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May 2006 - The
Logging and Sawmilling Journal
TECH UPDATE
DEBARKERS
TECH UPDATE EDITOR: DIANE METTLER
DEAL

|
The DEAL
Processor continues
to be an industry
leader in innovative
and state-of-the-art debarking processing.
The proven DEAL Pocket Rotary takes
debarking into a new era, says the company.
With footprints only 20 to 30 per
cent of the size of conventional, continuous
feed, multiple stem rotary debarkers,
according to the company, the savings on
building, material handling and infrastructure
costs is dramatic.
The DEAL Pocket Rotary is said to be
the only rotary debarker that can be
applied to all applications, including
sawmills. Using a number of patented
and patent-pending features, this debarker
allows mills the ability to classify and
debark, and handle stringy bark and
crooked frozen fibre with ease. The high
tooling design gives low specific point
pressure, reducing damage to the stem
surface and extends the maintenance
interval to 4,000+ hours. With both continuous
feed and the DEAL Pocket Rotary,
Dingwell’s North America continues to
offer industry the full spectrum of debarking
and wood processing services.
www.rotarydebarking.com |
DK-SPEC

|
Production can be increased without
compromising debarking quality with the
TimberFox Debarker with a double rotor
(reversed) 400 feet/minute speed.
Two reversed rotors reduce torsion
created by the first rotor, which requires
less force to maintain the log in place,
improving debarking and equipment
resistance. This special design allows
effective debarking of frozen, dry or
burnt wood. With the two debarking
rings being closer together, the TimberFox
has the advantage of processing logs as
small as 6’ in length. And this configuration
can be installed in the same parameters
as a conventional debarker with
guide rolls. The mechanical performance
is a key factor of this success. The new
electric drive feed roll technology (twoyear
warranty), an improved extra heavy
duty link arm, a better tensioning system,
an improved rotor, and an air bag concept
make this debarker an industry
leader, says the company.
www.dkspec.com |
Iggesund Tools
 |
Iggesund Tools
is proud to present
Crestool, an innovative
new system
to improve the
debarking process
and boost efficiency.
Crestool
reduces: fibre loss,
bark content, fibre
damage and maintenance
costs. It
offers adjustable tip
angles, lower tool
tension, more
durable construction
and secure
mounting. The
Crestool is also
backed by a tool
and tip repair
program.
www.iggesundtools.se |
Johnson Enterprises
|
Johnson has improved the overall
debarking process by 20 per cent, the
company says, representing a net savings
of over $200,000 for a mill that consumes
a volume of 400,000 cubic metres
of logs annually.
The Johnson debarker arm has a
patented lip on the slide. This lip controls
penetration into the logs during the
debarking process, and when bark is
removed, the fibre on the log remains
untouched. The arm itself saves on maintenance
because it has better log engaging,
involves less pressure because of the
sharp debarking tip and the engaged log
never hits the side of the tip.
The 18” debarker roll offers a number
of new features: redesigned spike bars;
reduced roll weight (5 to 10 lbs depending
on the debarker) and it is more
aggressive and requires less pressure.
Johnson’s spike rolls and spike bars have
been proven to have twice the
endurance of competitive brands,
according to the company.
Johnson’s carbide tips are frequently
used during the summer and for warmer
climate logging. They are available in 2”,
2-1/4”, 2-1/2”, 2-3/4”, and are two or
four-sided depending on tip size.
www.johnsoninnovations.com |
HMC

|
HMC is a long-time pioneer in
Rosserhead debarkers. Every machine
that HMC builds and sells begins with
sound, up-to-date engineering. Today,
HMC builds four models to meet most
size requirements. HMC debarkers feature
a slant track design, heavy-duty pivot
assembly, and a host of engineering innovations
for unmatched, rugged, reliable
and cost effective debarking operation.
www.HMCCORP.com |
Morbark Inc
|
Morbark’s Model 2355 Flail
Chiparvestor is packed with new, innovative
features that put extra horsepower
into any chipping operation.
The 2355 is designed to produce clean
pulp and paper chips at high rates, even
when processing pre-commercial thinnings,
non-merchantable and juvenile
timber.
Among the standard features are: an
enclosed, climate controlled operator’s
cabin; a twin disc hydraulic clutch; a
twin auger discharge; two separate
hydraulic tanks for enhanced oil cooling;
and a telescoping debris conveyor.
The hydraulic flail drive is also
standard equipment.
The operator’s cabin comes with a
digital tachometer and a speed control
dial for each flail drum. This system is
said to provide unmatched flexibility in
controlling flail speeds (zero to 600 rpm),
chipper rpms and feed rate.
www.morbark.com |
Nicholson

|
The Nicholson high speed
A8 debarker offers high-quality
debarking, operating at feed
speeds of up to 550 lineal feet
per minute, depending on log
size and type. This is a feed
speed increase of up to 33 per
cent over the previous in a 27”
ring size and yields an immediate
increase in production, providing
mills with a future production
increase reserve.
Fibre quality is not sacrificed because
of the increased speed. There is superior
fibre protection thanks to the A8’s
advanced feedroll design, knife arms,
debarking ring, air system and control
technologies.
The A8’s fully automatic or operator
selectable tool pressures result in a much
better control of the debarking process
and are tailored to different log types,
species, and orientations, the company
says.
The A8 Unibloc frame is constructed
of solid, 3” thick steel plates that carry
the primary operating loads, and is one
of the keys to the A8’s reliable operation
at high, sustained feedspeeds. Other A8
features include the patented Nicholson
spikeless Fiberguard feedrolls, integral
side log guides, carbide leading edge
knife arms and air cylinders that reduce
the response times for the knife arms and
feedrolls, all of which protect the
valuable surface fibre and log end.
The A8 is available in 22”, 27”, 31”
and 35” ring sizes to cover the full range
of high speed debarking applications.
www.nmwa.com |
Peterson Pacific Corp

