Measures to reduce fabric shrinkage
1. Completely reduce the tension during the refining and bleaching process. 2. During the dyeing and finishing process, when drying wet cloth, loosen the tension as much as possible to reduce the elongation and avoid excessive narrowing of the width. If it is an open-width continuous drying machine, a small capacity cloth must be installed after the width is opened. The box is then inserted into the fabric frame to avoid excessive tension between the opening and the water squeeze. 3. During the yarn finishing process, the expansion tension must be grasped, the effective width of the natural cotton fabric must be maintained, and the weft tension must be controlled. 4. Flat washing machine guide rollers for each process. Rolling rollers and drying cylinders should be maintained flat and clean. To avoid wrinkling when the tension is relaxed, the guide rollers in the water tank must operate freely. The linear speed difference between the front and rear rollers and drying cylinders of the same machine should not be too large. The meridional tension should be controlled so that the cloth does not drag the floor. During the segmentation process of the long table, There is a tension adjustment opening and lowering device or a segmented transmission adjustment device to control the tension. 5. The finished product should strictly control the tension during the subsequent finishing process. Because the warp shrinkage rate after stretching after the yarn is finished, the effective width index of the semi-finished product can be formulated in each process in each machine. The cloth removal process is based on measurement and assessment, and the post-processing process must be inspected to ensure the effective width of the semi-finished product. 6. For some mechanical leisure tensions, manual tension control is required. Strict process operations, strengthen process operations, and strengthen mechanical cleaning to reduce operating tension can effectively reduce the shrinkage of fabrics. 7. Strengthen the inspection of yarn integrity processing process conditions, if possible The dyeing factory can use straight rollers and cloth clips to complete the yarn. 8. Varieties with large warp shrinkage: such as khaki and gabardine poplin fabrics need to be preshrunk to reduce shrinkage. In these varieties, only tight finishing is required. By mechanically relaxing the tension, a good shrinkage rate is as high as about 4%. This shrinkage rate should be further reduced by pre-shrinking. After the product is pre-shrunk, not only the shrinkage rate is reduced, but also a better shrinkage rate can be obtained. The hand feel and texture are clear and soft. 9. For varieties with large weft shrinkage, some of the natural cotton fabrics have unreasonable effective widths. Even if the finishing conditions are reasonable, there will still be a large weft shrinkage. Poor finishing conditions The shrinkage rate is greater, and further improvement measures must be taken. The silk-finished varieties must ensure that the effective width of the drop cloth meets the requirements. In addition, it is necessary to improve the specifications of the natural cotton cloth, without increasing the cost or reducing the cost. The effective width of natural cotton fabric is relaxed to ensure that the weft shrinkage falls within the required range. 10. Resin post-finishing can reduce shrinkage and improve elasticity (pay attention to the feel). PU coating can also reduce shrinkage. 11. For T/C synthetic fiber blended chemical fiber fabrics, it is necessary to grasp the qualitative yarn finishing process and operation to better control the shrinkage rate.
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