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Use of enzymes for reduction in refining energy - laboratory

ABSTRACT: We performed laboratory and process-scale studies with mixtures of cellulase and hemicellulase enzymes for reducing the refining/beating energy requirement of different types of pulp. Those included hardwood kraft pulp, long fiber fraction of bamboo pulp, old corrugated containers (OCC), and mixed pulp containing new double-lined kraft cuttings (NDLKC) and long fiber fraction of bamboo pulp. In the laboratory, the refining energies were reduced by 18%-45% for different pulps with these enzymes. The strength properties of pulps were not affected by enzyme treatment. In the process-scale trials, use of one of the enzyme products in the production of high strength extensible sack kraft paper (ESKP) reduced the required refining energy by 25 kWh/metric ton of pulp. It also yielded savIngs in steam consumption per ton of paper of about 20% from various sections of the machine operation. The mill was able to bypass one double disc refiner (DDR) when the furnish was changed to 60%unbleached bamboo kraft pulp (long fraction) and 40% NDLKC for producing normal ESKP. This reduced the energy requirement by about 54 kWh/metric ton of pulp, with an 8% savings in steam consumption per ton of paper. The mill was able to produce high strength paper having high porosity without sacrificing other strength properties. Trials with the same enzyme in a mill producing mainly coated white paper showed a reduction in refining energy of about 70 kWh/metric ton of softwood pulp and 30 kWh/metric ton of hardwood pulp. Steam consumption on the paper machine was reduced by approximately 0.5 ton steam/metric ton of paper. By using enzymes, the mill eliminated a refining bottleneck in its softwood line and increased production by 12%. The strength properties of the pulps were not affected. In a mill producing heavy base papers, enzyme use enabled the mill to bypass one 180 kW triple disc refiner (TDR). Pulp strength and other properties were within the specified limits and comparable to those of the control. All these mills have started using enzyme on regular basis.

Journal articles
Open Access
Effect of PCC filler on dewatering of fiber suspension

Effect of PCC filler on dewatering of fiber suspension, TAPPI JOURNAL, November 2006

Journal articles
Open Access
Influence of wet-end variables on the sizing efficiency of ASA on fine papers produced with Eucalyptus globulus kraft pulps

Influence of wet-end variables on the sizing efficiency of ASA on fine papers produced with Eucalyptus globulus kraft pulps

Journal articles
Subscription Access
Calculations relating to web buckling resulting from roller

Calculations relating to web buckling resulting from roller misalignment, TAPPI JOURNAL

Journal articles
Open Access
The influence of pigment particle shape on the in-plane tensile strength properties of kaolin-based coating layers, TAPPI JOURNAL

The influence of pigment particle shape on the in-plane tensile strength properties of kaolin-based coating layers, TAPPI JOURNAL

Journal articles
Open Access
Profiling the wood and pulping properties of southern pine thinning resources, TAPPI JOURNAL & Solutions! January 2005

Profiling the wood and pulping properties of southern pine thinning resources, TAPPI JOURNAL & Solutions! January 2005

Journal articles
Open Access
Improvement of paper properties using starch-modified precipitated calcium carbonate filler, TAPPI JOURNAL & Solutions! February 2005, Vol. 4(2) (304KB)

Improvement of paper properties using starch-modified precipitated calcium carbonate filler, TAPPI JOURNAL & Solutions! February 2005, Vol. 4(2) (304KB)

Journal articles
Reliability and Maintenance: Management: What Comes First? SOLUTIONS May 2005 [05MARSO08.pdf]

What Comes First?, Solutions!, March 2005, Vol. 88(3) (46KB)

Journal articles
Open Access
Prediction of dust composition and amount in kraft recovery boilers, TAPPI JOURNAL & Solutions! March 2005, Vol. 4(3)

Prediction of dust composition and amount in kraft recovery boilers, TAPPI JOURNAL & Solutions! March 2005, Vol. 4(3)

Journal articles
Subscription Access
Characterizing refining action in PFI mills, TAPPI JOURNAL & Solutions! March 2005, Vol. 4(3)

Characterizing refining action in PFI mills, TAPPI JOURNAL & Solutions! March 2005, Vol. 4(3)

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