HOLLOW ELASTIC BODY AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of a hollow elastic body which is used as an exterior object of an elastic pole, a cone type signage implement, and the like and which can give a color coding pattern easily and to provide the hollow elastic body which can assure visibility which is excellent over a long period of time. SOLUTION: Unvulcanized rubbers colored in different colors are extruded in the shape of a string respectively from different extrusion molding machines. These rubber strings 9 and 14 are put in parallel and twisted around the periphery of a mandrel 10 spirally so that the hollow body of unvulcanized rubber is formed, and the vulcanizing molding of this body is carried out. COPYRIGHT: (C)2005,JPO&NCIPI