Principles of sizing technology
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When formulating the sizing process, it is necessary to ensure that the sizing process meets the weaving requirements of the sizing variety. The focus is on whether the sizing rate is appropriate, whether the elongation is within a reasonable range, whether the moisture regain meets the requirements, whether the hairiness is adherent, and whether the sizing film is Whether it is wear-resistant and other aspects. During production, it is formulated based on various factors such as yarn type, fabric structure, loom weaving speed, and slurry performance.
When formulating the sizing process, due to different spinning raw materials and spinning methods, the focus is on different aspects. The fibers used in open-end spinning are shorter and have lower strength, but the yarn is tighter and has less surface hairiness. Therefore, the focus of sizing should be on controlling sizing and moisture regain. It is difficult to control sizing in air-jet spinning, and fluctuations in solid content have a greater impact on the size of sizing. If it is slightly larger, the sizing will be large, and the sizing yarn will be twisted and broken, and the reed teeth will be hit. It will lead to broken ends; if the solid content is small, it will be light, pilling, and difficult to weave. The solid content of the sizing yarn should be taken as the upper side for the plain weave. Take the middle value for the twill grain, and take the bias for the segment grain. When the vehicle speed is low, take off the bias. The higher the vehicle speed, the higher the bias. The characteristic of ring spinning yarn is that the hairiness is longer and more, especially carded yarn. Therefore, when formulating the process, it is necessary to ensure hairiness and reduce the generation of regenerated hairiness on the premise of ensuring sizing. The main characteristics of compact spinning are less hairiness and high strength. The spun yarn is relatively smooth. Therefore, the main consideration when sizing is sizing and wear resistance. The characteristic of siro spinning is that it has a double-strand style. The yarn has higher strength and less hairiness. You can refer to compact spinning for sizing.
The influence of fabric structure on sizing process. Generally speaking, in terms of sizing rate, plain weave is high and segment weave is low, that is, the number of frictions is more, and the sizing rate is higher. In production, sometimes the sizing formula is adjusted to adjust the wear resistance of the sizing film. It should be noted that some varieties with very close warp and weft densities have larger weft shrinkage, which is still more difficult to actually weave. The sizing quality and sizing rate should be improved to ensure the wear resistance of the sizing film.
The vehicle type and vehicle speed also have different requirements for sizing. Air-jet looms are fast, have high requirements, and have low hairiness requirements. Rapier looms are slow, and the hairiness requirements are not as high as those of air-jet looms. Therefore, the rapier sizing rate can be lower and the sizing can also be different to meet the sizing requirements. That’s it.
Slurry is divided into two categories: main slurry and auxiliary agents. PVA, high-performance starch, and general starch belong to the main slurry, while wax flakes, acrylic, antistatic agents, etc. belong to auxiliary agents. PVA sizing film has good wear resistance, high sizing film strength, less sizing and weaving loss, but the price is higher, the sizing yarn splitting resistance is large, regenerated hairiness is abundant, and defects such as sizing spots are easy to occur. The head is decapitated and there are many heads. Compared with PVA, high-performance starch is lower in price, has less resistance to yarn splitting, less breakage, and less regenerated hairiness in sizing yarns. However, its wear resistance is worse than PVA, and there is more sizing and weaving loss. Generally, starch is actually dry oxidized starch. The oxidation reaction occurs in the mixing barrel. Since the mixing of the modifier inside is not as good as that of wet starch, the viscosity fluctuates greatly and the viscosity stability is poor. The advantage is that it is cheap.
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