In
most modern primary forest products operations, debarking occurs prior
to sawing, veneer peeling or chipping. While there are several
advantages, the principal reason for debarking in a sawmill context is
to create a more valuable/marketable product that can be used in making
pulp. Many pulp mills will not purchase chips containing bark due to the
additional costs (more bleaching) associated with the removal of the
colour. Generally, customers of paper products use colourless (white)
paper achieved by removing the pigmentation. The actual process of
debarking can be accomplished by several methods with the general
objective of removing the back at the cambium—“the inner most bark
layer.” The trick is to eliminate as many areas of fibre loss/damage as
possible from the “soft tip opening,” minimizing log end damage to
excessive tool pressure and high throughput which creates the “barber
pole” debarking phenomenon. Strategies are developed to optimize
throughput by orienting the log either butt or top end first, or
controlling the spacing between the stems for peak efficiency. All of
these objectives are also accomplished under such difficult
environmental conditions as frozen wood. For further information on
equipment included in this Tech Update, please consult a local
representative or visit the supplier online at the websites listed
below.
Andritz Kone AG
The Andritz tumble debarking drum is designed to meet the debarking
requirements of all chemical, mechanical, TMP and CTMP processes. With
over 400 systems in place globally, their experience ensures the correct
dimensioning of the drum according to wood species, operating conditions
and customer requirements. Correct dimensioning results in a
cost-effective drum design that can debark logs at a high capacity to
achieve the required cleanliness with minimum fibre losses. This tumble
debarking method is an effective process for short wood with good
cleanliness results. The parallel debarking method is used when stem
length exceeds the drum diameter. This gentle process also has low fibre
loss and is used with long, straight logs. This year Andritz has
introduced a unique method of rotary debarking. The new Andritz
Rotabarker has been installed in one northern woodyard with further
orders for another. This new rotary debarker is made of a heavy frame
supporting four abrader rotors, which move the logs with the help of the
rotor discs. Debarking efficiency according to the type/condition of the
wood is accommodated through adjusting the rotors’ speeds. The rubber
tire-supported debarking drum is best suited for capacities ranging from
50 up to 250 cubic meters solid wood over bark per hour (20 to 100
cords/h). The axle-supported drum is used for larger size/lower
capacities, whereas the higher capacity drums utilize a bogie type
support arrangement. This debarking method is designed to process all
wood species in temperate and arctic zones, as well as various types of
mixed tropical hardwood species and difficult wood species, such as
eucalyptus. Reader Service Card# 10,060
Carmanah Design &
Manufacturing Limited
Carmanah Design and Manufacturing Ltd (formerly CAE Machinery), the
company that was a
pioneer
in rotary debarking in North America in the early 1990s with the Fuji
King debarker, has unveiled their latest development in rotary
debarking—the ACTI-PLATE system. This system provides a high degree of
flexibility and performance, says the company. Essentially, the system
allows customers to make changes to the mechanical aggressiveness of
their Fuji King instantly, and from the convenience of the operator’s
booth. This provides a way to deal with changing wood characteristics “
on the fly.” This feature has been supplied in two KD4/60DT King
debarkers installed and operating at a new OSB plant in Meadow Lake,
Saskatchewan. Reader Service Card# 10,061
Dingwell’s North America
The Dingwell’s DEAL Processor Rotary Debarker is engineered for
performance and adds batch and side discharge technology that
incorporates a number of patented or patent
pending
features that include live floor, interleafing, and open bottom, rising
array, and multiple rotor technology. This machine centre’s performance
adds directly to the bottom line through obtaining the maximum amount of
clean white wood fibre from the harvested stem. Covering a number of
uses, this debarker is suited for landfill and residual fibre recovery,
conventional mill debarking, which includes full wood room upgrades, and
may also be used as the main infeed to any large combination of fibre
processing and cogeneration plant configurations. This proven design
yields superior performance in loose reclaimed material, extremely
stringy fibrous bark species (such as cedar, basswood or tropical
acacia) through to and including conventional fibre diets. With an
assortment of specialized accessories, these “bolt on” or “permanent”
abrasion tools can deal with any situation. This equipment features low
contact pressure, minimizing any fibre loss—a requirement in today’s
competitive forest environment. Modules are available with rotor options
