Influence of the DC Field on Moisture Resistance and Strengthof the Plywood Materials

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UDС

674.028.9

DOI:

10.17238/issn0536-1036.2017.5.127

Abstract

The article presents data on the influence of the DC field on the moisture resistance and adhesion properties of plywood materials. We have obtained the values of electret characteristics of plywood materials from different types of wood and adhesives. The polarization of plywood in the preparation process or the polarization of only glue in the DC field can significantly increase its strength properties (adhesion strength of the glue-veneer joint). The shear strength increases by 15…350 % at the preliminary polarization of the adhesive; the shear strength increases by 15…450 % when the plywood samples are polarized in the process of their manufacture, compared to the samples that are not subjected to the electric field. The plywood materials from birch veneer possess the greatest values of the shear strength, as this kind of veneer has higher strength factors of wood fiber. The plywood sam-ples polarized in the DC field are more resistant to delamination, creasing, and retain its integrity longer in a humid environment. This is due to the influence of the polarized state of glue on the adhesion to veneer. The effect of the electric field on plywood samples increases the moisture resistance by 0.9…22.0 %, and the water resistance value – by 3.0…17.0 %. The proposed method is of practical interest and can be realized industrially to produce high-density moisture-proof plywood.

Authors

A.F. Zamilova, Postgraduate Student
M.F. Galikhanov, Doctor of Engineering Sciences, Professor
N.A. Pestova, Master

Affiliation

Kazan National Research Technological University, ul. Karla Marksa, 68, Kazan, 420015, Russian Federation; e-mail: Alinka-attractive@yandex.ru, mgalikhanov@yandex.ru, pestovanata@mail.ru

Keywords

plywood, polarization, urea formaldehyde resin, epoxide resin, polyvinyl acetate, strength, DC field, moisture absorption, water absorption ability

For citation

Zamilova A.F., Galikhanov M.F., Pestova N.A. Influence of the DC Field on Moisture Resistance and Strength of the Plywood Materials. Lesnoy zhurnal [Forestry journal], 2017, no. 5, pp. 127–138. DOI: 10.17238/issn0536-1036.2017.5.127

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Received on May 22, 2017