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Annealing is a process of slowly cooling hot glass objects after they have been formed, to relieve residual internal stresses introduced during manufacture. Especially for smaller, simpler objects, annealing may be incidental to the process of manufacture, but in larger or more complex products it commonly demands a special process of annealing in a temperature-controlled kiln known as a lehr. [1]
The manufacturing process for soda–lime glass consists in melting the raw materials, which are the silica, soda, lime (in the form of (Ca(OH) 2), dolomite (CaMg(CO 3) 2, which provides the magnesium oxide), and aluminium oxide; along with small quantities of fining agents (e.g., sodium sulfate (Na 2 SO 4), sodium chloride (NaCl), etc.) in a glass furnace at temperatures locally up to 1675 ...
Glass can be "double rolled", which means it is passed through two cylinders at once (similar to the clothes wringers on older washing machines) to yield glass of a specified thickness (typically about 1/8" or 3mm). The glass is then annealed. Rolled glass was first commercially produced around the mid-1830s and is widely used today.
Lehr (glassmaking) In the manufacture of float glass, a lehr oven is a long kiln with an end-to-end temperature gradient, which is used for annealing newly made glass objects that are transported through the temperature gradient either on rollers or on a conveyor belt. The annealing renders glass into a stronger material with fewer internal ...
Millefiori (Italian: [ˌmilleˈfjoːri]) is a glasswork technique which produces distinctive decorative patterns on glassware. The term millefiori is a combination of the Italian words "mille" (thousand) and "fiori" (flowers). [1] Apsley Pellatt in his book Curiosities of Glass Making was the first to use the term "millefiori", which appeared ...
Plastic arts are art forms which involve physical manipulation of a plastic medium, such as clay, wax, paint – or even plastic in the modern sense of the word (a ductile polymer) – to create works of art. The term is used more generally to refer to the visual arts (such as painting, sculpture, ceramics, architecture, film and photography ...
Neoplasticism (or Neo-plasticism), originating from the Dutch Nieuwe Beelding, is an avant-garde art theory proposed by Piet Mondrian [a] in 1917 and initially employed by the Dutch De Stijl art movement. The most notable proponents of this theory were the painters Mondrian and Theo van Doesburg. [1] Neoplasticism advocated for a purified ...
The researchers suggested that arts and crafts could improve public health. “Governments and national health services might consider funding and promoting crafting, or even socially prescribing ...
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