Method of making paper or board

Pending Publication Date: 2021-09-02
NOVOZYMES AS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about a mixture of carbohydrate-active enzyme, liquid natural polymer, and strength agent that can be used to make paper or board and improve its refinability and strengthening potential. The mixture can be added to a pulp slurry before or after refining in the paper or board mill. The treatment results in a reduced freeness of the refined pulp slurry, increased tensile strength of the paper or board product, and improved structural properties.

Problems solved by technology

Although effective, refining consumes a significant fraction of the total energy required during the manufacture of paper and board.

Method used

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  • Method of making paper or board
  • Method of making paper or board

Examples

Experimental program
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Effect test

example 1

ent of Cellulosic Fiber with a Combination of Liquid Natural Polymer and Enzyme

[0095]Ten pulp samples—equivalent to 24 grams of oven dry bleached eucalyptus kraft fiber each—were prepared by diluting never-dried pulp fiber to 10% w / w consistency with deionized water. The resultant pulp slurries (pH 7.8) were then pre-incubated for 20 minutes at 40° C. After pre-incubation, a liquid composition of liquid natural polymer, LNP derived from waxy corn starch, cellulase A of SEQ ID No: 1 from Novozymes (Bagsvaerd, Denmark) and / or cellulase B of SEQ ID No: 2 from Novozymes (Bagsvaerd, Denmark) were added to the 10 pre-heated aliquots according to table 1.

TABLE 1LNPCellulase ACellulase BSample #Identifier(kg / t)(g / t)(g / t)1Control———2EGA50— 50—3EGA100—100—4EGB50—— 505EGB100——1006LNP5——7LNP + EGA505 50—8LNP + EGA1005100—9LNP + EGB505— 5010LNP + EGB1005—100

[0096]When applicable, formulated liquid natural polymer was added to deliver 5 kg of dry waxy corn starch per metric ton of oven dry bleach...

example 2

er Pretreatment of Cellulosic Fiber with a Combination of Liquid Natural Polymer and Enzyme

[0100]Thirteen pulp slurries were prepared by diluting 24 grams of oven dry equivalents of never-dried bleached eucalyptus kraft fiber to 10% w / w consistency with deionized water. The resultant pulp slurries (pH 7.8) were then pre-incubated separately for 20 minutes at 40° C. After pre-incubation, the pulp slurry was divided into one group of four and three groups of three. The first group of four served as the untreated control group (labelled “Control”). The first group of 3 slurries (labelled “LNP”), were treated with a liquefied waxy corn starch (Ingredion, Westchester, Ill.). The second group of 3 slurries were treated with cellulase A of SEQ ID No: 1 from Novozymes (Bagsvaerd, Denmark) (labelled “Cellulase A”). The third group of 3 slurries was treated with both the Cellulase A and the liquefied waxy corn starch (labelled “LNP+Cellulase A”). In all relevant instances, formulated liquefie...

example 3

ent of Cellulosic Fiber with a Combination of Liquid Natural Polymer and Enzyme

[0106]Once-dried bleached eucalyptus kraft pulp (BEKP) was soaked in deionized water at 10% w / w consistency at room temperature overnight and was repulped at 500 rpm for 5 minutes. The resultant pulp was concentrated by centrifuge, dispersed, and stored at 4° C. before use.

[0107]Four pulp samples—equivalent to 24 grams of oven dry fiber each—were prepared by diluting to 4.0% w / w consistency with deionized water. The resultant pulp slurries (pH 6.8) were then pre-incubated for 30 minutes at 40° C. After pre-incubation, a liquid composition of liquid natural polymer, LNP derived from waxy corn starch, and cellulase A of SEQ ID No: 1 from Novozymes (Bagsvaerd, Denmark) were added to the pre-heated pulp slurries according to Table 2.

TABLE 2LNPCellulase ASample #Identifier(kg / t)(g / t)1BEKP-ctrl——2BEKP-Enz—1503BEKP-LNP7.5—4BEKP-LNP / Enz7.5150

[0108]When applicable, the formulated liquid natural polymer was added t...

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Abstract

Disclosed herein is a mixture comprising at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent. The mixture is useful in methods of making paper or board and methods of improving refinability and / or strengthening potential of paper pulp for use in a paper or board mill. In such methods the mixture is added to a cellulosic material containing pulp slurry in the process of making paper or board products.

Description

REFERENCE TO SEQUENCE LISTING[0001]This application contains a Sequence Listing in computer readable form. The computer readable form is incorporated herein by reference.[0002]SEQ ID No: 1 is a Q120H variant of the mature endoglucanase shown as SEQ ID NO: 9 of WO 96 / 29397.[0003]SEQ ID No: 2 is a variant of endoglucanase.FIELD OF THE INVENTION[0004]The present invention relates to methods of making paper or board and methods of improving refinability and / or strengthening potential of pulp for use in a paper or board mill.BACKGROUND OF THE INVENTION[0005]Processes for the preparation of paper, such as printing, writing, decorative, special or tissue-type papers, and / or board, such as kraft liner, test liner, corrugating medium or boxboard, through the use of cellulose pulps are known.[0006]To impart desired papermaking properties in cellulosic fiber, pulp is subjected to mechanical processing—termed refining. Within the refiner, pulp is exposed to tension, compression and shear during...

Claims

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Application Information

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IPC IPC(8): D21C9/00D21D1/20D21H17/28D21H21/18D21H27/00D21J1/00
CPCD21C9/005D21D1/20D21J1/00D21H21/18D21H27/005D21H17/28D21H17/005D21H17/29D21H17/22D21H17/25D21H25/04D21D1/00
Inventor GENG, XINGLIANCHUNG, CHEN YUNPOWELL, JOHNDAMIAO, PRISCILLA MONTOAN
Owner NOVOZYMES AS
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