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Original scientific paper
https://doi.org/10.5552/drvind.2020.1969

Thermal Degradation of Bonding Strength of Aspen Plywood

Pavlo Bekhta   ORCID icon orcid.org/0000-0002-4320-5247 ; Department of Wood-Based Composites, Cellulose and Paper, Ukrainian National Forestry University, Lviv, Ukraine
Nataliya Bekhta ; Department of Design, Ukrainian National Forestry University, Lviv, Ukraine

Fulltext: english, pdf (604 KB) pages 185-192 downloads: 133* cite
APA 6th Edition
Bekhta, P. & Bekhta, N. (2020). Thermal Degradation of Bonding Strength of Aspen Plywood. Drvna industrija, 71 (2), 185-192. https://doi.org/10.5552/drvind.2020.1969
MLA 8th Edition
Bekhta, Pavlo and Nataliya Bekhta. "Thermal Degradation of Bonding Strength of Aspen Plywood." Drvna industrija, vol. 71, no. 2, 2020, pp. 185-192. https://doi.org/10.5552/drvind.2020.1969. Accessed 18 May 2021.
Chicago 17th Edition
Bekhta, Pavlo and Nataliya Bekhta. "Thermal Degradation of Bonding Strength of Aspen Plywood." Drvna industrija 71, no. 2 (2020): 185-192. https://doi.org/10.5552/drvind.2020.1969
Harvard
Bekhta, P., and Bekhta, N. (2020). 'Thermal Degradation of Bonding Strength of Aspen Plywood', Drvna industrija, 71(2), pp. 185-192. https://doi.org/10.5552/drvind.2020.1969
Vancouver
Bekhta P, Bekhta N. Thermal Degradation of Bonding Strength of Aspen Plywood. Drvna industrija [Internet]. 2020 [cited 2021 May 18];71(2):185-192. https://doi.org/10.5552/drvind.2020.1969
IEEE
P. Bekhta and N. Bekhta, "Thermal Degradation of Bonding Strength of Aspen Plywood", Drvna industrija, vol.71, no. 2, pp. 185-192, 2020. [Online]. https://doi.org/10.5552/drvind.2020.1969

Abstracts
The objective of this research was to study the effect of exposure time on the bonding strength of aspen plywood at elevated temperatures. The plywood samples were manufactured under laboratory conditions using two types of adhesive: urea-formaldehyde (UF) and phenol-formaldehyde (PF). The plywood samples were tested after exposure to three different temperatures (150 °C, 200 °C and 250 °C) and three exposure time levels (1, 2 and 3 hours) at each temperature. Additionally, a set of control samples was tested at room temperature. The quality of bonding was assessed by shear strength test in compliance with the requirements of the standard EN 314-1. The mass and density losses as well as colour changes of the plywood samples were also determined. The findings of this study indicated that exposure of plywood panels to elevated temperature caused significant degradation of their bonding strength. PF plywood samples lost 63.2 % of their initial strength after 3 h of exposure at 250 °C, while UF samples lost 65.9 % of their initial strength already after 3 h of exposure at the temperature of 200 °C. Statistical regression-based models were also developed for predicting the loss of plywood bonding strength as functions of mass and density losses and total colour difference. As the mass/density losses or total colour difference of panels increased, the losses in bonding strength increased too.

Keywords
plywood; heat treatment; bonding strength; mass loss; density loss; colour change

Hrčak ID: 238952

URI
https://hrcak.srce.hr/238952

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