| 摘要 |
<p>An electrostatic flocking system having a hopper for gravitationally feeding flock fibers at a controlled rate to a pickup chamber in an air flow pump. The flow pump has a venturi inlet connector with a multi-branched outlet for delivering accelerated air into the pickup chamber. The pickup chamber has an arcuately recessed bottom wall to cause air from the inlet connector to swirl within the chamber to entrain the flock fibers and to carry them out of the flow pump via an outlet connector to an applicator gun. Conveniently, the flow pump has an auxiliary air inlet port opening into the pickup chamber to allow additional flock-entraining air to be pulled into the chamber by the air swirling therein. The applicator gun has a non-conductive outlet nozzle for reception into the front of the applicator gun, with a plurality of electrodes extending forwardly from the nozzle for electrostatically charging flock fibers passing therethrough. The outlet nozzle has an opening for passage of the flock fibers and entraining air stream, and said opening has a circular cross section at the rear of the nozzle for concentric alignment with the barrel of the applicator gun. The nozzle opening blends into a generally elliptical portion with an elongated axis increasing from the rear to the front of the nozzle so that the flock fibers and air stream are spread into a fan pattern. A diffuser bar extends along the shorter axis of the nozzle elliptical portion to enhance spreading of the exiting fibers and air stream. Conveniently, the exterior of the outlet nozzle has forwardly and inwardly sweeping concave sides so that additional flock-propelling air is drafted into the air stream exiting the nozzle to enhance fiber delivery to an article being coated.</p> |
