Method for loading fibers contained in a pulp suspension

Inactive Publication Date: 2008-09-04
VOITH PATENT GMBH
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  • Application Information

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Benefits of technology

[0017]A further advantage of the present invention is that under certain circumstances it is possible to economize by omitting a machine for thickening, such as the disintegrated pulp during the puling operation is diluted only to such an extent that the subsequent loading can be carried out. In other cases, in particular should greater demands in terms of cleaning of the stock be necessary (waste paper) or should separation of the fibers not be adequately achieved otherwise, it is also possible that thickening, such as in the form of a screw press, may be necessary. The filtrate from such thickening is returned directly into the pulping apparatu

Problems solved by technology

The online production of PCC has, however, never been, nor is it now, considere

Method used

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  • Method for loading fibers contained in a pulp suspension
  • Method for loading fibers contained in a pulp suspension
  • Method for loading fibers contained in a pulp suspension

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Embodiment Construction

[0024]Referring now to the drawings, and more particularly to FIG. 1, which illustrates an embodiment of the present invention, the pulp P, which may be waste paper or alternatively, fresh chemical pulp, is processed in pulping operation 1. Therein, a pulp suspension S is produced by admixing water W with the aid of a mechanical working. The calcium hydroxide in this example is added as milk of lime 7 during the pulping operation, and is provided by slaking lime in the milk-of-lime production stage 5. Optionally, the pulp suspension S may be passed through a cleaning system, not shown here, in which heavy particles and plastics or other trash are removed. Whether this is necessary will depend predominantly on the quality of the raw material. A thickening operation 2 may then take place, but is not always necessary and, therefore, is shown in broken lines. Filtrate 9 from thickening operation 2 is used for pulping operation 1. The precipitation 3 of fine matter, in particular calcium...

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Abstract

The present invention serves for loading a pulp suspension (S) with calcium carbonate. Liquid calcium hydroxide as milk of lime (7) is added during or before the pulp operation (1) carried out to form the pulp. By introducing gaseous carbon dioxide (8) into the pulp suspension thus treated, a chemical reaction is triggered therein, in which the finely divided calcium carbonate is precipitated. The present invention is particularly economic and effective due to the early addition of calcium oxide or calcium hydroxide.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This is a continuation of PCT application No. PCT / EP2006 / 004922, entitled “METHOD FOR LOADING FIBERS CONTAINED IN A PULP SUSPENSION”, filed May 24, 2006, which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a method for loading fibers contained in a pulp suspension, and more particularly to a method of loading cellulose fibers for producing paper or board.[0004]2. Description of the Related Art[0005]In the manufacture of paper, fillers, in particular precipitated calcium carbonate (PCC) or crushed or ground calcium carbonate (GCC), are standard substances which are used to reduce the fiber content and to improve the optical properties of the paper.[0006]Commercially available PCC or GCC fillers are products produced in bulk in special manufacturing facilities which can be associated with a paper mill in the form of a satellite plant. The online productio...

Claims

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Application Information

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IPC IPC(8): D21C3/02D21B1/08D21C3/24
CPCD21H17/70D21C9/004
Inventor PFALZER, LOTHARDOLLE, KLAUS
Owner VOITH PATENT GMBH
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