US20090229082A1 - Apparatus and method for dry forming of Fibrous Tissue - Google Patents

Apparatus and method for dry forming of Fibrous Tissue Download PDF

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Publication number
US20090229082A1
US20090229082A1 US11/921,918 US92191806A US2009229082A1 US 20090229082 A1 US20090229082 A1 US 20090229082A1 US 92191806 A US92191806 A US 92191806A US 2009229082 A1 US2009229082 A1 US 2009229082A1
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US
United States
Prior art keywords
suction
forming
suction area
pressure drop
sub
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.)
Abandoned
Application number
US11/921,918
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English (en)
Inventor
Mark Bateman Rold
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Individual
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Individual
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Assigned to DAN-WEB HOLDING A/S reassignment DAN-WEB HOLDING A/S ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ROLD, MARK BATEMAN
Publication of US20090229082A1 publication Critical patent/US20090229082A1/en
Abandoned legal-status Critical Current

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    • 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
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • 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
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D04H1/736—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged characterised by the apparatus for arranging fibres

Definitions

  • the present invention relates to an apparatus and a method for dry forming of fibrous tissue and comprising a suction box and a superjacent forming head with a forming wire fitted in between, on which the tissue is formed, in that the suction box has a suction area that sucks the fibres down towards the forming wire.
  • beaching in Danish termed “strandbred”) corresponds to the characteristic appearance that a fibrous tissue obtain. This appearance looks, most of all, like the pattern remained in the sand on a beach.
  • the intake air from the suction box which sucks the fibres down towards the wire.
  • the intake air from the suction box sucks the material from the forming head over the wire down to the forming wire.
  • the material is caught by the perforated wire, while the intake air continues down into the suction box and further in a canal system.
  • the suction box is dimensioned and fitted in order to provide a essentially uniform suction, in manner ensuring that there also is provided a uniform air velocity and hence a uniform laying of fibre material in a homogenous tissue on the forming wire.
  • the beaching that can be found in products does not necessarily appear in the entire suction area. Therefore, it is possible to find a product, in which beaching only appears in certain areas, for instance along one edge of the formed tissue. Even though it has not been possible to come up with a concrete explanation, within the trade, it is a prior assumption that beaching results from the disturbances that appear in the air stream across the suction box in the area, where beaching occur. Accordingly, by using the known adjustment methods, it has not been possible to reduce these disturbances that appear in the air stream and hence provide a homogeneous tissue without beaching.
  • a pressure drop regulating means is fitted in the suction box, in a partly across the width of the forming wire extending sub-section of the suction area, in order to regulate the air stream and hence the turbulence that appears in said sub-section of the suction area of the suction box.
  • the method according to the invention is characteristic in that, a pressure drop regulation is provided in the suction box, in a partly across the width of the forming wire extending sub-section of the suction area, in order to regulate the air stream and hence the turbulence that appears in said sub-section of the suction area.
  • the solution in accordance with the present invention is based on the recognition, that beaching typically occurs in a sub-section of the suction area, and that a regulation parameter capable of regulating the air stream in such area, accordingly, is required.
  • the means is adjustably mounted, substantially with spacious adjustment possibilities in three dimensions. This makes it possible to adjust the pressure drop regulating means according to the parameters of the formed fibrous tissue.
  • beaching problems vary in a manner that depends upon the parameters of the formed fibrous tissue. Hence, beaching depends on the type of fibre being applied and the grammage being laid.
  • the pressure drop regulation according to the present invention is of particular advantage regarding production of products with grammage between 5 and 60 g/m 2 , preferably between 20 and 50 g/m 2 , because it has been shown that beaching problems particularly are associated with this kind of products. Furthermore, it has been shown that a greater degree of beaching occurs in products with short fibres than in products produced with long fibres. Therefore, the apparatus and method according to the present invention will be particular advantageous in the process of fibrous tissue production based on application of short fibres.
