Canadian wood products industries . ms a fan is used tocirculate the air in the kiln. This, of course, pre-supposes a charge kiln and is not very suitable for aprogressive type of kiln, as the fan, in drawing theair from the lumber, mixes the air of high humiditywith thai from the dry end and of low humidity andin discharging the air again to the lumber does soat a uniform degree of saturation, making the wet endtoo dry, or the dry end too wet for good also entails the first cost of motors or engines todrive the fans, together with their belts, bearings,etc., and the maintenance o
Canadian wood products industries . ms a fan is used tocirculate the air in the kiln. This, of course, pre-supposes a charge kiln and is not very suitable for aprogressive type of kiln, as the fan, in drawing theair from the lumber, mixes the air of high humiditywith thai from the dry end and of low humidity andin discharging the air again to the lumber does soat a uniform degree of saturation, making the wet endtoo dry, or the dry end too wet for good also entails the first cost of motors or engines todrive the fans, together with their belts, bearings,etc., and the maintenance of same. Rearrangement of Kiln Kilns can be arranged, however, that will take thefullest advantage of the natural tendency of hot airto rise and in which the steam necessary to maintainproper humidity is utilized to augment the naturalcirculation. The writer has made several changes inthe Standard kilns with a view to increasing theircapacity. At the present time we are using the sys-tem shown in Fig. 2, piling the lumber on the car. Fig. 3—The old and new piling methods being the most important feature of the whole. Themiddle coil D, Fig. 1, has been done away with andin this case hot air rises as there is nothing to reducethe temperature of the air until it enters the layersof boards and we have the same temperature at thetop of the load in the inverted V at c, as we have atthe opening of the V at c. The steam jets shown at P consist of a 1/4 pipe,which extends from the door at the wet end to withinten feet of the dry end. This pipe is perforated every14 by a 1/16 hole and a pressure of about 40 maintained on this pipe. The movement given tothe column of air in the V is considerable. If theedges of the pile in the V are straight, as shown inthe photo, the large amount of hot air entering at thebottom of the V is distributed evenly over eachlayer of boards; thus the top, middle and bottom partsof the load are drying uniformly. Notice also that theair has only to pass o
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfurnitu, bookyear1922
