Quadro® Comil®

S A L E S T E C H N I C A L B U L L E T I N S T B 0 0 8

C O M I L ® T O O L I N G S E L E C T I O N

PPaaggee 11 ooff 44

TThhee iinnffoorrmmaattiioonn ccoonnttaaiinneedd wwiitthhiinn tthhiiss ddooccuummeenntt iiss

ccoonnssiiddeerreedd ccoonnffiiddeennttiiaall aanndd mmaayy nnoott bbee rreepprroodduucceedd

oorr ddiissttrriibbuutteedd wwiitthhoouutt tthhee eexxpprreesssseedd ccoonnsseenntt ooff

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B A S I C I M P E L L E R S

11660011 RRoouunndd BBaarr IImmppeelllleerr CChhaarraacctteerriissttiiccss

The "nip" angle for this impeller is relatively larger than the other impellers. The

particles are "nipped" between the impeller/screen, grabbed by the impeller and

pushed out through the screen.

TTyyppiiccaall AApppplliiccaattiioonnss

• Dry Milling

• Some Wet Milling

11660077 SSqquuaarree BBaarr IImmppeelllleerr CChhaarraacctteerriissttiiccss

The 1607 square bar impeller has a nip angle of almost zero. Here, the particles rely

more on the centrifugal force imparted by the impeller onto the particles to push it out

through the screen. Hence the particles would not be "grabbed" and pushed out as

quickly.

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• The Universal Impeller

• Wet Milling

• Dry Milling

• Use With Grater Screen For Product With Moisture

w w w . q u a d r o . c o m

Q U A D R O ® C O M I L ® I M P E L L E R S

Quadro has designed and manufactured hundreds of different impeller styles in the past to meet various application chal-

lenges. The round bar, the square bar, the beveled and the reverse square bars are the most basic forms. Each different type

of impeller arm interfaces differently with the screen wall.

NNoottee:: The impeller should always be rotating clockwise when viewing from the top of the machine.

Q U A D R O®

C O M I L®

L O C A L R E P R E S E N T A T I V E

Quadro Engineering

613 Colby Drive

Waterloo, ON, CA N2V 1A1

T 519-884-9660

F 519-884-0253

sales@quadro.com

www.quadro.com

Quadro, Inc.

55 Bleeker Street

Millburn, NJ, USA 07041-1414

T 973-376-1266

F 973-376-3363

quadrosales@aol.com

www.quadro.com

PPaaggee 22 ooff 44

11660099 BBeevveelleedd IImmppeelllleerr CChhaarraacctteerriissttiiccss

The 1609 beveled impeller is similar to the 1607 however, it has a beveled edge

where the particles can deflect back down into the screen. This "deflection" of

the particles basically keeps them in the screen a little longer than if the

1601 or 1607 impeller were used.

TTyyppiiccaall AApppplliiccaattiioonnss

• For Finer Grind

11661122 IImmppeelllleerr CChhaarraacctteerriissttiiccss

The 1612 impeller is opposite that of the 1607. It has the highest "nip" angle and

can "grab" particles and push them out through the screen, even more so than

the 1601 round bar impeller.

TTyyppiiccaall AApppplliiccaattiioonnss

• For Higher Capacities

H O W D O A L L T H E S E A F F E C T T H E M I L L I N G P R O C E S S ?

B a s i c I m p e l l e r s C o n t ’ d

**PPrr.. == PPrreessssuurree*

Q U A D R O®

C O M I L®

L O C A L R E P R E S E N T A T I V E

Quadro Engineering

613 Colby Drive

Waterloo, ON, CA N2V 1A1

T 519-884-9660

F 519-884-0253

sales@quadro.com

www.quadro.com

Quadro, Inc.

55 Bleeker Street

Millburn, NJ, USA 07041-1414

T 973-376-1266

F 973-376-3363

quadrosales@aol.com

www.quadro.com

PPaaggee 33 ooff 44

H o w D o A l l T h e s e A f f e c t T h e M i l l i n g P r o c e s s ?C o n t ’ d

CCaappaacciittyy:: The capacity would be highest for the 1612 because more particles can be "grabbed" and pushed out through the screen.

The 1601 would be ranked second, the 1607 third and the 1609 fourth.

FFiinnee GGeenneerraattiioonn:: The 1609 will cause the particles to be retained in the screen longer, hence a higher residence time. When that

happens, there will be more inter-particle attrition creating more fines. This impeller is selected when the user requires fine parti-

cles. The other impellers create less fines, as per the above noted sequence.

