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WO1997019659A1 - Dispositif de formation par soufflage de corps en fibres sur une bande transporteuse permeable a l'air et en mouvement - Google Patents

Dispositif de formation par soufflage de corps en fibres sur une bande transporteuse permeable a l'air et en mouvement Download PDF

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Publication number
WO1997019659A1
WO1997019659A1 PCT/SE1996/001533 SE9601533W WO9719659A1 WO 1997019659 A1 WO1997019659 A1 WO 1997019659A1 SE 9601533 W SE9601533 W SE 9601533W WO 9719659 A1 WO9719659 A1 WO 9719659A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
mat
conveyor path
hood
fibres
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.)
Ceased
Application number
PCT/SE1996/001533
Other languages
English (en)
Inventor
Gunnar Edwardsson
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.)
Essity Hygiene and Health AB
Original Assignee
SCA Molnlycke AB
Molnlycke Vafveri AB
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 SCA Molnlycke AB, Molnlycke Vafveri AB filed Critical SCA Molnlycke AB
Priority to JP9520408A priority Critical patent/JP2000501145A/ja
Priority to EP96941257A priority patent/EP0866681A1/fr
Publication of WO1997019659A1 publication Critical patent/WO1997019659A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15617—Making absorbent pads from fibres or pulverulent material with or without treatment of the fibres
    • A61F13/15626—Making fibrous pads without outer layers

