Method of producing endoscope flexible tube and method of producing endoscope
To provide a method of producing an endoscope flexible tube and the like which can realize an endoscope with high insertability. A method of producing the endoscope flexible tube including: continuously discharging a liquid resin into a film shape from an annular discharge port surrounding an axis and a side surface of a cylindrical substrate; bringing the discharged film-shape resin into contact with the entire periphery of the substrate on the downstream side of the discharge port; covering a side surface of the substrate with the resin while moving the substrate in an axial direction to separate a portion where the resin and the substrate are in contact from the discharge port; and curing the resin covering the side surface of the substrate.
1. A method of producing an endoscope flexible tube, the method comprising:
continuously discharging a resin in a liquid state into a film shape from an annular discharge port surrounding an axis and a side surface of a cylindrical substrate having air permeability on the side surface;
bringing the resin discharged into the film shape into contact with an entire periphery of the substrate on a downstream side of flow of the resin with respect to the discharge port;
covering a side surface of the substrate with the resin while moving the substrate in an axial direction to separate a portion where the resin and the substrate are in contact from the discharge port;
setting pressure surrounding a side surface of the substrate, which is not covered by the resin, to a negative pressure as compared to a surface of the resin in a cured state;
detecting when a hole is opened in the resin discharged into the film shape based on a pressure at an area set to the negative pressure; and
curing the resin covering the substrate.
2. The method of producing the endoscope flexible tube according to claim 1 , wherein
the resin is in a state where a plurality of resin materials are stacked.
3. The method of producing the endoscope flexible tube according to claim 2 , wherein
the resin is a thermoplastic resin, and
the substrate has a spiral tube, obtained by spirally winding a metal plate, and a reticular tube covering an outer side of the spiral tube.
4. The method of producing the endoscope flexible tube according to claim 2 , wherein
a space is present between the resin discharged from the discharge port and the substrate.
5. The method of producing the endoscope flexible tube according to claim 4 , wherein
the resin is a thermoplastic resin, and
the substrate has a spiral tube, obtained by spirally winding a metal plate, and a reticular tube covering an outer side of the spiral tube.
6. The method of producing the endoscope flexible tube according to claim 1 , wherein
a space is present between the resin discharged from the discharge port and the substrate.
7. The method of producing the endoscope flexible tube according to claim 6 , wherein
the resin is a thermoplastic resin, and
the substrate has a spiral tube, obtained by spirally winding a metal plate, and a reticular tube covering an outer side of the spiral tube.
8. The method of producing the endoscope flexible tube according to claim 1 , wherein
the resin is a thermoplastic resin, and
the substrate has a spiral tube, obtained by spirally winding a metal plate, and a reticular tube covering an outer side of the spiral tube.
9. A method of producing an endoscope, the method comprising:
continuously discharging a resin in a liquid state into a film shape from an annular discharge port surrounding an axis and a side surface of a cylindrical substrate having air permeability on the side surface;
bringing the resin discharged into the film shape into contact with an entire periphery of the substrate on a downstream side of flow of the resin with respect to the discharge port;
covering a side surface of the substrate with the resin while moving the substrate in an axial direction to separate a portion where the resin and the substrate are in contact from the discharge port;
setting pressure surrounding a side surface of the substrate, which is not covered by the resin, to a negative pressure as compared to a surface of the resin in a cured state;
detecting when a hole is opened in the resin discharged into the film shape based on a pressure at an area set to the negative pressure;
producing an endoscope flexible tube by curing the resin covering the side surface of the substrate; and
using the endoscope flexible tube for an exterior of an insertion unit.