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Hammer Mills for Pallet Grinding
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Table of contents
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Introduction…………………………………………….…………..3 Possible end products..............................................4 Considerations………………………………………..…………...5 Two-phase system……………………………………………6-11 Appendix..............................................................12 How does a pneumatic discharge hammer mill Work?...........................................................13 Pallet grinding system .........…………….…….……14 Brochures..……………………………………….……15-24 Contact us………………………………………………………...25
We all have them. Whether you buy, sell, ship or
warehouse, just about any business that handles
merchandise in large quantities has pallets. They are
the ideal tool for storing and moving myriad materials.
But what happens when the pallets become broken, or
are just no longer needed? All too often they become
a costly waste handling problem. However, if we
explore the possibility of recycling, this waste
handling problem becomes a saleable product.
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Pallets, pallets everywhere…
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Possible end-products:
Pallets & Pallet Scrap Miscellaneous Wood Scrap
Animal Bedding
Biodiesel
Boiler Fuel
Briquettes & Pellets
Cellulosic Ethanol
Landscape Mulch
Playground Cover
When comparing different methods of size reduction,
certain facts about your process must be known:
• Required throughput
• Required finished particle size
• Size and uniformity of in-feed material
• Method of feeding and collecting
• Existing infrastructure
Considerations:
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To achieve the majority of pallet grinding goals, a two-phase process is necessary to make the most valuable output product.
Given their dimensions and overall bulk, the ideal method
for reducing both whole pallets and pallet scrap is the slow
speed ram-fed grinder:
• The open "deck" design of the ram fed grinder allows for
easy in-feed of whole or partial pallets whether by hand, or
stacked on a fork truck.
• The hydraulic ram forces the pallets into the grinding rotor
which features four-way reversible tool-steel cutting
teeth which are hard enough to cut through nails or other
ferrous metals.
• The pallet material is continuously ground until it is able to
pass the screen covering the grinder's discharge area.
6
Phase One: Breaking them down
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Screen size can vary, and screens may be changed to
correspond with production goals. However, it is not
recommended that a screen smaller than 1" be used
for pallet processing. The smaller the screen, the longer
the mill will need to work to produce the required size.
Therefore, when processing a bulky product such as pallets or
pallet scrap, use of a screen smaller than 1" will dramatically
reduce the throughput of the ram fed grinder.
Phase One: Breaking them down
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slow speed ram-fed grinder
For this phase, a finish grinding hammer mill is the
best solution. Each of the items shown on the list of suggested
end products require a specific finished particle size. The role
of a finish grinding hammer mill is to produce the
required finished size, anywhere from mulch to
sawdust:
• The pre-ground pallets are fed into the grinding chamber
of the finish grinding hammer mill where a combination of
hammer blows, particle on particle contact, and impact
with the internal breaker plate work in unison to further
reduce the material.
• The material remains in the grinding chamber until it is
able to pass through the screen covering the mill
discharge.
• Screens are available in a variety of sizes, and can be
interchanged to correspond with the operator's production
goals.
Phase Two: The finish grind
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If the finish grinding hammer mill is outfitted with
an integral fan, the process is taken to the next level. The
pneumatic suction pulls the material through the hammer mill,
then conveys the finished material to storage.
Phase Two: The finish grind
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finish grinding hammer mill
When you add the finish grinding hammer mill to the ram
fed grinder not only do you go from whole pallets to the exact
desired finished particle size, but the throughput rate is
increased as much as 400% over that of the ram fed
grinder alone.
Exponential throughput!
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The fan from the finish grinding hammer mill pulls the
material through the ram-fed grinder, across the hump tunnel
magnets, and finally through the hammer mill.
In addition, since the hammer mill is producing the finished
particle size, the ram fed grinder doesn't need to be
concerned with it. As a result, a larger screen (2" to 3") can
be used on the ram fed grinder, thus providing less resistance
and allowing material to flow through the system at a much
higher rate while still liberating all metals from the wood.
Here's why:
While the ram fed grinder and the finish grinding hammer
mill are the stars of the show, it can't be overstated that the
ideal set-up will also include two rotary magnet hump
tunnels between the ram fed grinder and the finish grinding
hammer mill. Anyone who handles pallets is aware that they
contain metal fasteners, typically nails, which hold them
together. All metals must be removed if the end product is to
be saleable. And, while they are not hazardous to the initial
grind, it is critical that all metals be removed prior to infeed
into the finish grinding hammer mill to avoid a potentially
explosive environment.
Critical middle step
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hump tunnel magnets
Appendix
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How Does a Pneumatic Discharge Hammer Mill Work?
