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Development of cylindrical laminated veneer lumber by use of helical-winding method.

Research Project

Project/Area Number 07556042
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section試験
Research Field 林産学
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

KAWAI Shuichi  Wood Res.Insk., Kyoto Univ., Professor, 木質科学研究所, 教授 (00135609)

Co-Investigator(Kenkyū-buntansha) 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
Project Status 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)
Keywordswood composite / laminated veneer lumber (LVL) / cylindrical LVL / helical winding method / lumber composite product
Research Abstract

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.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report

Research Products

(9 results)

All Other

All Publications

  • [Publications] Sasaki, H, et. al.: "Cylindrical LVL for Structural Use Made by Spiral Winding Method" Proc. Intern'l Wood Engineering Coxf. '96. Vol.3. 538-540 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Sasaki, H, et. al.: "Manufacture and Properties of Hollow Cylindrical LVL" Proc. Third Pocific Rim Bio-Based Composites Symp.335-339 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yang, P., et. al.: "Analysis of Residual Stress Distribution of Cylindrical LVL with Herical Interlocks Grain" Proc. Third Pocific Rim Bio-Based Composites Symp.340-345 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Sasaki, H. ; Yamauchi, H. ; Koizumi, A. ; Iijima, Y. ; Tamura, Y. ; Sasaki, T. ; Kawai, S.: "Cylindrical LVL for structural Use Made by Spiral-Winding Method" Proc.International Wood Engineering Conf.'96. Vol.3. 538-540 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Sasaki, H. ; Yamauchi, H. ; Miura, I. ; Koizumi, A.: "Manufacture and Properties of Hollow Cylindrical LVL" Proc.Third pacific Rim Bio-Based Composites Symposium. 335-339 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yang, P. ; Yamauchi, H. ; Sasaki, H.: "Analysis of Residual Stress Distribution of Cylindrical LVL with Helical Interlocked Grain" Proc.Third Pacific Rim Bio-Based Composite Symposium. 340-345 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Sasaki,H,et.al.: "Cylindrical LVL for Structural Use Mode by Spiral Winding Method" Proc.Intern'l Wood Engineering Conf.'96. Vol.3. 538-540 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Sasaki,H.et.al.: "Manufacture and Properties of Hollow Cylindrical LVL" Proc.Third Pacific Rim Bio-Baced Composites Symp.335-339 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Yang,P.,et.al.: "Analysis of Residual Stress Distribution of Cylindrical LVL with Herical Interlocked Grain" Proc.Third Pacific Rim Bio-Based Composites Symp.340-345 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1995-03-31   Modified: 2016-04-21  

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