Development of New Oriented-Mat Formation System Utilizing High-Voltage Electrostatic Field

1. 结果表明，在高压静电场中，木材颗粒产生的转矩主要是由木材OH自由基的极化引起的。提出了一种仅在成形带背面有电极的静电定向系统。在这个系统中，两个垫子被顶对顶地搭配在一起，形成一个特殊的垫子，对两个表面都有更好的朝向。建立了半工业规模的试验装置。运筹学研究证实，该系统比常规系统获得了更均匀的垫料密度，并且适合于小而薄的颗粒。研究发现，将具有各向异性介电介质的薄片置于电极与木材颗粒之间，可以增加木材颗粒中产生的转矩。将此原理应用于上述成形装置，取得了颗粒取向的显著改善。该系统生产的定向板具有良好的定向结构性能。

1. It was clarified that torque induced in wood particles placed in a high-voltage electrostatic field was mainly caused by the polarization of OH radicals of wood.2. An electrostatic orientation system which has electrodes only at the reverse side of the forming belt was proposed. In this system, two mats were mated top to top to build up a special mat having better orientation towards both surfaces.3. A test plant of semi-industrial size was built up. The operational research verified that more even density of mat was achieved in this system than conventional systems, and small, thin particles would be suitable for the system.4. It was found that a certain thin sheet with anistropic dielectricity could increase the torque induced in wood particles when it was placed between electrodes and wood particles. This principle was applied to the above forming plant and remarkable improvement in particle orientation was achieved.5. Oriented boards produced by this new system had satisfactory properties for structural use in the oriented direction.