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WO1989009298A1 - Procede et dispositif pour produire des non-tisses - Google Patents

Procede et dispositif pour produire des non-tisses Download PDF

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Publication number
WO1989009298A1
WO1989009298A1 PCT/DE1989/000176 DE8900176W WO8909298A1 WO 1989009298 A1 WO1989009298 A1 WO 1989009298A1 DE 8900176 W DE8900176 W DE 8900176W WO 8909298 A1 WO8909298 A1 WO 8909298A1
Authority
WO
WIPO (PCT)
Prior art keywords
threads
rollers
toothed rollers
toothed
moving surface
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/DE1989/000176
Other languages
German (de)
English (en)
Inventor
Franz Fourné
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.)
Automatik Apparate Maschinenbau GmbH
Original Assignee
Automatik Apparate Maschinenbau GmbH
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 Automatik Apparate Maschinenbau GmbH filed Critical Automatik Apparate Maschinenbau GmbH
Publication of WO1989009298A1 publication Critical patent/WO1989009298A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/16—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion

Definitions

  • the invention relates to a method and an apparatus for producing spunbonded nonwoven from synthetic polymers, in which the threads forming the spunbonded nonwoven after spinning and cooling as a wide thread chain on a moving surface, e.g. in the manner of a conveyor belt.
  • Spunbonded non-woven, textile-like fabrics are to be understood here, which are formed from continuous filaments directly during the spinning process, be it from melt- or solution-spun polymers or combinations of different polymers that are deposited on the moving surface, which are essentially in the normal direction moved to the direction of the threads to be placed. This means that it is not a tile made of threads that are torn into fibers of finite length after leaving the spinneret before they hit the moving surface.
  • One of these methods uses compressed air-operated suction nozzles as the extraction device. After cooling, the threads are inserted individually or in bundles into these nozzles, so that the compressed air flow in a Venturi-like nozzle ensures that the threads are pulled further down. In this case, a thread speed of approximately 20-100 m / sec is achieved at the outlet end of these nozzles, thus giving the threads a desired pre-stretching.
  • the threads or bundles of threads are more or less spread apart from the lower outlet ends of these suction nozzles, tangled down on a conveyor belt and transported on as a fleece.
  • Another method draws the threads at a higher take-off speed than the spraying speed at the spinnerets by blowing cooling air at higher speeds onto the threads close to the spinnerets, which also pulls them down by air friction and thereby pre-stretching them.
  • these rollers can also be heated to the surface temperature required for hot stretching. In order to avoid that the threads can wind up on one of the pulling rollers, which would make it impossible to deposit the threads behind the rollers, the threads are sucked off the last roller with compressed air operated nozzles.
  • the threads are drawn from many spinnerets arranged in a row, each with a correspondingly high number of spinneret holes, or from one or more long spinnerets with an even division of the spinneret holes or from a plurality of long spinnerets offset with respect to one another, since the take-off nozzles or the electrostatic distribution ensure that the flatest possible structure on the conveyor belt consists of tangled individual threads.
  • the invention has for its object to avoid the high compressed air consumption and still achieve high take-off speeds from the spinnerets without the risk of winding the threads on a take-off roller.
  • this is done in that the threads by means of combing themselves before being fed to the moving surface not touching toothed rollers for the purpose of uniform distribution of the threads in the axial direction of the toothed rollers of a corrugation with a simultaneous positive withdrawal of the threads.
  • the intermeshing but not touching toothed rollers have different effects. Due to the interlocking of the teeth, they bring about the required entrainment effect and thus the safe pulling of the fed threads practically without slippage. In addition, the resulting curl of the threads, due to the interlocking of the teeth, tends to cause the threads to spread evenly along the teeth, the curl causing the threads to spread away from the teeth, thereby allowing the threads to wind up on one of the Tooth rolling is practically excluded.
  • the pair of intermeshing rollers is able to grasp threads that are supplied with more or less tension from one side, to pull them and on the other side to further convey them in a plane symmetrical to this pair of rollers, without any thread tension on the threads on the conveying side must be exercised. In particular, no compressed air is required at this point. All that is required as energy is the drive of this pair of valens to a desired peripheral speed, which is in a certain ratio to the speed at which the threads are drawn off and deposited.
