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Exwold Complete Transfer of Mill to Haverton Hill

4th May 2016

Exwold have now completed the mill transfer to the Haverton Hill site. This was impressively completed in less than 8 weeks and is now ready to start its first manufacture in the new location.

Exwold have been operating at the Haverton Hill site since 1993 and have recently purchased the site. The Haverton Hill site will continue to be dedicated to Herbicide Water Dispersible Granule (WDGs) using mainly Radial Extrusion Technology.

To increase capacity and keep up with our customer demands, the site has been operational 7 days a week since the beginning of 2016.

Exwold are currently making a significant investment in the Toft's Farm site which will be completed in the summer of 2016.



Good blending is critical when producing WDGs and double u-trough ribbon blender Exwold has been used in the preparation of over 30 formulations. The versatility of this blender, allows us to charge bulk bags, small additions of co-formulants (as little as 1kg) and make liquid additions.


The Air Classifier Mill (ACM) is ideal for milling of herbicide formulations for WDG manufacture and can achieve partical sizes D90 <30 and D50<15.

Ewold have been milling since 2001 and are expert in the milling of Agrochemical formulations in preparation for granulation.

We understand that particle size is a critical parameter for all formulation work as it affects the surface chemistry and interactive forces. It is usual that the active ingredient - and possibly some of the adjuvants - will need to go through some form of partical size reduction process before it can be deemed ready to be granulated.

Under milling (too coarse) can lead to a number of physical issues like settling in a spray tank and spray nozzle blockages with poor distribution. It may also mean the active is not absorbed or taken up by the plant so does not work or could have residue affects and carry over into the next crop as not broken down quickly enough.

Over milling can cause phytotoxicity issues which may lead to crop damage.

Safety is paramount when milling products and the mill is also suitable for milling low MIE formulations after fitting additional safe guards. Exwold's experienced team ensure that all safety evaluations are completed as part of new product evaluation.

How does an ACM work?

The Air Classifier Mill (ACM) unit performs both impact grinding and classification of particles in one unit.

Feed material is drawn into the mill by the flow of air from the suction fan and the suction action created by the mill itself.

A high speed rotor forces the particles against a grinding track that reduces the size of the particles.

The airflow draws these particles upwards towards the variable speed classifier wheel and those particles small enough to pass the classifier are carried to the downstream filter collection system.

Particles too large to pass the classifier are returned to the grinding chamber for further processing. By controlling the speed of the classifier wheel it is possible to control the particle size distribution through the classifier.