Source: https://patents.google.com/patent/US6488731B2/en
Timestamp: 2018-08-21 05:19:06
Document Index: 189887989

Matched Legal Cases: ['§ 5', '§ 5', '§ 5', 'art 1', '§ 5', '§ 5']

US6488731B2 - Pleated filter made of a multi-layer filter medium - Google Patents
Pleated filter made of a multi-layer filter medium Download PDF
US6488731B2
US6488731B2 US09810584 US81058401A US6488731B2 US 6488731 B2 US6488731 B2 US 6488731B2 US 09810584 US09810584 US 09810584 US 81058401 A US81058401 A US 81058401A US 6488731 B2 US6488731 B2 US 6488731B2
US09810584
US20020011051A1 (en )
Wolfram Schultheiss
Jörg Stöckler
The present invention relates to a pleated filter made of a multi-layer filter medium, including at least one filter paper layer having area weights of 30-100 g/m2, a microfiber nonwoven fabric layer having area weights 5-120 g/m2 and a support nonwoven fabric layer made of synthetic, polymeric fibers having area weights of 10-120 g/m2. The layers of the pleated filter contain fused polymer areas by which the fabric layers are bonded to the paper layer, and by which the fabric layers are made firmer within themselves. When subject to a fractional efficiency test at an initial pressure difference of at most 180 Pa, at a boundary speed of approximately 2.62 m/s and a flow speed through the filter medium of approximately 0.13 m/s, the pleated filter is able to separate at least 90% of particles greater than 0.3 μm, at least 92% of particles greater than 0.5 μm, at least 93% of particles greater than 1 μm, and at least 97% of particles greater than 3 μm, as measured using the standard method DIN EN 60312 (IEC 60312) § 5.1.2.5.
When subject to a fractional efficiency test at an initial pressure difference of at most 180 Pascal at a boundary speed of approximately 2.62 m/s and a flow speed through the filter medium of approximately 0.13 m/s, the pleated filter, according to the present invention, is able to separate (as measured using the standard method DIN EN 60312 (IEC 60312) § 5.1.2.5) at least 90% of particles greater than 0.3 μm in size, at least 92% of particles greater than 0.5 μm, at least 93% of particles greater than 1 μm, and at least 97% of particles greater than 3 μm.
In an exemplary embodiment, the filter is one in which the filter paper layer has area weights of 30-70 g/m2, the microfiber nonwoven fabric layer has area weights of 20-80 g/m2, and the support nonwoven fabric layer has area weights of 10-60 g/m2. When subject to a fractional efficiency test at an initial pressure difference of at most 180 Pascal at a boundary speed of approximately 2.62 m/s and a flow speed through the filter medium of 0.13 m/s, the pleated filter is able to separate (as measured using the standard method DIN EN 60312 (IEC 60312) § 5.1.2.5) at least 95% of particles greater than 0.3 μm, at least 97% of particles greater than 0.5 μm, at least 98% of the particles greater than 1 μm and at least 99% of the particles of a size of at least 3 μm. Because of the low pressure resistance of the filter medium, the distance between the folds can be increased. No spacers are required, since the danger of folds touching one another does not exist. This allows a reduction in fabricating costs.
A filter, made of a paper filter layer with an area weight of about 50 g/m2, an electrostatically charged propylene microfiber nonwoven fabric layer of about 20 g/m2 and a propylene spunbonded nonwoven fabric of about 15 g/m2 is laminated to a filter medium having an area weight of 85±10 g/m2, and a thickness of 0.6±1 mm. The filter has an air permeability as per DIN 53438, at a pressure of 2 mbar, at an air flow rate greater than 200 l/m2/s. A filter with the dimensions 260×180×17 mm was tested using the standard method DIN 71460, part 1. The test volume stream was 120 m3/h at a boundary speed of approximately 2.62 m/s and a flow speed of approximately 0.13 m/s through the filter medium. Table 1 displays the results of the testing at an initial pressure difference of 173 Pascal.
