Abstract
Understanding resin behavior during hot pressing of medium density fiberboard (MDF) is important to optimize panel properties. Before gelation, the mobility of the resin can affect its distribution and penetration on the wood cells during pressing. The resin in MDF boards occurs as coverage on the fibers surface and also penetrates within the fibers. In this paper, the effect of final resin content and physical–mechanical properties of MDF panels was measured under different conditions of press time, temperature and initial resin content. The measurements were performed by the Kjeldahl method. Results showed that a higher amount of initial resin led to a higher resin content in MDF boards. At the same amount of initial resin, a higher final resin content was obtained by increasing the pressing temperature. Furthermore, the final resin content affects the board properties such as internal bond strength and modulus of rupture. The results showed good correlation between mechanical properties and thickness swelling.
Similar content being viewed by others
References
André N, Cho H, Baek S, Jeong M, Young T (2008) Prediction of internal bond strength in a medium density fiberboard process using multivariate statistical methods and variable selection. Wood Sci Technol 42:521–534
Cyr P-L, Riedl B, Wang X-M, Shaler S (2006) Urea-melamine-formaldehyde (UMF) resin penetration in medium-density fiberboard (MDF) wood fibers. J Adhesion Sci Technol 20(8):787–801
Déneši M, Jošcák T, Jošcák M, Bodnár F, Teischinger A (2012) One press cycle production of fiberboard with unsymmetrically distributed densities. Eur J Wood Prod 70(4):471–477
Gavrilović-Grmuša I, Miljković J, Điporović-Momčilović M, Radošević G (2008) Penetration of urea-formaldehyde adhesives in wood tissue—part I: radial penetration of UF adhesives into beech. Bull Fac For 98:39–48
Grigsby W, Thumm A (2012) Resin and wax distribution and mobility during medium density fibreboard manufacture. Eur J Wood Prod 70:337–348
Grigsby W, McDonald AG, Thumm A, Loxton C (2004) X-ray photoelectron spectroscopy determination of urea formaldehyde resin coverage on MDF fiber. Holz Roh Werkst 62:358–364
Kamke FA, Scott KA (2000) Detection of Urea formaldehyde resin distribution with eagle analytical RDM 100. In: Proceedings of the 1998 resin and blending seminar. Portland, Oregon, Composite Panel Association, Gaithersburg, pp 97–101
Loxton C, Thumm A, Grigby W, Adams T, Ede R (2000) Quantification of UF resin distribution on blowline blended MDF fiber and panels. In: Evans PH (ed) Proceeding of the 5th Pacific rim bio-based composite symposium. Australian National University, Canberra, pp 235–242
Maloney T (1989) Modern particleboard and dry-process fiberboard manufacturing, 3rd edn. Miller Freeman Publications, San Francisco
Muñoz-Huerta R, Guevara-Gonzalez R, Contreras-Medina L, Torres-Pacheco I, Prado-Olivarez J, Ocampo-Velazquez R (2013) A review of methods for sensing the nitrogen status in plants: advantages, disadvantages and recent advances. Sensors 13:10823–10843
Murmanis L, Youngquist J, Myers G (1986) Electron microscopy study of hardboards. Wood Fiber Sci 18(3):369–375
Pakdel H, Cyr P-L, Riedl B, Deng J (2008) Quantification of urea formaldehyde resin in wood fibers using X-ray photoelectron spectroscopy and confocal laser scanning microscopy. Wood Sci Technol 42:133–148
Park B, Riedl B, Hsu EW, Shields J (1998) Effects of weight average molecular mass of phenol-formaldehyde adhesives on medium density fiberboard. Holz Roh- Werkst 56:155–161
Park B, Riedl B, Hsu EW, Shields J (2001) Application of cure-accelerated phenol-formaldehyde (PF) adhesives for three-layer medium density fiberboard (MDF) manufacture. Wood Sci Technol 35:311–323
Radotic K, Kalauzi A, Djikanovic D, Jeremic M, Leblanc RM, Cerovic ZG (2006) Component analysis of the fluorescence spectra of a lignin model compound. J Photochem Photobiol B Biol 83:1–10
Robson D (1991) What happens with blending in the MDF blowline. In: Proceedings of 25th international symposium particle/composite materials, Pullman, WA
Saariaho A-M, Jääkeläinen A-S, Matousek P, Towrie M, Parker AW, Vuorinen T (2004) Resonance Raman spectroscopy of highly fluorescencing lignin containing chemical pulps: suppression of fluorescence with an optical Kerr gate. Holzforschung 58:82
Thoemen H, Irle M, Sernek M (2010) Wood based panels: an introduction for specialist. Published by Brunel University Press, London. ISBN 978-1-902316-82-6
Thumm A, McDonald AG, Donaldson LA (2001) Visualisation of UF resin in MDF by cathodoluminescent/scanning electron microscopy. Holz Roh- Werkst 59:215–216
Xing C, Riedl B, Cloutier A (2004) Measurement of urea–formaldehyde resin distribution as a function of MDF fiber size by laser scanning microscopy. Wood Sci Technol 37:495–507
Acknowledgments
The authors would like to acknowledge the financial support of the Iran National Science Foundation (INSF) (Grant Number: 92042268).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Taheri, F., Enayati, A.A., Pizzi, A. et al. Evaluation of UF resin content in MDF boards after hot-pressing by Kjeldahl method. Eur. J. Wood Prod. 74, 237–242 (2016). https://doi.org/10.1007/s00107-015-1003-0
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00107-015-1003-0