Guide Paper Chemistry

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The recently developed process for the removal of all lignins is being used at this time primarily to manufacture boards and storage containers used in archives, in conservation, and in museum-style framing.

Another major consideration in paper is its pH. A very small number of water molecules, HOH, occasionally break up and reform. During the breakup, a positively charged H ion and a negatively charged OH ion are formed. The Hs are acidic and the OHs are alkaline.

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Water has been assigned a pH value of 7, which represents equal concentrations of acid and alkali. If the concentration of H ions becomes greater than the number of OH ions, then the result is said to be acidic, and a lower number is assigned. A pH of 6, for example, is ten times more acidic than water, and a pH of 5 is ten times more acidic than 6, or one hundred times more acidic than water.

If the concentration of H ions becomes less than the concentration OH ions, the result is said to be alkaline and is assigned a higher number, such as 8, which is ten times less acidic than water or ten times more alkaline than water. The scale ranges from 1 to The more acidic a paper, the faster the cellulose will break down, resulting in a shorter lifespan.

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A number of factors can influence the pH of a paper. Residual acids from processing, rosin or alum sizing, fillers used to create bulk, oils used to make paper transparent, optical brighteners, atmospheric sulfur dioxide, and the presence of lignins can all result in a pH of 4. Recent study has shown that even the purest cotton papers will become slightly acidic, even though they left the mill at pH ranging between 6. Chemistry portal. In Lahre, Thomas ed.

Environmental Protection Agency. Retrieved 7 September Washington, D. October Institute of Quimica : 1— Tappi J. January CS1 maint: uses authors parameter link.

China clay Fiber crop Paper chemicals Papyrus Wood pulp. Authority control NDL : Categories : Papermaking Chemical processes Cellulose Pulp and paper industry. Hidden categories: CS1 maint: uses authors parameter Use dmy dates from September Wikipedia introduction cleanup from September All pages needing cleanup Articles covered by WikiProject Wikify from September All articles covered by WikiProject Wikify Articles needing additional references from September All articles needing additional references Articles with multiple maintenance issues Wikipedia articles with NDL identifiers.

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By using this site, you agree to the Terms of Use and Privacy Policy. Diethylene Triamine Penta Acetate. Formamidine Sulphuric Acid or Thiourea Dioxide. Gypsum or Mineral White or Plaster. Hydrogen Peroxide. Calcium Carbonate. Magnesium bisulfite.

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Magnesium Carbonate. Calcium Hydroxide.

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Magnesium Hydroxide. Abietic Acid. Makeup chemical in sulfate pulping chemical recovery Na 2 SO 4. Sodium Carbonate. An acid type cooking liquor chemical component sometimes used to neutralized residual chlorine in the pulp during the bleaching process. Sodium Hydrosulfite.

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