Dust-Laden Gas Cleaned Gas
Particle Size Sampling Sampling Fractional Efficiency
Diameter (μm) 1(n) 2(n) 3(n) 1(n) 2(n) 3(n) 1(%) 2(%) 3(%) Xg(%)
>0.30 88027 87241 90322 4268 3892 4410 95 95 95 95
>0.50 34168 33805 35514 850 841 945 97 97 97 97
>1.00 20373 20264 21161 356 327 401 98 98 98 98
>3.00 753 748 748 4 1 1 99 99 99 99
>6.00 48 46 49 0 0 0 100 100 100 100
>10.00 25 21 25 0 0 0 100 100 100 100
Pressure Difference 172 173 172 173 173 172
Measuring Period (s) 60 60 60 60 60 60
Particle Count (1/l) 88027 87241 90322 4268 3892 4410
In contrast, a glass fiber filter paper with dimensions 260×180×17 mm was tested under the same conditions. Table 2 displays the result of the testing at initial pressure difference of 487 Pascal.
Particle Size DustLaden Gas Sampling Cleaned Gas Sampling Fractional Efficiency
Diameter (um) 1(n) 2(n) 3(n) 1(n) 2(n) 3(n) 1(%) 2(%) 3(%) Xg(%)
>0.30 90974 97190 96705 194 360 453 99 99 99 99
>0.50 32046 35192 35933 70 78 75 99 99 99 99
>1.00 17893 19942 20736 28 38 42 99 99 99 99
>3.00 296 352 405 0 2 0 100 99 100 99
>6.00 23 27 33 0 2 0 100 92 100 97
>10.00 11 15 18 0 1 0 100 93 100 97
Pressure Difference In (Pa) 488 489 489 488 488 490
Particle Count (1/l) 90974 97190 96705 194 360 453
1. A pleated filter made of a multi-layer filter medium, comprising:
at least one filter paper layer having area weights of 30 to 100 g/m2;
at least one microfiber nonwoven fabric layer having area weights of 5 to 120 g/m2;
at least one support nonwoven fabric layer of synthetic, polymeric fibers having area weights of 10 to 120 g/m2;
at least one fused polymer area contained within the fabric layers, the fused polymer area bonding the fabric layers to the paper layer, and making the fabric layers firmer within themselves; and
when subject to a fractional efficiency test at an initial pressure difference of at most 180 Pa, at a boundary speed of approximately 2.62 m/s and a flow speed through the filter medium of approximately 0.13 m/s, the pleated filter is able to separate, as measured using the standard method DIN EN 60312 (IEC 60312) § 5.1.2.5, at least 90% of particles greater than 0.3 μm, at least 92% of particles greater than 0.5 μm, at least 93% of particles greater than 1 μm, and at least 97% of particles greater than 3 μm.
2. The pleated filter according to claim 1, wherein the filter paper layer has area weights of 30 to 70 g/m2, the microfiber nonwoven fabric has area weights of 20 to 80 g/m2, and the support nonwoven fabric has area weights of 10 to 60 g/m2, and when subject to a fractional efficiency test at an initial pressure difference of at most 180 Pa, at a boundary speed of approximately 2.62 m/s and a flow speed through the filter medium of approximately 0.13 m/s, the pleated filter is able to separate, as measured using the standard method DIN EN 60312 (IEC 60312) § 5.1.2.5, at least 95% of particles greater than 0.3 μm, at least 97% of particles greater than 0.5 μm, at least 98% of particles greater than 1 μm, and at least 99% of particles greater than 3 μm.
US09810584 2000-03-17 2001-03-16 Pleated filter made of a multi-layer filter medium Expired - Fee Related US6488731B2 (en)
DE10013315 2000-03-17
DE2000113315 DE10013315C2 (en) 2000-03-17 2000-03-17 Pleated filter made of a composite filter media
DE10013315.0 2000-03-17
US20020011051A1 true US20020011051A1 (en) 2002-01-31
US6488731B2 true US6488731B2 (en) 2002-12-03
US09810584 Expired - Fee Related US6488731B2 (en) 2000-03-17 2001-03-16 Pleated filter made of a multi-layer filter medium
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EP1134013A1 (en) 2001-09-19 application
DE10013315C2 (en) 2002-06-06 grant
DE10013315A1 (en) 2001-09-27 application
US20020011051A1 (en) 2002-01-31 application
US20010003082A1 (en) 2001-06-07 Filter material construction and method
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SCHULTEIB, WOLFRAM;HERBERG, FELIX;STOCKLER, JORG;REEL/FRAME:012026/0131;SIGNING DATES FROM 20010521 TO 20010712