| 摘要 |
PURPOSE:To enable to obtain high-quality composite pipe and to provide a mouthpiece of a composite pipe manufacturing device made of synthetic resin, for which a mouthpiece for normal single layer extrusion can be used as it is, by a method wherein an annular resin passage is provided between a die ring and mandrel and a die lip performing extrusion molding of expandable resin is arranged in the resin passage. CONSTITUTION:In the inside of a die ring 1, a mandrel 2 is supported by a plurality of spiders 4 by facing a toe bead 3 in the direction of a resin extrusion machine for constituting an inner and outer layers and an annular resin passage is formed between the die ring 1 and mandrel 2. A resin flow 6 supplied through the resin extrusion machine for constituting the inner and outer layers is divided into two by a die lip 5 and flow by forming the inner layer 7 and outer layer 8. An expandable resin flow 9 is supplied within the die lip 5 from an annular discharge port 10 from an expandable resin extruding machine through a gate 12, an intermediate layer 11 is formed between the inner and outer layers 7, 8 obtained by dividing the resin flow 6 into two, and the inner, outer and intermediate layers 7, 8, 10 are streamed unitarily, which are sent by a former to produce the composite pipe. |
