Bagmaking and packaging device and tube member for bagmaking and packaging device

A bagmaking and packaging device comprising:

• a transverse sealing unit that transversely seals a packaging material formed into a tubular shape;
• a first tube member that is disposed above the transverse sealing unit, extends in an up and down direction, allows the packaging material to become wrapped around it to thereby form the packaging material into the tubular shape, and guides downward contents entering the first tube member from above;
• and
• an inert gas flow path member at least part of which is disposed inside the first tube member and is configured to deliver an inert gas into the packaging material formed into the tubular shape,
• wherein the first tube member includes a slot that extends in the up and down direction so that the inert gas rising in a space between the packaging material formed into the tubular shape and the first tube member flows en route through the slot to the space inside the first tube member;
• and
• wherein any transverse section of the first tube member where the slot is formed is closed C-shaped with exposed terminal edges of the walls of the first tube member on either side of the slot facing each other, and
• wherein a distance between the terminal edges of the walls which face each other is substantially constant along an entire length of the slot.