Flexible bags – With closure – Including separate closure element for straddling bag mouth
Reexamination Certificate
2001-02-23
2003-04-01
Pascua, Jes F. (Department: 3721)
Flexible bags
With closure
Including separate closure element for straddling bag mouth
C383S071000
Reexamination Certificate
active
06540400
ABSTRACT:
FIELD OF INVENTION
The invention relates to a bag for one-component or two-component compositions containing a liquid having at least one open end gathered together into a pleated closure and closed off with a clip.
BACKGROUND INFORMATION AND PRIOR ART
Many materials, such as sealing materials and adhesives, are filled into bags at the present time. The bags are closed off with wire or a prefabricated clip. The materials are, for example, one-component or two-component compositions, such as polyurethane systems, silicone compositions, injection composite mortars and the like. Depending on the materials contained and the physical behavior of the liquid content of the compositions filled into the bags, leaks may occur at the open ends of the bags gathered together in pleated closures. These leaks are caused when the liquid components separate from the other materials, filled into the bag, and flow from the bag through the folds of the bag in the region of the clip, intensified by capillary action. Such effect can be amplified even more by filling the bag with coarse materials.
Methods are known, which are intended to seal the bag by additional measures, such as welding or additional sealants. A bag of the type mentioned is known in DE 29809514 U1. In the region of the pleated closure, the bag has a sealing film, which consists, for example, of wax, adhesive or the like. However, a disadvantage of this known solution is that the liquid is not stopped from emerging in the region of the pleated closure, since the sealants generally do not achieve any adhesive action with the surface of the bag.
Furthermore, a bag is disclosed in CH 277854, where the pleated closure is welded. It is a disadvantage of this known solution that, in the event the material filled into the bag, is in the region where the welded seam is to be produced, the bag may leak.
OBJECT OF THE INVENTION
It is an object of the present invention to prevent an uncontrolled flow of liquid from bags having at least one end gathered together into a pleated closure.
SUMMARY OF THE INVENTION
In accordance with the invention, the object is accomplished owing to the fact that an absorbent for the liquid is disposed at least partially in the region of the pleated closure.
Owing to the fact that the emerging liquid is collected with the help of an absorbent in the region of the pleated closure, the uncontrolled flow into the region surrounding the bag closure and, especially, a contamination of the surface of the bag can be avoided. In addition, this arrangement also avoids an uncontrolled passage of liquid from the bag in the region of the clip. In this region, the bag can be damaged by filling material in the region of the clip, in such a manner that leakages occur there. The emerging liquid is taken up or bound immediately by the absorbent by chemical or physical means in the region of the pleated closure.
Advisably, at least at the internal periphery of the bag, the pleated closure has an absorbent for liquid, in order to take up immediately any liquid flowing out at the gathered end of the bag. In addition, the possibility exists of disposing the absorbent in the free end itself; in this way, it is protected largely by the pleated closure from external effects.
Advantageously, the pleated closure has an absorbent for liquid, at least partially at the outer periphery of the bag. By means of this arrangement, the uncontrolled emergence of liquid along the outer periphery of the bag in the region of the pleated closure is avoided.
Preferably, the absorbent is disposed at the free open end of the pleated closure. Accordingly, the liquid, flowing from the bag, can be absorbed at the free end of the pleated closure. From a manufacturing point of view, the absorbent can be mounted easily at the free open end of the pleated closure, so that the manufacturing process is economical. Furthermore, for this embodiment, little absorbent is required.
The absorbent advisably is provided in the form of a cap, at least partially embracing the pleated closure radially outwardly and at the free open end. This one-part absorbent, which can be manufactured easily, represents an optimum solution for absorbing liquid, which emerges from any region of the pleated closure, and thus for keeping the region surrounding the pleated closure free from the liquid.
Furthermore, advantageously the absorbing material is disposed on the inside of a cap, enclosing the pleated closure at the free open end as well as radially outwardly. Accordingly, the absorbent is protected from external effects.
Preferably, the absorbent is formed from an absorptive material. Accordingly, it is possible to produce the absorbent from a material, which can easily be attached to the bag. As the absorbent, highly absorptive materials known from other applications can be used.
If the absorbing material is an absorbing nonwoven material, especially a felt, the bag can be manufactured economically and is easily handled by the user.
If the absorbent consists of a material, which reacts chemically with the emerging liquid, the liquid absorbed is bound chemically and contamination of the surrounding environment is prevented. The chemical material is to be selected so that, after the reaction with the liquid, a material is formed which no longer is flowable, especially a solid or a highly viscous material. This embodiment is optimum, especially for aggressive liquids and/or for liquids, the handling of which is unpleasant.
Preferably, the chemically reacting material is a polyacrylic acid copolymer or a polyacrylate, which has been provided with epoxide groups for the absorbent. By such means, an economic manufacture of the bag is ensured.
REFERENCES:
patent: 2102702 (1937-12-01), Hall
patent: 2682903 (1954-07-01), Gay
patent: 3317119 (1967-05-01), Lasoff
patent: 3612325 (1971-10-01), Williams
patent: 5381914 (1995-01-01), Koyama et al.
Ginter Herbert
Gross Joan
Sieber Roland
Hilti Aktiengesellscgaft
Pascua Jes F.
Sidley Austin Brown & Wood LLP
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