CARTRIDGE AIR FILTER DRY CLEANING MACHINE
The Zaiser machine will clean filters with a maximum length of 36", and a maximum diameter of 18", without having to make any mechanical changes to the machine. Competitive units require that extensions be added to the compressed air nozzles for both the larger height and larger diameter filters. The extension for the longer filters also sacrifices some of the cleaning efficiency by having less than complete coverage by both nozzles over the full length of the filter.
The Zaiser machine cleans the filters in a horizontal position, allowing gravity to work to our benefit in removing the larger particles of dirt from the pleated filter media. We have found that this is particularly important in the cleaning of filters with an inside-out airflow, those that we call "Inside Dirty". Some competitive units clean the filter with it mounted vertically in the machine.
The Zaiser machine uses air nozzles located both inside and outside of the filter, as do other units; but because our nozzles all point in a downward direction, they can be operated simultaneously, resulting in faster and more efficient cleaning. In competitive units the nozzles oppose each other, and therefore must be alternated during the cleaning process.
The Zaiser machine uses patented pneumatic hammers both inside and outside of the filter that agitate the filter to assist in loosening and removing larger particles of dirt. These hammers operate continuously during the cleaning cycle to aid in the cleaning. One competitive unit uses a fast spin and bounce on the filter at the beginning of their cleaning cycle to try and accomplish the same loosening process, but this lasts for only about 15 seconds out of a 5-minute cycle time.
The Zaiser machine uses a series of dampers to always direct the exhaust air through the filter media in the reverse direction from which the filter was used. By comparison, there is a competitive unit that has three exhaust points that operate constantly. With one located inside and two outside the filter, at least one is always trying to pull the dirt back onto the filter surface.
The Zaiser machine is programmed to count the number of times the nozzles and hammers travel across the length of the filter during the cleaning cycle. This assures that all filters, regardless of length, receive the same amount of cleaning. Competitive units use a fixed timer for the cleaning cycle. This gives a lot more cleaning to a shorter filter, and much less to a longer filter; with the only alternative being to run the longer filters for a second cycle.
The Zaiser machine incorporates a timed hold for the nozzles at each end of the filter in order to give extra attention to the end cap areas where we have found dirt tends to get trapped. This equalizes the cleaning along the full length of the filter. There is no competitive unit that addresses this particular problem.
The Zaiser machine has a 3- Position selector switch that allows the operator to adjust the cleaning cycle to accommodate "Very Clean", "Normal", or "Very Dirty" filters. After a short time of cleaning filters, an operator gets to know how dirty a filter actually is as they handle the filter to put it into the machine for cleaning. By adjusting the cleaning cycle accordingly, they can optimize the cleaning time required for each filter; and increase productivity. No competitive unit offers this feature.
The Zaiser machine uses a standard, "Off-the-Shelf", gearmotor with a direct gear drive for both the turntable and the nozzle carriage. This results in a simple, maintenance free design. Competitive units can use special variable speed DC motors, and high maintenance chain drives for some of their moving components.
The Zaiser machine uses a machined turntable with a hardened steel support ring mounted on concentric guide bearings for rotation of the filter. One competitive unit just uses two heavy blocks of steel sliding on top of each other, with a grease fitting for lubrication.