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WO1999055266A1 - Couche contenant un element d'absorption lavable - Google Patents

Couche contenant un element d'absorption lavable Download PDF

Info

Publication number
WO1999055266A1
WO1999055266A1 PCT/NL1999/000253 NL9900253W WO9955266A1 WO 1999055266 A1 WO1999055266 A1 WO 1999055266A1 NL 9900253 W NL9900253 W NL 9900253W WO 9955266 A1 WO9955266 A1 WO 9955266A1
Authority
WO
WIPO (PCT)
Prior art keywords
absorption element
liquid
perforations
synthetic fibres
absorption
Prior art date
Application number
PCT/NL1999/000253
Other languages
English (en)
Inventor
Gregorius Maria Hubertus Goyarts
Original Assignee
Goyarts B.V.
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
Application filed by Goyarts B.V. filed Critical Goyarts B.V.
Priority to CA002330592A priority Critical patent/CA2330592A1/fr
Priority to AU35401/99A priority patent/AU3540199A/en
Publication of WO1999055266A1 publication Critical patent/WO1999055266A1/fr

Links

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
    • A61F13/505—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators with separable parts, e.g. combination of disposable and reusable parts
    • 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
    • A61F13/45—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 shape
    • A61F13/49—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 shape specially adapted to be worn around the waist, e.g. diapers, nappies
    • A61F13/49003—Reusable, washable fabric diapers
    • A61F13/49004—Reusable, washable fabric diapers with fastening means

