FIELD: filtering materials for liquid and gaseous fluids.
SUBSTANCE: filtering material is made of thermoplastic polymeric fibers. The density of material increases downstream, whereas the diameter of fibers decreases downstream. The inner layer of the material has areas the density of fibers in which is lower than the averaged density of upper layers by a factor of 2-6.
EFFECT: enhanced strength.
1 dwg, 1 tbl
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|---|---|---|---|
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|
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|
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|
RU2706307C1 |
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|
RU2280491C2 |
