Uncoated Krafliner paper, unbleached, in rolls or sheets, weighing more than 115g/㎡ but less than 360g/㎡(tightness more than 0.68g/cm3, burst index not smaller than 2.6kPa·㎡/g, cross-direction ring crush Index not smaller than 7.5N/ m·㎡/g cross-direction folding endurance not less than 60 times, other than saturated kraft paper)