Definitions

  • the present invention relates to apparatus for air-laying on a moving air-permeable conveyor path fibre bodies which have a profiled cross-section transversely to the direction of path movement, wherein the apparatus includes at least one air-laying unit which includes mean ⁇ for delivering a stream of air-carried fibres to a region above the moving conveyor path, means for generating a subpressure in the region in which the stream of air-carried fibres is delivered beneath the whole of that part of the air-permeable conveyor path located in said delivery region, and means for delimiting the stream of air-carried fibres from ambient air.
  • the apparatus includes at least one air-laying unit which includes mean ⁇ for delivering a stream of air-carried fibres to a region above the moving conveyor path, means for generating a subpressure in the region in which the stream of air-carried fibres is delivered beneath the whole of that part of the air-permeable conveyor path located in said delivery region, and means for delimiting the stream of air-carried fibres from ambient air.
  • Apparatus which function to air-lay fibre bodies on a moving air-permeable conveyor path are often used to shape the absorbent bodies of disposable diapers, sanitary napkins, incontinence guards and like products.
  • these absorbent bodies are given suitable properties by profiling the bodies during manufacture, i.e. by producing fibre bodies which, in cross-section, have parts of mutually different thicknesses. This i ⁇ achieved, for instance, by laying a layer of one dimension on top of an earlier layer of a different dimension.
  • One problem with this procedure is that the earlier laid layer is prone to be disturbed or damaged when air-laying the subsequent layer. It is also desirable to be able to readily produce absorbent bodies that contain different types of fibre in different parts of the absorbent body.
  • the primary object of the present invention is to solve this problem.
  • the present invention with an apparatus of the kind defined in the introduction which is characterized in that the means for delimiting the stream of air-carried fibres includes at least one part which coacts with the aid-permeable conveyor path and which when seen transversely to the direction of path movement has smaller dimensions than the air-permeable conveyor path. Because the air-permeable conveyor path and the subpressure-generating devices coacting therewith extend beyond the means that delimit the stream of air-carried fibres, ambient air i ⁇ able to flow through the air-permeable conveyor path in directions parallel with the fibre-carrying air ⁇ tream.
  • Thi ⁇ counteracts the occurrence of cross air flows that are able to disturb layers of fibres earlier laid on the air-permeable conveyor path, while, at the same time, providing an air seal at the edges of the means which delimit the stream of air-carried fibres, this air seal preventing fibres, or possible super- absorbents, from spreading outside the delivery region.
  • Earlier laid fibre layers will also be influenced by a retaining suction force which strives to maintain the shape of the ⁇ e earlier laid fibre layer ⁇ .
  • the continuou ⁇ conveyor path is comprised of a succession of moulds having air-permeable bottoms and extending sequentially in the direction of conveyor path movement
  • the means for delimiting the stream of air-carried fibres is comprised of at least one first mat-forming hood which coacts with a vacuum box that extends transversely across the entire mould, wherein at least a part of the first mat-forming hood extends across a part of the bottoms of respective by-passing moulds trans ⁇ versely to the direction of conveyor path movement, and wherein ambient air has free access to those regions of the mould bottoms which extend transversely beyond the mat- forming hood.
  • the moulds are also disposed sequentially around the periphery of a mat-forming cylinder.
  • a second mat-forming hood is mounted upstream of the first mat-forming hood as seen in the direction of conveyor path movement and extends transversely across essentially the whole of the bottom of respective by-passing moulds.
  • the fir ⁇ t mat-forming hood includes a part having side walls which diverge in the direction of conveyor path movement.
  • the first mat-forming head includes a part which has side walls that converge in the direction of conveyor path movement.
  • Fig. 1 is a schematic, perspective view of a mat-forming hood and a mat-forming cylinder or wheel according to a fir ⁇ t embodiment of the invention
  • Fig. 2 is a section view taken on the line II-II in Fig. 1;
  • Fig. 3 is a section view taken on the line III-III in Fig.1;
  • Fig. 4 is a schematic perspective view of a mat-forming hood and a mat-forming cylinder according to a second embodiment of the invention
  • Fig. 5 is a sectional view taken on the line V-V in Fig. 4;
  • Fig. 6 is a section view taken on the line VI-VI in Fig. 4;
  • Fig. 7 illustrates two mat-forming hoods and a mat-forming cylinder according to a third embodiment of the invention
  • Fig. 8 is a sectional view taken on the line VIII-VIII in Fig. 7;
  • Fig. 9 illustrates three mat-forming hoods and a mat-forming cylinder according to a fourth embodiment of the invention.
  • Fig. 10 is a sectional view taken on the line X-X in Fig. 9.
  • Figs. 1-3 illustrate schematically a fir ⁇ t embodiment of the inventive arrangement comprising a mat-forming cylinder or wheel 1 which rotates in the direction of the arrow A. Moulds 2 having air-permeable bottoms are dispo ⁇ ed ⁇ equentially around the cylinder periphery.
  • a vacuum box 3 is mounted in the interior of the cylinder 1, radially inwards of the mould-containing peripheral surface of the cylinder, and remains stationary a ⁇ the cylinder rotates.
  • the vacuum cylinder 3 extends over the full extension of the mould bottoms transversely to the direction of cylinder rotation.
  • a mat-forming hood i ⁇ mounted radially outside the cylinder periphery and within the region of the peripheral extension of the vacuum box 3.
  • the mat-forming hood 4 is connected to means (not shown) for delivering air-carried fibres or like material, e.g. air-carried cellulose fibres.
  • air-carried fibres or like material e.g. air-carried cellulose fibres.
  • the moulds After having passed the mat-forming hood, the moulds are emptied of their fibre bodies onto a conveyor (not shown) in a conventional manner, for further processing of said bodies in a proces ⁇ line.
  • the width of the hood 4 varies in the direction of its periphery.
  • a first part a of the hood 4 located upstream in the direction of cylinder rotation has a width which corre- sponds to the width of the vacuum box 3, whereby a fibre layer will be air-laid in a mould 2 across the whole length of the mould bottom when the mould arrives in thi ⁇ region of the hood.
  • a sectional view of this part of the hood 4 is shown schematically in Fig. 2.
  • the sectioned arrows in this Figure, and also in Figs. 3, 5, 6 and 8, indicate streams of air-carried fibres or the like, while hollow arrows indicate streams of air alone. As illustrated in Fig.
  • the hood Downstream of the aforesaid first part of the hood 4, the hood has a ⁇ econd part b having walls which converge in the direction of movement of the moulds, thi ⁇ second hood part being terminated with a section c having walls which are mutually parallel in said movement direction, wherein the section c extends transversely over only a central part of the cylinder and its moulds.
  • the arrangement is so configured that ambient air has free acces ⁇ to the region outside the mat-forming hood 4.
  • Fig. 3 is a cross-sectional view which illustrates the fibre layer laid in a mould 2 immediately prior to the mould having passed the hood 4.