that include variable body sizes to accommodate a variable stem diet,
interchangeable rotor tooling and modular fabrication that deliver the
flexibility to suit any need. They are outfitted with heavy-duty
operator-managed hydraulic or mechanical electric drive systems in
permanent, semi-portable or mobile portable configurations. Reader
Service Card# 10,062
For-Min Inc
For-Min’s 18-inch capacity, synchronized double ring debarker with air
tensioning system has fewer consumable parts, which reduces maintenance
without compromising debarking performance. It is capable of operating
year-round at 350 fpm on short or long logs. It is capable of removing
100 per cent bark from around knots and 100 per cent overlap without
fibre damage. For-Min’s debarking system emphasizes simplicity and
durability. Reader Service Card# 10,063
HMC Corporation
HMC is a long-time pioneer in Rosserhead Debarkers. Today, they build
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. Reader Service Card# 10,064
Morbark Inc
Morbark’s Model 2355 Flail Chiparvestor is packed with new, innovative
features that put the 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 provides unmatched flexibility in controlling flail speeds (zero
to 600 rpm), chipper rpms and feed rate Reader Service Card# 10,065
Nicholson Manufacturing Company
The Nicholson A8 Highspeed Debarker offers high productivity while
operating at feedspeeds of up to 550 lineal feet per minute, (dependent
on stem size and type). This represents an increase in speed of up to 33
per cent over the previously thought feedspeed possible in a 27 inch
ring size. This yields an immediate bump in the production rate, which
positions the plant for a future production reserve. Although this
production speed increase represents an improvement, it does not
sacrifice the quality of the fibre (superior protection)—this is
accomplished through an advanced feedroll, knife arm, ring, air system
and additional control technologies which all work together. The
debarker’s fully automatic yet selectable tool pressures result in much
better control of the debarking process and it is tailored to different
log types (species mix, log orientations and geometry) and their
condition, which all provide adaptable options to fit specific debarking
needs. The rugged Unibloc frame constructed of full height, solid,
3-inch thick steel plates carries the primary operating loads. This key
component leads to the reliable operation at the feedspeeds, achieved by
the A8. Additional heavy log tunnels that tame crooked stems are an
integral part of the frame structure. These features are complemented
with the patented spikeless Fiberguard feedrolls, log guides, Carbide
Leading Edge knife arms and air cylinders that reduce the response times
for both the ring and feedrolls, saving both the valuable log end and
the surface fiber. The automated ring lubrication system will shut down
the debarker if any problems occur.Reader Service Card# 10,066
Peterson Pacific Corp
Peterson continues to offer durable and highly productive delimber/debarkers
and chippers to the forestry industry. The 4800E multiple logdelimber/
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, operating with lower
chain costs, and increases fibre yields by as much as 25 per cent per
acre. The 5000G portable chip plant is excellent for production in both
the woods and the yard. 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. These benefits make
the 5000G the ideal machine for whole tree chipping. Reader Service
Card# 10,067
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
demands of heavy production schedules year-around with less downtime.
This high production equipment is energy-efficient, easy to maintain,
and can dramatically increase throughput when coupled with their
patented positive feed conveyors—production rates typically improve by
25 per cent. In addition to the increased production rates, the
operation costs are also reduced, says the company. Available in feed
configurations of 9 ft, 11 ft, 12 ft, and 13 ft diameters and in lengths
that range from 30 ft to 100 ft, it features variable speed and
reversible electric drives that help eliminate winter debarking
challenges. Reader Service Card# 10,068
PSI Drum Debarker
The PSI rubber tire supported drum debarker product line includes many
features and innovations. According to the company, these features
contribute to an overall system design with high productivity, debarking
efficiency and fibre recovery. These features include:
• Stationary, transportable or mobile configurations available
• All electric drives utilize AC Flux Vector Controls for variable speed
with standard T-Frame motors
• “Less Lifter” shell design provides higher yield than competitors’
models
• Symmetrical drum shells permit “wear rotation”
• Drums are supported by “Goodyear” super Single Tires
• Drums can be driven in either direction • Highest percentage of bark
slots available in a rubber tire supported drum Standard drum diameters
are 9 ft., 11 ft. and 13 ft., with lengths of 15 ft. through 100 ft.
