Dissertation > Excellent graduate degree dissertation topics show

Study on Bamboo/Wood Composite Strengthened Laminated Veneer Lumber Procedure by Impregnating Resin Method

Author: LiuHuanRong
Tutor: LiuJunLiang
School: Chinese Academy of Forestry
Course: Wood Science and Technology
Keywords: Wood composite Strengthen Laminated veneer lumber Dipping Hot-pressing process
Type: Master's thesis
Year: 2007
Downloads: 190
Quote: 3
Read: Download Dissertation


With the implementation of natural forest protection project, the high-quality, large-diameter timber resources dwindling, especially wood can be used for building structure material fewer resources, such as timber-framed houses, bridges, etc., replaced by fast growing plantations. The purpose of this study is China's largest resource of bamboo (Phyllostachys pubescens) and plantation poplar (Populus spp.) As raw material, the use of water-soluble low molecular weight phenolic resin impregnated technology, developers can replace the use of high-quality timber structure with wood composite strengthening of laminated veneer lumber. Thesis phenolic resin impregnated poplar veneer and bamboo processing technology, different groups billet technology, hot-pressing process on the the sheet physical and mechanical performance indicators, analysis of the heat transfer of the slab during sintering process The law strengthening the variation of the physical and mechanical properties of laminated veneer lumber and wood composite obtained optimized wood composite reinforced laminated veneer lumber production process. By studying the following conclusions: 1 at room temperature and pressure and pressure two processes on the type of immersion time of the study indicate that veneer impregnation amount increases with the prolongation of the immersion time, the immersion time within 2h impregnation amount of the growth speed. The rapid increase in the the solution impregnation amount under pressurized conditions. Considering production efficiency and cost issues impregnated production of wood composite reinforced laminated veneer lumber recommended pressure impregnation process. 2 resin content is the same, compared to dipping glue two ways laminated veneer lumber production performance, the results show that the same density are two ways to the production of laminated veneer lumber, veneer production dipped laminated timber and glue way compared to the modulus of elasticity (MOE) and bending strength (MOR) increased 20.17% and 44.74%, 24h thickness swelling (TS) decreased 21.76%. 3 different impregnated veneer production of laminated veneer lumber density, MOE, MOR With the increase in the amount of impregnation increases, TS decreases. Veneer impregnated amount of 168% of the production of laminated veneer lumber, the density of 0.66g/cm 3, MOE, the MOR for 15.34GPa and 135.31MPa, respectively, and more than the Japanese standard structural laminated timber 140E (14GPa ) and 180E the Privilege (67.5MPa) standard. 4 hot heat transfer law strengthened through the production of wood composite impregnated laminated veneer lumber: sizing the same amount, the the slab core layer with glue compared dipped heat transfer faster; accelerate the rate of heat transfer and with the increase in the amount of veneer impregnated slab. 130% of the amount of impregnation, pressing temperature 150 ° C, when the pressing pressure of 1.0MPa, the core layer 18mm thick slab pressing temperature is reached the pressing time of the phenol resin (PF) when the curing temperature (139 ° C) for 18min. Five pairs of wood composite reinforced laminated veneer lumber 8 different set of blank: bamboo position close to the surface more wood composite reinforced laminated veneer lumber greater mechanical strength; With the bamboo layers increased, density, MOE, MOR and TS decreased. Impregnated amount of 130% of the thickness of 2.0mm veneer on the surface for the the bamboo group blank production of wood composite strengthened laminated veneer lumber and pure laminated veneer lumber MOE and MOR were increased by 16% and 33 %. The thickness of the veneer laminated timber performance variance analysis showed that the thickness of the veneer to strengthen the inspection wood composite laminated veneer lumber no significant effect on performance indicators. 6 hot pressing process to strengthen the performance impact of laminated veneer lumber wood composite: the higher the pressing temperature, pressing time is longer, the higher the mechanical strength of the compression ratio the greater bamboo composite reinforced laminated veneer lumber. Taking into consideration all conditions, when the the dipping production of wood composite reinforced laminated veneer lumber recommended that the hot pressing process: pressing temperature 140 to 160 ° C, pressing time of 1.2 to 1.6 min / mm (thickness) compression ratio of 15 to 25%, can be selected according to the device condition and production capacity as well as the final product performance requirements.

Related Dissertations

  1. Effect of Polluted Sediment on Water Self-purification adn Its Enhanced Self-purification Mode,X522
  2. Enhanced input on college students' English language ability Empirical Study,H319
  3. Study of Catalyst for Selective Reduction of NO at Low-temperature with NH3,TQ203.2
  4. Fabrication and Property Investigation of Hemp Fiber Reinforced Polypropylene Composite,TB332
  5. Research on Cultivating Sense of Rhythm in Teaching Aerobics of P.e Students,G831.3
  6. Improved rigid steel frame beams study on seismic behavior,TU391
  7. CFT structure stiffener ring node performance of the force,TU398.9
  8. Discussion on financial supervision in the field of financial supervision,F832.1
  9. The Research of Nitric Oxide in Modulating Plant Growth and Oxidative Damage in Wheat Seedings Exposed to Enhanced Ultraviolet-b Radiation,S512.1
  10. Muffler after Gellar deep mold composite toughening process and microstructure,TG355
  11. Study on the Manufacture and Performance Optimization of Reinforced LVL,TS653
  12. Research of Composite Steel-Timber Bridge Deck System Based on CLT,U443.31
  13. Processing Strengthening by EDM and the Characteristic Property Wearing Away of Ti-6Al-4V Alloy,TG661
  14. Composite Anode Materials Based on Mn/Fe Doped (La, Sr)CrO3-δ for Solid Oxide Fuel Cell,TM911.4
  15. On the nature of the right of the prosecution of legal supervision , the connotation and its enhanced,D926.3
  16. Studies of Initial Lung Cancer CT Image Focus Area Enhancement and Segmentation,TP391.41
  17. Analysis of Immune Responses Induced by Mucosal Immunization of BCG and Chimeric Flagellin Expressed ESAT-6,R392
  18. Test Analysis on the Seismic Performance of "+" Shaped R.C. Columns with Angle Steel Reinforced,TU375.3
  19. Clinical Study on Intensive Catgut Embedding Therapy Combined with Stapre Surgery Treating Mixed Constipation,R656
  20. Research on the Function of Government in Agricultural Catastrophe Insurance System,F842.6
  21. The Study of the Effect on Improving the State of Sub-health by Aerobics under Intensive Teaching in Female Students,G831.3

CLC: > Industrial Technology > Light industry,handicrafts > Wood processing industry,furniture manufacturing industry > Processing
© 2012 www.DissertationTopic.Net  Mobile