Super Air Wipe Vs. Block Type Air Wipe

When you need to cool, blow off or dry extruded objects there are several options available, however only the EXAIR Super Air Wipe delivers the performance, efficiency and versatility that most applications require!  In today’s blog we will contrast some of the differences between the EXAIR Super Air Wipe and block type air wipes.

The split-ring design of EXAIR’s Super Air Wipe offers easy clamping around the surface of the material moving through it and eliminates the need for time-consuming, cumbersome threading.  While Block Type Air Wipes are also of split design the diameter of the material drawn through it can typically only vary by approximately 1/16″!  In contrast the EXAIR Super Air Wipe is effective on materials that can range in size from approximately half the throat diameter up to within a fraction of an inch on the internal diameter.  This range can be as large as five to six inches in our largest Super Air Wipes.  The key is to ensure the material does not contact the Super Air Wipe.

Mounting the EXAIR Super Air Wipe is a snap, it can be accomplished by using either the 1/4 – 20 tapped holes on the downstream side or by utilizing a hard pipe compressed air supply line.  The access to these bolt holes makes it easy to change out in the event the production line runs several different sizes. If needed the included stainless steel 1/4-20 bolts can also be removed and longer bolts could be installed to mount from either side.

Connecting the EXAIR Super Air Wipe to your compressed air supply is straightforward.  For sizes up for 4″ throat diameter a stainless steel braided connecting hose is supplied pre-installed from the factory and a single 1/4″ FNPT inlet is used to supply the entire wipe.  For the 5″ up to 7″ throat diameter there is a single 1/4″ FNPT inlet on each half of the wipe which would need to be connected with compressed air.  Lastly, the 9″ and 11″ sizes from stock each have two 1/4″ FNPT inlet on each half of the wipe which would need to be connected to provide the appropriate flow for optimal performance.

split design1
EXAIR Super Air Wipe features hinged design for trouble-free threading

Another very important consideration is the temperature of the material you are running.  EXAIR Aluminum Super Air Wipes are rated for temperatures up to 400°F (204°C) with the Stainless Steel models rated up to 800°F (427°C).    Typically, block air wipes are made from delrin or polypropylene with a replaceable wear liner,  unfortunately these materials do not tolerate higher temperatures like the EXAIR Super Air Wipes.

Super Air Wipe extrusion save
EXAIR Super Air Wipe cooling an extrusion, high temperatures are not a problem!

To explain how the EXAIR Super Air Wipes work, reference the animation below: Compressed air flows through the inlet (1) of the Air Wipe into the annular chamber (2).  It is then throttled through a small ring nozzle (3) at high velocity.  This primary air stream adheres to the Coanda profile (4), which directs down the angled surface of the Air Wipe.  A low pressure is created at the center (5) inducing a high volume flow of surrounding air into the primary airstream.  As the airflow exits the slot, it creates a conical 360° ring of air that will attach to the surface of the material running through it (6) uniformly wiping the entire surface with the high velocity airflow.

sawworksani
How The Super Air Wipe Works

While block style air wipes have a  fixed performance because they operate off a series of non-adjustable drilled holes, the EXAIR Super Air Wipe operates off an adjustable shim design.  As shown in the figure above the shim sets the gap opening of the ring nozzle (3).  The stock thickness of the stainless steel shim is .002″ (.05mm), shims can be stacked to provide a coarse adjustment in volumetric air flow.  Custom shim thicknesses are also available to tailor the performance to your needs.   The shim thickness coupled with a pressure regulator gives the Super Air Wipes adjustability from a gentle breeze to remove light debris or provide cooling all the way up to a forceful blast to remove more viscous fluids or provide quick cooling.

The EXAIR Super Air Wipe is 1.13″ (29mm) thick on all (11) Aluminum models that range in size from 3/8″ (10mm) to 11″ (279mm) throat diameter and all (5) Stainless Steel models that range in size from 1/2″ (50mm) to 4″ (102mm).

Super Air Wipe Family Photo

The Aluminum Super Air Wipe is available in 11 sizes 3/8″, 1/2″, 1″, 2″, 3″, 4″, 5″, 6″, 7″, 9″ & 11″; the Stainless Steel Super Air Wipe comes in 5 sizes, 1/2″, 1″, 2″, 3″ & 4″…all from stock!

So when you need to cool, blow off or dry extruded material or need expert advice on safe, quiet and efficient point of use compressed air products, give us a call.  We would enjoy hearing from you!

Steve Harrison
Application Engineer
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Super Air Wipe Vs. Block Type Air Wipe

Air Wipes, which provide 360 degree blowoff, are typically used to remove heat, liquid, debris or static from wire, cable, pipe, tube, or extrusions.

We had a customer that was using a block type Air Wipe from a competitor to remove water from an extrusion.  These air wipes are built using a plastic material, typically with some additional ceramic insert to resist abrasion of the wire, the halves are hinged with air holes drilled into each half which carries air through the block and on to the wire. They were using these block air wipes on several lines. The interesting point of this blog is that it required 5 block type air wipes to equal the results of 1 EXAIR Super Air Wipe.

Since EXAIR’s Super Air Wipe equaled the performance of 5 of the competitors it consumed less air was less expensive and produced less noise.  Also in space sensitive applications the EXAIR Super Air Wipe is much thinner than the block type.  To highlight this the Super Air Wipe is 1.13″ thick on all 11 models that range from 3/8″ to 11″ throat diameter.   The performance of the block air wipe can only be changed by altering the inlet air pressure while the EXAIR Super Air Wipe can also be changed by adusting the inlet air pressure OR by adding an additional shim the force can be nearly doubled!

Many of these block type air wipes use a series of holes to direct the compressed air supply at an angle over the material that needs to be cleaned off.  EXAIR’s Super Air Wipe being an engineered compressed air product use’s fluid dynamic’s to create more force as demonstrated below. The air from EXAIR’s Super Air Wipes is a continuous 360 degrees, without the gaps a series of holes creates.

sawworksani
How The Air Wipe Works

Compressed air flows through the inlet (1) of the Air Wipe into the annular chamber (2).  It is then throttled through a small ring nozzle (3) at high velocity.  This primary airstream adheres to the Coanda profile (4), which directs down the angled surface of the Air Wipe.  A low pressure is created at the center (5) inducing a high volume flow of surrounding air into the primary airstream.  As the airflow leaves the wipe, it creates a conical 360° ring of air that attaches itself to the surface of the material running through it (6) uniformly wiping the entire surface with the high velocity airflow.

Block type air wipes are generally available in standard sizes up to 7″ in diameter while EXAIR’s Super Air Wipes are available in stock diameters up to 11″ and we also offer custom sizes to suit many other applications.

If you have any items that need to have a 360 degree blowing pattern, I would enjoy hearing from you…give me a call.

Steve Harrison
Application Engineer
Send me an email
Find us on the Web 
Follow me on Twitter
Like us on Facebook

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