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The Manufacturing Process for Automotive Windscreens


Glass is formed up of a number of oxides that combine and interact with one another when heated. These consist of calcium oxide, sodium oxide, and silica. Sand, soda ash, and limestone are the raw ingredients used to create these products. Simply explained, soda ash serves as a flux by lowering the melting point of the batch composition. In order to make the glass harder, lime is added. Several additional oxides, including magnesium oxide, potassium oxide, and aluminium oxide, are also included in Ruisheng Glass Bottle used for windscreens.

The Method

The right quantities of the basic components are weighed out and blended with a tiny quantity of water. Once created, it will be fed into a large tank where it will be melted using the float glass technique. The batch is first heated until it is molten, and it is then put into a tank called the float chamber, which has a bath of molten tin. The tin’s temperature ranges from 1,835 degrees Fahrenheit at its entry to a slightly lower 1,115 degrees Fahrenheit at its departure. The glass in the float chamber floats on top of the tin rather of sinking into it, travelling through the tank as if on a conveyor belt. While the hot temperatures purge the glass of impurities, the perfectly flat surface of the tin also causes the glass to become flat. The glass may harden enough to enter the next chamber due to the chamber’s exit’s lower temperature. Following its escape from the float chamber, the glass is picked up by rollers and fed into a Lehr furnace. After passing through the Lehr and cooling to ambient temperature, the glass leaves this furnace having been progressively cooled to a temperature of around 395 degrees Fahrenheit. It is now very robust and rigid and prepared for cutting.

Making and Tempering Cuts

A diamond scribe is used to cut the glass. Due of its greater hardness than glass, diamond is employed. The chopped component must next be shaped using a mould. The glass sheet is inserted into a metal mould. After that, a furnace is used to heat the glass-filled mould until the glass takes on the form of the mould.

Following this shaping phase, tempering—a heating process—is required to harden the glass. The glass is made tougher by a procedure that involves heating it up to around 1,565 degrees Fahrenheit before blasting it with cold air. As a result, when the car glass is broken, it may shatter into many little pieces of glass without sharp edges.


In this procedure, a coating of plastic is used to connect two sheets of glass together. In a unique oven, lamination takes place. To serve as a UV screen, the plastic layer is often coloured. Shattered laminated glass stays clear and the broken shards of glass are still attached to the tear-resistant plastic layer. Comparatively speaking, laminated safety glass may undergo further processing.