| 摘要 |
PURPOSE:To prevent generation of a rent of structure on the peripheral edge of a bag by forming a bag main body part into a circular shape or an elliptical shape through changing the weaving width in weaving process of the bag, and constituting the bag out of a seamless bag body of a tough twist together structure in which the woof is fold back on the peripheral edge part. CONSTITUTION:A seamless bag body 11 constituting a main body part 1 of a bag is formed into a circular shape or an elliptical shape by changing the weaving width in weaving process of the bag. The seamless bag body 11 is formed by putting in the woof accompanied with periodical changing of the width of arranged warp. In this case, joining points 11a at which the upper layer and the lower layer of the seamless bag body 11 are joined together are formed on both ends in the weaving width direction. According to size of the weaving width, the number of warp put in the weaving structure is increased or decreased to adjust the warp density. Further, it is desirable that high polymer coating 12 is provided at least on one part of the surface of the seamless bag body 11 to add air antipermeability. A gas introducing port 2 is provided on one side of the main body part 1. |
