SIZE REDUCTION SYSTEMS

CONTROLLEDPARTICLE SIZEREDUCTION.PREDICTABLE

RESULTS.

THEFITZPATRICKCOMPANY

Comminution has evolved into more than hammer-milling or grinding. The Fitzpatrick Company hasperfected FitzMill® comminution equipment to preciselycontrol the particle size reduction process. Equipmentvariables that affect process results include:

THE FEED THROATIntroduces material on a tangentialpath to the comminuting chamber.

BLADE PROFILEHelps determine degree of reduction based on material being processed

SCREEN TYPEHelps regulate particle output within a specified size range

ROTOR SPEEDWorks with screen to regulate particle output within the size range

THE BENEFITS OF CONTROLLED PARTICLE REDUCTIONParticle size affects any number of characteristics inthe manufacturing process. Controlled particle sizehelps assure that your production will be consistentand repeatable with respect to:

• COLOR - uniform particles assure batch-to-batch colorconsistency

• TASTE - allows precise portion control for consistent taste

• FLOWABILITY - critical to packaging, tableting, weighing

• UNIFORMITY - consistent bulk density

• DENSITY - helps control shipping costs and minimize dust

• RECONSTITUTION - assures the desired dissolution rate

• CHEMICAL REACTION - vital for uniform, controlledchemical change

THE PROCESS

COM•MI•NUTE tr. v.Controlled size reduction with predictable andrepeatable results.

kom ‘ noot’e( )

2

THE FEED THROAT(SEE PAGE 10)Controllable comminution requires thatproduct be introduced into the processingchamber on a tangential path relative to themachine’s milling blades. FitzMill feedthroats provide exacting control over feedangle, assuring consistent, predictableresults. Fitzpatrick offers a wide range ofstandard and custom throats. If your processrequires heat transfer or introduction of inertgas, a special throat can be provided.

LARGE• • • • • • • • • • • • SMALL

MEDIUMROTOR SPEED

% O

F TH

ROU

GH

PUT

PARTICLE SIZELARGE• • • • • • • • • • • • SMALL

PARTICLE SIZE

HIGHROTOR SPEED

% O

F TH

ROU

GH

PUT

PARTICLE SIZELARGE• • • • • • • • • • • • SMALL

LOWROTOR SPEED

% O

F TH

ROU

GH

PUT

BLUNT EDGE KNIFE EDGE

PARTICLE AT LOW SPEEDPARTICLE AT HIGH SPEED

LIGHT GAUGE

HEAVY GAUGE

Forward, vertical inlet -best for fragile material

Fig. A Fig. B

Horizontal inlet - best for fine grinds

Throat with automatic feed assuresuniform feed rate

SCREEN TYPE AND ROTOR SPEED(SEE PAGE 8)For every combination of rotor speed andscreen, particles in a certain size range arepermitted to pass through the FitzMill’sscreen and exit the machine. Higher rotorspeeds flatten the approach angle of aparticle relative to a screen’s surface,effectively reducing the screen’s hole size(see Figure A). A circular hole, for example,appears elliptical, thereby allowing onlysmaller particles to pass through. At slowerspeeds, the approach angle increases,allowing larger particles to pass through. Asscreen gauge increases, opening size mustalso increase to maintain desired particlesize (see Figure B). Variable rotor speed andscreen interchangeability make it easy for asingle FitzMill to produce a variety of results.

ROTOR/BLADE ASSEMBLY(SEE PAGE 9)At the heart of the each FitzMill® comminutoris a rotor and blade assembly. Blades maybe fixed or swinging, and can be eitherknife-edged for gentle granulation or impact-edged for more aggressive reduction.Blades with one edge type on either side arealso available for versatility. A variety ofblade profiles assures the best match foryour product requirements.

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •

HOW ROTOR SPEED AFFECTS PARTICLE SIZE

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •

3

THE FITZMILL®

4

QUALITY BEGINS WITH THE FITZMILL CHAMBERAt the heart of every FitzMill is thecomminuting chamber. Fabricated fromstainless steel or special alloys, it housesthe rotor, blades and screen. FitzMills areengineered to make the chamber accessible for easy cleaning, inspection and maintenance.

REVERSIBLE ROTOR ENHANCESVERSATILITY AND BLADE LIFEYou can quickly reverse the rotor on manyFitzMills, thereby reversing the blade edges toaccommodate a different process (i.e., switch from the knife to the impact edge). Where both edges areidentical, reversibility can effectively double blade life.

EASY TO CLEAN AND MAINTAINSave time and expense. A FitzMilldisassembles quickly for fast, easy cleaning.Minimal routine maintenance is all that’sneeded for years of trouble-free service.

