Friday, May 23, 2008

TASK 3 : glass making

There are several materials which are needed to make glass. The three main things we need which are shown in the picture are sand, soda, and limestone. First of all, mixed all the three materials and make them into powder. Secondly, put the mixed-powder into a calcining furnace. Then, these powder are kept in a moderate heat for 5 or 6 hours and being frequently stirred during the process. After the process, we get frit.
According to the picture, this frit is being made into two kind of glass, plate glass and bottle glass. To make plate glass, just send the frit into rollers to be pressed. Meanwhile, to make bottle glass, send the frit to a removable mould and blow it with air at the same time to make the it harden. Finally, we can get the bottle glass after removing the removable mould.

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