SSccrreeeenn PPrreessssuurree:: Highest on the 1612 impeller and lowest on the 1609 impeller.

AAmmppeerraaggee DDrraaww:: Highest on the 1612 and lowest on the 1609 impeller.

S C R E E N S E L E C T I O N

Quadro has designed and manufactured hundreds of different types of screens but this Bulletin illustrates the few basic types.

““RR”” RRoouunndd HHoolleedd SSccrreeeennss:: Used primarily for dry sizing or powder into liquid dispersion.

Applications incude dry granulation sizing in tablet manufacturing, bakery mix fat dispersion,

deagglomeration of soil, sizing and bulk density tuning of spray dried powders. Sizes range from

0.006” (0.15mm) - 0.250” (6.35mm) hole diameters.

““QQ”” SSqquuaarree HHoolleedd SSccrreeeennss:: Used for wet (moist) product sizing and when larger particle sizes

are required. Applications include wet granulation sizing/dispersion in tablet manufacturing, siz-

ing moist chicken or seafood coating for reclaim, de-wrapping candy, cheese chunks and sizing

centrifuge solids. Sizes range from 0.156”H X 0.156”L (3.96mmH X 3.96mmL) to 1.00”H X

1.00”L (25.4mmH X 25.4mmL) hole dimensions; where “H” and “L” are the Height and Length,

respectively.

““SS”” SSllootttteedd HHoolleedd SSccrreeeennss:: Used for breaking capsules before the “G” screen was introduced.

Applications include wet granulation sizing/dispersion in tablet manufacturing, separating dried

fruits such as raisins, cranberries, apricots, apples and pineapples (note, please consult Quadro

for a specially designed “S” screen for these applications), breaking glass bottles/syringes for

drug reclaim, sizing wet detergent lumps from cyclone wall build-up. Sizes range from 0.156”H X

0.380”L (3.96mmH X 9.65mmL) to 1.00”H X 2.18”L (25.4mmH X 55.37mmL) hole dimensions;

where “H” and “L” are Height and Length, respectively.

S C R E E N S E L E C T I O N C O N T ’ D

A P P A R E N T H O L E S I Z E

When selecting the proper screen hole size, the appar-

ent hole size must be considered. What is the appar-

ent hole size? It is the size of the screen hole that is

"perceived" by a particle traveling by the screen hole.

At zero velocity, when a particle "looks" at a hole, it

sees the actual diameter of the hole. In this slide it is

labeled as D1.

However, if the particle was traveling at a certain veloc-

ity, let's say "v", it will "see" the diameter of the hole as

D2.

D1 is always greater than D2. As the velocity goes up, the apparent hole size goes down.

For example, if you require a particle to be sized to 30 US Std mesh (or 0.0234"), then the screen selected should have a

hole diameter of approximately 18 or 20 US Std Mesh (0.0394" or 0.0331") or larger; of course, this depends on the impeller

rpm. Testing is generally recommended for proper tooling selection.

L O C A L R E P R E S E N T A T I V E

Quadro Engineering

613 Colby Drive

Waterloo, ON, CA N2V 1A1

T 519-884-9660

F 519-884-0253

sales@quadro.com

www.quadro.com

Quadro, Inc.

55 Bleeker Street

Millburn, NJ, USA 07041-1414

T 973-376-1266

F 973-376-3363

quadrosales@aol.com

www.quadro.com

Q U A D R O®

C O M I L®

PPaaggee 44 ooff 44

““GG”” GGrraatteerr HHoolleedd SSccrreeeennss:: They have a cutting edge on the holes. Used for sizing products

that are harder or more ductile (with some elasticity). Applications include sizing tablets in the

Pharmaceutical and Nutraceutical industries, powderizing cream-filled cookies for reclaim,

grating cheese, chopping nuts, sizing compacted “ribbons” from roller compactors in dry tablet

manufacturing, sizing pre-compressed slugs in tablet manufacturing, sizing cereal flakes, siz-

ing bread loaves for crumbs. This screen is often used when a tighter particle size distribution

curve is desired. Sizes range rom 0.040” (1.00mm) to 1.25” (31.75mm) hole diameters.

““CC”” CCoonnddiidduurr HHoolleedd SSccrreeeennss:: They also have a cutting edge on the holes. It is available in

smaller holed sizes when compared to the “G” screen. This allows for finer milling with less

chance of screen blinding. Sizes range from 0.006” (0.15mm) to 0.039” (0.99mm) hole diam-

eters.

Other specialty screens have not been covered here. Please consult Quadro for further details and also, the Application

Bulletins for more information.