Patent ID: 7833003

Claim:
An in-mold gas vent structure, comprising: a sliding member that receives, from an opposite side, an impelling force exerted by an elastic member and that includes a bottomed hole, formed in a direction in which a molten material flows, and at least one side opening, communicating with the bottomed hole and being open in a direction transecting the direction in which the molten material flows; and a sliding member acceptor that slidably accepts the sliding member in a direction parallel to the direction in which the molten material flows, and that includes a gas vent port, which communicates with the side opening of the sliding member in the initial state, in which there is no pressure influence resulting from the flow of molten material, and is closed when the sliding member is thereafter impelled inward, compressing the elastic member, by the leading end of the molten material, characterized by being suitable for being mounted in a space defined by a cavity plate and a core plate, or along a molten material flow passage connected to the space, or near the trailing end thereof.