| 摘要 |
PURPOSE: To provide an inner bag into which granules can be placed smoothly and whose inlet opening has the neck base hard to tear. CONSTITUTION: A cylindrical body 2 in a predetermined size is folded double and is further folded inwardly along imaginary lines (a) or two sheets of strip- like film previously doubled are held between two sheets of strip-like film spread out and the side edges of the films are arranged in coincidence and fused together into a cylindrical body 3. The faces opposite each other at each of the upper and the lower parts of the cylindrical body are fused together along the broken lines inwardly curved with an suitable curvature and outside parts are cut off. |
