What is the art of light industry
viscosity modifying agent, stabilizer, suspension stabilizer, agent for bleeding and sedimentation Shanghai Na Long Tech Co., Ltd , https://www.na-long.com
The art of light industry, particularly in glassworking, involves the manipulation of glass tubes as a base material. Using specialized torch flames, artisans perform techniques such as bending, blowing, pressing, and welding by leveraging the thermoplastic properties of heated glass. This process is a secondary thermal shaping method used in the production of various glass instruments and products, including thermometers, vacuum flasks, bulbs, syringes, ampoules, control bottles, and electric vacuum devices. Depending on the object being processed, this technique can be categorized into three main types.
First, glass deformation processing involves heating and softening the glass so that it can be shaped using external force or air pressure. This includes operations like bending, blowing, stretching, rotating, and sealing the bottom of the tube. Examples include the core of a condensing tube, a serpentine core, the vitreous bottom of a vacuum flask, and the rounded bottom of a test tube.
Second, glass parts are welded together after being fired. This process combines and shapes individual components to form a single, integrated piece, such as pipe fittings, T-joints, inner and outer sleeves, and mouth rings. When welding the same type of glass, the process is generally safe. However, when different types of glass with varying thermal expansion coefficients are used, the difference in shrinkage during cooling can create structural stress, potentially leading to cracking or breaking. For example, quartz glass and regular glass can be challenging to weld due to their differing thermal expansion rates. To avoid this, intermediate glasses with similar expansion coefficients are often used. Ideally, the difference between the two glasses should be less than 6 × 10â»â· /°C.
Third, glass parts are sealed with metal. The best approach is to use a glass that has a thermal expansion coefficient close to that of the metal. If there is a significant mismatch, alternative methods such as using intermediate transition glass, soft metal filaments, or thin metal foils can help compensate for the stress at the seal. These materials allow for some flexibility, reducing the risk of breakage caused by thermal stress.
Features: The art of glassworking showcases both beauty and precision, blending science and craftsmanship into stunning, functional pieces. Whether it's a delicate bulb or a complex vacuum device, each creation reflects the skill and creativity of the artisan.