| 摘要 |
PURPOSE:To improve the durability of a tire by such an arrangement wherein a piece of synthetic fiber filament is used as a core strand, and a covering layer made of organic high polymer is provided only around the core strand, and further steel filaments are wrapped around the outer circumference of the core strand, etc. CONSTITUTION:A core strand 6 is composed by forming a covering layer 6b made of organic high polymer around the outer periphery of a piece of synthetic fiber filament 6a and 4 pieces of side strand 7 made of steel filament are wrapped around the outer periphery of the core strand 6 and free spaces 8 are formed between side strands 7. By this arrangement wherein wires are stranded so that they are not brought to tightly contact each other and sealed voids are not generated inside the strand, such a trouble can be avoided that rubber is filled up and water penetrates into the strand along voids. Consequently, steel cords are prevented from becoming rusty. |
