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US 6,649,097 B2Granted
Method of making a gasket for layer-built fuel cells
AssigneeNok Corporation
InventorsYasunori Sasaki, Kazuhisa Senda, Osamu Nagai, Shigeo Wakamatsu, Osamu Ando, Tasashi Fujimoto
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Abstract
A gasket is provided on a porous sheet in one body. The gasket is thin and has an excellent sealability, and processability when the gasket is built in layer-built fuel cells. The gasket is made of liquid rubber and has a hardness not more than 60 (JIS A). Liquid perfluoro rubber and liquid silicone rubber is preferably used for the gasket. And gasket can be made by injection molding.
Claims4
A method for making a gasket on a sheet for a layer-built fuel cell, said method comprising the steps of;
- preparing at least two molds having a groove by which the gasket is formed, wherein the molds have a sealing means around a peripheral portion thereof, a passage through which air can flow out of the molds and an inlet on one of the molds through which the liquid rubber can flow into the groove,
- placing a porous carbon sheet between the two molds and closing the molds so that the sealing means on one of the molds contacts a surface of the other of the molds,
- closing the inlet by a closing means installed in a tip of an injection nozzle so as to make a closed space closed by an o-ring and by the tip,
- sucking air out from the closed space until a degree of vacuum reaches a predetermined value, and
- injecting liquid rubber into the molds;
- the injection molding being carried out at an injection pressure within a range of about 2 to about 30 Mpa.
3 more elements
Dependencies are inferred from the claim text.