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Journal : Jurnal Ilmu dan Teknologi Kayu Tropis

Effects of Several Synthesis Conditions on Bond Strength of Plywood Adhered with Natural Rubber Latex – Styrene Adhesive Hermiati, Euis; Fatriasari, Widya; Falah, Faizatul
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 4, No 1 (2006): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Jurnal Ilmu dan Teknologi Kayu Tropis

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Abstract

This report discusses the effects of synthesis conditions on bond strength of plywood adhered with natural rubber latex - styrene adhesive.  Synthesis variables observed were catalyst (with and without catalyst), pre-stirring (0 and 3 hours) and heating time (1 and 2 hours).  Three-ply plywood samples were prepared from Albizia (Paraserianthes falcataria) and Red meranti (Shorea, sp.) veneers and their gluability were evaluated in accordance to Indonesian Standard (SNI 01-2704-1992).  The results revealed that synthesis conditions (i.e. catalyst, pre-stirring and heating time) did not significantly influence the bond strength of plywood.  Natural rubber latex – styrene adhesive is very appropriate as adhesive for Red meranti plywood.  Nevertheless, it can be used as limited interior application for Albizia plywood.  An addition of 10% phenol formaldehyde (PF) in natural rubber latex - styrene adhesive slightly improved the exterior type bond strength of Red meranti plywood
Kraft and Soda Pulping of White Rot Pretreated Betung Bamboo Fatriasari, Widya; Ermawar, Riksfardini A; Falah, Faizatul; Yanto, Dede HY; Adi, Deddy TN; Anita, Sita H; Hermiati, Euis
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 9, No 1 (2011): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Jurnal Ilmu dan Teknologi Kayu Tropis

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Abstract

This research was conducted to study the effects of pre-treatment with white-rot fungi on pulp properties of betung bamboo. Inoculum stocks of white-rot fungi (25 ml) were injected into polybags contained barkless fresh bamboo chips. Each polybag contained 214.9–286.8 g oven dry weight of chips. Bamboo chips in the polybags were inoculated by Pleurotus ostreatus and Trametes versicolor. Both of them were then incubated for 30 and 45 days at room temperature. Bamboo chips were cooked using soda and Kraft processes. The cooked bamboo chips were then defiberize using disc refiner for 3 times. Pulp yield, kappa number and degree of freeness of the pulp were then analyzed. The treatment of two white rot fungi, gave different effects on the characteristic of betung bamboo pulp. The effects of fungi treatment on kappa number and degree of freeness can be seen only at samples cooked using kraft process. Incubation time did not affect pulp yield of bamboo treated with both fungi, but it affected kappa number and degree of freeness of bamboo pulp cooked using kraft process. Bamboo treated with T. versicolor incubated for 45 days and cooked using kraft process produced the best pulp quality with high pulp yield.Key words: betung bamboo, biopulping, degree of freeness, kappa number, pulp yield.
The Pretreatment Effect of Single Culture White Rot Fungi on the Anatomical Structure of Betung Bamboo Fatriasari, Widya; Damayanti, Ratih; Anita, Sita H
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 10, No 1 (2012): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Jurnal Ilmu dan Teknologi Kayu Tropis

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Abstract

This study was to investigate the changes of morphological, macroscopic and microscopic characteristic on betung bamboo fiber during single culture of white rot fungi pretreatment. Fresh, and bark less 2 years old betung bamboo (Dendrocalamus asper) chips, 1.6 cm in length were inoculated by 10% of white-rot fungi inoculums stock for 30 and 45 days in room temperature. This study used three kinds of fungi i.e Trametes versicolor, Pleurotus ostreatus and Phanerochaete chrysosporium. After the incubation period was finished the chips were separated by maceration process (Schutze method) to analyze the fiber dimension and its derived value. The fibers were then observed the macroscopic and microscopic structure by optical microscope. The pretreatment caused the decreasing of fiber length, cell wall thicknesses, while the lumen and fiber diameter were since in versa. The improvement on fiber derived value except muhlsteph ratio was found in this study. Bamboo pretreated by T. versicolor for 30 days showed the best fiber dimension and fiber derived value and the treated bamboos were predicted to produce pulp with superior grade quality (grade I).Key words: bamboo structure, betung bamboo, fiber dimension, white rot fungi
Fortifikasi Perekat Lateks Karet Alam-Stirena dengan Isosianat: Karakteristik dan Aplikasinya pada Kayu Lapis (Fortification of Natural Rubber Lateks-Styrene with Isocyanate: Characteristics and its Application for Plywood Adhesive) Fatriasari, Widya; Ruhendi, Surdiding
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 8, No 2 (2010): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Jurnal Ilmu dan Teknologi Kayu Tropis

