Size Reduction System
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Size Reduction Systems Controlled particle size reduction. Predictable results. Fitzpatrick Company

The Process ( kom ‘ noot’ ) tr. v. Controlled size reduction with predictable and repeatable results. e Comminution has evolved into more than hammermilling or grinding. The Fitzpatrick Company has perfected FitzMill® comminution equipment to precisely control the particle size reduction process. Equipment variables that affect process results include: Introduces material on a tangential path to the comminuting chamber. Blade Profile Helps determine degree of reduction based on material being processed Screen Type Helps regulate particle output within a specified size range Rotor Speed...

(see page 10) Controllable comminution requires that product be introduced into the processing chamber on a tangential path relative to the machine’s milling blades. FitzMill feed throats provide exacting control over feed angle, assuring consistent, predictable results. Fitzpatrick offers a wide range of standard and custom throats. If your process requires heat transfer or introduction of inert gas, a special throat can be provided. Rotor/Blade Assembly KNIFE EDGE KNIFE EDGE KNIFE EDGE KNIFE EDGE KNIFE KNIFE KNIFE EDGE EDGE EDGE PARTICLE AT PARTICLE AT LOW SPEED LOW SPEED PARTICLE AT...

QUALITY BEGINS WITH THE FITZMILL At the heart of every FitzMill is the comminuting chamber. Fabricated from stainless steel or special alloys, it houses the rotor, blades and screen. FitzMills are engineered to make the chamber accessible for easy cleaning, inspection REVERSIBLE ROTOR ENHANCES VERSATILITY AND BLADE LIFE You can quickly reverse the rotor on many FitzMills, thereby reversing the blade edges to accommodate a different process (i.e., switch from the knife to the impact edge). Where both edges are identical, reversibility can effectively double blade lifi EASY TO CLEAN AND...

Safety Features Protect Personnel The entire machine can be shielded for noise attenuation. Moving parts, such as flywheels and belts, are fully-enclosed in guards. A safety interlock prevents the machine from being activated when rotor and blades are exposed. Feed and discharge openings feature protective grid bars that discourage milling chamber access while the machine is operating. Where grid bars in the feed opening are not practical, a special reverse-S (RS) design feed throat can be provided. The reverse-S can prevent access to the rotor blades without obstruction to product entry....

FitzMill® Comminutors For Small, Medium Scale Production Typical Applications • Coarse grinding and chopping of dry material • Size reduction of wet material • De-lumping of agglomerated material, wet and dry • Pulverizing • Solid/liquid blending • Granulating compacted material • Processing slurries and liquids • Processing and conditioning wet and dry materials • Pureeing and emulsifying AIR PERMEABLE DUST RETAINER Using a dust retainer to connect the mill discharge to the product container will contain the material being processed and vent the process air created by the rotor. Dust...

The Fitzmills shown on these pages represent only a few models out of hundreds of configuration possibilities. This SPV-FAS020 incorporates a shroud for sound attenuation. The panels are constructed of stainless steel outer shells with lightweight, sound attenuating pads made of F.D.A.-approved materials. The shroud is made with removable panels for easy cleaning and maintenance. The feed system on a Variable Feed Screw (VFS) FitzMill Comminutor is constructed of all stainless steel with disassembly and cleaning in mind. The VFS System provides greater efficiency when grinding to finer...

FITZIVIILL® SCREENS Round Hole Perforated Square Hole Perforated A complete selection of screen types and sizes is available to produce the particle sizes you require. Screen openings generally vary from 0.30mm (.01 2") to 38mm (1.5") with round or square perforations, diagonal or straight slots, or with a rasping surface. Special fabrication techniques assure long service life. Screen construction is often customized to meet specific customer

FitzMill® Blades And Rotor Assemblies OVERVIEW Proper blade style selection is important to assure the desired particle size. When pureeing or pulverizing, impact edges are preferred. When sizing, chopping or granulating, knife edges are usually best. Reversible blades, featuring a knife and blunt edge, are available for application versatility. Fixed or removable tip blade assemblies are offered. Fixed blades feature one-piece construction and simply slide onto a spline to create a complete rotor assembly. Removable tip blades feature a shank that slides onto the rotor. A blade tip is then...

Feed Throats Selecting the proper feed throat for your FitzMill comminutor will partially determine the blade force and action imposed upon feed material, thereby affecting particle size. Inlet location on the feed throat affects particle size distribution. A horizontally situated inlet exposes product to more break-up surface area, producing a finer grind. The addition of breaker bars on inner surfaces of a feed throat produce yet finer grinds. A forward, vertical inlet minimizes break-up and immediately exposes more material to the screen yielding larger-sized particles. A wide range of...

Machine Specifications CHAMBER ROTOR MACHINE LIMITS APPROX. DIMENSIONS5 NOMINAL WIDTH SCREEN AREA Throughput relative to Model D-6 at same Tip Speed RPM2 ˜ RPM1 (Diameter 1/Diameter 2) = With type 125, 225 or 425 blades With V-belt drive at maximum R.P.M. With typical throat and 36” (91.4 cm) between chamber discharge and floor Consult with your Fitzpatrick Sales Engineer for proper throat selection

SINCE 1930 WITH OVER 30,000 MACHINES SOLD WORLDWIDE With the introduction of the FitzMill® Comminutor in the 1930’s, Fitzpatrick has pioneered particle size reduction technology for a wide variety of industries. With a focus on providing process flexibility and repeatability, cleanable and sanitary designs, and robust equipment that is easy to use, the FitzMill® Comminutor is a trusted part of many processing installations worldwide. The Chilsonator® Dry Granulation System was developed in the late 1950’s as Fitzpatrick developed expertise in particle forming technology. Fitzpatrick has...