EP0273454A2 - Nappe de fibres perforée - Google Patents

Nappe de fibres perforée Download PDF

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Publication number
EP0273454A2
EP0273454A2 EP87119378A EP87119378A EP0273454A2 EP 0273454 A2 EP0273454 A2 EP 0273454A2 EP 87119378 A EP87119378 A EP 87119378A EP 87119378 A EP87119378 A EP 87119378A EP 0273454 A2 EP0273454 A2 EP 0273454A2
Authority
EP
European Patent Office
Prior art keywords
openings
fibers
nonwoven fabric
areas
area
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.)
Granted
Application number
EP87119378A
Other languages
German (de)
English (en)
Other versions
EP0273454A3 (en
EP0273454B1 (fr
Inventor
Migaku Suzuki
Satoshi Nozaki
Shigeo Imai
Makoto Ishigami
Toshio Kobayashi
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.)
Unicharm Corp
Original Assignee
Unicharm Corp
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 Unicharm Corp filed Critical Unicharm Corp
Publication of EP0273454A2 publication Critical patent/EP0273454A2/fr
Publication of EP0273454A3 publication Critical patent/EP0273454A3/de
Application granted granted Critical
Publication of EP0273454B1 publication Critical patent/EP0273454B1/fr
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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/492—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet
    • D04H1/495—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet for formation of patterns, e.g. drilling or rearrangement
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture

