Effect of bark content in mixed hardwood chips on pulp and papermaking properties
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Sandeep Kumar Tripathi
,
Izhar Alam
Abstract
Effect of different proportions of bark in mixed hardwood (about 70 % eucalyptus and 30 % poplar) chips on pulp and papermaking properties was studied. Increased proportion of bark in raw material chips resulted in increased active alkali consumption, increased reject content in pulp and reduced pulp yield after kraft pulping. The unbleached pulp obtained with higher proportion of bark in mixed hardwood chips also has higher kappa number, lower brightness and viscosity as compared to pulp obtained with bark free mixed hardwood chips. The soda loss and ash content in pulp were severely increased from 12.8 kg/t to 312 kg/t of pulp and 0.7 % to 21.1 %, respectively with the increase of bark portion from 0 to 100 % in raw material furnish. The physical strength properties like tensile, burst and tear indices in the pulp obtained from bark were reduced by 58.5 %, 60.7 % and 68.4 %, respectively as compared to that with bark free mixed hardwood.
Funding statement: Authors state no funding involved.
Conflict of interest: The authors declare no conflicts of interest.
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© 2020 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Chemical pulping
- Feasibility of removal S−2 from Kraft black liquor recovery cycle with synthetic adsorbents (Cu-PAC and Cu-GAC)
- Effect of bark content in mixed hardwood chips on pulp and papermaking properties
- Process modifications to obtain a prehydrolysis kraft dissolving pulp with low limiting pulp viscosity
- Bleaching
- Synthesis of chlorine dioxide stable solution by combined reduction and its decomposition kinetics
- Paper physics
- Elastic-plastic model for the mechanical properties of paperboard as a function of moisture
- Evaluating the use of a tactile sensor for measuring carton compliance
- Paper chemistry
- Determination of hydrophobic degree of paper packaging materials by a tracer-assisted headspace gas chromatography
- Jet-cooked papermaking starches studied using 1H NMR-relaxometry and viscometry
- Enhanced separation of cellulose from bamboo with a combined process of steam explosion pretreatment and alkaline-oxidative cooking
- Improving mechanical properties of recycled paper via surface spraying carboxymethyl starch-grafted-polyacrylamide
- Coating
- The influence of coating composition on the structural and functional properties of coated paper for packaging applications
- Coating factors influencing the fold cracking of coated papers
- The effect of zeolite on inkjet coated paper surface properties and deinking
- Printing
- Exploitation influence on compressible polyurethane flexographic sleeve properties
- Environmental impact
- Effects of pH shock on microaerobic activated sludge system with a graphene oxide/nano-magnetic powder composite
- Experimental study on filtering papermaking black liquor by dynamic blade crossflow membrane
- Partial circuit closure of filtrate in an ECF bleaching plant
- Nanotechnology
- Paperboard as a substrate for biocompatible slippery liquid-infused porous surfaces
Articles in the same Issue
- Frontmatter
- Chemical pulping
- Feasibility of removal S−2 from Kraft black liquor recovery cycle with synthetic adsorbents (Cu-PAC and Cu-GAC)
- Effect of bark content in mixed hardwood chips on pulp and papermaking properties
- Process modifications to obtain a prehydrolysis kraft dissolving pulp with low limiting pulp viscosity
- Bleaching
- Synthesis of chlorine dioxide stable solution by combined reduction and its decomposition kinetics
- Paper physics
- Elastic-plastic model for the mechanical properties of paperboard as a function of moisture
- Evaluating the use of a tactile sensor for measuring carton compliance
- Paper chemistry
- Determination of hydrophobic degree of paper packaging materials by a tracer-assisted headspace gas chromatography
- Jet-cooked papermaking starches studied using 1H NMR-relaxometry and viscometry
- Enhanced separation of cellulose from bamboo with a combined process of steam explosion pretreatment and alkaline-oxidative cooking
- Improving mechanical properties of recycled paper via surface spraying carboxymethyl starch-grafted-polyacrylamide
- Coating
- The influence of coating composition on the structural and functional properties of coated paper for packaging applications
- Coating factors influencing the fold cracking of coated papers
- The effect of zeolite on inkjet coated paper surface properties and deinking
- Printing
- Exploitation influence on compressible polyurethane flexographic sleeve properties
- Environmental impact
- Effects of pH shock on microaerobic activated sludge system with a graphene oxide/nano-magnetic powder composite
- Experimental study on filtering papermaking black liquor by dynamic blade crossflow membrane
- Partial circuit closure of filtrate in an ECF bleaching plant
- Nanotechnology
- Paperboard as a substrate for biocompatible slippery liquid-infused porous surfaces