  • the wide thread band which is evened out by the intermeshing rollers, is conveyed evenly further and placed on the moving surface. Because of the absence of compressed air jets, no additional confusion can arise. Due to the possible high deduction and laydown the threads lay themselves in curls and loops on the moving surface, thus forming the desired flat structure.
  • the peripheral speeds of the intermeshing rollers are in the range of about 10-120 m / sec, but can also be lower or higher.
  • toothed rollers Intermeshing, non-contacting toothed rollers have already been used to convey fiber strands combined in the manner of cables.
  • the toothed rollers were only used for conveying without the cable-like character of the fiber strands having been changed in any way.
  • the present invention is to pull off loosely supplied threads and to ensure a uniform distribution within the amount of these threads, that is to say to exert an effect on the threads in the axial direction of the toothed rollers, which is of no importance in the case of the cable-like bundled fiber strands .
  • the threads are fed to the toothed rollers as a belt.
  • the device for performing the method described above is advantageously designed so that the toothed rollers are provided as hollow rollers with slots provided between the teeth and with air inlet openings on their end faces.
  • the size of the air inlet openings on the end faces of the toothed rollers can be made adjustable.
  • each tooth base it is advisable to provide several slots in the axial direction with ridges in between for each tooth base.
  • the slots are expediently offset from one another with respect to the slot belonging to the other toothed roller. This results in a continuous airflow around each tooth.
  • the toothed rollers can also be combined with conventional take-off and stretching rollers, for which purpose one or more optionally heated removal and stretching rollers are provided in front of the toothed rollers.
  • spunbonded nonwovens made of several polymers can also be combined, for example by pulling threads made of polymer A from the first take-off roller, threads made of polymer B from the third take-off roller, from the fifth take-off roller made of polymer C and so on, and after the last take-off - and drawing roller pulls all threads together through the pair of toothed rollers.
  • the uniformity of the threads on the moving surface can be further improved by arranging a device for electrostatically charging the threads between the toothed rollers and the moving surface. Because of this charge, the threads then repel each other, which means that they are distributed evenly across the moving surface.
  • the device is expediently connected on one side to the moving surface, which additionally results in the deposited threads being evened out when the threads are placed on the movable surface.
  • Fig. 3 shows a device in which the threads through Tooth rollers are pulled directly from the spinnerets in a side view
  • Fig. 6 shows the same device in front view.
  • FIG. 1 shows a pair of toothed rollers with the toothed rollers 1 and 2, in which the teeth 3 of the toothed roller 1 and the teeth 4 of the toothed roller 2 mesh with one another but do not touch.
  • a group of threads 5 lying next to one another is drawn off from the toothed rollers 1 and 2 and are subjected to a corrugation in the region of the meshing of the teeth 3 and 4 in accordance with the meshing of the teeth. In this case, however, the threads 5 are not pinched, but are taken along practically without slip due to the corrugation, which results in the positive withdrawal of the threads 5.
  • the two toothed rollers 1 and 2 rotate in the direction of rotation indicated by the two arrows.
  • the toothed rollers 1 and 2 are closed by end plates 6 and 7, which delimit a cavity 8 in the interior of the toothed rollers 1 and 2, which will be discussed in greater detail in connection with FIG. 2.
  • end plates 6 and 7 delimit a cavity 8 in the interior of the toothed rollers 1 and 2, which will be discussed in greater detail in connection with FIG. 2.
  • four air passages 9 are let in, which can be opened or closed from inside by sliding covers 10 to a greater or lesser extent.
  • These covers 10 are part of a plate 11, which rests from the inside against the relevant end wall 6 and 7 and is held by screws 13 on the relevant end wall.
  • the End walls 6 and 7 have corresponding elongated holes 12 through which the screws 13 pass.
  • the function of the air passages 9 is discussed in more detail below.
  • Fig. 2 shows the toothed roller 1 and 2 (both rollers are identical) in section, namely along the line II-II in Fig. 1.
  • the toothed roller 1 and 2 is supported by the shaft 14, by means of the Core 15, which is secured against the skins 14 by means of the wedges 16.
  • the support plates 17 and 18 are welded to the core 15 and at both ends, over the outer circumference of which the basket 19 with the teeth 3 and 4 growing out of it is drawn.
  • the basket 19 is axially secured on the support plates 17 and 18 by the end plates 6 and 7 and on the opposite side by the end plates 6a and 7a (not visible in FIG. 1).
