EFFECTS OF LAYER STRUCTURE AND PARTICLE CHARACTERISTIC ON PROPERTIES OF PARTICLEBOARD MADE FROM DIFFERENT WOOD SPECIES

• Main Authors: , Muhammad Navis Rofii, , Professor Dr. T.A. Prayitno
• Format: Theses and Dissertations NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2012
• Subjects: ETD
• Online Access: https://repository.ugm.ac.id/97643/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=54181
• Institution: Universitas Gadjah Mada

The most commonly used particleboard has three layers: two face layers and one core layer. Structures of these layers differ markedly. There are two different elastic bodies (surface and core layer) in the three-layered particleboards. High density raw material was used for particleboard production, where layering and mixing concept with different wood particle types were applied to enhance its performance. This study was aimed to investigate the effects of layer structure and particle characteristic on properties of particleboard made from different types of wood particles. The materials used in this study were hinoki (Chamaecyparis obtusa) strands and knife-milled douglas fir (Pseudotsuga manziesii) as surface layer and hammer-milled matoa (Pometia sp.) as core layer. Those wood particles were collected from wood companies. Adhesive used was MDI resin (methylene diphenyl diisocyanate) 6% content in mat. Pressing conditions were: temperature of 180 °C, pressure of 3 MPa, pressing time of 5 minutes. The target density was 0.72 g/cm³ with board size of 340 mm x 320 mm x 10 mm. Factors used in this study were layer structure according to shelling ratio, particle type and particle mixture. The parameters of this study were: board density and moisture content, thickness swell, water absorption, linear expansion, vertical density profile, Young�s modulus, modulus of rigidity, static bending properties, and internal bonding. This study indicated that all boards meet the requirements of JIS A 5908- 1994. Improvement on mechanical properties of matoa particleboard could be conducted by adding surface layer using higher quality wood particle such as hinoki strand or douglas fir particle. Higher shelling ratio at approximately 0.67 resulted higher mechanical performance of three-layered particleboard. Utilization of hinoki strand as surface layer resulted higher particleboard performance than that of douglas fir. Dynamic Young�s modulus as non-destructive evaluation (NDE) test could be used to predict the elastic bending of particleboard with deviation of about 3 � 20%. Bending stiffness of three-layered particleboard could be predicted by bending stiffness of two elements based on its layer thickness with deviation of about 5 � 24%.