New mixer design promises benefits

A new design of magnetic mixer which eliminates many of the negative aspects of traditional top and bottom mount mixing vessels is offered by Biopharma

The Asepco PolyMixerT claims to be a new generation of mixing system, providing a better mixing performance in CIP and SIP process systems, without the disadvantages of other methods.

First and second generation mixing vessels (top motor mount and bottom magnetic drive) have, by virtue of their design, a number of disadvantages, says Biopharma.

Typically, these are for top mount designs; the need for high head clearance, can be top heavy, inability to mix to the bottom of the vessel, double mechanical seals required means extra maintenance and difficult motor and drive access.

For bottom mount magnetic drive mixers the disadvantages can be large welding diameter on the mounting plate causing warping and impeller fit problems, decoupling problems due to wide design, limited mixing modes, and blade restricted to bottom location in tank.

Crucial to the improved performance of the Asepco PolyMixer is the design and assembly of its motor, weldment mounting post, and impeller hub.

The rigid small diameter weld post allows enables installation and unlike magnetic mixers with larger footprints, eliminates vessel warping.

A stronger magnetic coupling is possible with the PolyMixer drive because of its concentrated flux hoop design, resulting in between double and triple flux strength increases.

A wide choice of agitation blade designs, including marine, Rushton, and axial, ensures optimum process flexibility helping users to customise their mixing dynamics.

Extended multi-blade shafts are available for agitation of total tank volume, enabling mixing region specialisation.

Moving away from the potentially misleading measurement of motor speed, Asepco is able to offer true impeller RPM for its magnetic mixers.

The Asepco PolyMixer is available in 316L stainless steel, Hastelloy, C-22, C-276, and AL6XN.

Impeller speeds are 0 to 1800 rpm and motor types offered are AC, DC and air.

Bearing materials are available in tungsten carbide or silicon carbide and tank volumes range from 5 litres up to 20,000 litres and above.

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