Top & Sides Spray Coverage
A spinning disc with a focussing 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. For “Top & Sides" coverage, a single disc is not sufficient. Note: The disc is inclined to improve the quality of the spray and to channel unused spray material back to the reservoir.
In Top & Sides spraying, it is important to ensure that the spray pattern covers evenly and with precision the key surfaces:
- Top Surface
- Front Leading Face
- Left Side Face
- Right Side Face
- Rear Trailing Face
To create a spray pattern for "Top & Sides"; we use a pair of contra-rotating discs. The spray patterns of each disc in this configuration merges with the other; to provide an even homogenous precision coverage of spray material across the full width of the system. The discs are arranged in a "V" shape; so that the front and rear of the product can be sprayed. 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.
The effectiveness of the "Top & Sides" coverage is also dependent upon the shape or profile of the product itself; as well as on the potential masking of the spray by adjacent products on the conveyor system. In such circumstances, we may use multiple spinning discs; ganged together as contra-rotating pairs. This provides the flexibility to create a configuration for consistent and uniform spray across the spray bed.
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 tank. Precision Inverter/Motor Control Systems provide 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 inhibits separation of emulsions.
- Enhances the temperature stabilisation of the spray.