| 摘要 |
PURPOSE: To prevent streaks and other defects at the time of providing adjacent to a low-viscosity layer or a high-viscosity layer by selecting the layers so that the natural frequency response of the slide instabilities of an interface is different from the frequency of a specified process noise source and/or the peak of the amplitude is reduced. CONSTITUTION: When a coating pack consisting of four layers is formed in a slide hopper having four lightweight slots 11 to 14, for example, the shape of current is changed in a series of slide elements 41 to 44, and the nonuniformity generated in one slide element is transmitted to the following slide element. To eliminate this nonuniformity, the growth factor and amplitude are determined as a function of frequency with respect to interfaces 31 to 34 between the respective slide elements, and the growth factor is converted into the maximum wave amplitude versus frequency related to the respective interfaces 31 to 34, The amplitude of the process noise at the respective frequencies is then multiplied by the maximum wave amplitude to determine the thickness of each of the plural fluid layers on the slide elements 41 to 44.
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