| 摘要 |
PROBLEM TO BE SOLVED: To lower a disposal amount of plastic waste by forming an inside face layer of a tube of a material including no recycled plastic, bringing an outside face of a joint made of a material including no regenerated plastic into contact with the inside face of the tube, and sealing a clearance between the joint outside and the tube inside face. SOLUTION: In this connection structure, multilayer tubes 2, 3 are arranged with their end parts 2a, 3a arranged concentrically, and each of the multilayer tubes 2, 3 has a triple-layer structure by forming synthetic resin layers 6, 7 by extrusion molding on the inside and the outside of a regenerated plastic layer 5 respectively. For the regenerated plastic layer 5 in the middle, plastic waste is dissolved so as to be reused. The synthetic resin layers 6, 7 on the inside and the outside of the regenerated plastic layer 5 are formed of virgin plastic material including no regenerated plastic. The outside face of a joint 4 made of a material including no regenerated plastic is brought into contact with the inside faces of the multilayer tubes 2, 3, and clearances between the outside face of the joint 4 and the multilayer tubes 2, 3 are sealed by means of sealing means 11.
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