How Does The New Slurry Step On The Green Road?

< p > in the recently held "a href=" http://www.91se91.com/news/index_z.asp "cotton textile new technology application and new product development seminar < /a >, experts at the seminar launched an exchange on PVA free sizing technology.

Experts generally believe that the key to the popularization of PVA free sizing technology is to choose the right new environmental paste.

At present, the domestic technical specifications of new environmental paste have largely met the requirements of replacing PVA.

Many key cotton spinning enterprises in China have also been widely promoted and applied. Some experts give positive comments to them.

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< p > < strong > no PVA is advancing < /strong > /p >

< p > industry experts say cotton spinning and dyeing industry has made great efforts to promote PVA free sizing technology. The current situation is that printing and dyeing enterprises are more active in it.

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< p > this is because no PVA sizing technology can reduce the cost of slurry and improve weaving efficiency, but the effect is not obvious.

For the process of desizing, dyeing and finishing of the back road, the use of PVA slurry directly affects the printing and dyeing effect and sewage discharge.

Many environmental policies also aim directly at printing and dyeing enterprises, resulting in greater pressure on them.

In addition, after several decades of popularization and application, most cotton spinning enterprises have already had a mature PVA sizing process. Therefore, both the technicians and the truck drivers prefer to use PVA slurry to sizing the yarns.

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Li Dezhi, executive deputy general manager of Shandong de Cotton Textile Technology Co., Ltd. believes that there are three advantages of PVA sizing technology without p.

First of all, it is in accordance with the requirements of the post finishing. The desizing of the grey fabric without PVA sizing is easy and the cost is low. The cost of dyeing and finishing of the rear road can be greatly reduced.

The two is to reduce the cost of sewage treatment, especially for COD (chemical oxygen demand) and BOB (biochemical oxygen demand).

Three, it is better able to meet the needs of the market. Now developed countries have set up various trade barriers to developing countries, and some merchants from the United States and Europe have directly proposed the technology without PVA sizing.

Therefore, the company has been actively looking for a new environment-friendly slurry that can replace PVA.

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< p > cotton textile enterprises certainly know the advantages of no PVA < a href= "http://www.91se91.com/news/index_c.asp" > sizing technology < /a >, but they are more concerned about whether the new environmental protection slurry can really replace PVA, so that the sizing process can meet the requirements of the latter.

Lin Yuanjie, chairman of Shanghai Sida Industrial Co., Ltd. thinks that the starch used in sizing before is hard and brittle and has poor ductility. Therefore, PVA must be added to improve the toughness and wear resistance of the film, and at the same time, the pressure of environmental protection of cotton spinning enterprises is not large enough. Some enterprises dare not rush to use PVA sizing technology.

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< p > therefore, no PVA sizing technology should be a joint project promoted by the upstream textile and chemical industry, the middle reaches of the cotton textile industry and the downstream printing and dyeing industry.

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< p > < strong > slurry breakthrough is the key to < /strong > < /p >

< p > in fact, after the vigorous development of the industry and the continuous exploration of enterprises, there is already a new environment-friendly slurry that can replace PVA in a certain extent.

The sizing technology without PVA has also been widely applied in many domestic enterprises, and achieved good results.

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< p > Zhao Zhihua, assistant general manager of Jiangsu Dasheng Group Co., Ltd., believes that there are many kinds of pulp that replace PVA in the market. Generally, corn starch and potato starch are used as raw materials to develop high performance starch with better performance than the original single modified starch through two or more denaturation.

Its adhesive properties, film properties, gel properties and sizing properties are better than the original single modified starch, which provides a material basis for advancing PVA free sizing technology.

However, the properties of these high performance starch are very different. Some high performance starch also contains PVA and other unenvironment-friendly ingredients. Some high performance starch can not reach the full or most of the sizing performance of PVA.

This requires enterprises to seriously analyze and test the performance of each product, and be familiar with the advantages and disadvantages of these products in order to make reasonable use.

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< p > as a pulp production enterprise, Shanghai Sida Industrial Co., Ltd. put forward the proposal that you should join me in making the "water saving envoy".

The CD-DF868 size of the company can be used for sizing 40S, 50S, 60S, 80S, 100S cotton, T/C, T/R, Rayon, Tencel and so on, completely replacing the PVA, thus improving the weaving efficiency and reducing the sizing cost of the cotton spinning enterprises.

At present, the company's new environment-friendly slurry has been extended to the world. Domestic Shandong Lutai, Lufeng textile, Jiangsu Dasheng, Shandong de Mian, Jihua 3542 and other key cotton spinning enterprises and overseas India, Pakistan, Thailand, Vietnam and so on more than 100 enterprises have not used PVA sizing on different products.

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< p > Lin Yuanjie said that the 3542 Chinese company used CD-DF868 slurry instead of the traditional PVA for sizing the pure cotton yarn of 80S (high density and wide width). The cost of the slurry was reduced by more than 15%. The efficiency of the high speed loom was still over 90% on the 480rpm high speed loom, and the high speed air-jet loom efficiency was maintained at over 90% when the slurry cost was reduced by more than 10% for the 100S (high density and wide width) pure cotton yarn.

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< p > now, some places require printing and dyeing enterprises online COD not more than 120 mg / L, and some places require no more than 80 mg / L.

Lin Yuanjie said that the ratio of 5 day biochemical oxygen demand to chemical oxygen demand (BOD5/COD) of completely alcoholysis of PVA was 0.01.

The larger the size of the pulp, the better. More than 0.3 can be considered as an environmentally friendly slurry.

The BOD5/COD of oxidized starch is about 0.4, and the BOD5/COD of CD-DF868 BOD5/COD is about the same as that of oxidized starch.

Therefore, there is no green barrier to export products from the pulp of cedar pulp to Europe or other countries.

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< p > < strong > advantages are more than environmental protection < /strong > < /p >.

< p > Jiangsu Dasheng group uses CD-DF series slurry to promote no PVA sizing. The slurry has changed from PVA to almost no PVA in the past.

The usage of PVA decreased from 52% of the main size to 2.9%. The proportion of PVA used in the whole year was reduced by 94.4%, and PVA slurry was used less than 500 tons per year.

Over the past 5 years, the practice of no PVA sizing has proved that most varieties of yarns can be made without PVA sizing.

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< p > because PVA is not used, sizing yarn is easy to divide yarn, and regenerated hairiness is obviously reduced. The definition of loom openings is obviously improved, and the average efficiency of loom is over 92%. The average efficiency of loom is increased by 4% over the original size of loom with PVA as the main sizing agent, and the annual economic benefit is about 4000000 yuan.

The cost of slurry is reduced by 8%, and the cost of slurry is reduced by about 700000 yuan a year. The use of high pressure sizing has been promoted, the use of steam in cylinder drying has been reduced, the consumption of steam and other energy consumption has been reduced, and the appearance of slurry pulp has been reduced, which has almost eliminated the defects of slurry spots.

Through the treatment of residual slurry cascade and washing tank wastewater, the discharge has met the requirements of local governments for environmental protection.

Products also meet the requirements of printing and dyeing mill to reduce sewage discharge.

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< p > Zhao Zhihua said that the stability of the yarn quality and quality directly affects the advancement of PVA free sizing technology.

In the production process, no PVA sizing is used. In addition to determining the sizing formula, it is necessary to cooperate with the PVA sizing process through strict management to ensure that the sizing equipment has a good running state, operate strictly according to the technological process, and establish a "a href=" http://www.91se91.com/news/ index_s.asp > yarn quality /a > feedback system.

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