ABSTRACT

Wood is a highly optimised lightweight material showing excellent mechanical properties in the fibre direction. However, strength and stiffness are low perpendicular to grain. Due to knots, stem taper and spiral grain, the wood material includes local and global fibre deviations. Mechanical disintegration of logs into veneers and sawn timber is more or less ignoring the orientation of the natural wood structure, reducing mechanical properties of the grown tree. This is also true for particle production processes e.g. for OSB or particleboard, which also applies cutting and crushing technologies. As a result, conventional mechanical disintegration of logs means, the destruction of a highly optimised structure, which is always accompanied by a significant reduction of mechanical properties. The basic idea of the novel non-cutting chipless particle production process is to preserve the natural structure by employing squeezing and shear forces. These squeezing and shear forces lead to the mechanical disintegration of the logs primarily in the fibre direction, whereby long fibrous particles, so-called macro-fibres, are gained. Macro-fibres gained from this process prove excellent strength properties.

摘要

木材是高度优化的轻质材料，在纤维方向上显示出出色的机械性能。但是，垂直于晶粒的强度和刚度较低。由于结，茎锥和螺旋纹，木质材料包括局部和整体纤维偏差。原木在单板和锯材中的机械分解或多或少地忽略了天然木结构的方向，从而降低了生长树木的机械性能。对于颗粒生产过程（例如OSB或刨花板）也是如此，这也应用了切割和破碎技术。结果，原木的常规机械分解意味着破坏高度优化的结构，这总是伴随着机械性能的显着降低。新型非切割无屑颗粒生产工艺的基本思想是通过利用挤压力和剪切力来保持自然结构。这些挤压力和剪切力导致原木主要在纤维方向上机械分解，从而获得长纤维颗粒，即所谓的大纤维。从该方法获得的大纤维证明了优异的强度性能。