Honeycombing and Deformation of Six Wood Species and Their Relationship With Several Physical

Abstract

It is presumed that the wood susceptibility to drying defects is related to several physical properties. This paper examines the drying defects: honeycombing and deformation of six wood species (trema, fast growing teak, bayur, jabon, angsana and lamtoro) during high temperature drying and analyses their relationship with initial moisture content, T/R shrinkage ratio and density. Terazawa method was used to examine the defect during high temperature drying. Result shows that after high temperature drying, lamtoro suffers the worst honeycombing (level 4-6), and fast growing teak deforms severely (level 4-6). Regression analysis shows multiple regression models using all physical properties as predictors provides better estimation on deformation and honeycombing than single-predictor regression models. The multiple regression model for each defect could explain 57.52% and 39.46% of variation in deformation and honeycombing, respectively. Keywords: Honeycombing, deformation, high temperature drying, defect, predictor (trema, jati cepat tumbuh, bayur, jabon, angsana, dan lamtoro) ABSTRAK Diasumsikan bahwa perbedaan kecenderungan setiap jenis kayu terhadap cacat pengeringan dipengaruhi oleh beberapa sifat fisik kayu. Tulisan ini mempelajari terbentuknya pecah dalam dan deformasi pada beberapa jenis kayu

Improvement on Several Physical and Mechanical Properties of Jati Utama Nusantara Wood by Thermal Compression Treatment

“…Unfortunately, its dimension is not yet stable. Yuniarti, Basri, and Abdurachman (2017) reported that the ratio of shrinkage in the tangential direction against radial direction (T/R ratio) of the 5year-aged un-densified JUN wood was very high (about 3). Dimensional stability, presented by the T/R ratio, presents one of the wood properties that should be considered in determining the wood uses.…”