Permanent flame-retardant thread is made by adding flame-retardant material in the process of chip melting and spinning, which makes the material have permanent flame retardancy and washability.
Permanent flame-retardant thread can be divided into polyester long fiber thread, nylon long fiber thread and polyester short fiber thread.
Long-fiber and high-strength polyester thread is generally made of high-strength and low-elongation polyester filament (100% polyester fiber) as raw material, which has the characteristics of high strength, bright color, smoothness, acid and alkali resistance, wear resistance, corrosion resistance, high oiling rate, etc. However, it has poor wear resistance, is harder than nylon thread, and will emit black smoke when burning.
Long-staple nylon sewing thread is made by twisting pure nylon multifilament (continuous filament nylon fiber). Nylon thread, also known as nylon thread, is divided into nylon 6(Nylon 6) and nylon 66(Nylon 66). It is characterized by smoothness, softness, elongation of 20%-35%, good elasticity and white smoke when burned. High wear resistance, good light resistance, mildew resistance, coloring degree of about 100 degrees, low temperature dyeing. It is widely used because of its high seam strength, durability and flat seam, which can meet the needs of a wide range of sewing industrial products. The disadvantage of nylon sewing thread is that its rigidity is too high, its strength is too low, its stitches are easy to float on the surface of the fabric, and it is not resistant to high temperature, so the sewing speed cannot be too high. At present, this kind of thread is mainly used for decals, skewers and other parts that are not easily stressed.
Polyester staple fiber is made of high-strength and low-elongation polyester raw material, with hairiness on the surface, hairiness in appearance and no light. Temperature resistance of 130 degrees, high temperature dyeing, burning will emit black smoke. It is characterized by abrasion resistance, dry cleaning resistance, stone grinding resistance, bleaching resistance or other detergent resistance, and low expansion rate.
Long-fiber high-strength wires are generally expressed in the form of [denier/number of strands], such as: 150D/2, 210D/3, 250D/4, 300D/3, 420D/2, 630D/2, 840D/3, etc. Usually, the larger the d number, the thinner the wire and the lower the strength. In Japan, Hongkong, Taiwan Province and other countries and regions, 60#,40#,30# and other designations are commonly used to express the thickness. Generally, the larger the numerical value, the thinner the line and the smaller the strength.
20S, 40S, 60S, etc. in front of the staple sewing thread model refer to the yarn count. The yarn count can be simply understood as the thickness of the yarn. The higher the yarn count, the thinner the yarn count. 2 and 3 at the back of the model “/”respectively indicate that the sewing thread is formed by twisting several strands of yarn. For example, 60S/3 is made by twisting three strands of 60 yarns. Therefore, the higher the number of yarns with the same number of strands, the thinner the thread and the smaller its strength. However, the sewing thread twisted with the same number of yarns, the more strands, the thicker the thread and the greater the strength.
Post time: Dec-12-2022