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Siska, Grace
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Physics

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Kualitas Biopelet Cabang Kayu Kawui (Vernonia arborea Buch.Ham) Menggunakan Tiga Level Persentase Perekat : Quality of Bio-pellets from Kawui Wood Branches (Vernonia arborea Buch.Ham) Using Three Levels of Adhesive Percentage Indrayanti, Lies; Siska, Grace; Luhan, Gimson; Jesica, Irma
HUTAN TROPIKA Vol 18 No 2 (2023): Volume 18 Nomor 2 Tahun 2023
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v18i2.11964

Abstract

The research aims to determine the quality of bio-pellets from Kawui wood branches using three levels of adhesive percentage. The materials used are branch wood from Kawui and tapioca flour adhesive. The research method employs a Completely Randomized Design with a single factor, namely the adhesive percentage. The factor consists of three levels: adhesive percentages of 10%, 20%, and 30%, with five repetitions. The results indicate that the adhesive percentage does not significantly affect the ash content, volatile matter content, and fixed carbon content, except for calorific value and density. The quality of bio-pellets meets the SNI 8675-2018 standard for household and industrial scales at all adhesive percentages, except for volatile matter content and fixed carbon content. According to French standards, the quality of bio-pellets meets the standards for every parameter except calorific value at the 30% adhesive percentage. According to Swedish standards, the quality of bio-pellets meets the standards for every parameter except moisture content at the 10% adhesive percentage and calorific value at the 30% adhesive percentage. Overall, the 20% adhesive percentage exhibits the best quality
Sifat Fisika Dan Mekanika Papan Partikel Dari Kayu Durian (Durio zibethinus Murr): The Physical and Mechanical Properties of Particle Board from Durian Wood (Durio zibethinus Murr) Indrayanti, Lies; Siska, Grace; Wahyudi, Wahyudi; Setiarno, Setiarno; Sianipar, L.
HUTAN TROPIKA Vol 19 No 1 (2024): Volume 19 Nomor 1 Tahun 2024
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v19i1.14275

Abstract

The studi aimed to determine the characteristics particle board of Durian Wood. The material used durian wood which is no longer productive. The adhesive used is PVAc adhesive. The research method used a Completely Randomized Design with a single factor, namely particle size with 3 levels, namely 4.5 and 6 mesh. The parameters tested, namely the physical and mechanical properties of the board, refer to the SNI 03-2105-2006 standard. The results showed that the average water content ranged from 16.94–17.25%, density 0.134–0.145 g.cm-3, water absorption capacity 2.09– 2.50%, thickness expansion 10.93–15.25% , while MoE 65629.90-79209.38 kgf.cm-2, MoR 267.86 – 431.33 kgf.cm-2, internal bond strength 0.08–0.15 kgf.cm-2, Screw holding strength 0.021 –0.035 kgf. Thickness development at the 5 mesh level, Modulus of Elasticity (MoE), and Modulus of Ropture (MoR) have met the SNI 04-2105-2006 standards, while the water content, density, water absorption capacity, internal adhesive strength and Screw holding strength still do not meet the standards set. The highest MoE reached 125,000 kgf.cm-2 and MoR reached 643 kgf.cm-2. The results of mechanical tests show that particle board of durian wood has the potential to be used as interiors construction.
Studi Pendahuluan Kualitas Kayu Hutan Tanaman Eucalyptus Pellita F. Muell dengan Teknologi Modifikasi Panas Oil Heat Treatment (OHT) : Preliminary Study of Wood Quality of Plantation Forest of Eucalyptus pellita F. Muell with Oil Heat Treatment Heat Modification Technology Christy, Eva Oktoberyani; Siska, Grace
HUTAN TROPIKA Vol 19 No 2 (2024): Volume 19 Nomor 2 Tahun 2024
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v19i2.18591

