| 摘要 |
PROBLEM TO BE SOLVED: To provide a kraft paper bag, which prevents the occurring of fine powder of paper material or thread by doing away with a perforated seam formed on the bottom of a kraft paper bag, enables the automatic discharge of residual gas from the paper bag upon filling it with contents, and remain strong as much as a paper bag with a perforated seam. SOLUTION: A bottom paper slightly longer than the lower end of a bag is bent to have a longitudinal section of V-shape, and is stuck to the lower end of the bag with an adhesive. The ear of the bottom paper is projected at both sides of the lower part of the bag so as to form a gap between the bottom of V-shaped bottom paper and the lower end of the bag, and gaps between both sides of the lower part and the ear, with the gaps made communicate with each other as micro leak gaps for the gas inside the bag. COPYRIGHT: (C)2004,JPO
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