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May 2006 - The Logging and Sawmilling Journal






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.


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.

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.

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.


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.

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.


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.

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.

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.


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.


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.


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.

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.

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This page last modified on Wednesday, October 18, 2006