Студопедия
Случайная страница | ТОМ-1 | ТОМ-2 | ТОМ-3
АвтомобилиАстрономияБиологияГеографияДом и садДругие языкиДругоеИнформатика
ИсторияКультураЛитератураЛогикаМатематикаМедицинаМеталлургияМеханика
ОбразованиеОхрана трудаПедагогикаПолитикаПравоПсихологияРелигияРиторика
СоциологияСпортСтроительствоТехнологияТуризмФизикаФилософияФинансы
ХимияЧерчениеЭкологияЭкономикаЭлектроника

In Teltow-Seehof. Das Papier,

1991; 12: 764–772.

91 Krassig, H.A., Cellulose: Structure, Accessibility

And Reactivity. Polymer Monographs.

M.B. Huglin, Ed.. Vol. 11. Gordon

And Breach Science Publishers,

1993: 258–323.

Schenker, C., M.A. Heath, Development

Of high purity dissolving wood pulp for

tire cord production. Tappi, 1959; 42(8):

709–712.

Patt, R., D.L.-K. Wang, Qualitatsbeurteilung

von Chemiezellstoffen. Teil 2:

Alkaliloslichkeit und Gesamtzuckeranalyse.

Das Papier, 1987; 41(1): 7–12.

Methylenblue method, In Methods in

Carbohydrate Chemistry, Academic

Press, New York, ed.: R.L. Whistler, Vol.

III, 35–36.

Steinmeier, H., Acetate manufacturing,

Process and technology. Chemistry of

Cellulose Acetylation. In Macromol.

Symp. 208; [Cellulose Acetates: Properties

and Applications, ed.: R. Rustemeyer,

Wiley-VCH], 2004, 49–60.

II

Mechanical Pulping

Jurgen Blechschmidt, Sabine Heinemann, and Hans-Ulrich Suss

Handbook of Pulp. Edited by Herbert Sixta

Copyright © 2006 WILEY-VCH Verlag GmbH &Co. KGaA, Weinheim

ISBN: 3-527-30999-3

©2006 WILEY-VCHVerlag GmbH&Co.

Handbook of Pulp

Edited by Herbert Sixta

Introduction

Jurgen Blechschmidt and Sabine Heinemann

There are two technological principles to produce paper pulp from wood, namely

Mechanical processes or chemical processes. Whereas in chemical pulping the

yields are only about 45–55%, mechanical pulping uses about 80–95% of the fiber

Wood. Whilst this represents a source for the economic potential of mechanical

Pulps, the higher yield results in certain unfavorable properties compared to

Chemical pulp. Thus, fromthe sameportion ofwood, a double quantity of mechanical

Pulp is produced compared to chemical pulp. The increasing demand for paper and

Board has led to a permanent increase in mechanical pulp production (Fig. 1.1).

Fig. 1.1 Worldwide development of mechanical pulp production [1].

Among the total amount of paper pulp produced, mechanical pulp accounts for

about 20%.

Although mechanical pulping is a thermomechanical process, chemical processes

May also play a certain role. The mechanical defibration of wood is carried

Out in two different ways (Fig. 1.2), namely as a grinding process or as a refining

Process. The following definitions have been formulated for the products of those

processes:

Handbook of Pulp. Edited by Herbert Sixta

Copyright © 2006 WILEY-VCH Verlag GmbH &Co. KGaA, Weinheim

ISBN: 3-527-30999-3

_ Mechanical pulp: this is manufactured by mechanical defibration

Using a variety of mechanical procedures.

_ Stone groundwood: this is manufactured from round logs in a

Grinder.

_ Refiner mechanical pulp: this is manufactured by the mechanical

Defibration of wood chips in a disc refiner.


Дата добавления: 2015-10-21; просмотров: 93 | Нарушение авторских прав


Читайте в этой же книге: Thermal treatment has a negligible effect on the amount of nonfreezing bound | Alkaline processing due to limited swelling conditions. The results indicate that | Has been extensively investigated and technologically developed by Fischer | Degradation kinetics can be described by means of zero order, whereby using the | Structure of the cellulosic material and the type of chemical interaction with the | Parameters Viscose products Cellulose acetate High-viscosity ether | Study of different approaches for analyzing | The prehydrolysis-alkaline sulfite process | In the viscose process. Svensk. Papperstidn., | Kunze, J., A. Ebert, H.-Fink, Characterization |
<== предыдущая страница | следующая страница ==>
Composition in sulfate and sulfite| Fig. 1.2 An overview of the basic mechanical pulping procedures.

mybiblioteka.su - 2015-2024 год. (0.006 сек.)