Thursday, March 20, 2008

The Way of Making a Glass - task 3

In modern glass factories, there are three important sectors deal with the making of a glass, the batch house, the hot end, and the cold end. In the batch house, primary composition of glass, such as sand, soda ash, limestone, feldspar, etc are put together, mixed and kept in storage silos. After that, these mixtures are sent to the furnace. The process using furnace is commonly known as the hot end. The furnace, which is natural gas or fuel fired, is operated at 1675oC. The molten glass firstly put in a pool before it’s flown into the refiner and forehearth channel, which cool the glass precisely. After that, this molten mixture is put inside a removable mould and blown up, whether by blow and blow or press and blow method. The air which is blown to the molten glass will hardened the glass until tender and stiff. Soon after, high temperatures sulfur or fluorine is injected to the glass which will make it more resistant to alkali extraction. The last part of this process is the cold end. In this process, all glasses are inspected for defects, packaged, and labeled. Before these glasses are packaged and labeled, coloring and polishing are done depends on their market purposes.

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