Dispensing – With discharge assistant – Container with follower
Patent
1988-12-05
1990-08-28
Rolla, Joseph J.
Dispensing
With discharge assistant
Container with follower
222389, B65D 8314
Patent
active
049518470
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a two-chamber compressed-gas pack consisting essentially of a can body and of a concertina with a bottom and a collar reversing during movement in the can body, and to a process for producing it.
A two-chamber compressed-gas pack is a container for receiving and dispensing liquid and pasty products under pressure and consists of a rigid, usually metal outer container, namely the can body, in which a concertina with a rigid bottom and a reversible collar is fastened in such a way that two chambers are formed, one being filled with the extraction product and the other with a propellent gas under increased pressure or a pressure-generating fluid. The pressure of the propellent gas is relieved by means of a valve which is located on the product side and which allows the product to flow out of the pack when it is actuated.
The advantage of containers of this type in comparison with known spray cans is that the propellant expelling the product remains in the container and, furthermore, does not come in contact with the product. The lastmentioned fact is very important especially when the product is a foodstuff, cosmetic agent or medicine.
However, where the two-chamber compressed-gas pack is concerned, problems arise repeatedly in the region of the point of connection of the concertina to the outer container or during its handling. According to U.S. Pat. No. 3,415,425, the collar which reverses during movement in the can body is incorporated by means of its orifice edge in the bottom seam of the three-part outer container consisting of a bottom, a cylinder and a valve plate, in order to guarantee the necessary sealing between the product chamber and the propellant chamber. In a similar way, according to U.S. Pat. No. 3,620,420, the orifice region of the reversing collar is gripped in, among other things, the seam of the cover for fastening the valve plate or glued on in the upper part of the can body. In addition, the introduction of a tubular supporting ring in the region of the reversing collar is proposed, so that the latter is guided in a controlled manner and is not pressed radially inwards, which could have an influence on the discharge of the product and the sealing effect of the concertina.
The essential disadvantages of two-chamber compressed-gas packs according to the state of the art described are that multipart can bodies are absolutely unavoidable and/or that the inserted supporting ring builds up a very high frictional force which impedes the discharge of the product because of the lack of differential pressure between the chambers. Moreover, the outlay in terms of material for the concertina and possibly also the supporting ring is considerable.
SUMMARY OF THE INVENTION
The inventors therefore made it their object to design a two-chamber compressed-gas pack which does not have such disadvantages, and to develop processes for producing it.
The first part of the object is achieved by means of the features of the subject of the invention and a two-chamber compressed gas pack provided consisting essentially of a can body and of a concertina or diaphragm with a bottom and a collar reversing during movement in the can body, wherein the collar is fastened over its entire region to the inner wall of the can body.
The two-chamber compressed-gass pack according to the invention is therefore characterized in that not only the collar end is used for sealing off the chambers, with the effect that the collar can collapse radially in itself. Furthermore, at least during the period of time in which the compressed-gas pack still contains relatively large quantities of product and the propellant pressure is therefore also still very high, the sealing surface is large, at least larger than in the seal according to the state of the art described, so that, during the handling of the pack, slight deformations of the cylindrical body of the compressed-gas pack never have any influence on the impermeability of the collar reversing during movement.
The can body can
REFERENCES:
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patent: 3986641 (1976-10-01), Casey
patent: 4184608 (1980-01-01), Christensson
patent: 4330289 (1982-05-01), Christensson
patent: 4350272 (1982-09-01), Petterson
Hardt Jean
Hoefling Erich
Reiss Steven
Rolla Joseph J.
Swiss Aluminium Ltd.
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