Being in Ohio, I have gone by many farmlands with rolls of black polyethylene tubes in the fields. They use these tubes to place in the ground to create proper drainage in the fields. A manufacturer of these agricultural drain pipes sent me a video of their operation. After the pipe was extruded, they would run it through a wash system to cool the pipe. After the wash system, they needed to remove the water from a 4” (102mm) diameter pipe at a speed of 70 feet per minute (21 meters per minute). They designed a home-made device that used a blower-system to blow the water off the pipe (reference photo below). Since the pipe had ribs and the blower system is at a much lower force, the removal rate of water was only around 75%. They needed a way to get the pipe dryer before packaging.
This company made plastic pipe ranging from 4” (102mm) to 10” (254mm) in diameter. When they searched for pipe and tube blow-off devices, they came across the Standard Air Wipes from EXAIR. The design of the Standard Air Wipe blows compressed air at a 30-degree angle toward the center in a 360-degree air pattern, just like a cone. It uses a Coanda profile to maximize the entrainment of ambient air into the compressed air stream to produce a strong force. As a non-contact wiping device; the Standard Air Wipe is very efficient and very powerful.
For this application, I recommended the model 2485 5” Standard Air Wipe Kit. This kit includes our Standard Air Wipe, a Filter Separator, a Regulator, and a Shim Set. With a ½” or 13mm clearance, it gave ample room to allow the 4” (102mm) pipe to travel through without touching and to allow for ambient air entrainment. The Filter Separator will remove bulk liquids and debris from the compressed air to keep the unit performing optimally and to keep the pipe from getting dirty. The Regulator is used to control the amount of force. This helps to not over-use the amount of compressed air required for the cleaning. With a Regulator, you can make fine adjustments to get the proper amount of air while the shims in the Shim Set will give you coarse adjustments. With the Regulator and Shim Set together, you can “dial” in the correct amount of force required for the different speeds. The Standard Air Wipe Kits will give you the most versatility in your system to optimize the 360-degree blow-off.
As they removed their home-made unit and attached the Super Air Wipe, they noticed some great things. The speed of production was increased by about 10% which matched the maximum speed of the machine. The water removal from the surface was near 100% even in the rib area. (Some acceptable “overlaps” in the extrusion process was cleared by QC). They also noticed that the Standard Air Wipe was much quieter; near 82 dBA at 80 PSIG (5.5 bar). The nearby operators were very happy with this choice as the blower-type system was very loud. And, with no moving parts, the Air Wipe was able to remove the maintenance requirements for the blower system and used a much smaller footprint. Also, we use a split design to mount the Standard Air Wipe around the outside of the pipe without cutting into the extruded lengths.
With the creation of the EXAIR Standard Air Wipes; uniform cleaning, cooling, and blowing around the outside of parts is a simple task. You don’t have to worry about many nozzles to target the circumference, or a fabricated blow-off device that will waste time and money. At EXAIR, we offer a 30-day unconditional guarantee for U.S. and Canadian customers. This customer used the 30-day trial to try the Standard Air Wipe. After the testing, they will now purchase the model 2491 11” Standard Air Wipe Kit for their largest pipe. You can order them from our website at www.EXAIR.com or call us at 800-903-9247. If you need help in selecting the proper size for your application, you can contact an Application Engineer at EXAIR for help.