Disposable and returnable containers comprising an insert

Details Disposable and returnable containers comprising an insert Disposable and returnable containers comprising an insert

1995-11-02

1998-03-31

Pollard, Steven M.

Receptacles

Internal closure-like member which rests on the unused...

222386, B65D 8800

Patent

active

057328480

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention relates to disposable and returnable containers comprising an insert at their base.
Adhesives and sealants for industrial consumers are supplied in drums or similar large-volume containers which are generally made of metal. In view of increasingly more stringent environmental requirements, packs of the type in question now have to be completely or at least partly reuseable. Drums and similar metal containers are generally used as returnable containers, i.e. after emptying, they are cleaned and reconditioned so that they can be reused for the same or similar purposes. Disposable Containers are generally recycled. Both cases presuppose that the containers can be emptied as completely as possible. However, with paste-like or highly viscous materials, such as adhesives and/or sealants, this is often very difficult to achieve. Normally, adhesives or sealants are emptied by the end user with the aid of pumps, so-called pressure follower plates. These follower plates force the adhesives from the drums under high pressure. To this end, it is absolutely essential that the follower plate adapts itself exactly to the internal diameter of the drum at the periphery of the cylindrical part of the drum. This normally ensures that the vertical walls are left relatively clean after emptying. However, a critical area is the base of the drum where considerable residues of material remain after normal emptying.
2. Discussion of Related Art
To overcome these difficulties, the adhesives and/or sealants are introduced into so-called liner bags which in turn are placed in the drum before filling. Examples of this can be found in DE-A-29 18 707 and in EP-A-0 102 484. For moisture-sensitive materials, bags of multilayer composite films have also been proposed as drum liners, cf. for example DE-U-88 12 012.
However, in the case of very thick-flowing, highly viscous adhesive/sealant formulations, drum liners such as these generally cause difficulties because the liner material gets into the delivery zone of the tube and thus leads to difficulties in the transport of the adhesive. This occurs in particular when very thin-walled bags or drum liners have to be used for reasons of cost. In the case of adhesives with very little, if any, sensitivity to atmospheric moisture or atmospheric oxygen, it is desirable to avoid the use of drum liners because they complicate the filling process and hence, in addition to the material costs of the liner, cause further filling costs and waste disposal costs.
The problem addressed by the present invention was further to develop disposable and returnable containers in such a way that, after emptying of the containers by conventional pumps comprising pressure follower plates, only minimal residues of the adhesive/sealant remain in the drums so that there is largely no need for additional cleaning measures after the drums have been emptied.


BRIEF DESCRIPTION OF THE DRAWINGS

According to the invention, this problem has been solved particularly easily by the introduction of an insert in the disposable or returnable container before the filling process. One example of embodiment of the invention is described in detail in the following with reference to the accompanying drawings, wherein:
FIG. 1 is a plan view of a sheath 1.
FIG. 2 is a plan view showing the complete insert 8 consisting of a circular disc 4 and the sheath 1 with folding flaps 2 and margins 3.
FIG. 3 shows the container 6 filled with the adhesive 7 with the insert 8 consisting of the sheath 1 and the disc 4.


DESCRIPTION OF THE INVENTION

The insert 8 preferably consists of a circular disc 4 adapted to the internal diameter of the container 6, the diameter of the disc 4 generally being between 0.5 and 2 mm smaller than the internal diameter of the container. The disc 4 has a thickness of 0.1 to 4 mm and preferably a thickness of 1 to 3 mm and consists of a recyclable material, preferably cardboard or polyethylene or polypropylene.
The disc 4 is partly sheathed in a shea

REFERENCES:
patent: 2465755 (1949-03-01), Sanders
patent: 5305909 (1994-04-01), Merritt

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