EP1953275B1 - Drafting device with fibre condensing zone - Google Patents
Drafting device with fibre condensing zone Download PDFInfo
- Publication number
- EP1953275B1 EP1953275B1 EP08000342A EP08000342A EP1953275B1 EP 1953275 B1 EP1953275 B1 EP 1953275B1 EP 08000342 A EP08000342 A EP 08000342A EP 08000342 A EP08000342 A EP 08000342A EP 1953275 B1 EP1953275 B1 EP 1953275B1
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- EP
- European Patent Office
- Prior art keywords
- fibre assembly
- guide surfaces
- fiber structure
- bottom roller
- condenser component
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
- D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
- D01H5/70—Constructional features of drafting elements
- D01H5/72—Fibre-condensing guides
Definitions
- the invention relates to a drafting system for warping staple fibers with a drivable lower roller, the lower roller being associated with two pressure rollers, being provided in a compression zone between the two pressure rollers mechanical means for compressing a warped in the drafting fiber structure, and wherein in the compression zone transport means for supporting of the fiber structure to be compressed are provided between the nip lines of the two pressure rollers.
- the invention further relates to a compressor component for a staple fiber distorting drafting system with a concave cylindrical jacket-shaped support surface for a lower roller of the drafting system, and with mechanical means for compressing a distorted in the drafting fiber structure, wherein the means for compressing at least two spaced-apart guide surfaces containing, directly to the Adjacent bearing surface.
- a drafting and a compressor component of this type are by the WO 2006/005207 A1 State of the art.
- the known means for compressing are formed as a compression channel.
- the compression channel tapers in the transport direction of the fiber structure.
- the side surfaces of the compression channel form guide surfaces which lie on both sides of the fiber structure and whose distance is reduced in the transport direction of the fiber structure more and more.
- the fiber structure is thereby compacted and compacted.
- Different types of compression channels are described. What is common to all the compression channels is that the width of the compression channel in the end area determines the degree of compaction of the fiber structure.
- the distance of the lateral guide surfaces to each other must therefore be very small in order to compact the fiber structure sufficiently. It is usually only a few tenths of a millimeter.
- Blockages can be through Thick areas of the fiber structure to be compacted and, above all, in the processing of natural fibers such as cotton, are caused by shell parts or nits.
- the invention is based on the object to improve the means for compressing the distorted fiber structure and to reduce the tendency to clog.
- the object is achieved in the drafting system according to claim 1, characterized in that the means for compacting contain at least one guide surface with which the fiber structure in the axial direction of the lower roller is deflected by at least the amount of its width from its transport direction.
- the object is achieved in that the two guide surfaces - seen in the circumferential direction of the cylinder jacket-shaped bearing surface - have a distance from one another.
- the inventive design can be dispensed with a compression channel whose width must be matched to the width of the compressed fiber structure and which is very narrow due to its.
- the guide surfaces cause a deflection of the fiber structure transverse to its transport direction.
- An obliquely arranged to the transport direction of the fiber strand guide surface causes a compression and rolling of the fiber strand without an opposite guide surface would be required, which forms a narrow channel with the first guide surface.
- the inclined guide surface also acts alone as a deflection for the fiber structure. External and protruding fibers are applied and the fiber structure becomes very compact. When twisting the dreaded so-called "spinning triangle" then practically no longer occurs, so that the resulting yarn has a higher strength and a lower hairiness.
- the means for compaction contain at least two guide surfaces, which are arranged on gegenübrip sides of the fiber structure.
- the fiber structure is characterized by the guide surfaces successively deflected in different axial directions of the lower roller from its transport direction. The fiber structure is thereby deflected twice, whereby a very good compaction effect can be achieved.
- several guide surfaces can be provided, which redirect the fiber structure several times.
- the distance from each other is greater than the width of the compressed fiber structure.
- the smallest distance is preferred between two guide surfaces even a multiple larger than the width of the compressed fiber structure, for example, at least twice as large.
- the compaction effect is no longer determined by the distance of the guide surfaces to each other, but by the deflection of the fiber structure from its transport direction.
- the distance between the guide surfaces to each other can therefore be chosen so large without affecting the compaction effect that even thick spots in the fiber structure or possibly containing nits or shell parts can no longer clog the compressor component.
- a good compaction effect is achieved when the two guide surface are arranged on the compressor component so that along the cylinder jacket-shaped bearing surface of the compressor component exists an imaginary circumferential line which is cut by both guide surfaces.
