Papermaking In The Non
As long Fiber Raw material shortages, people are from all aspects of hard work to
develop new fiber resources, use Paper , Branches wood, hardwood, wood and other low-cost machines grass fiber pulp production of advanced alternative to softwood pulp paper. Therefore, the non- Timber Plant fibers will undoubtedly global pulp and paper industry as an increasingly important role. Facts have proved that: as long as the correct choice of non-wood plant fiber pulping process and the formulation of raw materials, most grades of paper or cardboard can be produced, if circumstances permit, all grades of paper can be in the situation without any pulp made out under the copy. However, in most cases, non-wood plant fiber materials still need to be used in conjunction with a small amount of wood pulp. Mainly because the use of non-wood fiber raw materials will bring papermaking following questions:
(1) wet sheet easily crushing, easy to roll easily stick breakage.
(2) fiber is short, more complex cells, treatment difficult. (3) low copy paper sheets tear. These are not conducive to paper, and in Paper Add Wet Additives Due to significantly improve these problems, but a world wide in recent years a concern. With the continuous development of domestic and foreign chemical additives, paper additives become an increasingly widespread industrial applications. All kinds of cytoplasm sizing, wet and dry enhancer, retention and drainage aids, defoamers, resins control Preparation , Fiber and waste paper deinking agent dispersing agent widely used in papermaking in the paper. Application of these additives to improve the sheet forming conditions, to reduce slurry consumption and energy burden and improve the physical properties of paper sheets, adapted to today's high-speed paper machine, paper light quantitative, species diversity and the machine uses water closed Cycle Of the various requirements. Add a variety of Polymer Make paper reinforced, especially a hot topic of today's paper.
Early mainly starch, vegetable gum and other natural products, after the development of starch derivatives, carboxymethyl cellulose and other semi-synthetic product. As the polymer into the paper industry, based on polyacrylamide and its series of odd and even components of the system came into being. Most of these products by amine or quaternary ammonium salinization methylation modification of the charge with a strong sun better for the fiber absorption. In recent years, retention and drainage into the paper industry issues of common concern, starch, polyacrylamide class except with the enhancement, it can also speed up the paper feed water treatment to make it easy to dry, and may increase the fine fiber and filler keep promoting sizing, reducing a range of issues such as white water pollution. The auxiliaries are often used cationic starch and cationic polyacrylamide.
1 starch Series Starch is a complex and valuable material. The application of starch in paper industry is mainly starch, are used: oxidized starch, cationic starch, anionic starch, phosphate starch and dialdehyde starch. Used in four areas: wet add, layer Spray Surface sizing and Paint Coating . Wet application is its application in the papermaking process is an important part. On wet Additive As such, the use of starch derivatives to minimize its pollution.
Starch derivatives have the following characteristics: keep well and can increase their packing and small fiber retention; as playing the role of precipitating agent and not interfere with a clarification of sewage; non-toxic ; can be highly biodegradable. Ionic starch derivatives are widely used involves strength, retention and treatment of applications discussed here are several common types:
1 1 cationic starch cationic starch have been applied to many varieties of paper, filled mostly white, is due to the strength, retention and treatment effects. These products have a high dispersion (due to the repulsive force of charged substituent effects) and high retention rate (high efficiency and less pollution) benefits. Although the high cost of cation starch modified starch, but not higher than the retention therefore economically viable. In addition, the reduction in paper machine water content of fine fiber and filler, its economic benefits strongly stimulated the application of this product. Cationic starch is also used in other areas. For the alkaline sizing agent, AKD and ASA, together with the cationic starch used, since retention agent Emulsion Stabilizer, Speakman recommended instead of cationic starch or modified starch is not a natural anionic starch particles to improve the wet retention added. Other uses include commonly referred to as Bicomponent Systems, such as cationic starch and polyacrylamide hydrolysis can be obtained using a single polymer than may be achieved in a higher retention level. The opposite charge in order to add polymer electrolyte to the slurry containing the filler to generate flocs, floc Britt such funding, described as "hard flocs", because they have excellent high-shear anti-coagulation effect.
Add other wet polymer compared to cationic starch is a notable characteristic of the high amount of pulp. This is caused by two reasons, one is the addition of cationic starch with high, usually 1% to 2%; the other hand, cationic starch is not 100% retention rate, especially with a lot of impurities in the pulp, accumulated in the wet cycle, many of which starch pulp positive charge has been highly active in the "miscellaneous anions" are in and retain more difficult. However, excessive consumption can cause gradual accumulation of excess cations caused by the system until the reverse charge will be adversely affected.
1 1 1 cationic starch on the production of paper
(1) of the Pulp and dehydration of the role of cationic starch filtration and enhancement are very different, with the enhancement in the amount of starch in the pulp increased, but the only function of filter aids only occur in low dosage, under the high amount of starch but hinder treatment. In practice, when the cationic starch to achieve the best enhancement, its usage is often far beyond the scope of filter aids, and may cause cation system so difficult to machine operation, packing retention rate decreased, the effect will decrease. Cationic starch will increase under the high amount of water-retention value of pulp, which also have an adverse effect on dehydration. This role is very important for cardboard production, as thick cardboard, paper machine speed limit in most cases by the drying capacity, the combination of water, pulp increased, is bound to reduce the drying efficiency of the dryer section. In addition, water retention value of pulp is too high interlayer also adversely affected.
(2) of the paper operations of the Department of cationic starch in papermaking net loss, and then with the white water reuse in the papermaking system. Cation because of enhanced system, charge inversion, particularly in alkaline papermaking in the greater sensitivity of ion charge balance, lead to wet out of control, dysfunctional machine
Papermaking In The Non
By: zzj89@foxmail.com
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