Needle bar is an important component of a Warp Knitting Machine. It is a long, thin metal bar that holds the needles used to form the knitted fabric. The needle bar is mounted on the machine and moves up and down, allowing the needles to pass through the yarn and create the stitches.
The needle bar is a critical component of the warp knitting machine, and must be carefully maintained to ensure that the needles are properly aligned and functioning correctly. Regular cleaning and lubrication are essential to prevent wear and tear on the needles and the bar itself.
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The relevant experts pointed out in this analysis that the main reasons for the development of the two major industrial chains of fluorine and silicon in the same region are that methane chloride is used as a raw material, and that after cracking into monomers, they are all produced by-products of hydrogen chloride (HCL). Since HCL only plays a mediating role in the monomer processing of the two major industrial chains, increasing the atomic economy of chlorine (doing a good job in the recycling of byproduct hydrochloric acid) will help improve the overall efficiency of China's fluorosilicon industry. .
According to expert analysis, in recent years, the integration process of the two major industries of methane chloride and organic silicon can be roughly divided into four types:
The first category extends from methane chlorides to silicones and fluorine materials. The representative company is Jiangsu Meilan Group. The group originally started from the electrochemical plant. After years of development, it has formed a complete industrial chain from chlor-alkali to methane chloride to organic silicon and fluorine materials. While taking advantage of the industrial chain, Meilan Group has comprehensively promoted the integrated innovation of the industrial chain and entered into technology-intensive, high-value-added products. Its 120,000 tons/year ultra-high-purity methane chloride project is currently producing methane on the international market. Chloride is the most advanced methanol process.
The second category is the extension of fluorinated materials to methane chlorides. The representative company is Shandong Dongyue Group. At the beginning of this century, the Group’s rapid development of refrigerants and tetrafluoroethylene, but there have been difficulties due to the large number of imports of chloroform, but not limited production. So Dongyue used 5 years to develop the methane chloride from zero to 120,000 tons, and the final output would reach the level of 300,000 tons. The extension of this industry chain is not only the use of methane chloride, but it has developed into chlor-alkali, thermal power plants and salt fields.
The third category is regional support or intra-group mutual supply. A typical example is the Yanhua Group's inclusion of Sichuan Honghe Fine Chemicals and the provision of methane chloride and R22 to the Chenguang Research Institute in the same city. In addition, Jiangsu Changshu Fluorinated Chemical Industry Park also has supporting enterprises specialized in the production of methane chloride.
The fourth category was developed from the initial comprehensive utilization of resource cycles. Typical representative is Zhejiang Xin'an Chemical Group. The group started with the production of glyphosate, initially to solve large quantities of by-product hydrochloric acid, and launched small-scale silicones. The hydrochloric acid, a by-product of organic silicon, is returned to pesticides as a raw material to form a unique recycling chain of chlorine atoms. Now, silicone has become the head of Xinan Chemical.
Foreign companies have a practice that makes organic fluorine, rarely silicones; likewise, silicones are rarely made of organic fluorine. Many experts explained that the main difficulty in the development of these two major industries was in the development of downstream products rather than monomers. Once you enter the downstream development, it is very difficult to determine which industry chain to use.
Why does China appear to have many organic fluorine-silicon integrated development companies? First, China's fluorosilicic resources are abundant and often occur in the same area. Second, compared with developed countries, although China's organofluorine and silicon industries are developing rapidly, the overall level of organofluorine-silicon industry is still only at the monomer and primary polymer stage. It is at this stage that the cost of raw materials and the recycling efficiency of by-products are particularly important. According to reports, the greatest benefit of organic fluorine and silicon integrated development is that it can realize the recycling of chlorine atoms, and the specific point is to realize the recycling of byproduct hydrochloric acid. In this regard, the utilization rate of China is obviously low and must be resolved.
According to a technician from Shandong Dongyue Group, the company's methane chloride plant currently produces chloroform, which inevitably produces carbon tetrachloride. Now, carbon tetrachloride can no longer be sold to outside companies and can only be converted to methyl chloride through a 12,000-ton/year carbon tetrachloride conversion plant, which is neither profitable nor well-balanced. Once this year's 60,000-ton organic silicon project is put into production, this part of the product will be able to make up for the shortage of methyl chloride needed by the organic silicon.
Due to the independent support of fluorosilicone companies and the addition of foreign fluorosilicone companies, the competition in China's methane chloride and organic fluorosilicon industry has further intensified. In the face of the high yield of byproduct hydrochloric acid, domestic companies are now seeking resources for their development, instead of being taken as by-products.
The needle bar typically has a series of holes drilled into it, with each hole holding a single needle. The needles are usually made of steel and have a hooked end that catches the yarn and pulls it through the fabric. The number of needles on the bar can vary depending on the machine and the type of fabric being produced.
In warp knitting machines, the needle bar is typically located above the warp yarns, which are held under tension by a series of guides and rollers. As the needle bar moves up and down, the needles pass through the warp yarns, creating loops that are held in place by the tension of the yarns.
Organic fluorosilicon integration gradually becomes a trend
In recent years, many domestic well-known fluorine chemical production enterprises have rapidly increased their self-sufficiency in methane chloride, and they have been targeting the silicone industry for development. There has been a trend of integrated development of organic fluorine and silicon with Chinese characteristics: following last year's Jiangsu Mei After the Lanzhou Group's 25,000-ton organic silicon plant went into production, Zhejiang Juhua Group and Shandong Dongyue Group also built 60,000-tonne units respectively, and they are expected to start production in the second half of this year.