| 摘要 |
A spray nozzle for spraying a coating liquid on to food products includes a reservoir chamber 2 having a substantially cylindrical wall 4 and a discharge port 8 that is formed in a base of the reservoir chamber and through which the coating liquid is discharged in the form of a stream of droplets. A gas inlet 10 is adapted to supply pressurised gas (e.g. compressed air) to the reservoir chamber 2 in a substantially tangential direction such that the gas flows in a substantially circular direction within the reservoir chamber. A liquid inlet 12 is similarly adapted to supply the coating liquid at pressure to the reservoir chamber 2 in a substantially tangential direction such that the coating liquid flows in the same substantially circular direction within the reservoir chamber. A liquid vortex is created within the reservoir chamber to shear the coating liquid into droplets at the discharge port 8. A plunger means can be moved relative to the discharge port 8 in a direction substantially parallel with the longitudinal axis of the reservoir chamber 2 and is used to control the spray cone angle. |
