How the High Speed Disperser Works?
High Speed Dispersers consist of a driven vertical shaft and a high shear disk type blade.
The blade rotates at up to 5000 fpm and creates a radial flow pattern within a stationary mix vessel. The blade creates a vortex that pulls in the contents of the vessel to the blade’s sharp edges. The blade surfaces then mechanically tear apart solids thereby reducing their size, and at the same time dispersing them among the liquid used as the carrier fluid.
High Speed Dispersers are ideal for dispersion that are up to a maximum of approx. 50,000 centipoise. When used in conjunction with Multi-Shaft Mixers, they can be useful to several hundred thousand centipoise.
Basic design parameters
The high speed disperser (HSD) is a basic mixing machine that used by many Chemical, ink, Plastic, paint, and adhesive manufacturers.
High Speed disperser equipped with a Cawl type saw-tooth disc-style blade, the HSD creates vigorous flow conditions ideal for mixing powders into a liquid batch. Mixing performance is optimized by following a few basic design guidelines including:
• Normal operating viscosity range: 1,000 – 25,000 cP and up to 50,000 cP max
• Motor specification: 1HP for every 50 liter of product
• Disperser blade diameter: approximately 1/3 of vessel diameter
• Disperser blade tip speed: ~5,000 ft/min
[Tip speed (ft/min) = blade diameter (ft) x 3.1415 x shaft speed (rpm)]
• Disperser blade location: min 0.5 blade diameter off the vessel bottom
• Full holding capacity of mix vessel: about 130% of batch size
Technique
∙The High Speed dissolver is a fast, high-capacity disperser with a wide range of speeds and high level of efficiency
∙Push-button speed control
∙Speed indicator and automatic speed reduction
∙The product is accelerated radially by the dispersion disk, deflected to the top and bottom at the tank wall and directed back to the dispersion disk through formation of a vortex
∙Shear forces around the circumference of the toothed disk result in highly efficient dispersion, good wetting and de agglomeration
∙For high-viscosity products, a tank wall scraping device can aid the mixing and dispersing process
∙Hydraulic lifting/lowering device
∙Push-button stroke adjustment
∙Adjustable tank clamping mechanism
∙Stainless steel shaft and dispersion disk; additional product-specific mixing tools available depending on the application
∙Manufactured in accordance with CE guidelines
Advantage
∙ Easy handling which reduces costs and time
∙ Customized solutions on request
∙ A wide range of variously equipped versions available for highest process safety
∙ Various, easily exchangeable mixing tools to increase the efficiency
∙ Temperature measurement by wand or agitator shaft which increases the reliability of the production process
∙ Optimal positioning of the mixing tool via hydraulic lifting/lowering device
∙ Dissolver only starts When the vessel is correctly positioned
∙ At the lowest possible speed
∙ Two-handed operation for lifting/lowering of the tank cover (optional design)
∙ Automatic switch-off, if the toothed disks are lifted above the level of the tank
∙ Protection against accidental contact with the rotating shaft
∙ Bellows serving as dust protection for the shaft