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Saturday, August 8, 2020 | History

3 edition of The Grinding of Spruce for Mechanical Pulp found in the catalog.

The Grinding of Spruce for Mechanical Pulp

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  • 11 Currently reading

Published by U.S. Dept. of Agriculture, Forest Service .
Written in English


ID Numbers
Open LibraryOL23519891M
LC Control Numberagr13001550
OCLC/WorldCa18341705

H.L. Hintz, in Encyclopedia of Materials: Science and Technology, Mechanical Pulping Processes. In groundwood (GW) mechanical pulping, wood logs or bolts are pressed against a revolving grinding stone, and fibers and fiber fragments are separated by characteristics are influenced by the stone surface characteristics, stone surface speed, energy consumption, . Audio Books & Poetry Community Audio Computers, Technology and Science Music, Arts & Culture News & Public Affairs Non-English Audio Spirituality & Religion. Librivox Free Audiobook. Church for Life NeedLove Records Presents: Full text of "Ground-wood pulp".

Development of bacterial pretreatment of spruce wood chips for mechanical pulping. In Cost E23 Action Biotechnology for Improving Pulp and Paper Processing: Grenoble, France, November (pp. ). CTP Centre Technique du Papier. The Finnish Pulp and Paper Research Institute. Jari Sirviö. University of Helsinki. The relationship between spruce wood fiber properties, on pulp properties, was investigated. Both fiber length and the cross-sectional dimensions of fibers were studied as a basis for the wood assortments.

The no-load power accounts for all frictional and mechanical losses in the drive system of the mill and can be calculated from No load power D [3 c( Ld L)] kW () Ld is the mean length of the conical ends and is calculated as half the difference between the center-line length of the mill and the length of the cylindrical. When treating refined mechanical pulp and thermo mechanical pulp with ozone, it is of great importance that the process be carried out at the most favorable conditions and with a minimum consumption of energy. According to the present invention the pulp is refined to a freeness value of at least csf in a first stage refiner from which the pulp is passed to a high consistency ozonizer and.


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The Grinding of Spruce for Mechanical Pulp Download PDF EPUB FB2

The Grinding of Spruce for Mechanical Pulp Paperback – January 1, by John Herman Thickens (Author) › Visit Amazon's John Herman Thickens Page. Find all the books, read about the author, and more. See search results for this author. Are you an Author: John Herman Thickens.

Additional Physical Format: Online version: Thickens, The Grinding of Spruce for Mechanical Pulp book. (John Herman) Grinding of spruce for mechanical pulp. Washington, D.C.: U.S. Dept. of Agriculture, Forest. The Grinding Of Cooked And Uncooked Spruce And Substitutes For Spruce In The Manufacture Of Mechanical Pulp [McNaughton, George C.] on *FREE* shipping on qualifying offers.

The Grinding Of Cooked And Uncooked Spruce And Substitutes For Spruce In The Manufacture Of Mechanical Pulp Author: George C. McNaughton. Pratima Bajpai, in Pulp and Paper Industry, Countercurrent Coupling of Paper Machine and Mechanical Pulping White Water Systems.

Mechanical pulping produces pulp through the use of mechanical energy instead of chemicals. Mechanical pulps can be produced by grinding. 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.

The grinding of spruce for mechanical pulp. by J H Thickens, United States. Forest Service. Format: Print Book Publication year: Held by WUR Library. Check Availability. Read Alternate Summary/Abstract. null. Close. of mechanical pulping. Grinding and refining have different treatment processes.

The most used wood for mechanical pulping is spruce, but today pine and hardwood are also increasing the interest. An ideal mechanical fiber pulp can produce a sheet of paper with high opacity, brightness, bulk and smoothness.

increased its quality to equal that of the bleached book grade GW pulp that contains about one part each of spruce, balsam fir, and aspen. KEYWORDS: Aspen, coarse grinding, groundwood pulp, peroxide bleaching, refining.

