| 摘要 |
PROBLEM TO BE SOLVED: To surely perform venting in a molding die. SOLUTION: A molding die with a cavity 6 whose outer periphery is approximately circular has a vent passage provided with a plurality of the first hole parts 8 formed along approximately radial direction and communicated with the cavity 6 and the second hole parts 10 each having an approximately circular arc shape and whose one end being the outlet side communicates with the outside and is connected with a plurality of the first hole parts 8 and the first hole parts 8 are inclined in such a way that the positions of connecting parts between the first hole parts 8 and the second hole parts 10 approach to the outlet sides of the second hole parts 10 to the straight lines passing through the center of the cavity 6 and the openings of the first hole parts 8 to the cavity 6. It is possible thereby to surely perform venting in the cavity 6.
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