It's all about the fan. Air swept mills are used primarily when grinding light, fibrous or relatively non-abrasive materials to a mid range to fine particle size because lighter particles require suction to overcome the rotor airflow, and pass through the smaller screen openings. The fan pulls the material from the mill in-feed, through the grinding chamber and the screen. The finished product is then pulled through the suction pipe, into the fan; and then finally out the discharge pipe either to storage or next stage processing.
Why Choose Pneumatic?
Three key benefits: 1. A properly designed pneumatic discharge system can increase production 300-
400% over gravity discharge mills when grinding light materials to a fine particle size.
2. Without air, dusty material will take the path of least resistance, often out the feed chute. In a pneumatic system, dust is controlled and contained because all material is pulled in a common direction.
3. Whether integral or separately driven, the fan aids in material transport to storage or next stage processing.
Bonus advantage: The ability of the fan to pull the material through the screen often allows processing of materials with slightly higher moisture content than can be effectively processed via gravity discharge.
Additional pneumatic discharge hammer mill styles:
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Industrial Grinder (separately driven fan) Dual Stage Ultra Fine Grind Horizontal Scrap Grinder
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America’s fastest growing hammermill company
The expertise in
preparing wood biomass
for biofuel production.
The experts in wood grinding.
More than 80 years of expertise. Designed, custom
engineered and manufactured for customers around
the globe. We’ve been the trusted leader for size reduction
machinery for wood processing since 1928.
And today, we’re putting that experience to
work in new and innovative ways, becoming
a rising leader in the growing industry of
biofuel production.
No other manufacturer has sold more fi ne grinding
hammer mills. At work, with more than 6,500
installations worldwide. It’s durability through quality
and more productivity through effi ciency. The perfect
blend of time-proven technology with cutting-edge
innovation for today’s rapidly-changing applications.
Schutte-Buffalo Hammermill.
Keep grinding with the industry leader.
All of our equipment for biofuel production is custom configured to suit you, your material
and your production goals. You can rely on our grinders for the most consistent and uniform
end-product. From single units to complete turnkey systems – along with free material
testing and a complete line of replacement parts.
• Mills for Primary and/or Finished Grinding
• Models for Efficient Processing of Green or Dry Wood
– Medium to Fine Grinding Hammer Mills
– Full Circle Screen Hammer Mills
– Pallet & Pallet Scrap Grinders
– Heavy-Duty Bark Grinders
– Trim Scrap Grinders
Helping you get to the finished end.
Model 24-20-301B Circ-U-Flow Application: Sawdust conditioning End Product: Fuel for cyclonic burner
Model 1590 Industrial Wood Grinder Application: Hogged wood scrap End Product: Boiler co-firing with coal for fueling lime kiln
We do it all. Ready, set, grind…
Applications:
• Green Wood Chips
• Dry Wood Chips
• Hogged Wood Scrap
• Planer Shavings
• Torrefi ed Wood
• Particle Board
• Bark
• Sawdust
• Pallets & Pallet Scrap
• Rippings, Edgings
& Trim Block
• Furniture Scrap
End Products Ideal For:
• Boiler Fuel
• Pelletizing
• Briquettes
• Biodiesel Production
• Pyrolysis
Waste not.
Two Model 15300 Industrial Wood Grinders Application: Pre-grinding green wood; Finish grinding dried wood End Product: Feedstock for pellets and briquettes
The MP Series Slow Speed Ram Fed Grinder is designed for less power usage, minimal dust and reduced manpower
requirements. Simply dump your scrap into the hopper and let the grinder do the work. The low noise, low RPM MP Series
is the toughest, most durable machine you can buy for your wood processing needs. Each component was engineered with
your needs in mind – from the extra heavy frame, bearings and shaft, to the electrical controls and more.
Applications:• Pallets • Demolition debris • Custom crates and skids • Furniture and wood scrap • Miscellaneous wood scrap
End Products: • Boiler fuel • Landscape mulch • Volume reduction • Playground cover • Ideal primary grinder for: – Pellet production – Briquette production – Biodiesel production – Sawdust – Wood flour
MP Series Slow Speed Ram Fed Grinder
America’s fastest growing hammermill company
Quality, since 1928 www.hammermills.com
America’s fastest growing hammermill company
MP Series Technical Specifications
61 Depot Street | Buffalo, New York 14206 | 716-855-1555 | 1-800-447-4634 E-mail: [email protected] | www.hammermills.com
Key Features:
• Choice of 12”, 15” and 20” rotor diameter, each standard with four-way reversible tool-steel cutting teeth.
• Heavy-duty grates or perforated screens available in many sizes.
• Serrated anvil made from abrasion-resistant steel.
