Glass fiber was born in the 1930s., Later, with the advent of epoxy resins and unsaturated polyesters that can be combined with inorganic materials, composite materials with new functions have been developed, creating a new era. Today, glass fiber production has developed into an independent industrial system, and its application fields cover all sectors of the national economy such as electronics, electrical appliances, transportation, construction, aviation, aerospace, environmental protection and national defense.
There are two kinds of production technologies for glass fiber cloth. Warp type drawing technology and Tank-kiln wire drawing technology. At present, more than 95% of the glass fibers in the world are produced by Tank-kiln wire drawing technology. Compared with the two kinds of technologies, the Tank-kiln wire drawing technology has the advantages of reasonable production temperature system, energy saving, stable production process and improved product quality. Large-scale production was quickly achieved on Tank-kiln wire drawing process line. The most advanced automatic control technology was quickly implemented, and labor productivity was greatly improved. Therefore, the Tank-kiln wire drawing technology has become the mainstream technology commonly used in the world today.
Warp type drawing technology
Warp type drawing technology is a kind of secondary forming process. The glass raw material is first heated to a molten state, and the molten liquid is made into a spherical shape. And then, the balls are melted again and drawn into a wire. The crucibles used are clay pots, full platinum crucibles, and platinum-plated crucible. Clay pots can only produce high alkali glass fiber from flat glass, full platinum crucible can withstand high temperature and can produce clean and pure glass fiber, but the single furnace needs platinum toluene alloy 3kg to 4 kg, which is expensive. Nowadays, platinum-plated crucible is mainly used, that is, the molten part is a high-temperature resistant clay material. This technology produces a lot of consumption in production, the quality of the products obtained is unstable, the production efficiency is low, etc., but it is very flexible and can supplement all the blanks of the tank-kiln wire drawing.
Tank-kiln wire drawing technology
Tank-kiln wire drawing technology is to send large pieces of raw materials into the factory, and then into a qualified raw material through a series of processes such as crushing, grinding, and sieving, then weigh and mix the ingredients evenly, after passing through the charge end hopper, the batch material is injected into the unit melting furnace through a screw feeder to melt and form a glass liquid. After the molten glass liquid is melted and discharged through the unit furnace, it immediately enters the main passage (also called clarification homogenization or regulatory pathways) for further clarification homogenization and temperature conditioning, then through the transition pathways (also called the distribution pathways) and the working pathways (also called the forming pathways), flow into the tank, and flow through multiple rows of porous platinum drain plates to become fibers, leakage boards generally have 800~4000 nozzles. Its production line is generally divided into two layers. The upper layer is the drain plate drawing operation area, and the lower layer is the winding operation area. Finally, a roving bobbin is produced.
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