Abstract

Indonesia's Industrial Forest Plantations (HTI) cultivate various fast-growing tree species such as Eucalyptus pellita F. Muell. Environmentally friendly and appropriate technologies can be used to improve the weaknesses and deficiencies of wood from HTIs. The Oil Heat Treatment (OHT) process does not use chemicals. This research aims to determine the effect of OHT duration of 0.5 hours, 1.5 hours, and 2.5 hours at a temperature of 200 ± 2°C on the physical properties of Eucalyptus pellita F. Muell. The results showed that the OHT heat treatment using used cooking oil significantly affected the moisture content but did not significantly affect the density
Uji Kualitas Log Kayu Kawui (Vernonia arborea Burch Ham) Setelah Masa Simpan Lima Tahun: Kawui Wood Quality Test after Five Years Storage Indrayanti, Lies; Siska, Grace; Afentina, Afentina; Wardhani, Isna
HUTAN TROPIKA Vol 19 No 2 (2024): Volume 19 Nomor 2 Tahun 2024
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v19i2.18592

Abstract

This study aims to understand physical and mechanical traits of kawui wood after storage period of five years. Further, this study aims to understand how the five years storage period influence the quality of kawui wood, and thus, it ensures the expected standard quality of the wood after longer term of storage. The method used in this study is Complete Randomized Design factorial, whereby the first factor is tree. The second factor is the year which are year 1 (2019) and year 2 (2024). Each of the factor is executed within tree repetition. The making of test samples followed the DIN 52-183 and 52 182 standards. The results show that for the density, MoR and MoE parameters of kawui wood with a storage period of five years is a significant effect except for the water content parameter. The average water content value of the research results was 14%, still within the reference design value of SNI 7973: 2013 which sets the water content at 19%. The decrease in density values showed the same tendency as the decrease in MoR and MoE values. The decrease in MoR value with a storage period of five years ranged from 12.5-25%., while the decrease in MoE value with a storage period of 5 years ranged from 3-6% and was included in the E8 quality of SNI 7973: 2013 regulations
Water Content and Specific Gravity of Pulai (Alstonia scholaris) Coppice Wood: Potential Utilization Indrayanti , Lies; Yanarita; Koroh, Desy Natalia; Siska, Grace; Joni, Herwin; Santosa, Mahdi; Ciluk, Yan
Jurnal Penelitian Pendidikan IPA Vol 12 No 2 (2026): In Progress
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v12i2.14290

Abstract

The study aims to determine the water content and specific gravity and analyze both on the potential utilization of pulai coppice wood. The study was conducted at the Forest Products Technology Laboratory, Forestry Department, Faculty of Agriculture, Palangkaraya University. Pulai coppice wood material was taken around the Palangka Raya University Campus, tree diameter 34cm, branch-free height 7m. Using a 2-factor factorial Randomized Block Design with 3 levels, the first factor is the axial direction, namely the base, middle and tip. The second factor is the radial direction, namely near the heart, between the heart and the bark and near the bark. The parameters observed were green water content, air-dry water content, green specific gravity, air-dry specific gravity and oven-dry specific gravity. The results showed an average value of green water content of 84.75%, air-dry water content of 18%, green specific gravity of 0.29%, air-dry specific gravity of 0.30% and oven-dry specific gravity of 0.31%. All parameter values ​​​​resulted from the research on pulai coppice wood were lower than the values ​​​​of the main stem pulai coppice wood from previous studies. In the axial direction, all parameter values ​​show an increasing pattern from base to tip, except for the wind-dry moisture content, which shows the opposite pattern. In the radial direction, the values ​​tend to be uniform, except for the green specific gravity, which decreases from the outside (near the bark) to the inside (near the heart). The results of the analysis of variance indicate that all parameters influence the axial direction, while only the green specific gravity influences the radial direction. This indicates that the axial factor dominates the physical properties of pulai coppice wood. The interaction factors that influence this are green water content and oven-dry specific gravity. Based on the specific gravity and wind-dry moisture content values, pulai coppice wood is lightweight and adapts quickly to its environment, thus quickly achieving dimensional stability. This pulai coppice wood is suitable for light construction and interior use.
Co-Authors Afentina, Afentina Christy, Eva Oktoberyani Ciluk, Yan Gimson Luhan Indrayanti , Lies Indrayanti, Lies Jesica, Irma Joni, Herwin Koroh, Desy Natalia Lies Indrayanti Santosa, Mahdi Setiarno, Setiarno Sianipar, L. Wahyudi Wahyudi Wardhani, Isna Yanarita