Waxing after sizing
In textile mills, post waxing is a sizing process often used, especially when weaving high-grade fabrics, the sizing rate is generally high, and the sizing film is hard and brittle. The post waxing process can not only increase the softness and wear resistance of the slurry film, but also prevent the damage of the slurry structure due to the addition of softener in the slurry
The main purpose of post waxing is to increase the smoothness and antistatic property of sizing yarn, make the yarn with good sizing feel smooth, reduce friction coefficient and falling objects, which is conducive to clear opening, reduce end breakage and improve loom efficiency, which is particularly important for synthetic fiber, high count and high-density pure cotton fabric and shuttleless loom.
Properly increasing the amount of wax can reduce the friction coefficient between sizing and machine parts, which is generally 0.1% ～ 0.3%. If it is too high, it will make the sizing easy to accumulate flying flowers, affect the self-stop function of broken ends and cause weaving defects.
After waxing, it can reduce the accumulation of electrostatic charge on the yarn and is conducive to clear opening. However, it must be noted that during sizing, raw wax shall not be directly added to the wax tank, so as to prevent the unmelted wax block from contaminating the warp with the waxing roller, resulting in excessive waxing and affecting the post-processing coloring of the fabric.
According to the relevant literature, the distribution of wax on the sizing yarn is accumulated on the yarn in the form of dots or isolated small pieces, and does not form a complete thin layer.
Hank waxing
During the twisting process, the ends of some fibers extend out of the yarn body to form hairiness. In the later processing process, a large number of hairiness will also be generated at each friction point of the yarn guide channel. It will not only affect the appearance of the yarn and the smoothness of the fabric, but also cause unclear warp opening and fabric defects in the weaving process. In the process of weft unwinding from the bobbin to the mouth of the fabric on the shuttleless loom, it will also increase the yarn guide resistance and cause weft breakage due to the hairiness of the yarn body, The yarn in yarn dyed weaving production needs to go through the process of scouring, bleaching and dyeing, and the cotton wax on the yarn body will also be lost. The hairiness of the yarn body increases in varying degrees, resulting in the decrease of yarn strength. According to the measurement, the strength of combed 1.5tex color yarn is 5% – 25% lower than that of the original yarn, while the strength of dark color series (such as jujube red, dark green, etc.) is about 10% – 25% lower than that of light color series (such as light camel), resulting in the increase of broken ends in the process of winding, warping and weaving. Therefore, in order to reduce the friction coefficient of the friction point between the yarn and the yarn guide channel, To reduce hairiness and maintain yarn elasticity, textured yarn waxing process can be adopted
Twisting and waxing is to wipe solid wax on the yarn body when the colored yarn is stretched, so that part of the wax is attached to the yarn body, which can reduce the friction between the yarns and facilitate the yarn unwinding. At the same time, adding a waxing device before the colored yarn unwinds from the yarn frame and passes through the tension device can also reduce the friction coefficient between the yarn body and the yarn guide path.
The strength of dark yarn is about 25% lower than that of light yarn. In the twisting process, the strength of colored yarn is reduced by about 10%, but the strength of waxed yarn is relatively reduced. The stretch of waxed barrel yarn is higher than that of the original yarn, while the stretch of non waxed barrel yarn is lower than that of the original yarn.
