A concentrated flavor or fragrance is only as good as the droplet, the particle, and the temperature you leave it in. Oleoresins, essential oils, resinoids, and powdered extracts have to wet out, break up, and stay suspended in water, alcohol, oil, propylene glycol, glycerin, or a syrup base. If the oil droplets are too coarse, the batch rings, creams, or separates on the shelf. If a powdered extract never fully wets, the formula tastes thin in one drum and harsh in the next. If the mix runs hot for too long, the top notes leave the tank before the product leaves the plant.
Kady International has listed this duty for years: disperse concentrated flavors and fragrances. The same high-speed rotor-stator head used for pigments, salad-oil emulsions, and mustard does the work. It pumps product through radial slots in a high-speed rotor and drives it into the staggered slots of a close-clearance stator, at tip speeds up to 9,000 feet per minute. Impact, attrition, and forced recirculation wet the concentrate, cut the droplet size, and distribute an expensive active through the whole batch.
Send a formula or a problem batch. Call 207.883.4141 or Request a Quote and we will match the head, vessel, and temperature control to the concentrate.
What Goes Wrong Before the Mill
Most flavor and fragrance failures are dispersion failures, not formula failures.
- Coarse oil droplets. A propeller or slow sweep can blend a tank and still leave droplets large enough to cream, ring, or break after a temperature swing.
- Unwetted powders. Vanilla, cocoa, spice oleoresins on a carrier, and encapsulated flavors clump if the liquid never reaches the particle surface.
- Local overdose. A concentrate poured into one corner of the tank never reaches the same strength in every package.
- Heat and air. Long mix times, open tanks, and uncontrolled shear raise temperature, strip volatiles, and oxidize citrus, mint, and floral notes.
- Too many vessels. A premix, a high-shear pass, and a letdown step each add transfer loss of an ingredient that is priced by the kilo, not the pound.
The mill has to wet, shear, and homogenize without cooking the batch. Jacketed vessels, cooled shafts, and variable-frequency drives keep energy input where the formula needs it and nowhere else.
How the KADY Head Disperses a Concentrate
The KADY dispersion head is a slotted rotor running inside a slotted stator. Upper and lower propellers feed the head so the batch does not sit in a dead zone while a small volume gets overworked.
- Wet-out. Liquid is forced across the particle or droplet surface instead of riding over a lump.
- Droplet reduction. Oil-soluble flavors and fragrance oils are cut into a finer, tighter size distribution so emulsifiers can coat them before they coalesce.
- Deagglomeration. Carrier-borne powders and resinous concentrates break at the rotor-stator face rather than smearing on the wall.
- One working zone. Many formulas finish in a single vessel. Continuous mills can be set for a defined pass when the line is built for throughput instead of batches.
That is the same mechanism behind KADY salad-oil emulsions and other oil-in-water work. Flavor and fragrance concentrates are simply a higher-value version of the problem: small mass, high cost, no tolerance for fish eyes or floating oil.
Prove it on your concentrate, not a stock demo. Kady offers free testing. Bring the oil, the powder, and the base. Call 207.883.4141 or start at free testing.
Where the Application Shows Up
The duty is broader than a single beverage tank.
- Beverage and syrup bases. Citrus oils, cloud emulsions, and powdered tea or coffee extracts dispersed into water, juice, or sweetener systems.
- Bakery, dairy, and confection flavors. Butter, vanilla, cocoa, and spice concentrates held in oil, glycerin, or propylene glycol.
- Savory and culinary extracts. Oleoresins of pepper, paprika, garlic, and herb that must disperse without specks or hot spots.
- Fragrance compounds. Essential oils and aroma chemicals emulsified into water for personal care, household, and air-care bases.
- Cosmetic and anhydrous systems. Fragrance oils and oil-soluble actives cut into creams, lotions, or silicone and ester bases without a separate homogenizer step.
Sanitary construction, stainless wetted parts, and special alloys are available when the product or the cleaning chemistry requires them. Vacuum or pressure covers can be added when the process needs deaeration or a closed headspace.
Heat, Air, and the Notes You Are Trying to Keep
High tip speed is useful only if the batch temperature stays inside the formula window. Top notes are lost to heat and headspace long before a viscosity reading looks wrong.
- Jacketed vessels for heating a viscous base, then cooling once the concentrate is in.
- Variable-frequency drives so the head runs only as fast as the droplet spec requires.
- Short cycles, because the energy is delivered in the head instead of by hours of bulk stirring.
- Closed or vacuum operation when oxidation, foam, or aroma loss is the real limit.
The goal is a uniform dispersion with as little residence time at elevated temperature as the formula will allow.
From the Lab Bench to the Production Floor
Flavor houses and fragrance compounders rarely want a new machine until the bench batch matches the plant batch. The Model L lab mill uses the same rotor-stator principle as the production line, with a working range suited to sample work and a path to continuous setup when the trial calls for it. Results on the L are meant to correlate to the larger KADY mills, so a droplet spec or a wet-out time found in the lab is not a different process at scale.
Production options follow the volume:
- Top entry mills for batch flavor bases and multi-product tanks.
- Bottom entry mills when discharge, viscosity, or vessel geometry calls for it.
- Continuous flow mills when the concentrate is metered into a running stream.
- High-speed production mills for full-scale dispersion, emulsifying, and homogenizing.
- Refurbished mills, rebuilt to factory specs and shipped with a new-machine warranty, when the duty is proven and the capital budget is not.
What to Have Ready Before You Call
A useful quote starts with the concentrate, not the horsepower.
- Oil, powder, resin, or encapsulated solid, and the carrier it arrives in.
- The let-down base: water, alcohol, oil, glycol, glycerin, syrup, or emulsion.
- Target solids or oil load, batch size, and batches per shift.
- Temperature limits and any note that fades with heat or air.
- Cleaning method and alloys you already know you need.
With that, Kady can size the head, the auxiliaries, and the thermal package instead of forcing the formula onto a stock mixer.
Put the Concentrate Through the Head
KADY International has designed and built high-speed rotor-stator mills in Scarborough, Maine since 1949. The mills mix, disperse, emulsify, homogenize, and deaerate fluid and solid systems, and they are running in more than forty countries.
Talk to sales and engineering about a flavor or fragrance dispersion. Call 207.883.4141, email
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