In order to further promote the process of sizing without PVA, all companies are focused on the choice of slurry. After application and practice, the sizing performance of modified starch slurry is continuously increasing. However, due to the fluctuation of the original yarn quality, the instability of the pulp quality, and the improper application, the expansion of the green sizing process is hindered. Therefore, the quality of the original yarn is required to be stable, and the slurry is selected according to the principle of “similar compatibilityâ€, the simplified slurry matching component is promoted, and the optimization of the sizing process is emphasized, which becomes the best way to promote the green sizing without PVA.
In 2010, Jiangsu New Salt Spinning Group accumulated experience in green sizing. It discussed the PVA-free green sizing on pure cotton carded C14.6tex×C14.6tex and 167 anti-feather cloths, through selection of slurry, optimization of slurry matching and The PVA-free sizing was achieved by adjusting the sizing process according to the quality of the original yarn.
In practice, new salt spinning researchers realize that textile sizing completely replaces PVA slurry is a systematic project that requires the attention and assistance of the whole society. To speed up the progress of green sizing, energy saving and emission reduction projects, improve the quality of the original yarn, familiarize with the performance of modified starch slurry, and strengthen the research to improve the sizing performance is the key. In addition to the effect of the original yarn and slurry on the sizing performance, the squeezing roller press width, the weaving environment temperature, humidity, value of the lathe operating technology and other factors have an impact on the sizing performance.
The choice of slurry is the basis for the sizing effect. There are differences in the properties of the various modified starch slurries, and this difference affects the wetting speed and the film-forming properties of the fibers. Therefore, only by following the principle of “similar compatibility†between fiber and pulp and green environmental protection, can we study the strength of the adhesiveness of the pulp to the fiber. Only by familiarizing with the properties of the pulp can we control the permeability and the coating. The proportion of the ratio, only according to the quality and quality of the yarn to optimize the matching slurry, in order to ensure the stability of the sizing effect.
In addition, simplifying the slurry matching component is a prerequisite for improving sizing performance. Slurry matching multi-components, although able to meet the sizing requirements of the yarn, but can not tell which kind of slurry in the slurry is conducive to improve the sizing performance, which kind of slurry hinder the performance of other pulp properties. And it is easy to make the sizing of the warp yarns excessive, causing unnecessary waste and increasing the tediousness of the padding process. Therefore, the use of a simplified component-optimized matching method for slurry matching allows the main slurry to exhibit advantages and disadvantages in performance through the application of sizing, which not only contributes to the performance of the slurry but also contributes to the performance of the sizing yarn. improve.
The influence of original yarn quality without PVA sizing At present, some textile companies have adjusted the raw cotton matching and spinning technology in order to reduce the cost, and the quality indicators of the original yarn show an unstable trend. In particular, the excessive strength of single yarn strength and irregularity of the strips directly affects the progress of the PVA-free green sizing project.
In order to stabilize the sizing performance of warp yarns, it is not only necessary for the production process to strictly control the yarn tension, but also the sizing process to increase the sizing rate to reinforce and wear the yarn. The hairy feathers make up for the purpose of reducing the number of stops. What's more important is the need to improve the matching quality of the slurry, and to maintain the weavability of the yarn with the performance of the film to achieve the purpose of improving the weaving efficiency. However, the most convenient, most reliable, and most reliable way to improve the quality of the stock match is to increase the proportion of PVA stock in the stock. Therefore, to achieve PVA-free sizing, improving yarn quality is the primary condition.
The key to control yarn elongation is to replace the PVA sizing with grafted starch. The film formed on the warp yarn still has defects of hardness and brittleness, especially the elongation at break of the film is worse than the elongation at break of the PVA film. If the elongation of the sizing is not controlled according to the quality of the original yarn, it will inevitably affect the stability of the sizing performance and even destroy the performance of the sizing film. For this reason, in the production, the on-line inspection method is used to control the elongation of the different original yarns, and the sizing performance of different modified starches is explored with new thinking. It is an effective method to achieve yarn elongation to meet the performance requirements of the film.
Reasonable control of sizing rewetting rate After grafting starch instead of PVA sizing, since the matching of the slurry is mainly starch, in order to make the film flexible and flexible, the pulp should be controlled according to the changes in the temperature and humidity of the weaving environment and the fiber properties. The resurgence rate of the yarn and the avoidance of hardened and hardened sizing film affect the production efficiency of the loom.
Due to the low viscosity of the starch in the grafted starch, the wetting rate of the fiber is obviously accelerated, which increases the heat shrinkage rate of the wet sizing yarn when the drying cylinder is drying. If the moisture regain of the sizing yarn is not controlled, It is easy to form a bond at the junction of the serosa and the fiber and disrupt the integrity of the film. In addition, the hygroscopicity of the sizing film will change with changes in the ambient temperature and humidity. Therefore, the moisture absorption rate of the film will also change with the temperature and humidity of the weaving environment. To control the sizing regain, it can be achieved by controlling the steam pressure and stabilizing the surface temperature of the drying cylinder.
