In Recent Years, The Technological Progress Of China Paper Industry - Paper, Paper Industry - Paper

In recent years, China's paper industry, including the potential to attract international

capital markets, including a lot of money, the paper industry there is a unprecedented technological transformation and progress to a climax. Coastal Guangdong, Fujian, Zhejiang, Jiangsu, Shandong, Guangxi provinces (districts) of the paper industry by leaps and bounds in some areas to achieve a large industrial transition. 2001, China's paper industry production reached 32,000,000 tons, consumption reached 36.83 million tons, becoming the second largest country in the world paper. In recent years, China's paper industry imported international advanced technology and equipment, advanced production technologies such capacity accounts for 20% of the industry. Of course, the technological level of the whole industry is still relatively low, currently being modernized.

Long network Cardboard Forming Technology Traditional production methods for multi-cardboard cylinder formers, rotary forming cage rotation by the impact of multi-fiber arrangement for the vertical. In the manufacturing Carton Because by the time the direction of drum, made of cardboard boxes piled up, the pressures on the horizontal direction happens to cardboard, is the weak point strength. 70 20th century, the producer's board has recognized that to improve the board's ability to reduce the board to be vertical and horizontal intensity difference, fundamentally overcome this shortcoming must be formed into long orb web shape. Yantai Fu Sida Paper Company first introduced a network of three long-forming technology, has been more than 20 domestic paper-making enterprises to introduce this technology. At present, the domestic paper making machinery plant has self-developed the technology, has nearly 10 paper companies or the transformation of the old machine supplier.

Dry paper technology Dry paper and wet paper The difference is that dry paper is the use of air instead of water to disperse fibers, transmission fiber and forming the sheet. With the development, some special properties of the paper more widely used, dosage is also growing, such as wet Tissue , Napkin, towel, baby diapers, incontinence pads and sanitary napkins; some medical paper, such as disposable surgical clothing, face masks, disposable bed sheets, etc.; also some industrial products such as insulation materials, synthetic leather, fabric and so on. Performance of these products has been difficult to meet the wet paper, in 1995 China introduced a one laminating dry Paper Machinery , Also known as air-laid paper, shortly after production started to melt dry paper, and has been successful. The so-called hot-melt is the use of dry paper pulp 80%, 20% hot melt fibers Pulp Stack smashing shop by shape, after a hot system, hot melt fiber surface melting, the hair fibers stick together and become a sheet. This heat combined with the loose thickness of paper is good, bulky good, high elongation, wet strength, high flexibility and other advantages, better than the glued paper (using spray adhesive to hair fibers bonded together). Current dry paper, and is also is still development stage. China now has the technology, products have been commercialized, used in hygiene products, medical supplies and industrial and other fields.

APMP pulping technology Traditional pulp in two ways: First, chemical pulping, the yield is only about 50%, for the production of high-grade cultural paper or technical paper; Second, Mechanical Pulping, was close to 100%, with to produce Newsprint , Magazine paper and so on. With the advance of time, for full use of plant fiber to consider, people combine these two methods, the production of chemical mechanical pulp. 60 years beginning from the 20th century has been continuous research, after TMP (Thermomechanical Pulp), CTMP (Chemical Thermo Mechanical Pulp), BCTMP (bleached chemical thermal mechanical pulp), until the 20th century, only 90 appeared APMP (alkaline of hydrogen peroxide mechanical pulping) phase. APMP is the use of caustic soda, H2O2, EDTA, MgSO4 and Na2SiO3 prepreg of chemicals such as wood chips, ground into pulp at atmospheric pressure, brightness up to 60%, with a copy by hand-made offset newsprint or magazine paper. To further enhance the whiteness, making more advanced culture of copying paper, also impregnated by the second or third prepreg. This method was as high as 90%, but not achieve the recovery of chemicals, pulp and waste treated, can reach the discharge standards. Yalu River paper mill, Yueyang paper mill, paper mills, etc. have been imported technology Yibin, but can only copy made of newsprint, can whiteness 60%, so only a prepreg, higher whiteness APMP production technology still needs further research.

Paper Deinking

Traditional deinking technology currently can not meet the need. Traditional deinking technology uses alkaline chemicals, surfactants, wetting peeling off the ink. The ink is now more complex, such as UV solid ink, laser solid ink, water-based ink, electrostatic printing inks, gloss paint. The curing ink by alkali chemicals or surfactants can not remove the. Approach is now more mature pieces of paper in the traditional solution, cleaning, screening, bleaching, washing, the first flotation deinking, the further increase of a process, high concentration (eg 30%), high temperature twist ink rubbing dispersed particles to break to pieces as small particles, and then removed through flotation. This method can achieve satisfactory results. Guangzhou Paper Mill, Nanping paper mill, paper mill shixian JUNIOR such as the production scale mills are larger, some achieve deinking 500t / d, the introduction of the deinking process has a high concentration of heat in decentralized rubbing and secondary flotation process. Most of these problems have been resolved, but not solve the problem of aniline removal of water-based ink, deinking pulp brightness effect. A useful way to re-unite overseas, will gather for the aniline ink particles to remove large particles attempt.

by: gaga

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