WO1998029072A1 - Dispositif et procede de formation par voie seche d'un materiau fibreux ou granuleux - Google Patents

Dispositif et procede de formation par voie seche d'un materiau fibreux ou granuleux Download PDF

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Publication number
WO1998029072A1
WO1998029072A1 PCT/SE1997/002137 SE9702137W WO9829072A1 WO 1998029072 A1 WO1998029072 A1 WO 1998029072A1 SE 9702137 W SE9702137 W SE 9702137W WO 9829072 A1 WO9829072 A1 WO 9829072A1
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WO
WIPO (PCT)
Prior art keywords
belt
space
bars
belts
stretch
Prior art date
Application number
PCT/SE1997/002137
Other languages
English (en)
Inventor
Claes Lychou
Original Assignee
SCA Mölnlycke 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 Mölnlycke AB filed Critical SCA Mölnlycke AB
Priority to AU55036/98A priority Critical patent/AU5503698A/en
Publication of WO1998029072A1 publication Critical patent/WO1998029072A1/fr

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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
    • A61F13/15658—Forming continuous, e.g. composite, fibrous webs, e.g. involving the application of pulverulent material on parts thereof

Definitions

  • the present invention relates to a device and a method for manufacturing an absorbent structure in an absorbent product such as a sanitary napkin, panty protector, incontinence protector, diaper or the like which is manufactured by means of an air- permeable shaping element in the shape of an endless belt, a so-called wire gauze, on one side of which within at least a limited region there is an underpressure and on which wimin the same region but on the opposite side absorbent material is deposited.
  • Absorbent products of this type are known in many designs.
  • Conventionally absorption bodies in these products are produced through cellulose pulp, in e.g. rolls, bales or sheets, being dry-defibrated and in a fluffed up form turned into a pulp mat, sometimes with mixing in of so-called superabsorbents, which are polymers with the capability of absorbing several times their own weight of water or body fluids.
  • the pulp core is often compressed, partly in order to increase its wicking ability, partly in order to reduce the bulk of the pulp core in order to thereby obtain a product which is as compact as possible.
  • underpressure in order to deposite fibre material on a so-called wire gauze, i.e.
  • US 4,675, 144 shows a device for forming absorption bodies, wherein a fibre web is formed on a above mentioned airpermeable endless belt, a so-called wire gauze. Absorption bodies are then cut out from the formed fibre web.
  • Further examples of devices which use the above mentioned technique are US 4,739,910 and US 4,690,853, which show a conveyor and folding device which uses an airpermeable conveyor belt, respectively a wire gauze, on which absorption material is deposited, whereafter absorption bodies are formed by means of a profiled rotating brush.
  • the suction box is the space or spaces on one side of the wire gauze from which the evacuation of air takes place, whereby an underpressure occurs therein.
  • the suction box normally consists of a number of delimiting elements such as wall elements and funnel-like evacuation means.
  • the suction box is further delimited by the airpermeable endless band, the so-called wire gauze, which during use continuously moves past the suction box.
  • the object of the present invention is to provide a method and a device for producing at least a limited space situated on one side of a first at least partially airpermeable endless belt in which space an underpressure is present during use and past which space said first endless belt successively passes while air is sucked through said first endless belt into said space.
  • a distinctive feature of the invention is that each said space momentarily is delimited by partially a part of said first endless belt, partially by a part of a second endless belt and by a pair of bars essentially transverse the common direction of movement of the belts, which divides said second endless belt into a number of sections and which bars are fastened to said second endless belt which is placed so that at least two of said bars continuously are adja- cent said first endless belt.
  • the bars have two elongated sides, two short sides, a certain thickness which, however, is so limited that no important influence occurs with the depositing of the absorption material on the upper side of the wire gauze and which bars are fastened to the second endless belt along its longitudinal side in such a way that the longitudinal direction of the bars is essentially directed across the common direction of movement for the two endless belts.
  • said second endless belt is so placed that it runs parallel with said first endless belt at least a certain stretch while said long sides of at least two bars are adjacent the first at least partially airpermeable endless belt. In this way it can be understood that the at least partially airpermeable first endless belt must have a speed of movement which es- sentially corresponds with the speed of movement for the second endless belt equipped with bars.
  • the method further comprises the use of at least a pair of evacuation suction boxes fixedly arranged by said above mentioned stretch so that each said evacuation suction box continuously covers the short sides of at least two bars in an at least partially sealing way when said bars during use pass said evacuation suction boxes at said stretch, thereby momentarily forming said delimited space.