  • the apparatus can be equipped with replaceable pressure drop regulating means, so that a pressure drop regulating means adapted to a specific fibrous tissue is provided.
  • the means has a roughly smooth surface, in which the fibres cannot get stuck. Even though a smooth surface is preferred in order to provide the pressure drop regulating means, formed as a plate, which is mounted at the suction box, it would still, as an alternative, be possible to apply plates with more or less degree of perforation that enables a varied pressure drop regulation in the area, in which such plate or, alternatively, a mesh would be located.
  • the effect of the pressure drop regulating means is beneficial in connection to devises, in which the forming head has at least one perforated rotating drum, in which fibres mixed with air enter the first end of the drum, which contains agents for fluidization of the fibres, and that the means is located in the suction area at said first end of the drum.
  • the fibres are feed from one side and the forming head will typically be subject to a circulating motion through an additional rotating drum, if the forming head contains two or more drums.
  • the pressure drop regulating means has to be located at the first end of the drum, where the fibres are injected. In cases, in which more drums are applied, it would be at the first end or at the end of injection of the perforated rotating drum, which is located at the front end, as viewed in the feeding direction of the forming wire.
  • the plate In such forming heads with rotating drums, the plate would mainly be located in the area, which is call the first quadrant, that is at the feed-in end of the first rotating drum, which is provided in the forming head, as viewed in the feeding direction of the forming wire. It has emerged that this may inhibit the action of or completely eliminate beaching.
  • This air velocity is governed by the use of the pressure drop regulating means in such a manner, that a more or less uniform air velocity is provided across the entire suction area, after the pressure drop regulation, so that it inhibits the influence of the different layer thickness of the fibres, which otherwise would be the cause of variation of the pressure drop, and hence the air velocity across the suction area.
  • forming heads without rotating drums would also have feeding/injection of fibres with different orientation. Even if attempts are made to provide the cloud of fibres in the forming as homogeneous as possible, it will also in this situation, turn out, that non-uniform fittings of the fibrous tissue may occur. Therefore, a pressure drop regulating means will be beneficial in such forming head as well.
  • the sub-area of the suction area normally, is provided so it adjoins an edge of the suction area.
  • the means is provided with a boundary, which is tight-fitting to the boundary of the suction area at the specified sub-section. Accordingly, no unfavourable air streams or special turbulences will occur at slits between the pressure drop regulating means and the boundary of the suction area.
  • the pressure drop regulating means may be provided as a plate that may have different forms. Thus, it is not restricted to be rectangular, and hence it may be formed differently.
  • the plate may be provided as a plane plate or as a curved plate for provision of different pressure drop regulations across the entire suction area.
  • FIG. 1 shows a side view of an apparatus according to the invention
  • FIG. 2 shows a view corresponding to FIG. 1 , viewed from above and with certain parts omitted,
  • FIG. 3 shows an enlarged view of a detail of the apparatus shown in FIG. 1 ,
  • FIGS. 4 and 5 show a partial view illustrating different adjustment principles for the plate shown in FIG. 1 .
  • FIG. 6 shows five alternative embodiments of the plate shown in FIG. 1 .
  • FIG. 7 shows an adjustment option for the plate shown in FIG. 1 .
  • FIG. 8 shows a further adjustment option for the plate shown in FIG. 1 .
  • FIG. 9 shows an additional adjustment option for the plate shown in FIG. 1 .
  • FIG. 10 shows a further embodiment for the profile of the plate shown in FIG. 1 .
  • FIG. 11 shows an additional embodiment for the profile of the plate shown in FIG. 1 .
  • FIG. 12 shows a further embodiment for an apparatus according to the invention.
  • FIGS. 1 and 2 An embodiment for an apparatus according to the invention is shown in FIGS. 1 and 2 .
  • the apparatus comprises a forming head 1 , in which there is provided two rotating perforated drums 10 , each comprising spike rollers that produce agents for fluidization of fibres, which are feed into the drum as indicated by the arrow heads 12 and 13 in FIG. 2 .
  • the fibres can, in this way, be feed into the first end 14 of the two drums 10 .
