Prof. Dede Hermawan Creates Variety of Wood Biocomposites
Exports of wood-based panels in Indonesia are the second highest after paper. However, the increase in production and exports was not accompanied by the availability of adequate raw materials, both in terms of quantity and quality.
According to Prof. Dede Hermawan, Professor of the Faculty of Forestry and Environment (Fahutan) IPB University, the supply of wood raw materials has undergone a very significant change.
"Previously the supply came from natural forests and of good quality (large diameter, strong and durable), currently around 90 percent comes from plantation forests that have poor quality (small diameter, less strong and not durable)," he said at the Pre-Press Conference. Professor's Scientific Oration which was held online, (11/8). Thus, he continued, technological innovation is needed. Both in the technology of selecting raw materials and technology of the production process.
“We have developed several biocomposite innovations. There are types of laminated beam biocomposites, block boards, plywood, particle boards and cement boards,” he explained.
The first innovation is the type of Laminated Beam (Glulam) biocomposite, which is laminated wood composed of wood laminates with the direction of the arrangement of the lamina parallel to the fibers. Glulam from fast growing woods such as sengon and mindi has been successfully developed with polystyrene impregnation. This method can increase the durability of sengon glulam from V to III-IV, while mindi glulam increases from class IV to class I-II.
The second innovation is a type of Block-board biocomposite, which is made from methylene diphenyl diisocyanate (MDI) compregnated oil palm trunks, coated with acacia mangium wood finish. The strength of the oil palm block board with isocyanate compregnation treatment, increased significantly compared to the board without treatment, both in terms of bending strength and hardness.
The third innovation is the type of plywood biocomposite. The use of citric acid as a plywood adhesive from sengon wood, with the addition of starch from porang, as an extender, has been successfully developed. The starch used is a by-product of porang glucomannan production, which so far has no added value and is not utilized. The fracture strength and shear strength of plywood increased significantly with the addition of porang flour extenders by 10 percent and 20 percent, respectively.
The fourth innovation is the type of particleboard biocomposite. Particleboard from sorghum bagasse with maleic acid adhesive has been successfully made. The results showed that the maleic acid adhesive particle board had high fracture strength and high adhesive strength and had met the JIS A 5908-2003 standard.
"In addition, we have also developed lightweight roof tiles, particle board and lightweight concrete," he added.
According to him, the composite tile made from sorghum bagasse particle board with a medium density, has a lighter mass than other roof tiles, which is 4.4 kilograms/square meter. So that this tile is very safe for its residents in the event of a disaster, such as an earthquake that causes the collapse of a building.
The second application is a table tennis bat made of sorghum bagasse particleboard. This bet has a bounce quality that is comparable to commercial bets, such as the Donic and Yuguan brand bets. However, these particleboard bets still have a heavier mass than commercial bets.
“The third innovation application is the manufacture of lightweight concrete that is able to heal cracks independently, and can absorb pollutants from the air. Overall, the analysis of crack recovery through the wet-dry cycle on lightweight concrete was able to recover cracks at the age of five days for all variations of the addition of kenaf fiber hydro charcoal. Crack recovery in lightweight concrete ranges from 70.38-100 percent," he concluded. (Zul)
Published Date : 11-Aug-2022
Resource Person : Prof Dede Hermawan
Keyword : Biocomposite, Wood, Fahutan, Professor, IPB University