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首页> 外文会议>1999 wet end operations short course >The influence of wet-end vibrations on machine-direction basis-weight variations
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The influence of wet-end vibrations on machine-direction basis-weight variations

机译：湿端振动对机器方向基重变化的影响

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Many papers have been published in recent years describing how pressure pulsations can result in machine-direction (MD) basis-weight variations if improperly attenuated. Experience gained on various fourdrinier and twin-wire newsprint machines indicates that air-padded headboxes or those with external attenuation adequately dampen pulsations above 1-2 Hz and that the latter do not generally affect MD basis-weight uniformity. However, numerous cases were found where wet-end vibrations did translate into pronounced MD basis-weight variations, particularly in the frequency range of 10-40 Hz. Case examples are given and include basis-weight variation and vibration frequency spectra. Typical pulsation levels at various locations along the stock system are included.
机译：近年来，已经发表了许多论文，描述了压力脉动如果衰减不当会如何导致机器方向（MD）的基重变化。在各种长网和双网新闻纸机上获得的经验表明，空气填充的流浆箱或具有外部衰减功能的流浆箱能够充分抑制1-2 Hz以上的脉动，并且后者通常不会影响MD基准重量的均匀性。但是，发现了很多情况，尤其是在10-40 Hz的频率范围内，湿端振动确实转化为明显的MD基重变化。给出了实例，包括基本重量变化和振动频谱。包括沿储备系统不同位置的典型脉动水平。

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