Physical-mechanical properties and bonding quality of heat treated poplar (I-214 clone) and ceiba plywood

doi:10.3832/ifor1276-007

The present paper investigates the physical and mechanical modifications of both poplar (I-214 clone) and ceiba veneers and plywood after heat treatments of different intensities (5 and 7 % of dry mass losses). Plywood panels were glued before and after heat treatment with urea-formaldehyde (UF) and melamine-urea-formaldehyde (MUF) resins. In order to assess the treatments’ effects on both the wood and the glues, the dry mass, the density, the bending strength, the Young’s modulus and the bonding quality were measured before and after heat treatment. The results of the different treatments were compared as well. Results showed that the loss in cell wall polymers due to the heat treatment caused a significant reduction of the equilibrium moisture content of the samples. From a mechanical point of view the treatment resulted in an important reduction of strength and in a small reduction of stiffness. Bonding quality as well as mechanical properties were widely affected by the heat treatment. The different intensities of the treatments (the treatment range was up to 5% and 7% of dry mass loss) did not show significant differences for most of the features assessed. The mechanical performance as well as the bonding quality of treated samples suggested that veneers should be glued after heat treatment. Apparent cohesive wood failure showed that different degradations affect wood and glues with a prominent effect on the glues for UF resins and a prominent effect on the wood for MUF resins.

Keywords

Heat Treatment, Poplar, Ceiba, Plywood, Bonding Quality, Physical-mechanical Properties

Authors’ address

(1)

GESAAF, University of Florence, v. S. Bonaventura 13, I-50145 Firenze (Italy)

(2)

DiSAFA, University of Turin, v. L. da Vinci 44, I-10095 Grugliasco (TO - Italy)

Corresponding author

Francesco Negro
francesco.negro@unito.it

Citation

Goli G, Cremonini C, Negro F, Zanuttini R, Fioravanti M (2014). Physical-mechanical properties and bonding quality of heat treated poplar (I-214 clone) and ceiba plywood. iForest 8: 687-692. - doi: 10.3832/ifor1276-007

Academic Editor

Marco Borghetti

Paper history

Received: Feb 24, 2014
Accepted: Sep 11, 2014

First online: Dec 17, 2014
Publication Date: Oct 01, 2015
Publication Time: 3.23 months

Open Access

This article is distributed under the terms of the Creative Commons Attribution-Non Commercial 4.0 International (https://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Articles citing this article

List of the papers citing this article based on CrossRef Cited-by.

(1)

Bak M, Németh R (2012)
Changes in swelling properties and moisture uptake rate of oil-heat-treated poplar (Populus x Euramericana cv. Pannónia) wood. Bioresources 7 (7): 5128-5137.
CrossRef | Gscholar

(2)

DM (2008)
Italian Ministerial Decree DM 10.10. 2008. Dispositions for regulating formaldehyde emission from wood based panels and their products in life and stay environments. Ministero del Lavoro, della Salute e delle Politiche sociali, Roma, Italy, pp. 5 [in Italian].
Gscholar

(3)

EN 310 (1994)
Wood-based panels - Determination of modulus of elasticity in bending and of bending strength. CEN, European Committee for Standardization, Brussels, Belgium, pp. 9.
Online | Gscholar

(4)

EN 314-1.2 (2005)
Plywood - Bonding quality - Part 1: Test methods. CEN, European Committee for Standardization, Brussels, Belgium, pp. 21.
Online | Gscholar

(5)

EN 322 (1994)
Wood-based panels - Determination of moisture content. CEN, European Committee for Standardization, Brussels, Belgium, pp. 4.
Online | Gscholar

(6)

EN 323 (1994)
Wood based panels - Determination of density. CEN, European Committee for Standardization, Brussels, Belgium, pp. 4.
Online | Gscholar

(7)

EN 326-1 (1995)
Wood based panels. Sampling, cutting and inspection. Sampling and cutting of test pieces and expression of test results. CEN, European Committee for Standardization, Brussels, Belgium, pp. 12.
Online | Gscholar

(8)

EN 13986 (2004)
Wood-based panels for use in construction. Characteristics, evaluation of conformity and marking. CEN, European Committee for Standardization, Brussels, Belgium, pp. 54.
Online | Gscholar

(9)

Finnish ThermoWood Association (2003)
ThermoWood handbook. Finnish ThermoWood Association, Helsinki, Finland, pp. 66.
Gscholar

(10)

Kamdem DP, Pizzi A, Jermannaud A (2002)
Durability of heat-treated wood. Holz als Roh- und Werkstoff 60 (1): 1-6.
CrossRef | Gscholar

(11)

Navi P, Sandberg D (2012)
Thermo-hydro-mechanical processing of wood. EPFL Press, Lausanne, Switzerland, pp. 280.
Online | Gscholar

(12)

Nazerian M, Ghalehno MD (2011)
Physical and mechanical properties of laminated veneer lumber manufactured by poplar veneer. Journal of Agricultural Science and Tecnology A 1:1040-1045.
Online | Gscholar

(13)

Paul W, Ohlmeyer M, Leithoff H (2006)
Thermal modification of OSB-strands by a one-step heat pre-treatment - Influence of temperature on weight loss, hygroscopicity and improved fungal resistance. Holz als Roh- und Werkst 65:57-63.
CrossRef | Gscholar

(14)

Poncsák S, Shi SQ, Kocaefe D, Miller G (2007)
Effect of thermal treatment of wood lumbers on their adhesive bond strength and durability. Journal of Adhesion Science and Technology 21 (8): 745-754.
CrossRef | Gscholar

(15)

Sandberg D, Haller P, Navi P (2013)
Thermo-hydro and thermo-hydro-mechanical wood processing: an opportunity for future environmentally friendly wood products. Wood Material Science and Engineering 8 (1): 64-88.
CrossRef | Gscholar

(16)

Sernek M, Boonstra M, Pizzi A, Despres A, Gérardin P (2008)
Bonding performance of heat treated wood with structural adhesives. Holz als Roh- und Werkstoff 66 (3): 173-180.
CrossRef | Gscholar

(17)

Taghiyari HR (2011)
Study on the effect of nano-silver impregnation on mechanical properties of heat-treated Populus nigra. Wood Science and Technology 45 (2): 399-404.
CrossRef | Gscholar