Steel cord
AssigneeNV Bekaert SA
InventorsYuping Wang, Tao Huang
Life of this patent
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Abstract
The invention provides a steel cord for rubber reinforcement. The steel cord comprises a core strand and at least three outer strands twisted around the core strand, the core strand comprises at least one first core filament and multiple first outer filaments twisted around the first core filament, each outer strand comprises a number of second filaments, at least one of multiple first outer filaments is preformed prior to being twisted into the core strand, and at least one of second steel filaments is straight prior to being twisted to form each outer strand. The steel cord has improved performance on core filament migration.
Claims9
A steel cord for rubber reinforcement, said steel cord comprising a core strand and at least three outer strands twisted around said core strand, said core strand comprising at least one first core filament and multiple first outer filaments twisted around said at least one first core filament, each said outer strand comprising a number of second filaments, wherein at least one of said multiple first outer filaments is preformed prior to being twisted into said core strand, and at least one of said a number of second steel filaments is straight prior to being twisted to form each said outer strand, wherein the preformed first outer filament comprises continuous waves A and continuous waves B along its length, said wave A is different from said wave B in wave height, said wave A has a wave height ranging from 1.05×d1 to 4×d1 in mm, d1 being the diameter of said first outer filament, said wave B has a wave height ranging from 0.5×D1 to 1.5×D1 in mm, D1 being the diameter of the enveloping circle of said first outer filaments.
Dependencies are inferred from the claim text.