Green Way Without PVA Sizing

In order to further promote the process of sizing without PVA, enterprises are concentrating on the selection of slurry. After application and practice, sizing performance of modified starch slurry is continuously improving. However, due to the fluctuation of yarn quality and instability of pulp quality and improper application, the expansion of green sizing works is hindered. For this reason, the quality of raw yarn is required to be stable. Following the principle of "similarity compatibility", we should select slurry size, advocate simplifying the matching components of slurry, and emphasize the optimization of sizing process, thus becoming the best way to promote green sizing without PVA.

In 2010, Jiangsu new salt spinning group accumulated. Green sizing The experience of green sizing on pure cotton combed C14.6tex * C14.6tex and 167 anti - rust cloth is discussed. The sizing of PVA without PVA is realized by sizing, optimizing slurry matching and adjusting the sizing process according to the yarn quality.

In practice, new salt spinning researchers have realized that textile sizing completely replace PVA slurry is a systematic project which requires the attention and assistance of the whole society. To speed up the development of green sizing, energy saving and emission reduction projects, improve the quality of raw yarn, familiarity with the properties of modified starch slurry, and enhance the sizing performance are the key. In addition to the influence of the original yarn and size on the sizing performance, the width of the press roll is reduced. Weaving environment temperature The humidity, the value of lathe operation technology and other factors have an effect on the sizing performance.

Sizing agent

It is the base of sizing effect.

There are differences in performance between various modified starch sizes, and this difference affects the wetting speed and film forming performance of the fibers. Therefore, only by following the principle of "similar compatibility" and "green environmental protection" of fiber and pulp, can we study the strength of the adhesive to the fiber. Only by familiarity with the properties of the slurry can we control the proportion of immersion and coating. Only by matching the quality and quality of the yarn can we ensure the stability of the sizing effect.

In addition, simplification of slurry matching components is the precondition for improving sizing performance. The slurry can match many components, though it can satisfy. Yarn sizing However, it is not clear which slurry in the slurry is conducive to the improvement of sizing performance, and which slurry hinders the performance of other sizing agents. Moreover, it is easy to overfill the warp yarn, causing unnecessary waste and increasing the complexity of the sizing process. Therefore, a simplified component optimization matching method is adopted to match the slurry so that the main sizing agent can show the advantages and disadvantages in performance through sizing application, which not only contributes to the performance of slurry, but also improves the sizing performance.

Yarn quality

Affecting sizing without PVA

At present, some textile enterprises have adjusted the raw cotton matching and spinning process in order to reduce the cost, so that the quality index of the original yarn presents an unstable trend. Especially the single yarn strength and the evenness of yarn evenness will directly affect the progress of green sizing engineering without PVA.

In order to ensure the sizing performance of warp yarn is stable, the yarn strength and evenness are not only required to strictly control the yarn tension in the production process, but also need sizing process to increase the sizing rate, and make up for the yarn's reinforcement and wear resistance and hairiness. More importantly, it is necessary to improve the matching quality of the slurry and maintain the weaving quality of the yarn with the performance of the film, so as to improve the weaving efficiency. However, the most convenient, quick and reliable way to improve the quality of pulp matching is to increase the proportion of PVA slurry in the slurry. Therefore, to achieve sizing without PVA, improving yarn quality is the most important condition.

Control of yarn elongation is the key.

After grafting starch to replace PVA, the film formed on warp is still hard and brittle, especially the fracture elongation of the film is worse than that of the PVA film. If the elongation of the sizing is not controlled by the quality of the original yarn, it will affect the stability of the sizing performance and even destroy the performance of the film. In order to control the elongation of different raw yarn quality by on-line detection, it is an effective way to find out the sizing performance of different modified starch with new thinking.

Reasonable control of moisture regain of sizing yarn

When the grafted starch is used as a substitute for PVA sizing, the starch is the main form of starch matching. In order to make the film pliable and elastic, it is necessary to control the moisture regain of the sizing yarn according to the temperature and humidity of the weaving environment and the fiber characteristics, so as to avoid the hardening and crispness of the film and affect the production efficiency of the loom.

Because the viscosity of the grafted starch is low, the wetting speed of the fiber is obviously accelerated. This will increase the heat shrinkage of the wet sizing yarn when the dryer is drying. If the moisture regain of the sizing agent is not controlled, it is easy to form the adhesive failure at the junction of the film and the fiber and affect the integrity of the film. In addition, the humidity of the membrane will change with the change of ambient temperature and humidity. Therefore, the hygroscopic rate of the film will change with the change of weaving temperature and humidity. To control the sizing moisture regain, the steam pressure can be controlled and the surface temperature of the dryer can be stabilized.