What is Kraft paper detailed chemical composition?-Iota

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Service > What is Kraft paper detailed chemical composition?

What is Kraft paper detailed chemical composition?

Kraft (kraftpaper), kraft softwood pulp as raw material, beating on Fourdrinier papermaking from. In fact, kraft paper and plain paper manufacturing method is not much different. Why is stronger than ordinary kraft paper it? This is mainly used for kraft wood fibers is relatively long, and when the cooking timber, with caustic soda and sodium sulfide is treated with chemicals so that they play the role of chemical comparative ease, the intensity of the original wood fiber damage suffered relatively small, between so use this pulp made out of paper, fiber and fiber is closely dependent, so kraft are very firmly.
Chemical composition of the raw materials
Plant fibers mainly containing
1, cellulose
Wood contains 40-50% of cellulose. From the perspective of the paper in the pulping process should be strongly trying to keep cellulose to improve the pulp yield and paper strength.
2, in softwood hemicellulose generally contains only about 20%, in order to improve the yield of pulp and paper strength, the pulping process should try to retain some hemicellulose.

3, lignin
In coniferous wood, the lignin content of about 30%. Chemical pulping chemicals is to use the adhesive material between the cells to dissolve part of the fiber separated from each other into a pulp. The more lignin-containing raw material, the more difficult the pulp, which is also the more chemicals to be consumed.
Minor components:
Plant fiber material in addition to containing cellulose, hemicellulose, lignin three main components, there are lesser amounts of other ingredients such as resins, ash and the like. In the commonly used raw material content is not, on paper will not cause much difficulty. However, if the content is too high, there are special requirements for certain paper you must take the appropriate measures to be removed.
1, resins, fats
Generally less raw material content, are less than 1%, but in the case of pine wood content of more, their viscous, easily bonded into a group, such as a sticky in the top wire and the press roller, resulting in difficulties in papermaking, the paper is formed of a transparent resin point, reduce the quality of paper. They are easy to produce alkali and soap, and dissolved in water, so the number of pine resin-containing alkaline pulping generally used, in order to reduce their harm. Fat is generally little risk, can also be saponified dissolution.
2, starch, pectin
Starch for cell storage cavity material, not much content, soluble in water, there is no effect on the pulp and paper. General materials containing pectin much, they break down easily dilute alkali dissolution. In plants the presence of salt in the form of pectin, is considered to be a source of plant ash. Flax and other bast fibers mainly pectin cell media, only a small amount of alkaline cooking can be unglued.
3, tannins, pigments
The general content of not less material damage, they easily out of hot water. But more content when trying to advance out of otherwise make pulp bleaching darker easy.
4, ash
Ash is a plant fiber material in the inorganic salts, mainly potassium, sodium, calcium, magnesium, sulfur, phosphorus, silicon salts. Wood ash are between 0.2% to 1.0%.

Used as packaging material. High strength. Usually was brown. Semi-bleached kraft pulp bleaching or full light brown, cream or white. Quantitative 80 ~ 120g / m2. Breaking length is generally above 6000m. Tear strength, high fracture strength and dynamic power. More for the web, there are flat paper. Used as a cement bag paper, envelope paper, plastic sealed paper loading, asphalt paper, cable protection paper, insulation paper.

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