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Float glass is a sheet of glass made by floating molten glass on a bed of molten metal of a low melting point, typically tin, [1] although lead was used for the process in the past. [2] This method gives the sheet uniform thickness and a very flat surface. [ 3 ]
Most float glass is soda–lime glass, but relatively minor quantities of special borosilicate [10] and flat panel display glass are also produced using the float glass process. [11] The float glass process is also known as the Pilkington process, [12] named after the British glass manufacturer Pilkington, who pioneered the technique (invented ...
Most float glass is soda–lime glass, but relatively minor quantities of specialty borosilicate [64] and flat panel display glass are also produced using the float glass process. The success of this process lay in the careful balance of the volume of glass fed onto the bath, where it was flattened by its own weight. [65] Full scale profitable ...
Machine drawn cylinder sheet was the first mechanical method for "drawing" window glass. Cylinders of glass 40 feet (12 m) high are drawn vertically from a circular tank. The glass is then annealed and cut into 7 to 10 foot (2 to 3 m) cylinders. These are cut lengthways, reheated, and flattened. This process was invented in the US in 1903.
Pilkington aggressively protected its patents and trade secrets through a network of licensing agreements with glass manufacturers around the world. The modern "float" technique (pouring the molten glass on a layer of very pure molten tin) became commercially widespread when Alastair Pilkington developed a practical version, patented in the late 1950s and early 1960s.
Libbey-Owens merged with the Edward Ford Plate Glass Company in 1930 to form Libbey-Owens-Ford Glass Company. [1] In April 1986, LOF sold its glass business and name to the Pilkington Group, a multinational glass manufacturer headquartered in the United Kingdom. The remaining three business units of the company, Aeroquip, Vickers, and Sterling ...
Plate glass is often used in windows. Fragment of a Roman window glass plate dated to 1st to 4th century CE. Plate glass, flat glass or sheet glass is a type of glass, initially produced in plane form, commonly used for windows, glass doors, transparent walls, and windscreens. For modern architectural and automotive applications, the flat glass ...
The cut cylinder is then placed in an oven where the cylinder unrolls into a flat glass sheet. Blenko Glass Company used this method to make flat glass during the 20th century, but it used a process patented by William Blenko that used molds for the cylinder to enable consistency in the size of the glass. In Blenko's case, slight imperfections ...