| 摘要 |
<p>A drop former includes a rotary screen (14) forming an internal chamber (30) into which a flowable chemical (FC) is introduced, the chamber being kept at atmospheric pressure. The screen has a thickness in the range of .1 to 1.2mm. As the screen moves, the flowable chemical is caused to impinge against a pressure member (40) 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 (12). 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. <IMAGE></p> |