MOTORS AND CONTROLS FOR EVERYAPPLICATIONDrive motors are available for virtually everyworldwide electrical standard, for variable or singlespeed operation, and with special service andtemperature ratings including explosion-proof,washdown and TEFC. Convenient, customizedcontrols can be provided either machine-mounted,remotely-mounted, or in a mobile enclosure.

5

SAFETY FEATURES PROTECT PERSONNELThe entire machine can be shielded for noise attenuation.Moving parts, such as flywheels and belts, are fully-enclosed inguards. A safety interlock prevents the machine from beingactivated when rotor and blades are exposed. Feed and

discharge openings feature protective grid bars thatdiscourage milling chamber access while the

machine is operating. Where grid bars in thefeed opening are not practical, a special

reverse-S design feed throat can beprovided. The reverse-S canprevent access to the rotorblades without obstruction toproduct entry.

FITZMILL® COMMINUTORS

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

THERE’S A FITZMILL FORYOUR APPLICATION ANDALL THE HELP YOU’LL NEED TO SPECIFY ITAchieving your particle sizerequirements begins withapplication testing in one ofFitzpatrick’s laboratory facilities.Every effort will be made toduplicate your exact productionconditions to assure reliable testresults. Test data will be used byyour Fitzpatrick sales engineer todetermine the best FitzMillconfiguration for your processingneeds.

FOR SMALL, MEDIUM OR LARGESCALE PRODUCTION

S-DAS06 This manually-fed, belt-driven Model D features astandard throat, is available with reversible rotor, andcan be furnished with a selection of blades andscreens to meet any application need.

6

THE FITZMILLS SHOWN ON THESE PAGES REPRESENT ONLY AFEW MODELS OUT OF HUNDREDS OF CONFIGURATION POSSIBILITIES.

VFS-DAS06 VFS-FAS020The feed system on a Variable Feed Screw (VFS) FitzMill Comminutor isconstructed of all stainless steel with disassembly and cleaning in mind. TheVFS System provides greater efficiency when grinding to finer particle sizes.

This SPV-FAS020 incorporates ashroud for sound attenuation. Thepanels are constructed of stainlesssteel outer shells with lightweight,sound attenuating pads made ofF.D.A.-approved materials. Theshroud is made with removablepanels for easy cleaning andmaintenance.

SPV-FAS020 SPV-HAS030 SPV-DKAS012FitzMill Comminutors supplied with SPV, open type, feed throats are designed to accommodate special installation requirements.

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FITZMILL® SCREENS

A complete selection of screen types and sizes is available toproduce the particle sizes you require. Screen openings generallyvary from 0.30mm (.012”) to 38mm (1.5”) with round or squareperforations, diagonal or straight slots, or with a rasping surface.Special fabrication techniques assure long service life. Screenconstruction is often customized to meet specific customerrequirements. Your Fitzpatrick sales engineer can help you make theright selection.

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Rasping Screen Round Hole Perforated Square Hole Perforated

Striated

FITZMILL® BLADES ANDROTOR ASSEMBLIES

OVERVIEWProper blade style selection is important to assure the desiredparticle size. When pureeing or pulverizing, impact edges arepreferred. When sizing, chopping or granulating, knife edgesare usually best. When both processes are used, bladesfeaturing a knife and blunt edge are available.

Fixed or removable tip blade assemblies are offered. Fixedblades feature one-piece construction and simply slide onto aspline to create a complete rotor assembly. Removable tipblades feature a shank that slides onto the rotor. A blade tipis then bolted to the shank. Using either system, blades arepositioned on the spline to create the most efficient cutting orimpacting pattern.

BLADES FOR ABRASIVE PRODUCTSWear-resistant inserts and coatings can be applied to manyblade styles to extend their life in abrasive applications.Fitzpatrick’s removable tip blades enable replacement of worntips without disassembling the rotor.

BLADES FOR USDASpecial gasketing can beprovided between blades tomeet USDA 3A guidelines.

BAR ROTORA bar rotor can be suppliedwhen the most gentle formof reduction or de-lumpingis required.

Removable tip blades for abrasive products

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575

225

790 Double Coverage

625

625

790

225Knife/Impact

125Impact/Impact

575

425Knife/Knife

425shKnife3-Sides

700sh

Carbide Inserts

Selecting the proper feed throat for your FitzMillcomminutor will partially determine the blade force andaction imposed upon feed material, thereby affectingparticle size.

Inlet location on the feed throat affects particle sizedistribution. A horizontally situated inlet exposes productto more break-up surface area, producing a finer grind.The addition of breaker bars on inner surfaces of a feedthroat produce yet finer grinds. A forward, vertical inletminimizes break-up and immediately exposes morematerial to the screen yieldinglarger-sized particles.

