DBPapers
DOI: 10.5593/sgem2017/62/S26.030

INTENSIVE TECHNOLOGY OF CREATION OF THE HIGH-STRENGTH AND MOISTURE RESISTANT PLYWOOD MATERIALS

R.R. Safin, A. F. Zamilova, M. F. Galikhanov, R.R. Ziatdinov, A. F. Garaeva
Tuesday 12 September 2017 by Libadmin2017

References: 17th International Multidisciplinary Scientific GeoConference SGEM 2017, www.sgem.org, SGEM2017 Conference Proceedings, ISBN 978-619-7408-13-3 / ISSN 1314-2704, 29 June - 5 July, 2017, Vol. 17, Issue 62, 231-238 pp, DOI: 10.5593/sgem2017/62/S26.030

ABSTRACT

The increased requirements to the strength of products from glued wood, in particular to plywood are imposed at the modern wood processing factories. The data on the development of high-strength plywood materials with the use of new intensive technologies are presented in the article. For creation of high-strength plywood polarization is used in the course of production of plywood. Polarization was carried out by means of fixed electric field. It is revealed that process of polarization exerts positive impact on adhesive properties and moisture resistance of plywood materials. It is determined that processing of a polymeric component of glue and of not cured plywood samples by fixed electric field raises its gluing capabilities. The plywood samples obtained by this technology have higher strength. Increase in strength and moisture resistance is explained by change of structure towards streamlining of an arrangement of its elements and reduction of interatomic distance. These structural changes promote removal of internal stresses and transition of atoms to more profitable energy condition. Change of structure of the glue modified by electric field is followed by creation of plywood of the increased strength. The plywood samples polarized in fixed electric field are more resistant to delamination, buckling and keep the integrity in humid environments longer.

Keywords: plywood, polarization, electret, urea-formaldehyde resin, epoxide resin, polyvinyl acetate, strength, DC field, moisture absorption, water absorption.