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December  2003 January 2004



Tech Update Editor: Sean Goldie

Please fill in our Reader Request Form located at the bottom for more information on these products.  

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 cambiumthe 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.

Tech Update - Debarkers








Rotary or Craddle










Andritz Kone AG








Cardinal Sawmill Equipment Inc.    








Carmanah Design and Manufacturing Inc.








Dingwell's North America








For-Min Inc.








HMC Corporation








Morbark Inc.         








Nicholson Manufacturing Company


or www.debarking.com







Peterson Pacific Corp.








Price Systems, Inc.








PSI Sales, Inc.








Sawquip International Inc.








T.S. Manufacturing Company








USNR (1)








Valley Machine Works Ltd.








Valon Kone Brunette Ltd.









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 debarkingthe 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 operators 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

Dingwells North America
The Dingwells 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 centres 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 lossa requirement in todays 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-Mins 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-Mins 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
Morbarks 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 operators 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 operators 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 debarkers 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 companys 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
Prices 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 conveyorsproduction 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. PSIs 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 Manufacturings 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 offers a complete range of debarker options ranging from the Cambio debarker, which was first introduced in the 1950s, to todays 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 .
USNRs 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.

Type of Business
Postal Code
Work Phone

Check any of the following for more information:

Andritz Kone AG  #10060
 Carmanah Design & Mfg Ltd   #10061
Dingwells 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
  Valon Kone Brunette Ltd.  #10073


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