Abstract
The paper discusses the results of a study on the use of fundamentally new equipment (rotary knife mill) for the preparation of secondary fiber waste in the air and the possibility of their full use in finished products for various purposes. In order to justify the effectiveness of the preparation and the feasibility of using secondary wood fiber semi-finished products by a dry grinding method, the physical phenomena and regularities of the mechanism for the preparation of secondary wood fiber semi-finished products by the proposed method are determined and investigated, which characterize the technological process of preparation in air and their possible future use as semi-finished products or in the manufacture of finished products products. The process of dissolution of wood fiber waste was studied, the mechanical effect on wood fiber waste due to face-cross cutting (cutting, crushing, flattening, breaking) and aerodynamic phenomena (breaking, collision, dissolution, fibrillation), contributing to the formation of external and internal fibrillation of the secondary wood fiber, is described. increase in specific surface in the absence of high temperatures and pressure, without the addition of chemical additives, without the use of water and steam. The performed studies allow us to propose a new method and system for the preparation of wood fiber waste by dry grinding, justifying their economic and environmental feasibility.
Highlights
Исследован процесс роспуска древесноволокнистых отходов, описано механическое воздействие на древесноволокнистые отходы за счет торцово-поперечного резания и аэродинамических явлений, способствующие образованию внешнего и внутреннего фибриллирования вторичного древесного волокна, увеличение удельной поверхности при отсутствии высоких температур и давления, без добавления химических добавок, без использования воды и пара
Effect of fiber size distribution on medium-density fiberboard properties caused by varied steaming time and temperature of defibration process // Wood and Fiber Science. 2014. no. 2
In order to justify the effectiveness of the preparation and the feasibility of using secondary wood fiber semi-finished products by a dry grinding method, the physical phenomena and regularities of the mechanism for the preparation of secondary wood fiber semifinished products by the proposed method are determined and investigated, which characterize the technological process of preparation in air and their possible future use as semi-finished products or in the manufacture of finished products products
Summary
Устройство для измельчения и подготовки древесноволокнистых отходов, работающее по сухому способу размола, представляет собой корпус, в котором установлен вал 3 с закрепленными на нем ножами ротора 2, расположенными в шахматном порядке. Сырьем для исследования были выбраны кусковые древесноволокнистые отходы (биобрак) которые подавались в виде обрезков в зазор между ножом статора 1 и ножами ротора 2, где происходил роспуск древесноволокнистых отходов в воздушной среде [19-23]. На рисунке 2 представлены фотографии вторичных древесных волокон, полученных размолом в воздушной среде на лабораторной установке МР-4. 1. Схема лабораторной размольной камеры роторно-ножевой мельницы: 1 – нож статора, 2 – нож ротора, 3 – вал, 4 – корпус, 5 – загрузочное устройство, 6 – сепаратор. Внешнее и внутреннее фибриллирование древесных волокон, которое хорошо видно при исследовании размолотого волокна под микроскопом при увеличении 1500 крат, способствует увеличению удельной поверхности древесных волокон
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