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Method for preparing fibers contained in a pulp suspension

a technology of fibers and suspensions, applied in the field of preparing fibers contained in pulp suspensions, can solve the problems of pcc pigments that are up to 10 times as expensive as pcc or gcc pigments, and have never been or never been considered for online production

Inactive Publication Date: 2005-01-06
VOITH PATENT GMBH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, online production of PCC has never been or is never considered in the paper industry, which can be attributed to the special process properties which are necessary for the production of PCC.
During coating, the necessary optical properties can be achieved by the use of TiO2, but this is a very expensive and abrasive pigment, which can be up to 10 times as expensive as the PCC or GCC pigments.

Method used

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  • Method for preparing fibers contained in a pulp suspension

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Embodiment Construction

According to one embodiment of the present invention at least one of the following devices can be used: a cleaning device, in particular HC cleaner, a mixing device, in particular a static mixer, a lime slaking device, a press, in particular a screw press or belt press, a balancing reactor, a crystallizer, a further mixing device, in particular a static mixer, a CO2 supply device or additional CO2 recovery device, an optional CO2 heater, an optional chemical bleaching agent addition and / or a press water tank.

The formation of crystalline precipitation product particles is associated, inter alia, with the advantage that, if required, relatively high gloss values for the end product can be achieved. It is to be noted that, as a rule, only loaded fibers are ground. The coating color is not ground as a rule but can be ground. In general, this depends on the respective definition, but also on the respective crystallization operation. If CaCO3 crystals are produced in the coating kitche...

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Abstract

A method for one of preparing fibers contained in a pulp suspension and preparing coating color for coated papers including the steps of providing fibers in a suspension form having a predefined solids concentration; loading the fibers with a precipitation product; grinding the fibers with the precipitation product to thereby produce precipitation product particles having a dimension. The dimension being from approximately 0.05 μm to 5 μm. With an additional step of producing crystalline precipitation product particles using the precipitation product particles in an online process directly in a stock preparation line.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preparing fibers contained in a pulp suspension and / or for preparing coating color for coated papers. 2. Description of the Related Art During papermaking fillers, such as, precipitated calcium carbonate (PCC) or comminuted or ground calcium carbonate (GCC) are usual substances which are used for the purpose of reducing the fiber content and of improving the optical properties of the paper. The commercially available PCC or GCC fillers are mass-produced products which are produced in specific manufacturing operations, which can be associated with a paper mill as a satellite plant. However, online production of PCC has never been or is never considered in the paper industry, which can be attributed to the special process properties which are necessary for the production of PCC. Instead, PCC or GCC is transported to the paper mills as a bulk material or in the form of a suspension....

Claims

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Application Information

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IPC IPC(8): D21H17/67D21H17/70D21H19/38
CPCD21H17/675D21H19/38D21H17/70
Inventor DOELLE, KLAUS
Owner VOITH PATENT GMBH
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