  • the screws 20, 21 are screwed into the end faces of the basket 19 through the end plates 6, 7 and 6a, 7a.
  • the end plates 6, 7 and 6a, 7a protrude beyond the outer edge of the support plates 17 and 18 and hold them in an annular groove.
  • the basket 19 formed by the tooth bases in each case has axial slots 22 between the teeth 3, 4, so that air or radial air can escape from the interior 8 of each toothed roller 1 or 2.
  • toothed rollers 1 and 2 are set in rotation, with open passages 9, an air flow forms in the end walls 6, 7, 6a, 7a into the interior 8 and out of it through the slots 22, since the toothed rollers 1 and 2 act as a radial fan wheel, which sucks in air centrally and blows radially outwards in the area of the outer circumference.
  • the strength of this flow depends on the one hand on the speed of the Tooth rollers 1 and 2, also from the degree of opening of the air passages 9, which, as explained above in connection with FIG. 1, can be set optionally.
  • Air is sucked in independently of one another through both toothed rollers 1 and 2 and blown out through the slots 22.
  • the air stream exiting through the slots 22 blows the threads 5 away from the teeth after they have left the area of the meshing of the teeth 3 and 4. Since this is done symmetrically, the threads 5 are blown evenly from both sides and can fall down freely.
  • the exit speed of the threads 5 from the pair of rollers 1 and 2 initially corresponds to the peripheral speed of the rollers minus any possible small slip.
  • the speed of the threads 5 is initially maintained after the roller clamping or friction has been released by the inertia, the threads 5 fall down at this speed and can be picked up by a conveyor belt shortly thereafter.
  • Fig. 3 shows an apparatus for producing spunbonded fabric using the two toothed rollers 1 and 2, which are shown only schematically here.
  • the up in a known manner
  • Built spinning head 23 contains a melt or solution stream from a corresponding source, which is pushed through holes in the spinnerets 24 at a uniform flow rate, whereby the threads 5 are formed.
  • the threads 5 are cooled by the cross-flowing air and thereby solidified.
  • a vibration knot roller 26 ensures that the threads 5 thus formed cannot swing back and forth too much.
  • the pair of toothed rollers 1 and 2 Arranged under the vibration knot roller 26 is the pair of toothed rollers 1 and 2, which, by combing their teeth, pull the threads 5 from the top of the spinneret 24 and release them downwards so that they fall onto the conveyor belt 27.
  • the suction box 29 is arranged below the conveyor belt 27 and sucks the threads 5 or the fleece 28 onto the air-permeable conveyor belt 27 with the vacuum therein.
  • the conveyor belt 27 then conveys the fleece 28 as a flat structure into an aftertreatment section, not described above.
  • FIG. 4 shows the device according to FIG. 3 in a side view, from which it can be seen that a band of considerable width of threads 5 can be pulled off by the toothed rollers 1 and 2 and placed on the conveyor belt 27.
  • the two dash-dotted lines drawn from top to bottom through the device indicate that the device can also be made wider or narrower.
  • the draw-off and stretching rollers 30 are connected between the Elass shaft 25 and the two toothed rollers 1 and 2, each of which follows runs at the same or greater peripheral speed than the previous one.
  • the rollers 30 can also be heated to certain polymer-specific temperatures. This allows the threads 5 to be stretched in an adjustable manner, so that the threads released by the last of the rollers 30 obtain the desired tensile strength and other properties. From the last of the rollers 30 running at high peripheral speed, the threads 5 are drawn off by the pair of the two tooth rollers 1 and 2, whereby, as described in relation to FIG. 3, winding of the threads onto one of the tooth rollers 1 and 2 is avoided, so that the threads 5, as described with reference to FIGS. 3 and 4, are placed on the conveyor belt 27 and transported for further processing.
  • FIG. 6 shows the arrangement according to FIG. 5 in a front view.
  • a further organ is installed, namely the device 31 for electrostatically charging the threads 5.
  • the device 31 for electrostatically charging the threads 5. It is a known high-voltage device by means of which the threads 5 are statically charged so that they are mutually dependent repel.
  • the electrostatic charging of the threads 5 is retained even when passing through the toothed rollers 1 and 2, since in this case their teeth are provided with a sufficiently thick insulation layer.
  • the electrostatic charge then ensures that after leaving the toothed rollers 1 and 2, the threads 5 spread apart, so that they lie on the conveyor belt 27 with a substantially greater width than the width of the thread belt in the region of the toothed rollers 1 and 2.
  • the density of the Fleece reduced on the conveyor belt 27, on the other hand there is also a particularly uniform distribution of the individual threads on the conveyor belt 27.
  • the device 31 for electrostatic charging can also be attached to the arrangement according to FIGS. 3 and 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

