• Mechanical pulping Wikipedia

    Mechanical pulping is the process in which is separated or defibrated mechanically into pulp for the industry.. The mechanical pulping processes use in the form of logs or chips that are mechanically processes, by grinding stones (from logs) or in refiners (from chips), to separate the s.

  • Deep eutectic solvent delignification to low-energy

    Full Article. Deep Eutectic Solvent Delignification to Low-energy Mechanical Pulp to Produce Papermaking Fibers. Juha Fiskari, a,b, * Rita Ferritsius, a,c Sinke H. Osong, a Anders Persson, b Tomas Höglund, b Peter Immerzeel, a and Magnus Norgren a A novel process based on low-energy mechanical pulp and deep eutectic solvents (DESs) was evaluated with the goal of producing s

  • Delignification an overview ScienceDirect Topics

    Pulp is produced from by either chemical delignification, mechanical separation of the cells (s), or combinations of chemical and mechanical methods. Mechanical pulping methods give much higher yields (80–95% based on the ) than the chemical methods (40–50% yields).

  • mechanical pulp delignification process

    Pulp is produced from by either chemical delignification, mechanical separation of the cells (s), or combinations of chemical and mechanical methods. Mechanical pulping methods give much higher yields (80–95% based on the ) than the chemical methods (40–50% yields).

  • mechanical pulp delignification process gruppozetasrl

    Contrast of Mechanical Pulping And Chemi. On mechanical pulping process the s are separated from each other by mechanical energy applied to the matrix causing the bonds between the s to break gradually and bundles single s and fragments to be released It is the mixture of s and fragments that gives mechanical pulp the favorable printing

  • Mechanical properties of pulp delignified by deep eutectic

    The tear index was lower for the treated pulp because delignification caused a decrease in the degree of polymerization that impacted the mechanical properties of pulp. The stiffness of beaten pulp after DES2 (128 mN), DES3 (126 mN), and DES4 (123 mN) treatment is very similar to initial kraft pulp

  • (PDF) Deep Eutectic Solvent Delignification to Low-energy

    New process to produce delignified pulp based on mechanical pulp as raw material. A simplified and environmentally improved delignification process based on Deep Eutectic Solvents (DESs) for the

  • mechanical pulp delignification process

    Process for the delignification of unbleached chemical pulp. Jul 31, 1984· The invention relates to a process for the delignification of unbleached chemical pulp, comprising the following stages: (a) oxidation of the unbleached pulp with a peroxide, in an alkaline medium with a % ratio of peroxide/pulp with respect to the Kappa index of said pulp which may vary between 0.01 and 0.1 and a pH

  • Mechanical Pulping an overview ScienceDirect Topics

    Mechanical pulping is the original form of pulping. It has been largely replaced by chemical pulping, is still used for lower grade s such as newsprint, and is the only process used for recycled (Casey, 1983a).Mechanical pulping relies more so on mechanical actions to separate and develop s, rather than using chemical means.

  • Comparison of Chemical Pulping and Mechanical Pulping

    The pulping process is an important link in the making industry. To learn why it is important, we have to start from the pulp. Pulp can be classified mainly into two types by the pulping methods: chemical pulp and mechanical pulp. The chemical pulp is produced through the chemical pulping process, while the mechanical pulp is produced through mechanical pulping.

  • Bleaching of pulp Wikipedia

    Chemical pulps, such as those from the kraft process or sulfite pulping, contain much less lignin than mechanical pulps, (<5% compared to approximately 40%). The goal in bleaching chemical pulps is to remove essentially all of the residual lignin, hence the process is often referred to as delignification.

