JP2514468B

PURPOSE:To improve productivity by reducing an exchange time of a material or a color, by providing a retaining resin discharge device within a cylindrical die housing. CONSTITUTION:In the case where it is desirous of replacing old resin retained in the vicinity of opening parts of both ends of resin passage 42 following an exchange of materials or colors, a fine hole of a connecting part 36 is kept at a blockaded state by moving a needle bar 42 forward by feeding hydraulic oil or compressed air to a cylinder 35. Then at a stage when molten resin extruded through an extruding machine and fed to a die 1 is caused to flow down through a resin flow path 14 and dangling is begun, the hydraulic oil or the compressed air is fed once, a needle bar 32 is moved backward and the fine hole of the connecting part 36 is released. A series action like this is repeated intermittently, through which retaining resin at a position where it is apt to retain most is eliminated and the old resin is replaced shrewdly, quickly and completely with the fresh resin.