How it’s made: mouth-blown window glass

The history of window glass dates back to a period shortly before the beginning of the first century AD. The Phoenicians and Syrian-Palestinian coast have developed a technique of glass blowing to create various forms of hollow glass objects. It spread throughout Italy, Germany, Switzerland, and France as a result of the emergence of the Roman Empire. Glass production flourished and Romans start using it for architectural purposes.

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What is mouth-blown window?

It was not until the 11th century that the technique of mouth-blown cylinder for windows sheet glass was developed for the first time in Germany and then adopted by Venetians. Crown glass and Cylinder glass are two types of authentic and impressive old windows that are commonly found in historic buildings in the United States. Both types use a blow tube to shape the molten glass. The cylindrical glass begins with a molten glass ball at the end of the tube, which blows and opens into a deep hole until the elongated capsule-shaped shapes and the desired length and diameter are reached. The ends of the nacelle are cut out of the glass to form a cylinder which is then cooled, incised along the length, heated and flattened. Corona glass has been developed over the last 7 to 8 centuries and has been launched to make window glass as an alternative to cylindrical glass. Although they were replaced by modern methods developed during the Industrial Revolution, some of these early glass-making processes are still practiced in Europe, reflecting the original appearance of authentic antique glass. Germany Glashütte Lamberts, as it is generally recognized, is the manufacturer of the best-blown glass in the world. In the United States, blown glass has the greatest impact on vintage or restoration glass. They are called old blown glass, hand-blown glass, but they all describe the same historical process of glass production. This process of producing glass for windows became common in the 19th century and is currently continuing in limited production.

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How it is made?

In this type of glass, the process involves extracting or collecting the molten glass from a melting furnace and forming a drop of molten glass at the end of the tube. Due to the slow process of adding air to bubble and heating it, rotating and balancing molten glass, the cylindrical bubble is formed. During this phase, various surface characteristics are introduced into the glass. These surface deformations can be in the form of bubbles or seeds of different sizes in the glass, spots, and degrees of surface textures. Once the desired texture and size have been reached,  glass is removed from the purge tube and the glass cylinder or sleeve is placed in the annealing furnace, a progressive cooling process. After cooling the cylinder, its ends can be removed, leaving the glass cylinder. Then this cylinder is hammered, and in the glass along the fracture of the cylinder is reached. The glass cylinder is now ready for flat glass alignment. The glass will be returned to the furnace and heated to about 1250 ° F. At this temperature, the glass will again be in a ductile state and can be flattened into a sheet. The newly formed sheet will be removed from the oven and returned to the annealing furnace for gradual cooling.

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