a 20th century apparatus that performed the annealing process.
The device in which finished glass is cooled.
A long belt-fed, tunnel-shaped oven used to heat glass to the annealing point and then slowly cool it to room temperature to remove any residual thermal stresses in the glass. Can also be a large oven where glass is manually loaded and unloaded (batch lehr).
A long, tunnel-shaped oven for annealing glass, usually by a continuous process.
the annealing oven or furnace where glass is gradually cooled. IGCB
The annealing chamber on a float glass manufacturing line where the molten glass is subject to controlled cooling to obtain annealed glass, free from internal stresses, which can then be cut or worked.
A continuous belt oven for annealing, fusing ceramic color and controlled cooling of glass.
The long heated oven through which glass containers move on a conveyor belt so gradual cooling will properly anneal and remove stress from glass.
An annealing furnace used to heat and slowly cool glass
'Lehr' is another word for an annealing furnace. This was used for cooling glass slowly to make it stronger and less likely to crack.
Pronounced “Leer,†is an oven of various designs that slowly cools glass objects from forming temperature to room temperature. Glass's property of low heat conductivity makes it very vulnerable to quick temperature changes and produces stresses that fracture the object. Slow cooling allows the heat to be dissipated evenly throughout the entire mass and avoids producing stress. Lehrs vary in design between a simple box that is cooled by a digital controller, to massive devices where the glass travels on a steel mesh belt through zones of decreasing temperature.