| The SCHOLD Series VHLS Co-Axial Dispersers are designed for mixing and dispersing of products with a very wide range of viscosities, such as inks, caulks, paints, dyestuffs, texturizing compounds, putties, adhesives, etc. The Co-Axial Disperser can handle product viscosities in excess of 1,000,000 cps, yet can equally handle those jobs normally done by a high speed disperser. In many instances, the Co-Axial Disperser will replace much more expensive sigma-blade and/or cone/worm type mixers. The Co-Axial Disperser is virtually several machines built into one. |
The Co-Axial Disperser combines a slow-speed, high-torque blade, closely matched to the mixing vessel inner diameter, with a high-speed, high-shear blade in a “co-axial” position.
The low-speed blade is similar to the SCHOLD “Bow-Tie” blade which has gained wide acceptance on the SCHOLD low-speed dispersers. This blade mixes by forcing material to flow through and around itself and by causing shear of material on material and of material on vessel walls. Since it is constantly sweeping the periphery of the vessel, the operator is assured that there are no hidden lumps in the bottom corners of the container. Finally, and perhaps most important, it creates a vortex which is always feeding the high-speed blade and maintains a uniform batch temperature.
The high-speed blade is tucked neatly in the center of the low-speed “Bow-Tie” blade where it is in the most advantageous position to start work immediately in a cold batch. Material flowing to the high-speed blade is subjected to intense shear, but dissipation of heat by the vortex flow prevents danger of hot spots or burned color. |
The double action obtained from each blade supplementing the work of each other results in an overall batch time of from 1/3 to 1/2 the time required for other dispersion methods.
As in SCHOLD VHS and VLS dispersers, the Co-Axial VHLS can be raised and lowered by plant air over a hydraulic system, and can be locked in any raised, lowered or intermediate position.
A mechanical or hydraulic speed control system (standard on 75 HP and 100 HP models, optional on others) provides precise finger-tip control for both blades. An independent pneumatic system controls the engagement of the high-speed blade, thus allowing the Co-Axial Disperser to be used as a slow-speed, high-torque mixer for incorporating dry ingredients with minimum dusting. The disperser is ideal for preparing materials requiring shear for initial preparation, but which become shear-sensitive dunng the later stages of dispersion.
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Controls are conveniently located on the Co-Axial Disperser head. The hydraulic speed control system panel can be mounted remotely for operator convenience.
An ampmeter is provided for monitoring power consumption for optimum performance. Explosion-proof push-button stations and combination starters in NEMA 1 or explosion-proof enclosures can be supplied, either factory-mounted or shipped separately for field installation at your convenience.
An adjustable air-operated tub holder for maximum security in holding the mixing vessel under high-speed operation is standard. High tensile strength chain is used in conjunction with an air-locking cylinder to accommodate varying tub diameters.
SCHOLD can supply a wide choice of mixing vessels to meet your precise specifications, as well as tank covers that will raise and lower with the disperser. Multi-vessel capability is one more option you may wish to consider.
(Also available in stationary tank mounts)
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How it Operates:
The slow-speed blade of the Co-Axial Disperser is similar to the "Bow-Tie" blade used by SCHOLD VLS-Series Slow-Speed Dispersers. This blade mixes by forcing high viscosity material to flow through and around itself, and causing shear on material and on the vessle walls and blade. The slow-speed blade creats a vortex which causes product to flow to the high-shear blade, which is located immediately below the center of the slow-speed blade, where it receives maximum product from the throat of the vortex, and where it can entrain the minimum of air. |