  • connections which will bring about a circulating flow 15 of the fibres between the two drums 10 .
  • a forming wire 2 Underneath the forming head 1 there is provided a forming wire 2 , on which a fibrous tissue 9 is formed, as the forming wire is moved in the direction of motion as indicated by an arrow head 16 .
  • a plate 6 is provided in a sub-section of the suction area 17 , where said plate 6 provides a pressure drop regulating means 3 in the specified sub-section, as indicated in FIG. 2 .
  • the plate 6 is provided in the sub-section of the suction area, which is located under the first end 14 of the first drum 10 , as viewed in the feeding direction 16 of the forming wire 2 .
  • FIG. 3 an enlarged view of the pressure drop regulating means 3 is shown.
  • the plate 6 is attached to the suction box 4 by means of a fixed hinge member 5 at one side.
  • the plate 6 is at the other side supported by a length-adjustable bar 8 that is attached to the plate by means of a mounting 7 and that is attached to the suction box by means of another mounting 7 ′.
  • an adjustable connection rod 8 at each end of the plate 6 .
  • the plate can be tilted transversely, as it appears from FIG. 4 and the side view illustrated in FIG. 5 .
  • it is possible to adjust the plate 6 so that it covers different sub-sections of the suction area 17 .
  • the plate 6 as illustrated in FIGS. 4 and 5 , not is placed at its edges 18 , 19 lying true against the edges 20 , 21 , as shown in FIG. 2 . However, between the edges 18 , 19 of the plate there would be provided tightenings for the edges 20 , 21 , which define the boundary of the suction area. Accordingly, no unintentional air streams that could cause turbulence in said areas will occur.
  • FIG. 6 illustrates various designs for the plate 6 .
  • a plate 6 ′ with a straight edge 22 at the front.
  • a plate 6 ′′ with a front edge 23 cut inclined at the front.
  • a plate 6 ′′′ with a convex side edge 24 in front.
  • a plate 6 ′′′′ with a concave side edge 25 in front, and a plate 6 ′′′′′ with a saw-toothed edge 26 in front.
  • FIG. 7 illustrates an embodiment, in which the plate 6 is being adjusted about a hinged point 5 , as the length-adjustable bar is being lengthened or shortened, in such a manner that the plate 6 is being rotated upwards or downwards, as indicated at the arrow head 27 .
  • FIG. 8 illustrates a further embodiment, in which the plate is provided by component parts, so that it can be length-adjusted, as indicated by the arrow head 28 .
  • the plate is connected to a hinged point, and the length-adjustable connection rod 8 can be maintained at constant length or it could be lengthened as well.
  • FIG. 9 illustrates a situation, in which the plate 6 is displaced by adjusting the mounting in the fixed hinge member 5 . In this way, a hinge can be height-adjustable or alternatively it is possible to provide more hinged points, in between which the plate 6 can be connected.
  • FIG. 10 illustrates an alternative embodiment for a plate 6 .
  • the plate 6 is provided with a curved edge area 29 in front.
  • the edge area 29 may have other curvatures than the one shown and it may for instance also be manufactured with several rectilinear plate sections provided along bend lines, so that a edged edge area is formed in place of the circular edge area 29 illustrated in FIG. 10 .
  • FIG. 11 illustrates a further embodiment for the plate 6 .
  • the plate is designed with a circular profile 30 that extends across the entire plate.
  • the curve form 30 may be single-buckled or double-buckled.
  • FIG. 12 shows an illustration corresponding to FIG. 2 .
  • a forming head 31 in which there is provided a feeding for fibres, as indicated by the arrow head 32 .
  • the forming head is not provided with drums, as indicated above.
  • the bottom in such forming head may be provided with a mesh with transverse drums or with so-called impellers that coat a mesh at the bottom of a forming head.
  • Such means are, however, left out in the drawing for the sake of clarity.
  • a pressure drop regulating means 3 covering a sub-section of the suction area 17 is provided.
  • the forming head may have another design than the one shown with perforated rotating drums 10 .
  • the suction box may, as well, be constructed with other designs than the funnel-shaped opening against the active suction area. Accordingly, there may be provided a direct opening into the suction box, wherein a sub-section of such suction area is installed with a pressure drop regulating means.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Paper (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • External Artificial Organs (AREA)
US11/921,918 2005-06-09 2006-06-09 Apparatus and method for dry forming of Fibrous Tissue Abandoned US20090229082A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK200500842A DK200500842A (da) 2005-06-09 2005-06-09 Apparat samt fremgangsmåde til törformning af et fibermateriale
DKPA200500842 2005-06-09
PCT/DK2006/000324 WO2006131122A1 (en) 2005-06-09 2006-06-09 Apparatus and method for dry forming of fibre weave

