Drop forming methods and apparatus
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United States of America Patent
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Jun 4, 2002
Issued Date -
N/A
app pub date -
Feb 4, 2000
filing date -
Feb 27, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A drop former includes a rotary screen forming an internal chamber into which a flowable chemical is introduced, the chamber being kept at atmospheric pressure. The screen has a thickness in the range of 0.05 to 0.4 mm. As the screen moves, the flowable chemical is caused to impinge against a pressure member disposed within the chamber to create a hydrodynamic force which forces the chemical through openings of the screen, thereby forming drops which are transferred onto a transfer surface. The drops harden into particles on the transfer surface and are subsequently removed therefrom and collected. The screen may be formed of a photochemically etched, or laser-drilled, metallic sheet.
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