Improved Aspen Mechanical Pulp Through Coarse Grinding and Refining United States Department of Agriculture Forest Service. The grinding of cooked and uncooked spruce and substitutes for spruce in the manufacture of mechanical pulp / By George C. McNaughton. Abstract. Bound with paper (C.E.)--University of Wisconsin--Madison, Includes bibliographical of access: Internet.

Complete pulp mills Chemical pulping Wood handling Cooking and fiber line Pulp drying Chemical recovery Air emission control Other value-adding processes Dissolving pulping Mechanical pulping Recycled fiber Automation for pulp Services for pulp Fiber Technology Center Pulp news and stories.

Mechanical pulp, generally called groundwood, is usually produced by a mechanical grinding process and is not further classified except as fine, coarse, or bleached.

Chemical pulps are classed as unbleached sulfite (strong and news grade), bleached sulfite (dissolving and paper grade), bleached and unbleached sulfate (kraft), and soda. The pulp-grinding industry in Finland Interest arises in Finland.

The book printer Carl Wilhelm Holmström is the first to plan to manufacture paper from wood in Finland. He receives permission from the Senate to establish a pulp and paper mill in Vyborg.

After whole pulping process, grinding, bleaching and acidification the mechanical pulp is diluted with white water to the storage tank when the pH of the pulp decreases to the pH around 7 because of the white water. From the storage tank the pulp is transferred to the paper machine.

To the mechanical pulp can be added necessary amount of chemical. Grinding — invented in by F.G. Keller in Germany (Lönnberg ) — is the oldest mechanical pulping process; and answering v.

Alfthan’s question (), it is still a viable process that produces fibers and fines with high yield and low cost compared to other mechanical pulping processes, and to chemical pulping.

Mechanical actions such as grinding and refining can also damage fibres and contribute further to reduction in strength (Page and El-Hosseiny, ; Page and Seth, ).

The strength properties of mechanical pulp can be improved by either a chemical pre-treatment, mixing chemical and. Semi-chemical Mechanical Pulp. The Semi-chemical mechanical pulp is that raw material is processed by chemical light treatment, and then ground into pulp by the mechanical process.

Wood is main raw material, and the pulp yield reaches as high as 94%. Common chemical treatment is the alkali process or cooking method under low pressure for a. Twenty seven manu- factured mechanical pulp and five both mechanical and chemical pulp.

Taking the returns of 32 mills, the average time the mills ran during the year was about nine months. Pulp Wood and Wood Pttlp, 37 The power to drive the mills was equal to. USA US05/, USA USA US A US A US A US A US A US A US A US A US A Authority US United States Prior art keywords stone wood chips process grinding pulp Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.

The timber resources used to make wood pulp are referred to as pulpwood. While in theory any tree can be used for pulp-making, coniferous trees are preferred because the cellulose fibers in the pulp of these species are longer, and therefore make stronger paper. Some of the most commonly used softwood trees for paper making include spruce, pine, fir, larch and hemlock, and hardwoods such as.

Aspen T and Spruce T. Table 1 lists the yield, mean size, Zeta potential, mobility, and carboxyl group content of the nanocellulose products. As can be seen, the yields of Spruce F and Spruce T. Thermomechanical pulping rapidly displaced traditional mechanical pulping, grinding, because similar paper properties could be achieved using fewer amounts of expensive reinforced kraft pulp.

Today, thermomechanical pulping process is the most dominate mechanical pulping process. The future of the process is, however, at stake. The continually.commercial BCTMPs.

Additionally, the use of HC-LC refined spruce-pine-fir (SPF) pulp as the middle-ply furnish in a three-ply FBB was investigated. It was found that sulphite pretreatment of HC-LC refined pulp had no clear effect on FBB properties.treatment were evaluated for production of thermomechanical pulp in mill scale trials using Norway spruce (Picea abies) at the Braviken paper mill (Holmen Paper AB, Sweden).

The general aim of the study was to improve the energy efficiency during the production of mechanical pulps suitable for news and improved news grade papers.