  • a stream of air-carried fibres passes through the mould bottom while leaving its fibre content solely in a central part of the mould, while ambient air flows through the mould bottom on both sides of the hood.
  • the stream ⁇ of ambient air and air-carried fibres are parallel with one another, and the ⁇ treams of ambient air will therefore function as air seals and ensure that fibres are unable to flow laterally from the hood.
  • the ambient air has free access to the mould bottom in the region outside the hood 4, the occurrence of transverse air streams that would be liable to impair the fibre layer earlier laid on the mould bottom is prevented.
  • the mould 2 passes the section c of the hood 4, a fibre layer will be laid on the earlier laid layer solely in the central part of the mould.
  • the part b of the hood 4 narrow ⁇ successively, which means that as the mould 2 passes this part of the hood, that portion of the layer earlier laid on the mould bottom and located outside the side edges of the hood 4 will successive ⁇ ive- ly increa ⁇ e. Consequently, there will be laid on the mould bottom as the mould pa ⁇ es the hood 4 a fibre layer whose thickness increases successively from the end edges of the mould 2 on both sides of the central region of the mould 2 defined by the side edges of the hood 4 in the section a.
  • Figs. 4-6 illustrates a second embodiment of an inventive arrangement in views similar to Figs. 1-3.
  • the mat-forming hood 5 of the second embodiment has a different form to the mat-forming hood 4 of the first embodiment illustrated in
  • the mat-forming hood 5 has a first part a which is located upstream in the direction of rotation of the mat- forming cylinder 6 and which has side edges that are parallel with the direction of cylinder rotation, and a second part b that has side edges which diverge in said direction.
  • a succession of moulds 7 Disposed around the cylinder periphery is a succession of moulds 7 that have air-permeable bottoms and which coact with a vacuum box 8 mounted in the cylinder interior during part of their rotational movement.
  • each mould 7 will first pass beneath the first part a of the hood 5, wherewith a well-delimited fibre layer is deposited centrally on the bottom of the mould 7, as illustrated in Fig. 5.
  • the mould then passes beneath the second part b of the hood 5 , wherewith a successively greater part of the mould bottom is contacted by the stream of air-carried fibres from the mat-forming hood, such that the layer of fibres which becomes successively wider trans ⁇ versely to the direction of cylinder rotation, this successive ⁇ sively wider layer being laid on top of a fibre layer earlier laid on the mould bottom.
  • Fig. 6 is a cross-sectional view which shows the fibre layer that has been laid in the mould 7 immediately before the mould has completely passed the downstream end of the hood 5.
  • the laid fibre layer exiting from the hood 5 will qualita ⁇ tively have the same form as the fibre layer exiting from the hood 4 in the Fig. 3 embodiment.
  • the slope of these upper side ⁇ is also influenced by the slope of the converging or diverging sides of the hood, wherein the slope of the upper sides becomes greater the more the sides of the hoods are inclined to the rotational direction of the cylinder.
  • the shape and the angle of inclination of these parts of the upper sides of the fibre bodies can be varied in many different ways within the scope of the invention, by varying the shape and the slope of the convergent and divergent sides of the hoods; for instance, said sides may include both straight and curved sections.
  • Figs. 7 and 8 illustrate a third embodiment of the invention.
  • two mat-forming hoods 9, 10 are placed sequentially in the direction of movement of a succession of moulds 12 disposed in the peripheral ⁇ urface of a mat-forming cylinder 11.
  • Mounted stationarily in the cylinder interior and radially inwards of the cylinder periphery are two vacuum boxes 13, 14 which, by virtue of their respective positions, coact with respective hoods 10 and 9.
  • Both hoods 9, 10 have sides which extend parallel with the direction of mould movement, although the hood 9 has a significantly smaller transver ⁇ e extension than the hood 10, this latter hood extending transversely over essentially the full length of the moulds 12.
  • a first, broad fibre layer is deposited in the moulds, this broad layer being overlaid with a central narrower fibre layer as the mould passes the downstream hood 9, as shown schematically in Fig. 8.
  • the air-borne fibres contained in the hoods 9, 10 may be of one and the same kind or of different kinds, with or without an admixture of particulate superabsorbent material.
  • the hoods may be integrated to form one single hood, although the illustrated arrangement of two hoods 9, 10 is suitable when the various layers are to include precise quantities of fibre.
  • Figs. 9 and 10 illustrate a fourth embodiment of an inventive arrangement which includes three mat-forming hoods 15, 16, 17 which coact with a suction box 19 mounted in the interior of a mat-forming wheel or cylinder 18.
  • the hoods 15-17 are placed in side-by-side relationship and together cover essentially the full length of the moulds 20, each of the hoods having a much smaller width than the length of the mould.
  • Fig. 9 When in operation, the arrangement illustrated in Fig. 9 will thus lay three profiled part-bodies 21-23 in each mould 20, these bodies being juxtaposed and therewith forming together a complete absorbent body.
  • harmful cross-flow ⁇ in the fibre layer laid beneath the hood 15 are prevented by virtue of the surrounding air, which in this case is com ⁇ prised of a stream of air-carried fibres, having free access to those regions of the mould bottom that extend transversely outwardly of the mould bottom.
  • the central part-body 22, which is located in the wet region of the combined absorbent body thus formed, is conveniently comprised of a type of fibre which will provide good liquid ab ⁇ orbency, e.g. CTMP or cro ⁇ -linked cellulose fibres, whereas the outer part-bodies 21 and 23 will conveniently be comprised of a type of fibre which provides good liquid dispersion properties, for instance chemical pulp.
  • the embodiment illustrated in Figs. 9 and 10 enables absorbent bodies having desired properties with regard to liquid absorbency, liquid dispersion and liquid storage in a simple and effective manner. It is also possible to admix different quantities of superabsorbents in different part ⁇ of the absorbent body in a simple manner.
  • hoods can be arranged adjacent the hoods illustrated in Figs. 1, 4, 7 and 9.
  • the hoods whose widths are smaller than the lengths of the moulds need not be placed centrally, but may be displaced transversely in one direction or the other and several such hoods may be placed adjacent one another.
  • the embodiment illustrated in Figs. 7 and 8 can be combined with one of the remaining two embodiments, for instance by providing the hood 10 with a part having converging or diverging side walls. This also applies to the embodiment illustrated in Figs. 9 and 10.
  • the hood ⁇ 16 and 17 may have converging outer walls.
  • the invention can also be applied to continuously moving parts other than mat-forming cylinders, for instance a moving linear air-permeable conveyor path.
  • the moulds may alternatively be disposed with their longitudinal axes in the movement direction, therewith producing transversely profiled fibre bodies.
  • the invention i ⁇ therefore only restricted by the content of the following Claims.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Vascular Medicine (AREA)
  • Epidemiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Nonwoven Fabrics (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

