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  2. Bleaching of wood pulp - Wikipedia

    en.wikipedia.org/wiki/Bleaching_of_wood_pulp

    Bleaching of wood pulp is the chemical processing of wood pulp to lighten its color and whiten the pulp. The primary product of wood pulp is paper, for which whiteness (similar to, but distinct from brightness) is an important characteristic. [1]

  3. Paper chemicals - Wikipedia

    en.wikipedia.org/wiki/Paper_chemicals

    Chemical pulping involves dissolving lignin in order to extract the cellulose from the wood fiber. The different processes of chemical pulping include the Kraft process, which uses caustic soda and sodium sulfide and is the most common; alternatively, the use of sulfurous acid is known as the sulfite process, the neutral sulfite semichemical is treated as a third process separate from sulfite ...

  4. Bleached Chemi-ThermoMechanical Pulp - Wikipedia

    en.wikipedia.org/wiki/Bleached_Chemi-Thermo...

    Bleached Chemi-ThermoMechanical Pulp (BCTMP) is a pulp product used by the paper industry as a less-expensive alternative for Northern Bleached Softwood Kraft (NBSK).. BCTMP was first produced by Millar Western in 1988 in its Whitecourt Mill, and was initially used in lower grade paper applications. [1]

  5. Kraft process - Wikipedia

    en.wikipedia.org/wiki/Kraft_process

    The kraft process (also known as kraft pulping or sulfate process) is a process for conversion of wood into wood pulp, which consists of almost pure cellulose fibres, the main component of paper. The kraft process involves treatment of wood chips with a hot mixture of water, sodium hydroxide (NaOH), and sodium sulfide (Na 2 S), known as white ...

  6. 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.

  7. Bleach - Wikipedia

    en.wikipedia.org/wiki/Bleach

    Bleach is the generic name for any chemical product that is used industrially or domestically to remove color from (i.e. to whiten) fabric or fiber (in a process called bleaching) or to disinfect after cleaning.

  8. 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.

  9. Solid bleached board - Wikipedia

    en.wikipedia.org/wiki/Solid_bleached_board

    SBB (C2S) construction: 1 - Coating 2 - Bleached chemical pulp 1 - Coating Not drawn to scale. Solid bleached board (SBB) or solid bleached sulphate (SBS) is a virgin fibre grade of paperboard.