Comil Tooling Select.. - Sawyer/Hanson Innovations

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considered confidential and may not be reproduced
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Quadro Engineering.
S ALES T ECHNICAL B ULLETIN STB008
Quadro ® Comil ®
C OMIL ® T OOLING S ELECTION
Q UADRO ® C OMIL ® I MPELLERS
Quadro has designed and manufactured hundreds of different impeller styles in the past to meet various application challenges.
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.
Note: The impeller should always be rotating clockwise when viewing from the top of the machine.
B ASIC
I MPELLERS
1601 Round Bar Impeller Characteristics
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.
Typical Applications
• Dry Milling
• Some Wet Milling
1607 Square Bar Impeller Characteristics
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.
Typical Applications
• The Universal Impeller
• Wet Milling
• Dry Milling
• Use With Grater Screen For Product With Moisture
Page 1 of 4
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QUADRO ® COMIL ®
Basic Impellers Cont’d
1609 Beveled Impeller Characteristics
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.
Typical Applications
• For Finer Grind
1612 Impeller Characteristics
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.
Typical Applications
• For Higher Capacities
H OW D O A LL T HESE A FFECT T HE M ILLING P ROCESS
*
*Pr. = Pressure
Page 2 of 4
LOCAL REPRESENTATIVE
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

QUADRO ® COMIL ®
How Do All These Affect The Milling Process
Cont’d
Capacity: 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.
Fine Generation: 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 particles.
The other impellers create less fines, as per the above noted sequence.
Screen Pressure: Highest on the 1612 impeller and lowest on the 1609 impeller.
Amperage Draw: Highest on the 1612 and lowest on the 1609 impeller.
S CREEN
S ELECTION
Quadro has designed and manufactured hundreds of different types of screens but this Bulletin illustrates the few basic types.
“R” Round Holed Screens: 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.
“Q” Square Holed Screens: Used for wet (moist) product sizing and when larger particle sizes
are required. Applications include wet granulation sizing/dispersion in tablet manufacturing, sizing
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.
“S” Slotted Holed Screens: 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.
Page 3 of 4
LOCAL REPRESENTATIVE
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

QUADRO ® COMIL ® Page 4 of 4
S CREEN S ELECTION C ONT’ D
“G” Grater Holed Screens: 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, sizing
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.
A PPARENT H OLE S IZE
When selecting the proper screen hole size, the apparent
hole size must be considered. What is the apparent
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 velocity,
let's say "v", it will "see" the diameter of the hole as
D2.
“C” Condidur Holed Screens: 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 diameters.
Other specialty screens have not been covered here. Please consult Quadro for further details and also, the Application
Bulletins for more information.
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.
LOCAL REPRESENTATIVE
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