Abstract: A method of producing a synthetic resin made article having a porous elastic member, which is useful as an air duct opening/closing damper adaptable in air conditions for automobiles, including the steps of:placing a porous elastic member in position against the inner wall surface of one of the opposing segments of an injection mold splittable into two or more segments;closing said injection mold and compressing said porous elastic member by the clamping pressure;casting a synthetic molding resin along the surface of said porous elastic member; andapplying a dwell pressure of a preset level for a prescribed period of time to the synthetic resin injected into said mold, anda method of producing a synthetic resin made article having porous elastic members, which is useful as an air duct opening/closing damper adapted in air conditions for automobiles, which includes the steps of:placing the porous elastic members in position against the inner wall surfaces of each pair of opposing segments of an injection mold

Abstract: An air-flow control valve of the structure in which a soft foamed sheet (2) is joined to one or both surfaces of a valve body (1) made of a synthetic resin as a unitary structure via a sheet (3) for preventing the oozing of resin. The ooze-preventing sheet (3) is stuck with an adhesive or the like onto one surface of the soft foamed sheet (2) in advance, and a synthetic resin for forming the valve body (1) is placed on the stuck surface of the foamed sheet (2). Or, another foamed sheet (2) with its sticking surface being on the lower side is further placed thereon, followed by stamping. Therefore, the foamed sheet (2) is not peeled off, and the air-flow control valve exhibits sufficient buffer function against the rigid valve body (1).