The temperature of the sizing tank must be controlled when sizing wool warp yarns

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Towel fabric is composed of two systems of warp yarns (hair warp and ground warp) and one system of weft yarns. The wool warp-spun yarns and weft yarns form the loops, and the ground warp-spun yarns and weft yarns form the base fabric, which becomes the basis for the fixation of the loops.

There is a large difference in machine tension between the ground warp and wool warp weaving of towel fabrics. The tension endured by the ground warp yarn during the weaving process is generally several times greater than the tension of the towel yarn. There is a common misunderstanding in the industry. It is believed that the sizing of wool warp yarns only needs to achieve clear openings and facilitate weaving. In fact, this is not the case. Because of the special organizational structure and weaving principle of towel fabric, the sizing of ground warp yarn and wool warp yarn is different from that of general woven products.

Compared with ground warp sizing, wool warp sizing is more complicated. Because the characteristics of towels are mainly reflected through wool and warp yarns, there are many issues that need to be considered when determining the sizing rate, including spinning yarn type, yarn count, spinning yarn twist, warp and weft density, pile height, and whether to cut pile , product style, etc.

At present, due to the particularity of woolen warp yarns, its sizing technology is more difficult and there are still some deficiencies. It is impossible to summarize a complete set of technical theories like general woven products, and the industry still needs continuous exploration and summary. Taking the sizing of weakly twisted yarn varieties as an example, we analyze the issues that need to be paid attention to when sizing weakly twisted yarn varieties.

The characteristics of weakly twisted towels are loose and soft and have good water absorption. The difficulty of sizing the weakly twisted yarn towels lies in the low twist and high unevenness of the weakly twisted yarns. The high sizing rate of the weakly twisted yarns will lead to stiffness, hand pricking, unclean cut pile, random hair, reverse hair lifting, stranding, etc. phenomenon, thereby affecting product style. Low sizing rate will also cause problems such as broken threads, twisted threads, pilling, and dirty cut piles. When used, the joints are not strong, the twist is uneven (or even no twist), etc., which can easily cause problems such as sizing roller yarn wrapping.

Spun yarns with the same yarn count and different twists have greatly different sizing rates. For example, 36.4tex65 twist/10cm yarn with low wool and high wool should normally have a sizing rate of 2% to 2.5%, but The sizing rate of the same yarn count 41 twist/10cm needs to be about 4%. Taking 64.8tex pure cotton weakly twisted yarn as the wool warp yarn as an example, the test towel product specifications are that the ground warp yarn is 36.4tex pure cotton yarn, the wool warp yarn is 64.8tex (9S) weakly twisted pure cotton yarn, and the weft yarn is 36.4tex Pure cotton yarn; weft density 45/2.54cm, reed size 60/10cm; wool height 1.2cm.

In view of the characteristics of 64.8tex pure cotton weakly twisted yarn, Vosges Company selected modified starch with strong adhesion to natural fibers and excellent film-forming properties as the main slurry. Since the spinning yarn is very loose, there is no problem with the penetration of the slurry. Focus on the adhesion of the slurry to the fibers of the spinning yarn and the problem of hairiness. As a terry fabric, it must meet the loop flexibility during the manufacturing process. After many tests, the slurry formula was determined to have a sizing volume of 1000L, 8kg of general starch, 20kg of high-quality modified starch, 2kg of wax flakes (sizing oil agent), and 2kg of acrylic acid.

During the sizing process, it was found that the temperature of the sizing tank is too high, which will cause severe yarn breakage in the sizing tank. After the 64.8tex pure cotton weakly twisted yarn is broken in the sizing tank, it is not only easy to get entangled on the sizing roller, And it often sinks to the bottom of the slurry tank and is not easily detected, forming a larger mass and then traveling to the drying area, resulting in breakage or failure to dry. The solution is to lower the temperature of the sizing tank to 75°C~85°C, use single-immersion and single-pressure sizing, humidify and divide the strands and add wax after adding to reduce hairiness, and contact the cotton textile department to strengthen the treatment of yarn breaks during the spinning process. , Reduce the occurrence of bad joints and weak joints.

Sizing is a systematic project, which must be able to serve weaving and final finished products as much as possible. Therefore, pushing quality management work to a standardized and standardized work track can not only ensure smooth production, but also increase the vitality of the enterprise.

　(Deputy Section Chief of the Technical Section of Vosges Group Co., Ltd. Wang Guozhan)

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