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The advantages compared with the superheated steam-vacuum drying a) to conventional kilns and b) to simple vacuum processes (partly vapor air mixture) are known and indisputable.
Now we have developed the superheated steam-vacuum process further:
It is our widened, rectangular vacuum kiln housing, a specially efficient steam generator system with revolutionary operating software (steam saturation and pulsation) combined – which resulted in the new
This technical super performance is suited for all lumber species and thickness, particularly for
 thick and dense hardwoods
Softwood more than 60-120mm (2 – 12 inches) thick
difficult to dry hardwoods with high moisture contents, for example
green and very green oak,
red and white OAK,
Various Eucalyptus species and
Coigue
proven and tested special programs for color sensitive lumber
gentle indirect full steam in vacuum – thereby especially stable results
Lumber moisture / stress gradient across the board cross section
Final moisture distribution at shorter conditioning times
Wonderful Steam...
HIGH – STEAM – PULSATION means Drying and Improving
HIGH VAC® - MASTER
Registered trademark for lumber drying technology
(HIGH VACUUM TECHNOLOGY)
Newest technology...
National and International Patents for example :
- Magic Point / Steam – Plastification
- Steam – Pulsation, Steam - shock
- Pressure– Swing – Climate
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Vacuum – Steam dried Timber with your quality stamp |
Vacuum kilns are a product of BRUNNER – HILDEBRAND for 30 Years . The HIGH VAC®– S (S = Standard) has been manufactured since 1990. A new drying and quality improvement technology has been implemented in the HIGH VAC® - MASTER. The mechanical base conception and other informations is explained on the page HIGH VAC vacuum kilns or in the broschure HIGH VAC® - S (download-pdf).
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HIGH VAC® – MASTER " complete improvements “ |
Every experienced kiln operator knows:
The proper heat up and following assimilation phase are responsible for quality. Therefore steaming and steam shock is the best. Even High-pressure spray (hot or cold Water) is not as efficient. A successful drying cycle depends on the different
approaches:
Steam is the perfect solution compared to water.
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Our HIGH VAC® – Master knows these approaches. Heating is with saturated steam. Critical lumber species
will dry at temperatures from 150 to 200F without the danger of cracks or honeycomb due to controlled steam shocks
Changing the steam climate will result in a gentle drying.
Operating at the Steam “Magic point“(Temperature range of plastizising). Will result in shorter drying times without the defects. |
Small vacuum kilns with Heat pump (construction lumber) have some advantages. To achieve the quality and drying times the Steam pulsation (HIGH-STEAM-PULSATION®) requires High temperatures.
Heat pumps are not capable of operating at these conditions (coolant, no steam etc).
The HIGH VAC® - Master has the solution for problems which nobody wanted to address previuosly.
The Steam pulsation technology switches between regular steam and saturated steam
Resulting in a continuously conditioning / brake/ Reconditioning pattern profile which allows for
absolute stress released lumber. The measured and controlled lumber internal steam pressure is responsible for the differentials necessary to assure targeted and controlled moisture drop from the core to shell of the lumber. The useless air pressure of conventional kilns is eliminated.
The controlled swings – controlled by sophisticated software is foremost of the technical solutions
Remark: Air humidity (conventional) is not steam humidity (HIGH VAC® - Master).
The most important parameters are the measured values for lumber temperature in connection with the lumber moisture contens of shell and core measurements . |
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HIGH VAC®– MASTER
“ Always one step ahead” |
ADVANTAGES:
- Fast, secure drying cycle
- High stability, minimal shrinkage
- Even moisture distribution
- Improved final product
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Our innovations:
- Two extremely powerful steam generators, networked steam Generators with returns. Steam pulses with up to 12 Gallons per minute of instant steaming
- Generous loading / Handling capabilities compared to rounded casings.
- Capable of controlled programmable intensity for Steam –pulsation but also for steaming to achieve homogeneous coloration or special colors
- Magic Point – control of the process by measured lumber temperatures
- Modulated cooling system for fast steaming speeds. Outer and inner energy management
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“EUCALYPTUS – Drying
A new experience ” |
Vergrößerung dieser Skizze als PDF-Datei downloaden
Field reports of our satisfied customers with the
HIGH VAC® MASTER
Example 1:
This company is drying Spruce in seven conventional kilns (90 – 200 mm green to 17 % MC as construction lumber (KVH.DIN 4074).
Then a HIGH VAC®- Master went into operation in 2006.
Result:
After testing and comparison, the company is now achieving 3 to 5 times faster drying times than with their conventional kilns. Due to the steam pulsation, a more even moisture contribution was possible without drying defects, and this as well in the upper layers without concrete weights or tension springs. Requirements according to DIN 4074 are met or are even bettered. The HIGH VAC®- Master dries this lumber well, very economically to 12% core moisture content.
Comments of customer for construction lumber – List (24mm to 200mm spruce in one charge):
“...Top – Quality, hardly any splits, cracks – no bow, no twist
everything 100% quality.“ Compared to conventional with 1cm x 30cm “Finger thick cracks, splits“
Example 2: Exotic ( Sapelli,...)
This company dries with 3 HIGH VAC® - Standard especially Mahogany – Sapelli (80mm to 105mm, green to 16%) for windows and stairs ... End 2006 one of the HIGH VAC® - S was modified to HIGH VAC® - Master with Steam pulsation Software.
Result:
Already the first comparison results showed: Drying time decrease by approx.20% without any drying defects. Moreover, even moisture content contribution. No twists or cupping = satisfied customer.
March 2007 we got the order to modify the remaining two HIGH VAC® - Standard to Steam pulsation, confirmation of the improvements produced by Steam & Master series technologies.
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