EP2442702B2 - Sac plat pour aspirateur - Google Patents

Sac plat pour aspirateur Download PDF

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Publication number
EP2442702B2
EP2442702B2 EP10721327.4A EP10721327A EP2442702B2 EP 2442702 B2 EP2442702 B2 EP 2442702B2 EP 10721327 A EP10721327 A EP 10721327A EP 2442702 B2 EP2442702 B2 EP 2442702B2
Authority
EP
European Patent Office
Prior art keywords
bag
flat bag
diffuser
bag according
flat
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.)
Active
Application number
EP10721327.4A
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German (de)
English (en)
Other versions
EP2442702A1 (fr
EP2442702B1 (fr
Inventor
Jan Schultink
Ralf Sauer
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.)
Eurofilters NV
Original Assignee
Eurofilters NV
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
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Application filed by Eurofilters NV filed Critical Eurofilters NV
Priority to EP10721327.4A priority Critical patent/EP2442702B2/fr
Publication of EP2442702A1 publication Critical patent/EP2442702A1/fr
Application granted granted Critical
Publication of EP2442702B1 publication Critical patent/EP2442702B1/fr
Publication of EP2442702B2 publication Critical patent/EP2442702B2/fr
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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • A47L9/102—Dust separators
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • A47L9/14—Bags or the like; Rigid filtering receptacles; Attachment of, or closures for, bags or receptacles

