Method of manufacturing foam molded product, apparatus for manufacturing foam molded product, and foam molded product
The present invention is an apparatus for manufacturing a foam molded product in which a foam molded product ( 1 A, 1 B) is formed by integrally adhering together a foam body ( 2 ) that is formed by the foaming of a foaming raw material, and an air-permeable component ( 3 ). A cavity ( 23 ) is provided between a plurality of mold components ( 21, 22, 31 ) and is defined by respective cavity surfaces ( 21 a, 22 a, 31 a ) of the mold components ( 21, 22, 31 ).
1. An apparatus for manufacturing a foam molded product formed by integrally adhering together a foam body formed by the foaming of a foaming raw material and an air-permeable component, the apparatus comprising a plurality of mold components including a top mold and a bottom mold that define a mold cavity therebetween, wherein
a cavity surface of the bottom mold is configured to receive the foaming raw material injected into the mold cavity,
an aperture cavity surface of the top mold having gas venting holes defined therein,
wherein the mold cavity is defined by the cavity surface of the bottom mold and an inner side of a peripheral edge portion of the aperture cavity surface, and includes:
a foaming start space to which the foam raw material is supplied, and
a foaming end space that is disposed between the top and bottom molds in an area other than the foaming start space and is defined by the peripheral edge portion of the aperture cavity surface and is continuous with the foaming start space, and that is filled by the foam raw material inside the foaming start space performing a foaming action so as to spread as far as the foaming end space, and
a concave gas escape groove formed in the peripheral edge portion of the aperture cavity surface,
wherein a depth of the concave gas escape groove is less than a thickness of the top mold so as not to penetrate through the top mold.
2. The apparatus according to claim 1 , wherein
the concave gas escape groove is disposed at a distance from the peripheral edge portion of the aperture cavity surface, the peripheral edge portion of the aperture cavity surface being continuous with a parting surface.
3. The apparatus according to claim 2 , wherein
the parting surface comprises mutually abutting parting surfaces of the top and bottom molds, with a sealing component interposed therebetween.
4. The apparatus according to claim 1 , wherein
the air-permeable component is disposed so as to cover the concave gas escape groove and the gas venting holes, and the air-permeable component, the concave gas escape groove and the gas venting holes are disposed so that, in the foaming, foam gas is expelled from the gas venting holes via the concave gas escape groove and the air-permeable component.
5. The apparatus according to claim 1 , wherein
the concave gas escape groove extends in a direction in which the foaming of the foam raw material advances from the foaming start space towards the foaming end space.