Definitions

  • the invention relates to a washable absorption element which is suitable for reuse and which, seen in its vertical extent, comprises at least one liquid-absorbent layer which comprises a mixture of chemical and synthetic fibres and which, on its top and bottom side, is bonded to one or more liquid-transporting layers made of non woven material, which substantially comprise synthetic fibres.
  • Such a washable absorption element is disclosed by WO 97/34554 issued to the applicant.
  • This publication describes an absorption element of the specified type, wherein the liquid-absorbent layer comprises a mixture of chemical and synthetic fibres such as viscose or polyester, and where the liquid-transporting layers consist of nonwoven material which substantially comprises synthetic fibres such as polyester.
  • the absorption element contains less than 100%, e.g. from 90 to 10% of chemical fibres such as viscose, and additional material to make up 100%, e.g. from 10 to 90% of synthetic fibres such as polyester.
  • chemical fibres such as viscose
  • additional material to make up 100% e.g. from 10 to 90% of synthetic fibres such as polyester.
  • the level of chemical fibres such as viscose is from 80 to 20%, whilst the proportion of synthetic fibres such as polyester takes up from 20 to 80%.
  • the chemical fibres fraction preferably comprises fibres having a thickness of from 1 to 8 dTex and a length of from 30 to 100 mm, whilst the synthetic fibres fraction in the absorbing layer comprises fibres having a thickness of from 1 to 10 dTex and a length of from 30 to 100 mm.
  • the synthetic fibres such as polyester in the liquid-absorbent layer can additionally comprise polyester having a thickness of less tha 1 dTex and a length of from 30 to 80 mm.
  • the liquid-absorbent layer of the absorption element comprises from 60 to 90% of chemical - 2 - fibres such as viscose and from 40 to 10% of synthetic fibres such as polyester, and preferably from 75 to 85% of viscose and from 25 to 15% of polyester.
  • synthetic fibres and polyester may also consist of polyamide, polyacrylic, polyethylene and polypropylene or modified forms thereof, or of mixtures of two or more of such fibres .
  • Very good results are also obtained with polypropylene fibres in the quantities, thicknesses and lengths specified above with respect to polyester.
  • the chemical fibre preferably comprises viscose which may or may not be modified.
  • the absorption element outlined in the above provides excellent results and said element also exhibits excellent washability, rapidly releasing the contaminating matter which is absorbed, the drying rate of the absorption element after washing for the purpose of reuse is still open to improvement .
  • the invention to this end being characterized in that the absorption element is provided with a large number of perforations which extend at least over part of the vertical extent of the absorption element .
  • the perforations are arranged in a regular pattern.
  • Said pattern can take a large variety of forms, such as a triangular, quadrangular or hexagonal pattern; a quadrangular pattern is quite satisfactory.
  • the pattern of holes can also be positioned on a - 3 - family of regularly arranged lines which may or may not be curved, such as a family of straight lines, sawtooth lines, sinusoidal lines and the like.
  • the perforations can be introduced in many ways, for example by the use of heated steel pins; hollow tubes which may or may not be heated; water jet perforation, laser perforation and many other ways which will be evident to those skilled in the art.
  • the perforations will generally have a diameter of from 1 to 5 mm and a centre- to-centre spacing of from 8 to 30 mm. In a preferred embodiment, the perforations have a diameter of about 3 mm and a centre-to-centre spacing of about 12 mm.
  • the shape of the perforations can also be square, triangular, oval, star-shaped or the like, whilst combinations of shapes can also be present .
  • the absorption element outlined above has liquid- transporting layers on both sides in the form of a layer made of nonwoven material which substantially comprises synthetic monofilaments . Because of the mechanical stresses to be expected in the washing treatment it is advantageous for the absorption element to be covered on at least one side by a liquid-permeable covering layer of synthetic fibres, said liquid-permeable covering layer of synthetic fibres having a knitted or woven structure, on the grounds of mechanical strength.
  • the synthetic fibres of the liquid-permeable covering layer can be the synthetic fibres as mentioned hereinabove, i.e. polyester, polyamide, polyacrylic, polypropylene, polyethylene, good utility being ensured by polyester and polypropylene .
  • the novel absorption element described here which is provided with perforations to improve the drying rate, comprises, on at least one side of the absorption element, - 4 - a spacing structure made of synthetic onofilaments, said spacing structure being disposed between the surface of the absorption element and the liquid-permeable covering layer. If a spacing structure is present only on one side of the absorption element, said spacing structure will preferably be positioned on that side of the absorption element which is closest to the body of the user.
  • the spacing structure may or may not be permanently joined to the absorption element .
  • the needling of two sides of the absorption element has taken place, said needling being able to take place, if desired, simultaneously from two sides of the absorption element.
  • the liquid-absorbent layer of the absorption element generally has a thickness of between 0.5 and 25 mm, and the liquid- transporting layers generally have a thickness of between 0.25 and 10 mm.
  • the absorption element material can be subjected to a thermofixation treatment, for example at a temperature of at most 185°C, to reduce shrinking of the element in use.
  • WO 97/34554 which is incorporated herein by reference .
  • the above-described spacing structure which may form part of the absorption element will, if joining of the spacing structure and the absorption element has taken place, likewise optionally be joined to the absorption element with the aid of needling techniques.
  • the fastening method is, however, not limited thereto; equally conceivable are local fusing of the spacing structure with - 5 - the absorption element or local gluing together thereof.
  • the spacing structure expediently is a knitted material made of synthetic filaments, the materials capable of being used being those specified previously; preferably, the structure is a knitted polyester material.
  • the invention also relates to an application composition, such as trainer pants or a pad, which comprises a liquid-impermeable synthetic material and an absorption element, said application composition being characterized in that it comprises an absorption element according to the invention as described hereinabove and preferably an absorption element which on at least one side is covered by a liquid-permeable covering layer made of synthetic fibres, on at least one side a spacing structure optionally also being present.
  • the application composition is not restricted to a trainer pants or pad; application is also possible in the packaging industry, furniture industry, automotive industry, agricultural and horticultural bonded fibre webs, bonded fibre webs for roofing, insulation materials, drainage media, filter materials, fume cupboards, fire blankets, absorption blankets, clothing such as sports clothing and sports accessories, also workwear, protective material against, for example, oil (in this case a laminated film can be applied to the absorption element) , horse blankets, saddlecloths, absorption material for animal cages and the like, such as, for example, cat litter, cleaning articles, incontinence and decubitus materials, mattress covers, bandaging materials, and blankets to play on and to be used in playpens, for children.
  • oil in this case a laminated film can be applied to the absorption element
  • horse blankets, saddlecloths, absorption material for animal cages and the like such as, for example, cat litter, cleaning articles, incontinence and decubitus materials, mattress covers, bandaging materials, and blankets to play on
