Exploring the World of Glass: From the Craftsmanship of Rolled Glass to the Analysis of Melting Temperature vs. Softening Temperature

Exploring the World of Glass: From the Craftsmanship of Rolled Glass to the Analysis of Melting Temperature vs. Softening Temperature

Glass is an ancient building material that emerged as early as the time of ancient Egypt. Evolving alongside human society, the glass industry has created various types of glass with unique functions, continuously expanding the glass family. For example, bulletproof glass, photoelectric glass, and vacuum glass all play irreplaceable roles in their respective fields. This article will detail the definition, manufacturing process, performance characteristics, and application areas of rolled glass; and delve into the relationship between glass's melting temperature and softening temperature, clarifying which one is higher.

I. Overview of Rolled Glass

Rolled Glass, also known as Patterned Glass, is a type of flat glass manufactured using the rolling method. It gets its name from the concave-convex patterns or designs on its surface. — This type of glass not only possesses a certain degree of light transmission but also effectively obscures vision, providing privacy. — At the same time, it also has a decorative effect.

II. Manufacturing Process of Rolled Glass

The manufacturing process for patterned glass is mainly divided into two methods: the single-roll method and the double-roll method:

1. Single-roll method: — Molten glass is poured onto a rolling table, usually made of cast iron or cast steel. The table surface or the roller is engraved with pre-designed patterns. — Subsequently, the roller presses onto the surface of the molten glass, imprinting the pattern onto it. — The resulting patterned glass is then sent to an annealing lehr for slow cooling to eliminate internal stress.
2. Double-roll method: — This is further divided into semi-continuous rolling and continuous rolling processes. — In this method, molten glass passes through a pair of water-cooled rollers. As the rollers turn, the glass is drawn forward towards the annealing lehr. — Typically, the lower roller has a concave-convex pattern on its surface, while the upper roller is a smooth, polished roll; this produces patterned glass with a design on a single side.

III. Properties and Applications of Rolled Glass

The physical and chemical properties of patterned glass are essentially the same as those of ordinary clear flat glass; its main characteristic lies in its optical property of being translucent but not transparent. — This characteristic causes light to undergo diffuse reflection as it passes through, becoming soft and comfortable; — simultaneously, it effectively blocks the line of sight, offering a degree of privacy. — Therefore, it is widely used for interior partitions in buildings, doors and windows in bathrooms, and various other situations where light transmission is needed, but vision needs to be obstructed.