WE CLAIM:
1. A slot-type spray nozzle comprising:
a plurality of coating fluid discharge ports arranged
in one direction; and
5 a pair of air discharge ports continuously or
intermittently opened in a vicinity of the coating fluid
discharge ports in a width direction, the width direction
being the one direction, the air discharge ports being
arranged to sandwich the coating fluid discharge ports, the
10 air discharge ports being formed such that air discharged
from the air discharge ports obliquely intersects with a
discharge direction of coating fluid,
wherein the slot-type spray nozzle further includes a
pair of fluid holding surfaces extending in the discharging
15 direction of the coating fluid from sides forming both ends
in the width direction of the coating fluid discharge
ports, the fluid holding surfaces facing each other across
the coating fluid discharge ports, and
with a length of the fluid holding surfaces in the
20 discharge direction of the coating fluid denoted by H1
(µm), an angle (acute angle) formed by a discharge
direction of the air discharged from an air discharge port
and the discharge direction of the coating fluid denoted by
θ (degrees), and an interval between the coating fluid
25 discharge ports and the air discharge port denoted by L2
(µm),
H1 ≥ 30 µm and following Inequation (1) are satisfied:
(L2/tanθ) - 100 ≤ H1 ≤ L2/tanθ (1).
30 2. The slot-type spray nozzle according to claim 1,
wherein the coating fluid discharge ports are formed
of a comb-shaped shim and a pair of nozzle blocks clamping
32
WE CLAIM:
the comb-shaped shim,
the comb-shaped shim protrudes from distal ends of the
nozzle blocks in the discharging direction of the coating
fluid, and
5 the fluid holding surfaces are a part of a portion of
the comb-shaped shim, the portion protruding from the
nozzle blocks.
3. The slot-type spray nozzle according to claim 2,
10 wherein a surface of the portion of the comb-shaped shim
protruding from the nozzle blocks has fluid repellency
against water, the surface observable from a thickness
direction of the comb-shaped shim.
15 4. The slot-type spray nozzle according to claim 1,
wherein the fluid holding surfaces are substantially
orthogonal to the width direction.
5. The slot-type spray nozzle according to claim 1,
20 wherein a radius of curvature of a ridge line of a distal
end of each of the fluid holding surfaces is less than or
equal to 30 µm.
6. The slot-type spray nozzle according to claim 1,
25 wherein the L2 is less than or equal to 100 µm.
7. A coating device comprising:
the slot-type spray nozzle according to any one of
claims 1 to 6;
30 a supply unit configured to supply the coating fluid
and the air to the slot-type spray nozzle;
a support unit configured to support a to-be-coated
member; and
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a moving unit configured to relatively move the to-becoated member supported by the support unit with respect to
the slot-type spray nozzle.
5 8. A manufacturing method of a film-coated member, the
method comprising: using the coating device according to
claim 7; discharging the coating fluid from the coating
fluid discharge ports while discharging the air from the
air discharge ports; and spraying the coating fluid onto
10 the to-be-coated member supported by the support unit to
manufacture a member on which a coating film is formed.
9. The manufacturing method of a film-coated member
according to claim 8, wherein an air flow rate discharged
15 from the air discharge ports is within a range of 900
NL/min to 1500 NL/min per width of 1 m.