B - Operations – Transporting – 05 – B
Patent
B - Operations, Transporting
05
B
18/1193, 117/54,
B05B 15/04 (2006.01) B05B 5/12 (2006.01) B05D 1/06 (2006.01) B05D 7/00 (2006.01) B29C 37/00 (2006.01) B29C 41/36 (2006.01) B29C 41/00 (2006.01)
Patent
CA 1205690
MOLD MASKING APPARATUS AND METHOD Abstract of the Disclosure A method and apparatus is disclosed for powder coating the interior surface of a heated mold cavity. Electrostatically charged powder is sprayed upwardly onto the interior surface of a mold surrounded by a mask. The mask includes a shield located adjacent to but spaced from the shear edge of the mold. Addition- ally, the mask includes a vacuum duct located beneath the shield. While air is drawn into the vacuum duct air is either blown through the slot defined between the shield and the mold shear edge or air is pulled into the slot so as to prevent oversprayed powder from coming into contact with and adhering to the shear edge of the mold. There is no enclosure surrounding the mold cavity other than the mask because rising heated air currents entrap and maintain the cloud of sprayed powder interiorly of the mold cavity and the surrounding mask. Any oversprayed material escaping from the cavity is caught in the vacuum duct and carried to a powder collector.
445094
Corporation Nordson
Macrae & Co.
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