Patent ID: 6920691

Claim:
A method of manufacturing a multi-cell tube, comprising: a material preparation step of preparing a preformed cylindrical synthetic resin material or a cylindrical synthetic resin material formed by bonding both ends thereof; a folding step of preparing a portion ( 40 ) for defining a three-dimensional structure by inwardly folding and inserting one side end of the cylindrical material into the remaining portion thereof after flatly folding the cylindrical synthetic resin material prepared in the material preparation step, and preparing portions to be formed into the supply tube unit ( 20 ) and the operating tube unit ( 30 ) by inwardly folding and inserting the other side end of the cylindrical material into the remaining portion thereof; a division step of forming division line sections having inlets along a direction in which the cells are arranged so that the supply tube unit and operating tube unit prepared in the folding step can be formed, and repeatedly forming partition line sections along a direction intersecting with the direction in which the cells are arranged; and a valve attachment step of attaching opening/closing valves to one side ends of the supplying tube unit and the operating tube unit prepared in the division step, respectively, and sealing opposite side ends of the units.