Hanningfield are able to offer a wide range of spare for cone mills, including a variety of screens and impellers, in different sizes, hole sizes, materials, finishes etc. Below is a description of some of the more common milling spares.

We are able to supply a wide range of spares to fit any type of cone mill.

Round Hole Screens

Round hole screens are used in most cone-milling applications. Typically used for the size reduction of free-flowing materials such as granules, small lumps and powders can be easily milled through the round hole screen. A wide range of screen meshes are available, in different size and with different apertures.

Grater Hole Screens

The surface of the grater screen will create a shearing action for breaking up the material. Typical applications for a grater screen include seeds, and hard products which are trying to be reclaimed, such as tablets or sweets. Failure to correctly identify the need for a grater screen can result in the generation of more fines or can severely damage the screen.

Square Hole Screens

Large aperture ‘square’ hole screens are mainly used for coarse milling applications such as deagglomeration of fruits or for producing flakes of material. The square hole screen is also suitable for wet-milling (moist) applications such as de-lumping of wet mass granulation in pharmaceutical processing.

Round Bar Impeller

A round-bar impeller is a general purpose impeller normally used with standard round hole or square hole screens. The edge profile of the round bar impeller gives a gentle crushing or pushing action against the material during milling.

Square Bar Impeller

The square bar impeller design is used in most cases where a grater screen is required. The sharp edge of the impeller profile provides a sharp ‘cutting’ action helping to break up hard particles. In some cases, both the square bar impeller and grater screen can be surface hardened to give an extended life.

For more information on our screens and impellers, please contact us.