HOSOKAWA ALPINE Aktiengesellschaft(细川阿尔派股份公司)商标

Contraplex Wide Chamber Mill - Contraplex CW

  • Pin mill with 2 driven pin discs for achieving high powder fineness values in the range of approx. 10 to 500 µm.
  • The wide chamber housing makes it possible to process even sticky materials.
  • Generously dimensioned mill door.
  • Principle of operation

    The Contraplex is 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.

  • Features

    The CW wide-chamber housing prevents coating formation and thus blockages in the machine. In comparison with the pin disc Ø, the machine housing is oversized. This is why Contraplex mills are ideal for fine grinding greasy, oily, sticky and hygroscopic materials which tend to form deposits - either in continuous mode or at relatively long cleaning intervals. Besides the wide-chamber housing, the rotation of both pin discs (both speed and rotational direction are adjustable) is a distinguishing feature. The following important application advantages result:

    • Wide selection of pins: Besides the standard head pin made of special steel, there is a wide selection of special pins available which make it possible to meet the highest demands regarding hygiene as well as freedom from wear and contamination.
    • Robust drive solution: The belt drive via standard motors permits optimum configuration of the transmission ratio for the process and the product. This means that the motor and pin disc work at the optimum operating point and the system achieves a much higher degree of energy efficiency than with direct drives.
    • Bearing unit: The optimum monitoring of bearing temperature and vibrations translates into excellent preventative maintenance.
    • Higher grinding fineness: Dependent on the type, the max. relative speed of both discs is up to approx. 250 m/s. Single-rotor pin, beater, cross-flow and turbo mills, etc. are unable to reach this high speed. The Contraplex therefore produces higher fineness values - especially with all brittle and crystalline materials. Individual adaptation of the grinding conditions to suit the feed material. The wealth of possibilities available in setting the rotational direction and disc speed combinations ensures that each and every product - especially heat-sensitive ones - is ground to an optimal fineness, is handled gently and that the pin discs remain free from deposits.
    • Intensive, agglomerate-free and homogeneous mixing-grinding of products: that consist of two or more components (food technology).
    • Trouble-free continuous operation: Products which cannot be ground in sieve mills due to their tendency to clog the sieve perforations - especially fine-mesh sieves - can be ground to high fineness values. Rinsing air protects the bearing unit from product ingress and prevents product from depositing behind the pin discs.
  • Applications
    • Minerals powders: calcium carbonate, fillers, calcium hydroxide. Coating of fillers with stearic acid, silane, etc. 
    • Pharma: vitamins, pharmaceutical auxiliaries.
    • Food: fatty proteins, spices (nutmeg, cloves, pepper, etc.). Disintegration of powders for protein shifting, corn starch, lactose, cacao, fish meal.
    • Chemicals: fine grinding of plastics (e.g. TPU, PA). Pesticides, hydrotalcite, pigments (e.g. ultramarine), carboxymethylcellulose (CMC).
    • Recycling: fine grinding of rubber.
  • Designs
    • Welded housing with either standard or tangential discharge.
    • Mild steel or stainless steel (e.g. 1.4541, 1.4571, 1.4404) for all machine sizes.
    • Pin discs and pins made of special steel.
    • Cast housing with standard discharge available for machine sizes 250 to 630.
    • Bearing unit protected against dust by air rinsing (automatic air intake or forced rinsing).
    • Bearing unit permanently lubricated or designed for relubrication.
    • Safety interlock.
    • Option: pharma design
    • Option: explosion-pressure-shock-proof design for a maximum explosion overpressure of 10 bar (g) with type test as defined in the ATEX Directive 94/9/EC.
    • Option: wear-proof pins.


Minerals & Metals Division
Tel. +49 821 5906-279
Fax: +49 821 5906-610
»  e-mail

Chemicals Division
Tel. +49 821 5906-402
Fax: +49 821 5906-438
­»  e-mail

Pharma & Lab Division
Tel. +49 821 5906-283
Fax: +49 821 5906-620
»  e-mail

Food Division
Tel. +49 821 5906-406
Fax: +49 821 5906-655
»  e-mail

Recycling & Granulators Division
Tel. +49 821 5906-415
Fax: +49 821 5906-630
»  e-mail

PDF Downloads

  • Pin Mills Types C and CW - Contraplex
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