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Method and apparatus for loading fibers or cellulose which are contained in a suspension with a filler

Inactive Publication Date: 2008-01-31
VOITH PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0015] Through the addition of carbon dioxide and by depositing it on the fibers or on the cellulose material in form of a suspension prior to adding milk of lime or slaked lime a chemical reaction which is as complete and fast as possible can be achieved on the one hand and an efficient loading of the fiber surfaces (inside and outside) or of the cellulose on the other hand. When adding milk of lime or slaked lime the chemical reaction occurs immediately, thereby influencing the loading process very positively. Integration to the greatest possible extent and encasement of the fibers, inside as well as outside, or of the cellulose with calcium carbonate is achieved.
[0034] The present invention also provides an apparatus for loading of fibers or cellulose which are contained in a suspension with a filler by way of a chemical precipitation reaction, wherein the fibers or cellulose are provided in the form of a suspension having a predetermined solids concentration. This apparatus is characterized in that at least one reactor is provided in which the fibers or the cellulose in form of a suspension to which carbon dioxide has been added are mixed with milk of lime or slaked lime, thereby triggering and extensively, such as completely, concluding the chemical precipitation reaction.

Problems solved by technology

The disadvantage of these cited methods consists especially in that they offer only a low degree of effectiveness since the milk of lime or the slaked lime, cover the surfaces of the fibers or the cellulose, thereby blocking access of the carbon dioxide.
This impedes particularly a loading of the interior fiber surfaces (lumen).

Method used

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  • Method and apparatus for loading fibers or cellulose which are contained in a suspension with a filler
  • Method and apparatus for loading fibers or cellulose which are contained in a suspension with a filler

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Embodiment Construction

[0040] Referring now to the drawings, and more particularly to FIG. 1, there is shown a schematic depiction of a device 1 for loading fibers 2.1 or cellulose 2.2 which are contained in a suspension 3 with a filler 4 by way of a chemical precipitation reaction, wherein the fibers 2.1 or the cellulose 2.2 in form of a suspension 3 are made available with a pre-determined solids concentration c.

[0041] The apparatus 1 includes reactor 5 in which the fibers 2.1 or the cellulose 2.2 in form of a suspension 3 to which carbon dioxide 6 has been added are mixed with milk of lime or slaked lime 7, thereby triggering and extensively, such as completely, concluding the chemical precipitation reaction. The carbon dioxide 6 can be added to the suspension 3 as pure carbon dioxide and / or as flue gas.

[0042] In the example of apparatus 1 depicted in FIG. 1 the addition of the carbon dioxide 6 and mixing of the milk of lime or slaked lime 7 occurs in batch operation.

[0043] The reactor 5 includes at...

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Abstract

The present invention provides a method for the loading of fibers or cellulose included in a suspension with a filler by way of a chemical precipitation reaction, wherein the fibers or cellulose are provided in the form of a suspension having a predetermined solids concentration. Carbon dioxide is added to the fibers or to the cellulose in the form of a suspension. The fibers or the cellulose in form of a suspension to which carbon dioxide has been added are mixed with milk of lime or slaked lime, such as in at least one reactor, thereby triggering and extensively, such as completely, concluding the chemical precipitation reaction.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This is a continuation of PCT application No. PCT / EP2005 / 011498, entitled “METHOD AND DEVICE FOR LOADING FIBERS OR CELLULOSE CONTAINED IN A SUSPENSION WITH A FILLER”, filed Oct. 27, 2005. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The invention relates to a method as well as to an apparatus for loading of fibers or cellulose contained in a suspension with a filler by way of a chemical precipitation reaction, wherein the fibers or cellulose are provided in the form of a suspension having a predetermined solids concentration. [0004] 2. Description of the Related Art [0005] In the production of fibrous webs, especially paper or cardboard webs fillers, especially precipitated calcium carbonate (PCC) or disintegrated or ground calcium carbonate (GCC) represent conventional substances which are used to reduce the fibrous material content as well as to improve the optical characteristics of the web. [0006] The commerci...

Claims

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Application Information

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IPC IPC(8): D21H11/16D21H17/70
CPCD21H11/16D21H17/70D21H17/675
Inventor GATHER, REINHARD
Owner VOITH PATENT GMBH
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