Effect of refining on the structural integrity of wood fibers

Groom Les, . and Yan Yu, . and Chi-Leung S., . and Elder Thomas, . and Pesacreta Thomas, . (2006) Effect of refining on the structural integrity of wood fibers. [Proceedings Paper]

Medium-density fiberboard MDF is on an upward growth trend that is expected to increase by 60 percent over the next 8 years. The conflicting nature of increased demand with a supply that is lower in density and higher in juvenility will soon pose problems especially with regards to structural performance. Engineering shortcomings caused by raw materials can be overcome by increasing fiber-to-fiber stress transfer within the composite. These stress transfers are accomplished by the addition of a resin most commonlyurea-formaldehyde that coats the wood fiber surfaces and in some cases penetrates into the cell wall lumens. This paper will examine the surface properties of loblolly pine fibers refined at varoius pressures. The wood examined consists of both juvenile wood pith to 8th growth ring and mature wood growth ring 25 and beyond.Scanning electron micrographs will be presented that were analyzed with traditional image analysis. The objectives of the study are to evaluate 1the structural damage to the fiber cell wall and 2 the inter- and intrawall cracks that allow resin to penetrate into the cell wall and into the wall lumen. The images will also be compared to earlier data showing the mechanical properties of these wood fibers. Confocal microscopy analyses will also be presented to demonstrate the relationships between cell wall cracks and resin penetration.

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Abstract

Medium-density fiberboard MDF is on an upward growth trend that is expected to increase by 60 percent over the next 8 years. The conflicting nature of increased demand with a supply that is lower in density and higher in juvenility will soon pose problems especially with regards to structural performance. Engineering shortcomings caused by raw materials can be overcome by increasing fiber-to-fiber stress transfer within the composite. These stress transfers are accomplished by the addition of a resin most commonlyurea-formaldehyde that coats the wood fiber surfaces and in some cases penetrates into the cell wall lumens. This paper will examine the surface properties of loblolly pine fibers refined at varoius pressures. The wood examined consists of both juvenile wood pith to 8th growth ring and mature wood growth ring 25 and beyond.Scanning electron micrographs will be presented that were analyzed with traditional image analysis. The objectives of the study are to evaluate 1the structural damage to the fiber cell wall and 2 the inter- and intrawall cracks that allow resin to penetrate into the cell wall and into the wall lumen. The images will also be compared to earlier data showing the mechanical properties of these wood fibers. Confocal microscopy analyses will also be presented to demonstrate the relationships between cell wall cracks and resin penetration.

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Item Type:	Proceedings Paper
AGROVOC Term:	WOOD
AGROVOC Term:	FIBRES
AGROVOC Term:	FIBREBOARDS
AGROVOC Term:	PURIFICATION
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:28
URI:	http://webagris.upm.edu.my/id/eprint/16931

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