UV-blocking colorless transparent glass container

The most significant feature of glass containers, unlike other cans or paper containers, is the transparency of the contents. However, it is precisely because of this that outside light can easily pass through the container and cause the contents to deteriorate.
For example, if beer or other beverages are used for a long period of time under sunlight, odors and fading will occur. Of the light that causes the deterioration of the content, the most harmful is ultraviolet rays having a wavelength of 280 to 400 nm.
In the use of glass containers, the content clearly shows its true color in front of consumers, which is an important means to display its product characteristics. Therefore, users of glass containers are very hopeful that they will have a new type that is colorless, transparent and can block ultraviolet radiation. Products come out.
In order to solve this problem, recently developed a colorless and transparent glass (UVA means absorption of ultraviolet light) which is called UVA Flint and can absorb ultraviolet rays. The manufacturing method is that, on the one hand, by adding a metal oxide capable of absorbing ultraviolet rays in the glass while using the color complementary effect, adding some metal or its oxide, the colored glass is discolored. Currently, commercially available UVA glass is generally added with two metal oxides, vanadium oxide (V2O5) and cerium oxide (CeO2).
Since only a small amount of vanadium oxide is added, a desired effect can be obtained, so that only a special additive feed tank can be used in the melting process, which is particularly suitable for small batch production.
For a UVA glass and normal glass with a thickness of 3.5 mm, a random sampling test of the light transmittance at a wavelength of 330 nm shows that the ordinary glass is 60.6% and the UVA glass is only 2.5%.
In addition, the color fading test was performed by irradiating the ultraviolet ray with 14.4 J/â–¡ of the ultraviolet ray to the blue pigment sample sealed with a common glass and a UVA glass container. As a result, the residual ratio of the color in the ordinary glass was only 20%. Little fading was found in the UVA glass. The comparative test confirmed that UVA glass has the ability to effectively suppress fading.
The sunlight exposure test of wines filled with ordinary glass bottles and UVA glass bottles also showed that the former wine had far higher degree of discoloration and deterioration of taste than the latter.