FABRIC
FILTER NEWSLETTER
January 2010
No. 411
Donaldson has patented an alloy (polysulfone and a poly (N-vinyl lactam)
material, nanofiber and microfiber. The material offers improved resistance to:
heat, humidity, aqueous liquids, solvent streams, high flow rates, high particle
loads, reverse pulse cleaning, operational abrasion, submicron particulates.
Advantageous features when used in gas filtration applications include: higher
efficiency, lower flow restriction, high durability (stress related or
environmentally related) in the presence of abrasive particulates and a smooth
outer surface free of loose fibers or fibrils. The overall structure of the
filter materials provides an overall thinner media allowing improved media area
per unit volume, reduced velocity through the media, improved media efficiency
and reduced flow restrictions.
An additive can be used with the alloy to produce a fiber with a surface coating
of additive on the microfiber with oleophobicity, hydrophobicity or other
favorable characteristics for high temperature, high humidity and difficult
operating conditions. The blending of the polysulfone and poly (N-vinyl lactam)
polymers is used to tailor existing commercial polymers to specific end use
requirements. Polysulfones are rigid and tough, exhibit excellent inherent
burning resistance characteristics and excellent electrical insulative
capabilities.
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