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Suparman Karnasudirdja

Pusat Penelitian dan Pengembangan Hasil Hutan

Author-ID : 2626679

Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Energy Materials Science & Nanotechnology

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PENGARUH UMUR DAN POSIS! DALAM POHON TERHADAP BEBERAPA SIFAT FISIS KAYU Suparman Karnasudirdja; Edi Sarwono
Jurnal Penelitian Hasil Hutan Vol 6, No 1 (1989): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Pinus merkusii or locally known as Tusam, is one of the plantation species extensively cultiuated in the uarious part of Indonesia. The uses of its wood uary from chopstick and ice cream spoon to some construction item such as trans- mission pole, and a possible use of its wood for cooling tower is still being studied.The paper describes study result of the effect of tree age and position within tree on some physical properties (Specific grauity, moisture content, uolumetric shrinkage and fiber saturation point). The results were computed using the nested or hierarchical classification analysis, and the differences between means tested using Tukey's w procedure.The results shows that the tree age effect significantly the green and air-dry specific gravity, The other properties do not seem to be affected. Between tree differences affect significantly the air-dry moisture content only. Height within tree does affect uery significantly the uolumetric shrinkage from green to ouen dry condition; and from air-dry to ouen dry condition. The ouerall mean and standard deviation ualues for each property had been calculated and the result presented.

KEKUATAN KAYU LAMINA YANG DIBUAT DARI TIGA JENIS KAYU Suparman Karnasudirdja
Jurnal Penelitian Hasil Hutan Vol 6, No 5 (1989): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

The results of strength test of solid and glue laminated timbers represented by Kapur, Teak and Red Meranti are reported in this paper. The method used for the testing was the ASTM D 143-1970.For the purpose of the test, 8 x 12 x 400 cm lumbers of the three species were divided into two groups being de- signated respectively for test in solid and glue laminated form. The first group were tested for modulus of rupture, com- pression parallel to the grain and shear strength under air dry condition. In bending tests, two methods of loading were applied, namely perpendicular and parallel to the laminae in case of glue laminated timbers, and along radial or tangential direction for solid timbers.The second group were resawn further into 0. 9 cm and 1. 9 cm thick timber strips, respectioely, for small size tests of the glue laminated specimens. The 0.9 cm thick strips which were air-dried and then glued with CIBA Phenol resorcinol-formal-dehyde adhesives, were designated for test on modulus of rupture and compression. The 1.9 cm thick strips were divided further into five batches, and each of which were dried respectively until 25, 20, 15, 10 and 5 percent moisture content before glueing with the above mentioned adhesive into six different combination of test pieces namely Teah-Meranti (JM), Teak-Kapur (JK), Meranti-Kapur (MK), Kapur-kapur (KK), Teak-Teak (JJ) and meranti-Meranti (MM).The results of the tests are presented in Table 1 and 2 for modulus of rupture and compression parallel to the grain; and Tabel 3 and 4 respectively for the shear tests of the six lamination combination.

SIFAT PENGERINGAN ALAMI DAN DEHUMIDIFIKASI BEBERAPA JENIS KAYU INDONESIA Syarif Hidayat; Suparman Karnasudirdja
Jurnal Penelitian Hasil Hutan Vol 4, No 3 (1987): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

This paper presents results of laboratory study on the rate of moisture content decrease of 19 timber species. The test specimen from each species were subjected to air drying under sheltered condition (under roof) and drying in a dehumidifying chamber. At the end of each test. the defect of each specimen was recorded, and the most appropriate form of relation between duration of drying and moisture content decrease was sought.From data analysis it was shown that a power form of relationship (Y = aXb) was reasonable, with coefficient of correlation values varying between 0.80-0.90.The result also shows that the longest air drying time (from 60% to 20% moisture content) was recorded by kayu besi (53 days) and the shortest by dama-dama and palapi (18 days).As has been anticipated, drying in the dehumidifier has reduced considerably the time required for drying from 60% to 20% moisture content. For example for the three species mentioned above the figures were 20 days for kayu besi and 5 days for dama-dama and palapi.The result shows further that severe defect was observed in kolaka, bugis, suling and belu itam. The remaining species have either moderate or slight defect.

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