By Mohamed Naceur Belgacem, Antonio Pizzi
This publication will specialise in lignocellulosic fibres as a uncooked fabric for numerous purposes. it's going to commence with wooden chemistry and morphology. Then, a few fibre isolation procedures can be given, prior to relocating to composites, panel and paper production, characterization and aging.
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Extra info for Lignocellulosic fibers and wood handbook: renewable materials for today’s environment
Sample text
6 Swelling of Dry Wood in Water Theoretically, it is possible to have absolutely dry wood. That is wood with a zero moisture content. In actual fact, wood with zero moisture content has never been achieved. When we talk about "oven dry" (dried above 100 °C) wood, the actual moisture content is less than one percent but not zero. 11 There is a small amount of water that is so tightly bound to wood that it is impossible to remove. Because of this, there is no such thing as the volume of zero moisture content wood.
The difference between these curves is referred to as Sorption Hysteresis for wood [11]. Understanding of the difference in moisture content from wet to dry and from dry to wet is very important when it comes to mechanical properties of wood that will be discussed later. 9 depending on the relative humidity and wood species [12]. 3 Equilibrium moisture content of pine and aspen. 4 Sorption isotherm for wood. 13%, while the same wood going from dry to wet would have a moisture content of approximately 10%.
10 Cell Wall Elastic Limit The orientation of the cell wall polymers in the Si layer determines the extent of swelling of wood in water or other solvent. Swelling from the dry state to the water saturation state continues until the cross banding of the cell wall polymers in the Si layer restricts further swelling. This point is defined as the elastic limit of the cell wall. In many cases, data on swelling in solvents other than water, is given relative to the swelling in water so that the value of water is set at value of 1, 10 or 100 and all other solvents are reported above or below this value.