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The mechanism of rupture of early- a...

Huang, Fang.

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The mechanism of rupture of early- and latewood in refining.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The mechanism of rupture of early- and latewood in refining./
作者:	Huang, Fang.
面頁冊數:	201 p.
附註:	Source: Dissertation Abstracts International, Volume: 67-08, Section: B, page: 4182.
Contained By:	Dissertation Abstracts International67-08B.
標題:	Agriculture, Wood Technology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR17594
ISBN:	9780494175941

The mechanism of rupture of early- and latewood in refining.
Huang, Fang.

The mechanism of rupture of early- and latewood in refining. - 201 p.

Source: Dissertation Abstracts International, Volume: 67-08, Section: B, page: 4182.

Thesis (Ph.D.)--Universite du Quebec a Trois-Rivieres (Canada), 2006.

The most distinguishable variability in fibre morphology of softwood grown in temperate zone exists between earlywood (EW) and latewood (LW), especially in fibre length, cell wall thickness, cross-section dimension, and pit size. Generally, LW fibres are longer, have thicker cell wall and smaller radial width than EW fibres. EW fibres have more pits and their pits surfaces are larger than those of LW. Because of these morphological differences, the EW and LW breakdown dissimilarly during refining in terms of cell wall rupture modes (trans-wall, intra-wall failures), cell wall thickness reduction, fibre shortening, fibre wall splitting, fibrillation, collapsibility and other physical changes.

ISBN: 9780494175941Subjects--Topical Terms:

1031154
Agriculture, Wood Technology.

The mechanism of rupture of early- and latewood in refining.
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245 1 4 $a The mechanism of rupture of early- and latewood in refining.
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500 $a Source: Dissertation Abstracts International, Volume: 67-08, Section: B, page: 4182.
502 $a Thesis (Ph.D.)--Universite du Quebec a Trois-Rivieres (Canada), 2006.
520 $a The most distinguishable variability in fibre morphology of softwood grown in temperate zone exists between earlywood (EW) and latewood (LW), especially in fibre length, cell wall thickness, cross-section dimension, and pit size. Generally, LW fibres are longer, have thicker cell wall and smaller radial width than EW fibres. EW fibres have more pits and their pits surfaces are larger than those of LW. Because of these morphological differences, the EW and LW breakdown dissimilarly during refining in terms of cell wall rupture modes (trans-wall, intra-wall failures), cell wall thickness reduction, fibre shortening, fibre wall splitting, fibrillation, collapsibility and other physical changes.
520 $a The principal objective of this research project is to study the breakdown mechanism of Jack pine (Pinus banksiana) EW and LW in thermomechanical pulping (TMP) by means of microscopic observations. Characteristics such as fibre splitting, shortening, delamination (internal fibrillation) and external fibrillation, etc. are evaluated. Physical changes in the EW and LW fibres are qualified and quantified with the aide of light microscopy as well as scanning electron microscopy. The impacts of the observed changes on pulp and paper properties are assessed to establish possible interrelation between the fibre characteristics and paper properties.
520 $a In this study, the Jack pine EW and LW chips were firstly separated manually using a chisel. Then, the EW and LW chips were either separately refined or in blend according to the initial proportion of each existing in the wood. The refining was carried out in two stages: pressurized primary stage and atmospheric secondary stage. The pressurized stage was conducted at two temperatures: 120°C and 160°C. Owing to the high refining pressure, the refiner plate clearance at 160°C had to be reduced to half of that at 120°C. Finally, handsheets were made from different pulps which were produced in separate refining of EW, LW and EW/LW mixed furnish. Other furnishes employed include fines-free pulps and pulps of different Bauer-McNett fractions or in combination. We also compared the differences in papermaking properties between "Chip Mixing" in co-refining of EW and LW chips and "Pulp Mixing" or post-refining mixing of separately refined EW and LW pulps. The physical and optical characteristics of all these handsheets were analysed. (Abstract shortened by UMI.)
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791 $a Ph.D.
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