Food or edible material: processes – compositions – and products – Packaged or wrapped product – Having consumer oriented diverse utility
Patent
1988-09-28
1990-02-20
Cintins, Marianne
Food or edible material: processes, compositions, and products
Packaged or wrapped product
Having consumer oriented diverse utility
426 8, 426118, 426124, C12G 100, C12G 300, C12C 1100, C12C 1300
Patent
active
049025210
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a pressure pack especially for gaseous, e.g. carbonated liquids. One specific example of a use of a pack of the invention is in fermenting liquids to produce carbonated alcoholic drinks.
It is one object of this invention to provide a pack for the purpose specified, which is resistant to high pressure and yet which is sufficiently cheap to be disposable.
According to one aspect of the invention there is provided a two component pressure resistant pack comprising an inner bag component and an outer bag component, the inner bag component being fluidtight and formed of a flexible plastics, the inner bag component having an inlet including a pressure relief valve and having an outlet tap, the outer bag component being pressure resistant, the valve and the tap of the inner bag component protruding through holes therefor in the wall of the outer bag component, the inner bag component being arranged so that upon an increase in pressure therein caused by fermentation of a fermentation mix therein the inner bag component will expand to contact the inner wall of the outer bag component at spaced apart locations where the outer bag component then supports the inner bag component against the pressure therein while allowing for portions of the bag wall between the supported locations to expand further.
The bag components will usually but not necessarily be individual bags. Most preferably, the inner bag and the outer bag components are both generally rectangular as seen in elevation. The volume of the inner bag is not dependent on that of the outer bag and may have a volume substantially the same or greater than that of the outer bag or, if made of a material which is sufficiently flexible, the inner bag may be relatively smaller than the outer bag.
It is a preferred feature of the invention that the wall of the inner bag is formed of a material which is fluidtight, and substantially impermeable to any gases present in the inner bag or the environment. Because the inner bag must expand to its full volume and perhaps then beyond as the pressure within rises, the material therefor must have this property. Where the inner bag is sealed by heating, the material must tolerate the sealing temperature. Laminates are preferred. It is a preferred feature of the invention that hot water is added to the inner bag to sterilise the contents and for this to happen without adverse side effect it is preferred that the bag is formed of a material which is unaffected by the sterilization temperature and so too are the components of the valve and tap.
Where the wall of the inner bag is heat sealed to itself, the temperature and pressure may tend to cause a change in the properties of the wall and weaken it, and there is a risk that under pressure the seal will tend to delaminate. We have observed that the outer bag tends to expand in different directions at differential rates, and we prefer to locate the inner bag within the outer bag such that the latter will resist and contain any such tendency to delamination.
In addition, it has been observed that as the inner bag expands because of the pressures generated therein, gaps tend to develop where the outer bag has a different rate of expansion. This tendency is noticeable where the gland of the pressure relief valve extends through the hole in the outer bag and also along opposed side walls of the bag. This tendency to separation is preferably resisted, according to the invention in one or both of two ways: by locating the inlet valve in a portion of the outer bag where stresses are reduced such as a corner, and by reinforcing the outer bag by incorporating strands or strips of reinforcing material in the wall of the outer bag, especially in the region of the inlet valve and/or tap. Where the outer bag is formed of a woven material the reinforcing area can be formed by increasing the density of the fibres or by the presence of extra fibres or by the presence of materials of relatively enhanced tensile characteristics. In another embodiment, a retaining ring is mou
BKG Holdings Limited
Cintins Marianne
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