Skip to main content
Journal of Wood Science

Official Journal of the Japan Wood Research Society

Download PDF
  • Original Article
  • Published:

Calculation models of pressure and position of curved laminated veneer lumber in molds during pressing

Journal of Wood Science volume 45, pages 213–220 (1999)Cite this article

Abstract

Curved laminated veneer lumber (LVL) for use in furniture-making was produced from glue-coated pieces of rotary-cut veneers that were assembled and pressed between molds. Pressure was applied until glue-lines were set and finally held in an assembly of the desired curvature. Pressure was an important factor during pressing of curved LVL. In this study we deduced some equations for designing the shape of molds and calculating the total pressure from the mechanics. The results are summarized as follows: (1) The position angle of every section of curved LVL assembly in molds on the horizontal and the total pressure during pressing can be calculated in relation to the shapes and dimensions of the curved LVL. (2) The pressure distributions in the glue-line measured using pressure-sensitive film were in good agreement with the glue-line unit pressure provided for the experiment and calculation. Therefore, the equations deduced in this study were suitable for calculating the position angle and pressure of curved LVL in molds. (3) The total pressure on curved LVL was greater than the pressure on straight LVL. The total pressure consisted of the pressure on the glue-lines of straight LVL with the same length and width as curved LVL plus the supplementary pressure needed to bend the veneers. (4) The total pressures and position angles of curved LVL in molds were affected by the shape, bent angle, and length of each section of curved LVL.

References

  1. Wu ZH, Furuno T, Zhang BY (1998) Properties of curved laminated veneer lumber made from fast-growing species with radio frequency heating for use in furniture. J Wood Sci 44:275–281

    Article  Google Scholar 

  2. Liu ZC, Zhang BY, Wu ZH (1989) Application and technology of bending and gluing multi-layer veneers in furniture manufacture. China For Prod Ind 3:25–28

    Google Scholar 

  3. Wu ZH, Furuno T, Zhang BY (1997) Temperature properties of curved laminated veneer lumber during hot pressing with radio frequency heating. Mokuzai Gakkaishi 43:847–854

    CAS  Google Scholar 

  4. Wu ZH (1989) Mold design and pressure calculation of laminated bends (in Chinese). Building Wood Based Panels 4:1119

    Google Scholar 

  5. Liu ZC (1983) Technology of wood products and furniture manufacture (in Chinese). China Forestry Publishing, Beijing, pp 239–250

    Google Scholar 

  6. Pound J (1966) Glue-line pressures. Wood (Nov):41–43

  7. Pound J (1965) Making laminated shapes with RF heating. Wood (Oct):55–57

  8. Kanamaru K (1965) Adhesion and lamination (in Japanese). Society of Polymer Science, Chijinshokan Co, Tokyo, pp 150–156

    Google Scholar 

  9. Itoh T, Maeda Y (1992) Strength of structures (in Japanese). Kokumin Kagaku, Tokyo, pp 1–13

    Google Scholar 

  10. Nagao H (1997) Industrial mechanics (in Japanese). Rikootosho, Tokyo, pp 11–48

    Google Scholar 

  11. Yang P, Hata M, Sasaki H, Konishi M, Oshiumi S (1991) Pressure distribution along glue-lines and bonding properties. I (in Japanese). Mokuzai Gakkaishi 37:611–618

    Google Scholar 

  12. Yang P, Hata M, Sasaki H (1991) Pressure distribution along gluelines and bonding properties. II (in Japanese). Mokuzai Gakkaishi 37:619–624

    Google Scholar 

  13. Pound J (1960) RF heating in chair manufacture. Wood (March):104–108

  14. Pound J (1961) RF heating for shaped parts. Wood (Feb):50–60

Download references

Author information

Authors and Affiliations

  1. Faculty of Science and Engineering, Shimane University, 690-8504, Matsue, Japan

    Zhi-Hui Wu, Takeshi Furuno & Hiroshi Yoshihara

Authors
  1. Zhi-Hui Wu
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Takeshi Furuno
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Hiroshi Yoshihara
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Wu, ZH., Furuno, T. & Yoshihara, H. Calculation models of pressure and position of curved laminated veneer lumber in molds during pressing. J Wood Sci 45, 213–220 (1999). https://doi.org/10.1007/BF01177728

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF01177728

Key words