Manufacture of dressed lumber from Siberian softwood, 4: Application of dehumidification drying for manufacturing of door sill and door head
1989
Shimazaki, T.(Toyama-ken. Forestry and Forest Products Research Center, Imizu (Japan)) | Takeda, K. | Yoshida, N.
In order to examine the application of dehumidification drying (D.D.) on manufacture of dressed lumber such as door sill, door head and so on, each Siberian softwood dimension lumber dried by simple D.D. (average moisture content 18% after drying) and conventional kiln drying (K.D., average moisture content 15% after drying) was manufactured to door sill and door head. Then after 60-day storage, the change of moisture content and warpage of the dried lumbers were compared between D.D. and K.D. The results were summarized as follows: 1) On the simultaneous planning of lumber's (cross section size 40 x 100mm) four faces by moulder, cup before planning affected the rate of unplaned area on the wide two faces, and there was not a significant difference between the methods of drying (D.D. and K.D.). 2) After 60-day storage, the change of bow, crook and twist of the dimension lumbers dried by D.D. was compared with that dried by K.D. on the basis of practical criteria, and there was not a significant difference between the both drying methods. But it was obvious that the application of D.D. for manufacturing of dressed lumber was not suitable for specific species such as Siberian larch which moisture content after drying was in the wide ranges, because coefficient of shrinkage at the thickness (radial direction), width (tangential direction) and width of groove became larger with the decrease of moisture content during storage.
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