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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.

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