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Official Journal of the Japan Wood Research Society

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

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 2575. (2) Bath temperature had a remarkable effect on the gelation time of the adhesive mix. (3) High bonding strength was recorded by 2575 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), 2575 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 2575 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.

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Correspondence to Toshihiro Hata.

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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

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Key words

  • Cylindrical LVL
  • Spiral-winder
  • Beltpressing
  • Resin formulation
  • Mechanical properties