Grinding and milling equipment

Size reduction is one of the oldest processes known to man – ever since grains have been ground to make flour. Size reduction machines still mill harvested materials but also a vast variety of other food, chemical, pharmaceutical and mined materials too. Each industry has its own requirements and every product presents its own challenges – for which SHAPA members have the solutions.

Grinding equipment

 

Coarse grinding mills

 

Fine grinding mills

 

Sub micron mills

 

Most size reduction is a mechanical process. For example, to grind minerals, the mined products are tumbled amidst heavy balls or long heavy rods which have a crushing action – hence the existence of Ball Mills and Rod Mills. Hammer Mills, literally metal hammers whirled round at high speed, are another method of pulverising minerals or metallic compounds.

The fine grinding of Food, Chemicals and some Pharmaceuticals usually takes place within Pin and Disc or Turbine Mills. These mills can reduce materials down to the fineness of flour or icing sugar and are the general workhorse of the Food, Chemicals and some Pharmaceuticals industries. Sieves, sifters and classifiers are often used in conjunction with these types of mill to screen out any oversize material so that it can be discarded or returned to the mill for further processing.

 For the finest grinding of materials to sub-micron sizes, Jet Milling is the more appropriate. In a Jet Mill, material is circulated around a circular or oval chamber at very high velocity under the influence of a compressed gas or steam. Size reduction is achieved purely through the attrition of one particle against another or the impact of particles against the wall of the milling chamber. The outlet of Jet Mills can be adjusted so that material can only exit once it has been reduced to the required size. Otherwise, it remains in the mill until it has! Some materials require special treatment: the volatile oils which give spices their desirable potency can be driven off through the temperature increase that occurs during any grinding process. To combat this, cooling of the mill is essential - frequently using a cooled airflow through the mill. Cooling down to cryogenic temperatures using liquid nitrogen makes the grinding of rubber, possible. The use of a nitrogen blanket can prevent the deterioration of aromatic products through oxidisation during milling. Size reduction is a key process in many production lines.

Ensuring you have the optimum mill for your materials is a job for the experts and you’ll find none better than those among the SHAPA membership.

Latest SHAPA News

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Find out about our new business helpline, financial planning and the MTC, along with all the usual networking oppertunities.
for more details and an agenda email Ian at info@shapa.co.uk

 

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LAST CHANCE TO ENTER 2017 Solids handling Industry Awards

Deadline 28/02/17 down load the application form today

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LAST CHANCE TO ENTER 2016 Solids handling Industry Awards

Deadline 28/02/16 down load the application form today

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Since the dawn of civilisation materials have been conveyed, by men and women toting sacks on yokes, by pack animals, carts and more recently using mechanical conveyances.

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It is well established that the SHAPA membership comprises many choice companies in bulk materials handling and processing, their combined experience amounting to centuries.

 

 

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