Journal of Wood Science

, Volume 47, Issue 2, pp 115–123 | Cite as

Design and pilot production of a “spiral-winder” for the manufacture of cylindrical laminated veneer lumber

  • Toshihiro Hata
  • Kenji Umemura
  • Hidefumi Yamauchi
  • Akihiro Nakayama
  • Shuichi Kawai
  • Hikaru Sasaki
Original Article
First Online:
Received:
Accepted:

Abstract

A new spiral-winder was developed for continuous manufacturing of cylindrical laminated veneer lumber (LVL), and a suitable resin adhesive for this cylindrical LVL manufacturing system was investigated. This phase was followed by trial manufacturing and evaluation of cylindrical LVL with the optimum resin adhesive identified. The results are summarized as follows. (1) The shortest gelation time was recorded with a mixture of two commercial resorcinol based resins (DF-1000 and D-33) at a weight ratio of 25∶75. (2) Bath temperature had a remarkable effect on the gelation time of the adhesive mix. (3) High bonding strength was recorded by 25∶75 DF-1000/D-33 adhesive mix at a high press temperature despite a short pressing duration. Based on the results of items (1) to (3), 25∶75 DF-1000/ D-33 is recommended for use in the new spiral-winder. (4) The mechanical properties of cylindrical LVL could be improved by using 25∶75 DF-1000/D-33 with wider veneer width and longer pressing time. (5) The mechanical properties, especially the modulus of rupture, of the cylindrical LVL manufactured require further improvement for practical structural application.

Key words

Cylindrical LVL Spiral-winder Beltpressing Resin formulation Mechanical properties 
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References

  1. 1.
    Gibson LJ, Ashby MF (1987) Cellular solid: structure and properties. Pergamon, Oxford, pp 278–325Google Scholar
  2. 2.
    Furuno T, Sawabe O (1994) Wood science course. II. Structure and properties of wood. Kaisei-sya, pp 95–98Google Scholar
  3. 3.
    Rosato DV, Grove CS Jr (1964) Filament winding: its development, manufacture, applications, and design. Interscience, New York, p 14Google Scholar
  4. 4.
    Japan Wood Processing Technology Association (1992) Basic wood science (in Japanese) Kaisei-sya, p 31Google Scholar
  5. 5.
    Yamauchi H, Miura I, Hata T, Tamura Y, Kawai S, Sasaki H (1999) Manufacture of cylindrical LVL by spiral-winding method. II. Fast-setting adhesives for cylindrical LVL manufacture (in Japanese). Mokuzai Gakkaishi 45:149–156Google Scholar
  6. 6.
    Yamauchi H, Shoho S, Sasaki T, Ping Y, Kawai S, Sasaki H (1997) Manufacture of cylindrical LVL by spiral-winding method. I. Effect of interlocked-plies on the tensile Young's modulus (in Japanese). Mokuzai Gakkaishi 43:747–753Google Scholar
  7. 7.
    Anonymous (1995) Japan industrial standard: phenolic resin adhesives for wood. JIS K6802 1995. Japan Standards Association 8. Anonymous Japan industrial standard: testing method for tensile shear strength of wood-to-wood adhesive bonds. JIS K6851 1994. Japan Standards AssociationGoogle Scholar
  8. 9.
    Uemura T (1994) Encyclopedia of wood for practical use. Sangyou Chousakai, Tokyo, p 118Google Scholar
  9. 10.
    Tochigi T, Kawasaki H, Hayashi D (1981) Studies of the construction material using a rotary-peeled veneer: a rolled-veneer column (RVC). I. Patterns of the gluing pressure system in the RVC processing machine (in Japanese). Mokuzai Gakkaishi 27:556–565Google Scholar
  10. 11.
    Japan Wood Processing Technology Association (1996) Wood adhesion and adhesives (in Japanese). Sanchou-shuppan, pp 33–75Google Scholar
  11. 12.
    Subiyanto B, Kawai S, Sasaki H, Kahar N, Ishihara S (1988) Studies on curing condition of particleboard adhesive. I. Effect of environmental temperature and adhesive temperature on gelation time (in Japanese). Mokuzai Gakkaishi 34:333–336Google Scholar
  12. 13.
    Wangaad FF (1964) Elastic deflection of wood-fiberglass compos- ite beams. For Prod J 14(6):256Google Scholar
  13. 14.
    Biblis EJ (1965) Analysis of wood-fiberglass composite beams within and beyond the elastic region. For Prod J 15(2):81Google Scholar
  14. 15.
    Biblis EJ (1969) Flexural rigidity of southern pine plywood. For Prod J 19(6):47Google Scholar
  15. 16.
    Ebihara T (1981) Shear properties of laminated-veneer lumber (LVL) (in Japanese). Mokuzai Gakkaishi 27:788–794Google Scholar
  16. 17.
    Hioki K (1970) Structural mechanics. I. (in Japanese). Asakurashoten, p 131Google Scholar
  17. 18.
    Yamauchi H, Miura I, Sasaki T, Koizumi A, Kawai S, Sasaki H (1998) Manufacturing condition and mechanical properties of cylindrical LVL manufactured by spiral-winding method (in Japanese). Zairyou Gakkaishi 47:350–355Google Scholar
  18. 19.
    Bohlen JC (1972) LVL laminated veneer lumber development and economics. For Prod J 22(1):18–26Google Scholar
  19. 20.
    Laufenberg TL (1983) Parallel-laminated veneer: processing and performance research review. For Prod J 33(9):21–28Google Scholar

Copyright information

© The Japan Wood Research Society 2001

Authors and Affiliations

  • Toshihiro Hata
    • 1
  • Kenji Umemura
    • 1
  • Hidefumi Yamauchi
    • 2
  • Akihiro Nakayama
    • 3
  • Shuichi Kawai
    • 1
  • Hikaru Sasaki
    • 2
  1. 1.Wood Research InstituteKyoto UniversityKyotoJapan
  2. 2.Institute of Wood TechnologyAkita Prefectural UniversityNoshiroJapan
  3. 3.Showa Marutsutsu Co.OsakaJapan

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