Shear Strength of Exterior Plywood Panels Pressed at Low Temperature

Pavlo Bekhta,Salim Hiziroglu,Jan Sedliacik,Olga Potapova

doi:10.3390/ma2030876

Pavlo Bekhta, Salim Hiziroglu + Show 2 more

Open Access

https://doi.org/10.3390/ma2030876

Copy DOI

Abstract

Plywood manufactured from thin veneer sheets of different species is one of the most traditional structural composite panels. The objective of this study was to produce experimental plywood panels using a temperature of 100 °C, which is 10 to 30% lower than typical press temperature of plywood manufacture. It was determined that shear strength characteristics of the samples were not adversely influenced as function of reduced press temperature. This process can be considered as a promising way to save substantial amounts of energy during pressing processes, which results in a major reduction in overall production costs.

Highlights

Glueline quality is one of the most important properties of plywood, influencing almost all its physical and mechanical characteristics
Materials 2009, 2 time, and press temperature are some of the raw material and manufacturing parameters that need to be taken into consideration to obtain satisfactory plywood shear strengths
The strength values of the samples made from birch using only phenol formaldehyde resin without any additives increased with increasing press temperature

Summary

Introduction

Glueline quality is one of the most important properties of plywood, influencing almost all its physical and mechanical characteristics. In various previous studies it was found that if press temperatures above 130 °C are used for plywood manufacture, significant reduction of cohesive glueline strength takes place, resulting in defective plywood [2,3,4,5,6,7]. According to several past studies, it was concluded that the pressure of gas-vapor mixture in glueline is increased with increasing press temperature, causing development of bubbles within the glueline [1,9,10,]. Some other studies have revealed that using a lower temperature in the plywood manufacture press line had no influence if phenolic and resorcinol adhesives, combined with different hardeners including dichrome sodium, are used [14,15,16,17,18]. Orlov used different combination of urea formaldehyde resin and to successfully press plywood samples at a temperature of 100 °C [17]

Objectives

Methods

Results

Conclusion