Knitted fabrics are usually dried in the overflow tank. During the whole process, the fabrics are kept in a rope state. The fibers are continuously bent and deformed in the dyeing machine. The original hydrogen bonds are continuously destroyed, and new hydrogen bonds are continuously formed. Sometimes, newly formed hydrogen bonds cannot be completely recovered, so chicken paw prints and dead creases are formed on the surface of the fabric . In the single-faced fabric structure, the tension of the two-sided yarn is asymmetrical, and the fabric is difficult to recover after long-term crease of the fabric, so that the fine crease problem is more likely to occur in plain weave, sweater, single bead, and the like in various structures. The production of fine creases is also closely related to the yarn count and twist. The younger the yarn count, the higher the twist, the greater the reverse twist of the yarn, and the concentrated reflection on the cloth surface is the problem of fine crease. The general dyeing and finishing process is: preparation of cloth → seam head → falling cylinder boiling and bleaching → dyeing → soaping → fixing color → soft → out of the cylinder → dehydration → shock wave machine or air dryer dry cloth , and the formation of fine creases is mainly It is in the dyeing tank, in the dewatering machine, in the stacker, and according to its forming conditions, it is mainly improved from the following aspects:  Predetermined type By predetermining the fiber proximity and orientation, the microstructure and morphology of the fabric change when the fabric is heat-set. When the fabric is shaped, the fabric is fully stretched and shaped under high temperature, and the fiber morphology is fixed, which reduces the occurrence in the dyeing tank. The chance of change helps to reduce creases.  Eliminate internal stress before falling into the cylinder After loosening the cloth, it is fully slack in the stacker. The grey cloth is generally stored in the warehouse. The relative humidity in the warehouse is low. The cloth is stacked in a very dry state for a long time. It is easy to produce indentation. After the loose cloth, it should be Placed in a place with high humidity in the workshop to fully regain moisture, the fiber will swell in the resurgence, and the internal stress will be partially eliminated; It is eliminated by the J-shaped groove, and after it is loosened, it is allowed to pass through the J-shaped groove freely, and at the same time, the original hydrogen bond is changed by the pressing of the pressing roller or the roller drawing, which is beneficial to eliminate the internal stress; The fabric crease is generally cylindrical by flat stretching and superheated water. The knitted fabric is generally cylindrical, and the fabric can be fully widened by the guide ring, and the steam or the hot water tank is sprayed to reduce creases and superheated water. In order to fully wet the cloth, a certain penetrant and a smoothing agent may be added.  Bleaching and dyeing Pay attention to the amount of dyeing cylinders. When discharging, generally reduce the dyeing cylinder by 10-15%. Do not overload the fabric. When the cloth is too large, the fabric is severely pressed in the storage tank. It cannot be stretched at the nozzle. Easy to form indentations; Pay attention to the temperature rise and fall rate. When the temperature rises or decreases the temperature too fast, the temperature of the cloth body is prone to unevenness. When concentrated on the fiber, the fiber has different degrees of heat and cold, and the shrinkage is uneven. Especially when the temperature is lowered, it is easy to be locally quenched. The form is solidified to form wrinkles that are difficult to remove. Therefore, after the high temperature process, the temperature is generally lowered to 70 ° C at a rate of 1-1.5 / min, or directly into the cold water overflow after the high temperature process, and then completely drained after the temperature is lowered; Lubricating agent is added to the dyeing bath to reduce the friction between the fabrics and between the fabric and the machine, thereby reducing the chance of wrinkling. However, the selection of the smoothing agent needs to consider the stability, the compatibility with the processing steps, etc., and avoid the lubricant. Improper selection creates other problems; Choosing more advanced machinery, increasing the width of the storage tank and lowering the height of the lifting drum are all beneficial to reduce the pressure on the cloth body. When the air flow cylinder is selected, the fabric is blown open by the high pressure gas at the nozzle, and the fiber is obtained from the tension state. "Resting" is conducive to the elimination of internal stress.  Dry cloth When the fabric is dried and dried, the fabric is dehydrated in a high centrifugal dewatering machine. When the time is too long, it is easy to produce wrinkles that are difficult to eliminate. Many dyeing factories gradually adopt the method of flat-rolling dry cloth, which improves the dry cloth efficiency. It is also conducive to the solution of the crease problem. After rolling, the cylindrical fabric can be stretched by a shock wave machine after being stretched by the guide ring, and the open fabric can be widened by a needle chain.  Stacking method When the cloth is piled up, the weight should not be too large, and the time should not be too long. Especially when the wet cloth is stored, the amount of cloth per vehicle should not exceed 300kg, and the storage should not exceed 6 hours. The problem is that the result of the whole process is not solved by the addition of an auxiliary agent, which is related to the fiber structure, related to the fabric structure, related to the processing technology, and also related to the processing equipment. After the crease occurs, it is generally slightly folded. The mark can be solved by the setting and widening of the setting machine, the stubborn returnable cylinder wash water, gradually warming up to 85 ° C, the process test is gradually cooled down to 50 ° C, or can be re-steamed in the industrial drier. Stereotypes, dyeing plants can be repaired according to their equipment and creases. Source: Printing and dyeing learning and communication Our company was established in 1988, the clothing export group, such as Casual Outfits and also Sportswear , has over 6 years of OEM service experience. mens athletic t shirt, sports wear oem odm, knitted activewear supplier Ningbo Ningshing Trading Group Inc. , https://www.apparel-products.com
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Causes and solutions for creases in knitted fabrics