  • evacuation suction boxes are not used in pairs, one of them is replaced with a cover plate, wherein said cover plate and said evacuation suction box have an at least partially sealing contact with said at least partially airpermeable first endless belt, said second endless belt and the respective short side of the bars when these pass the evacuation region during use.
  • Fig. 1 shows schematically from the side a so-called wire gauze upon which the invention is arranged.
  • Fig. 2 shows the example of an embodiment shown in Fig. 1, seen from above, partially cut away.
  • Fig. 3 shows a variant of the example of an embodiment shown in Figs. 1 and 2, seen from above and partially cut away, with only one evacuation suction box.
  • Fig. 4 shows a cross-section across the direction of movement of the wire gauze, seen in the direction of the arrow IV-IV in Fig.
  • Fig. 1 shows schematically a part of a device for forming absorption bodies for absorbent products.
  • the device here comprises a first endless belt 2 which, for example, through perforation is airpermeable at least in a certain central region and which belt in the preferred embodiment is supported by two rollers 12, 13, of which at least one is driving.
  • Under said first endless belt 2 is a second endless airtight belt 3 placed in such a way that its direction of movement essentially corresponds to that of said first endless belt 2.
  • This second belt 3 is supported by rollers 14,15, which have a distance between centres S.
  • the two belts 2,3 have essentially the same width and are so placed that a certain distance 16 is formed between the underside of the first belt 2 and the upper side of the second belt 3.
  • a number of bars 4 are placed on the upper side of the second belt 3 with their longitudinal direction essentially across the common direction of movement of the two belts 2,3.
  • the bars 4 in the preferred embodiment consist of elongated elements with a rectangular cross-section with short sides 7,8 (Fig. 4) the height of which in general corresponds to the distance 16 between the two belts 2,3.
  • Said bars have furthermore two opposite long sides 5,6 the length of which in the preferred embodiment is less than the whole width of the first belt 2 but at least equally large as its airpermeable central part.
  • the bars 4 are essentially fastened airtight to the second belt 3 along its longitudinal long sides 5.
  • each evacuation suction box 9 has a pipe cuff 16 for connection to an air pump (not shown), which pipe is connected by one end to a rectangular pipe section 17. This has suitably the same height as the bars 4 and project in between the belts 2 and 3.
  • the end of the pipe section 17 facing away from the cuff 16 has sealing tongues 18 extending on both sides in the longitudinal direction of the belts 2,3. These tongues are belt- shaped with the same height as the height of the bars 4 and are during use in sealing contact with the short sides 7,8 of a plurality of bars 4. Sealing between the pipe section 17 and the belts 2,3 is achieved through the upper- resp. underside of the pipe section 17 being in contact with the sides of the belts 2 and 3 facing towards each other and/or with the help of sealing strips 19,20 which project out from the upper- resp. underside of the pipe section 17 and in the lateral direction are in contact with the respective side edges of the belts 2,3.
  • the total length of the pipe section 17 and the sealing tongues 18, measured in the direction of movement of the belts 2,3, is at least so large that in each movement position of the belt 3, the suction boxes 9 laterally always cover at least one of the spaces between bars 4 lying adjacent each other on the belt 3.
  • the length can, as shown in the figures, suitably be almost equally large as the distance S. In this way, a completely closed space 1 is formed between pairs of bars 4 lying adjacent each other, the evacuation boxes 9 and the parts of the belts 2,3 facing towards each other within the distance S.
  • Fig. 3 shows, in a corresponding way to Fig. 2, a variant of the embodiment with only one evacuation suction box 9 but instead a cover plate 10 on the opposite side.
  • the cover plate 10 is a rigidly attached U-section elongated in the direction of movement of the belts 2,3, see Fig. 4. This is arranged lying so that the outside of its web 21 is sealingly in contact with the short sides 8 of the bars 4 while the out- sides of its upper and lower shoulders 22 resp. 23 during operation are in sealing contact with the sides of the belts 2 resp. 3, facing towards each other.
  • the length of the cover plate 10 corresponds to the length of the suction box 9 arranged at the opposite side edge of the belts 2,3, including sealing tongues 18.
  • the method explained by means of the preferred embodiment consequently has only sliding contact surfaces between the short sides 7,8 of the bars 4 and the sealing tongues 18 of the evacuation suction boxes 9 resp. the web 21 of the cover plate 10 and between the pipe section 17 of the evacuation suction boxes 9 resp. the shoulders 22, 23 of the cover plate 10 and the edges of the two endless belts 2,3.
  • the said sliding contact surfaces are thereby not directly subjected to any inflow of airborne absorption material and, moreover, have relatively small extents, which has a positive effect when the friction is to be limited.
  • said surfaces on the belts 2,3 and the bars 4 can be cleaned in a simple way when the respective part has passed the distance S through the use of rotating brushes, blowing compressed air etc.
  • the bars 4 can have a different cross-section than the rectangular one shown, e.g. triangular or round. Neither do the bars 4 need to he at right angles to the longitudinal direction of the belt 3.

