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TECH UPDATE

DEBARKING EQUIPMENT

Tech Update Editor:  Helen Johnson

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

Valon Kone Brunette Ltd 
The new Kodiak debarkers from Valon Kone Brunette include models with 17", 22", 27", 32" and 36" rotor sizes with single or dual debarking rotors that are built to handle large difficult logs of any species and in any condition, including burnt and frozen logs. The original self-centring infeed conveyor ensures correct log position for high-speed applications and top-mounted feedroll cylinders allow safe and easy access for maintenance. On dual ring applications, rotors counter-rotate for superior log holding and debarking, the company says, an application that is ideal for burnt wood. A built-in butt-reducing rotor is also available for oversized and flared log ends. The rotors utilize heavy-duty dual race ball bearings, while feedroll bearings are mounted in replaceable steel housings. PLC control of tool pressure and holding pressure allows optimization of feed speed depending on log diameter and a mini-beam array allows accurate log diameter sensing. Unobstructed access to drive gears and feedrolls makes maintenance safer and faster, the company says. A heavy modular frame offers strength, simpler, less expensive shipping and installation and allows for the future addition of a second rotor. Other features include dual access doors on the rotor for quick service access, unobstructed access to drive gears and feedrolls, side-mounted drives, spikeless feedrolls for negligible fibre damage and accurate log centring, replaceable forged feedroll flytes and improved long-life air seals. Reader Service Card #050

Morbark Inc 
Ideal for chip plants and sawmills, the Morbark 640 debarker debarks softwood or hardwood, large and small logs, stringy-barked logs-such as cedar and cypress-as well as frozen material. Featuring a floating cutterhead and a variable log spiral that produces smooth, knot-free logs, the 640 is equipped with a variable speed adjustment to provide speed for small and relatively straight logs and power for longer and crooked logs. With knots and nubs removed, hang-ups in the mill flow system are reduced. Production is increased with all types of sawrigs, the company says, especially scrag and gangsaws. The high-speed debarker debarks logs from 6" to 40" in diameter. The 640 comes with infeed and outfeed conveyors and its own support legs. An upright conveyor will slide under the centre section where the bark is removed. Loose bark that may become detached from the log on the debarker's infeed will be carried to the centre section by the infeed conveyor. Optional is an all-weather operator's cab in either standard or deluxe. The console is attached to the cab and includes all the controls to operate the debarker, as well as decks or infeed and outfeed conveyors. The control console can be located right at the debarker or in another location. Reader Service Card #051

Peterson Pacific 
The Peterson Pacific model DD 4800-DH multiple log delimber/debarker utilizes innovations such as a patented floating upper flail, adjustable feed and flail speeds and hydrostatic flail drive. Capable of simultaneously processing logs from 2" to 23" in diameter, the third generation design can produce 40 to 60 tons per hour with a bark content of less than one per cent, the company says. The DD 4800 accepts a wider variety of wood sizes and shapes, requires less fuel per hour as well as less working space, operates with lower chain costs and increases fibre yields by as much as 25 per cent per acre. A 325-hp Caterpillar 3306 engine is standard. Optional is a 325-hp Cummins LTA10. With features similar to the DD 4800, the DD4850 multiple log stationary debarker features an offset pattern of flail chain. Five lower feed rollers with total control floating upper feed and discharge rollers contribute to the high quality and volume of small log debarking. The DD 4850 can be customized with hydraulic or electric drive and two or four debarking drums. Reader Service Card #052

Sawquip International Inc 
Sawquip's new Rotoraction debarker processes tops, bucking residuals and other small, irregular short and long hardwoods or softwoods for fibre recovery around sawmills. Its patented three-rotor configuration and debarking abraders have high throughput for bark retention down to 0.5 per cent, the company says, while maintaining low fibre loss even in cold weather applications. Sawquip's steel fabricated abraders are mounted in a spiral on three cylindrical rotors, which are positioned side-by-side at a vertical angle, minimizing fibre damage. The abraders strike the log surface, removing bark by impact and friction while forcing logs to turn against each other in a scrubbing action, furthering the removal process. The abraders also cause logs to move upwards in the debarker over the three rotors before tumbling down to repeat the abrading process. The centre and upper rotors perform most of the debarking. The Rotoraction model debarks logs 3" to 40" in diameter.Reader Service Card #053