Definitions

  • the invention relates to a nonwoven fabric in which openings are formed according to a certain pattern, in particular a nonwoven fabric with regularly distributed openings, the individual fibers being reoriented and intertwined by treating a layer of fiber material with high pressure water jets.
  • the nonwoven fabric known from U.S. Patents 28 62 251 and 32 40 657 is disadvantageous in the sense that the openings have no clear contours and the fiber areas have projections which limit the area of application of this nonwoven fabric to specific areas of application. Furthermore, the fiber density and the entanglement wheel are different at the edges of the openings and the areas defined by these edges, which results in lower tensile and tear strength, which in turn inevitably requires the addition of a suitable binder. The smoothness of the surface also leaves something to be desired.
  • One molding technique consists in placing the fiber layer on a mesh support and treating it with high-pressure water jets so that the individual fibers are pushed under the action of the water jet to the respective crossing points where the respective wire material of the support crosses.
  • the openings are formed by this pushing away, but with this technique the fibers partially protrude through the openings (meshes) of the support and also partially entangle at these crossing points.
  • these fibers are broken off when the fleece is removed from the support after the treatment has ended and they remain as lint, as a result of which the contours of the openings become blurred.
  • Another technique is to lay the fiber layer between a first pad that is apertured and has a curved inner surface and a second pad with stitches and then treat the sheet with pressurized water jets from the side of it run out most edition, so that the openings are formed by moving the fibers out of the way of the jet streams when these water jets push the fibers to the side.
  • the fibers collect and penetrate the edges of the respective openings and as a result it is obtained that the degree of fiber density and fiber entanglement predominantly improves at the edges of the openings and is approximately unchanged in the areas between the edges of the respective openings. This results in the problem already mentioned above.
  • a main object of the present invention is to provide a nonwoven fabric that has a smooth surface across the entire width of each fiber area formed between the openings, where the openings have a sharp contour to create a clear opening profile with exact distances.
  • each of the fiber areas has a substantially uniform fiber density and smooth surface, that each of the openings has an inner circumference with defined sharp contours, and that the openings are at a distance from one another of at least 1 mm.
  • the nonwoven fabric according to the invention is patterned with openings, the contours of which are considerably sharper than in the nonwovens from the prior art, the nonwoven fabric according to the invention having at the same time a uniform strength, a smooth surface and a softness over all areas and areas and a clear opening profile, so that it is superior to the prior art nonwovens in terms of touch, grip and pattern / profile properties. Accordingly, the nonwoven fabric of the invention is for a variety suitable for application areas, in particular as a surface material for absorbent sanitary articles, such as disposable diapers or sanitary napkins.
  • a nonwoven fabric 1 which is in a layer-like configuration and consists exclusively of individual fibers which are tangled together without using a binder.
  • the fleece has fiber areas 2, on the one hand, in which the individual fibers are continuously accumulated and, on the other hand, regularly distributed elliptical (or circular) openings 3, which are defined by the areas 2 and on which the fibers of the areas 2 are divided.
  • Each of the fiber areas 2 has a smooth surface and is essentially uniform in terms of its density.
  • the term “smooth" means that the area 2 has no difference in its height or thickness or an unevenness neither over the entire area nor in partial areas. With the naked eye, the openings 3 have essentially no fiber bridges or lint, which extend diametrically or transversely therein, they are therefore equipped with a clean contour.
  • the four adjacent openings assigned to a fiber region 2 are arranged in such a way that they determine a diamond shape D (see FIG. 1), in which an area 4 between each pair of openings () in the longitudinal direction (MD) and in the transverse direction (CD) of adjacent openings ( 3) extends and is larger than a region 5 which extends between a pair of obliquely adjacent openings 3, as shown in FIG. 1.
  • the fibers extend partially in an oblique direction to intersect in the larger area 4 in an X-shape, partially extending along edges of the openings 3 er stretch that are adjacent to each other in the transverse direction in the nonwoven fabric 1. More specifically, the fibers extending in the longitudinal direction of the nonwoven partially intersect in the region (regions) defined by at least two, preferably three or more openings 3 arranged in the longitudinal direction in the nonwoven; they extend along the edges of these in the width of the nonwoven fabric adjacent to openings 3, whereby these edges are defined. The fibers which extend along these edges and form them are continuous to the fibers which surround the edges of the openings 3 which are adjacent to one another in the longitudinal direction of the nonwoven fabric.
  • the density of the fibers in each of the regions 2 is essentially the same, the fibers which immediately delimit the openings 3 being distributed in a higher density and more matted together.
  • Such a uniform orientation of the fibers leads to a clear delimitation of the openings 3 and improves the strength of the nonwoven fabric 1 as a whole, wherein a dimensional stability of the openings 3 is achieved.
  • the distance between each pair of opposing openings 3, for example the width of the fiber area 2 should be at least one millimeter; if this width is less than one millimeter, this area 2 becomes cord or rope-shaped so that the nonwoven fabric no longer has a smooth surface, as is the case, for example, with the technique known from Japanese Patent Application 44-23909.
  • the spacing (pitch) of the openings 3 should be at least 2.5 mm and the diameter at least 1 mm. If these limits are undershot, it is not possible to achieve a clean contour of the opening 3; even if a clean contour were obtained, the matting of the fibers could occur during handling or use of the fiber loosen the fleece, which in turn would result in a loss of a clean contour.
  • a basis weight of the nonwoven is less than 50 g / m2, preferably less than 120 g / m2, so that openings 3 can be achieved which have a clean contour; if the weight is less than 10 g / m2, the nonwoven fabric 1 would become too thin to achieve a desired strength. The fiber density would also be too uneven to obtain openings with a sharp contour.
  • the fiber material of the nonwoven fabric 1 is also not critical and can be any that is usually used as a material for such a nonwoven fabric or a woven fabric.
  • a nonwoven fabric according to the invention which consists of a hydrophobic fiber, such as polyester or polypropylene, or a hydrophilic fiber, such as Ryan, which fibers have been given a water-repellent treatment, can, in connection with the present invention, provide the optimal surface material for absorbent sanitary articles with a high liquid permeability due to the neatly delimited openings 3, since it offers a pleasant touch due to the smooth surface as well as the softness.
  • the fiber components preferably have a length between 20 and 100 mm and a fineness of 0.5 to 15 denier.
  • the nonwoven fabric obtained in this way according to the invention can be used for a large number of areas of application, for example as material for clothing, decorative or covering materials for various areas of application, including furniture, surface material for interior fittings, for walls and filter material, the nonwoven material being used for applications with a binder or other materials, as well as material for absorbent sanitary articles, such as disposable diapers and sanitary napkins.
  • the nonwoven fabric according to the invention can be produced using the method described below.
  • a layer of fiber material preferably a non-woven fabric 11 is supplied by a carding machine in which the individual fibers are confused and matted under the action of high-pressure water jets and is exposed to a curtain-like water jet from a container 12 in order to create inner layers To reduce fiber gaps and to prevent the fibers from becoming fluffy or fluffy and at the same time to achieve a desired dimensional stability.
  • the fleece is then fed to a support cylinder 15 on which a multiplicity of projections 13 are distributed at predetermined intervals, preferably at least at a mutual distance of at least 1 mm and in the aforementioned diamond pattern. Furthermore, a plurality of small drainage holes 14 are provided between the protrusions.
  • Suction means 16 are formed in the cylinder 15, which ensure drainage through the drainage bores 14.
  • a nozzle arrangement 17 with a plurality of nozzles each having a predetermined diameter and a predetermined distance in the transverse direction, from which water is sprayed out at high speed.
  • This water jet treatment forces the fibers from the respective projections 13 to the side to the regions defined in between, as a result of which the openings 3 are formed and at the same time the fibers are felted and entangled with one another. In this way, the water jets, in cooperation with the respective projections 13, effectively push the fibers aside into the flat area on the cylinder 15, while at the same time the fibers are swallowed up.
  • the companies cross partly in front of and behind the respective openings 3 and extend along the edges of these openings. As a result, the openings appear clean and sharp, as if they had been cut out or punched out.
  • the nonwoven web thus apertured and fiber-entangled is then fed to a pair of nip rollers 18 between which the excess liquid is removed.
  • the fleece is then dried and further processing methods are used.
  • a 100% polyester fiber layer with a basis weight of 30g / m2 was used with columnar water jets at a pressure of 70 kg / cm2 and a water quantity of 9.5 l / m2 treated to obtain a non-woven fabric with an opening pattern, as shown in Figures 5 and 6.
  • the production speed was 70 m / min.
  • a large number of nozzles with an opening diameter of 130 ⁇ and a distance of 1 mm were used as the nozzle arrangement.
  • a seamless cylinder with a diameter of 500 mm made by a nickel electro-molding technique was used as the platen cylinder.
  • the surface of the cylinder was provided with a plurality of substantially hemispherical projections, each with a diameter of 2 mm and a height of 0.8 mm, which projections were regularly distributed in such a way that 35% of the surface of the cylinder was covered and where a flat surface extends between the protrusions and occupies 9% of the surface of the cylinder.
  • the fleece was treated in the same way as in the main example, but the receiving cylinder was covered by an endless belt made of a flat fabric with 10 stitches (plain weave 10 meshes) replaced, whereby a non-woven fabric with an opening pattern acc. Fig. 7 was obtained.
  • the fleece was treated in the same manner as in the main example, but the receiving cylinder from FIG. 3 was rounded by an endless belt made of a satin weave 26 meshes, and by a seamless cylinder of 350 mm in diameter which was passed through a Nickel-Elektro-Form-Technik was produced and had a large number of through bores, each with a diameter of 2 mm, which were regularly distributed in the circumferential surface of the cylinder, whereby a gap was provided in which the nonwoven fabric could pass.
  • the web was treated with a curtain-like water jet, which was delivered from the inside of the endless belt with a pressure of 15 kg / cm2 and a flow rate of 30 l per square meter to achieve a production speed of 10 m per minute.
  • a nonwoven fabric with an opening pattern according to FIG. 8 was obtained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)
EP87119378A 1986-12-31 1987-12-30 Nappe de fibres perforée Expired - Lifetime EP0273454B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP312896/86 1986-12-31
JP61312896A JPH0737702B2 (ja) 1986-12-31 1986-12-31 開孔模様を有する不織布

