DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 3-4/1951 str. 36 <-- 36 --> PDF |
THE YIELD OF BEECHWOOD ROTARY LOGS The author discusses albout the yield of beechwood rotary logs in production of plywood. The yield of beechwood rotary logs s 38 do 42%, average 40%. The wastes average: on the rotary lathe 29%, clipper 10%, roller veneer dryer 6%, sizing clipper 4%, circular saws 4°/o, 3-drum sander 5%. The wastes are of these sorts: wet and dry veneer 22,7%, central cylinders 17,4%, small pieces of the veneer 2,3%, narrow pieces of the plywood 3,2%, woodflour and saw-dust 3,8%, scarping 1,7%, the loss of the drying veneers 6,2%, All this percentage are from the volume of the log without the bark. The author discusses the influence of curvature of log, excis´on of the knots, defects inside the log, elliptical cross cut and eccentricity position of the log im the rotary lathe and gives the formulas, for yield and wastes. If the length of logs is 230 cm, diameter 30 100 cm and if ´t is curved from 1 to 4 cm in height from the arch, the wastes are´ from \2 100 cm, the percentage of wastes is from 0,8 to 7%.. It the difference between diameters of the logs is from 1 to 10 cm, when they have the lenght 230 cm and diameters from-30 to 100 cm the percentage of eccentric veneer is from il to 33%. . The eccentricity of the log in the rotary lathe diminishes the yield in greater quantity, but eccentricity can be removed with attentive woric. The author discusses about the use of the wastes. .... ....... .... (.......) : ............. ........... . ...... ........... ...... ....... ........... .......... . ......... ....... ........^.. y HP ....... ... ..... je ..... .. (.... ..... ........, .... .. ........ ..... ........ ............, .........., .............´ . ...... ......> ...., TaKio . .. ........ ..^....... ..../..... ..:.....; ..» ... ..., ... ce .. .... .. .... ..........: .... .... [.^....... .... ... ... ..... y ...... »...... ..........5 .... ............ .... ........« .. .. ....... .... ........... .6.1.......1.. ....... 1938—1940 .... »a »......... ...... ....... . ...... ......, ... ....... ......—.......—......« (.. ......). ......... ...... .... .... ..........., ........... . ..- Maipa, ..... je ma .... ......... Ha ...... ....... ...........1: ............ ......., ..... ......., ...... ......., ...... ...... . .... ........ .., a ..... <. ........ ...1.......... ......... .... ............ .. ..... .......... ............ ......, .............» .....© ..... da ......... ... 8000 ....... je ..... .. ..... ...!.1.... .. .... .. ...... ............. .........., .......... ...... ............. . «.......» .......... ......... ........ ....... ´ .........« ..... y ........ .. ......... .......... y ...... ........... je ... ........... ... ............ ..... ... ..... .......... . ..... ........... . .... «. ........... . ......... ......... . ........... .... fteceua 1947 .... oôadjesHO je . ........ 2/. ........ ... ce ...... ... ....... .... 1948 .... 142 |