kunshan xinlianfang knitting company is mainly engaged in the textile and knitting industries. the raw materials for knitting include: natural fiber, chemical fiber, cotton yarn, wool yarn, blended yarn, colored spinning yarn, fancy yarn, and others.
colored cotton does not require traditional dyeing processing, so colored yarns and textiles made from it will not contain residual formaldehyde, banned dye additives, heavy metals and other harmful substances, and it also avoids environmental pollution during the production process. in today's advocating green consumption of returning to nature, natural colored cotton products have been used in a series of close-fitting clothing and bedding such as towels and quilts that directly contact the skin. correspondingly, the production of its products must be done: each process and each process in the processing process must strictly implement green production to maintain the environmental protection characteristics of its products of "zero pollution", and maintain the softness, sweat absorption, and absorption of pure cotton fabrics. the advantages of comfort and nature. through reasonable finishing and processing, it has anti-bacterial, anti-shrinkage and other functions, thereby greatly improving the added value of colored cotton products.
dyeing and finishing process
grey fabric varieties are two-color jacquard knitted fabric: 18.4tex (32 counts)/1 brown cotton, 18.4tex (32 counts)/1 white cotton.
technological process: grey cloth → singeing → scouring → drying → mercerizing → washing → overfeeding wet expansion → drying → opening → rolling finishing liquid → shaping → pre-shrinking → inspection → packaging
singeing
singeing is to remove hairiness on the cloth surface and improve the luster of the fabric. the equipment selects the sma circular knitted fabric singeing machine of germany lindauer-dornier company. the machine fully expands the circular knitted fabric through the circular expander, so that the fabric loops are evenly opened, so that not only the surface hairiness can be removed, but also the hairiness between the yarn and the yarn can be removed to make the cloth surface 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 scouring to remove cotton seed hulls and impurities, so that the natural color of colored cotton can be fully displayed. it should be noted that the color of colored cotton products will change greatly under the conditions of different alkaline agents, working fluid ph values, temperature and time of action: when the ph value is less than 7, the color will be yellow; when the ph value is greater than 7, the color will be bluish. the scouring process is determined through the sample test, and the scouring process is determined through the production test. tubular knitted fabrics are often processed in rope shape, so the scouring equipment uses atmospheric overflow jet dyeing machine. the equipment uses a high-pressure jet of working fluid to push the fabric to move cyclically to ensure that the working fluid is in full contact with the fabric to ensure the scouring effect. after the scouring is completed, sufficient water washing should be carried out to make the fabric have good water absorption to ensure the penetrating effect of the subsequent mercerizing finishing. the hot air relaxation drying on the vertical cylindrical dryer can make the fabric dry under the smallest possible tension and facilitate its natural shrinkage.
mercerized
mercerizing can improve the luster of the fabric and obtain the dimensional stability of the fabric. the mercerizing is performed on the dornier cylindrical fabric mercerizing machine.
water wash
the washing after mercerizing is to remove the residual alkali from mercerizing, make the fabric neutral, and ensure the luster of the fabric. when neutralizing with acetic acid, pay attention to the ph value of the working fluid in the cylinder between 6 and 7. at the end of water washing, pay attention to the ph value of the working fluid in the tank between 7 and 7.5 to keep the color as stable and consistent as possible. especially in the mass production of multi-cylinders, if customers have high requirements for soaping fastness and perspiration fastness, they can consider using formaldehyde-free fixing agent to fix brown cotton. the subsequent drying is still carried out on the vertical cylindrical dryer for relaxation drying, but before the water drying after the mechanical centrifugal removal, an overfeeding wet expansion is carried out on the expansion machine. the purpose is to make the fabric stretch in the transverse direction, thereby producing some shrinkage in the longitudinal direction, so as to eliminate as much as possible the longitudinal stretch caused by the rope processing of the previous multiple processes, which helps to reduce the final shrinkage rate of the fabric.
shape
the main purpose of shaping processing is to make the fabric have a certain width and weight, better shrinkage, fabric style and feel. in addition, anti-bacterial and anti-shrinkage finishing can also be carried out at the same time to increase the added value of the product. it is more suitable to use hot-air stenter setting machine, and the finishing liquid before setting is rolled. the shaping process is shown in table 4.
in order to ensure that the antibacterial properties of the fabric have better durability, consider adding an appropriate amount of acrylic glue to the rolling solution. the dosage is generally 5-7g/l, and it should not be too high. a high dosage will affect the feel of the fabric. if customers have higher requirements for light fastness, they can also consider anti-ultraviolet finishing to improve their light fastness. after setting, in order to further reduce the shrinkage rate of the fabric, a knitting preshrinking machine can be used for mechanical preshrinking. finished by drying drum blanket.
