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Filler for papermaking process

A technology of fillers and cellulose derivatives, applied in papermaking, fillers of cellulose derivatives, preparation of fillers, and preparation of the fillers, which can solve the problems of final product sizing loss and other issues

Active Publication Date: 2007-01-17
AKZO NOBEL PULP & PERFORMANCE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, loss of sizing on the final product may occur due to inversion or migration of the sizing material, evaporation of the sizing material, mechanical wear of the product, etc.

Method used

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  • Filler for papermaking process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Fillers according to the invention and fillers for comparison were prepared by treating a material containing calcium salts with a cellulose derivative. The cellulose derivative used is DS NI (DS CA =DS CM =DS A =DS NA =DS NI ) of carboxymethylcellulose ("CMC") of 0.3, 0.32 and 0.7, respectively. Another CMC used is DS CA =DS CM =DS A =0.4;DS C =DS QN = 0.17; and DS NI =DS NA =0.4-0.17=0.23 quaternary ammonium carboxymethylcellulose ("QN-CMC"). The average molecular weight of the cellulose derivative used is 100,000-400,000. The materials used containing calcium salts were of surface area 5.7 and 10.0 m 2 / g of different precipitated calcium carbonates ("PCC"). Another calcium salt-containing material used is SuperFill(R) (PCC on pulp fines).

[0053]Fillers were prepared by dissolving CMC in water to a concentration of 0.5 wt%. Thereafter, the resulting CMC composition was added to the PCC filler slurry and mixed at a temperature of about 50°C for 25-4...

Embodiment 2

[0061] The sizing of the papers prepared according to the invention was evaluated and compared with the papers used for comparative purposes. Paper according to the invention was prepared using IP1 according to Example 1. Papers for comparison were prepared using CP1 according to Example 1 and using fillers without cellulose derivatives.

[0062] Sheets were prepared from pulp consisting of chemical pulp and containing varying amounts (wt% on dry paper) of untreated PCC as shown in Table 1 . 2.0 kg / ton of dry fibers of the filler according to Example 1 and fillers without cellulose derivatives; 3.0 kg / ton of dry fibers of AKD (aqueous dispersion Eka Keydime C223), and cationic starch containing (Eka PL 1510) and silica particles (Eka NP 780) retention system. Cationic starch and silica particles were added in an amount of 0.15 kg / ton dry fiber. The order of joining is as follows:

[0063] Addition of PCC processed by CMC: 0 ​​seconds

[0064] Addition of AKD dispersion: 3...

Embodiment 3

[0071] In this example, a papermaking process according to the invention was evaluated wherein (i) CMC-treated PCC was added to the pulp suspension and (ii) CMC and PCC (untreated) were added separately to the pulp suspension.

[0072] From the PCC used in Example 2 and containing 30 wt % untreated PCC (surface area 10 m 2 / g) or CMC (DS NI 0.3) Processed PCC (10m 2 / g) (IP2 according to Example 1) to prepare a sheet from the same type of pulp. To the pulp suspension was added 4 kg / ton dry fiber of cationic starch (PB 970), 3.0 kg / ton dry fiber of AKD (containing water size dispersion Eka Keydime C223), and containing cationic polyacrylamide (Eka PL 1310) and Retention system of silica particles (Eka NP 780). Both cationic polyacrylamide and silica particles are added in an amount of 0.20 kg / ton of dry paper. When using untreated PCC, add 1.0kg / ton of DS separately NI CMC of 0.3. When CMC-treated PCC was added, CMC was not added alone. The order of joining is as follows...

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Abstract

The present invention relates to a filler comprising calcium salt and cellulose derivative having a degree of substitution of net ionic groups up to about 0.65, wherein the filler is substantially free from fibres or fibrils of cellulose or lignocellulose. The invention also relates to a filler comprising calcium salt and a cellulose derivative having a degree of substitution of net ionic groups up to about 0.65, wherein the cellulose derivative contains cationic groups. The invention further relates to a method of producing a filler which comprises mixing a calcium salt-containing material with a cellulose derivative having a degree of substitution of net ionic groups up to about 0.65 in the substantial absence of fibres or fibrils of cellulose or lignocellulose. The invention also relates to a method of producing a filler which comprises mixing a calcium salt-containing material with a cellulose derivative having a degree of substitution of net ionic groups up to about 0.65, wherein the cellulose derivative contains cationic groups. The invention further relates to a filler obtainable by the methods. The invention further relates to a papermaking process which comprises providing an aqueous suspension containing cellulosic fibres, introducing into the suspension a filler comprising calcium salt and cellulose derivative having a degree of substitution of net ionic groups up to about 0.65, wherein the filler is substantially free from fibres or fibrils of cellulose or lignocellulose, and dewatering the suspension to form a web or sheet of paper. The invention also relates to a papermaking process which comprises providing an aqueous suspension containing cellulosic fibres, introducing into the suspension a filler calcium salt and cellulose derivative having a degree of substitution of net ionic groups up to about 0.65, wherein the cellulose derivative contains cationic groups, and dewatering the suspension to form a web or sheet of paper.

Description

[0001] The present invention relates to a filler comprising a calcium salt and a cellulose derivative. The invention further relates to a process for preparing the filler, the use of the filler in papermaking, a papermaking process in which the filler is used as an additive, and paper comprising the filler. Background of the invention [0002] Highly filled papers are an established trend in the paper industry, not only because of savings from reduced use of fibers but also because of improved product qualities such as higher opacity and better printability. Calcium carbonate based fillers are commonly used due to their excellent light scattering properties. A major drawback in the production of highly filled papers, especially those containing fillers of high surface area, is the high consumption of sizing agents. Thus, as the filler content in the paper increases, a larger amount of sizing agent is required to obtain a corresponding sizing result. There...

Claims

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Application Information

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IPC IPC(8): D21H17/67D21H17/26D21H23/04
CPCD21H23/04D21H17/675D21H17/74D21H17/26D21H17/67D21H3/00D21H23/00
Inventor P·M·范德豪斯特E·萨尼K·R·安德森C·伽西雅-林德格伦M-L·瓦尔比尔格S·万斯托姆
Owner AKZO NOBEL PULP & PERFORMANCE CHEM