An OEM of crate washing equipment in Lebanon recently contacted me about an application on one of their conveyors. The conveyor carries a plastic crate out of a washer and excess water on the crate was presenting a problem in the application. In order for the crate to move on to the next step in the machine, a blow off solution was needed, but the exit rate from the washer was inconsistent. In a given minute there could be 5 crates exit the washer, or there could be 20. So, the ideal solution needed to have intermittent control options with instantaneous on/off functionality.
We immediately began discussing Super Air Knives, not only because we show plastic crate blow off in one of our many videos, but also because these units are instant on/off with full compatibility with a flow control device. Utilizing a flow controller, such as the EXAIR Electronic Flow Controller or PLC device, will allow for precise control of the blow off solution, limiting compressed air use to a minimum.
After discussing application details we came to the design shown above, using one 24” Air Knife on the top of the crate and two 9” Air Knives on the sides. However, this OEM had purchased numerous 2” Flat Stainless Steel Super Air Nozzles in the past (model 1122SS) and had a number available on site. Modifying the system to utilize the nozzles already on-site, we came to this design:
This layout utilizes (1) 24” Stainless Steel Super Air Knife on the top of the crate and (2) sets of (3) 2” Flat Stainless Steel Super Air Nozzles on the sides, held in place with EXAIR Stay Set Hoses. Notice the independent pressure regulators for the nozzles and the knife. This is to allow the customer to balance the air flows, because the 2” flat nozzles will create a higher force than the Air Knife when operating at the same pressure.
In this application we were able to help a returning OEM solve their problem with the right mix of needed products. Exploring the problem and discussing numerous viable solutions led to the best fit for the application and customer. That’s precisely why EXAIR Application Engineers are available for any application call or question. If you’d like to explore an EXAIR solution we’ll be happy to help.