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Donaldson Company, Inc.
The Dryflo mist collector, Models MMA and MMB, mount directly to a machining center to collect airborne mist such as oil, water-
soluble, and synthetic coolant from machining operations. Three stages of filtration, plus an optional HEPA filter, provide a cleaner,
healthier work environment as well as a more cost effective means of mist collection. With airflow capacities from 390 to 800 cfm,
the Dryflo is a strategic component to meeting industrial and government air-quality standards. The high efficiency filter cartridges
allow air and coolants to be recycled and the cartridge efficiency actually increases as the collector operates.
Designed to increase the versatility of the collector, standard options include inlet hoppers, impact separators, drain collection
methods and an adjustable stand. A variety of filter media specifically designed for mist collection, from heavy liquid-load to heavy
particulate-load applications, is also available.
Intended Use
Airborne mist is small droplets of liquid suspended in the air. Dryflo mist collectors are widely used in machine tool operations
using metalworking fluids. Metalworking fluids include straight oil, water-soluble coolants, soluble oil, and semi-synthetic coolants.
These fluids perform a variety of functions such as lubricating or cooling the part or the tool, flushing chips away from the part, and
suppressing dust and smoke. Oils and coolants allow machines to operate faster and tools to last longer resulting in high quality
parts.
Mist is created two ways: mechanical action or thermal effects. Mechanical action refers to aerosol used for light lubrication and
generally creates mist greater than one micron in size. Thermal effects occur when heat vaporizes the coolant; the vapor cools and
recondenses into a mist. Thermal effects create mist from 0.01 to 1 micron in size. Other contaminants, such as dust from the part
or the tool or smoke from the combustion of the oil or coolant are also generated when using metalworking fluids.
The Dryflo can collect some dust with the mist; however, it should not be operated without mist. The collector is not designed to
handle water mist alone as water vapor will pass through the filters. The extremes of very heavy oil and light, thin oil should be
avoided. Very heavy oil, similar to tar consistency, will not drain while very light, thin oil, may evaporate.
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Product Description
Standard Equipment
Machine Mount
The air inlet also serves the collector as a drain, collected mist droplets drain back into the machine center. Machine mounting, or
collection at the source is the most efficient means of mist collection.
Inlet Gasket
Used on machine centers that have a large, flat unobstructed top surface.
Integral Housed Fan
The integrated fan assembly provides airflow for the collector.
Minihelic
®
Gauge
The Minihelic is a differential pressure gauge used to measure the pressure difference between the clean- and dirty-air plenums
and provides a visual display of filter change requirements.
Exhaust Pack
The exhaust pack provides an exit for clean air with additional HEPA and DOP filter options.
