| 摘要 |
A synthetic resin hose includes a corrugated tube wall and an electrically conductive wire disposed substantially straight along the axial direction of the tube wall and configured so that the whole length of the electrically conductive wire on the inner circumferential surface side thereof is covered with the tube wall and the outer circumferential side thereof is enclosedly covered with only top portions of the tube wall. A producing method of the hose comprises the steps of: using a mold assembly constituted by a pair of semicylindrical molds each having a large number of intrusion grooves formed along the axial direction in the cylindrical surface of each of the semicylindrical molds substantially at regular intervals and supplying electrically conductive wire into the hose molding mold assembly substantially linearly along the axial direction of the mold assembly; extruding a molten resin tubularly to supply the molten resin into the mold assembly after the supply of the electrically conductive wire; supplying high-pressure air into the inside of the thus extruded molten resin tube to thereby expand the molten resin tube along the corrugated surface of the mold assembly to bring the molten resin tube into contact with the corrugated surface of the mold assembly and, at the same time, making a part of the tube go around to the outer circumferential surface side of the electrically conductive wire along the intrusion grooves of the mold assembly to thereby enclose the outer circumferential side of the electrically conductive wire; cooling the molded resin tube to retain the shape of the tube; and opening the mold assembly so that a hose body integrated with the electrically conductive wire is taken out from the mold assembly.
|
