DESIGN NEWS REPORT OPEN-PORE POLYURETHANE FOAM AND FELT
November 25, 1964
[DESIGN NEWS REPORT pamphlet page 2]
TEST RESULTS (Air Filter Institute) show open-pore polyurethane foam well-suited for air filter applications. Filters have received widespread acceptance in heating and air-conditioning fields and are gaining increasing acceptance as carburetor filters for automotive and small engines.
[following describes pictures on page 3]
1 CARBURETOR AIR CLEANER made of open-pore foam is designed to be washable. Filter element has self-sealing lips and at top and bottom.
2 CENTRIFUGAL OIL-MIST COLLECTOR employs open-pore foam filter to condense or remove oil droplets from air stream. Air containing oil vapor or mist is drawn by centrifugal impeller from vicinity of grinding machines, impinged against internal baffle and then swirled through foam filter. Units are designed by Dustrol Div., Robbins & Myers, Inc., Springfield, Ohio, and employ zippers to allow easy removal for cleaning in common detergent.
3 HIGH-EFFICIENCY FILTER for gas-fired furnaces and central air-conditioning system uses pleated construction to double foam surface area. Pleating is achieved by curving open-pore sheets back and forth around light wire rods fixed to frame. Filter is designed to be permanent and may be washed, hosed or vacuumed without damage.
4 AEROSOL UPHOLSTERY SHAMPOO DEVICE uses coarse open-pore foam to hold and diffuse shampoo and to provide scrubbing action. Brush applicator is reusable.
5 HUMIDIFIER uses band of coarse, open-pore foam to carry water droplets from supply pan to heated air stream. Material is easy to fabricate and is stretched over vapor-wheel frame.
6 MICROPHONE COVERS of fine-pore foam (60 ppi or more) are used to screen out extraneous background sound and noise generated by breath or wind. Other acoustic applications include use as sound-absorption material within enclosures.
7 FILTERS OF OPEN-PORE FOAM protect sensitive memory-unit components of IBM data-processing systems from airborne contaminants. Filter pads are epoxy-bonded to aluminum screen, can be removed for cleaning by washing or vacuuming. Material is used dry and does not require oil impregnation. It also contains no metallic particles that might interfere with equipment operation.