KUALITAS PAPAN PARTIKEL DARI CAMPURAN BATANG SORGUM (Sorghum bicolor L.) DAN KAYU AKASIA (Acacia mangium W.) BERDASARKAN KONSENTRASI PEREKAT UREA FORMALDEHIDA

This research aims to analyze the effect of composition in the mixture of sorghum and acacia wood and the adhesive concentration on particle board quality as well as to determine the material composition and adhesive concentration optimum resulting in particleboard that meet the JIS A 5908 type 8 standard. The composition of sorghum and acacia wood used are 100%: 0%, 50% : 50%, 0% : 100%, and urea formaldehyde adhesives used with concentrations of 8%, 10%, 12%. The particle board is made with a size of 30 cm x 30 cm x 1 cm with a target density of 0.8 gr/cm3  then hot press using temperatures of 1300C with pressure 25 kg/cm2 for 10 minutes. Testing of physical properties (density, moisture content, thickness swelling and water absorption) and mechanical properties (modulus of elasticity, modulus of rupture, internal bond and screw holding strength) were carried out according to JIS A 5908-2003 type 8 standard. The results show that  all treatment fulfill the JIS A 5908-2003 type 8 standard for density, moisture content, modulus of rupture, internal bond and screw holding strength. Whereas, the treatment that meet the JIS A 5908-2003 type 8 standard on modulus of elasticity were adhesive concentration of 8% and composition of 0% : 100%;  adhesive concentration of 10% and composition of 50% : 50%; adhesive concentration of 10% and composition of 0% : 100%; adhesive concentration of 12% and composition of 50% : 50%; adhesive concentration of 12% and composition of  0% : 100%.  The thickness swelling and water absorption were not meet the JIS A 5908-2003 type 8 standard. Particleboard with the composition of sorghum of 50% : acacia of 50% and adhesive concentration of 10% is the optimum treatment that produced the board meet the JIS A5908-2003 type 8 standard.Keywords: acacia wood, baggase sorghum , particle board, physical and mechanical propertie

Evaluation of termite resistance of medium density fiberboard (MDF) manufacture from agricultural fiber bonded with citric acid

The 5th Sustainable Future for Human Security (SustaiN 2014)Nowadays, the use of agricultural fibers for panel composite materials attracts great intention. Further, it is desirable to develop of natural adhesive derived from non fossil resources to be safe adhesive without using harmful chemical substances. In this study, citric acid application as natural adhesive was investigated for medium density fiberboard (MDF) manufacture from pineapple leaf fiber. The ratio of citric acid and sucrose and adhesive content was 25–75 and 20 wt%, respectively. Two different types of board consisting of three layers with target density of 0.8 gr/cm³ were prepared. The board was hot pressed at 200 °C and 4.5 MPa for 10 min.Additionalboards with same structure were prepared using citric acid only. The biological properties of the boards such as their resistance against subterranean termite attack have been examined. The results indicate that generally, there was a significant effect of impregnation with mixture of citric acid and sucrose and citric acid only on the susceptibility of the MDF board specimens. With regards to the percentage of specimen mass losses, fiber orientation had no significant effect on the termite resistance against Coptotermes formosanus Shiraki. Utilization of natural adhesive, citric acid was promising to be used for MDF manufacturing. Our findings show that the total adhesive content of 20% of the type a board could be used for agricultural fiber product applications to protect structures from degradation by termites

ヒモクザイ ショクブツ センイソク ノ セイシツ ト ソノ フクゴウ ザイリョウ ノ カイハツ

京都大学0048新制・課程博士博士(農学)甲第13896号農博第1711号新制||農||956(附属図書館)学位論文||H20||N4363(農学部図書室)UT51-2008-C812京都大学大学院農学研究科森林科学専攻(主査)教授 川井 秀一, 教授 矢野 浩之, 教授 今村 祐嗣学位規則第4条第1項該当Doctor of Agricultural ScienceKyoto UniversityDA

Eco-friendly Board from Oil Palm Frond and Citric Acid

The utilization of oil palm fronds as composite board raw material has developed due to the declining wood supply. Currently, citric acid is used as natural adhesive on the wood-based moldings to reduce the use formaldehyde-based resin. Citric acid has carboxylic acid functional group that can react with hydroxyl functional group from cellulose by esterification reaction. This paper explain the production of board from oil palm frond and citric acid, then elaborate their physical and mechanical properties.  Oil palm fronds were processed with ring flaker to produce particles with 1 ~ 5 cm length. The particles were dried until the moisture content reached 6%. Citric acid solution was obtained by stirring 700 g citric acid in 1000 ml water.  Citric acid solution were sprayed onto particles. The weight of citric acid were 10%, 15% and 20% based on oil palm fronds’ dry weight. Boards were produced with density target of 0.6 g/cm3 and pressure at 1N/mm2 for 10 min. The hot pressing temperatures were varied at 140ºC, 160ºC, 180ºC, and 200ºC. Physical and mechanical test were performed according to JIS A 5908-2003. The MOR, MOE, IB and SW values of boards with 15 wt% citric acid content and pressed at 200oC were 5.85 N/mm2, 1067.03  N/mm2, 0.26 N/mm2 and 88.80 N respectively. The optimum condition for board production obtained upon citric acid content and pressing temperature in a range of 15% ~ 20% and 180ºC ~ 200ºC, respectively