Patent ID: 8313815

Claim:
A tube comprising: a cylinder-shaped substrate layer that makes up a main body of the tube; and a linear projecting portion that extends straight along an entire axial length of the tube in an axial direction, the linear projecting portion being positioned on an outer surface of the cylinder-shaped substrate layer, wherein an outer layer is laminated on the cylinder-shaped substrate layer to form the tube; the linear projecting portion that extends straight along the entire axial length of the tube in an axial direction is raised on the outer layer to form a convex shape without concave portions on the outer layer; a thickness of the tube on either side of the linear projecting portion is equal, and less than a thickness of the tube at the position of the linear projecting portion such that the tube is bendable and as a result foldable at portions to either side of the linear projecting portion; and the tube is cut to a given length, flattened and sealed at at least one end.