Development of cylindrical laminated veneer lumber by use of helical-winding method.
Grant-in-Aid for Scientific Research (A)
|Allocation Type||Single-year Grants|
|Research Institution||KYOTO UNIVERSITY|
KAWAI Shuichi Wood Res.Insk., Kyoto Univ., Professor, 木質科学研究所, 教授 (00135609)
TAKINO Shinjiro Wood Res.Inst., Kyoto Univ., Res.Assoc., 木質科学研究所, 助手 (90115874)
P Yang Fac.Education, Kumamoto Univ., Lecturer, 教育学部, 講師 (70253705)
NAKAYAMA Akihiro Showa Products Corp., Res.staff, 研究開発部員
MATSUMOTO Yoshikatsu Koshii Wood Ind.Corp., Manag.Director, 常務取締役
SASAKI Hikaru Inst.Wood Tech., Akita Agri.Coll., Prof., 木材高度加工研究所, 教授 (50027158)
|Project Period (FY)
1995 – 1996
Completed(Fiscal Year 1996)
|Budget Amount *help
¥9,500,000 (Direct Cost : ¥9,500,000)
Fiscal Year 1996 : ¥2,000,000 (Direct Cost : ¥2,000,000)
Fiscal Year 1995 : ¥7,500,000 (Direct Cost : ¥7,500,000)
|Keywords||wood composite / laminated veneer lumber (LVL) / cylindrical LVL / helical winding method / lumber composite product|
This study deals with the production of hollow cylindrical laminated veneer lumber (LVL) with helical-winding method. The design and the manufacture of prototype machine on a trial basis and the production technology of cylindrical LVL were investigated. The results obtained were followings ;
1.Rotary-cut veneers were successfully jointed into a long tape by sewing parallel to the length of the tape (across the grain of veneer).
2.The effect of lamination with interlocked grain on the modules of elasticity of LVL was analyzed theoretically, and verified with experimental data.
3.Mixed resole-type adhesive resin proved to shorten the pressing time dramatically to 5 sec at the temperature of 40 C on the adhesive layr.
4.A helical winder with a fixed mandrel showed it principally possible to produce the cylindrical LVL in the continuous process.
5.A prototype helical winder with a slide-shifter was designed and set up on a trial basis and cylindrical LVLs were successfully manufactured.
6.The deformation behavior and the stress distribution due to shrinkage in cylindrical LVL with helical interlocked grain was clarified by a modeling approach with a two-dimensional finite element method.
Research Output (9results)