  • the absorption element in the application composition according to the invention on the side which will come into contact with the body of the user, comprises a liquid-permeable covering layer of synthetic fibres, which covering layer projects beyond the absorption element and is joined to the liquid- impermeable material of the application composition.
  • the covering layer made of synthetic fibres being - 6 - joined to the liquid-impermeable material of the application composition such as trainer pants or a pad, an application composition comprising an absorption element is obtained, which forms a whole and which can as such be subjected to a washing operation for reuse.
  • the liquid-permeable covering layer made of synthetic fibres is generally of such fineness that liquids can pass through, but solid particles of, for example, faeces cannot, so that an accumulation of solids within the absorption element or within the liquid-permeable covering layer and the liquid-impermeable material is substantially prevented.
  • a spacing structure made of synthetic fibres is present on both sides of the absorption element.
  • Figure 1 shows a transverse section of a perforated absorption element according to the invention
  • Figure 2 shows an absorption element as in Figure 1, which is surrounded by liquid-permeable covering layers;
  • Figure 3 shows the principle of the way in which the various layers of the absorption element are joined to one another
  • Figure 4 schematically shows trainer pants with an absorption element incorporated therein.
  • Figure 5 shows a schematic transverse section of the trainer pants according to Figure 4 with an absorption element permanently incorporated therein.
  • an absorption element according to the invention is indicated by 1 and comprises a liquid- absorbent layer 2 and on both sides thereof liquid- transporting layers 3 and 4.
  • the absorption element is provided with perforations 9 to improve the washing and drying rate for the purpose of reuse.
  • the liquid-absorbent - 7 - layer comprises from 50 to 80% of viscose and from 20 to 50% of polypropylene, from 0.01 to 40% of the polypropylene optionally being polypropylene with fibres of a thickness of 1 dTex.
  • the standard polypropylene fibres have an average thickness of 7 dTex and an average length of 60 mm, whereas the viscose fibres have an average thickness of 3 dTex and a length of 60 mm.
  • the liquid-transporting layers 3 and 4 substantially comprise polypropylene, a fraction of which, from 0.01 to 40%, being polypropylene of a thickness of about 1 dTex.
  • the polypropylene fibres have an average thickness of 7 dTex and a length of 60 mm.
  • the abovementioned synthetic fibres may also comprise polyester, with the same beneficial impact on the accelerated drying effect.
  • the perforations 9, in this specific case, have a diameter of about 3 mm, whilst the centre-to-centre spacing is about 12 mm. Other values for the diameter or the centre-to-centre spacing can lie within the ranges specified hereinabove in connection with the claims.
  • the perforations 9, in the absorption element 1, extend across the entire vertical extent of the absorption element .
  • the absorption element in Figure 1 is drawn as a three-layer element having layers 2, 3 and 4. Also within the scope of the invention, however, are elements having four, five or more layers, although preferably care will be taken to ensure in such an arrangement that at least the top and bottom layer of the element are liquid-transporting layers which substantially consist of synthetic fibres.
  • perforations can be introduced over the entire vertical extent of the absorption element or over part of the vertical extent of the absorption element. If the perforations are introduced over part of the vertical extent of the absorption element, expediently at least part of the liquid-absorbent layer or layers will be provided with perforations. - 8 -
  • FIG 2 shows the absorption element according to Figure 1, which is enclosed between a covering of liquid- permeable material in the form of covering layers 6 and 7, which are joined together at 8 to form a sealed envelope within which the absorption element is accommodated.
  • Joining the layers 6 and 7 can be effected by welding, gluing, stitching etc.
  • the liquid-permeable covering layers 6 and 7 are expediently made from polyester, the material having a knitted or woven structure to improve the mechanical strength and preferably having a knitted structure.
  • the polyester substrate has been knitted, roughened and then cropped, in order to impart to the material a very soft character which, moreover, readily releases solids from faeces.
  • Figure 3 schematically shows how the various layers, for example the viscose- and polypropylene- containing layer 2 and the polypropylene-containing layer 3 are joined together.
  • the interpenetration of fibres from the layers 2 and 3 is effected by a needle treatment in which needles penetrate via one layer as far as into the second layer and on the return stroke pull along fibres from the second layer until these extend into the first layer.
  • This needling or needle treatment can take place from one side of the absorption element but may also be carried out from two sides, possibly simultaneously.
  • FIG. 4 diagrammatically shows trainer pants with an absorption element according to the invention incor- porated therein.
  • the trainer pants 10 consist of a liquid- impermeable material such as, for example, polyurethane , whilst a liquid-absorbing element of the type as described in Figure 2 is incorporated in the trainer pants .
  • the trainer pants as customary, have closure means 13 which expediently comprise a velcro strip material, and customary leakage prevention edges 11.
  • 12 indicates a piece of elastic which is fitted at the rear of the trainer pants and which ensures that the trainer pants 19 with the absorption element 5 present are more comfortable to wear.
  • the absorption element can be inserted as a removable element; alternatively, however, absorption element 5 can be permanently joined to the trainer pants, as shown in Figure 5.
  • Figure 5 schematically shows an absorption element 20 with liquid-transporting layers 23 and 24 and a liquid-absorbing layer 30.
  • the absorption element comprises perforations 25 of the type described previously, which run through the absorption element over its entire vertical extent.
  • the absorption element is surrounded on both sides by spacing structures 26 and 27 which, for example, consist of a knitted material or woven material made of polyester or polyamide and which reduce the risk of decubitus when used as a nappy or incontinence material .
  • the spacing structures further contribute to an improved washing/drying time; provide better absorption distribution, contribute to softer handle of the entire composition and potentially serve as an additional moisture storage space .
  • polyester or polyamide is a convenient material for the spacing structures, other synthetic fibres of moisture-permeable character can likewise be used.
  • the moisture-impermeable material which forms part of the trainer pants or pad is indicated by 31; this material can be polyurethane, for example.
  • 28 indicates a liquid-permeable covering layer of synthetic fibres such as polypropylene, the liquid-permeable covering layer being joined, at 29, to the liquid-impermeable material 31, welding, gluing or stitching or the like being suitable options.
  • composition thus obtained of liquid- impermeable material 31, an absorption element 20 having perforations 25, and a liquid-permeable covering layer 28 made of synthetic material form a contextural whole which, when washed for purposes of reuse, retains its contexture.
  • Trials have indicated that the drying time of such a composition in a typical case is from 0.5 to 0.75 hour for a composition in which an absorption element according to the invention having perforations is used, whereas the same composition, which contains an absorption element without perforations, under the same conditions required a drying time after washing for the purpose of reuse of from - 10 -

