Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Heterogeneous arrangement
Reexamination Certificate
2000-02-28
2001-06-12
Douyon, Lorna M. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Heterogeneous arrangement
C510S294000, C510S298000, C510S302000, C510S375000, C510S446000
Reexamination Certificate
active
06245731
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a packaging system for a stack of tablets containing a bleaching agent.
BACKGROUND OF THE INVENTION
Packaging systems for stacks of tablets are widely used in food industry. Such packaging systems often take the form of a wrapper, sometimes a shrinkable wrapper, because such packaging systems are relatively easy to process at high speed and in large quantities. Because tablets are normally adapted so as to correspond to a basic consumer unit, the tablets are normally used the one after the other, and not all at once. In order to protect the remaining tablets after the first opening of the packaging system and up to use of the complete stack, it is often preferred to have the stack of tablets contained in a packaging system comprising re-closing means.
The present invention concerns a packaged product comprising the combination of a stack of tablets with a packaging system containing the stack of tablets, whereby the packaging system comprises re-closing means. Such a packaging system is known from WO92/20593 published on theof Nov. 7, 1992 for food product.
Among the advantages of such packaging systems is the fact that they are air-tight when closed, which is particularly adapted for packaging food products which are very sensitive to oxygen. Further, these packaging systems can be repeatedly re-closed.
However, air-tight packaging systems for food product are not adapted to packaging of chemical compositions, such as a bleaching agent. Indeed, if such materials are packed in an air-tight packaging system, the gas may be released within the package without being evacuated, thus deforming the packaging system and, in extreme cases, leading to explosion of the packaging system, as the content may release gas.
The invention seeks to provide a packaged product of the above mentioned kind which can protect tablets comprising chemical compositions which may also release gas.
SUMMARY OF THE INVENTION
In accordance with the invention, this object is accomplished with a packaged product of the above mentioned kind in that the tablets comprise a bleaching agent and the packaging system is formed from a material having a Moisture Vapour Transfer Rate of less than 20 g/m
2
/day measured at 40° C. and 75% Equilibrium Relative Humidity (eRH).
DETAILED DESCRIPTION OF THE INVENTION
A packaged product in accordance with the invention has a number of advantages. Since the material forming the packaging system has a Moisture Vapour Transfer Rate (MVTR) of less than 20 g/m
2
/day, the ingress of water in the packaging system is limited, so that the stability of the bleaching agent can be maintained. Indeed, a bleaching agent is very sensitive to humidity, so that it decomposes in a humid environment. Furthermore, a bleaching agent may release gas. Gas release would be accelerated in a high temperature environment. Since the material forming the packaging system may have a micro-hole, gas would be evacuated out of the packaging system if pressure builds up within the packaging system, whereas gas transfer is very limited when the pressure inside the packaging system is in equilibrium with the external pressure. Indeed, a micro-hole is such that it will give way significantly only in case of a pressure gradient between the two sides of the hole. This is due to the resilience of the packing material. This is particularly adapted when combined with the package for the invention because the pressure gradient is normally such that pressure inside the package is always at least equal to the external pressure, so that water does not have any substantial access to the inside of the package, whereas gas release will be controlled. Consequently, such a packaged product would not induce a risk of explosion while efficiently protecting the tablets from decomposing.
REFERENCES:
patent: 3471597 (1969-10-01), Schirmer
patent: 5225100 (1993-07-01), Fry et al.
patent: 5534178 (1996-07-01), Bailly et al.
patent: 5552851 (1996-09-01), Koboshi et al.
patent: 0576234 (1993-12-01), None
patent: 0610535 (1994-08-01), None
patent: 0634484 (1995-01-01), None
patent: 5154964 (1993-06-01), None
patent: 92 20593 (1992-11-01), None
patent: 95/02681 (1995-01-01), None
patent: 95/02677 (1995-01-01), None
patent: 9513225 (1995-05-01), None
Cossec Bernard
Duquet Jacky Pierre
Huntington Gregory Bruce
Douyon Lorna M.
Dressman Marianne
Miller Steven W.
The Procter & Gamble & Company
William Zerby Kim
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