Publications (3)

Publication Number Publication Date
EP0273454A2 true EP0273454A2 (fr) 1988-07-06
EP0273454A3 EP0273454A3 (en) 1989-06-07
EP0273454B1 EP0273454B1 (fr) 1993-08-04

Family

ID=18034755

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87119378A Expired - Lifetime EP0273454B1 (fr) 1986-12-31 1987-12-30 Nappe de fibres perforée

Country Status (6)

Country Link
US (1) US4840829A (fr)
EP (1) EP0273454B1 (fr)
JP (1) JPH0737702B2 (fr)
DE (1) DE3786907D1 (fr)
ES (1) ES2043641T3 (fr)
GB (1) GB2200927A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2918717A4 (fr) * 2012-11-06 2016-07-06 Taiyo Machinery Mfg Co Ltd Dispositif permettant de fabriquer un produit moulé en tissu non tissé et son procédé de fabrication

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EP3582733B1 (fr) 2017-02-16 2022-08-17 The Procter & Gamble Company Articles absorbants avec des substrats ayant des motifs répétitifs d'ouvertures comprenant une pluralité d'unités récurrentes
JP6337221B1 (ja) * 2017-10-12 2018-06-06 ユニ・チャーム株式会社 吸収性物品
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TWI699196B (zh) * 2018-05-23 2020-07-21 黃振正 用於製造具導流薄層物的模具及其成品
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ES2043641T3 (es) 1994-01-01
GB8730335D0 (en) 1988-02-03
DE3786907D1 (de) 1993-09-09
US4840829A (en) 1989-06-20
EP0273454A3 (en) 1989-06-07
JPH0737702B2 (ja) 1995-04-26
JPS63243360A (ja) 1988-10-11
EP0273454B1 (fr) 1993-08-04
GB2200927A (en) 1988-08-17

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