| 摘要 |
PURPOSE:To efficiently form the titled synthetic resin tube, by employing a combination of upper and lower molds having molding grooves in desired shape with a parison delivering nozzle that is movable vertically and horizontally as well as rotatable about its axis. CONSTITUTION:A blow molding machine is placed on an upper plate 29 movable horizontally relative to a frame 8, and the forward end of its tubular section 10 has, through an outer pipe 11, a nozzle 4 that is vertically movable along its axis and also rotatable about its axis. The nozzle 4 is positioned immediately above one end of the molding groove 2b in the lower mold 1b placed on a turn table 6, and then while the tubular parison 3 is continuously delivered from the nozzle 4, the nozzle 4 is moved along the groove 2b while keeping the distance between the nozzle 4 and the molding groove 2b approximately constant, and is also rotated at the curved section of the groove 2b in the direction to follow the curve, so that the parison 3 is placed along the bottom of the groove 2b. Thereafter, the turn table 6 is turned to move the lower mold 1b to be positioned below the upper mold 1a, the molds are closed, and air is blown into the interior of the parison to effect the molding. |
