What are the commonly used sewing threads for PVC three-proof tarpaulins?

Generally, PVC three-proof tarpaulins are wholesaled in the plastic tarpaulin wholesale market. Some merchants will remind sellers that if the Chongqing tarpaulin is damaged and needs to be repaired by machine, whether the repaired tarpaulin is suitable for use. , There should be a distance of 15mm to 20mm between the outer suture and the periphery of the patch cloth, and the distance between the two sutures should be 10mm. If the two-sided straight double-thread machine is used, the distance between the two sutures close to the pressing rope should not be less than 45mm, and the middle of the tarpaulin should be properly arched after sewing, so that the pressing rope can pass through, the needle and the The return needle at the needle stop should not be less than 50mm. At the same time, it should be noted that waterproof glue should be painted on both sides at the eye of the machine repair needle. Relevant water hoisting test is required for the repaired part, and water seepage, smearing and water leakage are not allowed; and after repairing, the middle of the rope cloth should be properly arched to make it easy for the waist rope to pass through. The tension of the suture should be uniform and straight, and the needle size should be 14-18 stitches/100mm. At the same time, pay attention to not less than 3 stitches at the starting and ending points. After being used for a long time, the PVC three-proof tarpaulin is prone to damage. At this time, it needs to be repaired, and sewing thread is used for repairing. Due to the development of containers and covered trucks, it is less suitable for touch. Through the selection of base fabric texture, the research of coating formulation and the optimization of process conditions, the contradiction between flame retardancy and cold resistance of tarpaulin is solved, and the aging resistance performance of the product is proposed, which prolongs the service life, and its main performance exceeds that of railway standard level. The flame retardant of tarpaulin includes vinylon canvas and pvc coating. Due to the high cost of reactive flame retardants and the complicated process, this study uses additive flame retardants to add pvc coatings to make them flame retardant, and pvc itself has resistance. In order to ensure the cold resistance of the tarpaulin, it is necessary to add a plasticizer. Adding flame retardants can improve flame retardancy, but reduce cold resistance, so solving the contradiction between flame retardancy and drought resistance of products is the key to technology. What are the commonly used sewing threads for PVC three-proof tarpaulins? (1) Nylon sewing thread: strong elongation, good elasticity, smooth texture, silky luster, excellent abrasion resistance. (2) Silk thread: smooth surface, soft luster, good elasticity and high temperature resistance. It is used to sew woolen garments and satin fabrics; rayon has bright colors, but poor strength, poor moisture absorption, and relatively cheap price. Mostly used for machine embroidery. (3) Cotton sewing thread: It has good heat resistance, elasticity, abrasion resistance, moisture resistance and anti-bacterial ability. It is suitable for high-speed sewing and durable pressing. (4) Polyester-cotton sewing thread: Polyester sewing thread: high strength, flat and beautiful stitches, anti-wear; no mildew or rot, low price, rich colors, not easy to fade, not shrinking. (5) Vinylon thread: low price, high breaking strength, lower abrasion resistance than nylon thread, good chemical stability, mainly for sewing various flour bags, cloth rubber shoe uppers, canvas, buttonholes, buttons, etc. (6) Nylon yarn: high breaking strength, good abrasion resistance, low hygroscopicity, high elasticity, but not enough heat resistance, generally controlled at about 120 ℃. Generally used for sewing chemical fiber fabrics, woolen wool, sweaters, etc. The production of PVC three-proof tarpaulin is different according to the process, and the canvas is constantly improving in the material ratio, so that the damage to the cloth blank is small, and the tensile force will be better; the warp and weft density of the yarn is high, and the tensile force is stronger. It is very soft to the touch, although the thickness seems to be average, but in fact the thickness has reached the requirement, just because the resin composition is high and the processing technology is good, so it feels very soft and does not feel rough. Using vertical machine production, vertical machine production, straighten the cloth into the raw material box and pull out, the glue material on the sheet is high-quality PVC material, and then both sides are straightened through the machine and scraped with a knife. After scraping with a knife, it is dried in a dryer, trimmed, divided into circles, and packaged. There are two types of dryers, one is electric burning and the other is boiler. The vertical machine has high requirements on raw materials, and it is necessary to have a corresponding degree of distance from the raw materials. The PVC canvas produced by the vertical machine is often slightly more expensive, and the quality of the canvas product is also high. With polyester filament as the base fabric, the surface is PVC double-sided coating, and the excellent environmental protection resin is carefully selected. The surface is smooth and bright, and the color is bright. and other properties; it has waterproof, anti-sunshine, anti-mildew, reinforced silk production, tear resistance, cold resistance, high temperature resistance, etc.
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