Dispensing – With discharge assistant – Insertable cartridge or removable container
Patent
1998-02-13
1999-12-14
Derakshani, Philippe
Dispensing
With discharge assistant
Insertable cartridge or removable container
G01F 1106
Patent
active
060005823
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a cartridge for flowable media, comprising an envelope of a flexible material delimiting a volume, wherein the envelope can be provided at one end with a plunger-type pressing element and at the other end with an outlet element.
Cartridges for flowable media are known per se. They are containers for storing, transporting, and dispensing flowable media. Primarily, paste-like medias such as silicone rubber etc. are concerned, which are, for example, used in the construction industry. However, it is also known to fill adhesives, grease or other media into cartridges.
Different types of cartridges are known. In one type a sleeve or envelope delimiting a volume is provided in the form of a stable housing-like element which, in general, is provided at one end with a dispensing area and at the other end with an opening for a piston-like pressing element. The dispensing area comprises conventionally a dispensing opening, whereby it is known to close off the opening is by an element that is a unitary part of the envelope. When needed, this closing element is opened by cutting it open so that the dispensing opening results. In the area of the dispensing opening a socket provided with an inner or outer thread can be provided onto which a dispensing nozzle is placed. Such cartridges are primarily made of plastic so that with respect to their manufacture and disposal many expenditures are incurred.
The containers are primarily disposable containers because they cannot be completely emptied and they cannot be universally employed. Since the most favorable plastic is always selected for manufacturing the cartridges, they are not universally employable for all materials, but for different media different types of cartridges must be produced. A further problem is the incomplete and unsatisfactory emptying of the cartridges. Furthermore, it is easily possible that the operator becomes contaminated with the media. Finally, the produced empty cartridges are already of a size during transport to the filling station as they are after filling, i.e., they require a large transporting volume.
Stiff, tubular cartridges with a pressing area at one end and with a piston-shaped pressing element at the other end are emptied with a dispensing device into which the tubular element is clamped and with which the pressing element is moved by way of a pressure piston.
It is known to use, instead of the cylindrical containers, a hose container for the media to be dispensed. Such hose containers are comprised substantially of a foil hose which is closed off at both ends. It is known to close off the ends by so-called metal clips. The use of such hose containers is suggested primarily to avoid the disposal of a plurality of emptied cylindrical containers. The manufacture of hose containers is simpler and so is their disposal. Since the hose containers are not shape-stable, they are inserted into shape-stable cylindrical sleeves for dispensing the media contained therein whereby the sleeve has at one end a closure with a dispensing opening, for example, for arranging thereat a nozzle tip. At the other end of the cylindrical outer sleeve pressure can be applied onto the hose container. For dispensing the material contained in the hose container, the container must be opened, which in practice is achieved by destroying the hose container sleeve by slitting, puncturing etc. After emptying, the hose containers are removed from the cylindrical sleeves so that only a small, substantially empty hose container must be disposed of. Even though this is advantageous in comparison to cylindrical plastic cartridges, such hose containers have the disadvantage that they can only be used up to a certain filling volume, and it is especially disadvantageous that the dispensing device can be contaminated with the contained material. Also, the operator is usually also coming into contact with the medium. Often, a complete plugging of the dispensing means results so that, in practice, they must be disposed of als
REFERENCES:
patent: 2853209 (1958-09-01), McArdle
patent: 3315847 (1967-04-01), Trumbull
patent: 3353537 (1967-11-01), Knox et al.
patent: 4854485 (1989-08-01), Collins
Derakshani Philippe
Sipag GmbH Verpackung & Service
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