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US 12,303,814 B2Granted
Filtration media
AssigneeMagnera Corporation
InventorsRalph A. Moody, III, Nyle Bishop, Mehmet Selcuk Sinangil, Robert Garcia, Rainer Nawroth, Victor Gnoatto, Elisabeth Torres Cano
Life of this patent
Estimating the term…
Abstract
A filtration media including at least a first nonwoven fabric having at least one meltblown layer in provided. The at least one meltblown layer includes a plurality of meltblown fibers having an average diameter from about 1 to about 5 microns. Methods of making a filtration media are also provided. Facemasks including such filtration media are also provided.
Claims32
A filtration media, comprising:
- a plurality of nonwoven fabrics including at least a first nonwoven fabric and a second nonwoven fabric each having a structure according to the any one of the following:
- S1a-M1b-S2c;
- and (Structure 1)
- S1a-M1b-S3a-M2e-S2c;
- (Structure 2)
- wherein,
- ‘M1’ comprises a first meltblown layer or a first group of multiple meltblown layers;
- ‘M2’ comprises a second meltblown layer or a second group of multiple meltblown layers;
- ‘S1’ comprises a first spunbond layer or a first group of multiple spunbond layers;
- ‘S2’ comprises a second spunbond layer or a second group of multiple spunbond layers;
- ‘S3’ comprises a third spunbond layer or a third group of multiple spunbond layers;
- ‘a’ represents the number of layers of ‘S1’ and is independently selected from 1, 2, 3, 4, and 5;
- ‘b’ represents the number of layers of ‘M1’ and is independently selected from 1, 2, 3, 4, and 5;
- ‘c’ represents the number of layers of ‘S2’ and is independently selected from 1, 2, 3, 4, and 5;
- ‘d’ represents the number of layers of ‘S3’ and is independently selected from 1, 2, 3, 4, and 5;
- and
- ‘e’ represents the number of layers of ‘M2’ and is independently selected from 1, 2, 3, 4, and 5;
- wherein the first nonwoven fabric and the second nonwoven fabric each includes at least one meltblown layer (M1) including a plurality of meltblown fibers comprising a polyolefin, and wherein the plurality of meltblown fibers have an average diameter from about 1 to about 5 microns;
- wherein the filtration media has a Filtration Media Efficiency Factor (FMEF) of at least about 0.025;
- wherein FMEF is determined according to Equation (1):
- FMEF=(A/B)/C Equation (1):
- wherein
- A is the % filtration efficiency of the filtration media determined by TSI 8130 instrument at 85 LPM 2% NaCl solution, (particle size avg 0.3 micron);
- B is the pressure drop across the filtration media in Pa/cm2 according to EN14683/F2100-19;
- and
- C is the basis weight of the filtration media in gsm.
23 more elements
A filtration media, comprising:
- a plurality of nonwoven fabrics including at least a first nonwoven fabric and a second nonwoven fabric each having a structure according to the any one of the following:
- S1a-M1b-S2c;
- and (Structure 1)
- S1a-M1b-S3d-M2e-S2c;
- (Structure 2)
- wherein,
- ‘M1’ comprises a first meltblown layer or a first group of multiple meltblown layers;
- ‘M2’ comprises a second meltblown layer or a second group of multiple meltblown layers;
- ‘S1’ comprises a first spunbond layer or a first group of multiple spunbond layers;
- ‘S2’ comprises a second spunbond layer or a second group of multiple spunbond layers;
- ‘S3’ comprises a third spunbond layer or a third group of multiple spunbond layers;
- ‘a’ represents the number of layers of ‘S1’ and is independently selected from 1, 2, 3, 4, and 5;
- ‘b’ represents the number of layers of ‘M1’ and is independently selected from 1, 2, 3, 4, and 5;
- ‘c’ represents the number of layers of ‘S2’ and is independently selected from 1, 2, 3, 4, and 5;
- ‘d’ represents the number of layers of ‘S3’ and is independently selected from 1, 2, 3, 4, and 5;
- and
- ‘e’ represents the number of layers of ‘M2’ and is independently selected from 1, 2, 3, 4, and 5;
- wherein the first nonwoven fabric and the second nonwoven fabric each includes at least one meltblown layer (M1) including a plurality of meltblown fibers comprising a polyolefin, and wherein the plurality of meltblown fibers have an average diameter from about 1 to about 5 microns;
- wherein the filtration media has a Meltblown Filtration Efficiency Factor (MFEF) of at least about 0.1;
- wherein MFEF is determined according to Equation (2):
- FMFEF=(A/B)/D Equation (2):
- wherein
- A is the % filtration efficiency of the filtration media determined by TSI 8130 instrument at 85 LPM 2% NaCl solution, (particle size avg 0.3 micron);
- B is the pressure drop across the filtration media in Pa/cm2 according to EN14683/F2100-19;
- and
- D is the total basis weight of the meltblown layers in the filtration media in gsm.
23 more elements
Dependencies are inferred from the claim text.