folding the plate shaped members 62 turn toward the mounting member 61 in the stated order the steam supply device 63 is a device for supplying steam to the flow channels in the mounting member 61 and the plurality of plate shaped members 62 and this device has a fluid storage tank 631 a heater 632 and a feed tube 633 as shown in fig2 the fluid storage tank 631 is a container capable of storing fluid and is placed above the rotation mechanism 64 the heater 632 is a device for vaporizing the fluid stored in the fluid storage tank 631 and is placed between the fluid storage tank 631 and the feed tube 633 the feed tube 633 is a member for feeding steam vaporized by the heater 632 to the flow channels of the mounting member 61 and the plurality of plate shaped members 62 and is formed from a pliable material so as not to be severed or the like even when the mounting member 61 and the plurality of plate shaped members 62 are caused to rotate a predetermined angle by the rotation mechanism 64 the rotation mechanism 64 is a mechanism for rotating the mounting member 61 and the plurality of plate shaped members 62 around an axis extending along the longitudinal direction of the mounting member 61 and is placed on the side of the mounting member 61 near the second end 61 b the rotation mechanism 64 has a rotation drive motor 641 a second transmission gear 642 a second transmission shaft 643 and a base plate 644 as shown in fig2 the rotation drive motor 641 is a member attached to the frame.