Exair,Standard,Air,Knife

Standard Air Knife™


Hard hitting curtain of air for web, sheet and part blowoff.
What is the Standard Air Knife?

A quiet, energy efficient way to clean, dry or cool parts, webs or conveyors.

The Standard Air Knife utilizes the coanda effect (wall attachment of a high velocity fluid) to create air motion in its surroundings.

Using a small amount of compressed air as a power source, the Standard Air Knife pulls in large volumes of surrounding air to produce a high flow, high velocity curtain of air for blowoff.

A Model 2012 12" (30 cm) Standard Air Knife opens mustard packets prior to fill.

 

(3) Model 2012 12" (30cm) Standard Air Knives perform the drying cycle in this parts washer.
Why the Standard Air Knife?

Amplification ratios (entrained air to compressed air) of 30:1 are achieved with the Standard Air Knife, compared to 3:1 for drilled or slotted pipe. Air savings of 40% to 90% are possible when replacing these "homemade" blowoff devices. Pay-out is normally measured in weeks, not months or years.

The Standard Air Knife dramatically reduces "wind shear" by gradually introducing the entrained air to the ejected compressed air. Noise level is typically cut in half. The result is a high velocity, high volume sheet of air with reduced noise level and air consumption.

Applications   Advantages
Part drying after wash Up to 10 dBA noise reduction
Sheet cleaning in strip mills Reduced air consumption
Conveyor cleaning 30:1 air amplification
Part or component cooling Aluminum or stainless steel
Web drying or cleaning Variable force and flow
Environmental separation Stock lengths to 36" (91cm)
Bag opening/fill operations Unlimited system lengths
Pre-paint blowoff No moving parts
Scrap removal on converting operations Compact, rugged, easy to install
How the Standard Air Knife Works

Compressed air flows through the inlet (1) into a plenum chamber (2). It is then throttled through a thin nozzle (3) extending the length of the Standard Air Knife. This primary airstream adheres to the coanda profile (4), which turns it 90° and directs the flow down the face of the unit. The primary stream immediately begins to entrain surrounding air (5), for amplification ratios of 30:1 at 6" (15cm).

Standard Air Knife Specifications

The Standard Air Knife is available in seven standard lengths of 3", 6", 12", 18", 24", 30" and 36" (8, 15, 30, 46, 61, 76 and 91cm). Special lengths up to 36" (91cm) and unlimited system lengths are available. Any number of Standard Air Knives may be installed across a given area.

Filtration:
The use of clean air is essential. Kits include an automatic drain filter with a 5 micron filter element that is sized properly for flow.

Materials of Construction:
The Standard Air Knife is available in either aluminum or stainless steel construction.

Regulation:
A pressure regulator on the compressed air supply provides infinite control of flow, force, and air consumption. Kits include a pressure regulator that is sized properly for flow.

Shim Sets:
A Standard Air Knife has a .002" (.05mm) gap setting. This gap is set with a shim positioned between the cap and body of the Standard Air Knife. Force and flow through the Standard Air Knife may be easily increased by adding shims to open the gap. Kits include a shim set (three additional shims).
Kits include a Standard Air Knife, shim set, filter separator and pressure regulator.
A Model 2006 6" (15cm) Std. Air Knife blows powder loose from a belt so it can be vacuumed away.
Dimensions

Aluminum


Stainless Steel


Performance
Standard Air Knife Performance with .002" (.05mm) thick shim installed
Pressure
Supply		 Air Consumption
per Inch		 Velocity @ 6"
from target		 Sound level
@ 3'		 Force per Inch
@ 6" from target
PSIG Bar SCFM SLPM FPM M/S dBA Ounces Grams
20 1.4 1.3 37 4000 20.3 69 0.45 13
40 2.8 2.0 57 5800 29.5 78 1.1 31
60 4.1 2.7 76 8500 43.2 84 2.0 57
80 5.5 3.4 96 11,000 55.9 87 2.7 77
100 6.9 4.1 116 13,000 66 90 3.3 94
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Standard Air Knife





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Exair Standard Air Knife