| 主权项 |
1. A coating nozzle for high-viscosity paint, the coating nozzle comprising:
an introduction passage, an internal space, and a nozzle slit that communicate with each other and are disposed in this order so as to supply a high-viscosity paint to the internal space through the introduction passage, and so as to reserve the high-viscosity paint temporarily in the internal space, the high-viscosity paint being discharged from the nozzle slit while spreading radially, and then being blown onto an object to be coated; the nozzle slit including a nozzle-slit inlet on the internal space and a nozzle-slit outlet on a paint-discharge leading-end side, and being formed as a substantially-sector-shaped trapezoid that has a dimension expanding from the nozzle-slit inlet to the nozzle-slit outlet in a width-wise direction; the nozzle-slit outlet being formed as an arc shape that has opposite ends and an imaginary chord connecting the opposite ends one another linearly; the nozzle slit having a slit width that is made of the imaginary chord, and converging from the nozzle-slit outlet side to the nozzle-slit inlet side while heading toward an imaginary apex being held between two equilateral sides of an imaginary isosceles triangle whose base is the imaginary chord and whose base angles are a predetermined slit angle being less than 45 degrees; the arc-shaped nozzle-slit outlet exhibiting a radius ratio that is a value being obtained by dividing a second radius by a first radius, and which is greater than 1 when a first distance between the imaginary apex of the imaginary isosceles triangle and each of the opposite ends of the imaginary chord is labeled the first radius and a second distance between the imaginary apex of the imaginary isosceles triangle and a central point in a width-wise direction of the arc-shaped nozzle-slit outlet is labeled the second radius; and the nozzle-slit outlet having, when being viewed on the paint-discharge leading-end side, a slit opening area that makes a shear velocity of the high-viscosity paint, which passes through the nozzle-slit outlet, fall in a range of from 5,000 to 20,000 s−1 for a discharge rate of from 3,000 to 10,000 c.c./minute of the high-viscosity paint. |
