the inside so that the outer tear open strip is sealed through the hole to the inner cover strip. When the outer strip is torn away, it tears the inner cover strip in the region of the hole stamped out in the paper web. Many known tear open strips are torn off when the pack is opened for the first time and form waste. Other tear open strips have been sealed on to one side in such a way that they continue to be stuck to the pack after the hole on the pack has been opened. None of these pouring- and opening devices permitted dust-proof or even liquid-tight re-closure.
Whereas other pouring devices are manufactured by injection-moulding thermoplastics plastics materials, and are arranged on holes of packs which can also be re-closed, it has been seen that the manufacture or arrangement of these pouring devices either gave rise to problems or was very expensive.
The aim of the present invention is therefore to provide the pack of the kind mentioned in the introduction with an improved pouring opening which can be manufactured economically and in a technically easy way, and which can be opened easily by the end user and re-closed in such a way that the pack is liquid-tight.
This problem is solved according to the invention in that the pouring device has a bottom part containing at least one hole and a cover connected thereto in hinge-like manner and containing at least one closure cap, that a collar surrounds the hole outwardly, the closure cap has a sealing lip which can be engaged with the collar, and that on the inner side, oppositely disposed to the collar, of the bottom part, is arranged a shoulder which projects through a corresponding hole in the top wall portion towards the inside of the pack, and the bottom part is welded to the outer- and/or inner face of the top wall portion.
Although the hole in the bottom part of the pouring device, and possibly also the corresponding hole in the top wall part can be polygonal, drop-shaped, oval, elongate or circular, for the purpose of simplifying the drawing and to facilitate und
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