Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
1997-08-18
1999-06-15
Group, Karl
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
501905, 215400, C03C 3087
Patent
active
059121998
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a packing for foods sensitive to UV radiation. More in particular, the invention relates to a packing made of green glass absorbing UV radiation, e.g. a bottle for packing foods and beverages made of green glass absorbing UV radiation and largely transmitting visible light. This means that efforts are directed to obtaining a type of glass largely transmitting visible light and having a green color. The latter means that the dominant wavelength of the glass is in the vicinity of 500 to 565 nm.
As is known, UV radiation, more in particular radiation having a wavelength less than about 400 nm, has a negative effect on the odor and the flavor of foods and beverages, such as beer. This negative effect is ascribed to the chemical reaction of components under the influence of UV radiation.
It has long since been known that it is possible to reduce UV radiation by using glass provided with a number of additions, mostly metal compounds. Until recently UV radiation-absorbing green glass, to which the present invention relates, was chiefly obtained by incorporating chromium compounds in the glass. EP-A 261 725 describes the manufacture of green UV radiation-absorbing soda-lime glass with an amount of chromium compounds which may be partially replaced by nickel Compounds, if required. The use of especially chromium compounds, like of nickel compounds, is increasingly felt to be less desirable, both from the viewpoint of costs and from the viewpoint of environmental effects of the metal compounds.
Japanese patent application JP-A 1/65044 describes the use of iron-containing lava as addition to soda-lime glass to obtain glass having a dark green color. However, by adding the lava the composition of the glass batch is changed in such a manner that the processability deteriorates while the color tends towards very dark green to nearly black.
From the literature it is already known that green-colored glass having absorption capacity for IR and TV radiation can be obtained by incorporating iron compounds in glass. This often concerns the manufacture of glass used for windows, e.g. heat- and light-resistant car windows. In general, it involves a slight reduction of the transmission of the radiation by incorporating a minor amount of iron, mostly in combination with a number of other additions.
The amount of iron compounds in such glass compositions in general is less than 2, more in particular less than 1 wt. % of the glass composition.
The transmission of UV radiation in such glass compositions is still high, because otherwise the transmission of the visible light is too much inhibited. For this reason the transmission at 380 and 400 nm is still at a level that makes the glass composition unsuitable for use as packing glass for foods and beverages sensitive to UV radiation.
On the other hand, the problem occurs that the transmission for visible light must be maintained at least partially, because the consumer/user must be able to see the contents of the packing. Also, the wish to obtain a specific color can at least partially be contrary to the objective of the absorption of UV radiation.
It is an object of the invention to provide a packing for foods and/or beverages sensitive to UV radiation, which packing is based on chromium-free and preferably also nickel-free green soda-lime glass. More in particular, it is an object of the invention to provide a packing in which the transmission of radiation having a wavelength of <400 nm and more in particular also of 380 nm, at a glass thickness of 2 mm, is nil or negligible, while at least part of the transmission of visible light is retained.
The invention is based on the surprising insight that such objects can be achieved by using a relatively large amount of iron in soda-lime glass. The invention therefore relates to a packing for foods on the basis of green-colored soda-lime glass absorbing UV radiation and transmitting visible light, which glass consists of:
Surprisingly, it has been found that such a packing satisfies the requirements imposed on
REFERENCES:
patent: 2524719 (1950-10-01), Tillyer
patent: 2892726 (1959-06-01), Smith et al.
patent: 4253878 (1981-03-01), Weaver et al.
patent: 4312953 (1982-01-01), Mills
patent: 5240886 (1993-08-01), Gulotta et al.
patent: 5256607 (1993-10-01), Kerko et al.
patent: 5352640 (1994-10-01), Combes et al.
patent: 5385872 (1995-01-01), Gulotta et al.
patent: 5403789 (1995-04-01), Kerko et al.
patent: 5411922 (1995-05-01), Jones
patent: 5593929 (1997-01-01), Krumwiede et al.
patent: 5641716 (1997-06-01), Highby et al.
patent: 5650365 (1997-07-01), Highby et al.
patent: 5700579 (1997-12-01), Jeanvoine et al.
patent: 5780372 (1998-07-01), Highby
Chemical Abstracts, vol. 88, No. 24, Jun. 12, 1978, Columbus, Ohio, US; abstract No. 175980p, S. Kitao et al. `IR and UV Absorbing Glasses` p. 356; column R & JP,B.77 103 311 (Toyo Glass Co., Ltd.) Aug. 27, 1977.
Glass Technology, vol. 26, No. 01, Feb. 1, 1985, pp. 60-62, Cerchez et al. "The Effects of Iron on UV Porection . . . Green Glasses".
Patent Abstracts of Japan, vol. 13 No. 262 (C-608), Jun. 16, 1989 & JP,A,01 065044 (Kamaya) Mar. 10, 1989.
Loggers Gerrit Jan
Smout Adrianus
Group Karl
Heineken Technical Services B.V.
LandOfFree
UV radiation-absorbing packing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with UV radiation-absorbing packing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and UV radiation-absorbing packing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-402312