DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 9-10/1965 str. 59 <-- 59 --> PDF |
the production of a definite commodity is established, and so we commenced to survey only the basic-technological working time on primary machines of the plant which will serve us, as already stressed, as a safe basis and as a key for the distribution of the general expenses of the production. plan diameter sub-classes of Silver Fir (Abies alba Mill.). The data of the survey were processed statistically. On the basis of these investigations we can conclude as follows: — the basic-technological working time necessary for the conversion of individual sawiogs issued from different working-plan diameter sub-classes increases according to the function of a parabola (y = 777.358237 — 17.076138 x -t- 0.229489 x2) towards the higher diameter sub-classes.; — the mean volumes of sawiogs from the individual working-plan diameter subclasses also increase according to the function of a parabola (y = — 0.185972 + + 0.012705 x — 0.000000128 x2) towards the higher diameter sub-classes, although they can also be calculated, a svisible in Fig. 2., according to the equation for a straight line (y = a + bx); — the basic-technological working time necessary for the conversion of 1 cu.m. Fir sawiogs on primary machines of the plant (band saw and frome saws) is greatest in the diameter sub-class of 22.5 cm. From this diameter sub-class upwards it has a tendency to decrease to a diameter sub-class of 62.5 cm., where it is smallest, again to decrease slowly towards the higher diameter sub-classes; — the cost price for the normal edged timber produced from 1 cu.m. of Fir sawiogs according to the working-plan diameter sub-classes is a function of the basic- technological working time on primary machines of the plant, which is necessary to saw 1 cu.m. of Fir sawiogs on these machines. The cost price is greatest in the diameter sub-class of 22.5 cm and amounts to 34,023 din./cu.m., whereafter it has a tendency to decrease up to diameeter sub-classes of 62.5 and 67.5 cm., where it is smallest and amounts to 15,967 din/cu.m. From these diameter subclasses onwards the cost price is increasing towards the higher diameter subclasses, and in the working-plan diameter sub-class of 87.5 cm. it amounts to 16,559 din./cu.m. Consequently, the most favourable working-plan diameter sub-class of the Fir tree species from the standpoint of the cost price level in the sawmilling are the diameter sub-classes of 62.5 and 67.5 cm. because their cost prices are lowest, and, in addition, according to our previous exeperimental study (4), from them is produced also the most valuable normal edged timber of Fir species, and in particular edged boards of commercial lengths. |