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.

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