To provide a mold air-vent structure which can prevent a raw material from flowing into the back surface side of a valve element.
An inserting hole 5 is formed in the inner surface of a mold 1 and a cylindrical vent piece 3 is inserted into the hole. The central hole 3a in the vent piece 3 is structured as a part of a vent hole 2 for connecting the outside and the inside of the mold 1. A valve element 4 for opening and closing an inner opening of the central hole 3a is installed in the inner edge of the vent piece 3. The inner edge of the vent piece 3 is positioned in the rear place than the inner surface of the mold 1, and the valve element 4 is moved to the rear place than the inner surface of the mold 1. A non-vulcanized rubber around the valve element 4 is not flown into the back surface site (the outside) of the valve element 4 even when it is fluidized laterally.
YAGI KANAE
YAGI KANAE
Shuzo Hinode
Seiji Goto
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