A Method of Measuring Wood Failure Percentage of Wood Specimens Bonded with Melamine-Urea-Formaldehyde Resins Using Image Analysis

1) Transparent and colorless melamine-urea-formaldehyde (MUF) resins make it difficult to identify the area of wood failure percentage (WFP) in the fracture surface of bonded wood specimens. Therefore, in this study, we develop a method of measuring WFP after the adhesion strength measurement of MUF resins under shear stress. The fractured wood surface of block shear strength (BSS) specimens bonded with cold-setting MUF resins at three melamine contents (20%, 30%, and 40%) was marked black, and then, WFP was accurately measured via image analysis. WFP values measured using this method consistently increased with BSS as the melamine content increased, showing the reliability of this new method. The results suggested that this new method is useful and reliable for measuring the WFP of the fracture surface of wood specimens bonded with colorless adhesives such as urea-formaldehyde, MUF, and melamine-formaldehyde resins.

[1]  S. Kang,et al.  A Study on the Block Shear Strength according to the Layer Composition of and Adhesive Type of Ply-Lam CLT , 2020, Journal of the Korean Wood Science and Technology.

[2]  Minghao Li,et al.  Rolling shear modulus and strength of cross-laminated timber treated with micronized copper azole type C (MCA-C) , 2020 .

[3]  H. Byeon,et al.  Bending Creep Properties of Cross-Laminated Wood Panels Made with Tropical Hardwood and Domestic Temperate Wood , 2020, Journal of the Korean Wood Science and Technology.

[4]  Junyou Shi,et al.  Research on Flame Retardant Formaldehyde-Free Plywood Glued by Aqueous Polymer Isocyanate Adhesive , 2020, Journal of the Korean Wood Science and Technology.

[5]  J. Vranković,et al.  Application of hardwood for glued laminated timber in Europe , 2020, Journal of the Croatian Association of Civil Engineers.

[6]  V. Causin,et al.  Effects of Storage Time on Molecular Weights and Properties of Melamine-Urea-Formaldehyde Resins , 2020, Journal of the Korean Wood Science and Technology.

[7]  S. Yoo,et al.  Study on the Mechanical Properties of Tropical Hybrid Cross Laminated Timber Using Bamboo Laminated Board as Core Layer , 2020, Journal of the Korean Wood Science and Technology.

[8]  Juliet D. Tang,et al.  Bonding performance of adhesive systems for cross-laminated timber treated with micronized copper azole type C (MCA-C) , 2020 .

[9]  MuhammadAdlyRahandiLUBIS,et al.  Influence of Initial Molar Ratios on the Performance of Low Molar Ratio Urea-Formaldehyde Resin Adhesives , 2020 .

[10]  V. Causin,et al.  Influence of synthesis method and melamine content of urea-melamine-formaldehyde resins to their features in cohesion, interphase, and adhesion performance , 2019, Journal of Industrial and Engineering Chemistry.

[11]  Byung‐Dae Park,et al.  Effect of Synthesis Method and Melamine Content of Melamine-Urea-Formaldehyde Resins on Bond-Line Features in Plywood , 2019, Journal of the Korean Wood Science and Technology.

[12]  A. Pizzi,et al.  Properties of Glued Laminated Timber Made from Fast-growing Species with Mangium Tannin and Phenol Resorcinol Formaldehyde Adhesives , 2019, Journal of the Korean Wood Science and Technology.

[13]  S. M. Lee,et al.  Performance of Hybrid Adhesives of Blocked-pMDI/Melamine-Urea-Formaldehyde Resins for the Surface Lamination on Plywood , 2019, Journal of the Korean Wood Science and Technology.

[14]  Byung‐Dae Park,et al.  Performance of Urea-Formaldehyde Resins Synthesized at Two Different Low Molar Ratios with Different Numbers of Urea Addition , 2019, Journal of the Korean Wood Science and Technology.

[15]  JeongKwan Roh,et al.  Bonding Properties and Resin Exudation Characteristics of Pitch Pine , 2018, Journal of the Korean Wood Science and Technology.

[16]  Weiqing Liu,et al.  EFFECT OF CMC FORMIC ACID SOLUTION ON BONDING PERFORMANCE OF MUF FOR INTERIOR GRADE GLULAM , 2018 .

[17]  Byung‐Dae Park,et al.  Performance of Melamine-Urea-Formaldehyde Resin Adhesives at Various Melamine Contents for Bonding Glued Laminated Timber Under High Frequency Heating , 2017 .

[18]  Xiping Wang,et al.  Detection of wood failure by image processing method: influence of algorithm, adhesive and wood species , 2015, European Journal of Wood and Wood Products.

[19]  A. Pizzi,et al.  Performance of MUF honeymoon adhesive for glulam , 2014, European Journal of Wood and Wood Products.

[20]  J. Paris Wood-adhesive bondline analyses with micro x-ray computed tomography , 2014 .

[21]  K. Harichane,et al.  Effect of curing time on shear strength of cohesive soils stabilized with combination of lime and natural pozzolana. , 2011 .

[22]  Peter Niemz,et al.  Thermal stability of glued wood joints measured by shear tests , 2011, European Journal of Wood and Wood Products.

[23]  Klaus Richter,et al.  Quality control of glulam: shear testing of bondlines , 2010, European Journal of Wood and Wood Products.

[24]  Stephen C Bayne,et al.  A review of adhesion science. , 2010, Dental materials : official publication of the Academy of Dental Materials.

[25]  Christopher G. Hunt,et al.  Adhesives with wood materials : bond formation and performance , 2010 .

[26]  A. Pizzi,et al.  Honeymoon fast-set adhesives for glulam and fingerjoints of higher natural materials content , 2009, European Journal of Wood and Wood Products.

[27]  T. Künniger A semi-automatic method to determine the wood failure percentage on shear test specimens , 2008, Holz als Roh- und Werkstoff.

[28]  F. Kamke,et al.  ADHESIVE PENETRATION IN WOOD—A REVIEW , 2007 .

[29]  A. Pizzi,et al.  Effect of excessive pretreatment of pine timber with CCA wood preservatives on the bond quality of PRF and TRF wood adhesives , 1985, Holz als Roh- und Werkstoff.

[30]  I. Aydin Activation of wood surfaces for glue bonds by mechanical pre-treatment and its effects on some properties of veneer surfaces and plywood panels , 2004 .

[31]  S. Tohmura,et al.  Influence of the melamine content in melamine-urea-formaldehyde resins on formaldehyde emission and cured resin structure , 2001, Journal of Wood Science.

[32]  B. Collett A review of surface and interfacial adhesion in wood science and related fields , 1972, Wood Science and Technology.

[33]  A. Pizzi Melamine–Formaldehyde Adhesives , 2003 .

[34]  A. Pizzi,et al.  Low addition of melamine salts for improved melamine-urea-formaldehyde adhesive water resistance , 2003 .

[35]  A. Pizzi,et al.  Honeymoon MUF adhesives for exterior grade glulam , 2001, Holz als Roh- und Werkstoff.

[36]  M. Dunky,et al.  Urea–formaldehyde (UF) adhesive resins for wood , 1998 .

[37]  A. G. Zink,et al.  Wood failure in plywood shear samples measured with image analysis , 1998 .

[38]  S. Ellis Correlation of Waferboard Internal Bond and Wood Failure as Measured by Image Analysis , 1995 .

[39]  C. Hse Wettability of southern pine veneer by phenol formaldehyde wood adhesives , 1972 .