Bakers around the world are taking increasing advantage of the quality and cost benefits offered by the pressure/vacuum option available with all Baker Perkins ‘Tweedy’ high-energy mixers.

Controlling the speed of the main motor during ingredient dumping and dough discharge, in conjunction with fully automatic ingredient feeds, makes a truly automatic mixing system possible.

Pressure vacuum mixing is now widely used at industrial bakeries in the UK, Europe, Africa and Australasia. During the process, pressure and vacuum are applied sequentially to the mixing bowl.

Air is beaten into the dough by pressurising the bowl in the first part of the cycle, providing more oxygen to enhance the operation of Ascorbic Acid as the oxidising agent. In the second mixing phase, partial vacuum controls the formation of the bubbles in the dough to refine the crumb structure.

The pressure and vacuum stages of the cycle can be adjusted so that the full range of structures can be produced, from open-structured breads such as baguettes to pan breads with close and uniform structures.

Traditional process control characteristics – flour/water weight proportioning, accurate water blending and energy control – are all retained.

Cost saving and quality enhancing benefits include increased yield as dough is more machineable at a higher water content; improved crumb colour and softness – and hence improved shelf life; and a reduction in expensive Ascorbic Acid normally used to aid oxidation.

Inverter control for the main motor permits variation of mixing impact plate speed, creating a high degree of versatility during mixing. Five different settings in the recipe allow impact plate speed to be varied during the mix, fine-tuning the energy profile, and avoiding damage to inclusions such as soft fruit.

A further significant advantage is much improved dough discharge, with tilt possible to an angle of 50º below the horizontal - this increases efficiency and eliminates the need for a full time operator.



For more information
Go to www.bakerperkinsgroup.com/tweedymixers

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+44 1733 283000 fax +44 1733 283008
Email on bpltd@bakerperkinsgroup.com