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首页> 外文会议>International Mechanical Pulping Conference; 20070506-09; Minneapolis,MN(US) >POWER THRESHOLD EFFECT IN GRINDING - AN EXPRESSION OF ELASTIC WORK?
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POWER THRESHOLD EFFECT IN GRINDING - AN EXPRESSION OF ELASTIC WORK?

机译：磨削中的功率阈值效应-弹性功的表达吗？

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摘要

Mechanical pulping processes, including pressurized groundwood (PGW) consume much more electrical energy than would be adequate for production of new fiber surfaces. Many investigations have shown that the major part of this energy is consumed by elastic deformations of wood. This paper discusses the so-called power threshold effect (PTE) in the grinding process. PTE is herein defined as the grinding power required to initiate and maintain the defibration process. It is assumed that the PTE might be associated with energy that is spent in elastic deformation of the wood related to the grits. These studies were conducted with a pilot grinder in PGW-S conditions. The PTE was defined in an experiment in which the grinding power was gradually increased until the fiber production started. The pulps were also analyzed for CSF and tensile index. It was determined that with a conditioned grinding surface the grinding power of the pilot grinder could be increased to half of its normal operational range before any significant fiber production was initiated. Below this power limit, it was assumed that the wood was wearing through abrasive processes. Beyond the power limit the production rate increased at a much greater pace and obviously the major wood wear process was defibration. Based on the findings in this study, it might be too straightforward to claim that PTE is a direct indication of the amount of elastic work that is needed to initiate and maintain the fatigue of wood and, consequently, the defibration process in grinding. However, more detailed research and reasoning regarding the power threshold effect (PTE) might help us to better understand the defibration process and the generation of different fiber fragments in grinding and the contribution of these processes in total energy consumption.
机译：机械制浆工艺（包括加压磨木（PGW））消耗的电能远远多于生产新纤维表面所需的电能。许多研究表明，这种能量的大部分被木材的弹性变形消耗。本文讨论了磨削过程中的所谓功率阈值效应（PTE）。 PTE在本文中定义为引发和维持解纤过程所需的研磨力。假定PTE可能与在与the粒有关的木材的弹性变形中所花费的能量有关。这些研究是在PGW-S条件下使用中试磨床进行的。 PTE是在一个实验中定义的，在该实验中，逐渐增加研磨力，直到开始生产纤维。还分析了纸浆的CSF和拉伸指数。已经确定，在开始任何重要的纤维生产之前，使用经过调节的研磨表面，可以将中试研磨机的研磨能力提高至正常工作范围的一半。低于此功率极限，可以认为木材是通过研磨过程磨损的。超出功率极限，生产率以更大的速度增长，显然，主要的木材磨损过程是纤维分解。根据这项研究的发现，断言PTE可以直接表明引发和保持木材疲劳以及因此而引起的磨削过程中的疲劳所需的弹性功的数量可能太简单了。但是，有关功率阈值效应（PTE）的更详细的研究和推理可能有助于我们更好地了解解纤过程以及研磨中不同纤维碎片的产生以及这些过程在总能耗中的作用。

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