| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To inexpensively and easily mold an envelope with a double structure concerning a method for manufacturing a flexible tube for an endoscope. <P>SOLUTION: In the first molding process, a soft resin 16 is discharged onto the outer peripheral surface of a flexible tube base material 14 by fixed extruding pressure, and also the carrying speed of the flexible tube base material 14 is controlled so as to allow the thickness of the soft resin 16 to be molded to be thinnest at the proximal end 14b of the flexible tube base material 14 and to be thickest at the distal end 14a in a tapered shape. In the second molding process, the front and back parts of the flexible tube base material 14 are reversely carried, and a hard resin 17 is discharged onto the outer peripheral surface of the flexible tube base material 14 by the fixed extruding pressure and also the carrying speed of the flexible tube base material 14 is controlled so as to allow the thickness of the hard resin 17 to be molded to be thinnest at the distal end 14a of the flexible tube base material 14 and to be thickest at the proximal end 14b in a tapered shape. Consequently, the envelope 15 with the uniform thickness is molded over the whole length of the flexible tube base material 14. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
