EP0403840B1 - Verbundvliesmaterial - Google Patents

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Publication number
EP0403840B1
EP0403840B1 EP90110183A EP90110183A EP0403840B1 EP 0403840 B1 EP0403840 B1 EP 0403840B1 EP 90110183 A EP90110183 A EP 90110183A EP 90110183 A EP90110183 A EP 90110183A EP 0403840 B1 EP0403840 B1 EP 0403840B1
Authority
EP
European Patent Office
Prior art keywords
filaments
woven material
components
composite nonwoven
nonwoven material
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.)
Expired - Lifetime
Application number
EP90110183A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0403840A1 (de
Inventor
Heinz-Horst Boich
Gerhard Knitsch
Andreas Kirsch
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.)
Corovin GmbH
Original Assignee
Corovin 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6383098&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0403840(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Corovin GmbH filed Critical Corovin GmbH
Priority to AT90110183T priority Critical patent/ATE100506T1/de
Publication of EP0403840A1 publication Critical patent/EP0403840A1/de
Application granted granted Critical
Publication of EP0403840B1 publication Critical patent/EP0403840B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H5/00—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length
    • D04H5/06—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length strengthened or consolidated by welding-together thermoplastic fibres, filaments, or yarns

Definitions

  • the invention relates to a composite nonwoven material consisting of at least two components according to the preamble of patent claim 1.
  • Composite nonwoven materials made from composite spunbonded nonwovens - also known as "composites” - are already known. These are composite or laminated nonwovens made from several layered components.
  • needle felt floor coverings from at least two layers, which differ significantly from each other in the fiber material, the fineness and the color. This makes combinations of properties achieved that can hardly or not be achieved with a single-layer structure of a spunbond.
  • nonwoven materials that are used as interlinings in the clothing industry are manufactured as composites, and the same also applies to a number of special filters or to modern covering systems in the medical field.
  • composite nonwoven materials or composites are often also used, in the construction of which, in addition to endless filaments, microfibers are also involved.
  • a layered structure of a composite nonwoven material with two layers is known.
  • This composite nonwoven material comprises on the one hand a nonwoven layer made of thin thermoplastic molecularly oriented filaments with an average diameter of more than 12 ⁇ m and on the other hand an associated nonwoven layer made of short fibers with an average diameter of less than 10 ⁇ m.
  • the latter fiber layer is through a microfiber fleece is formed from short thermoplastic fibers, the softening temperature of which is 10 - 40 ° C lower than the softening temperature of the continuous filaments of the first-mentioned fleece layer.
  • the non-woven thread layer made of the molecularly oriented continuous threads is solidified by spot melt embossing with the non-woven microfiber layer without the continuous threads existing there merging at the embossing locations, and in the areas between the embossing locations the continuous threads of the thread layer remain unbound.
  • the two discrete layers described so far namely the fiber fleece layer and the microfiber fleece lie surface to surface and are laminated and bonded to one another in the discrete melt embossing points by the simultaneous action of heat and pressure. This results in the desired textile-like appearance and drapability.
  • the layer consisting of essentially endless molecularly oriented threads is so solidified that it takes on the function of a load-bearing component in the composite nonwoven material with regard to the mechanical strength.
  • the initially unconsolidated thread nonwoven layer is combined with the continuous threads with the already consolidated microfiber nonwoven layer, which is already consolidated and is removed from a roll, as is shown in FIG. 2 of DE-PS 23 56 720 is shown.
  • microfiber nonwoven layer is therefore consolidated so far before its connection to the thread nonwoven layer, and already has such a mechanical stability that it can be stored on a roll and pulled off this roll in order to produce the composite nonwoven material with the two discrete layers, whereby after the joining of the loose unconsolidated nonwoven layer with the continuous threads and the already consolidated microfiber nonwoven layer, the laminar composite nonwoven material is consolidated with a bonding calender.
  • An essential feature of the known composite nonwoven material described so far consists in the laminar structure of individual layers which are separated from one another by clear phase boundaries.
  • multilayer composite nonwoven materials with phase boundaries present in cross section is to combine the properties and functions of the individual discrete nonwoven layers with one another for intended use.
