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Tuesday, November 10, 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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Published by U.S. Dept. of Agriculture, Forest Service .
Written in English


ID Numbers
Open LibraryOL23519891M
LC Control Numberagr13001550
OCLC/WorldCa18341705

a range of abrasive machining processes with grinding wheels, making this probably the most complete book regarding all kinds of grinding operations. The aim of this book is to present a unified approach to machining with grinding wheels that will be useful in solving new grinding problems of the future. ed and of low quality. Grinding was continued, but the quality had not greatly improved after minutes. The data in table 2 show the quality of this pulp. Spruce was then ground (run No. 78, table 1) for 41 minutes under the, same pressure. The freeness of the spruce pulp . in the pulps produced from spruce and other softwoods but, even so, can be used in appreciable quantities as filler stock in the manufacture of book, magazine, and newsprint paper. Groundwood pulp made from paper birch has similar properties. The absorbent quality of this pulp was demonstrated in the production of a highly absorbent toweling paper.


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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, J. (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 The Grinding of Spruce for Mechanical Pulp book 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 The Grinding of Spruce for Mechanical Pulp book 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.

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.

"Mechanical Pulping" Volume 2 of the Pulp and Paper Manufacture Series Page 1 of 5 pp., 7" x 11" soft cover Item Number: MS 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.

Enzyme-Assisted Mechanical Fibrillation of Bleached Spruce Kraft Pulp to Produce Well-Dispersed and Uniform-Sized Cellulose Nanofibrils Huiyang Bian,a,b aGuanlian Li,a a,Liang Jiao, Zhihuai Yu,a and Hongqi Dai * Cellulose nanofibrils (CNFs) are bionanomaterials with many promising properties and great potential in composite applications.

Rayonier Advanced Materials makes Forest Stewardship Council ® (FSC ®) certified (FSC ®-C) newsprint and bulk paper using virgin pine and spruce fiber from Canadian forests. This modern facility produces a clean strong sheet – with superior uniformity, reliability and runnability – suitable for a wide range of printing processes.

Materials and Methods. All tests have been performed using primary and secondary fines, separated from never-dried, unbleached softwood kraft pulp (a mixture of spruce and pine), never-dried, bleached sulfite pulp (spruce), as well as mechanical pulp fines from never-dried, bleached pressure ground wood (spruce).

Mechanical pulp In the case of mechanical pulp, the wood is processed into fibre form by grinding it against a quickly rotating stone under addition of water.

The yield* of this pulp amounts to approx. 95%. The result is called wood pulp or MP – mechanical pulp. The disadvantage of this type of pulp. Wood of two poplar (Populus × euramericana [P. canadensis]) clones (cl.

I and cl. Robusta) was used for the production of stone groundwood pulp at a mill scale. Two variants regarding wood moisture content before grinding (fresh and seasoned wood), and three sub-variants regarding volume share of spruce wood (the ratios of poplar:spruce are ;and % poplar wood).

Method of converting logs or wood chips into paper pulp for use in papermaking accomplished by mechanical grinding, as opposed to chemical purpose of pulping is to reduce wood (or other fibrous raw material) to individual cellulose fibers.

A non-fibrous constituent of wood, lignin, binds cellulose fibers together, and is primarily responsible for reducing paper quality and its. Chemical Mechanical Yield Fibre/Wood - Low % - High % Cellulose Purity - High - lignin - Low - lignin dissolved remains End Uses - Dissolving pulp - Low quality - High quality paper - High volume paper (e.g.

book) (e.g. newsprint) - Reinforcement pkg. - Molded products Raw Material Sensitivity - Low - High General Parameters. a book series covering the latest technology and future trends Book 5 Second Edition 40Fundamental mechanisms in mechanical pulping, especially grinding Impacts of water jet conditioning on grinding process variables and pulp properties Water Jet Control system.

Introduction. Norway spruce (Picea abies (L.) Karst.) is a major softwood species in Europe used extensively in pulp mills for mechanical and kraft pulp production, and in sawmills to produce wood industrial processing originates large quantities of biomass as residual materials that accumulate at mill site and may be considered as side-streams available for valorization under a.

jack pine look like black spruce pulp, (Fig. 16). This demonstrates the potential The LCNFs particles were prepared by using a mechanical grinding method with a w-profile grinding stone that.Though Matthias Koops in England produced paper from wood pulp as early ascredit for the discovery of the industrial process for making wood pulp paper is generally given to the German machinist and inventor Friedrich Gottlob Keller, and to the Canadian poet and inventor Charles Fenerty, both of whom appear to have independently announced the discovery of similar processes in With a view to possible advantages in getting pulpwood to the mill in optimum condition for grinding (m.c.

%, and as white as possible), moisture loss during storage was studied under various conditions on 10 sites in S. and S.W. Germany, with special reference to the period over which wood felled in a given month could be left in the forest before its green m.c.

(ca. % all the year.