Monitoring bond strength development in particleboard during pressing, using acousto-ultrasonics.
作者： Frank C. Beall , Liheng Chen
DOI:
关键词: Curing (chemistry) 、 Root mean square 、 Composite number 、 Bond strength 、 Pressing 、 Hot pressing 、 Materials science 、 Urea-formaldehyde 、 Composite material 、 Adhesive
摘要: As with other composite products, the quality of particleboard is sensitive to manufacturing process. However, there still no efficient on-line technique available monitor and control most critical process in manufacture, adhesive cure during pressing. The objective this study was develop a technique, using Acousto-Ultrasonics (AU), nonintrusively bonding development hot-pressing. A series tests were run 610-by 610-mm laboratory press, which tone-burst signal fixed frequency 60 kHz injected into one platen via waveguide received at platen. Phenol-formaldehyde resin used for preliminary experiments urea-formaldehyde main study. degree curing assessed by measuring internal bond (IB), compared an AU parameter, root mean square (RMS) voltage. During consolidation, RMS reacted primarily change press pressure; subsequently, it followed increase IB reached plateau when completely cured. With extended pressing, decreased, reflecting degraded condition board. These results showed that could be index desired endpoint
cabdirect.org参考文章(25)
Wade R. Rose, S. I. Rokhlin, Peter B. Nagy, Laszlo Adler, Polar Characteristics of the Group and Phase Velocities as Well as the Frequency Dependence of Lamb Waves in Graphite/Epoxy Composites Nondestructive Characterization of Materials II. pp. 61- 68 ,(1987) , 10.1007/978-1-4684-5338-6_6
Mark A. Druy, Lucy Elandjian, William A. Stevenson, In Situ (Autoclave) Cure Monitoring of Composites with IR Transmitting Optical Fibers Springer, Boston, MA. pp. 2039- 2046 ,(1990) , 10.1007/978-1-4684-5772-8_262
F. Picado, D. L. Cassens, J. P. Bradtmueller, Variation in selected properties of industrial grade particleboard Forest Products Journal. ,vol. 44, pp. 50- 56 ,(1994)
M. Szesztay, Z. László-Hedvig, E. Kovacsovics, F. Tüdős, DSC application for characterization of Urea/formaldehyde condensates European Journal of Wood and Wood Products. ,vol. 51, pp. 297- 300 ,(1993) , 10.1007/BF02663798
Michael J. Ehrlich, Christian V. O’Keefe, B. Boro Djordjevic, B. N. Ranganathan, Embedded Acoustic Sensors for Process Control and Health Monitoring of Composite Materials Nondestructive Characterization of Materials VI. pp. 7- 12 ,(1994) , 10.1007/978-1-4615-2574-5_2
John Dorighi, Sridhar Krishnaswamy, Jan D. Achenbach, A Fiber Optic Ultrasound Sensor for Monitoring the Cure of Epoxy Springer, Boston, MA. pp. 657- 663 ,(1996) , 10.1007/978-1-4613-0383-1_85
D. Hunston, F. Mopsik, B. Fanconi, F. Wang, Cure Monitoring for Polymer Matrix Composites Springer US. pp. 275- 291 ,(1986) , 10.1007/978-1-4613-2119-4_13
R. T. Harrold, Z. N. Sanjana, Richard Brynsvold, Acoustic Waveguide Cure Curves for Materials Ranging from Fast Cure Resins to Slow Cure Concrete Springer, Boston, MA. pp. 2297- 2304 ,(1996) , 10.1007/978-1-4613-0383-1_301
John C. Duke, Acousto-ultrasonics : theory and application Plenum Press. ,(1988)
F. F. Wangaard, H. G. Freeman, Effect of wettability of wood on glue-line behaviour of two urea resins. Forest Products Journal. ,vol. 10, ,(1960)