In order to gain the drying characteristics of improved-preservative treated rubberwood, the100 °C drying test method was used. Based on the test results, rubberwood drying schedules for lab testwere made out. Th...In order to gain the drying characteristics of improved-preservative treated rubberwood, the100 °C drying test method was used. Based on the test results, rubberwood drying schedules for lab testwere made out. Then a series of lab experiments were conducted in a wood drying trial machine, and finally3 optimized drying schedules for improved-preservative treated rubberwood were gained. And a series offollow-up pilot tests were executed in a rubber wood mill in Hainan province. Results showed thatrubberwood with or without pith should be dried separately. Pith free rubberwood could be dried accordingto the high temperature Schedule C with good drying quality. Uniform spacing stickers and heavy load ontop of stack was recommended to reduce deformation. In order to keep the original color of rubberwood,the rubberwood should be dried according to Schedule A. And Schedule B can also be adopted according tothe requirement of final products of the rubberwood By the manufactory.展开更多
The biological characteristics of the insects and fungi which seriously attack rubberwood and the present state of rubberwood biodeterioration in China were described. The fungi attaching rubberwood consist mainly of ...The biological characteristics of the insects and fungi which seriously attack rubberwood and the present state of rubberwood biodeterioration in China were described. The fungi attaching rubberwood consist mainly of blue stain fungi, moulds and rotting fungi. The insects include beetle borers, termites and some other Coleopteran species, such as longicorns and snout beetles etc., the total insect species are near to one hundred. The stain fungi, moulds and beetles should be paid more attention to in rubberwood preservation.展开更多
The depletion of log resources encourages research into alternative ways to sustain the wood supply.Therefore,the 4-year-old Rubber Research Institute of Malaysia(RRIM)clones series,RRIM 2020 and RRIM 2025,were chosen...The depletion of log resources encourages research into alternative ways to sustain the wood supply.Therefore,the 4-year-old Rubber Research Institute of Malaysia(RRIM)clones series,RRIM 2020 and RRIM 2025,were chosen as potential raw materials for particleboard in this study.The purpose of this study was to assess the effects of planting density and rubber tree clones on the mechanical and physical properties of single-layer particleboard.The planting densities used were low,moderate-low,moderate-high,and high,representing 500,1000,1500,and 2000 trees/ha,respectively.Prior to manufacturing,the RRIM 2000 series clone trees were harvested,cut,chipped,flaked,and screened.The mechanical and physical properties were evaluated in accordance with the Japanese Industrial Standard(JIS A 5908-2003).The findings revealed that both planting density and clone had a significant impact on the mechanical and physical properties of particleboard with a thickness of 10 mm and a density of 700 kg/m3.RRIM 2020 specimens with low planting density had superior modulus of elasticity(MOE),modulus of rupture(MOR),and internal bonding(IB)values of 2415,19,and 1.7 MPa,respectively.Furthermore,moderate-low planting density demonstrated the lowest thickness swelling(TS)and water absorption(WA)values and was comparable to control particleboard from commercial clone Prang Besar(PB),PB260.In terms of rubber clones,RRIM 2020 particleboard met the minimum requirements of the JIS standard for mechanical properties and outperformed RRIM 2025.This study recommended a low planting density of 500 trees/ha and the RRIM 2020 clone as a suitable raw material for particleboard manufacturing with a ten percent urea formaldehyde resin content.展开更多
文摘In order to gain the drying characteristics of improved-preservative treated rubberwood, the100 °C drying test method was used. Based on the test results, rubberwood drying schedules for lab testwere made out. Then a series of lab experiments were conducted in a wood drying trial machine, and finally3 optimized drying schedules for improved-preservative treated rubberwood were gained. And a series offollow-up pilot tests were executed in a rubber wood mill in Hainan province. Results showed thatrubberwood with or without pith should be dried separately. Pith free rubberwood could be dried accordingto the high temperature Schedule C with good drying quality. Uniform spacing stickers and heavy load ontop of stack was recommended to reduce deformation. In order to keep the original color of rubberwood,the rubberwood should be dried according to Schedule A. And Schedule B can also be adopted according tothe requirement of final products of the rubberwood By the manufactory.
文摘The biological characteristics of the insects and fungi which seriously attack rubberwood and the present state of rubberwood biodeterioration in China were described. The fungi attaching rubberwood consist mainly of blue stain fungi, moulds and rotting fungi. The insects include beetle borers, termites and some other Coleopteran species, such as longicorns and snout beetles etc., the total insect species are near to one hundred. The stain fungi, moulds and beetles should be paid more attention to in rubberwood preservation.
基金The authors would like to thank the Ministry of Science,Technology,and Innovation and Ministry of Higher Education as well as the Institute of Tropical Forestry and Forest Products,Universiti Putra Malaysia,for providing the fund INTROP HICOE-(6369115).
文摘The depletion of log resources encourages research into alternative ways to sustain the wood supply.Therefore,the 4-year-old Rubber Research Institute of Malaysia(RRIM)clones series,RRIM 2020 and RRIM 2025,were chosen as potential raw materials for particleboard in this study.The purpose of this study was to assess the effects of planting density and rubber tree clones on the mechanical and physical properties of single-layer particleboard.The planting densities used were low,moderate-low,moderate-high,and high,representing 500,1000,1500,and 2000 trees/ha,respectively.Prior to manufacturing,the RRIM 2000 series clone trees were harvested,cut,chipped,flaked,and screened.The mechanical and physical properties were evaluated in accordance with the Japanese Industrial Standard(JIS A 5908-2003).The findings revealed that both planting density and clone had a significant impact on the mechanical and physical properties of particleboard with a thickness of 10 mm and a density of 700 kg/m3.RRIM 2020 specimens with low planting density had superior modulus of elasticity(MOE),modulus of rupture(MOR),and internal bonding(IB)values of 2415,19,and 1.7 MPa,respectively.Furthermore,moderate-low planting density demonstrated the lowest thickness swelling(TS)and water absorption(WA)values and was comparable to control particleboard from commercial clone Prang Besar(PB),PB260.In terms of rubber clones,RRIM 2020 particleboard met the minimum requirements of the JIS standard for mechanical properties and outperformed RRIM 2025.This study recommended a low planting density of 500 trees/ha and the RRIM 2020 clone as a suitable raw material for particleboard manufacturing with a ten percent urea formaldehyde resin content.
