In this study the properties of plywood manufactured from densified and non-densified veneer sheets and alternate layers of such veneers with and without densification using low amount of adhesive as a function of densification temperature and wood species were investigated. The plywood panels were made from rotary-cut birch and black alder veneers using urea-formaldehyde (UF) adhesive. Veneer sheets with thickness of 1.5 mm were subjected to the thermal-compression at three different temperatures while keeping constant the pressure during a same time span. Five-layers plywood panels were produced using a constant hot-pressing schedule using different amounts of glue spread as a function of the plywood type; such as plywood made from non-densified (80 g/m²) and densified (60 g/m²) veneers only; and combination of them (70 g/m²). The bending strength (MOR) and the modulus of elasticity (MOE) along with the shear strength of the plywood samples for bonding class 1 (dry conditions) have been determined. As expected bending strength of the plywood samples increased with the increasing in density. The increase of veneer densification temperature resulted in a gradually decrease of MOR; MOE and shear strength values for the plywood panels made of densified veneers and mixed panels of both species. The temperature of 150 °C for veneer densification seemed to be enough to achieve enhanced bending and bonding properties. All plywood panels in this study were manufactured using reduced glue consumption and they presented satisfactory properties performance for indoor applications.

中文翻译：

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胶合板致密化温度和木材种类对由致密和非致密胶合板交替层制成的胶合板性能的影响

在这项研究中，研究了由致密化和非致密化单板制成的胶合板的性能，以及使用和不使用致密化剂的情况下这种单板的交替层随致密化温度和木材种类的变化而变化的情况。胶合板由脲醛（UF）粘合剂由旋转切割的桦木和黑al木贴面制成。将厚度为1.5毫米的胶合板在三个不同的温度下进行热压缩，同时在同一时间段内保持恒定的压力。使用恒定的热压时间表生产五层胶合板，根据胶合板类型的不同，涂胶量不同；如非致密化（80 g / m ²）和致密化（60 g / m ²）制成的胶合板）仅贴面; 以及它们的组合（70 g / m ²）。已经确定了粘合等级为1（干燥条件）的胶合板样品的抗弯强度（MOR）和弹性模量（MOE）以及剪切强度。如预期的那样，胶合板样品的弯曲强度随密度的增加而增加。单板致密化温度的升高导致MOR逐渐降低。由致密单板制成的胶合板面板和两种材料的混合面板的MOE和抗剪强度值。单板致密化的150°C温度似乎足以实现增强的弯曲和粘合性能。本研究中的所有胶合板均使用减少的胶水消耗量制造而成，它们在室内应用中具有令人满意的性能。