Definitions

  • the present invention relates to a flat bag for vacuum cleaners, which has in its interior at least one diffuser, which forms an intermediate level and is made of flat structures with elongated flow openings.
  • Such flat bags are characterized by an excellent dust storage capacity and an extension of the service life.
  • EP 1 787 560 shows flow distributors in the form of boxes or material strips attached in the area of the inlet opening of the filter bag, which are able to divide and deflect the incoming air flow into partial flows.
  • the idea is expanded to the effect that a second flow distributor complements the function of the first flow distributor. From the DE 20 2008 008 989 and the DE 20 2008 003 248 combinations of two flow distributors with a spacer are known.
  • a filter bag which comprises a bag with an interior which is divided into at least two chambers.
  • the division is accomplished by a partition defined on three side edges, with a transition between the first and second chambers being formed on the fourth side edge.
  • the partition is welded to the filter layers only on one side edge for the entire length and is welded on the opposite side to a strip on the top layer of filter material.
  • the DE 20 2008 007 717 describes a filter bag in which a flat, multi-layer filter insert is arranged in the interior, which is at least partially connected to the filter bag walls. Dust should be stored between the at least two layers of the filter insert.
  • the upper of the two layers can be perforated or slotted.
  • the filter insert can be formed as a continuous strip which is attached to two opposite edges of the bag.
  • the DE 20 2007 010 692 relates to a filter bag in which a filling layer of fiber or yarn material extends between the two filter walls, which is connected to both filter walls and is pulled apart when the bag is unfolded in such a way that a net-like structure is formed in the bag.
  • a dust filter bag with a baffle piece fitted inside is known.
  • This baffle piece is attached in front of the inlet opening of the bag in such a way that it bulges out during operation and forms two outlet openings through which the air flow is deflected. It is essential to the invention that the baffle wall piece is attached at a distance from the bag seam and does not come into contact with the rear bag wall under the pressure of the air flow.
  • Another air distributor is from the DE 10 2006 051 117 known. At least two layers of material are arranged one above the other between the bag walls, the layers having a smaller extent than the two bag walls in a first surface direction and having the same extent as the bag walls in the surface direction orthogonal to the first surface direction. Microfiber fleece or paper are mentioned as materials.
  • the DE 2006 016 304 discloses a bag with at least one guide element, by means of which the incoming air flow can be deflected.
  • the guide element is fixed adjacent to the inflow opening.
  • a Miele bag already on the market has a deflector arrangement mounted immediately below the inlet opening.
  • This deflection device consists of a sheet which is attached directly to the top of the bag on both sides of the inlet opening. The purpose of this deflection device is to deflect the air flow sucked in through the inlet opening directly in the area of the inlet opening.
  • This deflection device is designed in such a way that, due to a predetermined length or area, it is welded directly to the bag wall at a distance from the inlet opening. The area of this deflection device is therefore below approx. 10% of the bag surface.
  • This filter bag is in 3 sketched.
  • this vacuum cleaner bag has a second level of flow straighteners.
  • the U.S. 6,063171 relates to a bactericidal block bottom filter bag having several fingers 30 each arranged on a strip 31 of material.
  • a flat bag is thus provided with a bag top and a bag bottom, the bag walls of which are formed from an air-permeable filter material and with an inlet opening for the air to be filtered being made in the bag top, in which inside the flat bag between the bag top and the bag bottom in at least one diffuser is arranged exclusively in an intermediate plane, which diffuser consists of flat material structures which have elongated flow openings, the at least one diffuser being connected to the bag wall on at least one side.
  • the diffusers which are formed from sheetlike structures provided with flow openings, cause the inflowing air laden with dirt and/or dust particles to be swirled. Surprisingly, the service life of the bag can thus be significantly extended.
  • the flat bags according to the present invention contain at least one diffuser in an intermediate level for turbulence of the sucked-in dust particles.
  • this intermediate plane is understood to mean a curved or uncurved surface which is arranged between the top and bottom of the bag forming the bag wall.
  • the intermediate level within the meaning of the invention is thus defined by the arrangement of the diffuser inside the filter bag by connecting the diffuser to at least one point on the bag wall.
  • the diffuser made of a pliable material consists of flat structures that have flow openings in the form of slots within these flat structures.
  • Such fabrics thus have at least one slit or a severance, which, however, is not pronounced continuously over the entire fabric, so that at the ends of the fabric, i.e. where there is no slit, the fabric is held together.
  • the geometric shape of the geometric shapes formed by the flow openings on the fabric is essentially irrelevant; the fabrics can be structured by straight slits, but all other possible geometric shapes are also possible for fabrics, for example S-shaped slits, but also perforations, etc.
  • the diffuser is arranged in the form of flat structures with elongated flow openings in the first plane directly below the top of the filter bag in the area of the inlet opening, with this diffuser being attached on both sides to the top of the bag and its area being less than 10% on the entire surface of the bag, the width of the material strips defined by the slits being defined as ⁇ 50% in relation to the diameter of the inflow opening, except.
  • the diffuser is shorter than the overall length or width of the flat bag. Both ends of the diffuser, which is designed as a slotted surface structure, are fixed directly to the top of the bag. The diffuser completely covers the inlet opening.
