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By Milton
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Additional info for The Preservation of Wood A Self Study Manual for Wood Treaters
Example text
The full cell (or Bethell) process is used for most of the pressure treatments using chromated copper arsenate (CCA) and pentachlorophenol-based (PCP) preservatives, and a good proportion of the treatments with creosotes. Features of the full cell process include: It gives the deepest possible penetration and the highest loadings (retentions) of preservative with easily-treated species. Virtually all of the air in the wood cells can be replaced with preservative. Sometimes this may produce a higher loading than necessary.
Second in terms of economic importance among wood-destroying insects are powderpost beetles, which produce the so-called powderpost damage in wood. Powderpost beetles attack both hardwoods and softwoods, both freshly cut and seasoned lumber and timbers, and use the wood for both food and shelter. Within the irregularly-shaped burrows made by the beetles undigested particles of wood in the form of a very fine powder, or frass, are left. Hence the name powderpost beetle. The most important and destructive species of powderpost beetles are Lyctus beetles (see Figure 33).
Rays can pass some oil to adjoining fibers, although the majority of fibers could remain dry. Although quite a lot of oil may have been absorbed by the hardwood cubes, mainly in the vessels and ray cells, significant internal areas of the block (fiber areas) may have little or no oil. From a preservation standpoint, The Preservation of Wood there is a lot of unprotected cellulose and lignin in these fibers that is liable to decay. What is worse, as Lesson 1 pointed out, the principal strength of hardwoods comes from these unprotected fibers.