Steel cord having flat side surface portion, method of manufacturing same, and pneumatic tire reinforced with same
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United States of America Patent
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-
Jul 30, 2002
Grant Date -
N/A
app pub date -
Mar 24, 2000
filing date -
Sep 25, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Steel cord is manufactured by: forming a plurality of bends, per filament length equivalent to one twist pitch, on each of filaments which constitute an outer layer sheath, with the filament length equivalent to one twist pitch being a cycle; twisting these filaments while the bends belonging to the same phase are aligned in a cord axial direction; and subjecting cord side surfaces to compression processing. As a result, flat side surface portions are formed, in which a plurality of filaments forming the outer layer sheath are positioned substantially in the same plane. The steel cord thus formed is used in reinforcement plies for pneumatic radial tires such that the reinforcement plies are laminated in a manner in which the flat side surface portions are mutually parallel.
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