  • the filter bags have an excellent dust storage capacity and thus have a longer service life. It can also be observed that blockages in the area of the air inlet of the bag - as is the case with the bags known from the prior art according to FIG 3 can often be the case - could be avoided.
  • the elongate flow openings of the fabric are linear.
  • the flow openings can be designed in parallel or in a meandering or zigzag shape, and spiral lines are also conceivable.
  • the linear, elongate flow openings have different lengths within the fabric.
  • This embodiment of the invention comes into play when there are at least two flow openings on the fabric.
  • This flow openings can have different lengths, which leads to improved stability of the diffuser.
  • the at least one diffuser is attached to the bag wall on both sides.
  • the diffuser is thus fixed to the upper side of the bag or the lower side of the bag. It is preferably fixed in the end area of the diffuser so that it is only connected to the bag wall at certain points and is flexible in the area in between due to the limp material and can be moved by the inflowing air.
  • the diffuser has approximately the same length and/or width as the top or bottom of the bag.
  • the diffuser can then be fixed in place by inserting the ends of the diffuser between the top and bottom of the filter bag and fixing them together with the top and bottom to form the finished bag.
  • the fixation of the diffuser thus takes place at the same time as the gluing or welding step for producing the filter bag itself. In this respect, this fixation option enables the filter bag to be produced in an extremely cost-effective and simple manner.
  • the diffuser it is also possible for the diffuser to be narrower and/or shorter than the top or bottom of the bag. It is also possible here that the diffuser has a greater length and/or width than the top or bottom of the bag and is folded.
  • the diffusor is expediently folded when the length of the diffusor is greater than the dimension of the length and/or width of the filter bag.
  • the folding is then expediently carried out in a zigzag form, with the strips of the diffuser partially overlapping one another, for example in the case of a diffuser in the form of strips. In this respect, an increase in the contact surface for the inflowing air is made possible, which leads to a further improvement in the properties of the filter bag.
  • At least two diffusers can also be arranged in the intermediate plane in such a way that the elongated flow openings are not parallel, e.g. orthogonal, but are also arranged in different arrangements.
  • the air streams entering the filter bag can be swirled in a targeted manner.
  • the flexible materials of the diffuser preferably consist of air-permeable materials and/or air-impermeable materials.
  • Foils for example plastic foils (e.g. PE or PP), are particularly suitable as air-impermeable materials.
  • Laminates of air-permeable materials and/or air-impermeable materials provided with flow openings are preferably used as air-permeable materials.
  • the diffuser is connected to the bag wall via an adhesive point and/or weld points.
  • the flat bag is formed by two strips of the filter material welded to one another in the edge area.
  • the flat bag can be designed in any geometric shape, in particular square, hexagonal or octagonal shapes are possible.
  • the diffuser is connected to the edge area of the flat bag.
  • the present flat bag according to the invention is a gusseted bag.
  • the diffuser is preferably connected to the gusset of the flat bag.
  • the inside of the top of the filter bag has a film (e.g. a PE film) in the area of the air inlet opening.
  • a film e.g. a PE film
  • This foil can, for example, be glued or welded. As a result, dust deposits can be almost completely avoided during operation in the area of the inlet opening, so that the closing function of the flap closing the inlet opening is not impaired.
  • the filter bags used in the examples are shown in the figures below to illustrate the internal arrangement of the diffusers.
  • the bags are viewed in projection with a view of the top of the bag from the bottom of the bag.
  • all diffusers are formed from strips of a three-ply non-woven material.
  • an arrangement of the diffusers "along” means a vertical arrangement of the diffusers shown in the figures, while “transverse” means a horizontal arrangement of the diffusers within the filter bag. A distinction in this regard is necessary since the inlet opening is arranged asymmetrically with respect to the center of gravity of the filter bag.
  • the filter bags shown (model GN from Miele) were measured in a series of tests (carried out with a Miele vacuum cleaner, type 5210) with defined amounts of DMT standard dust type 8 (50-400 g, each at 50 g intervals).
  • DMT standard dust type 8 50-400 g, each at 50 g intervals.
  • DIN EN-ISO 60312. The measured values are given for the filter bags in Table 1.
  • the two bottom rows of the table each show the measured pressure loss in % after picking up 200 or 400 g DMT standard dust, with this value divided by the measured pressure value after picking up the respective amount of dust, based on the measured pressure, with the dust filter bag inserted in the vacuum cleaner was determined without prior ingestion of dust.
  • the filter bags according to Figures 4 - 21 however, compared to the filter bag according to comparative example 3*, they always offer the advantage that blockages in the area of the inlet opening are prevented by the very short flow straightener SR1 of the filter bag (see figure 3 ) can be avoided almost entirely.
  • FIG 22 are selected test results with the filter bags according to Figures 4 - 21 compared to the filter bags according to Comparative Examples 1* to 3*.
  • the measured values obtained are compared with those of comparative examples 1* to 3*.
  • the filter bags according to Figures 4 - 21 are clearly superior to the filter bags according to Comparative Examples 1* and 2* in terms of pressure drop for a previously defined amount of dust absorbed, while the filter bag according to Comparative Example 3* shows the same results or slight improvements.
  • Advantageous with the vacuum cleaner filter bags according to Figures 4 - 21 with respect to those of Comparative Example 3* is that the filter bags according to Figures 4 - 21 less prone to clogging in the area of the inflow opening.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Filters For Electric Vacuum Cleaners (AREA)
  • Filtering Materials (AREA)
  • Bag Frames (AREA)