A wide range of interchangeablefeed throats is available to optimizeyour FitzMill’s versatility.

FEED THROATS

VARIABLE FEED SCREW (VFS) SYSTEMOverfeeding can cause unpredictable results; starvingcan produce a wider-than-desired range of particlesizes. The FitzMill can be built with a variable feedscrew (VFS) option to assure precisely controlled feedrate. A VFS helps minimize waste, eliminatesoperator variables, and achieves particle uniformity.It is also preferred when finer grinding is required.

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Liquid Inlet Breaker Plate In Feed Throat

CHAMBER ROTOR MACHINE LIMITS APPROX. DIMENSIONS5

MACHINESPECIFICATIONS

MODEL

L1A

Homoloid

M5A

D6A

DAS06

DKAS012

FAS08

FAS012

FAS020

FHAS020

HAS030

1. Throughput relative to Model D-6 at same Tip Speed2. Tip Speed = factor x operating speed3. With type 125, 225 or 425 blades4. With V-belt drive at maximum R.P.M.5. With typical throat and 36” (91.4 cm) between chamber discharge and floor6. Consult with your Fitzpatrick Sales Engineer for proper throat selection

CAPACITYFACTOR1

.07

0.4

0.7

1.0

1.0

2.36

1.83

2.83

4.85

4.85

9.05

NUMBEROF

BLADES

8

12

16

16

16

32

16

24

48

48

80

TIP SPEEDFACTOR2

1.42

1.73

2.09

2.75

2.75

2.75

3.70

3.70

3.70

3.70

4.45

MAXIMUMRPM3

9,000

7,200

6,100

7,200

7,200(DK)9,000

6,000

6,800

6,000

3,000

3,600

2,400

MAXIMUMHORSE

POWER4

.5

10.0

3.0

5.0

15

30

40

75

75

75

150

▼

▼

▼

▼

▼

▼

LENGTH

HEIGHT

6

36"(91.4 cm)

▼

▼

WIDTH

6

SCREENAREA

8.5 in2

55 cm2

4327776

4901097031097032571658199

12843091994529341252934129866361

NOMINALWIDTH

1 in2.54 cm.

2.56.34.5

11.46

15.246

15.2412

30.488

20.3212

30.4820

50.8020

50.8030

76.20

DIAMETER

5.4 in13.7 cm6.62516.88.0

20.3210.526.6710.526.6710.526.6714.37536.5114.37536.5114.37536.5114.37536.5117.2543.82

LENGTH

18.546 cm

38.9632.8135.8942

1.0748

1.2260

1.5260

1.5260

1.5260

1.5268

1.73

WIDTH

15.4 in.40 cm

30.7626.6631.7830.7632.8136.9136.9144

1.1244

1.1260

1.52

HEIGHT6

20 in50 mm

521.32

551.3963

1.6066

1.6866

1.6872

1.8372

1.8372

1.8372

1.8375

1.90

11

THEFITZPATRICKCOMPANY

THE INNOVATION LEADER IN PARTICLE

FORMING TECHNOLOGY

We have been solving particle size reductionproblems for over 65 years. We’re confidentwe can solve yours.

• Our worldwide organization is strengthenedby experienced people and full-servicecapabilities.

• We can test your products in ourlaboratories to establish the best equipmentconfiguration to achieve desiredspecifications.

• If special processing considerations areencountered, our engineers can customdesign a FitzMill to meet your needs.

• As a FitzMill owner, you’ll be backed by ateam of technicians and service expertswhose mission is to keep your equipmenton-line and productive.

OTHER FITZPATRICK PRODUCTS:The FitzAire® fluid bed dryer

The Malaxator® continuousblender-heat processor

Guiloriver® and Guilocutter®

pre-breaking equipment

The Chilsonator® roll compactorsize enlarger

SR-9/03Visit us on our web sites : www.fitzmill.com

For Europe: www.fitzpatrick.be

CORPORATE HEADQUARTERS832 Industrial DriveElmhurst, IL 60126 USA Phone: 630-530-3333Fax: 630-530-0832E-mail: info@fitzmill.com

EASTERN U.S.DIVISION4219 S. Clinton Ave.South Plainfield, NJ 07080 USA Phone: 908-561-1500Fax: 908-561-9636E-mail: E-mail: info_nj@fitzmill.com

FITZPATRICK EUROPE N.V.Entrepotstraat 8B-9100 Sint-Niklaas, Belgium Phone: +32 (0)3 7806200Fax: +32 (0)3 7661084E-mail: info@fitzpatrick.be

THE FITZPATRICK COMPANY