| 摘要 |
PROBLEM TO BE SOLVED: To provide an extrusion mold not having possible inconvenience such that a deposit due to so-called build-up phenomenon is bonded to the periphery of an extrusion port. SOLUTION: In an extrusion mold constituted so that a mandrel 12 is provided in an outer mold 11 and an annular resin passage 13 is provided between the outer mold 11 and the mandrel 12 and a resin is extruded from the annular extrusion port 14 provided between the leading end surface of the outer mold 11 and the leading end surface of the mandrel 12, circular arc surfaces 111, 121 are provided to the corner part of the peripheral edge of the extrusion port 14 provided to the leading end surface of the outer mold 11 and the corner part of the peripheral edge of the extrusion port 14 provided to the leading end surface of the mandrel 12.
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