The Kiln Drying of Lumber; A Practical and Theoretical Treatise
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ...through the evaporation it will take on more moisture; consequently, the internal portions of the pile must necessarily lag behind the surface in the rate of drying. Herein is where many designs of dry kilns and drying methods have failed. To dry only a few pieces of wood is a totally different proposition from drying a pile of lumber. What can be accomplished in the case of a small test is often impossible when it comes to a large quantity, owing to the inability of obtaining the conditions in the inside of the pile, which are present in the small test. Furthermore, it should be clearly understood that the size of the pile of lumber which can be placed in a kiln is no criterion of the efficiency of the kiln for drying the lumber, in fact, it is more often true that the larger the pile, and the more tightly packed the kiln room, the less efficient is the apparatus. It is not the capacity of the room and the economy of space which should be considered primarily, but the principles upon which the drying depends. Eemember always that a dry kiln is a machine for drying lumber just as much as a veneer drier is a machine for drying the thin plates of wood, and it is not a storage warehouse where economy of space and handling are of the first importance. In considering the manner in which the air enters the pile of lumber, there are in general three cases for discussion. First, where the air enters and leaves irregularly at numerous points, a sort of diffusion process. This is what occurs in a loose, flat pile of airdried lumber when placed in a room with heating coils beneath and no specific form of circulation. This is the slowest system of drying and great variations in temperature and humidity are found to occur at different portions of the...
- 189 x 246 x 3mm | 132g
- 01 Apr 2013
- Miami Fl, United States
- black & white illustrations