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That is done to make the paper whiter.
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∙ 10y ago
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Why is limestone needed for paper making?
It makes he paper white by bleaching it! :D
Why is sulfur dioxide needed in paper making?
bleaching agent
Is magnesium sulfate heptahydrate used for bleaching material?
Magnesium sulfate is used for bleaching in the paper industry.
Process of making paper?
Paper can be made as a primary raw material wood,bagasse (sugarcane waste). Wood is supposed to cook in a pressure vessel called DIGESTER.Then it is subjected to > cleaning screening brown stock washing bleaching storage paper machine PAPER
Why do paper mills smell bad?
chemicals they use in the process of turning pulp into paper, also some of the bleaching process
What is dioxin used for?
bleaching wood pulp for toilet paper and similar products like a that.
What does paper contain?
The ingredients of paper are cellulose fiber (e.g. wood pulp, linen rags), water, bleaching agent, fillers (e.g. chalk), "sizing" (e.g. clay surface coating for glossiness and ink absorbency). The paper is spread on fine mesh wire screens, pressed between rollers to squeeze out excess water, and allowed to dry to remove the remaining water. Some paper also contains acids (usually from processing to make wood pulp) and if these are not neutralized the paper will turn brown and become brittle over time. The bleaching agent makes the paper white and decolorizes inks from recycled paper.
What happens to red litmus paper if dipped in water?
A bleaching agent turns litmus paper white. For example, chlorine gas turns damp blue litmus paper red, and then bleaches, making it white.
How can white paper appear PINK?
usually from the light in which they are set in, or the bright white light is making a spectrum :)
Is making paper from wood a chemical or physical change?
Papermaking is not one single unit operation but a series of operations some of them such as pulping and bleaching etc. are chemical change while sheet formation, pressing, drying etc. are physical change.
What are the uses of enzymes in the pulp and paper manufacturing process?
Alpha Amylases are the oldest use of enzymes for pulp and paper and are used to "cook" or modify the starch so it can be used to size the paper. The replace a traditional high temperature cook. Xylanases are commonly used to help improve the bleaching of brown Kraft cooked pulp allowing for reductions of 10 to 25 percent ClO2 bleaching chemicals. Cellulases are used in the deinking of wastepaper improving the brightness and reducing the dirt specs. And, they are used to help improve the refinability of pulps in the stock preparation prior to paper making which results in energy and steam drying reductions.
How do people turn leaves into paper?
Paper is usually made from plants that have longer fibers than leaves. However, leaves can be incorporated into the paper making process by adding them to the slurry, or by laying them on top of pulp before it dries.
