Single Shaft High Speed Disperser — Paint Disperser & High Shear Disperser

The POLYC PDM single shaft high-speed disperser, also called a dissolver, is a general-purpose wet dispersing and mixing machine for paint, coating, ink and pigment. A sawtooth disc on the dispersing shaft rotates at high speed to create strong shear, impact and turbulence that breaks agglomerates and wets out powder into the liquid phase, making it the standard workhorse for pre-mixing and let-down before milling or filling.

Sizes cover a working capacity from 20 to 5,000 L with motor power from 2.2 to 90 kW, from laboratory scale up to full production lines. POLYC supplies the disperser with hydraulic or pneumatic lifting for fast vessel change, and the head is matched to the vessel size and batch volume you run.

A laser-cut stainless steel sawtooth disc is mounted on the disperser shaft and turned by a VFD-controlled inverter-duty TEFC motor. The VFD gives stepless speed control from 0 up to 1,450 rpm (about 1,200 rpm on the larger units), so shear and tip speed can be matched to the material viscosity instead of running at a fixed speed.

The single shaft disperser is built for viscosity up to approximately 30,000 cP, which covers the vast majority of paint, coating, ink, pigment and construction-chemical premixes. For higher-viscosity duties a dual-shaft or planetary mixer is the better choice; the disperser is the economical path to a well-dispersed premix.

The sawtooth disc reaches a tip speed of up to 24 m/s, generating the shear and turbulence needed to wet out powder and break agglomerates efficiently. Tip speed is a function of disc diameter and rpm, and the VFD lets the operator tune it per batch.

The disperser head is raised and lowered on a heavy-duty hydraulic or pneumatic lifting column, moving clear of the vessel for fast colour change, cleaning and maintenance. Matching single- or double-layer vessels are supplied as required, and vessels can be jacketed for heating or cooling.

Yes. For solvent-based and hazardous-area duties, explosion-proof motors, control panels and interlocks are available; water-based materials can use standard non-explosion-proof motors. Units can be supplied for 380 V, 415 V or 460 V three-phase supply to match your plant.

A high-speed disperser wets and deagglomerates powder into a smooth premix but cannot reach fine particle sizes below roughly 20 micron; a bead mill is then used for final fine grinding. Most coating, ink and pigment lines use both: the disperser for pre-dispersion and let-down, and a bead mill for the final particle size.

A paint disperser wets pigment and filler powder into the liquid phase before milling. The sawtooth disc creates shear, impact and turbulence that break agglomerates, so the following bead mill receives a stable, well-wetted premix and reaches target fineness in fewer passes.

The terms overlap. A high speed disperser describes the machine class and its tip speed; a high shear disperser describes the duty it performs in the mixing zone. For coatings, inks and pigments these are normally the same single-shaft machine, running 18-24 m/s at the disc tip.

Check whether the shaft, disc geometry, VFD sizing and lift are built in-house, and whether tip-speed calculations and material trials are offered before purchase. POLYC MACHINE has manufactured high speed dispersers since 2006 across 50 to 5,000 L working capacity.