FIELD: polymer materials and gas treatment.
SUBSTANCE: invention relates to polymeric fibrous filter materials designed for effective cleaning of air stream due to realization of mechanical and electrostatic filtration. Material suitable for use in respiratory masks contains (i) a layer in the form of cloth 1 mm thick made from polypropylene fibers with diameter 0.5-1.5 μm, packaging density 0.25-0.30 g/cm3, and electric charge with surface density 17-21 nCl/cm2, the layer being made by aerodynamic atomization of melt and electrization of fibers in corona discharge field during their formation, and (ii) an additional layer in the form of non-electrized cloth 1 mm thick made from polypropylene fibers with diameter 10-20 μm and packaging density 0.25-0.30 g/cm3, which is placed on the side directly facing air stream to be cleaned, the two layers being attached to each other by spot weld. Presence of two layers results in separate but complementary realization of mechanical and electrostatic filtration.
EFFECT: enhanced air cleaning efficiency and prolonged lifetime of filter material.
1 tbl
Title | Year | Author | Number |
---|---|---|---|
METHOD OF PRODUCING ELECTRET FINE FIBROUS FILTER MEDIUM FOR RESPIRATORS | 2001 |
|
RU2198718C1 |
METHOD OF ELECTRIZATION OF NONWOVEN CLOTH, ELECTRET FILTER MEDIUM, FLEXIBLE FILTERING MASK AND BREATHING MASK ASSEMBLY | 1994 |
|
RU2130521C1 |
FILTER FOR CIGARETTES | 2003 |
|
RU2235488C1 |
ELECTRET ARTICLES AND FILTERS RESISTANT TO OIL MIST | 1998 |
|
RU2199372C2 |
METHOD OF PRODUCTION OF ELECTRET ITEMS AND FILTERS WITH HEIGHTENED RESISTANCE TO THE OIL MIST | 1998 |
|
RU2246979C2 |
METHOD FOR MANUFACTURE OF FIBROUS ELECTRET WEB WITH THE USE OF NON-AQUEOUS POLAR LIQUID | 2000 |
|
RU2247182C2 |
METHOD AND A DEVICE FOR MANUFACTURE OF A FIBROUS ELECTRET LINEN WITH APPLICATION OF A WETTING LIQUID AND A WATER POLAR LIQUID | 2000 |
|
RU2266771C2 |
ELECTRET ARTICLE HAVING HIGH FLUOROSATURATION RATIO | 2006 |
|
RU2362626C1 |
ELECTRET ARTICLE WITH HETEROATOMS AND LOW SATURATION WITH FLUORINE | 2006 |
|
RU2363518C1 |
ELECTRETIC FABRICS WITH ADDITIVES PROMOTING FABRIC CHARGING | 2010 |
|
RU2477344C1 |
Authors
Dates
2005-10-20—Published
2004-09-14—Filed