Procédé pour obtenir des non-tissés à partir de polymères synthétiques, selon lequel les fils constituant le non-tissé, après la filature et le refroidissement, sont déposés en large chaîne de fils sur une surface en mouvement, par exemple sur une bande de transport. Avant d'être amenés sur la surface en mouvement, les fils sont soumis à l'action de rouleaux à dents sans contact direct, qui les peignent dans le but de les distribuer de façon uniforme dans la direction axiale des rouleaux et qui les soumettent à des ondulations et simultanément à une extension.
PCT/DE1989/000176 1988-03-21 1989-03-21 Procede et dispositif pour produire des non-tisses Ceased WO1989009298A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3809450.9 1988-03-21
DE3809450 1988-03-21

Publications (1)

Publication Number Publication Date
WO1989009298A1 true WO1989009298A1 (fr) 1989-10-05

Family

ID=6350286

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1989/000176 Ceased WO1989009298A1 (fr) 1988-03-21 1989-03-21 Procede et dispositif pour produire des non-tisses

Country Status (1)

Country Link
WO (1) WO1989009298A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006071976A3 (fr) * 2004-12-27 2006-11-09 Du Pont Procede ameliore de formation de bande par electrosoufflage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1469292A (fr) * 1965-01-25 1967-02-10 Du Pont Procédé de fabrication de nappes de grandes largeurs en filaments continus
US3384944A (en) * 1965-02-10 1968-05-28 Du Pont Apparatus for extruding and blending
DE2803472A1 (de) * 1978-01-27 1979-08-02 Oltmanns Heinrich Fa Vorrichtung zum fortlaufenden herstellen einer wirrfasermatte, insbesondere einer wirrfasermatte fuer den wasserbau
EP0291032A2 (fr) * 1987-05-13 1988-11-17 Wannagat, Horst Procédé et appareil pour condenser et consolider une natte

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1469292A (fr) * 1965-01-25 1967-02-10 Du Pont Procédé de fabrication de nappes de grandes largeurs en filaments continus
US3384944A (en) * 1965-02-10 1968-05-28 Du Pont Apparatus for extruding and blending
DE2803472A1 (de) * 1978-01-27 1979-08-02 Oltmanns Heinrich Fa Vorrichtung zum fortlaufenden herstellen einer wirrfasermatte, insbesondere einer wirrfasermatte fuer den wasserbau
EP0291032A2 (fr) * 1987-05-13 1988-11-17 Wannagat, Horst Procédé et appareil pour condenser et consolider une natte

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006071976A3 (fr) * 2004-12-27 2006-11-09 Du Pont Procede ameliore de formation de bande par electrosoufflage
US7585451B2 (en) 2004-12-27 2009-09-08 E.I. Du Pont De Nemours And Company Electroblowing web formation process

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