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EP1866052A1 - Sac a poussiere filtrant - Google Patents

Sac a poussiere filtrant

Info

Publication number
EP1866052A1
EP1866052A1 EP06818381A EP06818381A EP1866052A1 EP 1866052 A1 EP1866052 A1 EP 1866052A1 EP 06818381 A EP06818381 A EP 06818381A EP 06818381 A EP06818381 A EP 06818381A EP 1866052 A1 EP1866052 A1 EP 1866052A1
Authority
EP
European Patent Office
Prior art keywords
layer
dust filter
filter bag
bag according
inflow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06818381A
Other languages
German (de)
English (en)
Inventor
Dietmar Emig
Albrecht Klimmek
Ernst Raabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Neenah Gessner GmbH
Original Assignee
Neenah Gessner GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE200520018003 external-priority patent/DE202005018003U1/de
Priority claimed from DE200510054903 external-priority patent/DE102005054903B3/de
Application filed by Neenah Gessner GmbH filed Critical Neenah Gessner GmbH
Publication of EP1866052A1 publication Critical patent/EP1866052A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/10—Multiple layers

Definitions

  • the invention relates to a dust filter bag with excellent filtration properties, which in particular allow excellent deposition of fine and coarse dust and have an excellent service life.
  • EP-A-1 254 693 uses a prefilter layer which has a NaCl separation efficiency of at least 60% in order to increase its service life.
  • EP-A-0 960 645 provides a coarse filter layer which intercepts most of the impinging dust. This property is quantified in EP-A-960 645 on the basis of a degree of dust removal according to DIN 44956-2 of at least about 66 to 67% (for wet-laid so-called high-capacity paper).
  • Dust storage capacity is used.
  • a large thickness and a voluminous structure brings problems in bag production with it. For example, welding thick materials is often difficult.
  • due to the voluminous structure disadvantages in transport, storage and packaging of the dust filter bag. These factors increase costs.
  • WO 2005/060807 pursues a different approach to increase the service life of conventional dust filter bags with SMS structure.
  • fluidizable material is placed in the dust filter bag.
  • fibers and flakes such as chemical and natural fibers.
  • the additional filling of the dust filter bag with fluidizable material requires a further process step with additional costs and also contributes to the large volume of the dust filter bag, as the previously discussed coarse filter layer. This leads to the disadvantages already mentioned.
  • the problem to be solved according to the invention is to provide dust filter bags with excellent separation efficiency, both for fine and coarse dust, as well as excellent service life, which moreover are more cost-effective to manufacture, package, store and transport.
  • a dust filter bag which comprises at least one inflow layer and a filtration layer, which is arranged on the downstream side of the inflow layer and consists of an at least three-layer composite, and which is characterized in that the at least one inflow layer in the dust filter bag over a maximum of 7 % of its surface is connected to the filtration layer, and has a weight per unit area (ISO 536) of ⁇ 30 g / m 2 and a total NaCl separation of ⁇ 50%.
  • ISO 536 weight per unit area
  • a prefilter layer for example a dry-laid and electrostatically active nonwoven fabric is used.
  • the prefilter layer has a NaCl separation of at least 60% and is referred to as a relatively bulky electrostatically charged filter layer.
  • the prefilter layer preferably consists of staple fiber nonwoven fabric.
  • the dust filter bags according to the invention offer the mentioned advantages in terms of packaging, storage and transport.
  • the figure shows a graph in which the suction power is shown as a function of the applied amount of dust of a composite according to the invention over those of the prior art.
  • Basis weight ISO 536
  • Air permeability EN ISO 9237
  • Thickness ISO 534 (20 kPa).
  • the inflow layer (s) is (are) the decisive layer (s) for improving the service life over conventional filter arrangements.
  • the dust-laden air strikes first on the inflow layer or inflow layers and then on the filtration layer.
  • inflow layer is to be understood as meaning the layer or layers which are preceded by the filtration layer. Further layers on the outflow side of the filtration layer are possible, as long as the object according to the invention of an excellent separation efficiency for fine and coarse dust and an outstanding service life is not impaired.
  • the weight per unit area of the individual inflow layers is in each case ⁇ 30 g / m.sup.-1 and the NaCl removal rate in total, i. the sum of the degree of separation of all inflow layers ⁇ 50%.
  • the dust filter bag has only one inflow layer.
