| 摘要 |
PROBLEM TO BE SOLVED: To obtain a gland packing which exhibits a low sliding resistance and good sealing properties by incorporating a humectant and a lubricant (e.g. paraffin) into an expandable graphite packing comprising expandable graphite or a composite thereof with reinforcing fibers (e.g. metal fibres). SOLUTION: A sheet of expandable graphite or of a composite of expandable graphite with reinforcing fibers (e.g. metal fibers) is cut into a certain width; thus obtd. tape-like material is spirally arranged in a metal mold and then press-molded in the longitudinal direction to give a ring-shape expandable graphite gland packing; and this gland packing is immersed in a liquid contg. equal amts. of a humectant and a lubricant selected from among turbine oils, silicone oils, paraffin waxes, paraffin emulsions, etc., to give a gland packing contg. the humectant and the lubricant attached thereto, each in an amt. of 0.1 wt.% or higher. The humectant absorbs the atmospheric moisture and prevents water at the packing surface from vaporizing, and its examples are glycerin, ethylene glycol, glycine, soluble collagen, polypeptides, and sodium hyaluronate. |
