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Freeness of paper products

a paper product and free technology, applied in the field of new refining process of paper pulp, to achieve the effect of improving the refining effect of these fibers, improving refining properties, and increasing tensile strength properties

Inactive Publication Date: 2013-05-23
CATEXEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a method for improving the refining of cellulosic fibers by using a preformed transition metal complex of azacyclic molecules and hydrogen peroxide. This treatment can be applied before, during, or after the refining process. The refining properties of the fibers can be improved by increasing their tensile strength at the same mechanical energy input and same Shopper-Riegler value. Additionally, the energy consumption and time required to reach a cellulose pulp suspension that can be further processed to a web with improved freeness can be reduced by the use of a manganese catalyst together with hydrogen peroxide.

Problems solved by technology

In addition, despite the facts that within the pulp / paper field it is widely acknowledged that significant reduction of the viscosity loss of cellulose is not desirable for paper-making properties, and that the use of the manganese catalysts comprising Me3-TACN gives significant viscosity loss, according to different studies, it is particularly surprising to have found that the use of such catalysts leads to an improvement of the effect of refining process on the fiber properties.

Method used

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Examples

Experimental program
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Effect test

experiment 1

[0092] Treatment of softwood pulp with hydrogen peroxide with and without [Mn2(μ-O)3(Me3TACN)2](CH3COO)2 at pH 11.0 (Me3-TACN=1,4,7-Trimethyl-1,4,7-triazacyclononane).

[0093][Mn2(μ-O)3(Me3TACN)2](CH3COO)2 (as 3.5% aqueous solution) was obtained as disclosed elsewhere (WO2006 / 125517).

[0094]Softwood pulp with a starting ISO-brightness of 49.9 was treated as follows: To a polyethylene (PE) bottle containing 250 g of oven-dry pulp at 10% consistency, was added 10 kg / odtp H2O2 (odtp=oven-dry ton pulp—equals to 29.4 mM H2O2) and 7.2 kg / odtp NaOH (equals to 18 mM NaOH). Depending on the experiments 0.04 kg / odtp [Mn2(μ-O)3(Me3TACN)2](CH3COO)2 (equals to 6.5 μM [Mn2(μ-O)3(Me3TACN)2](CH3COO)2)was added and 1.0 kg / odtp DTPA (Diethylenetriaminepenta-acetic acid, pentasodium salt)—(ex Akzo Nobel; trade name Dissolvine D50; purity is 50%). The initial pH-value was pH 11.0 (measured at 20° C.).

[0095]Note 1: This softwood pulp has been delignified in a O2-delignification step, and partly further ble...

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Abstract

The present invention provides for the optimisation of conditions for treating pulp with a catalyst and hydrogen peroxide to produce a Freeness value (SR) in a web produced from the treated pulp such that the energy required in mechanical agitation of the pulp is reduced.

Description

FIELD OF INVENTION[0001]The present invention relates to a new refining process for paper pulp.BACKGROUND OF THE INVENTION[0002]Pulp for making paper, tissues, board or related products may be obtained from cellulose from wood and other sources (e.g., hemp, straw, cotton). The vast majority of the raw material is wood pulp, which can be either softwood or hardwood raw material. Softwood fibres come from needle-bearing conifer trees such as pine, spruce, alpine fir, Douglas fir. Hardwood fibres are derived from deciduous trees of various types, such as birch, eucalyptus, and acacia. Mechanical pulp contains most of the original lignin, whilst in chemical pulp most of the lignin has been removed.[0003]Among the distinguishing differences between softwood (SW) and hardwood (HW) fibres are the length of the individual cellulosic fibres of the wood, the coarseness of the fibres and the stiffness / collapsibility of the fibres.[0004]Hardwood and softwood must be subjected to specific mechan...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21D1/20
CPCD21C9/001D21C9/10D21C9/1042D21D1/20D21C9/163D21D1/00D21F1/0009D21C9/1078
Inventor HAGE, RONALDYANG, KIMBERLY SORAYA
Owner CATEXEL
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