  • the feature that the at least one inflow layer in the dust filter bag is connected to the filtration layer over a maximum of 7% of its area includes the case where the inflow layer is not in any connection with the filtration layer, except at the side seam and / or at the dust inlet opening, for example the retaining plate has. In this case, the inflow layer is loose in the dust filter bag.
  • This embodiment of the invention is prefers. In the manufacture of the dust filter bag by laying the respective layers together and joining the layers along the circumference, the inventive inflow layer (s) and the filtration layer in the edge region of the bag can furthermore be connected to one another.
  • dust filter bags included in the scope of the invention, in which, apart from the side seam, there is also a connection over the actual filtration surface, provided that the maximum bonding area of 7% is not exceeded.
  • said bonding surface of the inflow layer (s) and the filtration layer is at most 5%, more preferably at most 3%, even more preferably at most 2%, and most preferably at most 1%. If there are several inflow layers in the dust filter bag, they can be connected to one another as desired, that is to say also over the entire surface, as long as the connection with the filtration layer is specified as in claim 1.
  • the inflow layer preferably covers at least 40%, more preferably at least 70%, and most preferably 100% of the downstream filtration layer.
  • the production of dust filter bags from the layers is well known to those skilled in the art.
  • the bag may be created by tubing from a web of the filter medium and closing the longitudinal seam. After cutting the hose to length, the hose ends are closed. This can be done either by two so-called winding floors or by a so-called block bottom and a changing bottom. For thermoplastic materials, the hose ends can also be closed by welding.
  • the dust inlet opening of the bag is generated before the hose formation, on which then the holding plate is applied.
  • two tracks of the filter medium or layer combinations are merged superimposed and then the bag produced by a circumferential seam.
  • the inlet opening is in this case produced in a web before the merging of the two webs and often immediately after the holding plate is applied, d. H. before the actual bag production.
  • the bonding of the webs can take place both by adhesive techniques and in thermoplastic filter media by welding - thermally or by means of ultrasound.
  • the at least one inflow layer has a total NaCl separation efficiency (i.e., a separation efficiency of all inflow layers) of preferably ⁇ 40%, more preferably ⁇ 30% and most preferably ⁇ 20%.
  • a total NaCl separation efficiency i.e., a separation efficiency of all inflow layers
  • Staubabscheidegrad is preferably ⁇ 30% and most preferably ⁇ 20%.
  • the at least one inflow layer has a NaCl separation efficiency and a degree of dust separation of ⁇ 20% (in total).
  • the degree of separation depends on the fiber thickness. The thinner a fiber is, the higher the degree of separation of the corresponding layer. Another influencing factor is the electrostatic charge. The higher the charge of the filter medium, the higher its degree of separation, especially for fine particles. Furthermore, the degree of separation can be achieved by the use of triboelectric Fibers, as described in EP-AI 254 693, further increase.
  • the thickness of the medium also influences the separation efficiency. So the higher the degree of separation, the thicker the material is.
  • the porosity of the medium also influences the separation efficiency. The lower the porosity of a medium, ie the denser it is, the higher its degree of separation.
  • the pore size or the free pore volume also influence the degree of separation: the smaller the pores are, the higher the separation efficiency of the medium.
  • Spun nonwovens and thermoplates are preferably used as materials of the at least one inflow layer. Furthermore, materials produced by the spunmelt process can be used. In addition, dry laid staple fiber webs, as well as wet-laid media, in particular nonwovens in question, which contain a proportion of synthetic fibers of at least 20% or consist entirely of synthetic fibers. The methods of preparation of such sheets are described in the literature, e.g. in "Nonwovens", edited by W. Albrecht, H. Fuchs and W. Kittelman, Wiley-VCH Verlag, Weinheim 2000.
  • the air permeability of the at least one inflow layer is preferably 1,500 to 10,000, more preferably 3,000 to 8,000, and still more preferably 4,000 to 6,000 l / m 2 s.
  • Their porosity is preferably> 95%, particularly preferably> 98%.
  • Their thickness is preferably 0.05 to 0.25 mm, more preferably 0.1 to 0.2 mm.
  • the basis weight is preferably in each case 10 to 25 g / m 2 , more preferably 10 to 20 g / m 2 and very particularly preferably 12 to 16 g / m 2 .
