| 摘要 |
PROBLEM TO BE SOLVED: To provide a packing film providing a bag which will not come out of its pile when stacking in automatic filling and packaging and does not emit noticeable noise when sliding each other. SOLUTION: Surface layer of this film (to be outside of the bag) has a Beck Index of 80-300 see, and surface roughness (JIS B-0601); arithmetical mean deviation of the profile at center surface (SRa) is 1.3-6.0μm, height of the profile irregularities in ten points (SRz) is 15-40μm, max. profile peak height at center surface (SRd) is 5-20μm, max. profile valley depth at center surface (SRv) is 7-20μm, and surface roughness at center surface (SGr) is 60-100 DOT, and static friction coefficient in vertical direction between surface layers is 0.40-0.80, dynamic friction coefficient in vertical direction between surface layers is 0.30-0.70, and the difference of static and dynamic friction coefficients is not lower than 1.0.
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