Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
  • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
  • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
  • A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
  • A61F13/53708—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer the layer having a promotional function on liquid propagation in at least one direction
  • A61F13/53713—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer the layer having a promotional function on liquid propagation in at least one direction the layer having a promotional function on liquid propagation in the vertical direction
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
  • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
  • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
  • A61F13/5116—Topsheet, i.e. the permeable cover or layer facing the skin being formed of multiple layers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
  • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
  • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
  • A61F13/512—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its apertures, e.g. perforations
  • A61F13/5123—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its apertures, e.g. perforations the apertures being formed on a multilayer top sheet
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
  • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
  • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
  • A61F13/513—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability
  • A61F13/51305—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability having areas of different permeability
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
  • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
  • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
  • A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
  • A61F13/53743—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers
  • A61F13/53747—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers the layer is facing the topsheet
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
  • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
  • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
  • A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
  • A61F2013/53765—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterized by its geometry
  • A61F2013/53782—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterized by its geometry with holes

Definitions

• Nonwoven material in particular composite material
• the invention relates to a nonwoven material, in particular a composite nonwoven material with at least two layers according to the preamble of claim 1.
• Such nonwoven materials are produced according to the known spunbonded nonwoven processes and are used to transport liquid in only one direction from the outside inwards, with a storage body or an absorbent body being located on the inside which absorbs and stores the liquid transported through the nonwoven material.
• a preferred use of such a nonwoven material is given in diapers for children or also in incontinent diapers for adults.
• diapers comprise an absorbent body which is coated on one side with a polymer film to prevent the escape of the liquid stored in the absorbent body.
• the absorbent body On its other inner use side, the absorbent body is covered with the nonwoven material made of synthetic fibers, which serves here as a covering nonwoven and which is intrinsically hydrophobic.
• the fleece material i.e. the covering fleece, appears dry even when the absorbent body in a diaper is soaked with urine.
• the hydrophobic covering fleece with suitable wetting agents, as is described, for example, in German specification 27 22 860.
• a wetting agent ie by hydrophilizing the nonwoven material
• the previously hydrophobic covering nonwoven is now permeable to water.
• the application of the wetting agent must be controlled in a certain way. Too much application accelerates the transport of the urine to the absorbent body, but there is then the danger that the urine stored in the absorbent body can also be transported back outwards, thereby reducing the feeling of dryness.
• the hydrophilization of the non-woven material which is hydrophobic per se, does not pose any difficulty, but in practice the comfort of the non-woven material thus prepared leaves something to be desired.
• the invention is based on the object of providing a nonwoven material of the type assumed, which enables improved liquid transport in a preferred direction and at the same time undesired return transport of the liquid prevented.
• the invention achieves this aim in the nonwoven material mentioned in the preamble of claim 1 by the features of the characterizing part of claim 1.
• the invention surprisingly describes the way of using the nonwoven material only on a large number of discrete, from one another separate hydrophilized areas to be water-permeable. A pattern with discrete areas is generated on the nonwoven material, so to speak, only these discrete areas being water-permeable, while the remaining surface area of the nonwoven material remains hydrophobic.