Claims (22)

  1. Sachet plat avec un côté supérieur de sachet et un côté inférieur de sachet, dont les parois de sachet sont constituées d'un matériau filtrant perméable à l'air et une ouverture d'entrée étant réalisée dans le côté supérieur du sachet pour l'air à filtrer,
    caractérisé en ce que
    à l'intérieur du sachet plat, entre le côté supérieur du sachet et le côté inférieur du sachet, exclusivement dans un plan intermédiaire, se trouve un diffuseur qui est constitué de structures en matériau plat, qui présentent des ouvertures d'écoulement oblongues, et en ce que l'au moins un diffuseur est relié avec la paroi du sachet au niveau d'au moins un côté.
  2. Sachet plat selon la revendication 1, caractérisé en ce qu'un diffuseur sous la forme de structures plates avec des ouvertures d'écoulement oblongues, qui est fixé au niveau de l'ouverture d'entrée en recouvrant celles-ci et au niveau du côté supérieur du sachet, est exclu, avec une surface < 10 % de la surface totale du sachet, la largeur des bandes de matériau étant définie par le diamètre de l'ouverture d'écoulement ± 50 %.
  3. Sachet plat selon au moins l'une des revendications 1 à 2, caractérisé en ce que les ouvertures d'écoulement oblongues de la structure plate sont linéaires.
  4. Sachet plat selon la revendication 3, caractérisé en ce que les ouvertures d'écoulement linéaires sont conçues de manière parallèle et/ou sinueuse et/ou en zigzag.
  5. Sachet plat selon la revendication 3 ou 4, caractérisé en ce que les ouvertures d'écoulement linéaires oblongues présentent des longueurs différentes.
  6. Sachet plat selon au moins l'une des revendications 1 à 5, caractérisé en ce que le diffuseur est fixé des deux côtés à la paroi de sachet.
  7. Sachet plat selon au moins l'une des revendications 1 à 6, caractérisé en ce que le diffuseur présente approximativement la même longueur et/ou la même largeur que le côté supérieur ou inférieur du sachet.
  8. Sachet plat selon au moins l'une des revendications 1 à 7, caractérisé en ce que le diffuseur est plus étroit et/ou plus court que le côté supérieur ou inférieur du sachet.
  9. Sachet plat selon au moins l'une des revendications 1 à 8, caractérisé en ce que le diffuseur présente une longueur et/ou une largeur supérieure à celle du côté supérieur ou inférieur du sachet et se présente de manière pliée.
  10. Sachet plat selon au moins l'une des revendications 1 à 9, caractérisé en ce que le diffuseur est conçu sous la forme de bandes de matériau tournées et/ou torsadées.
  11. Sachet plat selon au moins l'une des revendications 1 à 10, caractérisé en ce que, dans le plan intermédiaire, se trouvent au moins deux diffuseurs disposés l'un par rapport à l'autre de façon à ce que les bandes de matériau et/ou les ouvertures d'écoulement oblongues ne sont pas disposées parallèlement entre elles.
  12. Sachet plat selon la revendication 11, caractérisé en ce que les au moins deux diffuseurs sont disposés de manière orthogonale entre eux.
  13. Sachet plat selon la revendication 12, caractérisé en ce que les au moins deux diffuseurs sont disposés avec une disposition différente d'une disposition orthogonale.
  14. Sachet plat selon au moins l'une des revendications 1 à 13, caractérisé en ce que les matériaux des diffuseurs sont constitués de matériaux perméables à l'air et/ou de matériaux imperméables à l'air.
  15. Sachet plat selon la revendication 14, caractérisé en ce que les matériaux imperméables sont un film.
  16. Sachet plat selon la revendication 14, caractérisé en ce que les matériaux perméables à l'air sont constitués d'un stratifié de matériaux perméables à l'air et/ou de matériaux imperméables à l'air munis d'ouvertures d'écoulement.
  17. Sachet plat selon au moins l'une des revendications 1 à 16, caractérisé en ce que le diffuseur est relié à la paroi du sachet par l'intermédiaire d'un point de collage et/ou de points de soudure.
  18. Sachet plat selon au moins l'une des revendications 1 à 17, caractérisé en ce que le sachet plat est constitué de deux bandes de matériau filtrant soudées entre elles au niveau du bord.
  19. Sachet plat selon au moins l'une des revendications 1 à 18, caractérisé en ce que le sachet est quadrangulaire, hexagonal ou octogonal.
  20. Sachet plat selon la revendication 18 ou 19, caractérisé en ce que le diffuseur est relié avec le bord du sachet plat.
  21. Sachet plat selon au moins l'une des revendications 1 à 17, caractérisé en ce que le sachet plat est un sachet à plis latéraux.
  22. Sachet plat selon la revendication 21, caractérisé en ce que le diffuseur est relié avec le pli latéral du sachet plat.
EP10721327.4A 2009-06-19 2010-05-17 Sac plat pour aspirateur Active EP2442702B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10721327.4A EP2442702B2 (fr) 2009-06-19 2010-05-17 Sac plat pour aspirateur

