Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
권호 표지
DOI QR코드

DOI QR Code

Effect of Green Tea Content on Dynamic Modulus of Elasticity of Hybrid Boards Composed of Green Tea and Wood Fibers, and Prediction of Static Bending Strength Performances by Flexural Vibration Test

녹차-목재섬유복합보드의 동적탄성률에 미치는 녹차배합비율의 영향 및 휨 진동법에 의한 정적 휨 강도성능 예측

  • Park, Han-Min (Faculty of Forest Science, Institute of Agriculture & Life Science, Gyeongsang National University) ;
  • Lee, Soo-Kyeong (Faculty of Forest Science, Institute of Agriculture & Life Science, Gyeongsang National University) ;
  • Seok, Ji-Hoon (Faculty of Forest Science, Institute of Agriculture & Life Science, Gyeongsang National University) ;
  • Choi, Nam-Kyeong (Faculty of Forest Science, Institute of Agriculture & Life Science, Gyeongsang National University) ;
  • Kwon, Chang-Bea (Faculty of Forest Science, Institute of Agriculture & Life Science, Gyeongsang National University) ;
  • Heo, Hwang-Sun (Faculty of Forest Science, Institute of Agriculture & Life Science, Gyeongsang National University) ;
  • Byeon, Hee-Seop (Faculty of Forest Science, Institute of Agriculture & Life Science, Gyeongsang National University) ;
  • Yang, Jae-Kyung (Faculty of Forest Science, Institute of Agriculture & Life Science, Gyeongsang National University) ;
  • Kim, Jong-Cheol (Institute of Hadong Green Tea)
  • 박한민 (경상대학교 환경산림과학부, 농업생명과학연구원) ;
  • 이수경 (경상대학교 환경산림과학부, 농업생명과학연구원) ;
  • 석지훈 (경상대학교 환경산림과학부, 농업생명과학연구원) ;
  • 최남경 (경상대학교 환경산림과학부, 농업생명과학연구원) ;
  • 권창배 (경상대학교 환경산림과학부, 농업생명과학연구원) ;
  • 허황선 (경상대학교 환경산림과학부, 농업생명과학연구원) ;
  • 변희섭 (경상대학교 환경산림과학부, 농업생명과학연구원) ;
  • 양재경 (경상대학교 환경산림과학부, 농업생명과학연구원) ;
  • 김종철 (하동녹차연구소)
  • Received : 2011.09.21
  • Accepted : 2011.11.28
  • Published : 2011.11.25
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, eco-friendly hybrid composite boards were manufactured from green tea and wood fibers for application as interior materials with various functionalities of green tea and strong strength properties of wood fibers. In this relation, the effect of green tea content on dynamic MOEs (modulus of elasticity) of these green tea and wood fibers composite boards were investigated. The dynamic MOEs of hybrid composite boards were lower than those of control boards without green tea, and the values decreased with the increase of green tea content. Also, the dynamic MOEs appeared to be somewhat different by resin type used for board manufacture. The hybrid composite boards manufactured from $E_1$ grade urea resin, which has higher molar ratio of formaldehyde to urea than that of $E_0$ grade one, were 1.06~1.54 times higher than that manufactured from $E_0$ grade. And, the differences between hybrid composite boards manufactured from both adhesive increased with the increase of green tea content. On the other hand, high correlations were found between dynamic MOE and static bending strength performances, it was concluded that static bending strength performances could be estimated from the dynamic MOE, except for a few hybrid board types with large variations.

이 연구에서는 녹차와 목재섬유를 복합한 친환경 복합보드를 건축내장재로 활용하기 위하여, 목재섬유에 대한 녹차의 배합비율을 달리한 녹차-목재섬유 복합보드를 제작하였고, 복합보드의 동적탄성률에 미치는 녹차의 배합비율 및 바인더로 사용한 접착제의 영향을 조사하였다. 녹차-목재섬유복합보드의 동적탄성률은 녹차를 넣지 않은 대조보드(control boards)의 그것보다 적었고, 녹차배합비율이 증가할수록 커지는 경향을 나타내었다. 또한, 보드제조에 사용된 바인더의 종류에 따라 동적탄성률의 차이가 나타났는데, $E_1$급의 요소수지가 $E_0$급의 요소수지보다 1.06~1.54배의 높은 값을 나타내었으며, 녹차의 배합비율이 커질수록 양자의 차이는 커지는 것이 확인되었다. 한편, 녹차-목재섬유복합보드의 동적탄성률과 휨 강도성능과는 비교적 높은 상관관계가 확인되어 일부 편차가 큰 조건을 제외하고 동적탄성률로부터 정적 휨 강도성능의 예측이 가능할 것으로 확인되었다.

