Abstract
In this work, the effects of wood species and thickness of low-density polyethylene (LDPE) film on the properties of environmentally-friendly plywood were studied. Rotary-cut veneers from four wood species (beech, birch, hornbeam and poplar) and LDPE film of four thicknesses (50, 80, 100 and 150 µm) as an adhesive were used for making plywood samples. The findings of this study demonstrated that plywood samples using all the investigated wood species bonded with LDPE film showed satisfactory physical–mechanical properties. Poplar veneer provided the lowest values for bending strength, modulus of elasticity and thickness swelling of all the plywood samples, but the bonding strength was at the same level as birch and hornbeam veneer. Beech plywood samples had the best mechanical properties. An increase in LDPE film thickness improved the physical–mechanical properties of plastic-bonded plywood.
Highlights
Wood-based materials are popular materials that are still used extensively as an alternative to solid wood across many industries
The measurement of the core temperature inside the veneer package under given wood species and thickness of low-density polyethylene (LDPE) film was undertaken (Figure 3) according to the procedure described in our previous work [36]
The lowest shear strength in the plywood samples bonded with LDPE film of 50 and 80 μm is due to the low adhesive spread rate for these thicknesses, which was equivalent to 46.0 and 73.6 g/m2, respectively
Summary
Wood-based materials are popular materials that are still used extensively as an alternative to solid wood across many industries. According to the latest data released by FAO [3], during the ten-year period from 2009 to 2018, plywood global production and consumption volumes increased by 101% and 104%, respectively, which amounted to record values in 2018 of over 163 and 161 million m3, respectively (Figure 1). Over the past two years, due to global problems related to the coronavirus, there has been a stagnation in plywood production and consumption. Plywood products are manufactured using different formaldehyde-based adhesives [4]. Despite the fact that these adhesives have good adhesive properties [5], the formaldehyde is emitted in the production and use of plywood. The development of plywood with alternative formaldehyde-free adhesives has attracted increasing attention from both the industrial community and academia in recent years. Demand is growing for plywood that uses new formaldehyde-free adhesive compositions for wood bonding [7]. 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