Space dyed yarn composite fabric information

Space dyeing yarn refers to dyeing two or more different colors on a skein of yarn or fabric. Introduction to space dyeing yarn The style of the fabric woven by space dyeing yarn has achieved a fundamental breakthrough, so it is deeply loved by Favored by the majority of consumers. Yarns suitable for segment dyeing include: cotton, polyester cotton, acrylic cotton, viscose staple filament, acrylic, rayon, polyester, pure plush thread, nylon thread, nylon staple filament and various blended yarns Dyes that can be used for segment dyeing include: reactive dyes, acid dyes, disperse dyes, paints, etc. Section dyeing yarn process Section dyeing yarn can be mechanical section dyeing or original manual section dyeing. Mechanical segment dyeing can be divided into two types: direct segment dyeing and indirect segment dyeing. Process flow: Warp and weft: cheese → skein → boil yarn → dye → winding, direct segment dyeing, before segment dyeing, the hank yarn undergoes pre-treatment such as desizing, scouring, bleaching, etc. In the boiling and bleaching process, attention should be paid to the amount of alkali used, too much It is easy to reduce the yarn strength, and the impurity removal effect is not ideal if it is too small, which affects the segment dyeing effect and the quality of the woven cloth. The wool effect of the yarn after scouring is not less than 8cm/30min, and the pH is 7-8. If the wool effect is too low, it will affect the penetration of color paste, resulting in poor dyeing; if it is too high, bleeding will occur easily and the outline will be unclear, which will affect the pattern after weaving. 1.1 Paint section dyeing of cotton yarn The paint section dyeing spectrum is complete, the color matching is convenient, the shade is stable, not easy to bleed, the outline is clear, and the process is simple. The disadvantage is that the hand feel is hard. 1.1.1 Process flow: The scoured yarn is dyed in the jet printing section and then steamed (100-102°C, 5-10min) – washed – dried – sizing 1.1.2 Process points: (1) Adhesive: Use externally linked adhesives, such as screen printing adhesives, which have good film-forming feel, high brushing fastness, and high temperature non-yellowing. The dosage should be determined according to the concentration of the paint in the color paste. Generally, the dosage is higher, and the dosage is too high. Less fastness is poor; (2) Emulsified paste: Use oil-water emulsified paste; (3) Coating: The particle size is between 0.2-0.5um. If it is too large, the covering power is poor, the wear resistance is poor, the tone is dull, and the color is light. Reddish; when it is too fine, the brightness will decrease, the coloring amount will decrease, and the paint paste will easily agglomerate; (4) Urea: Adding urea to the color paste will make the color paste thinner, the viscosity will decrease, the color paste will be more stable, and it will not easily To form a film, the dosage should be as small as possible, otherwise the fastness will be reduced, and the edge of the segment dyeing will be seriously infiltrated during steaming; (5) Cross-linking agent: Adding cross-linking agent can improve the abrasion resistance and scrubbing fastness, but the dosage should be Strictly control it, too much will affect the feel. The method of space dyeing is similar to that of fabric printing. 1.1.3 Points of attention in the process: In order to prevent the segment dyeing part from bleeding, the dye is formulated into a color paste and printed onto the yarn through a segment dyeing machine. The temperature during drying should not be too high, and the yarn should be 80% dry when leaving the drying room. The process of segment dyeing of paint is simple and the utilization rate of dye is high. It is also a good method of segment dyeing. 1.2 Reactive dyes for segment dyeing of cotton yarns. Reactive dyes have a complete chromatogram and excellent dyeing fastness. The dyeing of pure cotton yarns mainly uses KE type reactive dyes. However, it was found during production that if KE type is used for segment dyeing, it will wash off. The incoming dyes are easy to stain, resulting in a decrease in dyeing fastness. This may be because the KE type is a dual-reactive base type and is more reactive than the K type. Unreacted dyes and hydrolyzed dyes are easy to stain when washed with water. Therefore, printing dyes are used instead. K-type dyes are reasonably priced, easy to use, and can achieve satisfactory fastness. 1.2.1 Process flow: The scoured yarn is dyed with sizing in the printing section, then steamed (100-102℃, 5-10min) – washed – dried – sizing. 