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP09008064.9A EP2263507B1 (fr) 2009-06-19 2009-06-19 Sac plat pour aspirateur
PCT/EP2010/003018 WO2010145740A1 (fr) 2009-06-19 2010-05-17 Sac plat pour aspirateur
EP10721327.4A EP2442702B2 (fr) 2009-06-19 2010-05-17 Sac plat pour aspirateur

Publications (3)

Publication Number Publication Date
EP2442702A1 EP2442702A1 (fr) 2012-04-25
EP2442702B1 EP2442702B1 (fr) 2016-08-31
EP2442702B2 true EP2442702B2 (fr) 2023-01-11

Family

ID=41259437

Family Applications (4)

Application Number Title Priority Date Filing Date
EP09008064.9A Active EP2263507B1 (fr) 2009-06-19 2009-06-19 Sac plat pour aspirateur
EP18196359.6A Active EP3443880B1 (fr) 2009-06-19 2009-06-19 Sachet plat pour aspirateur
EP17160494.5A Active EP3195782B1 (fr) 2009-06-19 2009-06-19 Sachet plat pour aspirateur
EP10721327.4A Active EP2442702B2 (fr) 2009-06-19 2010-05-17 Sac plat pour aspirateur

Family Applications Before (3)

Application Number Title Priority Date Filing Date
EP09008064.9A Active EP2263507B1 (fr) 2009-06-19 2009-06-19 Sac plat pour aspirateur
EP18196359.6A Active EP3443880B1 (fr) 2009-06-19 2009-06-19 Sachet plat pour aspirateur
EP17160494.5A Active EP3195782B1 (fr) 2009-06-19 2009-06-19 Sachet plat pour aspirateur

Country Status (9)

Country Link
US (1) US8702828B2 (fr)
EP (4) EP2263507B1 (fr)
CN (1) CN102802484B (fr)
AU (1) AU2010262163B2 (fr)
DE (1) DE202010018626U1 (fr)
DK (3) DK3195782T3 (fr)
ES (4) ES2694479T3 (fr)
PL (3) PL3195782T3 (fr)
WO (1) WO2010145740A1 (fr)

