Under normal circumstances, small (thin) needles should be used for sewing thin, brittle and dense sewing materials, and large (thick) needles should be used for sewing thick, soft and sparse sewing materials. The thick needle for sewing thin material will be caused by the large friction between the needle and the sewing material. When the needle is raised, the sewing needle will rise in the presser foot, delaying the formation of the loop, thus causing the jump stitch; If the fine needle is selected during the material, it will be very important to select the needle scientifically and reasonably for the clothing style of the needle bending or broken needle, different fabrics and different sewing parts.
At present, the high-speed sewing machine for sewing processing can reach a speed of 5000 rpm, and the speed of the needle penetrating the fabric can reach 4 m / s. In such a high-speed sewing process, the sharp friction of the needle and the sewing machine will be As a result, the needle needle temperature is too high, and a serious melt hole may be formed in the chemical fiber fabric or the chemical fiber suture may be melted, and the resistance of the needle hole crossing line may be increased, so that the condition of the needle thread breaking condition is deteriorated, and the clothing style of the jump stitch or the broken thread is different. It is very important to choose the needle scientifically and reasonably for the fabric and the different sewing parts.
During the sewing process, the needle passing through the fabric at high speed may cut the yarn in the fabric at any time to cause mechanical damage to the fabric. Serious mechanical damage may cause the strength of the fabric and the seam to decrease, affecting the appearance and durability of the garment. Generally speaking, The fabrics with high density, tight structure and mechanical reinforcement of the reinforced fabric are more prominent in the sewing process, while the sewing damage of the staple fiber yarn fabric is relatively slight.
In recent years, in order to adapt to the diversification of the performance of apparel fabrics, especially the "new synthetic fiber" fabrics emerge in an endless stream, the garment industry has transformed the shape of the needle bar and the shape of the needle tip. For example, U-shaped cross-section needles made by “Shengjia†using flow extrusion technology have a needle bar strength that is 90% higher than that of conventional round-section needles. The "IT" series of needles developed by the Japanese "Accord" company can reduce vibration and play a good role in preventing jump stitches. The “NS†series of needles introduced by “Qinqin†has a thin and long needle tip, which is designed to solve the problem of seam wrinkling and spinning in chemical fiber fabrics. In order to solve the problem of needle thermal damage, the needle is directly blown, the shape of the needle tip is changed, and the streamline groove is formed on the needle bar, and the air through hole cooling device with the hollow needle is developed; the surface of the needle is specially treated even if it occurs Melting does not adhere to the needle. In addition to the introduction of chrome-plated needles, Groz, which has 150 years of needle-making experience, has also introduced titanium-plated nitrogen alloys and nickel-Teflon alloy needles to meet the diverse fabrics.
Aluminium chloride (AlCl3), also known as aluminium trichloride, is the main compound of aluminium and chlorine. The solid has a low melting and boiling point. It is mainly produced and consumed in the production of aluminium metal, but large amounts are also used in other areas of the chemical industry. The compound is often cited as a Lewis ACID.
Aluminum chloride, solution appears as a straw-colored liquid. Denser than water. Contact may cause severe irritation to skin, eyes, and mucous membranes. May be toxic by ingestion.
Aluminum chloride, anhydrous appears as a white to gray powder with a pungent odor. Corrosive to tissue and toxic by ingestion.
Aluminium Chloride Anhydrous,Aluminium Chloride Anhydrous 99%,aluminium trichloride
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