Alpine CW Contraplex Pin Mill

size-reduction chemical food pharmaceutical mineral

The Alpine CW Contraplex Wide Chamber Impact Mill was originally designed for the processing of cocoa powder but has since found many uses beyond that industry. These wide chamber mills perform trouble free ultra fine grinding of difficult products, even in continuous operation.

Ideally suited for size reduction of crystalline or needle like particles and fatty or oily feed materials which are found in both the pharmaceutical and food industries. The units wide chamber housing prevents internal coating and blockage problems. The unit’s power requirements are lower compared to some other milling technologies, in some cases up to 50% lower depending on the product.

Ultra fine particles are achieved by the high relative speed of the discs. Adjustment parameters such as direction of rotation, disc speed, air flow and feed rate combinations permit milling conditions that can be customized to virtually any milling problem. Depending on the product, process rates can be as high as 5200 kg/hr.

Available Options

Cryogenic designs for use with applications that require cooling or embrittling grinding
PSR11 (Pressure Shock Resistant, 10 Bar(g) construction)
316 or 316 L stainless steel available
Nitrogen inert systems, explosion proof execution
Vertical or horizontal designs
Various discharge and filtering options

The Alpine CW Contraplex Wide Chamber Impact Milis a fine impact mill with two driven pin discs. In counter-rotating mode, much higher relative speeds are possible than with the UPZ fine impact mill with only one driven pin disc. The highest relative speed develops at the outermost pin rows and can be up to 250 m/s. The feed material should be brittle with a maximum Mohs hardness of 3.

The fineness can be adjusted by altering the pin disc speeds. The centrifugal forces acting on both discs ensure that even moist, greasy and sticky products can be processed. The design with the wide-chamber housing is ideal for processing these kinds of products. The feed material is often embrittled by intensive mixing with liquid nitrogen.

The mill door can be hinged opened wide to permit easy cleaning. Dependent on the machine size, product feed is either from the front via the machine door or from the rear of the mill housing.