- the transport means for supporting the fiber structure to be compressed preferably supports the fiber structure uninterrupted in the entire compression zone.
- the transport means is formed by the outer periphery of the lower roller on which the compressor component rests.
- a good compaction effect can be achieved if the fiber structure in the compression zone is subject to a slight tensioning distortion.
- the Anspannveryak causes the fiber structure fits very well to the trained as deflection edges guide surfaces, as the individual, under tension staple fibers of the fiber structure have the desire to cover the shortest path between the two clamping lines.
- a slight tensioning distortion of the fiber structure in the compression zone can be achieved, for example, by different hardnesses of the elastic covers of the two pressure rollers and different degrees of contact pressure.
- the reference of the pressure roller after the compression zone is softer than the reference of the pressure roller before the compression zone.
- the pressure roller can be pressed after the compression zone with a lower pressure force against the lower roller.
- the means for compressing are coupled to a traversing device of the drafting system, which alternates the fiber structure with a slow movement transversely to the transport direction.
- each fiber structure at least one guide surface is provided which compresses the fiber strand separately, without connecting to the other fiber composites.
- the compressor component advantageously contains at least two guide surfaces for each fiber structure.
- the guide surfaces are advantageously arranged so that the distances of the fiber composites are reduced in the compression zone, so that at the downstream of the compression zone nip the fiber composites are brought together to a small distance which is sufficient to keep the compacted fiber bundles separated.
- FIG. 1 shown drafting system 1 consists essentially of drivable lower rollers 2, 4, 6 which pressable pressure rollers 3, 5, 7 are assigned and forgiven a fiber strand 8 of staple fibers in the transport direction A to the desired fineness.
- the fiber structure 8 is supplied to the drafting system 1 in the form of a fiber structure or a fuse by a Lunten culinary 9 and can be performed during the delay in a conventional manner by witnessessriemchen 10 and 11.
- the delay of the fiber structure 8 is completed.
- the finished warped fiber structure 13 passes through then a compression zone 14 in which it is compacted and compacted.
- the compression zone 14 is bounded on the outlet side by a clamping line 15, which is formed by a second, the lower roller 6 associated pressure roller 16. Following the nip line 15, the fiber structure 13 is given its rotation and there is the finished thread 17th
- the drafting system 1 may be part of a spinning machine, in which the thread 17 is given its rotation, for example by an air nozzle or a ring spindle.
- a plurality of drafting units 1 are arranged side by side and the lower rollers 2, 4, 6 are formed as continuous in the machine longitudinal direction of the lower cylinder.
- FIG. 2 Such an embodiment is in FIG. 2 indicated.
- the pressure rollers 3, 5, 7 and 16 omitted.
- the pressure rollers of two adjacent drafting systems can be designed in a known manner with a common axis as Druckwalzenzwilling.
- a compressor component 18 is arranged, which further below described means 28 for compressing the warped fiber structure 13 contains.
- the fiber structure 13 is supported in the compression zone 14 by means of transport 19, since the finished warped, but still untwisted fiber structure 13 has almost no stability.
- the transport means 19 are formed by the outer periphery of the lower roller 6, which transports the fiber structure 13 from the nip line 12 to the nip 15.
- the fiber structure 13 lies between the nip lines 12 and 15 constantly on the transport means 19 and is not lifted from the lower roller 6.
- the compressor component 18 includes a concave cylindrical jacket-shaped bearing surface 20 with which the compressor component 18 rests on the lower roller 6.
- the compressor component 18 is preferably held with the pressure rollers 7 and 16 in a pressure roller assembly 21 designed as a compact unit and guided so that it does not touch the pressure rollers 7 and 16.
- the pressure roller assembly 21 is held in a manner not shown by a load carrier of the drafting system 1. So that the compressor component 18 rests well with its bearing surface 20 on the lower roller 6, the compressor component 18 may be associated, for example, with a spring 22 or a magnet 23. Due to the sliding movement between bottom roller 6 and compressor component 8, it is advantageous to choose a wear-resistant material pairing.
- the lower roller 6 is usually made of hardened steel and may additionally have a coating.
