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Saturday, August 8, 2020 | History

2 edition of Technical development of mechanical and chemimechanical pulping processes found in the catalog.

Technical development of mechanical and chemimechanical pulping processes

Douglas Atack

Technical development of mechanical and chemimechanical pulping processes

by Douglas Atack

  • 134 Want to read
  • 19 Currently reading

Published by Pulp and Paper Research Institue of Canada in Pointe Claire, Quebec .
Written in English

    Subjects:
  • Mechanical pulping process,
  • Pulping

  • Edition Notes

    Caption title

    StatementDouglas Atack
    ContributionsPulp and Paper Research Institute of Canada
    The Physical Object
    Pagination18 leaves ;
    Number of Pages18
    ID Numbers
    Open LibraryOL15493032M

    In this study, mechanical and optical properties of CMP, one stage APMP and two stage APMP pulps (from Tajan wheat straw Golestan province) were investigated. wheat straw collected at research center of Agriculture and Natural resources of Golestan province. Fiber dimensions such as average fiber length, diameter cell, lumen and fiber wall thickness were assessed at mm, , and. Supported earlier ( to ) by NSERC via the NCE Mechanical and Chemimechanical pulp Network, and funded recently ( to present) by an NSERC Strategic Project Grant, we have pursued actively the catalytic [2]-hydrogenation of lignin chromophores such as coniferaldehyde (Scheme 1) as a reductive and "green" bleaching and brightness stabilizing method for mechanical and chemical .

    This unit can be used for continuous production of chemical or semi-chemical pulp, as long as the process permits short retention times and some degree of refining at the discharge. On non-woods, the unit can be made to run like a screw-type digester. The unit has been run successfully on corn stalk, wheat straw, hemp, and kenaf. Mechanical Pulping. The development of chemical pre-treatment and defiberizing equipment has greatly improved the energy-to-quality ratio. ANDRITZ has developed tailor-made processes and technologies for hardwood and softwood mechanical pulping, as well as the pulping of annual fibers.

    Implementing Cleaner Production in the pulp and paper industry The large—and still growing—pulp and paper industry is a capital- and. Our Stores Are Open Book Annex Membership Educators Gift Cards Stores & Events Help Auto Suggestions are available once you type at least 3 letters. Use up arrow (for mozilla firefox browser alt+up arrow) and. Pulp Production 3 ch (3C) Wood and chip requirements; overview of pulping processes; mechanism and variables in mechanical and chemimechanical pulping, general principles of chemical pulping, kraft cooking, sulphite cooking, extended and oxygen delignification, pulp washing, pulp bleaching, recovery of pulping chemicals.


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Technical development of mechanical and chemimechanical pulping processes by Douglas Atack Download PDF EPUB FB2

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

In addition to the chemical or mechanical methods mentioned above, the pulp manufacturing process uses a combination of these two methods to dissociate the fibers from materials and then purify or refine them into raw pulp or bleached pulp.

Chemi-mechanical pulp category. Paper pulp can be classified according to the type of raw material, paper. Mechanical and Chemi-Mechanical Pulping is the sixth of 15 CD-ROMs in the Making Pulp and Paper CD-ROM h this highly interactive, self-paced CD-ROM participants learn mechanical and chemi-mechanical pulping terms, concepts, and processes.

Pulp consists of wood or other lignocellulosic materials that have been broken down physically and/or chemically such that discrete fibers are liberated and can be dispersed in water and reformed into a web.

There are four broad categories of pulping processes: chemical, semichemical, chemimechanical, and mechanical pulping. H.L. Hintz, Sunday A.

Lawal, in Reference Module in Materials Science and Materials Engineering, Sulfite and Solvent Pulping Processes. In sulfite pulping, usually conducted under acid or neutral conditions, sulfur dioxide and/or bisulfite ions react with lignin to produce water-soluble sulfonated lignins that are degraded by acid hydrolysis reactions.

Industrialbackgroundsession Technical development of mechanical and che-\ '•'' " mimechanical pulpingprocesses •"' *"''Pulp andPaper Reseach Institute of Canada Prospects for mechanical pulps in different regions ofthe world R.

Aurell, Jaakko PoyryOy, Finland The production and use of mechanical and chemimechanical pulps 5 E. Bohmer, The Norwegian Pulp and Paper Research.

