| 摘要 |
PURPOSE: An extruding device of a synthetic resin pipe is provided to express color tones of two kinds by intermittently injecting synthetic resin materials of different color tones while extruding the synthetic resin pipe. CONSTITUTION: In an extruding device of a synthetic resin pipe, synthetic resin materials input in a cylinder(10) through a hopper(12) are heated and melt by a heater(11). A compression screw mounted to the inside of the cylinder compresses the melt synthetic resin materials and feeds the melt synthetic resin materials to an outlet of the other side of the cylinder while receiving power of a reduction motor(14) to rotate. A cylindrical forming groove(21) is formed to the inside of a die(20) mounted to the outlet. The synthetic resin materials are formed in the synthetic resin pipe while being extruded through the forming groove. An outlet of an auxiliary cylinder(30) is combined to a combining hole bored in the side of the die and is connected to a cylindrical injection groove formed to the inside of the die. The outlet side of the injection groove communicates with the forming groove of the die and synthetic resin materials of different color tones discharged through the injection groove and the outlet of the auxiliary cylinder are extruded together with the synthetic resin materials discharged through the outlet of the cylinder. A synthetic resin material input hopper(32) and a heater(31) are mounted to the auxiliary cylinder. A compression screw is mounted to the inside of the auxiliary cylinder and the compression screw receives power of a reduction motor to rotate.
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