Publications (1)

Publication Number Publication Date
US20090229082A1 true US20090229082A1 (en) 2009-09-17

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ID=37498137

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Application Number Title Priority Date Filing Date
US11/921,918 Abandoned US20090229082A1 (en) 2005-06-09 2006-06-09 Apparatus and method for dry forming of Fibrous Tissue

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US (1) US20090229082A1 (da)
EP (1) EP1910601A1 (da)
CA (1) CA2609655A1 (da)
DK (1) DK200500842A (da)
WO (1) WO2006131122A1 (da)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101858015A (zh) 2009-04-08 2010-10-13 欧瑞康纺织有限及两合公司 用于纤维网干法成形的方法和设备
DE102010035944A1 (de) 2010-08-31 2012-03-01 Oerlikon Textile Gmbh & Co. Kg Verfahren und Vorrichtung zum Trockenformen einer Faserbahn
DE102010052010A1 (de) 2010-11-19 2012-05-24 Oerlikon Textile Gmbh & Co. Kg Vorrichtung zum Trockenformen einer Faserbahn
CN104047201B (zh) * 2013-03-12 2016-01-20 丹东天和实业有限公司 一种热风箱防堵刮板机构

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4627953A (en) * 1983-01-25 1986-12-09 The James River Corporation Method for forming dry laid webs
US6402492B1 (en) * 1999-08-25 2002-06-11 Reifenhauser Gmbh & Co. Maschinenfabrik Apparatus for producing spun bond

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4157724A (en) * 1976-08-24 1979-06-12 Persson Torsten B Method and an apparatus for distributing a disintegrated material onto a layer forming surface
US4353686A (en) * 1981-01-19 1982-10-12 Formica Corporation Apparatus for air-layer fibrous webs
FI94967C (fi) * 1991-09-18 1995-11-27 Yhtyneet Paperitehtaat Oy Menetelmä ja laite aineradan kuivamuodostukseen pitkäkuituisesta materiaalista
RU2157867C2 (ru) * 1998-11-16 2000-10-20 Общество с ограниченной ответственностью "Технобум" Способ формования полотна из аэровзвеси волокнистого материала
DE60109921T2 (de) * 2000-01-28 2006-02-09 Scan-Web I/S Vorrichtung zum trockenverteilen von faserigen materialien
EP1444398B1 (en) * 2001-08-20 2006-06-28 Dan-Web Holding A/S High speed former head

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4627953A (en) * 1983-01-25 1986-12-09 The James River Corporation Method for forming dry laid webs
US6402492B1 (en) * 1999-08-25 2002-06-11 Reifenhauser Gmbh & Co. Maschinenfabrik Apparatus for producing spun bond

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CA2609655A1 (en) 2006-12-14
EP1910601A1 (en) 2008-04-16
DK200500842A (da) 2006-12-10
WO2006131122A1 (en) 2006-12-14

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Owner name: DAN-WEB HOLDING A/S, DENMARK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ROLD, MARK BATEMAN;REEL/FRAME:020291/0117

Effective date: 20071120

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION