| 摘要 |
<P>PROBLEM TO BE SOLVED: To properly hold molding pressure in a cavity 3 when filling a molding rubber material 4, and to effectively prevent defective molding. <P>SOLUTION: A base material 11 is set and clamped between split molding dies 22, 23 of a molding die 2, the molding rubber material 4 is injected into the cavity 3 of endless shape defined between a surface of the base material 11 and an inner face of the split molding die 22 opposed thereto, an injection amount thereof is set to such an amount that the molding rubber material flows from an air vent hole 36 opened in a confluence position 3a of the molding rubber material 4 in the cavity 3 into an excessive material reservoir 38 provided in the downstream of the air vent hole, and that the excessive material reservoir 38 is not filled therewith, after the cavity 3 is filled with the molding rubber material 4, the lowering of pressure caused by flow resistance is generated in the molding rubber material 4 flowing from the air vent hole 36 into the excessive material reservoir 38, and pressure in the cavity 3 is maintained due to the lowering of the pressure at a lower limit value or larger of pressure required to mold a gasket 12 and smaller than a lower limit value of pressure at which leakage from the cavity 3 occurs. <P>COPYRIGHT: (C)2011,JPO&INPIT |
