| 摘要 |
PROBLEM TO BE SOLVED: To solve the following problem of conventional multilayer paper bags: the paper bags undergoing bending or deforming habits occur on the order of 3 % after transportation of about 600 Km due to their over size under the circumstances that each multilayer paper bag formed of kraft paper has its bottom folded back twice and sealed with patch paper having an unsealing tape in normal times, because the bottom serves as a contents ejection port, and that all the paper bags are divided into a predetermined number of paper bag groups and then stacked on each other in 25 layers, for instance, on a transportation pallet. SOLUTION: According to a present multilayer paper bag, a bottom closed portion is formed by firmly enclosing a folding portion at a lower end of a cylindrical body with patch paper equipped with an unsealing means. At the bottom closed portion, a layer forming an innermost cylindrical body is formed as a non-cut layer having a folding portion, then a layer forming an outermost cylindrical body is formed as a cut layer whose forward end is cut and removed so as to be shorter in length than the folded portion, and a layer forming an intermediate cylindrical body between the innermost and outermost cylindrical bodies is formed as another non-cut layer or cut layer similarly to the aforementioned non-cut layer or cut layer. COPYRIGHT: (C)2004,JPO&NCIPI
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