Top Only Spray Coverage
A spinning disc with a focusing aperture lays down a simple spray pattern, perpendicular to the direction of product travel; that graduates in the strength of the spray linearly across its length. In certain applications, this can be very effective in providing a simple two-dimensional or “Top Only” spraying system. Note: The disc is inclined to improve the quality of the spray and to channel unused spray material back to the reservoir.
For a more effective application of spray liquid in a top only mode; two contra-rotating disc heads are used. The discs are grouped closely* together to provide a consistent, uniform spray directly over the product. A balanced stainless steel manifold ensures that the pump output is evenly distributed to each spray head. Spray material that is not deposited on the product is collected under the conveyor and channelled back to the reservoir. When used for spraying meat pies in foil bases, for example; this configuration protects the foil from being sprayed.
Precision Inverter/Motor Control Systems provides digital vernier control to the Spinning Disc Speed, Pump Speed and the Conveyor Speed. This provides a unique digital signature for each machine set-up. Product changeovers can be quickly accommodated by entering the signature code into the machine for the appropriate machine configuration. The precision accuracy inherent in the system ensures it correctly returns to an identical set up as the last batch for that particular product.
A proportion of the pump output is returned directly to the reservoir tank, which provides:-
- Improved precision in the control of the spray application rate.
- Continuous recirculation that inhibits separation of emulsions.
- Enhanced temperature stabilisation of the spray.
* In some applications the discs can be co-axial in this plane.