Landscapes

  • 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)
  • Orthopedics, Nursing, And Contraception (AREA)

Abstract

L'invention concerne un élément d'absorption constitué d'une couche (2) d'absorption de liquide et de couches (3 et 4) de transport de liquide dans lesquelles, selon l'invention, un grand nombre de perforations (9) sont formées. Du fait de la présence des perforations (9), le temps de séchage de l'élément d'absorption (1) est considérablement diminué. L'invention concerne également une composition d'application telle que des culottes de propreté ou une garniture, contenant au moins un élément d'absorption perforé (5, 20), selon l'invention, pouvant y être joint de façon permanente.
PCT/NL1999/000253 1998-04-29 1999-04-28 Couche contenant un element d'absorption lavable WO1999055266A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA002330592A CA2330592A1 (fr) 1998-04-29 1999-04-28 Couche contenant un element d'absorption lavable
AU35401/99A AU3540199A (en) 1998-04-29 1999-04-28 Diaper containing a washable absorption element

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1009034A NL1009034C2 (nl) 1998-04-29 1998-04-29 Wasbaar absorptie-element en toepassingssamenstel dat een dergelijk element bevat.
NL1009034 1998-04-29

Publications (1)

Publication Number Publication Date
WO1999055266A1 true WO1999055266A1 (fr) 1999-11-04

Family

ID=19767051

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1999/000253 WO1999055266A1 (fr) 1998-04-29 1999-04-28 Couche contenant un element d'absorption lavable

Country Status (4)

Country Link
AU (1) AU3540199A (fr)
CA (1) CA2330592A1 (fr)
NL (1) NL1009034C2 (fr)
WO (1) WO1999055266A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1012368C2 (nl) 1999-06-16 2000-12-19 Goyarts B V Wasbare onderlegger en werkwijze voor het vervaardigen daarvan.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717150A (en) * 1970-09-09 1973-02-20 Farah Mfg Co Inc Absorbent stretchable fabric
WO1997034554A1 (fr) 1996-03-20 1997-09-25 Goyarts B.V. Element absorbant lavable et reutilisable, procede de fabrication et couches comportant cet element

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717150A (en) * 1970-09-09 1973-02-20 Farah Mfg Co Inc Absorbent stretchable fabric
WO1997034554A1 (fr) 1996-03-20 1997-09-25 Goyarts B.V. Element absorbant lavable et reutilisable, procede de fabrication et couches comportant cet element

Also Published As

Publication number Publication date
AU3540199A (en) 1999-11-16
NL1009034C2 (nl) 1999-11-01
CA2330592A1 (fr) 1999-11-04

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