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.
Article PDF
Similar content being viewed by others
Explore related subjects
Discover the latest articles, news and stories from top researchers in related subjects.References
Gibson LJ, Ashby MF (1987) Cellular solid: structure and properties. Pergamon, Oxford, pp 278–325
Furuno T, Sawabe O (1994) Wood science course. II. Structure and properties of wood. Kaisei-sya, pp 95–98
Rosato DV, Grove CS Jr (1964) Filament winding: its development, manufacture, applications, and design. Interscience, New York, p 14
Japan Wood Processing Technology Association (1992) Basic wood science (in Japanese) Kaisei-sya, p 31
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 45:149–156
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 43:747–753
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 Association
Uemura T (1994) Encyclopedia of wood for practical use. Sangyou Chousakai, Tokyo, p 118
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 27:556–565
Japan Wood Processing Technology Association (1996) Wood adhesion and adhesives (in Japanese). Sanchou-shuppan, pp 33–75
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 34:333–336
Wangaad FF (1964) Elastic deflection of wood-fiberglass compos- ite beams. For Prod J 14(6):256
Biblis EJ (1965) Analysis of wood-fiberglass composite beams within and beyond the elastic region. For Prod J 15(2):81
Biblis EJ (1969) Flexural rigidity of southern pine plywood. For Prod J 19(6):47
Ebihara T (1981) Shear properties of laminated-veneer lumber (LVL) (in Japanese). Mokuzai Gakkaishi 27:788–794
Hioki K (1970) Structural mechanics. I. (in Japanese). Asakurashoten, p 131
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 47:350–355
Bohlen JC (1972) LVL laminated veneer lumber development and economics. For Prod J 22(1):18–26
Laufenberg TL (1983) Parallel-laminated veneer: processing and performance research review. For Prod J 33(9):21–28
Author information
Authors and Affiliations
Corresponding author
About this article
Cite this article
Hata, T., Umemura, K., Yamauchi, H. et al. Design and pilot production of a “spiral-winder” for the manufacture of cylindrical laminated veneer lumber. J Wood Sci 47, 115–123 (2001). https://doi.org/10.1007/BF00780559
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00780559