| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a double paper tube which can be constituted to be lighter in weight than before and can simplify a manufacturing process.SOLUTION: A double paper tube 100 includes a lateral surface body 104 and a laying body 110 between a cylindrical inner paper tube 101 and a cylindrical outer paper tube 102 arranged outside the inner paper tube 101 via a space part 103. The lateral surface body 104 is a component for connecting the inner paper tube 101 and the outer paper tube 102 while covering respective opening parts 103a in both end parts of the inner paper tube 101 and the outer paper tube 102, and is constituted of an inner lateral surface body 104a arranged inside and an outer lateral surface body 104b arranged outside. The laying body 110 is a component arranged in the space part 103 for integrally connecting the inner paper tube 101 and the outer paper tube 102 besides the lateral surface body 104 and is laid between the two lateral surface bodies 104 provided on both end parts of the space part 103. The laying body 110 is constituted by assembling four small pieces 111 made of a plate-like body in a parallel-cross shape.</p> |