  • the filtration layer qualifies as such due to its Staubabscheidegrades (according to DIN 44956-2) of at least 80%, preferably at least 85%, more preferably at least 90%, more preferably at least 95% and in particular 99% and more.
  • the three-layer composite of the filtration layer is not particularly limited with respect to the materials of the individual layers, as long as it has such a degree of dust removal according to DIN 44956-2.
  • the layers in the o.g. Combinations of the filtration layer connected as follows (the partial connection of the individual layers over the entire surface by gluing / welding is each marked with a "-", a lack of connection over the surface, ie at most a connection on the side seam and / or the dust inlet opening "/”):
  • SMS spunbond Meltblown fleece spunbond
  • the Spinnvliesläge the SMS composite which faces the Anström für is at least partially connected over the entire surface with the subsequent Meltblownlage.
  • all individual layers of the SMS composite over their entire surface, at least partially connected to each other.
  • the partial connection of the layers with one another is to be understood as meaning a compound in which 0.1 to 30%, preferably 0.2 to 10%, particularly preferably 0.3 to 2%, of the relevant layer surfaces are connected to one another.
  • the meltblown web which according to the invention preferably represents at least one layer of the composite of the filtration layer, advantageously has a basis weight of 10 to 120 g / m 2 , more preferably in the range of 25 to 50 g / m 2 , in particular in the range of 30 to 45 g / m 2 .
  • the MeItblown layer has a thickness of 0.10 to 4 mm, preferably 0.18 to 3 mm.
  • the MeItblown layer preferably has an air permeability of 100 to 2,000 l / m 2 s, more preferably 200 to 1,500 l / m 2 s, particularly preferably from 250 to 600 l / m 2 s ,
  • the pore diameter of the meltblown layer is preferably 15 to 60 .mu.m, particularly preferably 25 to 40 .mu.m, and the average fiber diameter is preferably between 0.5 and 18 .mu.m, more preferably between 1 and 3 .mu.m.
  • the breaking resistance of the Meltblown layer preferably in the longitudinal direction 2 to 12 N / 15 mm strip width and in the transverse direction 1 to 10 N / 15 mm strip width.
  • the Staubabscheidegrad (according to DIN 44956-2) of the meltblown layer is preferably in the range of 80% to nearly 100%.
  • the meltblown layer is provided with a permanent electrostatic charge in order to achieve even better dust separation of fine particles.
  • additional electrical filtration due to an electrostatic attraction of filter material and oppositely charged dust particles.
  • the fibers of the nonwoven preferably carry spatially separated bipolar charges.
  • the electrostatic charge can be achieved by exposing the filter materials to an electric field during nonwoven production. The methods used are described in the literature, see e.g. Martin Davis, Electrostatic Medium Spinning Process Delivers Unique Properties, Non-Woven World, September 1987, pp. 51-54, or Troulihet, Y .; Moosmayer, P .; New Method of Manufacturing Non-Wovens by Electrostatic Laying, presented at Index 81 Congress.
  • the meltblown layer can be produced by a meltblown process (eg Exxon process).
  • a meltblown process eg Exxon process
  • the fiber material is melted, extruded, stretched at the exit of the filaments from the spinneret with hot air, vortexed, placed on a sieve (sieve or cylinder design) and finally removed from this as a sheet.
  • the meltblown layer typically consists of long, fine fibers with average fiber diameters of 0.5 to 18 ⁇ m, which are common for meltblowns. Further details on usable meltblown layers can be found in EP-AO 338 479.
  • the porosity was calculated according to the following formula
  • volume fleece (area X thickness);
  • volume of fibers weight of nonwoven of equal area / density
  • the suction power of a Siemens vacuum cleaner (DINO XS 1800W) was determined at different bag filling levels. When Dust was used DMT 8 test dust.
  • the suction power (in l / s) was determined on the suction tube by means of a rotameter.
  • Fig. 1 shows the results. In the designation of the layer orders in FIG. 1, a hyphen between adjacent layers symbolizes a bond by means of punctiform ultrasonic welding, wherein the pressing surface was about 1% of the total filtration area. A slash between two adjacent layers indicates that the layers are not connected to one another via the filtration surface but only at the side seam and in the region of the dust inlet opening.
  • the calculated percentage area of contact and filtration layer of the tested dust filter bags at the side seam and at the dust inlet was in the range of 2.5 to 2.7%. All spunbonded nonwovens used having a basis weight below 30 g / m.sup.-1 have a degree of separation (both for NaCl as well as for dust) of well below 50%.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)

