Recycling potential of unbleached and bleached chemical pulps from juvenile and mature wood of Populus deltoides
-
Yahya Hamzeh
,
Seyed Mohammad Hashemi Najafi
Abstract
The recycling potential of unbleached and bleached pulps of juvenile and mature wood of poplar (namely “eastern cottonwood”, Populus deltoides) has been investigated. First, chemical and morphological characteristics of juvenile wood (JW), transition wood, and mature wood (MW) of the trunk were determined. Then, high yield and low yield pulps were produced separately from JW and MW by kraft pulping (KP), followed by bleaching of the low-yield pulp with a DED sequence. The obtained handsheet papers were subjected to five successive drying and rewetting cycles (as recycling simulation), and the properties of the corresponding pulps were characterized. The results show that JW is inferior with respect to chemical and morphological properties and resulted in low-yield KP. The bleached pulp obtained from JW required more bleaching chemical to achieve the brightness targets. The strength losses of pulps resulting from recycling were more significant in the first recycling cycle, and then the loss rate decreased with further cycles. The comparison between different pulps showed that the JW pulps were more susceptible to the effects of recycling than MW pulps.
©2012 by Walter de Gruyter Berlin Boston
Artikel in diesem Heft
- Original Papers
- Oxidative stabilisation of kraft lignin for carbon fibre production
- Antithrombotic properties of sulfated wood-derived galactoglucomannans
- Recycling potential of unbleached and bleached chemical pulps from juvenile and mature wood of Populus deltoides
- Natural and artificial ageing of spruce wood as observed by FTIR-ATR and UVRR spectroscopy
- Characterization of phenolic compounds from inner bark of Betula pendula
- Identification and functional characterization of a sesquiterpene synthase gene from Eleutherococcus trifoliatus
- Microstructure and stiffness of Scots pine (Pinus sylvestris L) sapwood degraded by Gloeophyllum trabeum and Trametes versicolor – Part I: Changes in chemical composition, density and equilibrium moisture content
- Changes in microstructure and stiffness of Scots pine (Pinus sylvestris L) sapwood degraded by Gloeophyllum trabeum and Trametes versicolor – Part II: Anisotropic stiffness properties
- Off-axis Young’s modulus and off-axis shear modulus of wood measured by flexural vibration tests
- Empirical models for radial and tangential fibre width in tree rings of Norway spruce in north-western Europe
- Automatic grain texture analysis using integral transforms
- The fungal resistance of wood modified with glutaraldehyde
- Relative fungal efficacy results from the soil block test with a long incubation period of three commercial copper wood preservatives
- Uneven distribution of preservative in kiln-dried sapwood lumber of Scots pine: Impact of wood structure and resin allocation
- Utilization of surfactants for consolidation of wooden work of art
- Screening for xylanase and β-xylosidase production from wood-inhabiting Penicillium strains for potential use in biotechnological applications
- Short Note
- Furfuryl alcohol impregnation for improved plasticization and fixation during the densification of wood
- Meetings
- Meetings
Artikel in diesem Heft
- Original Papers
- Oxidative stabilisation of kraft lignin for carbon fibre production
- Antithrombotic properties of sulfated wood-derived galactoglucomannans
- Recycling potential of unbleached and bleached chemical pulps from juvenile and mature wood of Populus deltoides
- Natural and artificial ageing of spruce wood as observed by FTIR-ATR and UVRR spectroscopy
- Characterization of phenolic compounds from inner bark of Betula pendula
- Identification and functional characterization of a sesquiterpene synthase gene from Eleutherococcus trifoliatus
- Microstructure and stiffness of Scots pine (Pinus sylvestris L) sapwood degraded by Gloeophyllum trabeum and Trametes versicolor – Part I: Changes in chemical composition, density and equilibrium moisture content
- Changes in microstructure and stiffness of Scots pine (Pinus sylvestris L) sapwood degraded by Gloeophyllum trabeum and Trametes versicolor – Part II: Anisotropic stiffness properties
- Off-axis Young’s modulus and off-axis shear modulus of wood measured by flexural vibration tests
- Empirical models for radial and tangential fibre width in tree rings of Norway spruce in north-western Europe
- Automatic grain texture analysis using integral transforms
- The fungal resistance of wood modified with glutaraldehyde
- Relative fungal efficacy results from the soil block test with a long incubation period of three commercial copper wood preservatives
- Uneven distribution of preservative in kiln-dried sapwood lumber of Scots pine: Impact of wood structure and resin allocation
- Utilization of surfactants for consolidation of wooden work of art
- Screening for xylanase and β-xylosidase production from wood-inhabiting Penicillium strains for potential use in biotechnological applications
- Short Note
- Furfuryl alcohol impregnation for improved plasticization and fixation during the densification of wood
- Meetings
- Meetings
