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Use of hemicellulase composition in mechanical pulp production

a technology of mechanical pulp and composition, which is applied in the field of mechanical pulp refining, can solve the problems of pulp material strength impairment and high energy consumption of grinding and refining wood or wood chips, and achieve the effect of less energy production and increased strength

Inactive Publication Date: 2005-01-06
BUCKMAN LAB INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] Pulp and paper products made therefrom having increased strength are provided. Pulp and papers made therefrom which require less energy to produce are provided.

Problems solved by technology

Grinding and refining of wood or wood chips can have a high energy consumption.
The use of enzymes, for example, cellulases, has been reported to weaken the wood fibers due to the hydrolytic action on cellulose, resulting in a pulp material having impaired strength.

Method used

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  • Use of hemicellulase composition in mechanical pulp production
  • Use of hemicellulase composition in mechanical pulp production
  • Use of hemicellulase composition in mechanical pulp production

Examples

Experimental program
Comparison scheme
Effect test

example 1

Freeness

[0066] Mannanase was added in an amount of 0.171 pounds / ton dry pulp to TMP at a temperature of 85° C. The treated consistency was 3%. The treated pulp was placed in a Valley beater at a temperature of 20° C., a pH of 5.13, and the resulting pulp had a consistency of 1.57%. The treated TMP was measured for freeness at various time intervals during beating. A control sample was also measured. As the results in the table and FIG. 1 demonstrate, the freeness significantly affected by the treatment with mannanase.

Canada Standard Freeness (C.S.F.) Results ofMannanase Treated Fiber ModificationTimeControlMannanase Treated(minutes)Freeness ValueFreeness Value 0485470 542542520360370352853006520018095100100

example 2

Mannanase Activity Assay at Elevated Temperatures

[0067] Mannanase activity was determined using a 0.5% solution of locust bean gum galactomannan (available from Sigma-Aldrich, St. Louis, Mo., as Sigma G-0753) as the substrate. Diluted mannanase and the substrate were incubated at a targeted temperature and pH 5.0 for 5 min. Released reducing sugars were assayed by adding 3,5-dinitrosalicylic acid (DNS) solution. The mixture was boiled in a water bath for 5 min. After cooling, the absorbency was measured at 540 nm. The optimal temperature for this enzyme is about 80° C., as shown in the table below.

Temperature, ° C.Relative Activity, %4030503760567082801009061

example 3

Enzymatic Hydrolysis of Southern Pine TMP Reject Pulp

[0068] Southern pine TMP reject pulp with a consistency of 2.5% was treated with mannanase in an amount of 1 mg / g of pulp at 80° C. and pH 5.0 for 30 minutes. The control experiment was run at exactly the same conditions except mannanase was not added. The amount of reducing sugar released was determined by DNS method. The control did not release any detectable amount of reducing sugar, while the mannose-treated pulp released about 1 mg / g of pulp. This demonstrates that mannanase can hydrolyze the mannan component in TMP pulp in a relatively short time and at a high temperature similar to the conditions of a TMP mill process.

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Abstract

Methods for reducing energy required for a pulp refining processes by treating a mechanical pulp with a hemicellulase composition are presented. The enzymatic treatment can be carried out at a temperature of from about 10° C. to about 90° C., and / or at a pH of from about 2 to about 10. Paper made from the treated pulp has improved strength over paper made from untreated pulp.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority under 35 U.S.C. 119 of U.S. provisional application Ser. No. 60 / 468,219, filed on Nov. 15, 2002, the contents of which are fully incorporated herein by reference.FIELD OF THE INVENTION [0002] The present invention relates to methods for refining mechanical pulp, pulp made from such methods, and paper and paperboard products including the pulp. BACKGROUND [0003] Mechanical pulp is made from wood or wood chips, in which the wood fibers are separated by grinding or refining to obtain a desired freeness. Grinding and refining of wood or wood chips can have a high energy consumption. The use of heat and / or chemicals, as in thermomechanical pulp (TMP) production and chemithermomechanical pulp (CTMP) production, can lower the energy consumption. However, it is desirable to find means to further lower the energy consumption requirements for mechanical pulp production. [0004] Wood includes cellulose, lignin, hemi...

Claims

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Application Information

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IPC IPC(8): C12N9/24D21B1/16D21C5/00D21C9/00D21D1/20D21H11/20D21H25/02
CPCC12Y302/01008C12Y302/01078D21B1/16C12N9/2494D21C9/001D21D1/20C12N9/2482D21C5/005B27N1/00
Inventor TAYLOR, JAMES L.JAQUESS, PERCY A.LUND, HENRIKPEDERSEN, HANNE HOSTXU, HUICLEMMONS, JULIE
Owner BUCKMAN LAB INT INC
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