• Heavy-duty, American made, off-the-shelf, non-customized components (bearings, gearboxes, fluid coupling, controls).
• Programmable electronic system logic with digital read-out.
• Adjustable hydraulic pressures, cycle timing and manual retraction.
• All feed hoppers are custom built to suit application.
• Several optional types of discharge conveying equipment available - either pneumatic or mechanical.
• Optional magnets for ferrous metal extraction.
• Easily connects to finish grinding hammer mill.
Model Power Rotor Diameter Weight Grinding Deck
MP-3030-50 hp
(20-40 kW)15”
(380mm)7250 lbs
(3289 kg)36” x 36”
(910mm x 910mm)
MP-4040-60 hp
(30-50 kW)15”
(380mm)10500 lbs(4767 kg)
52” x 52”(1320mm x 1320mm)
MP-7560-75 hp
(50-60 kW)15”
(380mm)13250 lbs(6010 kg)
58” x 52”(1472mm x 1320mm)
MP-10075-100 hp(60-70 kW)
20”(510mm)
15000 lbs(6804 kg)
66” x 66”(1680mm x 1680mm)
MP-125100-125 hp(70-90 kW)
20”(510mm)
17500 lbs(7938 kg)
72” x 66”(1830mm x 1680mm)
Model MP-13Pallet Grinding System: Increase throughput up to 300% with the addition of finish grinding hammer mill.
Ideal for mid-range production operations, the 13 Series Finish Grinding Wood hammer mill is able to process virtually any
biomass feedstock to the exact finished size required. Special mill components reduce material more efficiently, allowing a
larger screen to produce the same particle size as competitor models using a much smaller size screen opening. This ability
to use a larger screen translates to lower horsepower required per ton produced.
Available in six standard sizes (13” to 48” wide), each featuring a built in fan for conveying the finished product to
storage. The compact design, featuring an integral fan unit, saves floor space and expense, eliminating the need for a
separately driven fan, ducting, motors and controls.
Applications:• Planer shavings• Dry wood chips • Green wood chips • Pre-hogged wood scrap • Sawdust • Bark • Torrefied biomass
End Products: • Briquette production • Pellet production• Boiler fuel• Biodiesel• Animal bedding
13 Series Finish Grinding Wood Hammer Mill
• Bark • Torrefied biomass
Animal bedding
Quality, since 1928 www.hammermills.comAmerica’s fastest growing hammermill company
13 Series Technical Specifications
Key Features:
• 24” rotor diameters operated at 3,600 RPM to produce high hammer tip speed.
• Available screen discharge areas from 475 to 1,824 square inches.
• Available with a variety of perforated screen sizes from .020” to 3”.
• Variety of fan sizes to maximize mill’s throughput.
• Heavy plate construction with internal ribbed liner plates.
• Four-way reversible hammers available in several styles.
Model Housing Shaft Diameter
Rotor Width
Rotor Diameter
Bearings Integral Fan System
Screen Area Shaft Speed Tip Speed
13201/2”
(12mm)2 3/4”
(70mm)12 1/2”
(320mm)24”
(610mm)2 7/16”(60mm) 2800 CFM
475 sq inches(3064 sq cm) 3600 rpm 22,600
13401/2”
(12mm)3 1/4”
(80mm)17 1/2”
(440mm)24”
(610mm)2 15/16”(75mm) 3200 CFM
665 sq inches(4290 sq cm) 3600 rpm 22,600
13601/2”
(12mm)3 1/4”
(80mm)20”
(510mm)24”
(610mm)2 15/16”(75mm) 4000 CFM
760 sq inches(4903 sq cm) 3600 rpm 22,600
13801/2”
(12mm)3 1/4”
(80mm)24”
(610mm)24”
(610mm)2 15/16”(75mm) 5000 CFM
912 sq inches(5880 sq cm) 3600 rpm 22,600
13903/4"
(20mm)5”
(130mm)36”
(910mm)24”
(610mm)3 7/16”(90mm) C/F
1368 sq inches(8825 sq cm) 3600 rpm 22,600
131001”
(25mm) 6 3/8”
(160mm)48”
(1220mm)24”
(610mm)3 7/16”(90mm) C/F
1824 sq inches(11770 sq cm) 3600 rpm 22,600
Hogged Wood Scrap
Planer Shavings Green Wood Chips
61 Depot Street | Buffalo, New York 14206 | 716-855-1555 | 1-800-447-4634 E-mail: [email protected] | www.hammermills.com America’s fastest growing hammermill company
61 Depot StreetBuffalo, New York 14206716-855-15551-800-447-4634E-mail: [email protected]
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Fueling your success.
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