| 摘要 |
PURPOSE:To make it possible to continuously effect extrusion molding of a plurality of hollow sections whose sectional shapes and circumferential length are greatly different during a series of extrusion molding by the design of a portion of extrusion molding port of a molding die to stabilize the fluidity of raw rubber with respect to the changes of sectional shape of molded article. CONSTITUTION:A base molding die Da and a flexible molding die Db are disposed in series in an extruding direction so that the inner circumferential surfaces of both dies are connected to each other. The die Db is tapered inwards from the base end of the die toward the forward end thereof so that it can be elastically deformed. During a series of extrusion molding, tensile forces in different directions are exerted on the forward end of the die Db to expand this end or these forces are released to restore the original shape thereof. |
