High Pressure Systems

High Pressure Humidification systems are based on atomizing water using pressure. The pump skid pressurizes water to 1000psi where it is then atomized into a fog-like mist for easy absorption. These systems are very inexpensive to operate and are low maintenance.

  • Controls plant humidity to within ±2%
  • Tip Spring and Rubber Seal in Nozzles prevents leaking
  • Produces a fine fog-like mist for easy absorption
  • Inexpensive operational costs and low maintenance
  • Engineering, Service, and Spare Parts available from Pineville, NC

The humidity control cabinet, in conjunction with the remote mounted humidity sensor, continually monitors the plant humidity. The system is automatically activated when the humidity falls below the set point. The controller activates the pump skid allowing water at 1000 psi into the Stainless Steel high pressure lines. The fog like mist is then produced and absorbed into the plants atmosphere. When the desired humidity level is reached, the system automatically shuts off.

Humidification needs are as varied as the manufacturing facilities themselves. All systems are individually engineered and designed by experienced engineers and product managers. A survey of heat loads, square and cubic footage, the manufacturing process, etc., determines the customer's individual humidification needs. The system is designed and manufactured to accurately meet the determined requirements.

Field trained technicians will install the systems and familiarize the customer's personnel with the various aspects and components. Our installation supervisors are available to provide assistance for customer-installed system. Field service technicians and in-house staff continue the after-sale support.

Pump Skid

High pressure pump, electric motor, and numerous safety switches. Low pressure inlet safety switch, high pressure outlet safety switch, thermal release valve, and a pressure bypass.

Control Panel

Digital controller maintains ambient RH to within ±2% of set point based on inputs from the humidity sensor.

Humidity Sensor

Rugged, yet extremely accurate. Humidistat senses humidity with a ±2% accuracy

Nozzle Lines

All nozzles lines and supply lines are made completely of Stainless Steel tubing and fittings.


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Motorized Ball Valve

Upon receiving signal from the control panel this valve will open to turn on the system or close to turn it off. There is a 4 second period so the system is not shocked with 1000psi all at once. When it closes it also relieves the pressure in the lines to be sent to the drain.

Final Filter

Final incoming water filter has 5 micron absolute elements.

AMCO manufactures direct spray high-pressure humidification systems designed to keep wood at its EMC for wood product manufacturers.

Recommended Relative Humidity Levels

Application Moisture Content
Most areas of United States Dry Southwestern area Damp, warm coastal areas
Wood Products Average EMC R.H. Average EMC R.H. Average EMC R.H.
Interior: Woodwork, flooring, furniture, wood trim, laminated timbers, cold-press, plywood 6.5%-7% 35%-40% 6% 25%-30% 11% 45%-55%

Equilibrium Moisture Content (EMC)

The practical objective of all wood seasoning, handling, and storing methods should be to minimize moisture content changes in wood during service. The EMC is a moisture content at which the wood is neither gaining nor losing moisture. An EMC between 5% and 8% is recommended.

This is the percentage of moisture of its bone-dry weight. Wood is dimensionally stable when the moisture content is above the fiber saturation point. Wood dimensions change as it loses or gains moisture below that point. Since wood shrinks when losing moisture and swells when gaining moisture, this shrinking and swelling may result in warping, checking, splitting, or performance problems. The shrinkage of wood is affected by a number of variables. In general, the greater the density of the wood, the greater the shrinkage.

Benefits of Humidity Control

  • Maintains proper EMC, therefore eliminating stress and dimensional change which causes cracks, checking, warping, splitting, cupping, bowing, twisting and telegraphing. The defects from these stresses are usually unrepairable.
  • Machine quality is improved and tool life is increased by decreasing blow-out and constantly maintaining machining reference points.
  • Dowel and tenon alignment and fit remain constant and breakout is eliminated.
  • Dust fires and static explosions are almost eliminate..
  • Airborne dust is decreased by as much as 60%.
  • Evaporative cooling is provided.



AMCO direct spray high-pressure humidification systems control the plant's RH. Paper receives and loses moisture readily as the surrounding humidity changes. A moisture content of 5% to 7% provides suitable strength and workability. To achieve this moisture content, a RH of 40% to 50% must be maintained.

Recommended Relative Humidity Levels

Material Description Relative Humidity %
10 20 30 40 50 60 70 80 90
M.F. Newsprint Wood Pulp
(24% ash)
2.1 3.2 4.0 4.7 5.3 6.1 7.2 8.3 10.8
H.M.F. Writing Wood Pulp
(3% ash)
3.0 4.2 5.2 6.2 7.2 7.3 9.9 11.9 14.2
White Bond Rag (1% ash) 2.4 3.7 4.7 5.5 6.5 7.5 8.8 10.8 13.2
Comm, ledger 75% rag (1% ash) 3.2 4.2 5.0 5.6 6.2 6.9 8.1 10.3 13.9
Kraft Wrapping Coniferous 3.2 4.6 5.7 6.6 7.6 8.9 10.5 12.6 14.9

Benefits of Humidity Control

  • Eliminates static electricity and decreases or eliminates curl and warping.
  • Increases flexibility and dimensional stability through EMC.
  • Increases productivity with higher speeds and decreases rejects.
  • Improves sheet separation.
  • Enables better ink transfer and enhances ink and glue chemistry balance.
  • Aids in dust suppression and produces evaporative cooling.
  • Improves conditions of workplace and reduces heat load through evaporative cooling.



It is necessary to properly maintain both temperature and humidity control to produce high quality textiles with minimum down time and rejects. AMCO direct spray humidification systems are designed to meet the knitting machine manufacturers recommended 55% RH levels for best operations.

Recommended Relative Humidity Levels

Department Cotton % Man-made Fibers % Department Wool %
Opening and Picking 55-70 50-55 Raw Wool Storage 50-55
Carding 50-55 50-60 Mising and Blending 65-70
Silver Lapping 55-60 55-65 Carding - Worsted 60-70
Ribbon Lapping 55-60 55-65 Carding - Woolen 60-75
Combing 55-65 55-65 Combing - Worsted 65-75
Drawing 50-60 50-60 Drawing - Worsted
Roving 50-60 50-60 Bradford System 50-60
Spinning 35-60 50-65 French System 65-70
Winding and Spooling 55-65 60-65 Spinning-Bradford Worsted 50-55
Twisting 60-65 50-65 French (Mule) 75-85
Warping 55-70 50-65 Woolen (Mule) 65-75
Knitting 60-65 50-60 Winding & Spooling 55-60
Weaving 70-85 60-70 Warping - Worsted 50-55

Benefits of Humidity Control

  • Increases tensile strength of natural fibers and reduces waste.
  • Improves product quality and increases production.
  • Reduces static electricity and personal shock is eliminated.
  • Yarn is more controllable and fiber discharge and fly settle time is shortened.
  • Helps control cotton fly and lint and reduces yarn separation.



10402 Rodney Street
Pineville, NC, USA 28134

Phone: (704) 889-7281
Fax: (704) 8897270

Proudly manufactured in the USA for over 100 years.