USNR 
USNR's F-Series debarkers redefine high-speed debarking in the modern sawmill, with reduced fibre damage, easy maintenance, performance and reliability, the company says. Engineers have combined years of experience in the manufacturing and servicing of ring-type debarkers to develop reliable, easy-to-maintain models. The F-Series is available in four sizes designed to accept log diameters of 14", 18", 24" and 30". A compact design allows these machines to handle logs less than 3" in diameter and 6' in length. Designed to withstand the abuse of high-speed operations, the F-Series models feature a solid double-box S-shaped structure to resist torsional strain, reducing vibration and improving fatigue resistance. CNC machining ensures perfect alignment, further reducing component wear, the company says. Four pairs of inter-linked self-feeding and self-centering feedrolls are powered through 12 hardened 2 1/2" thick steel gears, helping to make them both shock and wear resistant. Feedrolls are held in place by standard Ringfeder locking hubs, allowing them to be adjusted or replaced without keyway or press-fitting. No other auxiliary system is required. The air-sealed type rotor is statically and dynamically balanced, featuring a fully remote controlled tool pressure system for premium debarking quality. The air-seal rotor comes with a standard six-tool system. Individual tools have splines for optimal fit to the tool holders. Reader Service Card #054

CAE Machinery 
The CAE/Fuji King debarker offers innovative debarking technology, utilizing rotary action that creates a unique combination of mechanical and log-to-log contact to efficiently remove bark from logs of all shapes and species. The result is cleanly debarked logs with little fibre loss from difficult and widely varying furnish in all operating conditions, the company says. The machine features full contact of rotors along the entire length of the log, ensuring small diameter, crooked and swept logs can be effectively debarked. If offers gentler action than conventional drum debarkers, ensuring fewer damaged logs, less fibre loss and lower operating costs. Bark is expelled via a separate conveyor. The CAE/Fuji King debarker is the only rotary debarker with inclined abrasive plates, required when debarking tough species in freezing conditions, the company says. The modular design ensures the system can be sized to fit any application. The King is in use in more than 200 installations worldwide, including 38 systems in North America, many of which are operating 24 hours a day in pulp woodrooms. Reader Service Card #055

Nicholson Manufacturing 
The new A8 high-speed debarker from Nicholson takes the previous limit of 425 fpm to a new feed speed of 550 fpm for a single ring debarker-making it almost 30 per cent more productive, the company says. The A8 offers improvements in raw speed, frame design, drive simplification, service access and streamlined manufacturing resulting in lower machine costs. A key element is the rugged Unibloc frame made of solid 3" thick steel plates. No columns are used, increasing the mass and strength of the frame, as well as the overall weight and mass of the debarker, and ensuring reliability at increased speeds. Two large full height and full width doors on the roll side of the debarker provide unrestricted access to the feedrolls. The debarking ring has a powered pullout feature for fast, safe access. The gear side and top of the debarker are accessed through large doors and removeable panels. Patented Fiberguard feedrolls are standard on the A8 and feature a spikeless design with replaceable traction inserts for quick season and furnish adjustments. 

The traction inserts bolt on, with no cutting or welding required, saving time and money at every roll rebuild cycle, the company says. The Nicholson A6 medium feedspeed sliding ring debarker is a rugged in-line debarker that doesn't stop the log or take it off-line as in cutterhead-type systems. The smooth action of the spinning ring removes the bark at the cambium layer without disturbing valuable wood fibre. Available in 17", 22", 27", 35" and 44" ring sizes and in single or tandem ring configurations, the A6 processes logs as short as five feet. The machine is easy to install, the company says, due to its fixed-height feedworks and sliding ring design. The A6 features automatic feeding and debarking, an array of pre-set knife arm pressure overrides to fine tune debarking of each log and hydraulic cylinders on the hold-down rolls that smoothly and accurately hold down even crooked or frozen logs. Reader Service Card #056

Carbotech Inc/For-Min Group
 Efficient for both hardwoods and softwoods, the ring-type debarkers from Carbotech feature heavy-duty construction and either single or double rotor configurations. A new development is the clockwise/counter-clockwise debarker system that provides less twist and higher quality debarking, while providing speeds of up to 350 fpm for the 18" model. Double rotor machines have feed speeds approximately 20 per cent higher than single rotor debarkers, the company says. Available in 18", 24" and 30", Carbotech's debarkers require no adjustment from one log to another, regardless of species, and can be supplied with pneumatic "air bag", hydraulic or spider-type tool tensioning. 

