space dyed yarn

Space dyed yarn

Space-dyed yarn refers to dyeing two or more different colors on one skein of yarn or fabric. Introduction to space-dyed yarn The style of the fabric woven by space-dyed yarn has achieved a fundamental breakthrough , so it is favored by the majority of consumers. Spinning yarns suitable for segment dyeing include: Cotton, polyester cotton, nitrile cotton, viscose staple filament, polyacrylonitrile fiber, rayon, polyester yarn, pure plush yarn, nylon yarn, nylon staple filament and various other yarns. The dyes that can be used for segment dyeing of blended chemical fiber fabric yarn include: reactive dyes, acid dyes, disperse dyes, coatings, etc. Space-dyed yarn spinning process Space-dyed yarn can be machine space-dyed or original manual space-dyed. Mechanical segment dyeing can be divided into two types: direct segment dyeing and indirect segment dyeing. Process flow: Warp and weft: cheese yarn → skein → boil yarn → color → winding, direct segment dyeing. Before segment dyeing, the hank yarn undergoes pre-treatment such as desizing, scouring, and bleaching. During the boiling and bleaching process, attention should be paid to the amount of alkali used. Too much will simply reduce the strength of the spinning yarn, and too little will have unsatisfactory impurity removal effect, affecting the segment dyeing effect and the quality of the woven fabric. The wool efficiency of the spun yarn after scouring is not less than 8cm/30min, and the pH is 7-8. If the wool efficiency is too low, it will affect the penetration of the color paste, resulting in poor coloring; if it is too high, it will easily bleed and the outline will be unclear, which will affect the pattern after weaving. . 1.1 Coating section dyeing of cotton yarn The coating section has a complete color spectrum, convenient color matching, stable color finish, not easy to bleed, clear outline, simple process, but the disadvantage is that the hand feel is hard. 1.1.1 Process flow: After scouring, the dyed slurry in the spray printing section of the spinning yarn is steamed (100-102℃, 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 no yellowing at high temperatures. The dosage should be determined according to the concentration of the paint in the color paste. Generally, the dosage is higher. If too little, the fastness will be poor; (2) Emulsified paste: Use oil-water emulsified paste; (3) Paint: The particle size is between 0.2-0.5um. If it is too large, the covering power will be poor, the wear resistance will be poor, and the color will be dull. The color will turn reddish; when it is too fine, the brightness will decrease, the amount of color will be reduced, 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, and the color paste will be more stable. , is not easy to form a film, so the dosage may be small, 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 controlled, as too much will affect the feel. The method of space dyeing is similar to that of fabric printing. 1.1.3 Points to note 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 spinning 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 color fastness. The coloring of pure cotton yarns mainly uses KE type reactive dyes. However, it was found during production that if KE type is used for coloring, For segment dyeing, the washed dye is easily stained, resulting in a decrease in color 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 easily stained during washing. , for this reason, K-type dyes for printing are used, which are reasonably priced, easy to use, and can achieve satisfactory fastness. 1.2.1 Process flow: After scouring, the scouring section of the spinning yarn is dyed and steamed (100-102℃, 5-10min) – washed – dried – sizing. 1.2.2 The key points of the process are as follows: (1) Wrap the spinning 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 lower spinning layer. In the yarn, 0.25%-0.5% sodium hexametaphosphate can be added when adjusting the size 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 moistening Wet dissolving effect, because the spinning yarn is sprayed with dye paste and steamed directly without drying. When the amount of urea is large, it will cause serious bleeding. For dark colors, you can add some appropriately, but for medium and light colors, you don’t need to add it; (4 ) Baking soda is used as an alkali-releasing agent. When mixing colors, you should wait until the temperature of the paste drops to room temperature before adding it. Otherwise, a large number of bubbles will be generated in the color paste, and the stability of the color paste will decrease, which will affect the coloring amount and color fastness; (5) The melting temperature of dyes does not exceed 90°C. Reactive dye segment dyeing has good fastness and good hand feel. Therefore, reactive dye segment dyeing is generally used more often. 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 and acrylic blended chemical fiber fabric yarn, etc. It can design unique 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 yarn in hank segment dyeing cannot be absolute Evenly, using a roller with the same pressure, the color will be different where the thickness is different; (3) As the width of segment dyeing increases, the color difference between the front and back also becomes larger, which reduces the quality of the segment dyeing product. These problems can be solved with anti-dye discharge technology. Performance indicators of segment dyeing yarns Count: The count of wool yarn is expressed in metric count, count ���, the yarn is thin, the count is small, and the yarn is thick. 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 choice of “twist coefficient” is generally that pure wool is greater than blended chemical fiber fabric yarn, blended chemical fiber fabric yarn is greater than chemical fiber yarn, those with high short hair content are greater than those with low short hair content, and those with fine yarn count are greater 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 spinning yarn. The length of the 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 stretch of wool yarn and wool yarns vary depending on the raw materials used, the degree of finishing, 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 stronger the wool yarns and wool yarns will be, and the better the stretch performance will be. .
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