| 摘要 |
PCT No. PCT/SE82/00129 Sec. 371 Date Dec. 23, 1982 Sec. 102(e) Date Dec. 23, 1982 PCT Filed Apr. 22, 1982 PCT Pub. No. WO82/03573 PCT Pub. Date Oct. 28, 1982.A powder sprayer to be charged electrostatically, comprising a plurality of elongated, curved charging ducts made of an electrically non-conducting material and coated with an electrically-conducting layer over part of their length and connected via a lead to earth or to a voltage source, so that when the sprayer is used the powder material is charged by close contact with the internal walls of the ducts as it passes through the charging ducts. The ducts are curved around to form at least one loop and/or undulation with their longitudinal center plane extending substantially in the supply direction of the powder.
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