History of Heating screens
The screening technique has been associated with Egyptians in early 19s when they implemented the process to separate the basic mineral with the use of mesh as a heating metal that comprises of uniform openings. This method had been used for decades and developed into a series and improved into a series of European patents in 1924 with the use of Nichrome wire mesh for screens.
It was the first time to commercial introduce the heating screen in 1947 when a patent was received for electrically heated screen manufacturing and method. After second world war, the industries expanded. The first commercial use of the heating screen was in the clay industry and soon it became popular for service in the different industries.
Another major discovery for heating screens was clamp bars also called as Wedge Grip that was used to configure the screen on frame. The clamp bars protected a screen to a tensioned rail that in turn improved the electrical connection among two parts.
Over the years, other material used were copper and its wires to upgrade the system. Flexible shunts were used but a major drawback was noticed in connecting the static transformer to the screen that vibrated.
While discovering the options to a vibratory screen, powered heating system was used. It was noticed in 1961, that was unlike to the modern things. The design prevented the use of traditional screens. Discarding the mechanical connection also prevents the feasibility of primary winding failures that cause short circuits on the transformer while avoiding cracks and fatigue on the screen. This design also permitted for transformer shielding and security from elements and debris.
The use of heating screens is preferred for processing the mineral deposits. Heating the screen reduces the surface tension from moisture that is a reason for gumminess against the mesh media. The heat supplied excels the contact area and clears the screen, permitting the finer material separations and precise sizing to increase efficiency.
The heating screens are proven used in fertilizers, foods, chemicals and coal recovery for power production.
Advanced applications of heating screens
Modern uses of heating screens include hot gas filtration, solid-liquid and liquid-gas
screening, support screens, nichrome mesh is used as heating element in ovens, toasters, space heaters and more. These are also used in medical labs for handling the samples as they can withstand quick and repeated sterilization and cool down fast. Fine nichrome wire meshes are used on the industrial scale as filters for handling liquids at the high temperatures. It is also used in kilns for the development of industrial components. The chamber kilns consist of heating coils that are fitted with nichrome wire mesh to keep the coil in its position at the very high temperature.
Nichrome heating screens are also used in solar air heaters to collect the heat and use it to warm up the room air. Good electric resistivity and potential to withstand temperature fluctuations enable Nichrome heating element to serve excellently in these applications. Additionally, another commonly used heating screen is Tungsten mesh cloth.
