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Thermomechanical pulping (TMP), chemithermomechanical pulping (CTMP) and biothermomechanical pulping (BTMP) of bugweed (Solanum mauritianum) and Pinus Patula
Thesis (MSc (Forest and Wood Science))—University of Stellenbosch, 2005.
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| Format: | Thesis |
| Language: | English |
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Stellenbosch : University of Stellenbosch
2008
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| _version_ | 1867614029458964480 |
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| access_status_str | Open Access |
| author | Vena, P. F. |
| author2 | Gerischer, G. F. R. |
| author_browse | Gerischer, G. F. R. Vena, P. F. |
| author_facet | Gerischer, G. F. R. Vena, P. F. |
| author_sort | Vena, P. F. |
| collection | Thesis |
| dc_rights_str_mv | University of Stellenbosch |
| description | Thesis (MSc (Forest and Wood Science))—University of Stellenbosch, 2005. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/3055 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:45:32.686Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2008 |
| publishDateRange | 2008 |
| publishDateSort | 2008 |
| publisher | Stellenbosch : University of Stellenbosch |
| publisherStr | Stellenbosch : University of Stellenbosch |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/3055 Thermomechanical pulping (TMP), chemithermomechanical pulping (CTMP) and biothermomechanical pulping (BTMP) of bugweed (Solanum mauritianum) and Pinus Patula Vena, P. F. Gerischer, G. F. R. Rypstra, T. Dommisse, E. J. Mechanical pulping process Pinus patula -- Usage Solanaceae -- Usage Dissertations -- Wood science Theses -- Wood science Thesis (MSc (Forest and Wood Science))—University of Stellenbosch, 2005. In this study the mechanical pulping characteristics of Solanum mauritianum (Bugweed) were investigated using Thermomechanical (TMP), Chemithermomechanical (CTMP) and Biothermomechanical (BTMP) methods. Results were compared with those obtained from Pinus patula pulps treated under similar conditions. In the TMP pulping trials, the pretreatment of wood chips involved soaking of chips in water overnight prior to refining. The CTMP pulping trials involved first the impregnation of wood chips with 3% sodium sulfite and 2% sodium carbonate solution for 24 hours before refining. Coculture of hemicellulolytic Aspergillus flavipes and ligninolytic Pycnoporus sanguineus were inoculated to the wood chips in BTMP trials, to enhance wood chip breakdown. Solanum mauritianum (Bugweed) wood chips produced the highest pulp yields and less shive content compared to Pinus patula treated under similar pulping conditions. This could be ascribed to easier fibre separation and lesser fibre damage, as well as its lower extractive content. Results showed that the pretreatment of wood chips prior to TMP pulping increased paper strength properties compared to the pulp prepared from the untreated wood chips. Chemically pretreated wood chips consumed a larger amount of refining energy. With regard to brightness levels, handsheets from Pinus patula pulps recorded lower brightness values than those from Bugweed pulps. This was related to the lighter colour of the Bugweed wood chips and the higher extractive content of Pinus patula. The high brightness level of the CTMP pulps could be attributed to a modification of the lignin chromophores and the extractive removal, which contributed to a lower absorption coefficient of the pulp. Handsheets from BTMP pulps showed a reduction in brightness compared to the TMP and CTMP pulps. This was caused by the darkening of the wood chips during the fungal incubation period. Pulp and paper properties of Bugweed compared favourably to those results published for other hardwoods. The results of this study suggest possibilities for using Bugweed in high yield pulping processes. Masters 2008-08-06T10:47:57Z 2010-06-01T09:05:07Z 2008-08-06T10:47:57Z 2010-06-01T09:05:07Z 2005-12 Thesis http://hdl.handle.net/10019.1/3055 en University of Stellenbosch application/pdf Stellenbosch : University of Stellenbosch |
| spellingShingle | Mechanical pulping process Pinus patula -- Usage Solanaceae -- Usage Dissertations -- Wood science Theses -- Wood science Vena, P. F. Thermomechanical pulping (TMP), chemithermomechanical pulping (CTMP) and biothermomechanical pulping (BTMP) of bugweed (Solanum mauritianum) and Pinus Patula |
| title | Thermomechanical pulping (TMP), chemithermomechanical pulping (CTMP) and biothermomechanical pulping (BTMP) of bugweed (Solanum mauritianum) and Pinus Patula |
| title_full | Thermomechanical pulping (TMP), chemithermomechanical pulping (CTMP) and biothermomechanical pulping (BTMP) of bugweed (Solanum mauritianum) and Pinus Patula |
| title_fullStr | Thermomechanical pulping (TMP), chemithermomechanical pulping (CTMP) and biothermomechanical pulping (BTMP) of bugweed (Solanum mauritianum) and Pinus Patula |
| title_full_unstemmed | Thermomechanical pulping (TMP), chemithermomechanical pulping (CTMP) and biothermomechanical pulping (BTMP) of bugweed (Solanum mauritianum) and Pinus Patula |
| title_short | Thermomechanical pulping (TMP), chemithermomechanical pulping (CTMP) and biothermomechanical pulping (BTMP) of bugweed (Solanum mauritianum) and Pinus Patula |
| title_sort | thermomechanical pulping tmp chemithermomechanical pulping ctmp and biothermomechanical pulping btmp of bugweed solanum mauritianum and pinus patula |
| topic | Mechanical pulping process Pinus patula -- Usage Solanaceae -- Usage Dissertations -- Wood science Theses -- Wood science |
| url | http://hdl.handle.net/10019.1/3055 |
| work_keys_str_mv | AT venapf thermomechanicalpulpingtmpchemithermomechanicalpulpingctmpandbiothermomechanicalpulpingbtmpofbugweedsolanummauritianumandpinuspatula |