|
Peterson Pacific continues to offer
durable and highly productive
delimber/debarkers and chippers to the
forestry industry. The 4800E multiple log
delimber/debarker utilizes many innovative
features.
The third generation design outperforms
by accepting a wider variety of
wood sizes and shapes, requiring less
fuel per hour, less working space, and
operating with lower chain costs, and
increased fibre yields—as much as 25
per cent per acre, according to the
company.
The 5000G portable chip plant is
excellent for production in both the
woods and the yard, says the company.
Production rates of up to 100 US
tons/hour, with excellent chip quality,
are possible with the 5000G.
The company’s patented pressure
compensation system allows a single
engine to do all the work, reducing fuel
consumption and maintenance.
www.petersonpacific.com |
Price Systems

|
Price’s environmentally friendly and
rugged drum debarkers are designed,
engineered and manufactured to meet
the most rigorous standards in the
industry today. They meet the demands
of heavy production schedules yearround
with less downtime, according to
the company. This high production
equipment is energy-efficient, easy to
maintain, and can dramatically increase
throughput when coupled with their
patented positive feed conveyors—
according to the company, production
rates typically improve by 25 per cent. In
addition to the increased production
rates, operating costs are also reduced,
says the company.
Available in feed configurations
of 9’, 11’, 12’, and 13’ diameters
and in lengths that range from 30’ to
100’, they feature variable speed and
reversible electric drives that help eliminate
winter debarking challenges.
www.price-systems.com |
Savico
|
The company’s distinctive line of specialized
rotor-action debarkers includes
the 20’, 30’, 40’, 60’, 80’ and 90’ models.
The three rotor designs and patented
abraders provide higher production with
low fibre loss, says the company.
They are designed to process wood of
all species, shapes, forms and sizes, and
are said to perform outstandingly well
with eucalyptus and frozen logs.
Savico’s rotor-action debarkers are
ideal for softwoods and hardwoods and
all types of birch. They operate at .05 per
cent fibre loss and .05 per cent bark
retention.
They feature robust and heavy-duty
construction, and are also modular so the
system can be expanded easily. The company
says the debarkers have the lowest
maintenance cost in the marketplace.
Adding to the company’s line, a new
yard cleaning model was introduced this
year specifically designed to remove bark
and separate rocks and dirt.
www.savico.com |
USNR

|
USNR offers a complete range of
debarking options, from the historically
popular Cambio debarker and the MV
ring debarker, to the high-speed HSSeries
ring debarker.
The HS-Series debarker is one of the
most reliable and easy-to-maintain models
on the market, according to the company.
It has redefined high-speed debarking
in the modern sawmill so operations
don’t have to compromise feed speed for
debarking performance. It is available in
four sizes, designed to accept maximum
log diameters of 14”, 18”, 24”, and 30”.
The compact design allows these flexible
machines to handle logs less than 3” in
diameter and 6’ in length.
USNR offers three tensioning system
options on new USNR debarkers and as
upgrade kits for Cambio-style debarkers
made by different manufacturers:
• Air-Bag tensioning: the fastest action,
best-performing system.
• Spider tensioning: industrial rubber
bands to maintain tool contact with the
log.
• Hydraulic tensioning: a combination of
industrial rubber bands and hydraulic
cylinders to maintain and control tool
contact with the log.
www.usnr.com |
Valley
Machine

|
Valley
Machine’s Wild
Bark HD is for the
serious operator
who appreciates a rugged design, modern technology, and
superior production capability, says the
company. It’s used in high production
hardwood or pine mills with log diameters
up to 54”. The standard machines
handle logs up to 16’ nominal. Machine
extensions up to 24’ are
optional.
The machine is built on a solid,
heavy-duty welded steel frame. The
frame supports a vertically arranged
buggy track. Six rugged, large diameter Vtrack
rollers allow for smooth running of
the buggy. The debarker head is mounted
on the buggy and driven by a 50 hp electric
motor via V-belts. A heavy-duty air
cylinder does the lifting and lowering of
the debarking head. The cylinder controls
are electric over air solenoid valves and
an integrated proportional pressure control
valve allows the operator to change
the head down pressure during the
debarking process.
The bull wheel assembly is of sturdy
construction with shaft diameter up to 5-
3/16”. The bull wheels are fastened with
power locks, to eliminate any keyways in
the shaft, and are supported by multiple
plastic-lined bearings.
www.valleymachine.com |
Valon Kone Brunette Ltd

|
The high speed Kodiak Debarker produces
the results that customers demand,
says the company. The company’s design
philosophy focuses
on strength and solid
steel construction that
is built to last.
Kodiak tool arms
are fabricated from
forged Astralloy for
strength and durability,
with no breakage.
The tool tips incorporate
replaceable carbide
inserts and are
mounted by two
bolts. The tool arm is
mounted on a 4’ solid steel shaft that is
straddle mounted by two dual-row bearings
to eliminate overhung loading. The
bellcrank is machined out of a solid block
of steel—no breakage. Lightweight high
tensile aluminium cylinders are used to
actuate the bellcrank assembly on Kodiak
models 22” and larger. These cylinders
are robust and can be rebuilt over time.
The air management system efficiently
supplies large volumes of air to the tool
actuators through the patented air seal.
The dual race rotor bearing has a tight
running tolerance to limit the thrust
forces on the air seal, providing longer
life.
All feed works components are heat
treated and stress relieved. The individual
drive gears are manufactured from forged
shafting, which is heat treated and hardened
to eliminate breakage. The large
diameter feed rolls provide more surface
contact on the log, which provides better
holding power and run considerably
smoother.
www.vkb.com |
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