Abstract

La présente invention concerne un sac à poussière filtrant comprenant au moins une couche d'entrée de l'air et une couche de filtration disposée sur la face de sortie de l'air de la couche d'entrée de l'air. La couche de filtration est constituée d'un composite comportant au moins trois couches. La ou les couches d'entrée de l'air du sac à poussière filtrant sont accompagnées sur au plus 7 % de leur surface de la couche de filtration. La couche d'entrée de l'air ou chacune des couches d'entrée de l'air présente un grammage (ISO 536) < 30 G/M<SUP>2</SUP>. Le degré d'élimination de NaCl de la ou des couches d'entrée de l'air est au total < 50 %. Le sac à poussière filtrant présente un excellent degré d'élimination, aussi bien pour les poussières fines que pour les poussières de plus grande taille, et notamment une excellente durée de vie et une excellente durée en aspirateur, améliorées par rapport aux sacs à poussière filtrants traditionnels.
EP06818381A 2005-11-17 2006-11-06 Sac a poussiere filtrant Withdrawn EP1866052A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE200520018003 DE202005018003U1 (de) 2005-11-17 2005-11-17 Staubfilterbeutel
DE200510054903 DE102005054903B3 (de) 2005-11-17 2005-11-17 Staubfilterbeutel
PCT/EP2006/010613 WO2007057108A1 (fr) 2005-11-17 2006-11-06 Sac a poussiere filtrant

Publications (1)

Publication Number Publication Date
EP1866052A1 true EP1866052A1 (fr) 2007-12-19

Family

ID=37762466

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06818381A Withdrawn EP1866052A1 (fr) 2005-11-17 2006-11-06 Sac a poussiere filtrant

Country Status (2)

Country Link
EP (1) EP1866052A1 (fr)
WO (1) WO2007057108A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012100431A1 (de) * 2012-01-19 2013-07-25 Miele & Cie. Kg Mehrlagiges Filtermaterial für einen Staubsaugerbeutel

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1440801A (en) * 1999-10-29 2001-05-14 Hollingsworth And Vose Company Filter media
DE50109779D1 (de) * 2000-02-10 2006-06-22 Freudenberg Carl Kg Staubfilterbeutel
ES2208481T3 (es) * 2001-03-02 2004-06-16 Airflo Europe N.V. Filtro de material compuesto y procedimiento de fabricacion.
DE10120223B4 (de) * 2001-04-24 2005-08-25 Carl Freudenberg Kg Mehrlagiger Luftfilter und dessen Verwendung
SI1415699T1 (en) * 2002-12-06 2004-12-31 Eurofilters N.V. Filter medium for a vacuum cleaner bag

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007057108A1 *

Also Published As

Publication number Publication date
WO2007057108A1 (fr) 2007-05-24

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