Annular seal material and manufacturing method
AssigneeValqua, Ltd.
InventorsNaoki Osumi, Tomomitsu Mochizuki
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Abstract
The present invention relates to an annular seal material comprising a core and an outer layer covering a periphery of the core, wherein the outer layer has a thick film portion and a non-thick film portion in a cross section in a circumferential direction. According to the present invention, provided are an annular seal material that is constituted of a core and an outer layer and that suppresses cracking in the outer layer and protrusion of the core from the outer layer, and a method for manufacturing the same.
Claims14
A method for manufacturing an annular seal material comprising a core and an outer layer covering a periphery of the core, wherein the outer layer has a thick film portion and a non-thick film portion in a cross section in a circumferential direction, the method comprising:
- a preforming step of providing one or two or more rope-like preforms comprising an uncrosslinked core made of a crosslinkable rubber composition for the core, and an uncrosslinked outer layer, made of a crosslinkable rubber composition for the outer layer, covering a periphery of the uncrosslinked core;
- removing the uncrosslinked core from two end portions of the rope-like preform;
- and
- a hot pressing step of contacting the two end portions of the rope-like preform with each other and placing the same in a mold to carry out hot press molding.
A method for manufacturing an annular seal material comprising a core and an outer layer covering a periphery of the core, wherein the outer layer has a thick film portion and a non-thick film portion in a cross section in a circumferential direction, the method comprising:
- providing one or two or more rope-like preforms comprising an uncrosslinked core made of a crosslinkable rubber composition for the core, and an uncrosslinked outer layer, made of a crosslinkable rubber composition for the outer layer, covering a periphery of the uncrosslinked core;
- heating only two end portions of the rope-like preform;
- and
- contacting the heated two end portions of the rope-like preform with each other and placing the same in a mold to carry out hot press molding.
A method for manufacturing an annular seal material comprising a core and an outer layer covering a periphery of the core, wherein the outer layer has a thick film portion and a non-thick film portion in a cross section in a circumferential direction, the method comprising:
- providing one or two or more rope-like preforms comprising an uncrosslinked core made of a crosslinkable rubber composition for the core, and an uncrosslinked outer layer, made of a crosslinkable rubber composition for the outer layer, covering a periphery of the uncrosslinked core;
- and
- contacting the heated two end portions of the rope-like preform with each other and placing the same in a mold to carry out hot press molding;
- wherein the method further comprises disposing a connecting member between the two end portions of the rope-like preform and placing the same in the mold in the hot press molding,
- the connecting member comprises an uncrosslinked core made of the crosslinkable rubber composition for the core, and an uncrosslinked outer layer, made of the crosslinkable rubber composition for the outer layer, covering a periphery of the uncrosslinked core, and the uncrosslinked outer layer of the connecting member is thicker than the uncrosslinked outer layer of the rope-like preform.
Dependencies are inferred from the claim text.