| 摘要 |
<p>A powder sprayer with electrostatic charging capacity by means of which a colouring powder can be electrostatically charged all over the entire surface of the particles in a simple and effective manner. The powder sprayer comprises a number of curved charging ducts of long extension made of electrically non-conducting material which ducts are coated with electrically conductive layers along the main portion of their extension, said coated layers being connected to conductors outgoing from said layers, whereby a charging of the powder material takes place during its movement through said charging ducts after contact with the inner walls of the ducts when the sprayer is in use.</p> |
