FLUORORESIN SEAL RING
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United States of America Patent
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Issued Date -
Jul 2, 2015
app pub date -
Jul 18, 2013
filing date -
Jul 25, 2012
priority date (Note) -
Abandoned
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Abstract
A PTFE resin seal ring in which at least one surface of an abutting part that forms a discontinuous part of the seal ring is treated by plasma modification using non-polymerizable gas under pressure conditions of 10 to 500 Pa during plasma irradiation. Since the abutting surfaces of the PTFE resin seal ring are treated with low-pressure plasma, and the state of CF bonds in the surface portion is changed, sticking does not occur in the abutting part even after constant load is applied at a high temperature. Thus, the PTFE resin seal ring of the present invention exhibits excellent effects of ensuring sealing properties under pressure and slidability under ordinary pressure, and is effectively used as a sealing material in, for example, rotation or reciprocation, including hydraulic circuits such as automatic transmissions (A/T) and continuously variable transmissions (CVT) for vehicles.
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