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Open Access Coating Weight Uniformity and Die Internal Design

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Based on the variational methods, design equations for coating dies that are widely used in the photographic emulsion coating industries have been obtained in analytical forms, and the key dimensionless parameters that affect the coating weight uniformity have been identified. The effects on coating weight uniformity of a tapered angle in the die distribution chamber have been investigated and its performance is compared with nontapered dies. The coating weight uniformity index has been defined in terms of the pressure ratio in the distribution chamber and sample calculations have been made for each die to show the effects of die internal dimensions on coating weight uniformity indexes. Other factors that could also affect the coating weight uniformity, such as the precision of machining of the die slot opening, a distorted wetting line on the lower pressure side coating bead meniscus, and turbulent eddies in the vacuum box, have been discussed briefly.
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Document Type: Research Article

Publication date: January 1, 1997

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  • The Journal of Imaging Science and Technology (JIST) is dedicated to the advancement of imaging science knowledge, the practical applications of such knowledge, and how imaging science relates to other fields of study. The pages of this journal are open to reports of new theoretical or experimental results, and to comprehensive reviews. Only original manuscripts that have not been previously published, nor currently submitted for publication elsewhere, should be submitted.

    IS&T's JIST-first publication option allows authors wishing to present their work at conferences, but have a journal citation for their paper, to submit a paper to JIST that follows the same rigorous peer-review vetting and publication process as traditional JIST articles, but with the benefit of a condensed time-to-publication time frame and guaranteed conference presentation slot.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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