بررسی کاربرد چوب فشردۀ صنوبر در ساخت صندلی‌های چوبی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشگاه زابل و دکتری تخصصی

2 دانشجو

3 هیئت علمی

چکیده

در این تحقیق چوب فشرده‌شدۀ صنوبر برای بهبود مقاومت صندلی­های چوبی استفاده شد و با صندلی­های ساخته‌شده از چوب فشرده‌نشدۀ صنوبر مقایسه شد. صندلی­های چوبی با دو نوع اتصال مرسوم شامل اتصال کام و زبانه و اتصال پین‌ چوبی ساخته شدند. حداکثر نیروی اعمال‌شده از جلو به عقب صندلی براساس استاندارد انجمن کتابخانه­ای آمریکا ثبت شد. نتایج نشان داد که استفاده از چوب صنوبر فشرده‌شده در ساخت صندلی بر مقاومت آن در سطح اطمینان 95 درصد تأثیر معنی­داری دارد و سبب افزایش مقاومت می­شود. حداکثر مقاومت صندلی­های ساخته‌شده از چوب­ فشرده با کام و زبانه نسبت به صندلی­های ساخته‌شده از چوب فشرده­نشده با کام و زبانه 05/57 درصد و صندلی‌های ساخته‌شده از چوب­ فشرده با پین چوبی نسبت به صندلی­های ساخته‌شده از چوب­فشرده‌نشده با پین چوبی 12/64 درصد افزایش پیدا کرد. اتصال چوبی در قطعات چوبی فشرده‌نشده در محل پایۀ عقبی جابه‌جا می­شوند، ولی در قطعات چوبی فشرده‌شده جابه‌جایی کمتری دارند و بعد از جابه‌جایی شکست اتفاق می­افتد. به‌طور کلی، صندلی ساخته‌شده با چوب فشرده‌شدۀ صنوبر و به‌همراه اتصال کام و زبانه دارای بیشترین مقاومت مکانیکی است. مقاومت صندلی­های چوبی به‌دلیل وجود قطعات چوبی اصلاح‌شدۀ آن بهبود یافته است. 

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of using compressed poplar wood in manufacturing of wooden chairs

نویسندگان [English]

  • ali bayatkashkoli 1
  • toktam Hemmati 2
  • mohammad shamsian 3
2 Graduate student
3 Assistant professor
چکیده [English]

In this study, compressed poplar wood was used to improve the strengths of wooden chairs. These chairs were compared to chairs made from uncompressed poplar wood. Wooden chairs were assembled with two types of traditional joints including mortise and tenon and wooden pins joints. The ultimate force was applied from the front to the back of the seat, were recorded according to American library association. The results showed that using of compressed poplar wood in manufacturing of the chairs led to a significant (95%) increase in strength properties. Compared to the chairs of raw poplar wood, strength was increased up to 57.5% and 64.12% at chairs manufacured with compressed poplar wood and joint of mortise-tenon and dowel joints, respectively. Joints of chairs made from raw poplar wood dislocated at back frames, but joint elements of chairs made with compressed poplar wood have lower move than other, and then the failure occurred at back frames. Generally, the chair made of compressed poplar wood and with mortise-tenon joint showed a highest mechanical strength. Moreover, wooden chair strength was improved by modification of wooden elements.

کلیدواژه‌ها [English]

  • dowel joints
  • mortise and tenon joints
  • compressed poplar wood
  • maximum strength
  • wooden chair
[1]. Moshir vaziri, H., and Makhdomi, A. (1992). Iranian poplar is forestry protector and developer of the forest industry, Wood Technical Office, Organization of Forests and Rangelands, Tehran.

[2]. Abbasi, H. (1990). Trees of fast growing. Jahad-e-Daneshghahy, Publication. Gorgan.

[3]. Bayatkashkoli, A., Shamsian, M., and Mansourfard, M. (2012). The effect of number of joints on bending properties of laminated lumber made from poplar (Populus nigra). Forest Study of China, 14(3): 246–250.

[4]. Madhoushi, M., Grey, M., Tabarsa, T., and Rafighi A. (2012). Nail and screw withdrawal strength, MOE and MOR in densified poplar Wood, Iranian Journal of Wood and Forest Science and Technology, 18(4):45-54.

[5]. Badig, J., and Jin, B. (1998). Wood mechanics and its composites products. Translated by Ebrahimi, Gh., Tehran University Publications, Tehran, Iran.

[6]. Inoue, M., Norimoto, M., Tanahashi, M., and Rowell, R.M. (1993). Steam or heat fixation of compression wood. Wood Fiber Science, 25 (3): 224-235.

[7]. Kolmann, F.D., and Cote, W.A. (1984). Principles of wood science and technology. Springer-Verlag, Berlin.

[8]. Marra, A. (1992). Technology of wood bonding: principles in practice. Van Nostrand Reinhold. New York.

[9]. Bayatkashkoli, A., and Jamshedzadeh, M. (2014). Comparing the mechanical strength of wooden chairs constructed using two patterns and mortise and tenon and dowel joints. Iranian Journal of Wood and Paper Science Research, 29 (1): 67-78.

[10]. Ebrahimi, Gh. (2007). Engineering design of furniture Structures. Tehran University Press, Tehran, Iran.

[11]. Eckelman, C. (2003). Textbook of product engineering and strength design of furniture. Purdue University Press. West  Lafayette, USA.

[12]. Eckelman, C., and Haviarova, E. (2006). Performance test of school chairs constructed with round mortise and tenon jounts. Forest Products Journal. 56(3): 51-57.

[13]. Eckelman, C.A. (2004). Engineering design of furniture. Purdue University. USA.

[14]. Bayatkashkoli, A., and Nazerian, M. (2011). Determination of proper college student chair dimension and comparison with the prevalent model. Iranian Journal of Wood and Paper Science Research, 26(4):772-784.

[15]. Haviarova, E., Eckelman, C., and Erdil, Y. (2001). Design and testing of environmentally friendly wood school chairs for developing countries. Forest Products Journal, 51(3): 58-64.

[16]. Furniture - Chairs and tables for educational. institutions Part 2: Safety requirements and test methods. Institute of Standards and Industrial Research of Iran, ISIRI 9697-2, 2010.  (In Persian).

[17]. Furniture –Chairs and tables for educational institutions. Part 2: Safety requirements and test methods. German institute for standardization (Deutsches Institut fur Normung)- Europa Norm, DIN EN 1729-2, 2006.

 [18]. Vesi, J., Ebrahimi, G and Bahmani, M. (2010). A study of the effects of height and thickness of tenon made out of beech and hornbeam on bending strength of mortise and tenon joint. Iranian Journal of Wood and Paper Science Research, 25 (1): 128-137.