1.2.2 The key points of the process are as follows: (1) Wrap the yarn with dry cloth during steaming to prevent seepage; (2) Use seaweed slurry with medium viscosity to facilitate the color slurry to eject from the nozzle and penetrate into the underlying yarn Medium, 0.25%-0.5% sodium hexametaphosphate can be added when mixing the paste to prevent the influence of calcium ions. At the same time, use soda ash to adjust the pH=7-8. The entire paste must be free of agglomerations; (3) Urea acts as a wetting aid. Because the yarn is directly evaporated without drying after being sprayed with dye sizing, when the amount of urea is large, it will cause serious bleeding. You can add some appropriately for dark colors, but do not add it for medium and light colors; (4) Baking soda As an alkali-releasing agent, the temperature of the paste should be lowered to room temperature before adding when mixing. Otherwise, a large number of bubbles will be generated in the color paste, and the stability of the color paste will decrease, affecting the color amount and dye fastness; (5) The dye dissolution temperature is not consistent Above 90℃, reactive dye segment dyeing has good fastness and good hand feel, so reactive dye segment dyeing is generally used more. Indirect segment dyeing In recent years, multi-color velvet segment dyeing has been widely used in wool spinning enterprises. This equipment can directly segment-dye pure plush yarn, pure acrylic yarn, wool-nitrile blended yarn, etc. It can design special and colorful segment dyeing patterns by changing the length and spacing of the color segments according to the frame length of the skein. The segment dyeing of pure plush yarn is a kind of indirect segment dyeing, which is a segment dyeing yarn made with anti-discharge dyeing technology. 2.1 Features (1) The wider the color segment of segment dyeing, the greater the consumption of color paste; the darker the color, the greater the amount of dye, which is too wasteful of dye; (2) The thickness of the hank segment dyeing yarn cannot be absolutely uniform , using rollers with the same pressure, the colors will be different in places with different thicknesses; (3) As the width of segment dyeing increases, the color difference between the front and back also increases, which reduces the quality of segment dyeing products. These problems can be solved with anti-dye discharge technology. Performance indicators of space-dyed yarn Count: The count of wool yarn is expressed in metric count. Larger count means thinner yarn; smaller count means thicker yarn. The metric count refers to the number of kilometers of yarn in 1kg of yarn. For example, the length of 1kg wool is 18000m, which is 18 counts of yarn.The twist of wool yarn and wool yarn The twist of wool yarn and wool yarn refers to the number of twists per unit length. Twist has twist direction, including “S” twist and “Z” twist. Twist generally refers to the number of twists/m. The count of wool yarn and wool yarn is different, and the twist degree is also different. In order to facilitate the comparison of the twist of wool yarn and wool yarn with different counts, ” The concept of “twist coefficient”. The selection of “twist coefficient” is generally that pure wool is larger than blended yarn, blended yarn is larger than chemical fiber yarn, those with high short hair content are larger than those with low short wool content, and those with fine yarn count are larger than those with thick yarn count. The strength and elongation of wool yarn and wool yarn The tensile capacity of wool yarn and wool yarn is called strength. It is expressed by the load that breaks the yarn. The length of wool yarn and wool yarn that is broken and stretched is called elongation. The strength of wool yarn and pile yarn has a close relationship with the fastness and production efficiency of fabrics. Strength is the basis of fabric strength and elongation. Therefore, the strength and elongation of wool yarn and pile yarn is an important indicator of quality, because the strength and elongation directly affects its quality. , requires appropriate strength and elongation. If it is too large, the wool yarn and yarn will relax and the strength will decrease; if the strength elongation is too small, the strength will increase and the yarn and yarn will become stiff. The strength and elongation of wool yarns and wool yarns vary depending on the raw materials used, the degree of processing, and the arrangement of the fibers. If the raw materials are of good quality, the fibers are arranged neatly, and the twisting is appropriate, the strength of the wool yarns and wool yarns will be higher, and the stretch performance will be better. .
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