Two-speed drive permits adaptation of feed speed to debarking conditions. Reversible for longer life, the feedrolls can be driven by individual hydraulic motors or by a two-speed electric motor. A variable speed drive is also available. Logs are fed and held with wear-resistant alloy steel spikes. Feedrolls can be supplied with "perma spikes" for a five to seven times increase in wear life. Heavy-duty link arms position feedrolls to keep logs perfectly centred. Long stroke pneumatic cylinders with heavy-duty 2" diameter rods ensure correct feedroll pressure, regardless of log diameter, while minimizing fibre damage. The 18" models have five tools, while the 24" and 30" models can be supplied with either five or six tool designs. Feedroll drive components are machined from alloy steel and are oil bath lubricated. A third bearing on the feedroll shaft increases its resistance to breakage. Other features include heavy welded steel frames, easily accessible mechanical components, reinforced anchor points and full-length welded joints. Bark deflectors are also available. Carbotech offers consulting and engineering services, start-up assistance and after-sale service. Reader Service Card #057

TS Manufacturing 
The 848 Rosserhead debarker from TS Manufacturing incorporates the latest in heavy-duty accessories for a minimum maintenance design. The drive system features a high capacity, entirely hydraulic system in each axis of motion on the debarker, ensuring a minimum of trouble in all climate conditions. The turning roll shafts are 4 7/16" in diameter and maintain their diameter throughout the length, allowing for maximum strength, as there are no keyways machined to weaken the shafts. The turning rolls are instead fastened by Bikon bushings-a double-taperlock design that is slip-proof and allows easier spacing changes for unforeseen log supply changes-thus allowing for in-place changing of wheel spacing, completing the task in just minutes. The shafts are connected to the frame with high-quality, heavy-duty Anson bearings or bushings, depending on customer preference, creating the lowest maintenance rates due to log drop impacts, the company says. The standard debarking head is a Bark King non-aggressive debarking head to minimize fibre loss. Optional features include maintenance teeth inserts for the turning wheels to maintain consistent turning aggressiveness and inserts for onsite adjustment to reduce the aggressiveness of the turning wheels in the case of logs used for veneer purposes, allowing for optimization of log grade and minimum fibre loss. Reader Service Card #058

Dingwell's North America 
The DEAL Processor exclusively from Dingwell's North America brings debarking into the 21st century with advanced rotary technology and a number of patented features, including live floor, interleaving, open bottom, rising array and multiple rotor technology. It features high fibre recovery, low maintenance and effective debarking in difficult diets including frozen, crooked hardwoods and dormant small-diameter softwoods, from 2" though 5'. Its low contact pressure delivers minimal fibre damage losses. With an array of footprints and an arsenal of specialized bolt-on debarking abrader tooling, the DEAL Processor's flexible modular design is well suited to any debarking application, the company says. Modules offer rotor options as to size and number, variable body widths and interchangeable rotor tooling. DEAL True Rotary design gives superior performance in loose reclaim material, extremely stringy, fibrous bark species-such as cedar, basswood or tropical acacia-though to conventional fibre diets. It can be fitted with heavy-duty, operator-managed hydraulic or mechanical electric drive systems and in permanent, semi-portable or mobile portable configurations. Reader Service Card #059

Lindsay Forest Products Ltd 
The newly designed debarker tool and shaft assembly from Lindsay Forest Products features an exchangeable four-sided carbide tip. The tip assembly has a revolutionary figure eight, positive-register design that eliminates the pre-loading of the tip and greatly reduces fatigue, the company says. The arm and tool holder shaft assembly features heavy-duty 50mm bearings and spline section that retrofits directly to the 18" Cambio/Forano debarkers without modification. The assembly allows bark to escape easily, avoiding costly downtime due to excessive bark accumulation, the company says. Overall weight of the assembly has been reduced from previous designs, resulting in more efficient debarking and reduced maintenance costs. Reader Service Card #060

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