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  2. Bleaching of wood pulp - Wikipedia

    en.wikipedia.org/wiki/Bleaching_of_wood_pulp

    The table shows how the two systems rate high-brightness papers, but there is no simple way to convert between the two systems because the test methods are so different. [4] The ISO rating is higher and can be over 100. This is because contemporary white paper incorporates fluorescent whitening agents (FWA). Because the ISO standard only ...

  3. Elemental chlorine free - Wikipedia

    en.wikipedia.org/wiki/Elemental_chlorine_free

    Elemental chlorine free (ECF) is a technique that uses chlorine dioxide for the bleaching of wood pulp.It does not use elemental chlorine gas during the bleaching process and prevents the formation of dioxins and dioxin-like compounds, carcinogens.

  4. Deinking - Wikipedia

    en.wikipedia.org/wiki/Deinking

    Recycling of used paper before the industrialisation of paper production, rag paper was recycled to make low-grade board. A process for removing printing inks from recycled paper was invented by German jurist Justus Claproth in 1774. [2] He practiced together with German paper producer Johann Engelhard Schmid. Today this method is called deinking.

  5. Conservation and restoration of wooden furniture - Wikipedia

    en.wikipedia.org/wiki/Conservation_and...

    The finish of furniture can be painted or transparent. [1] Furniture has existed throughout all the years of human existence. Furniture that is very dated or is an antique can be conserved or restored so that future generations may also enjoy them for cultural, educational and personal benefit. There are many organizations and guidebooks that ...

  6. Tetraacetylethylenediamine - Wikipedia

    en.wikipedia.org/wiki/Tetraacetylethylenediamine

    Active oxygen bleaching agents include sodium perborate, sodium percarbonate, sodium perphosphate, sodium persulfate, and urea peroxide. These compounds release hydrogen peroxide during the wash cycle, but the release of hydrogen peroxide is low when these compounds are used in temperatures below 45 °C (113 °F).

  7. Paper chemicals - Wikipedia

    en.wikipedia.org/wiki/Paper_chemicals

    Paper chemicals designate a group of chemicals that are used for paper manufacturing, or modify the properties of paper. These chemicals can be used to alter the paper in many ways, including changing its color and brightness, or by increasing its strength and resistance to water. [1] The chemicals can be defined on basis of their usage in the ...

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  9. Kappa number - Wikipedia

    en.wikipedia.org/wiki/Kappa_number

    The Kappa number estimates the amount of chemicals required during bleaching of wood pulp to obtain a pulp with a given degree of whiteness. Since the amount of bleach needed is related to the lignin content of the pulp, the Kappa number can be used to monitor the effectiveness of the lignin-extraction phase of the pulping process.

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