High Shear Emulsifier & Homogenizer

High-shear emulsification: four parameters that decide the configuration

A high-shear emulsifier reduces droplet size by drawing material into a rotor-stator assembly and subjecting it to intense shear in a narrow gap. Four parameters decide which configuration your process needs — the machine is only the delivery mechanism for those parameters.

1. Rotor-stator geometry. Head design sets the shear profile: slot geometry, gap width and the number of stages. Geometry is chosen against the formulation's droplet-size target, not against a generic shear rating.
2. Tip speed. Calculated as π × rotor diameter × rpm ÷ 60, typically 10–30 m/s for rotor-stator work. Higher tip speed gives smaller droplets but also more energy input and heat, so the speed is set by the formulation, not maximised.
3. Droplet-size target. Typical achievable droplet size is 1–20 µm depending on formulation and number of passes. Cosmetic and pharmaceutical emulsions sit at the fine end and usually need vacuum capability in the vessel to remove entrained air.
4. Process integration. Batch in an existing kettle, one hydraulic head serving several vessels, or continuous inline as product flows through the pipe — each suits a different production pattern, and the wrong choice shows up as cycle time, not quality.

What this range covers

Three platforms cover the three principal configurations, from 50 L development vessels to 5,000 L production batches.

• Hydraulic Lifting Shearing Emulsifier (PYR series) — hydraulic-lift head serving vessels at 50–5,000 L. One emulsifying head covers several kettles, lifting clear for cleaning and changeover — the standard choice for multi-product plants.
• Pipeline High Shearing Emulsifier Pump (PWR series) — inline rotor-stator pump processing continuously as product flows through the pipe at 50–5,000 L equivalent duty. For continuous lines and recirculation duties where a vessel-mounted head would be a bottleneck. Inline units of this type are also known in some markets as colloid mills or inline homogenisers — the working principle is the same rotor-stator assembly.
• High Shearing Emulsifier for Kettle (PFR series) — kettle-mounted emulsifying head that converts an existing vessel into an emulsifying system at 50–5,000 L, for plants that already own the tanks.

Typical process routes

1. Cosmetics and personal care. Vacuum vessel, hydraulic-lift head, staged addition of phases with controlled temperature — vacuum capability is usually required for cosmetic and pharmaceutical emulsions to remove entrained air and protect the formulation.
2. Adhesives and sealants. Kettle-mounted or pipeline units on high-viscosity bases, often paired with a planetary or high-viscosity mixer for the bulk phase and the emulsifier head for the finish.
3. Chemical and agrochemical emulsions. Continuous inline duty where a pumpable emulsion is produced on the move, with the head sized to line flow rather than batch volume.
4. Multi-product plants. One hydraulic-lift head serving several kettles, lifting clear between products — the configuration that keeps changeover time down when formulas change often.

Comparing the three configurations

Configuration	Mode	Best fit
Hydraulic-lift (PYR)	Batch, one head serving several vessels	Multi-product plants with frequent formula changes and vessel cleaning
Pipeline inline (PWR)	Continuous, product flows through the head	Continuous lines and recirculation duties; also referred to as inline homogenisers or colloid mills
Kettle-mounted (PFR)	Batch in an existing vessel	Plants that already own suitable kettles and want to convert them

Tip-speed and droplet-size figures are indicative industry ranges for rotor-stator equipment, not guarantees. Achievable droplet size depends on formulation, viscosity, temperature, number of passes and head geometry — which is why we recommend a trial on your own formulation before a head and speed are fixed.

Frequently asked questions

What is the difference between the three emulsifier configurations?

Vessel-mounted heads convert an existing kettle into an emulsifying system. Hydraulic-lift units serve several vessels with one head, lifting clear for cleaning. Inline emulsifier pumps process continuously as product flows through the pipe. Each suits a different production pattern: kettle-mounted for existing tanks, hydraulic-lift for multi-product plants, inline for continuous lines.

What tip speed and droplet size should I expect?

Tip speed is calculated as π × rotor diameter × rpm ÷ 60, typically 10–30 m/s for rotor-stator work. Typical achievable droplet size is 1–20 µm depending on formulation and passes. Higher tip speed gives smaller droplets but more energy input and heat, so the setting is chosen against the formulation rather than maximised.

Is vacuum capability necessary?

For cosmetic and pharmaceutical emulsions, usually yes — entrained air shows up as instability, texture defects and filling problems. For many chemical and adhesive duties a closed non-vacuum vessel is sufficient. The requirement follows the formulation, so tell us the product and we will specify accordingly.

Can these emulsifiers handle high-viscosity feeds?

Rotor-stator heads work on pumpable material. Very high-viscosity bases are usually pre-mixed with a planetary or high-viscosity mixer and finished with the emulsifier head, or handled in a kettle-mounted configuration designed for the duty. Send the viscosity range and we will confirm the configuration.

Batch or continuous — which suits my throughput?

Batch configurations (hydraulic-lift, kettle-mounted) suit formula-driven production with changeovers. Inline continuous units suit steady formulations where product flows through the head on the move. Many plants run both: batch for specialty formulas, inline for the volume lines.

Are these units suitable for solvent-based and explosion-risk environments?

Solvent-based systems require explosion-proof specification — motor rating, sealing, ignition control and vessel design all follow the solvent and destination-market classification. Our explosion-proof equipment guide covers the approach for solvent-based coatings, and we will specify to your classification.

How is an emulsifier head cleaned between products?

The hydraulic-lift configuration exists largely for this: the head lifts clear of the vessel for cleaning and changeover without draining the tank. Kettle-mounted and inline units are cleaned in place or dismantled per the head design. Cleaning access should be specified with the machine for multi-product plants.

Can I develop the formulation at laboratory scale first?

Yes. Our laboratory high-shearing emulsifier covers development volumes, and the same rotor-stator principles apply at production scale. Send the formulation type, target droplet size and throughput through the inquiry form and we will specify head geometry, speed and configuration.

Related technical guides

• High Shear Emulsifier Selection Guide — rotor-stator design, tip speed calculation and application matching in detail.
• Complete Guide to Industrial Dispersers for High-Viscosity Materials — where dispersion ends and emulsification begins.
• Explosion-Proof Equipment for Solvent-Based Coatings — classification and specification for solvent systems.
• Émulsification industrielle (FR) — machines et procédés pour cosmétiques et formulations fines.
• High Viscosity Mixer Specs and Selection Guide — pairing the bulk mixer with the emulsifier head.