Production rates are dependent on the type of infeed system, drum size
and wood specifications, but system requirements of 25 to 250 tons per
hour can be achieved with proper drum selection. PSI’s new proprietary
“Less Lifter” drum shell allows PSI to boast white wood losses of less
than two per cent. Reader Service Card# 10,069
Sawquip International Inc
This
RotaryAction debarker, which ranges in size from 30 ft to 60 ft,
combines three 24-in diameter rotor modules. The horsepower of each roto
section is stepped to provide maximum debarking efficiency. This
three-rotor system substantially improves throughput while powering the
patented abrader tips which are designed to minimize fibre loss. A
proven performer in cold weather, this design is simple to operate yet
easy to maintain. Typical performance for a RAD-60 (60 ft model):
• Hardwoods - medium diameter 80 to 100 green tons/hour to -10° C
• Softwoods – small diameter 65 to 75 cbm/hour to -10° C
• Bark content (weight basis) 0.7 per cent
• Fibre loss (weight basis) 1.5 per cent or less Reader Service Card#
10,070
TS Manufacturing Company
TS Manufacturing’s rosserhead style debarkers are designed to withstand
the rigors of everyday usage with the HD636 and HD848 models requiring a
minimum maintenance schedule. Available with the latest depth control
debarking heads, while maintaining their low maintenance methodology,
these models perform at or above the efficiency of higher maintenanced
counterparts. These debarkers have turning rolls with replaceable teeth,
as well as bite aggressiveness control options to minimize fibre damage
in various species. TS Manufacturing debarkers may also be fitted with
two distinct styles of butt reducer to further enhance the efficiency
within mill operations, by either increasing the speed or reducing the
costly blade maintenance, or both. These products feature Bicon bushings
that allow the turning roll spacing to be adjusted to suit a variety of
log specifications. Bicon bushings also allow TS Manufacturing to
provide keyless 2 7/16” TNG shafting, giving greater strength and
rigidity over keyed systems. Reader Service Card# 10,071
USNR
USNR offers a complete range of debarker options ranging from the Cambio
debarker, which was first introduced in the 1950s, to today’s complete
family of offerings including ring debarkers. The Cambio debarker is
manufactured by both Forano and Kockums Cancar, members of the USNR
family, which continued to refine the Cambio technology, dramatically
improving its performance over time. In addition USNR has developed two
other debarkers derived from the original Cambio design: the F-Series
High-Speed Debarker, and MV-Type Debarker These debarker models offer
advantages in throughput and performance over the Cambio, although the
Cambio remains a popular and very economical choice for many operations.
All of these debarkers are designed with flexibility and accommodate a
variety of options, depending on the specific model. USNR offers three
different tensioning systems:
• Air-Bag Tensioning: the fastest-action, best-performing tensioning
system.
• Spider Tensioning: uses industrial rubber bands to maintain tool
contact with the log.
• Hydraulic Tensioning: uses a combination of industrial rubber bands
and hydraulic cylinders to maintain and control tool contact with the
log surface, this system gives excellent performance and great
durability .
USNR’s compact Cambio debarkers are available in 18-inch, 24-inch and
30- inch sizes. The F-series heavy-duty ring debarker is available in
14-inch, 18-inch, 24-inch and 30-inch ring sizes. The MV-type ring is
available in 18-inch, 24-inch and 30-inch sizes. Reader Service Card#
10,072
Valon Kone Brunette Ltd.
The Brunette Reclaimer is a bin-type debarker, developed by VK Brunette
to increase fibre supply by performing quality debarking on such
difficult material as log yard debris and pulpwood. It features arugged,
simple design that efficiently separates valuable wood fibre from dirt
and rock as it debarks. Identical modular construction minimizes the
need for large spare parts inventory and robust design makes the
Brunette Reclaimer easy and inexpensive to maintain. The VKB Kodiak
Debarker represents decades of manufacturing experience and research
with the latest emerging technologies. The result is unsurpassed
high-speed debarking with the highest uptime in the industry. This
uptime is possible due to the extra heavy-duty construction means. This
equipment is known for its speed, low operating costs and excellent
debarking quality demanded. VKB can provide debarkers in a size and
configuration to suit any application. Reader Service Card# 10,073
For more
information on the above
products, please fill in the contact information and check off the boxes
that apply. When finished, please click on the Submit Form
Button.
Check any of the following for more information:
Andritz Kone AG
#10060
Carmanah
Design & Mfg Ltd
#10061
Dingwell’s North America
#10062
For-Min Inc
#10063
HMC
Corporation
#10064
Morbark Inc
#10065
Nicholson Mfg Co #10066
Peterson
Pacific Corp #10067
Price
Systems
#10068
PSI Drum Debarker
#10069
Sawquip
International Inc #10070
TS
Manufacturing Company
#10071
USNR
#10072