  • the thread nonwoven layer from the molecularly oriented continuous threads takes on a carrier function of the material, and the function of a suction or filtration layer can be assigned to the other microfiber nonwoven layer. Overall, this results in a mechanically stable composite nonwoven material with a e.g. Liquid absorbent property.
  • microfiber nonwoven layer with its function of a filtration or a liquid transport.
  • the microfiber nonwoven layer is normally made relatively thin in comparison to the nonwoven thread layer serving as the carrier layer. If one wanted to increase the effectiveness of the filtration of the microfiber nonwoven layer, it would be necessary to make the thin filtration layer very dense, but this would lead to the disadvantage that the filtration speed is reduced. With regard to the functions intended for the individual components of the composite nonwoven material, there are limits.
  • Document EP-A-296 279 discloses a nonwoven absorbent body which is formed from so-called staple fibers.
  • the absorbent body consists, on the one hand, of thermoplastic continuous filaments distributed in scattering texture and, on the other hand, of short fibers and optionally swelling particles which are embedded in the continuous filaments distributed by scattering texture.
  • the inner filament should be held together by the continuous filaments.
  • the known absorbent body is produced by pulling continuous filaments out of a spinneret and then stretching them.
  • the endless filaments open into a shaft, which in its lower third comprises a mixing area, to which the short fibers and optionally also swelling particles are fed from a grinder.
  • the endless filaments as well as the short fibers from the grinder meet an endless sieve belt on which they are deposited.
  • the short fibers are deliberately given very small dimensions of 1 - 50 mm in length. The use of longer lengths is ruled out in the known absorbent body because, due to the aerodynamic conditions, because of the air streams adhering to the filaments, it is not possible to mix them with one another in the mixing zone in a mixing area above the depositing belt.
  • the invention is based on the preamble of claim 1 of other requirements. Not only are the first component, the coarse filaments, endless filaments, but the second component, namely the very long microfibers with relatively small diameters, is practically formed by endless filaments. Because the fine microfibers with the small diameters are very long, they can be considered practically endless in relation to their diameters. In contrast to the known suction body, a grinder is also eliminated in the invention in order to produce short fibers.
  • the invention has for its object to provide an improved composite nonwoven material which has an increased efficiency with regard to the functions adhering to the individual components.
  • the invention looks in a surprising and novel way proposes to form the composite nonwoven material by a mixture of coarse, endless filaments and fine, very long microfibers, without creating discrete layers with a phase boundary.
  • the composite nonwoven material is rather formed on a laying device by simultaneous blowing of both components, so that the composite nonwoven material formed does not have discrete, delimited layers, but consists of a more or less uniform mixture of the coarse filaments and the fine microfibers.
  • microfibers are mixed with the coarse filaments without prior intermediate consolidation, i.e. a discrete and pre-consolidated microfiber layer as in the prior art is not even provided.
  • the invention therefore creates a composite nonwoven material composed of at least two fibrous components (continuous filaments and microfibers), the individual layers not being defined discretely and no phase boundaries being present, however, because the new composite nonwoven material is an integrated material.
  • a method for producing a random fiber nonwoven web which consists of a mixture of different fibers, but these fibers are very short.
  • the fibers are broken down into individual fibers by two licker-in and guided convergingly into a mixing zone by separate air streams with high flow velocity.
  • the individual fibers cross and penetrate one another, and then the mixed fibers are deposited on an air-permeable surface within a limited area to form a random fiber fleece.
  • the short fibers are therefore first mixed in a mixing zone and only then is the random fiber fleece formed by placing it on an air-permeable base.
  • short fibers means that the length of these fibers is less than 6.4 mm.
  • the length of the fine microfibers in the invention is several powers of ten greater than the "long fibers" used in the prior art.
  • the different fibers in the invention are not broken down into individual fibers by licker-in and then mixed with one another in a mixing zone before the actual placement.
  • the pioneers would turn the endless fibers back into short fibers, which leads away from the invention.
