Variable Coating Nozzle™ (VCN)
Delavan’s Variable Coating Nozzle™ offers total control for demanding applications where control over a viscous media is required, including those in the pharmaceutical, food, and engineering industries. The VCN’s design allows the width of the spray, the atomizing air, and the flow of the liquid all to be controlled independently and remotely. The specially designed Air Cap reduces the build up of product, enabling longer production runs with reduced maintenance.
Total Droplet Control
- Consistency – Each VCN™ produces the same droplet spectrum throughout the run, every run.
- Accuracy – Our technical expertise guarantees a closely controlled droplet spectrum.
- Adaptability – The VCN™ Unit is available in sizes ranging from 0.8 to 2.5mm and will cope with a wide variety of coating media.
The graph shows the control and accuracy of the VCN’s droplet spectrum. This graph was generated at a Malvern Instruments lnsitec laser diffraction droplet analyser. The Delavan VCN™ was spraying a typical tablet coating medium with a viscosity of approximately 200 cP.
Available Products
VCN™ Variable Coating Nozzle produces an air-atomized flat fan spray pattern with a variable spray angle, providing precise and independent control of spray width, atomizing air, and liquid flow for demanding coating applications.
Flat Spray
LVCN™ Lab Variable Coating Nozzle delivers an air-atomized flat fan spray with a variable spray angle and independent spray control for laboratory and small-scale tablet coating applications using two to five coating guns.
Flat Spray
NVCN™ Nano Variable Coating Nozzle delivers an air-atomized flat fan spray with a variable spray angle and independent spray control for small-scale tablet coating applications using one to three coating guns.
Flat Spray
Features
Quality Assurance & Certification
Inspection
- All parts are manufactured on our world class CNC machinery and inspected at every stage of manufacture in our ISO9001 manufacturing facility.
- Every complete unit is tested and individually serial numbered prior to dispatch.
Characterization Certificate
- Full Material Traceability is ensured throughout manufacturing process.
- Droplet size characterization data can be provided on a Spray performance and velocity.
Variable Spray Width
- Optimizes the wetted area.
- Minimizes the risk of localized over-wetting.
- Maintains the optimum internozzle distance for all common coating media.
- Remotely controllable and is easy to adjust either manually, via a pressure regulator, or automatically from a control panel.
- Setting is uniform between nozzles and consistent each time the nozzle is operated – ideal for repeatable, automatic control in a
multi-nozzle configuration. - Low air consumption minimizes running costs.
Liquid Shut Off
- The flow of the liquid can be shut off automatically to avoid dripping.
- A special shut off sealing kit is available for use with low viscosity liquids.
Cleaning & Service
- Special Anti Bearding Air Cap design reduces build up of coating material during the run.
- Compact aerodynamic design reduces disturbance of the rotating air in the drum, giving more coating media on the product, resulting in less cleaning and wastage.
- Rapid strip-down and reassembly saves time between batches.
- Push-in connectors eliminate the need for special tools.
- Clearly marked ports speed up reconnection and reduce operator error.
- All parts can be ultrasonically cleaned.
- New design avoids entrapment of dirt and organisms.
- All wetted metal parts are 316 Stainless Steel.
- Seals can be provided in a number of FDA approved materials to suit various coating media.
- No additional parts required for inter-connection – comes complete with push-in connectors.
Potential Process Time Saving Using High Solids Coating System
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VCN™ Manifolds, Air Atomising Lances and Bespoke Nozzles
Modular Manifold Systems
Modular systems are the latest, most forward-thinking method for tablet processes, which involve completely new design challenges.
- All pipework is incorporated within the manifold to reduce air turbulence.
- Gun spacing is set by interchangeable spacers.
- Fully sealed units reduce cleaning downtime.
- Recirculating systems can be incorporated within the design.
- Interchanging gun parts reduce chance of leaking.
- Wide range of fitting options.
To complement our existing range of VCNs, we have produced a manifold with the following benefits.
Benefits
- Compact manifold and nozzle designs eliminate external feed pipes, reducing complexity over traditional spray manifolds.
- Designs available to suit single or multiple nozzle set ups.
- Uses lightweight materials to reduce the overall weight of the nozzle assembly for ease of maintenance and installation.
- Various inlet connections and designs available to suit specific requirements.
- Manufactured to the same high quality as our standard Variable Coating Nozzles.
- Metering set combinations available for the full range of Variable Coating Nozzles (0.8mm – 2.3mm).
Multi-Head Fluid Bed Nozzle
Using our knowledge of air assisted atomization, we have developed several multi head nozzles for use in fluid bed coating. We can currently supply 3 and 6 nozzle variations depending on the application required.
Latest News
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Request a Consultation
Have questions about our spray-nozzles or fluid handling systems? Looking for help on a unique application? Need help with a budget estimate to determine overall equipment costs? Please don’t hesitate to reach out — we’d love to help.