To freely form a bag body through the heat bonding according to the situation at site without the bag body, and to enable the execution according to the shape at site by forming the bag body using a cloth of composite synthetic fibers consisting of at least two kinds of synthetic resin having a larger difference in melting point than a specified value.
This bag body is formed of a cloth of composite synthetic fibers consisting of at least two kinds of synthetic resin different in melting point by at least 10°C or under. The composite synthetic fibers are formed by combining at least two kinds of synthetic resin different in melting point by 10°C or over, including the combination of polymers completely heterogeneous from each other, the combination of polymers having the same bonds by a method such as the copolymer, and the combination of the copolymerized optical isomer with the single polymer. The structure includes one in which a synthetic resin layer lower in melting point is partly exposed outside the fiber, such as a core-sheath structure. The bag body can be formed through the bonding between threads or between fibers to constitute the cloth.
MIWA MASAHIKO
MORIGUCHI YOSHIFUMI
KARATO YOSHINORI
