| 摘要 |
<p>The present invention relates to a double wall pipe made of a synthetic resin composition having anti-corrosion and durability comprising: a main body unit which periodically forms an outer wall having the concave portion and convex portion along the longitudinal direction responding to an O-ring phenomenon, has an inner wall of a pipe shape by being integrally combined at the base of the convex portion in the outer-wall and the inner and outer wall in one side of the double wall pipe; a socket unit which is integrally formed from the other sides of the double wall pipe to the main body unit and has an inner wall and an outer wall which are relatively bigger than a diameter of the main body unit; a plurality of slit units which extends along the longitudinal direction of the inner wall in the socket unit and the main body unit, is open from both ends of the inner wall in the main body unit and the socket unit, is spaciously disposed in circumferential direction of the double wall pipe; and a double extrusion unit which is integrally combined through being filled in the slit unit during double extrusion molding of the inner wall and consists of a different synthetic resin material for relatively reducing frictions compared to the synthetic resin material of the inner wall.</p> |