Full Article. Mixing Bleached White Poplar and Wheat Straw Chemimechanical Pulps to Improve the Mechanical and Optical Characteristics. Afshin Veisi a, * and Saeed Mahdavi b The aim of this study was to determine the optimum combination of wheat straw and white poplar (P.

alba) chemimechanical pulps (CMPs) for producing newsprint CMP was prepared separately from the two raw materials. Papermaking - Papermaking - Processes for preparing pulp: Mechanical or groundwood pulp is made by subjecting wood to an abrading action, either by pressing the wood against a revolving grinding stone or by passing chips through a mill.

The wood fibres are separated and, to a considerable degree, fragmented. Chemical wood pulp is made by cooking wood chips with chemical solutions in digesters. "Secondary Fibers and Nonwood Pulping" Edited by M. Kocurek, F. Hamilton and B.

Leopold Page 2 of 10 processes, properties, pulping, chemical and semichemical, equipment, mechanical and chemimechanical, reconstituted panelboard, sugar cane separation process, types of board, storage methods, biological.

The yield percentage of screened durian rind pulp by chemi-mechanical pulping process is qu ite lower compared to common yield of chemi - mechanical pulping process is about 55 %.

Valmet’s fiber technical know-how provides intelligent, integrated and complete processes for both chemical and mechanical pulping. Our portfolio is built on strong R&D to guarantee high end-product quality.

For improved process efficiency and increased business profitability, turn to Valmet. pulping process is shown in figure Mechanical, semichemical, and sulfite pulp mills differ in detail, particularly in wood preparation, fiber separation, and bleaching, but many of the downstream refining, bleaching, and papermaking processes are similar.

In addition to the primary steps in pulp and paper. chemimechanical pulping: To work out the physics of the mechanical pulping process, and the chemistry of chemime- chanical pulping, so that modified or new processes, that will operate with minimal consumption of energy, will produce pulps that will be stronger and will possess high opacity.

Adaptive control engineering: To lay. This book covers the basics and fundamentals of mechanical pulping including all the processes related to mechanical pulping. View the detailed Table of Contents.

Updated 2. edition ISBN BOOK - Vol 5, Mechanical Pulping Price: 80,00€. The results showed that details of the mechanical pulping process, in CTMP manufacture in particular, may have a strong effect on the fibre charge.

Their relevance to sulfite chemimechanical. Thermomechanical pulp (TMP) is mainly used for mechanical printing papers such as newsprints as well as uncoated and coated magazine papers. The invention and development of thermomechanical pulping process in the ’s rapidly changed the structure of the world’s pulp.

The Stake explosion pulping process with caustic and sulfite chemical pretreatment of wood chips produced aspen (Populus tremuloides) pulp of remarkable strength with appreciably less refining energy than chemimechanical pulping.

About 23% of the pulp used in the world is mechanical pulp. In most usages, however, groundwood pulp is combined with pulps produced chemically, to counteract the disadvantages of paper made with mechanical pulps. The above method of producing groundwood pulp is the oldest pulping process.

Recycled Fiber Processing. Papermaking. References. 5 Cleaner Production Measures in Pulp and Paper Making. Kraft Pulping. Sulfite Pulping. Mechanical and Chemimechanical Pulping. Recycled Paper Processing. Papermaking. References. 6 Recent Developments in Cleaner Production.

Use of Cooking Catalyst. Organo. MECHANICAL PULPING – TMP / CTMP 1 Thermo-mechanical Pulp (TMP) Mechanical pulping consumes a great deal of electrical energy. Much effort has been spent over the years to reduce this. A major early approach was the use of higher temperatures to “soften the lignin”.

This occurs in RMP by the steam generation in the process. This important reference for professionals in the pulp and paper industry details how to improve manufacturing processes that not only cut down on the emission of pollutants but also increase productivity and decrease costs.

Cleaner production measures in the pulp and paper industry, including pulping processes (Kraft, Sulphite and Mechanical), bleaching, recovery, papermaking, and .Book editor: Bruno Lönnberg, (Tech.), Professor emeritus, Åbo Akademi University Volume 5 of the Papermaking Science and Technology Series, published by the Finnish Paper Engineers’ purpose of a mechanical pulping process is to separate the fibres from the wood matrix, hopefully in a form suitable for a specific papermaking process.Chemimechanical Pulping and bleaching properties of a bamboo species Neosinocalamus affinis (Rendle) Keng f.

were reviewed in this paper. The brightness of bleached bamboo chemi-mechanical pulps was usually too low to be used as a furnish in value-added paper products. The effects of various impregnation conditions by using NaOH, Na(2)SO(3) at the temperature of [ ].