WO1997019659A1 - Apparatus for air-laying fibre bodies on a moving air-permeable conveyor path - Google Patents
Apparatus for air-laying fibre bodies on a moving air-permeable conveyor path Download PDFInfo
- 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
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 35
- 239000012080 ambient air Substances 0.000 claims abstract description 11
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 239000003570 air Substances 0.000 description 10
- 230000002745 absorbent Effects 0.000 description 9
- 239000002250 absorbent Substances 0.000 description 9
- 239000007788 liquid Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 3
- 229920003043 Cellulose fiber Polymers 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 102100031260 Acyl-coenzyme A thioesterase THEM4 Human genes 0.000 description 1
- 101000638510 Homo sapiens Acyl-coenzyme A thioesterase THEM4 Proteins 0.000 description 1
- 206010021639 Incontinence Diseases 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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.
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- 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
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96941257A EP0866681A1 (en) | 1995-11-27 | 1996-11-25 | Apparatus for air-laying fibre bodies on a moving air-permeable conveyor path |
JP9520408A JP2000501145A (en) | 1995-11-27 | 1996-11-25 | Apparatus for air-laying fibrous bodies on a moving air-permeable conveyor track |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9504215A SE505835C2 (en) | 1995-11-27 | 1995-11-27 | Device for forming fiber bodies on a continuous air-permeable path through aeration |
SE9504215-6 | 1995-11-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997019659A1 true WO1997019659A1 (en) | 1997-06-05 |
Family
ID=20400358
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1996/001533 WO1997019659A1 (en) | 1995-11-27 | 1996-11-25 | Apparatus for air-laying fibre bodies on a moving air-permeable conveyor path |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0866681A1 (en) |
JP (1) | JP2000501145A (en) |
SE (1) | SE505835C2 (en) |
WO (1) | WO1997019659A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1253231A2 (en) * | 2001-04-20 | 2002-10-30 | SCA Hygiene Products AB | Method of forming a fibre web for use in absorbent products, and their fibre web |
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 (en) * | 2008-08-05 | 2010-02-11 | Johnson & Johnson Industrial Ltda | Method of making an absorbent core having a plurality of first regions and a second region surrounding each of the first regions |
WO2010015050A1 (en) * | 2008-08-05 | 2010-02-11 | Johnson & Johnson Industrial Ltda | Method for making an absorbent core having concentrically arranged absorbent regions |
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 |
EP2581067A1 (en) * | 2010-06-10 | 2013-04-17 | Kao Corporation | Process for production of absorber |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5624877B2 (en) * | 2010-12-27 | 2014-11-12 | 花王株式会社 | Absorbent manufacturing method and manufacturing apparatus |
JP6720674B2 (en) * | 2016-04-26 | 2020-07-08 | 王子ホールディングス株式会社 | Absorber manufacturing apparatus and manufacturing method |
JP6911979B2 (en) * | 2016-04-26 | 2021-07-28 | 王子ホールディングス株式会社 | Absorber manufacturing equipment and manufacturing method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1988004165A1 (en) * | 1986-12-08 | 1988-06-16 | Nordson Corporation | Method and apparatus for depositing moisture-absorbent material in a substrate |
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 (en) * | 1990-09-12 | 1992-04-01 | McNEIL-PPC, INC. | A method and apparatus for forming a wad |
-
1995
- 1995-11-27 SE SE9504215A patent/SE505835C2/en not_active IP Right Cessation
-
1996
- 1996-11-25 EP EP96941257A patent/EP0866681A1/en not_active Withdrawn
- 1996-11-25 JP JP9520408A patent/JP2000501145A/en active Pending
- 1996-11-25 WO PCT/SE1996/001533 patent/WO1997019659A1/en not_active Application Discontinuation
Patent Citations (3)
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 (en) * | 1986-12-08 | 1988-06-16 | Nordson Corporation | Method and apparatus for depositing moisture-absorbent material in a substrate |
EP0478182A1 (en) * | 1990-09-12 | 1992-04-01 | McNEIL-PPC, INC. | A method and apparatus for forming a wad |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1253231A2 (en) * | 2001-04-20 | 2002-10-30 | SCA Hygiene Products AB | Method of forming a fibre web for use in absorbent products, and their fibre web |
EP1253231A3 (en) * | 2001-04-20 | 2003-01-15 | SCA Hygiene Products AB | Method of forming a fibre web for use in absorbent products, and their fibre web |
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 (en) * | 2008-08-05 | 2010-02-11 | Johnson & Johnson Industrial Ltda | Method of making an absorbent core having a plurality of first regions and a second region surrounding each of the first regions |
WO2010015050A1 (en) * | 2008-08-05 | 2010-02-11 | Johnson & Johnson Industrial Ltda | Method for making an absorbent core having concentrically arranged absorbent regions |
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 (en) * | 2008-08-05 | 2011-09-28 | 约翰逊及约翰逊工业有限公司 | Method of making an absorbent core having a plurality of first regions and a second region surrounding each of the first 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 |
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 |
EP2581067A1 (en) * | 2010-06-10 | 2013-04-17 | Kao Corporation | Process for production of absorber |
EP2581067A4 (en) * | 2010-06-10 | 2014-11-19 | Kao Corp | Process for production of absorber |
Also Published As
Publication number | Publication date |
---|---|
EP0866681A1 (en) | 1998-09-30 |
SE505835C2 (en) | 1997-10-13 |
SE9504215L (en) | 1997-05-28 |
SE9504215D0 (en) | 1995-11-27 |
JP2000501145A (en) | 2000-02-02 |
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