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Fifteen years of development. Pulp Paper

Читайте также:
  1. Be transferred to paper-grade pulps. The papermaking properties of pulp are
  2. Bleached commercial paper pulp
  3. Chapter Fifteen
  4. CHAPTER FIFTEEN
  5. Fifteen
  6. Later years

Canada, 1984; 85(2): T24–T27.

K. Kringstad, K. Lindstrom, Spent

Liquors from pulp bleaching. Environ.

Sci. Technol., 1984; 18(8): 236–238.

H.U. Suss, Die peroxidgestutzte Sauerstoffdelignifizierung

Von Sulfitzellstoff

– ein Schritt zur Verringerung der AOXBelastung.

Papier, 1986; 40(4): 150–153;

H.U. Suss, N. Nimmerfroh, W. Eul,

J. Meier, Approaches to minimize the

Formation of AOX in Kraft pulp bleaching.

Papier, 1990; 44(7): 339–348.

C.H. Mobius, Abwasser der Papier- und

Zellstoffindustrie, 3. Auflage, 2002,

Revised December, 2004. Available as

pdf file at: www.cm-consult.de.

F. de Souza, M.-C Kolar, K.P. Kringstad,

S.E. Swanson, C. Rappe, B. Glas, Influence

Of chlorine ratio and oxygen

Bleaching on the formation of PCDFs

And PCDDs in pulp bleaching. Tappi J.,

1989; 72(4): 147–153.

N. Nimmerfroh, H.U. Suess,

H.P. Boettcher, W. Luettgen,

A. Geisenheiner, The German approach

to the closed-cycle sulfite mill – development

And implementation. Pulp Paper

Canada, 1995; 96(12): T414–T420.

14 www.aet.org/reports/markets/trends90–

01.

Kretsloppsanpassad massafabrik,

Ecocyclic pulp mill, Final report KAM 1,

English version.

Pulp Properties and Applications

Herbert Sixta

11.1

Introduction

Pulp represents the major raw material basis for two main applications: (a) for

Paper and board production, where the pulp fibers are mechanically modified to

Give a coherent sheet; and (b) for chemical conversion to products such as regenerated

Fibers and cellulose derivatives. The former is denoted as paper grade, the

Latter as dissolving grade pulp. Paper-grade pulp is by far the most dominant field

Of pulp production. With an annual production of about 190 million tonnes in

2002, paper-grade pulp accounts for almost 98% of the total wood pulp production

(see Chapter 1, Tab. 2, Tab. 3 in Part I). A large variety of different unbleached and

Bleached mechanical and chemical pulps comprise the raw material basis for

Paper and board products. The kraft process represents the dominating pulping

Technology (130 million tonnes in 2004), while the sulfite process (being the most

Important pulping method until the 1930s) continuously loses ground and finds

Application only in certain niche markets.

Sulfite pulp is characterized by rather week strength properties, and is typically

Used in products that require good sheet formation and moderate strength. Historically,

Sulfite has been most widely used in newsprint furnish. However, its

Importance in newsprint has been declining in recent years with the increasing

Use of stronger mechanical pulps such as thermomechanical pulp (TMP) and

Chemo-thermomechanical pulp (CTMP). However, their use is mostly restricted


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Читайте в этой же книге: Above 10 000 tons of fiber was considered to be a huge operation. Recovery of | In a hollander, and effluent from the bleach plant was discharged without | This project. In a Canadian project, the target was an effluent-free pulp mill, and | Oxide as an alkalization source for the peroxide stage. This permitted | Chlorine are much smaller, and produce pulp in amounts between 1000 and several | Emissions to the Atmosphere | Tab. 10.1 Selected emission limits to the atmosphere described | Deal with these problems. Brownstock washing following an oxygen delignification | Charged polymers can be used for a further intensification. This process reduces | Complex and a cobalt salt. |
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Increase pollution by causing a higher demand for a chemical to achieve identical| To applications such as newsprint, toilet tissues, and paperboard as they tend to

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