|Publication number||US20050207680 A1|
|Application number||US 11/031,235|
|Publication date||Sep 22, 2005|
|Filing date||Jan 7, 2005|
|Priority date||Jan 10, 2004|
|Also published as||DE102005001074A1, DE202004000278U1|
|Publication number||031235, 11031235, US 2005/0207680 A1, US 2005/207680 A1, US 20050207680 A1, US 20050207680A1, US 2005207680 A1, US 2005207680A1, US-A1-20050207680, US-A1-2005207680, US2005/0207680A1, US2005/207680A1, US20050207680 A1, US20050207680A1, US2005207680 A1, US2005207680A1|
|Inventors||Dierk Schumacher, Josef Pawlowski|
|Original Assignee||Dierk Schumacher, Josef Pawlowski|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (12), Referenced by (15), Classifications (24), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
DE 20 2004 000 278.7 dated Jan. 10, 2004
1. Field of the Invention
The present invention relates to a foil bag for packaging moist tissues, said foil bag, which is formed from a hose-like, flexible foil, comprising on its top side a dispensing opening for one-by-one removal of the moist tissues.
2. Description of the Prior Art
Such type moist tissues, which are made from a nonwoven material or from paper, are moistened by adding a moistener and serve for example for body care or for cleaning in household and industry. These moist tissues are packaged either in airtight dispenser boxes or in airtight foil bags, with the dispensing openings being closed by a dispenser device bonded to the foil or by a closure label. In both cases, the difficulty arising is that either the closure label or the dispenser device cannot be fully closed after having been opened for the first time so that the solvent evaporates and the tissues dry out, or there is a risk that the adhesive of the closure label or of the dispenser device bonded thereon will contaminate the moist tissues or induce a chemical reaction, thus negatively affecting the moist tissues.
In view thereof, it is the object of the present invention to provide a foil bag of the type mentioned herein above that will durably keep the moist tissues moist and clean, even after the package has been put into use.
As a technical solution to this object, a foil bag in accordance with the features of claim 1 is being proposed. For advantageous developments of this foil bag, the reader is referred to the subordinate claims.
A foil bag configured in accordance with this technical teaching has the advantage that, since the closure element is opened mechanically, any adhesive may be excluded so that contamination is unlikely to occur. Another advantage is that this mechanically openable and closable closure element is adapted to close so as to maintain an airtight hermetic seal over a long period of time; that is, even after repeated opening and closing, so that the moist tissues are kept in an airtight enclosure even after the package has been put into use, thus eliminating the risk of drying.
It has thereby been found advantageous to weld the closure element made of a hard plastic material to the foil bag by plastic welding. This dispenses with the need for attaching the closure element by adhesive means so that in this case as well contamination or chemical reaction of the adhesive with the solvent is very unlikely to occur.
In a preferred embodiment, the closure element is configured to be a frame with a lid attached thereon, said frame circumscribing an accurately defined dispensing opening while the lid is retained on the frame by means of a living hinge. The advantage thereof is that such a closure element is readily manufacturable at a low cost. Another advantage of using a living hinge is that it permits a plurality of opening cycles to be performed without damage to the closure element.
Manufacturing the closure element using a casting method results in very low manufacturing costs and allows for the use of a hard plastic, which is easy to recycle.
In a particularly preferred embodiment, a detent means is formed on the closure element. This makes it possible to repeatedly open the lid by allowing it to disengage from the detent, and to close it again by allowing it to engage into the detent, so that a reliable opening and closing mechanism that would be durable in operation is achieved.
In another preferred embodiment, a perimeter collar, which is oriented so as to conform to the frame and which projects into the dispensing opening when the lid is closed, is formed on the lid. It has thereby been found advantageous to place said collar so as to minimize the spacing between the collar and the opening. The advantage thereof is that, to some extent, the lid is sealed against the frame so that the solvent is prevented from escaping and the moist tissues from drying.
In a preferred developed implementation, the seal of the closure element is enhanced by having a bearing surface on which the lid is resting in its closed state being formed on the frame.
In another preferred embodiment, the seal of the closure element is further improved by a perimeter ridge being formed beside the bearing surface on the frame, said ridge being oriented to conform to the lid which it surrounds. It has thereby been found advantageous to minimize the spacing between the ridge and the lid for optimum sealing.
In still another preferred embodiment, a perimeter welding edge is formed on the frame of the closure element. Said welding edge, which protrudes therefrom in a collar-like fashion, serves to receive a portion of the foil bag so that the foil bag may be welded to the frame of the closure element in the region of its opening using a plastic welding process.
In a completely different preferred embodiment, the dispensing opening of the closure element is sealed by a sealing plate attached to the frame and providing an airtight hermetic seal. It has thereby been found advantageous to retain the sealing plate on the frame through a perimeter break line so that said sealing plate may be readily removed by a user. If a pivotal ring pull is mounted to the sealing plate, removal of said sealing plate is particularly easy. Such type ring pulls are known from other packages such as from tin cans or canned fish.
The advantage of such a sealing plate is that the moist tissues are packaged by the manufacturer under the strictest hygienic conditions and that the unbroken seal of the sealing plate indicates to the customer that said package has not yet been opened since the sealing plate can only-be removed by causing damage to the closure element.
In still another preferred embodiment, an elastomer gasket is provided between the frame and the lid of the closure element, said elastomer gasket being preferably formed from PETP, PP, PE, PTA or PTE. This relatively soft elastomer has the advantage of sealingly fitting corresponding surfaces of the closure element formed from hard plastic, thus further improving the seal of the foil bag. Another advantage is that such an elastomer may be injection molded integral with the closure element formed from hard plastic at a very low cost.
