| 摘要 |
1,007,631. Conveyers. CHAMPLAIN-ZAPATA PLASTICS MACHINERY Inc. Aug. 27, 1962 [Jan. 22, 1962], No. 32892/62. Heading B8A. [Also in Divisions B2, B5 and F1] A filler nozzle for delivering pre-expanded plastics, e.g. polystyrene beads, to a mould, has a hollow body through which the beads are drawn by a high velocity air discharge from the constricted orifice of a hollow valve rod which is axially movable to halt the flow of beads at the nozzle outlet. Filler nozzle 30 is removably attached to the stationary half 12 of a mould, jacketed at 22 and 24 for steam heating and water cooling. The mould halves are cracked open at 20, during filling, as the action of compressed air flowing from out of the constricted annular orifice 70 of valve rod 60, via passages 84 in outlet core 72, draws the beads through the hollow body 42 from side opening 32. The valve rod 60 moves axially within the body 42, upon the action of compressed air on piston 64 within cylinder portion 66, alternately to retract to permit mould filling and forward for core 72 to close the nozzle; the flow of air through the orifice 70 meanwhile being halted or, alternatively, sustained in order to cool the nozzle and avoid clogging with beads. The nozzle may additionally be water cooled. |