  • Deep Eutectic Solvent Delignification to Low-energy

    Deep Eutectic Solvent Delignification to Low-energy Mechanical Pulp to Produce Papermaking Fibers. A novel process based on low-energy mechanical pulp and deep eutectic solvents (DESs) was evaluated with the goal of producing s suitable for making. Ideally, these s could be produced at much lower costs, especially when applied to

  • WO1994012721A1 Process for delignification of

    The present invention relates to a process for delignifying and bleaching lignocellulose-containing pulp, in which the pulp is delignified with a peracid or a salt thereof, treated with a complexing agent, and subsequently bleached with a chlorine-free bleaching agent. Suitably, delignification is carried out with the strongly oxidising peracetic acid, giving a considerable increase in

  • WO2002088460A1 Methods to enhance pulp bleaching and

    A method to enhance brightness in Chemical and Mechanical pulps comprising adding an organic sulfide chelant is described and claimed. A method to enhance delignification in a Chemical pulp comprising adding an organic sulfide chelant is also described and claimed.

  • mechanical pulp delignification process

    Process for the delignification of unbleached chemical pulp. Jul 31, 1984· The invention relates to a process for the delignification of unbleached chemical pulp, comprising the following stages: (a) oxidation of the unbleached pulp with a peroxide, in an alkaline medium with a % ratio of peroxide/pulp with respect to the Kappa index of said pulp which may vary between 0.01 and 0.1 and a pH

  • Effect of light-delignification on mechanical, hydrophobic

    Jan 17, 2018· To improve the mechanical, hydrophobic and other properties of HMFM, HMFM before and after the light-delignification treatment were prepared via hot-pressing molding process.

  • A method for integrated optimization of chlorine dioxide

    "A method for integrated optimization of chlorine dioxide delignification of bagasse pulp," BioRes. 13(1), 1065-1074. Abstract. Chlorine dioxide bleaching is an important component of elemental chlorine-free bleaching. A method is introduced in this to optimize process conditions for chlorine dioxide delignification based on nonlinear

  • Comparison of Chemical Pulping and Mechanical Pulping

    The pulping process is an important link in the making industry. To learn why it is important, we have to start from the pulp. Pulp can be classified mainly into two types by the pulping methods: chemical pulp and mechanical pulp. The chemical pulp is produced through the chemical pulping process, while the mechanical pulp is produced through mechanical pulping.

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  • Pulp Bleaching Technology Princeton University

    pulp is produced by the kraft process (about 88 percent of the pulp bleached in 1987 was kraft pulp). Very little mechanical pulp has been bleached in the past, however, this is currently changing. Mechani-cal pulp bleaching is growing at more than tw the rate of chemical pulp bleaching worldwide and it is

  • Properties of Pulp (Papermaking Pulp)

    As we move from full mechanical to full chemical pulping process, strength of pulp and bleachability improves. Strength improves due to less degradation of s and bleachability as more lignin is removed in chemical than mechanical pulping processes. Yield: Pulp yield is mainly govern by the pulping process. Mechanical pulping processes

  • (PDF) Enhancing enzyme-mediated hydrolysis of mechanical

    The influence of deacetylation and delignification were further enhanced when NaOH was supplemented with 3% Na2SO3, resulting in 100% deacetylation, 34% delignification

  • Fungal delignification and biomechanical pulping of

    Biopulping, defined as the treatment of chips with lignin-degrading fungi prior to pulping, saves substantial amount of electrical energy during mechanical pulping, results in stronger , and lowers the environmental impact of pulping. Optical properties are diminished; however, brightness can be restored readily with peroxide bleaching.

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  • Fact sheet Pulp bleaching storaenso

    Pulp bleaching. is t he process where pulp fibres are chemically treated before -making to remove lignin and resins. Pulp bleaching results in white and clean products. Totally chlorine free (TCF) bleaching technique uses oxygen delignification in combination with hydrogen peroxide or ozone as the mainbleaching agents.

  • Pulp and Paper Manufacturing Process in the industry

    Refiner pulp and thermo-mechanical pulp are produced by chips. These chips are ground by passing them through rapidly rotating in both processes. In the second stage after refining, the pulp is screened, cleaned, and most of the process water is removed in preparation for making.