  • An essential feature of the invention is that due to the mixture of the different components formed, there is hardly a gradient across the cross section with regard to the different fiber diameters. Nevertheless, the new composite nonwoven material provides a summary of the two functions inherent in the different fiber components. However, it should be pointed out that due to the mixing of the two components over the cross section of the composite nonwoven material, the respective functions can now also extend over the thickness of the entire cross section.
  • microfibers The function of the microfibers is essentially distributed over the entire cross-section of the composite nonwoven material, as is the carrier function of the relatively coarse filaments. Given the mixing of the individual components, the respective functions of these components can be realized considerably better because, in contrast to the prior art, there are no layer-like phase boundaries of the individual components.
  • the new composite nonwoven material covers the entire cross-section of the composite nonwoven material a certain homogeneity of the respective functions is given, whereas the functions adhering to the individual components are limited in the prior art to the individual layers as such.
  • the individual components are mixed with one another over the cross section, the individual components can now also perform the functions assigned to them over a much greater layer thickness.
  • a function is, for example, the filtration or liquid transport of liquids. Because of the distribution of the microfibers achieved as a result of the intermixing, a higher filtration rate can be achieved over the entire layer thickness of the composite nonwoven material.
  • the invention has a further advantage.
  • a certain pre-consolidation of the composite nonwoven material can already be achieved in the integrated nonwoven formation process provided in an expedient embodiment of the invention on the same catch belt of a nonwoven spinning system.
  • Composite nonwoven material 10 consists of a mixture of coarse filaments 12 and fine microfibers 14.
  • the coarse filaments 12 are indicated in the drawing by solid hatching lines and the fine microfibers 14 by hatching lines drawn in broken lines. Both the coarse molecularly oriented and essentially endless filaments 12 and the essentially hardly molecularly oriented discontinuous fine microfibers 14 thus extend essentially over the entire thickness of the cross section of the composite nonwoven material 10.
  • the filaments 12 serve as a carrier layer, and the function of a filtration is assigned to the microfibers 14.
  • the filtration layer thus formed in the form of the microfibers 14 is thus distributed over the entire thickness of the cross section, as a result of which a higher filtration rate can be achieved in comparison with thin, discrete filtration layers. Also the
  • the carrier function of the filaments 12 extends over the entire width of the cross section of the composite nonwoven material 10.
  • the composite nonwoven material 10 is produced in an integrated nonwoven formation process on the same laying device of a nonwoven spinning system, not shown.
  • the filaments 12 and the microfibers 14 are laid down to form a flat structure without the formation of layer-like discrete phase boundaries.
  • the filaments 12 and the microfibers 14 are mixed together, as a result of which a mixture is formed.
  • the mostly short and very fine microfibers 14 largely fill the spaces between the comparatively coarse filaments 12, as a result of which the composite nonwoven material already has a certain strengthening.
  • the mixture of the composite nonwoven material 10 is otherwise formed without the individual components - filaments 12 or microfibers 14 - having undergone intermediate consolidation beforehand.
  • the diameters of the coarse filaments 12 are on the order of magnitude of greater than 15 ⁇ m, while the diameters of the substantially finer microfibers 14 have values of less than 10 ⁇ m.
  • the endless molecular-oriented filaments 12, which form the supporting matrix of the composite nonwoven material 10, can be a conventional spunbonded nonwoven material.
  • the essentially discontinuous microfibers 14 can be produced in an advantageous manner by the so-called melt-blown process.
  • the invention is not limited to the exemplary embodiment shown with two components; composite nonwoven materials with several components can also be produced as a mixture.
  • the area of application of the new composite nonwoven material is very diverse depending on the selection of the components used and is primarily in the field of medicine and the clothing industry.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Multicomponent Fibers (AREA)
  • Filtering Materials (AREA)
  • Materials For Medical Uses (AREA)
EP90110183A 1989-06-20 1990-05-29 Verbundvliesmaterial Expired - Lifetime EP0403840B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90110183T ATE100506T1 (de) 1989-06-20 1990-05-29 Verbundvliesmaterial.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3920066A DE3920066A1 (de) 1989-06-20 1989-06-20 Verbundvliesmaterial
DE3920066 1989-06-20