La présente invention concerne une installation permettant de former par soufflage des corps en fibres sur une bande transporteuse (2, 7, 12) perméable à l'air et en mouvement, ces corps en fibres étant caractérisés par leur profil selon une coupe perpendiculaire au sens de défilement (A) de la bande transporteuse. L'installation comporte au moins un poste de formage par soufflage équipé d'un organe débitant vers une région située au-dessus d'une bande transporteuse en mouvement un flux de fibres aéro-propulsées. L'installation comporte également un organe (3; 8; 13, 14) exerçant une souspression sur le flux de fibres aéro-propulsées se trouvant dans la zone de réception, cette souspression étant formée au-dessous de l'ensemble de la partie de la bande transporteuse située au niveau de la zone de réception. L'installation comporte enfin un organe (4; 5; 9, 10) séparant de l'air ambiant le flux de fibres aéro-propulsées. Selon l'invention, l'organe séparant de l'air ambiant le flux de fibres aéro-propulsées comporte au moins une partie (b; 9) en interaction avec la bande transporteuse perméable à l'air, les dimensions de cet organe étant, perpendiculairement au sens de défilement, inférieures à celles de la bande transporteuse perméable à l'air.
PCT/SE1996/001533 1995-11-27 1996-11-25 Dispositif de formation par soufflage de corps en fibres sur une bande transporteuse permeable a l'air et en mouvement Ceased WO1997019659A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP9520408A JP2000501145A (ja) 1995-11-27 1996-11-25 動く空気浸透性のコンベア走路上に空気運搬された繊維体をエアレイするための装置
EP96941257A EP0866681A1 (fr) 1995-11-27 1996-11-25 Dispositif de formation par soufflage de corps en fibres sur une bande transporteuse permeable a l'air et en mouvement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9504215A SE505835C2 (sv) 1995-11-27 1995-11-27 Anordning för att på en löpande luftgenomtränglig bana genom luftläggning bilda fiberkroppar
SE9504215-6 1995-11-27