In 2010, Jiangsu New Salt Spinning Group accumulated experience in green sizing. It discussed the PVA-free green sizing on pure cotton carded C14.6tex×C14.6tex and 167 anti-feather cloths, through selection of slurry, optimization of slurry matching and The PVA-free sizing was achieved by adjusting the sizing process according to the quality of the original yarn.
In practice, new salt spinning researchers realize that textile sizing completely replaces PVA slurry is a systematic project that requires the attention and assistance of the whole society. To speed up the progress of green sizing, energy saving and emission reduction projects, improve the quality of the original yarn, familiarize with the performance of modified starch slurry, and strengthen the research to improve the sizing performance is the key. In addition to the effect of the original yarn and slurry on the sizing performance, the squeezing roller press width, the weaving environment temperature, humidity, value of the lathe operating technology and other factors have an impact on the sizing performance.
The choice of slurry is the basis for the sizing effect. There are differences in the properties of the various modified starch slurries, and this difference affects the wetting speed and the film-forming properties of the fibers. Therefore, only by following the principle of “similar compatibility†between fiber and pulp and green environmental protection, can we study the strength of the adhesiveness of the pulp to the fiber. Only by familiarizing with the properties of the pulp can we control the permeability and the coating. The proportion of the ratio, only according to the quality and quality of the yarn to optimize the matching slurry, in order to ensure the stability of the sizing effect.
In addition, simplifying the slurry matching component is a prerequisite for improving sizing performance. Slurry matching multi-components, although able to meet the sizing requirements of the yarn, but can not tell which kind of slurry in the slurry is conducive to improve the sizing performance, which kind of slurry hinder the performance of other pulp properties. And it is easy to make the sizing of the warp yarns excessive, causing unnecessary waste and increasing the tediousness of the padding process. Therefore, the use of a simplified component-optimized matching method for slurry matching allows the main slurry to exhibit advantages and disadvantages in performance through the application of sizing, which not only contributes to the performance of the slurry but also contributes to the performance of the sizing yarn. improve.
The influence of original yarn quality without PVA sizing At present, some textile companies have adjusted the raw cotton matching and spinning technology in order to reduce the cost, and the quality indicators of the original yarn show an unstable trend. In particular, the excessive strength of single yarn strength and irregularity of the strips directly affects the progress of the PVA-free green sizing project.
In order to stabilize the sizing performance of warp yarns, it is not only necessary for the production process to strictly control the yarn tension, but also the sizing process to increase the sizing rate to reinforce and wear the yarn. The hairy feathers make up for the purpose of reducing the number of stops. What's more important is the need to improve the matching quality of the slurry, and to maintain the weavability of the yarn with the performance of the film to achieve the purpose of improving the weaving efficiency. However, the most convenient, most reliable, and most reliable way to improve the quality of the stock match is to increase the proportion of PVA stock in the stock. Therefore, to achieve PVA-free sizing, improving yarn quality is the primary condition.
The key to control yarn elongation is to replace the PVA sizing with grafted starch. The film formed on the warp yarn still has defects of hardness and brittleness, especially the elongation at break of the film is worse than the elongation at break of the PVA film. If the elongation of the sizing is not controlled according to the quality of the original yarn, it will inevitably affect the stability of the sizing performance and even destroy the performance of the sizing film. For this reason, in the production, the on-line inspection method is used to control the elongation of the different original yarns, and the sizing performance of different modified starches is explored with new thinking. It is an effective method to achieve yarn elongation to meet the performance requirements of the film.
Reasonable control of sizing rewetting rate After grafting starch instead of PVA sizing, since the matching of the slurry is mainly starch, in order to make the film flexible and flexible, the pulp should be controlled according to the changes in the temperature and humidity of the weaving environment and the fiber properties. The resurgence rate of the yarn and the avoidance of hardened and hardened sizing film affect the production efficiency of the loom.
Due to the low viscosity of the starch in the grafted starch, the wetting rate of the fiber is obviously accelerated, which increases the heat shrinkage rate of the wet sizing yarn when the drying cylinder is drying. If the moisture regain of the sizing yarn is not controlled, It is easy to form a bond at the junction of the serosa and the fiber and disrupt the integrity of the film. In addition, the hygroscopicity of the sizing film will change with changes in the ambient temperature and humidity. Therefore, the moisture absorption rate of the film will also change with the temperature and humidity of the weaving environment. To control the sizing regain, it can be achieved by controlling the steam pressure and stabilizing the surface temperature of the drying cylinder.
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