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首页> 外文会议>Process control, electrical amp; information conference ISA Pupid 38th annual symposium >Cross direction control - does the benefit justify the cost?
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Cross direction control - does the benefit justify the cost?

机译：交叉控制-好处证明成本合理吗？

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摘要

Bsis weight (BW) variability on a paper machine represents a universal measure of sheet uniformity, both in the MD and CD sense. It is commonly believed that automatic Cross Direction (CD) Control can significantly reduce the BW variability in the CD sense. However, most of the investigations undertaken by EnTech in recent years show otherwise. This paper reveals some of the potential sources of variability that are not always adequately understood before implementing CD control on a paper machine. The paper explores the impact of sensor characteristics, data-box width, MD cyclic variability, and headbox internal design on the interpretation of CD data, and shows how some of these effects can seriously jeopardize the effectiveness of CD control. The paper also reviews the potential gains in CD variability reduction over the wavelength spectrum that are available from CD control, given the characteristic response of a CD actuator to the resulting profile at the reel. At best, the expected gains are modest and apply only to the longer wavelengths. At shorter wavelengths no improvement is possible, while amplification due to mapping misalignemtn is likely.
机译：在MD和CD方向上，造纸机的Bsis重量（BW）变异性都是衡量纸张均匀性的通用指标。通常认为，自动交叉方向（CD）控制可以显着降低CD方向的BW变异性。但是，EnTech近年来进行的大多数调查均显示了相反的情况。本文揭示了一些潜在的可变性来源，在造纸机上实施CD控制之前，这些潜在性并不总是被充分理解。本文探讨了传感器特性，数据盒宽度，MD循环可变性和流浆箱内部设计对CD数据解释的影响，并展示了其中的一些影响如何严重危害CD控制的有效性。本文还回顾了CD调节器在卷轴上对所得轮廓产生的特征响应后，在CD控件可获得的整个波长谱上，CD可变性降低的潜在收益。充其量，预期的增益是适度的，仅适用于更长的波长。在较短的波长下，不可能进行任何改进，而可能由于定位不对准而导致扩增。

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