| 摘要 |
The present invention relates to a structural material for a gland packing, which can be used favorably as a gland packing in a spiral or annular form, and which exhibits extremely good sealing performance. The structural material for a gland packing is a braided cord 8 comprising a plurality of knitting yarns braided in a spiral. In this braided cord 8, elastic yarns 51c that have higher elasticity than the knitting yarns and extend in the lengthwise direction of the braided cord 8 without being intertwined with the knitting yarns are disposed in a penetrating fashion in at least a braid layer portion 8A that is on an outer peripheral surface 8b side of a reference plane X-X that passes through the cross sectional center 80 of the braided cord 8 and is parallel to the inner and outer peripheral surfaces 8b and 8c of the braided cord 8. The plurality of elastic yarns 51c are disposed in a cross section of the braided cord 8 in an aligned state parallel to the outer peripheral surface 8b of the braided cord 8. The cross sectional shape of the braided cord 8 is square, and core yarns 51a and 51b that extend in the lengthwise direction of the braided cord 8 without being intertwined with the knitting yarns are disposed in a penetrating fashion in the comers of the square shape. |