Publications (2)

Publication Number Publication Date
EP0403840A1 EP0403840A1 (de) 1990-12-27
EP0403840B1 true EP0403840B1 (de) 1994-01-19

Family

ID=6383098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90110183A Expired - Lifetime EP0403840B1 (de) 1989-06-20 1990-05-29 Verbundvliesmaterial

Country Status (5)

Country Link
EP (1) EP0403840B1 (enrdf_load_stackoverflow)
JP (1) JPH0327166A (enrdf_load_stackoverflow)
AT (1) ATE100506T1 (enrdf_load_stackoverflow)
DE (2) DE3920066A1 (enrdf_load_stackoverflow)
ES (1) ES2050877T3 (enrdf_load_stackoverflow)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5685757A (en) * 1989-06-20 1997-11-11 Corovin Gmbh Fibrous spun-bonded non-woven composite
ATE107977T1 (de) * 1990-12-27 1994-07-15 Corovin Gmbh Abdeckvlies.
DE4108937C2 (de) * 1990-12-27 1994-09-22 Corovin Gmbh Abdeckvlies
DE4114839C2 (de) * 1991-05-07 1996-02-29 Corovin Gmbh Verbundvliesmaterial
DE9320208U1 (de) * 1993-12-31 1994-03-31 Kalthoff Luftfilter und Filtermedien GmbH, 59379 Selm Mehrschichtiges Filtermaterial
CA2129210A1 (en) * 1994-03-31 1995-10-01 Debra Jean Mcdowall Liquid distribution layer for absorbent articles
DE19630523C1 (de) * 1996-07-29 1998-03-12 Freudenberg Carl Fa Spinnvliesstoff und Vorrichtung zu dessen Herstellung
US5965468A (en) * 1997-10-31 1999-10-12 Kimberly-Clark Worldwide, Inc. Direct formed, mixed fiber size nonwoven fabrics
DE19953717C2 (de) * 1999-11-09 2002-01-17 Sandler C H Gmbh Fasermatte
EP1424412A1 (de) * 2002-11-27 2004-06-02 Polyfelt Gesellschaft m.b.H. Spinnplatte
DE10314552A1 (de) * 2003-03-31 2004-10-14 Rieter Automatik Gmbh Verfahren und Vorrichtung zur Herstellung eines Verbundvlieses
US9175428B2 (en) 2012-04-30 2015-11-03 Chen-Cheng Huang Method of making a double-sided embossed non-woven fabric

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768118A (en) * 1971-01-21 1973-10-30 Johnson & Johnson Web forming process
GB1453447A (en) * 1972-09-06 1976-10-20 Kimberly Clark Co Nonwoven thermoplastic fabric
JPS62215057A (ja) * 1986-03-04 1987-09-21 チッソ株式会社 補強不織布
DE3720031A1 (de) * 1987-06-16 1989-01-05 Freudenberg Carl Fa Saugkoerper aus vliesstoff und verfahren zu seiner herstellung

Also Published As

Publication number Publication date
DE3920066C2 (enrdf_load_stackoverflow) 1991-05-08
DE3920066A1 (de) 1991-01-10
EP0403840A1 (de) 1990-12-27
ES2050877T3 (es) 1994-06-01
JPH0327166A (ja) 1991-02-05
ATE100506T1 (de) 1994-02-15
DE59004282D1 (de) 1994-03-03

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