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Abstract

This study was to evaluate the blending composition effects of natural rubber lateks-styrena (NRL-St)/isocyanate adhesive on their properties and sengon plywood quality. The blending mixture consists of 100/0, 90/10, 80/20, 70/30 and 0/100. Physico-chemical properties of these adhesives in therms of solid content (gravimetric method), pH (pH indicator paper), viscosity (Viscometer Brookfield), and contact angle (Motic software) were characterized. The bond strength (SNI 01-2704-1992) and formaldehyde emission (WKI bottle method) of plywood were also determined. Isocyanate fortification increased the solid content and viscosity of adhesive mixture, while pH was vice versa. The contact angle of adhesive mixture was about 450.Isocyanate fortification onto NRL-St improved plywood bond strength and significant improvement was happened on the composition of 80/20. Plywood hot pressing for 5 minutes increased the bond strength until isocyanate fortification 20%, while 10 minutes hot pressing also improved the bond strength on all of the composition adhesive. Only adhesive mixture of 70/30 that gave the lowest formaldehyde emission and fulfiled E1 standard (<0.1 ppm). Generally,the increasing of hot pressing time tended to decrease formaldehyde emmision of plywood. Bond strength of plywood fulfill SNI standard and E1 standard was isocyanate fortification of 30%.
Physical and Mechanical Properties of Oriented Strand Board Prepared from Acetylated Wood Strands Iswanto, Apri H; Fatriasari, Widya; Yunianti, Andi D; Zailani, Ahmad; Febrianto, Fauzi
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 11, No 2 (2013): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Jurnal Ilmu dan Teknologi Kayu Tropis

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Abstract

The objectives of this research were to evaluate of the physical and mechanical properties of oriented strand board (OSB) prepared from acetylated wood strands. Strands derived from Acacia mangium wood were immersed in acetic anhydride for 24 h. After that, strands were dried at 60 C to reach moisture content (MC) of 5%. The slenderness and aspect ratios of strands were 100.72±39.42 and 3.05 ± 0.44. Boards size and target density were set at (25x25x0.5) cm3 and 0.7 g cm-3. The strand compositions for face, core, and back layers were 25, 50, and 25%, respectively. Phenol formaldehyde (PF) resin with amount of 8% was used to bind the strands. The results showed that weight percent gain (WPG) of acetylated strands was 4%. Acetylated strands resulted in improvement of dimensional stabilization (water absorption (WA) and thickness swelling (TS) parameters) with anti-shrink efficiency (ASE) value of 19.65%. On the other hand, the modulus of elasticity (MOE), modulus of rupture (MOR) and internal bond (IB) were found to decrease with acetylation treatment. All the physical and mechanical properties of OSB evaluated except IB parameter fulfilled the requirements of JIS A 5908-2003 standard.Key words: acetylated, anti-shrink efficiency, dimensional stability, oriented strand board
Tekno Ekonomi Produksi Perekat Aqueous Polymer Isocyanate Berbasis Lateks Karet Alam (Techno-Economic of Natural Rubber Latex-Based Aqueous Polymer Isocyanate Adhesive) Sari, Fahriya Puspita; Fatriasari, Widya; Laksana, Raden BP; Darmawan, Teguh; Jayadi, Jayadi; Hermiati, Euis
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 14, No 2 (2016): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Jurnal Ilmu dan Teknologi Kayu Tropis

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Abstract

Natural rubber latex (NRL)-based aqueous polymer isocyanate (API) adhesive can potentially be used for the production of wood panels or composites. Bonding properties of the adhesive could meet the standard of the wood panels produced. In order to complete its assessment as a commercial wood adhesive, it is important to conduct a techno-economic analysis of this adhesive. The design and analyses were based on 100 L production capacity. The techno-economic analysis as a basis value of the investment to be incurred in the API adhesive production considered the capability of design tools during the production process. Based on the analysis, to produce API adhesives by 34.8 tons per year it is required an investment of 509.5 million rupiahs. The production cost of API adhesives for Rp 50.000 kg-1 is Rp 35.798 with assuming a sales profit of 21.30%. The payback period is 1 year with shut down point (SDP) of 14%, and the break-even point (BEP) of 20.51%. The analysis at various production capacities (34.8, 50, 75, and 100 tons year-1) indicated that API adhesive production will be more profitable with greater production capacity because it can shorten the payback period and increase the return on investment.Keywords: API adhesives, low temperature setting, natural rubber latex (NRL), production design, techno-economic