| 摘要 |
PROBLEM TO BE SOLVED: To obtain a kraft paper having extremely low transparency useful for a heavy-duty bag for packing fine powdery particles by air transportation. SOLUTION: This kraft paper comprises a kraft paper made from a kraft pulp as a raw material. The kraft paper constitutes a multilayer bag for packing fine powdery particles by air transportation, satisfying strength (tensile strength) described in JIS P 3412 (1, extensible paper) and JIS P 3401 (kraft paper 1, 2) having 73-84 g/m2 unit weight. The paper has 4-10 second air permeability by JIS P 8117.
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