Ye Xia: Environmental Protection Sizing Is A Systematic Project.

Chief engineer of Luoyang white horse Refco Group Ltd Ye Xia It is believed that popularization of PVA free sizing can bring a lot of benefits to enterprises. The first is to reduce the EIA investment. No PVA sizing can reduce COD emissions and protect the environment. This is both the responsibility of enterprises and the necessary condition for the development of enterprises. In the process of relocation and transformation of enterprises and back to the city, environmental assessment must be qualified to start construction. PVA can not meet the requirements of sizing and discharging. Enterprises can not pass environmental assessment, and no PVA sizing can solve this problem.

Second is the improvement of basic management level and the improvement of enterprise quality. No PVA sizing is more difficult to control than the sizing quality of PVA in practical application. The risk of sizing fluctuation is great. It requires fine management of various technical links, operation and execution in place, scientific selection of slurry size, meticulous slurry inspection and reasonable formulation design. With these conditions, the quality fluctuation without PVA sizing will be effectively controlled.

Thirdly, the products cater to the needs of printing and dyeing enterprises and enhance the competitiveness of enterprises. The effect of sizing without PVA on printing and dyeing process is mainly that desizing is easier, and a relatively simple desizing process can be adopted. The desizing cost is low and the residue is few. The finished products of grey fabric are superior to PVA sizing in terms of color, whiteness, color fastness, functionality and durability, and the desizing wastewater has no pollution. Most printing and dyeing enterprises have recognized the advantages of PVA free sizing cloth.

According to yxia analysis, the sizing rate of PVA sizing still has room to be reduced. With the progress of textile technology, the quality of raw yarn has been greatly improved, and the precise control of weaving equipment is more conducive to the realization of no PVA sizing. The rapid development of slurry production technology provides the possibility of completely no PVA sizing.

At the same time, ye Xia also pointed out that there is no PVA Sizing is also facing some unfavorable factors. Due to the fact that the sizing efficiency of PVA is not directly effective, the trial and test cycle is long and the risk is high. Some enterprises leaders do not know the importance of sizing without PVA, and their enthusiasm for promotion is not high. In addition, the performance evaluation system of some textile enterprises pursues only to reduce the cost of using pulp. It often ignores the influence of loom efficiency, variety difficulty and sales growth on the competitiveness of enterprises. It stifle the enthusiasm of engineers for the exploration without PVA sizing.

Ye Xia said that warp sizing is a systematic project. The quality of sizing is affected by yarn quality, sizing agent, sizing formula, equipment condition, steam quality and operation method.

In order to achieve sizing without PVA, the most important thing is to control the quality of the original yarn, and the quality of the original yarn is the foundation of sizing. When purchasing the yarn, we should choose the perfect management system, the quality level to stabilize the manufacturer's products, put forward specific requirements for packing and transportation, and strictly inspect it. For self spun yarn, we should establish a quality control system aimed at reducing the weak ring and maintaining consistency. We use the electronic clearer of the automatic winding machine to effectively control the quality of the original yarn and feedback the quality information.

　　 size The rational formulation is the key to success. At present, there are many sizes available on the market, with great differences in quality and function. We should carefully select according to the variety, target efficiency level and affordable cost of the company.

Fine management and reducing the fluctuation of sizing rate are the guarantee for successful sizing without PVA. In normal production, due to the interaction of various factors, the fluctuation of sizing rate is generally less than 2%. But if there are several factors superimposed, there will be more than 6% difference in sizing rate. Therefore, it is very important to control several main indexes such as longitudinal sizing rate and transverse sizing rate. To reduce longitudinal fluctuation of sizing rate, it is necessary to ensure that the warping brake is sensitive, and the solids content of the slurry is controlled within the normal fluctuation range of the technological standard of + 1%, effectively filtering the condensed water entering the slurry tank steam, reducing the influence of the moisture content of the steam on the solid content of the slurry, and ensuring the normal function of the automatic pulp feeding device. The "speed pressure grouting" curve is optimized to reduce the fluctuation of the sizing rate due to the change of vehicle speed. Ensure the use state of moisture separator. To reduce the fluctuation of transverse sizing rate, the cylinder state of the press roller must be checked. The difference of the sizing rate between the upper and lower yarns is controlled within 1%, and the difference between the upper and lower layers of the left, middle and right sizing rates is controlled within 2%.

Ye Xia believes that the understanding of warp sizing system engineering should be changed from the study of sizing agents and formulations to the emphasis on the key details of the whole process. The key details can be quantified and effectively controlled by digital quantification. It will not only make the work without PVA sizing easier, but also reduce the sizing rate on the basis of no PVA sizing, and effectively control the cost of slurry.