Publications (1)

Publication Number Publication Date
WO1997019659A1 true WO1997019659A1 (fr) 1997-06-05

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PCT/SE1996/001533 Ceased WO1997019659A1 (fr) 1995-11-27 1996-11-25 Dispositif de formation par soufflage de corps en fibres sur une bande transporteuse permeable a l'air et en mouvement

Country Status (4)

Country Link
EP (1) EP0866681A1 (fr)
JP (1) JP2000501145A (fr)
SE (1) SE505835C2 (fr)
WO (1) WO1997019659A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1253231A3 (fr) * 2001-04-20 2003-01-15 SCA Hygiene Products AB Procédé de préparation de bandes fibreuses de produits absorbants et les bandes fibreuses ainsi obtenues
US6818166B2 (en) 2001-04-20 2004-11-16 Sca Hygiene Products Ab Method of forming a fiber web for use in absorbent products, and fiber web produced according to the method
WO2010015052A1 (fr) * 2008-08-05 2010-02-11 Johnson & Johnson Industrial Ltda Procédé de fabrication d'un cœur absorbant comportant une pluralité de premières régions et une seconde région entourant chacune des premières régions
WO2010015050A1 (fr) * 2008-08-05 2010-02-11 Johnson & Johnson Industrial Ltda Procédé de fabrication d'un noyau absorbant ayant des régions absorbantes agencées de manière concentrique
US7994385B2 (en) 2008-08-05 2011-08-09 Johnson & Johnson Ind. E Com. Ltda Absorbent article including absorbent core having concentrically arranged absorbent regions
US8093448B2 (en) 2008-08-05 2012-01-10 Johnson & Johnson Ind. E. Com LTDA Absorbent article including absorbent core having a plurality of first regions and a second region surrounding each of the first regions
EP2581067A4 (fr) * 2010-06-10 2014-11-19 Kao Corp Procédé de production d'un produit absorbant

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5624877B2 (ja) * 2010-12-27 2014-11-12 花王株式会社 吸収体の製造方法及び製造装置
JP6720674B2 (ja) * 2016-04-26 2020-07-08 王子ホールディングス株式会社 吸収体の製造装置および製造方法
JP6911979B2 (ja) * 2016-04-26 2021-07-28 王子ホールディングス株式会社 吸収体の製造装置および製造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988004165A1 (fr) * 1986-12-08 1988-06-16 Nordson Corporation Procede et appareil pour deposer dans un substrat un materiau absorbant l'humidite
US4927582A (en) * 1986-08-22 1990-05-22 Kimberly-Clark Corporation Method and apparatus for creating a graduated distribution of granule materials in a fiber mat
EP0478182A1 (fr) * 1990-09-12 1992-04-01 McNEIL-PPC, INC. Méthode et dispositif de fabrication d'un coussin

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4927582A (en) * 1986-08-22 1990-05-22 Kimberly-Clark Corporation Method and apparatus for creating a graduated distribution of granule materials in a fiber mat
WO1988004165A1 (fr) * 1986-12-08 1988-06-16 Nordson Corporation Procede et appareil pour deposer dans un substrat un materiau absorbant l'humidite
EP0478182A1 (fr) * 1990-09-12 1992-04-01 McNEIL-PPC, INC. Méthode et dispositif de fabrication d'un coussin

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1253231A3 (fr) * 2001-04-20 2003-01-15 SCA Hygiene Products AB Procédé de préparation de bandes fibreuses de produits absorbants et les bandes fibreuses ainsi obtenues
US6818166B2 (en) 2001-04-20 2004-11-16 Sca Hygiene Products Ab Method of forming a fiber web for use in absorbent products, and fiber web produced according to the method
WO2010015052A1 (fr) * 2008-08-05 2010-02-11 Johnson & Johnson Industrial Ltda Procédé de fabrication d'un cœur absorbant comportant une pluralité de premières régions et une seconde région entourant chacune des premières régions
WO2010015050A1 (fr) * 2008-08-05 2010-02-11 Johnson & Johnson Industrial Ltda Procédé de fabrication d'un noyau absorbant ayant des régions absorbantes agencées de manière concentrique
US7994385B2 (en) 2008-08-05 2011-08-09 Johnson & Johnson Ind. E Com. Ltda Absorbent article including absorbent core having concentrically arranged absorbent regions
CN102202622A (zh) * 2008-08-05 2011-09-28 约翰逊及约翰逊工业有限公司 制备具有多个第一区域和围绕每个第一区域的第二区域的吸收芯的方法
US8093448B2 (en) 2008-08-05 2012-01-10 Johnson & Johnson Ind. E. Com LTDA Absorbent article including absorbent core having a plurality of first regions and a second region surrounding each of the first regions
US8871123B2 (en) 2008-08-05 2014-10-28 Johnson & Johnson Ind. E Com. Ltda. Method of making an absorbent core having a plurality of first regions and a second region surrounding each of the first regions
EP2581067A4 (fr) * 2010-06-10 2014-11-19 Kao Corp Procédé de production d'un produit absorbant

Also Published As

Publication number Publication date
SE9504215L (sv) 1997-05-28
EP0866681A1 (fr) 1998-09-30
JP2000501145A (ja) 2000-02-02
SE9504215D0 (sv) 1995-11-27
SE505835C2 (sv) 1997-10-13

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