brief analysis of dyeing and finishing process of colored cotton mercerized knitted fabric products-pg电子游戏下载

kunshan xinlianfang knitting co., ltd. mainly deals in the textile and knitting industry. the knitting raw materials include natural fiber, chemical fiber, cotton yarn, wool yarn, blended yarn, color spinning yarn, fancy yarn and others.

colored cotton does not require traditional dyeing, so the colored yarns and textiles made from it do not contain residual formaldehyde, banned dyes and heavy metals and other harmful substances, and also avoid environmental pollution during the production process. today, in the pursuit of green consumption returning to nature, natural colored cotton products have been used in close-fitting clothing and towels that are in direct contact with the skin, bedding and other bedding. correspondingly, the production of its products must be: the various processes and processes in the process must be strictly implemented in order to maintain the environmental characteristics of “zero pollution” of the products, and maintain the softness and sweat absorption of the cotton fabrics. comfortable and natural. through reasonable finishing, it has antibacterial, anti-shrinkage and other functions, thereby maximizing the added value of colored cotton products.

dyeing and finishing process

the grey fabric is a two-color jacquard knitted fabric: 18.4 tex (32) / 1 brown cotton, 18.4 tex (32) / 1 white cotton.

process: grey cloth→ singeing→refining→drying→silk→water washing→super-feeding wet expansion→drying→opening→rolling finishing→fixing→pre-shrinking→inspection→packaging

singeing

singeing is to remove the hairiness of the fabric and improve the gloss of the fabric. the equipment is selected from the sma cylinder knit singeing machine of lindauer-dornier of germany. the machine fully expands the circular knitted fabric by a circular expander, so that the fabric coil is evenly opened, so that not only the hairiness of the surface but also the hairiness between the yarn and the yarn can be removed, so that the fabric texture clear, it helps to improve the luster of the fabric.

concise

the impurity content of colored cotton fiber is about 2 to 5 times that of ordinary white cotton, so it is necessary to strengthen the refining strength to remove cottonseed hulls and impurities, so that the natural color of colored cotton is fully manifested. it should be noted that the color of the colored cotton product may vary greatly under different alkaline agents, working fluid ph, operating temperature and time conditions: when the ph value is less than 7, the color will be yellowish; when the ph value is greater than 7, the color will be blue. the refining process is determined by a small sample test, and the refining process is determined through production tests. the tubular knitted fabric is often processed in a rope shape, so the refining equipment is selected from a normal pressure overflow jet dyeing machine. the equipment is driven by a high-pressure sprayed working fluid to circulate the fabric to ensure that the working fluid is in full contact with the fabric to ensure a refined effect. after the scouring is completed, sufficient water washing is required to make the fabric have good water absorption to ensure the penetration effect of the subsequent finishing. the hot air relaxation drying on the vertical tubular dryer allows the fabric to be dried under as little tension as possible, facilitating its natural retraction.

mercerized

mercerizing improves the gloss of the fabric and achieves dimensional stability. mercerizing was carried out on a dornier cylinder fabric mercerizing machine.

washed

the water washing after mercerizing is to remove the mercerized residual alkali, making the fabric neutral and ensuring the luster of the fabric. when neutralizing with acetic acid, note that the ph of the working fluid in the cylinder is between 6 and 7. at the end of the water wash, it is also important to note that the ph of the working fluid in the cylinder is between 7 and 7.5 to keep the color as stable and consistent as possible. especially in large-volume multi-cylinder production, if the customer has high requirements on soaping fastness and perspiration fastness, it can be considered to fix the brown cotton with a formaldehyde-free fixing agent. subsequent drying is still carried out by slack drying on a vertical tubular dryer, but before the water is dried after mechanical centrifugation, an overfeed and wet expansion is carried out on the expander. the purpose is to stretch the fabric in the transverse direction to produce some retraction in the longitudinal direction to eliminate as much as possible the longitudinal stretching caused by the rope processing in the previous multiple steps, which helps to reduce the final shrinkage of the fabric.

shape

the main purpose of the shaping process is to make the fabric have a certain width and weight, and have a good shrinkage, cloth style and feel. in addition, antibacterial, anti-shrinkage and other finishing can be carried out at the same time to increase the added value of the product. the hot air tenter type setting machine is more suitable, and the finishing liquid is rolled before shaping. the shaping process is shown in table 4.

in order to ensure the durability of the antibacterial properties of the fabric, it is considered to add an appropriate amount of acrylic glue to the rolling liquid. the amount is generally 5 to 7 g / l, can not be too high, the amount of high will affect the feel of the fabric and so on. if customers have high requirements for light fastness, they can also be considered for uv protection to improve their light fastness. after shaping, in order to further reduce the shrinkage rate of the fabric, the knitting pre-shrinking machine can be used for mechanical pre-shrinking finishing. the process flow is a short-range super-feeding tenter, followed by steam to wet, then the rubber blanket is pre-shrinked, and finally finished by a drying cylinder.