Patent EA-000580-B1 (EA)
Title: Uv radiation absorbing package
Inventor: SMOUT ADRIANUS
IPC: C03C3/078
Filed: 1996-05-20
Abstract: 1. A package for foods on the basis of green colored, ultraviolet radiation absorbing soda-lime glass that is permeable to visible light and has a dominant wavelength of 500 to 575 nm, preferably of 550 to 565 nm, said glass, as compared with the weight of the glass containing at least 1.5 % by weight of iron, but not more than 15 % calculated as Fe2O3, and at least 0.10 % by weight of chromium, calculated as Cr2O3. 2. A package according to Claim 1, wherein the amount of chromium, calculated as Cr2O3, is no more than 0.5 % by weight, in particular, no more than 0.35 % by weight. 3. A package according to Claim 1 or 2, characterized in that the transmission of the glass for radiation of 380 nm at a thickness of 2 mm is < 5 %, preferably <1 %. 4. A package according to Claims 1-3, characterized in that the transmission for radiation of 400 nm at a thickness of 2 mm is < 20 %, preferably < 5 %. 5. A package according to Claims 1-4, characterized in that the content of iron, calculated as Fe203, is no more than 8 % by weight. 6. A package according to Claims 1-5, characterized in that the content of iron, calculated as Fe203, is more than 2.6 % by weight, more in particular more than 2.75 % by weight. 7. A package according to Claims 1-6, characterized in that the glass substantially contains no nickel, cobalt, vanadium, arsenic and tin. 8. A package according to Claims 1-7, characterized in that the glass also contains 0.1 to 5 % by weight of titanium and or zirconium, calculated as oxide. 9. A package according to Claims 1-8, characterized in that the glass also contains 0.1 to 5 % by weight of copper, calculated as copper (II) oxide. 10. A package according to Claims 1-9, characterized in that the glass also contains 0.01 to 0.1 % by weight of nickel, calculated as nickel (II) oxide. 11. A package according to Claims 1-8, characterized in that the glass consists of 1.5 - 10 % by weight of iron, calculated as Fe2O3, 0.10 - 0.5 % by weight of chromium, calculated as Cr2O3 50 - 85 % by weight of SiO2 5 - 25 % by weight of alkali metal oxide 5 - 25 % by weight of alkaline earth metal oxide 0 - 5 % by weight of aluminium oxide 0 - 5 % by weight of traces. 12. A package according to Claim 11, characterized in that the glass consists of 2.5 - 3.5 % by weight of iron, calculated as Fe203, 0.10 - 0.35 % by weight of chromium, calculated as Cr2O3 50 - 85 % by weight of SiO2 5 - 12 % by weight of alkali metal oxide 5 - 25 % by weight of alkaline earth metal oxide 0 - 4 % by weight of aluminium oxide 0.1 - 5 % by weight of titanium dioxide or copper (II) oxide or 0.01 - 0.1 % by weight of nickel (II) oxide, and 0 - 5 % by weight of traces. 13. A package for foods on the basis of green colored, ultraviolet radiation absorbing soda-lime glass that is permeable to visible light and has a dominant wavelength of 500 to 575 nm, preferably of 550 to 565 nm, said glass, as compared with the weight of the glass containing at least 1.5 % by weight of iron calculated as Fe2O3, and at least 0.10 % by weight of chromium, calculated as Cr2O3, and a method therefor according to any preceding Claim.