THE BOTTOM PATCH STRUCTURE OF A BAG

摘要

A bottom patch structure of a bag is provided to prevent a bottom patch from being torn out in separating the bottom patch from a bag body by making an inner sheet of materials having a smooth surface or tough property. Front and rear long sides of one of upper and lower openings of a bag body including a paper bag are folded with overlapping. Or, the front and rear long sides are overlapped and an overlapped part is bonded, and then a bottom patch(30) is attached on the overlapped part. The bottom patch has at least two-fold structure formed by laminating inner and outer sheets(32,31) with different material properties in an overlapping state. At least the inner sheet is made of materials with a smooth surface or tough property.