| 摘要 |
PROBLEM TO BE SOLVED: To facilitate to grasp insert members from the outside and to take them out when a hollow double wall structure is discarded and to surely classify a plastic material and a metal material. SOLUTION: A hollow double wall structure 1 is constituted of a surface wall 2, a back wall 3 facing the surface wall 2 at an interval and surrounding walls 4 forming a hollow part between the surface wall 2 and the back wall 3. An insert member in a continuous length being prepd. by sheathing a metal body in a continuous length with a plastic cylindrical body is inserted between facing surrounding walls 4. The end faces of the insert member 7 on the facing surrounding walls 4 are exposed outside. The insert member 7 is held on the back wall 3 by surrounding it with the surrounding walls integrally connected with the back wall 3. |