Keywords

References

  1. 김희수, 양한승, 김현중, 이영규, 박희준. 2004. 옥수수전분을 충전제로 첨가한 생분해성 고분자 복합재료의 열적성질. 목재공학 32(5): 29-38.
  2. 박상범. 2006. 은행나무 잎을 혼합하여 제조한 파티클 보드의 물리.기계적 성질과 포름알데히드 저감효과. 임산에너지 25(2): 28-33.
  3. 박한민, 강동현, 임나래, 이수경, 정강원, 김종철, 조경환. 2010. 녹차와 목재섬유복합보드의 정적 휨 강도성능에 미치는 녹차배합비율의 영향. 농업생명과학연구 44(5): 1-8.
  4. 박한민, 강동현, 최윤은, 안상열, 류현수, 변희섭. 2010. 목재와 목질재료 복합적층재의 휨 크리프 성능. 목재공학 38(1): 1-10.
  5. 박한민, 문성재, 최윤은, 박정환, 변희섭 2009. 목재와 목질재료 복합적층재의 휨강도성능. 목재공학 37(6): 546-555.
  6. 이병호, 김희수, 최성우, 김현중. 2006. 표면처리에 의한 왕겨분말-폴리프로필렌 바이오복합재의 계면 접착력 향상. 목재공학 34(3): 38-45
  7. 이세나, 이병호, 김현중, 김수민, 엄영근. 2009. 대나무 분말의 함량 및 입자크기에 따른 바이오 복합재의 물성평가. 목재공학 37(4): 310-319.
  8. 이화형, 김관의. 2003. 점토목재파티클보드로 제조된 Clay-Woodceramics의 성질. 목재공학 31(5): 80-87.
  9. 정동효. 2004. 차의 성분과 효능. 홍익재. p. 296-299.
  10. Ayarkwa, J., Y. Hirashima, and Y. Sasaki. 2001. Predicting modulus of rupture of solid and finger-jointed tropical African hardwoods using longitudinal vibration. Forest Prod. J. 51(1): 85-92.
  11. Byeon, H. S., H. M. Park, C. H. Kim, and F. Lam. 2005a. Nondestructive evaluation of strength performance for finger-jointed woods using flexural vibration techniques. Forest Prod. J. 55(10): 37-42.
  12. Cha, J.-K. 1996. Study on stress waves for development of glulam from domestic small diameter log(1). Mokchae Konghak 24(3): 90-100.
  13. Park, H. M. and H. S. Byeon. 2006. Measurement of dynamic MOE of 3-ply laminated woods by flexural vibration and comparison with bending strength and creep performances. Mokchae Konghak 34(2): 46-57.
  14. Park H. M., M. Fushitani, K. Sato, T. Kubo, and H. S. Byeon. 2003. Static bending strength performances of cross-laminated woods made with five species. J Wood Sci 49: 411-417. https://doi.org/10.1007/s10086-002-0502-x
  15. Park, H. M., M. Fushitani, K. Sato, and T. Kubo. 2004. Static bending strength performances of wood-aluminum hybrid laminated material. Trans. Mat. Res. Soc. Japan 29(5), 2503-2506.
  16. Jang, S.-S. 2000. Evaluation of lumber properties by applying stress waves to larch logs grown in Korea. Forest Prod. J. 50(3): 44-48.
  17. Kataoka, A. and T, Ono. 1975. The relations of experimental factors to the vibration and the measuring values of the dynamic mechanical properties of wood 1. The experimental errors due to the measuring apparatus. Mokuzai Gakkaishi 21(10): 543-550.
  18. Norimoto, M. 1982. Structure and properties of wood used for musical instruments 1. Mokuzai Gakkaishi 28(7): 407-413.
  19. Sobue, N., H. Nakano, and I. Asano. 1984. Vibrational properties of spruce plywood for musical instruments. Mokuzai Gakkaishi 31(1): 93-97.
  20. 朴漢玟, 伏谷賢美. 2007. 木材-アルミニウム複合積層 材の曲げクリープ特性. 木材學會誌 53(1): 14-24.

Cited by

  1. Effect of the Kind and Content of Raw Materials on Mechanical Performances of Hybrid Composite Boards Composed of Green Tea, Charcoals and Wood Fiber vol.41, pp.1, 2013, https://doi.org/10.5658/WOOD.2013.41.1.64
  2. Effect of Density and Mixing Ratio of Mandarin Peels on The Bending Performance of Sawdust-Mandarin Peels Particleboards vol.43, pp.3, 2015, https://doi.org/10.5658/WOOD.2015.43.3.364
  3. Dynamic Modulus of Three-Layer Boards with Different Furnish and Shelling Ratio vol.44, pp.2, 2016, https://doi.org/10.5658/WOOD.2016.44.2.274
  4. Effect of Flame Resistant Treatment on The Sound Absorption Capability of Sawdust-mandarin Peel Composite Particleboard vol.43, pp.4, 2015, https://doi.org/10.5658/WOOD.2015.43.4.511
  5. Physical Properties of Hybrid Boards Composed of Green Tea, Charcoals and Wood Fiber vol.40, pp.6, 2012, https://doi.org/10.5658/WOOD.2012.40.6.406
  6. Relation between the dynamic modulus of elasticity and the static modulus of elasticity, the modulus of rupture of mandarin peel–sawdust composite board vol.63, pp.6, 2017, https://doi.org/10.1007/s10086-017-1655-y