• the invention is based on the knowledge that with a nonwoven material that has been hydrophilized over the entire surface, there is a risk that the liquid stored in the storage body can be transported back through the nonwoven material if the storage body is a Has absorbed maximum of liquid and soaked up.
• this disadvantage can be largely avoided in the embodiment of the nonwoven material according to the invention with a large number of discrete hydrophilized and water-permeable points. Due to the many hydrophilized areas of the nonwoven material, it occurs when the nonwoven material is covered with urine is already a distribution of the liquid on the nonwoven material, with the result that the penetration or the liquid transport occurs only at the discrete locations and not over the entire surface. As has been shown in experiments, this surprisingly results in a substantially increased suction capacity and also an increased absorption speed for the liquid.
• Another advantage is that due to the targeted liquid transport at discrete locations, the absorbent body is also supplied with liquid only at discrete locations, and that the absorbent body is capable of being supplied to it at discrete locations due to its suction effect It is better to distribute liquid over its entire cross-sectional content. The risk of the nonwoven material feeling damp, which the user of a diaper feels as uncomfortable, is thus largely eliminated.
• the hydrophilized, water-permeable points can be formed in a dot or circular shape, rectangular or even in a strip shape.
• the nonwoven material does not cover the entire surface, but is designed to be permeable to water only at discrete, spatially separated locations.
• the nonwoven material is formed in two layers with an upper outer layer made of relatively coarse fibers (coarse layer) and a lower inner layer (fine layer) facing the absorbent body with finer fibers.
• a fiber diameter gradient is thereby formed over the cross section of this two-layer nonwoven material with regard to the diameter of the fibers of the individual layers.
• this fiber diameter gradient ensures a directed liquid transport in the direction from the outer layer downward over the inner layer to the absorbent body, because the liquid storage capacity and the transport speed of the coarse outer layer are lower than that of the inner fine layer.
• the disadvantageous return transport of the liquid from the absorbent body to the outside is avoided in the invention, this is due to the novel design of the nonwoven material.
• ren which is not hydrophilized over the entire surface, but only at a large number of discrete points.
• the return transport is thereby limited to an overall smaller surface level than if - as is provided in the known nonwoven material - the entire surface of the nonwoven material is hydrophilized.
• the upper outer layer can be regarded as a spacer, since the outer layer is only suitable to a limited extent for storing liquid because of its coarse structure.
• the configuration of the nonwoven material according to claim 1 thus fulfills the function of distributing the liquid and ensures that the liquid is rapidly penetrated to the absorbent body.
• the multiplicity of discrete, hydrophilized, water-permeable points is not distributed over the entire surface of the nonwoven material, but rather is only provided within a surface area forming a window, while the area outside the window remains hydrophobic.
• This configuration of the nonwoven material enables even better targeted control of the wetting agent application and the liquid transport at desired areas.
• the covering fleece is only provided with the window with the discrete hydrophilized areas between about 6 and 50%. It is assumed that in practice - in particular in the case of diapers - the liquid does not appear on the entire outer surface, but only in some areas and has to be transported to the absorbent body.
• this embodiment of the invention ensures that the urine emerging from the user can be sucked up in a targeted manner and can be quickly transported to the absorbent body in the region of the part provided with the hydrophilized points.
• the selected area which specifies the area with the discrete hydrophilized areas, can preferably be provided in the form of a strip in the middle of a disposable diaper. In any case, it is sufficient if a strip is equipped with the hydrophilized areas in the middle of the step in the folded diaper. In the case of a profiled diaper, a width which corresponds to that of the narrow web is sufficient.
• the discrete water-permeable points are produced by printing on the nonwoven material with a wetting agent. In this way, the discrete points can be implemented in a method-simple manner. It is also possible to produce the discrete water-permeable points by intermittently spraying the nonwoven material with a wetting agent. In another expedient embodiment of the invention, the discrete water-permeable points are formed by holes made in the nonwoven material, the holes being wetted on their outer edges with a wetting agent.