In a preferred developed implementation, the elastomer gasket is disposed within the closure element so that the closure element provides for a first seal, with the additional elastomer gasket optimizing said seal. The elastomer gasket is disposed within the closure element so as to be already protected from environmental conditions, which results in a very long life of the elastomer gasket.
In a preferred developed implementation it has been found advantageous to configure the elastomer gasket in such a manner that it is slightly compressed when the lid is closed. The restoring forces inherent in the elastomer are activated as a result thereof, thus reliably pushing the elastomer gasket against the respective confronting wall so that the gap to be sealed is provided with a durable seal, even if irregularities in the material or manufacturing inaccuracies in the sizes of the various component parts result in differently sized gaps.
In another preferred embodiment, the elastomer gasket is provided on the perimeter. Comprehensive sealing is thus ensured.
In a particular embodiment, the elastomer gasket is attached to the lid and fits against a shoulder extending along the perimeter of the frame. When the lid is being closed, the elastomer gasket is moved together with the lid toward the opening and is seated onto the corresponding perimeter shoulder. The advantage thereof is that the gasket fits in a defined manner on the perimeter shoulder so that an outstanding seal is achieved. Another advantage is that the gasket can be attached to the lid at low cost.
In another preferred embodiment, a perimeter collar is formed as an integral part of the lid with the elastomer gasket being embedded in the frame at a shoulder and coming to rest against said collar. The advantage thereof is that the shoulder can be formed to conform to the contour of the elastomer gasket, thus permitting further improved sealing.
In a preferred developed implementation, the elastomer gasket is configured to have a mushroom-type cross section with the small face of the elastomer gasket being embedded in the shoulder. The advantage thereof is that the relatively wide mushroom head comes to rest against the lid and/or collar so that there is a very large surface available for sealing.
In another preferred embodiment the elastomer gasket is designed to be of a much larger size than the spacing between the frame and the lid. As a result, the elastomer gasket is partially turned up so that the restoring forces inherent in the elastomer push the elastomer gasket against the lid, thus ensuring a good fit of the elastomer gasket against the lid.
Further advantages of the foil bag of the invention will become apparent in the appended drawings and in the following description of embodiments thereof. Likewise, the invention lies in each and every novel feature or combination of features mentioned above or described herein after. The embodiments discussed herein are merely exemplary in nature and are not intended to limit the scope of the invention in any manner.
In the drawing:
At the bottom side of the lid 20, a perimeter collar 22 that protrudes from the lid 20 is formed. A bearing surface 24, against which the lid 20 comes to rest in the closed condition, is concurrently provided on the frame 18. A perimeter ridge 26 is provided on the frame 18 next to the bearing surface 24, said ridge surrounding the lid 20 in the closed condition. Both the collar 22 and the ridge 26 are thereby placed such that the spacing between the respective ones of the lid 20, the collar 22 and the frame 18, and the ridge 26 is minimized so that good airtight closure is achieved.
To facilitate operation of said closure element 16, a pull strap 28 is formed on the lid 20, with the perimeter ridge 26 missing in the region of said pull strap 28. In this region, a detent means is formed on the closure element 16, said detent means including a collar protrusion 30 formed on the collar 22 and a frame protrusion 32 formed on the frame 18, said collar protrusion 30 engaging behind the frame protrusion 32 in the closed condition. A reliable detent means is thus provided which retains the lid 20 in the closed condition while ensuring airtight closure thereof.
As used herein, airtight means that moisture is kept from escaping from the moist tissues to the greatest possible extent.
A vertically protruding perimeter-welding edge 34 is formed on the frame 18, said welding edge engaging inside the foil bag 10, said foil bag 10 coming to rest against said welding edge 34 and the foil bag 10 being welded to the frame 18 at this welding edge 34.
The foil bag 10 is supplied with the dispensing opening 14 defined by the frame 18 being closed by a sealing plate 36. A pull ring 38 is pivotally attached to the top side 12 of the sealing plate 36. A break line 40 is provided on the perimeter of the sealing plate 36 so that the sealing plate 36 can be broken out of the closure element 16 along said break line 40. To this purpose, the user only needs to lift the pull ring 38 on one side so that part of the sealing plate 36 is pushed down by the pull ring 38, causing a first portion of the break line 40 to break. As the pull ring 38 is pulled further, the break line 40 continues to break until the entire sealing plate 36 is released and can be removed. After that, it is possible to remove the moist tissues one by one.
The method of manufacturing the foil bag 10 of the invention will be described in detail hereinafter with reference to
In another embodiment that has not been illustrated herein the welding station is configured to be an ultrasonic welding station so that the foil 44 is connected to the closure element 16 by ultrasonic welding.
The second embodiment of a foil bag 110 of the invention, which is illustrated in the
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|U.S. Classification||383/66, 206/812, 383/204, 206/494, 383/80|
|International Classification||B65B9/06, B65D75/58, B65D51/20, B65B61/18|
|Cooperative Classification||B65B61/184, B65B9/06, B65D75/5838, B65D2251/0093, B65B25/145, B65D51/20, B65D2251/0021, B65B61/005, B65B61/186|
|European Classification||B65B25/14C, B65B61/00C, B65B61/18D, B65B9/06, B65D51/20, B65D75/58E1A|
|May 25, 2005||AS||Assignment|
Owner name: DR. SCHUMACHER GMBH, GERMANY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SCHUMBCHER, DIERK;PAWLOWSKI, JOSEF;REEL/FRAME:016956/0141
Effective date: 20050115