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)
  • Absorbent Articles And Supports Therefor (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

L'invention concerne un dispositif et un procédé permettant de produire une structure absorbante destinée à un produit absorbant tel que des serviettes hygiéniques, des protections hygiéniques, des protections d'incontinence, des couches bébé ou équivalent. Selon ce procédé, un élément de mise en forme perméable à l'air ou 'tamis', se présentant sous la forme d'une bande sans fin (2), défile au-dessus d'un espace délimité (1) où règne une pression réduite pendant l'utilisation. Cette réduction de pression est engendrée par aspiration de l'air contenu dans l'espace (1) à travers la bande sans fin (2). Cet espace (1) est momentanément délimité en partie par une section de ladite première bande sans fin (2), en partie par une section de la seconde bande sans fin (3) qui défile parallèlement à la première bande (2), et en partie par une paire de barres (4) d'orientation sensiblement transversale par rapport au sens de défilement commun des bandes (2, 3). Ces barres, fixées à la seconde bande (3), sont en contact hermétique avec la première bande (2). L'espace est également délimité latéralement dans une direction par une boîte d'aspiration/évacuation (9) et dans une autre direction par une autre boîte d'aspiration/évacuation (9) ou une plaque de fermeture (10).
PCT/SE1997/002137 1996-12-27 1997-12-17 Dispositif et procede de formation par voie seche d'un materiau fibreux ou granuleux WO1998029072A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU55036/98A AU5503698A (en) 1996-12-27 1997-12-17 Device and method for air laying of fibre or granular material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9604803-8 1996-12-27
SE9604803A SE508112C2 (sv) 1996-12-27 1996-12-27 Anordning och sätt för luftläggning av fiber- eller granulatmaterial

Publications (1)

Publication Number Publication Date
WO1998029072A1 true WO1998029072A1 (fr) 1998-07-09

Family

ID=20405155

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/002137 WO1998029072A1 (fr) 1996-12-27 1997-12-17 Dispositif et procede de formation par voie seche d'un materiau fibreux ou granuleux

Country Status (6)

Country Link
AU (1) AU5503698A (fr)
CO (1) CO4920197A1 (fr)
SE (1) SE508112C2 (fr)
TN (1) TNSN97213A1 (fr)
TW (1) TW377319B (fr)
WO (1) WO1998029072A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4690853A (en) * 1985-03-14 1987-09-01 Kimberly-Clark Corporation Absorbent structure containing a contoured batt
US5466409A (en) * 1993-10-19 1995-11-14 Kimberly-Clark Corporation Forming belt for three-dimensional forming applications
WO1996017574A2 (fr) * 1994-12-07 1996-06-13 Mcneil-Ppc, Inc. Procede de fabrication d'une structure absorbante stratifiee
WO1996017986A1 (fr) * 1994-12-08 1996-06-13 The Procter & Gamble Company Station de formation par voie pneumatique a deflecteur pour la production de non-tisses

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4690853A (en) * 1985-03-14 1987-09-01 Kimberly-Clark Corporation Absorbent structure containing a contoured batt
US5466409A (en) * 1993-10-19 1995-11-14 Kimberly-Clark Corporation Forming belt for three-dimensional forming applications
WO1996017574A2 (fr) * 1994-12-07 1996-06-13 Mcneil-Ppc, Inc. Procede de fabrication d'une structure absorbante stratifiee
WO1996017986A1 (fr) * 1994-12-08 1996-06-13 The Procter & Gamble Company Station de formation par voie pneumatique a deflecteur pour la production de non-tisses

Also Published As

Publication number Publication date
TNSN97213A1 (fr) 1999-12-31
AU5503698A (en) 1998-07-31
TW377319B (en) 1999-12-21
SE508112C2 (sv) 1998-08-31
SE9604803D0 (sv) 1996-12-27
SE9604803L (sv) 1998-06-28
CO4920197A1 (es) 2000-05-29

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