subject: New Vacuum Dryer Can Help You Save More Drying Time [print this page] In particular, according to the invention, one secondary effect of the evacuating action will be directed advantageously to providing protection against the defects of warping and deformation of the timber, which are accepted as inevitable in any type of artificial drying just as they are in the natural process (seasoning), albeit to a lesser extent in the latter. Another object of the present invention is to provide a vacuum dryer in which the rate of drying is increased as a consequence of a secondary action of the vacuum which is suitably controlled according to the invention.
Furthermore, in the continuous vacuum dryer drying process of the invention, in which the heating and the vacuum act simultaneously, the pressure favours intimate contact between the flat heating elements and the wooden planks whereby the transmission of heat to the timber is considerably facilitated with the favourable result of accelerating the heating of the timber and hence, by definition, increasing the rate of drying. At the same time, heat losses to the exterior are reduced both because the heat is induced to pass more easily into the timber by the intimate contact with the flat heating elements and because of the shorter drying time.
It should be noted that this average hourly loss, which is so considerable, cannot even be achieved with conventional dryers at temperatures as high as 180 C. The explanation for this phenomenon lies in the fact that the timber in the vacuum dryer according to the invention is squeezed as a result of the compression which produces a synergic effect in combination with the vacuum action: but we will return to this effect below.
by: ericfu
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