Electrostatic coating of substrates of medicinal products
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United States of America Patent
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Aug 12, 1997
Issued Date -
N/A
app pub date -
Aug 15, 1995
filing date -
Feb 22, 1991
priority date (Note) -
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Abstract
A method of coating substrates of medicinal products with a dry powder includes the following steps: feeding the medicinal substrates onto a conveying belt (1); supplying the dry powder to a region (5) through which the substrates are to be conveyed; conveying the medicinal substrates on the conveying belt (1) through the region (5) with the conveying belt and/or the substrates maintained at a different electric potential from the dry powder, whereby the dry powder is attracted to the exposed surfaces of the substrates but is unable to reach the coated surfaces of the substrates in contact with the conveying belt, and treating the dry powder coatings to convert the powder into a fused film secured to the substrates.
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