| 摘要 |
<p>A method for manufacturing easily and reliably a double-wall corrugated tube. A double-wall corrugated tube (1c) is manufactured by extrusion of a thermoplastic resin, the tube comprising an insertion mouth (3) at one end and a socket portion (2b) at the other end, an outside wall (6), and an inside wall (7). The outside wall (6) has a continuous uneven shape, and the inside wall (7) has a tubular shape. The method comprises at least a fist cutting step and a second cutting step. In the first cutting step, a series of double-wall tube bodies (1a), extruded with the socket portion 2b (2a) and the insertion mouth (3) being connected together, is cut at an outside wall portion (X) that corresponds to an end part of the socket portion (2b) and at an outside wall portion (Y) that corresponds to an end portion of the insertion portion (3). In the second step, a cutting unit (U) is inserted into an inside hollow portion (9) up to a predetermined position from an opening portion on the socket (2a) side of a double-wall single tube body (1b) produced in the first step, and the inside wall (7) is cut in the circumferential direction while butting a cutter (Cz) projecting from the cutting unit (U) against an inside wall portion (Z) at which the socket portion (2a) starts.</p> |