• This type of producing the discrete, water-permeable points can be carried out in a simple manner with a spiked roller which is provided with spikes on its circumference and is known per se for other purposes.
• the fleece material is guided over the spiked roller, the spikes of which then produce the holes, preferably 5-50 holes per cm 2 being provided.
• the spikes are provided with a wetting agent so that the outer edges of the holes are then covered with the wetting agent when the holes are made in the nonwoven material.
• Fig. 1 is a plan view of a
• Diaper in which a surface area of the covering fleece is provided with a multiplicity of discrete water-permeable points
• Fig. 2 is a partial representation as
• FIG. 3 is a schematic cross-sectional view of a diaper according to FIG. 2, Fig. 4 shows a further schematic
• Fig. 5 shows another embodiment of a nonwoven material.
• FIG. 1 shows a diagrammatic view of a diaper 10 as a top view, which in a manner known per se has an absorbent body 24 (cf. FIG. 3), which is also on its rear side in a manner known and not shown here is surrounded with a water-impermeable polymer film in order to prevent the liquid stored in the absorbent body 24 from escaping.
• a cover fleece 12 is provided as the fleece material.
• This cover fleece 12 is formed by hydrophobic fibers and extends over the entire surface area of the diaper 10.
• a window 14 rich Within a space formed by a window 14 rich is a plurality of discrete hydrophilized and thus water-permeable points 16 which are formed by applying a wetting agent at the respective points 16.
• these hydrophilized, water-permeable points 16 are not visible, but for better clarification of the invention, these points are shown hatched in the drawing.
• an advantageous embodiment of the invention provides that these hydrophilized areas 16 can also be made visible to the user by means of a color.
• FIG. 2 illustrates an embodiment in which the hydrophilized points 16 are formed by a large number of holes, preferably 5-50 holes per cm 2 .
• the cover nonwoven 12 has a two-layer structure with a coarse outer layer 18 and an inner fine layer or inner layer 20.
• the cover nonwoven 12 is here designed as a composite nonwoven material with two layers.
• the holes 26 shown are provided on their outer edges 28 with a wetting agent.
• the outer layer 18 here consists of continuous fibers with an average diameter of 10-30 ⁇ m.
• the inner layer here also consists of continuous fibers with an average diameter of 4 to 10 ⁇ m.
• the inner layer can also be formed by short finite fibers with an average diameter of 1-5 ⁇ m.
• the outer layer 18 and the inner layer 20 are separated from one another by a functional boundary 22 shown as a broken line.
• a fiber diameter gradient is formed over the entire cross-section of the cover fleece 12, which enables a liquid to be transported in the direction of the absorbent body 24.
• FIG. 3 an area with water 30 is shown in FIG. 3 on the upper outer layer 18.
• the liquid supply of the water 30 on the surface of the cover fleece 12 is distributed over the holes 26 in the manner illustrated by the arrows.
• FIG. 4 shows a schematic cross-sectional view the two-layer cover fleece 12 with the outer layer 18 and the inner layer 20, which are connected to one another in a manner known per se at the fastening points 34 by thermal welding.
• the functional limit 22 can be seen.
• holes 26 can be produced, for example, with a spiked roller (not shown here) provided with spikes on its outer circumference.
• the diameter of the holes is so small at 0.2-2 mm that the holes 26 as such are not necessarily visible in the upper coarse outer layer, while they actually penetrate the lower fine layer or inner layer 20 because of the finer structure .
• FIG. 5 schematically shows a cross-sectional view of a two-layer cover fleece with an outer layer 18 and an inner layer 20, which is not shown here. provided suction body is facing.
• the entire surface of the cover fleece 12 is here hydrophilized and thus made water-permeable overall, while only the lower inner layer 20 is hydrophilized at a number of discrete locations 16, for example through the holes 26 already mentioned.
• the upper outer layer 18 is designed to be water-permeable over the entire surface, the advantages sought by the invention can also be achieved here because of the lower layer which is hydrophilized only at discrete points.

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• Health & Medical Sciences (AREA)
• Epidemiology (AREA)
• Engineering & Computer Science (AREA)
• Biomedical Technology (AREA)
• Heart & Thoracic Surgery (AREA)
• Vascular Medicine (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Absorbent Articles And Supports Therefor (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6381795

Family Applications (1)

Country Status (2)

Cited By (12)

Families Citing this family (13)

Citations (5)

Family Cites Families (2)

• 1989
  • 1989-06-01 DE DE3917791A patent/DE3917791A1/de active Granted
• 1990
  • 1990-05-29 WO PCT/DE1990/000413 patent/WO1990014813A1/de unknown

Patent Citations (5)

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