| 摘要 |
PROBLEM TO BE SOLVED: To provide a raw paper for paper yarn mainly composed of a natural fiber, having strength even in low basis weight, preventing occurrence of paper cut trouble in slit processing and having good texture. SOLUTION: The raw paper for paper yarn is mainly composed of a natural fiber and has 5-40 g/m<SP>2</SP>basis weight. In the raw paper for paper yarn, Runkel ratio of the natural fiber is≤2.5 and the ratio of a fraction having≥5 mm length weight fiber length distribution is≤20% and length weight average fiber length is 2-4 mm and fiber roughness of natural fiber is≤30 mg/100 m and the natural fiber is Manila hemp. The raw paper for paper yarn has≥8 ratio of tensile strength in the horizontal direction to tensile strength in the vertical direction and≥110 m tear strength in vertical direction. COPYRIGHT: (C)2007,JPO&INPIT
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