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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.

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-back 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.

Drilled pipe or open jets, by contrast, provide minimal air amplification. They also produce unacceptably high noise levels as the compressed air shears into the still air.

How the Standard Air Knife Works

Compressed air flows through the inlet (1) into a plenum chamber. It is then throttled through a thin nozzle (2) extending the length of the Standard Air Knife. This primary airstream adheres to the Coanda profile (3), which turns it 90° and directs the flow down the face of the unit. The primary stream immediately begins to entrain surrounding air (4), for an amplification ratio of 30:1 at 152mm (6″) away.

Performance

Pressure Supply Air Consumption per Inch (25mm) Velocity at 6″ (152mm) from target Sound Level @ 3′ (914mm) Force per Inch (25mm) @ 6″ (152mm) from target
PSIG BAR SCFM SLPM FPM M/S dBA OUNCES GRAMS
20 1.4 1.3 37 4,000 20.3 65 0.45 13
40 2.8 2 57 5,800 29.5 74 1.1 31
60 4.1 2.7 76 8,500 43.2 80 2.0 57
80 5.5 3.4 96 11,000 55.9 83 2.7 77
100 6.9 4.1 116 13,000 66.0 86 3.3 94

Note: Performance on lengths over 36″ will
vary. Contact an Application Engineer for details.

12″ (305mm) Standard Air Knife tested with .002″ (0.05mm) thick shim
installed.

Changing Performance by Adding Shims

The compressed air exhausts through a gap that is set with a shim positioned between the cap and the body of the Standard Air Knife. For most applications, the .002” (0.05mm) thick shim installed in the Standard Air Knife when it is shipped works best. There are, however, some situations that require more force and flow. Thicker shims will increase the gap opening offering higher velocity and harder hitting force. Air consumption and noise will be slightly higher.

Shim sets for Aluminium Standard Air Knives include .001” (0.03mm), .003” (0.08mm) and .004” (0.10mm) thick plastic shims.
Shim sets for Stainless Steel Standard Air Knives include (3) .002″ (0.05mm) thick stainless steel shims.

Applications

  • Part drying after wash
  • Sheet cleaning in strip mills
  • Conveyor cleaning
  • Part or component cooling
  • Web drying or cleaning
  • Environmental separation
  • Bag opening/fill operations
  • Scrap removal on converting operations

Advantages

  • Up to 10 dBA noise reduction
  • Reduced air consumption
  • 30:1 air amplification
  • Aluminium or stainless steel
  • Stock lengths to 48″ (1219mm)
  • No moving parts
  • Compact, rugged, easy to install
  • Compressed air inlets on each end
  • Variable force and flow

(3) Model 2012 12" (305mm) Standard Air Knives perform the drying cycle in this parts washer.

A Model 2006 6” (152mm) Standard Air Knife blows powder loose from a belt so it can be vacuumed away.

A Model 2012 12" (305mm) Standard Air Knife opens mustard packets prior to fill.

Application Spotlights

Blowoff On A Transmission Pan

The Problem

A newly designed transmission pan presented a myriad of cleaning problems for the die-caster. Because the configuration included channels and blind holes as well as smooth surfaces, a “shaped” air pattern was required for proper cle...

Learn More

Airflow Pattern

Dimensions

Aluminium Standard Air Knife

Type 303 Stainless Steel Standard Air Knife

Models

Standard Air Knife Models
Standard Air Knife Only
Standard Air Knife Kits
Kits include a Standard Air Knife, shim set, filter separator and pressure regulator (with coupler).
Deluxe Standard Air Knife Kits Deluxe Kits include a Standard Air Knife, EFC, Universal Mounting System, shim set, filter separator and pressure regulator (with coupler).
Standard Air Knife Shim Sets A .002″ (0.05mm) thick shim comes installed in the Standard Air Knife. Shim Sets for Aluminium Standard Air Knives include a .001″ (0.03mm), a .003″ (0.08mm), and a .004″ (0.10mm) thick plastic shim. Shim Sets for Stainless Steel Standard Air Knives include (3) .002″ (0.05mm) thick stainless steel shims.
Aluminium Standard Air Knife
Airflow Length Standard Air Knife Only Model Standard Air Knife Kit Model Deluxe Standard Air Knife Kits Model Standard Air Knife Shim Set Model
3″ (76mm) BP2003 BP2203 BP2203DX 2303
6″ (152mm) BP2006 BP2206 BP2206DX 2306
9″ (229mm) BP2009 BP2209 BP2209DX 2309
12″ (305mm) BP2012 BP2212 BP2212DX 2312
18″ (457mm) BP2018 BP2218 BP2218DX 2318
24″ (610mm) BP2024 BP2224 BP2224DX 2324
30″ (762mm) BP2030 BP2230 BP2230DX 2330
36″ (914mm) BP2036 BP2236 BP2236DX 2336
42″ (1067mm) BP2042 BP2242 BP2242DX 2342
48″ (1219mm) BP2048 BP2248 BP2248DX 2348
Type 303 Stainless Steel Standard Air Knife
Airflow Length Standard Air Knife Only Model Standard Air Knife Kit Model Deluxe Standard Air Knife Kits Model Standard Air Knife Shim Set Model
3″ (76mm) BP2003SS BP2203SS BP2203SSDX 2303SS
6″ (152mm) BP2006SS BP2206SS BP2206SSDX 2306SS
9″ (229mm) BP2009SS BP2209SS BP2209SSDX 2309SS
12″ (305mm) BP2012SS BP2212SS BP2212SSDX 2312SS
18″ (457mm) BP2018SS BP2218SS BP2218SSDX 2318SS
24″ (610mm) BP2024SS BP2224SS BP2224SSDX 2324SS
30″ (762mm) BP2030SS BP2230SS BP2230SSDX 2330SS
36″ (914mm) BP2036SS BP2236SS BP2236SSDX 2336SS
42″ (1067mm) BP2042SS BP2242SS BP2242SSDX 2342SS
48″ (1219mm) BP2048SS BP2248SS BP2248SSDX 2348SS

Accessories

Universal Air Knife Mounting System
Provide precise positioning for your air knife

The Model 9060 Universal Air Knife Mounting System is used to provide secure, precise positioning for any of the EXAIR Air Knives. The Air Knife can quickly and easily be moved within close proximity of the part to improve effectiveness.

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EFC Electronic Flow Control
Turn off the compressed air when it isn’t needed

EXAIR’s EFC™ is a user-friendly electronic flow control for compressed air that is designed to minimise compressed air use on blowoff, drying, cooling, conveying and static elimination operations. The EFC combines a photoelectric sensor with a timing control that limits compressed air use by turning it off when no part is present. The timing control permits easy tuning to the application requirements while providing flexibility in sensing distance.

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Filters, Regulators, Valves & More

With proper filtration of dirt, moisture and oil from the compressed air supply, EXAIR compressed air products will operate for years with no maintenance required. Use a 5 micron or smaller filter separator on the compressed air supply. To prevent problems associated with oil, use a 0.03 micron or smaller oil removal filter on the compressed air supply.  Pressure regulators permit easy selection of the operating pressure, providing infinite control of flow, force and air consumption.

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Installation and Maintenance Sheets

pdf
Standard and Full-Flow Air Knife

349.50 KB

pdf
Air Knife Shim Set

109.65 KB

pdf
Universal Air Knife Mounting System

439.57 KB

Air Knives PDF Brochure

CAD Drawings

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