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ES2508291T3 (es) * 2010-03-19 2014-10-16 Eurofilters Holding N.V. Bolsa de filtro de aspiradora
ES2713045T3 (es) 2011-03-22 2019-05-17 Eurofilters Nv Dispositivo ecológicamente eficiente para la aspiración de polvo
DE202011108953U1 (de) 2011-12-02 2012-01-19 Branofilter Gmbh Staubfilterbeutel mit einer Staubfängereinlage
DE102011120688B4 (de) 2011-12-02 2019-05-16 Branofilter Gmbh Staubfilterbeutel mit einer Staubfängereinlage
EP2644077A1 (fr) 2012-03-27 2013-10-02 Jan Schultink Procédé d'optimisation d'un dispositif d'aspiration doté d'un aspirateur manuel, compact ou vertical et d'un sac filtrant
EP2644075A1 (fr) 2012-03-27 2013-10-02 Jan Schultink Procédé d'optimisation d'un dispositif d'aspiration doté d'un aspirateur de sol ou vertical et d'un sac filtrant
DE102013100795A1 (de) * 2013-01-28 2014-07-31 Miele & Cie. Kg Filterbeutel für Staubsauger
ES2566904T3 (es) 2013-03-15 2016-04-18 Eurofilters Holding N.V. Bolsa de filtro de aspirador
CN104116462B (zh) * 2013-04-26 2017-06-30 天佑电器（苏州）有限公司 过滤袋及具有该过滤袋的吸尘器
EP2835087B1 (fr) 2013-08-09 2018-10-10 Eurofilters N.V. Sac filtrant d'aspirateur avec élément d'écartement
EP3305155B1 (fr) 2016-10-06 2019-05-22 Eurofilters N.V. Sac d'aspirateur en matériaux textiles recyclés et/ou de linters de coton
US12016515B2 (en) 2016-03-17 2024-06-25 Eurofilters N.V. Vacuum cleaner filter bag with recycled textile materials and/or cotton liners
DK3219376T3 (en) 2016-03-17 2019-01-14 Eurofilters Nv Vacuum cleaner filter bag of recycled plastics

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EP2198765A2 (fr) † 2008-12-10 2010-06-23 Wolf PVG GmbH & Co. KG Sac d'aspirateur et procédé de fabrication d'un sac d'aspirateur

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Publication number Priority date Publication date Assignee Title
US3370405A (en) † 1964-12-18 1968-02-27 Studley Paper Company Inc Vacuum cleaner filter bags and method of manufacturing same
WO2007059939A1 (fr) † 2005-11-22 2007-05-31 Eurofilters Holding N.V. Sac filtrant d'aspirateur et utilisation d'un sac filtrant d'aspirateur
DE102008045683A1 (de) † 2008-09-04 2010-03-11 Branofilter Gmbh Staubfilterbeuteleinrichtung für einen Staubsauger
EP2198765A2 (fr) † 2008-12-10 2010-06-23 Wolf PVG GmbH & Co. KG Sac d'aspirateur et procédé de fabrication d'un sac d'aspirateur

Also Published As

Publication number Publication date
CN102802484B (zh) 2016-08-03
AU2010262163A1 (en) 2012-01-19
EP2442702A1 (fr) 2012-04-25
ES2595602T3 (es) 2017-01-02
DK2263507T3 (en) 2019-01-14
DE202010018626U1 (de) 2019-05-09
DK3443880T3 (da) 2021-07-26
WO2010145740A1 (fr) 2010-12-23
AU2010262163B2 (en) 2016-03-24
DK3195782T3 (en) 2019-04-15
CN102802484A (zh) 2012-11-28
US8702828B2 (en) 2014-04-22
ES2694479T3 (es) 2018-12-21
EP3195782A1 (fr) 2017-07-26
EP3443880B1 (fr) 2021-05-12
EP2263507B1 (fr) 2018-09-19
US20120272628A1 (en) 2012-11-01
PL3195782T3 (pl) 2019-07-31
ES2595602T5 (es) 2023-03-30
EP3443880A1 (fr) 2019-02-20
EP2263507A1 (fr) 2010-12-22
EP2442702B1 (fr) 2016-08-31
EP3195782B1 (fr) 2019-01-09
PL3443880T3 (pl) 2021-12-06
ES2716753T3 (es) 2019-06-14
PL2263507T3 (pl) 2019-02-28
ES2876248T3 (es) 2021-11-12

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