| 摘要 |
PROBLEM TO BE SOLVED: To provide an NA joint sheet that has a good compressibility and stress relaxation and can be used for a long time. SOLUTION: The objective NA joint sheet is produced by charging base fibrous materials other than asbestos, rubber, fillers, rubber additives and the like between the hot roller and the cold roller and laminating the sheet substance on the hot roller side where rock wool of 4-9μm fiber diameters is included in the joint sheet in an amount of 25-55 wt.%.
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