DROPLETS AINT DROPLETSAgserv

Droplets aint droplets.• Understanding droplet size.• Different methods of application.

– Equipment– Nozzles

• Getting the best from you chemicals through correct application.

Understanding droplet size.Measure• Microns (μm) (micrometers). One micron equals 0.001 mm. • Droplet size is diameter of individual droplet• Droplet spectrum is the distribution of droplets from a devise or

nozzle to form classes

EquipmentTypes of application

Surface/Soil1. Fine surface spray2. Surface spray3. Flooding4. Foaming

Space1. Fog2. ULV3. Mist4. Aerosol

• Thermal fogging, smoke generation• Around 10 Micron Thermal foggers: uses high temperatures to produce large quantities of fog without degrading the active ingredient. Thermal foggers produce a very large quantity of very small droplets, very quickly.

1. Fog

2. ULVUltra low volume (ULV) fogging machines • Fogging machines that use large

volumes of air at low pressures to transform liquid into droplets that are dispersed into the atmosphere.

• This type of fogging machine can produce extremely small droplets with diameters ranging from 1-50 µm.

• True ULV less than 50 µm• ULV often confused with misting• Application: Mosquito control, Bird

Control, Midges & other flying insects.

Cyclone from Dyna Fog LR 18 Longray

3. Mist• Misting or cold fogging• Droplet size 20 -150 µm• Very common in PCO

Dynafog Hurricane Fogmaster TrijetLongray 2680

4. Aerosol

Aerosol• Invented 75 years ago by Eric Rotheim• Took off in WW2• 1st in Australia Mortein in 1950• 0.1 to 50 µm• CFC banned Jan 1996 (chlorofluorocarbon)

Aerosol Applicators• B&GBOC – Pestigas• High-pressure (5,000kPa) Aerosol spray (droplets range 2-20µ). Non-flammable, liquid CO2

4. Aerosol

Actisol® Compact UnitB&G - Portable Aerosol System

4. Aerosol

The influence of droplet size

Increased coverage = Increase efficacy

Turf Jet Turbo Teejet

XR Flat fan

Surface Spray1. Fine surface spray

– Back pack mister– Fine nozzle

2. Surface spray– Traditional pressure sprayer– Truck mount, hand hose

Back pack mister

• Fast to apply• Very even fine application• Drift issue

• 11.5 M throw• Huge range of droplet size• Droplet sheer

NB: Label states surface spray only

Patterns

SSSS1.SSS.

a.SSS

These classes (very fine, fine, medium, coarse, very coarse, and extremely coarse)

SSSS

SSSS1.SSS.

a.SSS

Minimising Drift

34% driftable droplets

12% driftable droplets

<1% driftable droplets

<1% driftable droplets

Nozzle Selection•There are many types of nozzles

– Flat Fan Standard– Flat Fan - Drift Reduction– Anvil– Hollow Cone– Full Cone– Double Outlet– Off Centre– Twin Fluid– Banding (or Evenspray)

5. Foaming• Mix water & air with a foaming agent (Detergent)

you get foam• More air dryer foam• Thorough surface application in the long run.

• Versafoamer HH can be used to apply foam

to wall voids…

4. Flooding & Injecting