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greenknifes
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MessagePosté le: Ven 22 Sep - 08:17 (2017)    Sujet du message: A commercial modification of the steaming hot-water Répondre en citant

MacLean was using steam at Pressure Bar, while Feihl used a steam-air mix at a temperature generally below 200° F (93° C). 40 Some commercial plants inject steam into a vat and at the same time spray hot water over the bolts or flitches. In addition to adding heat to the wood, the hot water spray prevents drying and checking.
A commercial modification of the steaming hot-water spray method is to blow steam through an alkaline water solution. Salts added to water will raise the boiling point slightly. These few degrees change in temperature would not seem to be important for conditioning veneer logs. This would appear to be mildly alkaline because.we know strong alkali solutions will break down wood structure.
However, in typical heating cycles, the alkali would not penetrate more than a fraction of an inch in most wood species. Effect of Differences in Moisture Content and Specific Gravity MacLean H6) found wood that is well below 30 percent moisture content heats more slowly than green wood, but differences in moisture content above about 30 percent had no important effect on the rate of heating.
All veneer cutting, of course, is done with wood at a moisture content of 30 percent or higher. For practical purposes, MacLean is suggesting that green wood of any given species will heat at about the same rate at any moisture content above 30 percent. In contrast, he found that the rate of heating of wood varied inversely with the specific gravity {J^6), Although the heat conductivity of wood increases with the increase in specific gravity, the diffusivity (a measure of the rate of temperature change) decreases as specific gravity increases.


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MessagePosté le: Ven 22 Sep - 08:17 (2017)    Sujet du message: Publicité

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