- the compressor component 18 may preferably consist of ceramic. However, it may also be advantageous, the compressor component 18 at least on the support surface 18 of a abrasion-resistant composite material which is softer than the surface of the lower roller 6. If necessary, a worn compressor member 18 can be replaced more easily than a worn lower roller 6. As a composite material for the compressor member 18, a glass fiber reinforced plastic is well suited, since the compressor member can then be produced very simply and inexpensively as an injection molded part. Regardless of the selected material of the compressor component 18, it may be favorable to add to the material of the support surface 20 friction-reducing additives, for example in the form of inclusions of polytetrafluoroethylene.
- the traversing device 24 includes a Lunten réelleschiene 25 coupled to a drive with which the Lunten réelle 9 can be moved transversely to the transport direction A back and forth, as in FIG. 2 indicated by the double arrow B. So that now the compressor component 18 is always optimally positioned to the fiber structure 13 and thus the service life of the pressure roller 16 is increased, the compressor component 18 is preferably coupled to the traversing device 24.
- the coupling can be achieved, for example, by connecting the compressor component 18 to the sliver guide rail 25 via a fork 26 and a connecting arm 27.
- the fork 26 can consciously embrace the connecting arm 27 with some play or be sprung without play. Due to the fork 26, the pressure roller assembly 21 can be solved when swinging the load carrier of the drafting without hindrance from the connecting arm 27 and lift off from the lower roller 6. When replacing the pressure roller assembly 21, the fork 26 automatically engages again in the connecting arm 27 and positions the compressor component 18 according to the position of the Lunten concernss. 9
- the compressor component 18 with the means 28 for compressing the fiber structure 13 in the compression zone 14 will be described below with reference to the enlarged view of FIG. 3 described.
- the means 28 for compression by two guide surfaces 29 and 30 are formed.
- the guide surfaces 29 and 30 are arranged obliquely to the transport direction A and deflect the fiber structure 13 in the axial direction of the lower roller 6.
- the guide surfaces 29 and 30, even if they are arranged on opposite sides of the fiber structure 13, act differently than the guide surfaces on the known compressor components of the aforementioned prior art.
- the guide surfaces on the known compressor component compress the fiber structure 13 simultaneously from both sides, so that between the guide surfaces a narrow compression channel which determines the degree of compaction and at the same time is very susceptible to blockage.
- the guide surfaces 29 and 30 in the present compressor module 18 are arranged so that the fiber structure 13 from the guide surfaces 29, 30 successively in different axial directions of the lower roller 6 can be deflected from its transport direction A.
- the fiber structure 13 first reaches the guide surface 29 and is of this in the illustration after FIG. 3 deflected to the left from its transport direction A. After the fiber structure 13 has left the guide surface 29, it reaches the guide surface 30 and is deflected by this again to the right.
- This "zigzag deflection" of the fiber structure 13 is achieved in that the two guide surface 29 and 30 - seen in the circumferential direction of the lower roller 6 and the cylinder jacket-shaped support surface 20 - have a distance C to each other, that are arranged sequentially.
- the smallest distance D of the two guide surfaces 29 and 30 has no influence on the width E of the compressed fiber structure 13.
- the distance D can therefore be chosen to be much greater than the width E of the fiber structure 13 at the nip 15, so that even in the fiber structure 13th present thick spots, nits or shell parts, the means 28 can easily pass for compacting and the compressor component 18 thereby not clogged. Blockages can be effectively prevented, in particular, if the distance D is greater than the width F of the warped fiber structure 13 at the nip line 12.
- An essential measure of the compaction effect is the inclination angle of the guide surfaces 29 and 30 with respect to the transport direction A and the deflection of the fiber structure 13 in the axial direction of the lower roller 6.
- the deflection of the fiber structure 13 transversely to its transport direction A is at least the amount of its width F on the nip line 12.
- the compression can be supported by an appropriate choice of the angle ⁇ between the guide surface 30 and the support surface 20.
- the guide surface 30 is directly adjacent to the support surface 20.
- the guide surface 30 may be arranged perpendicular to the support surface 20 and to the surface of the lower roller 6.
- the fiber structure 13, which rests on the transport means 19 is pressed into the corner between the guide surface 30 and transport means 19 and compacted there. There is no further surface on the compressor component 18, on which the fiber structure 13 rests. to Changing the compression effect, the angle ⁇ and values smaller or greater than 90 °.
- a web 38 may be provided on the compressor component 18, which extends above the transport means 19 of the guide surface 30 on one side of the fiber structure 13 to the other side of the fiber structure 13.
- the web 38 practically establishes a connection between the guide surfaces 29 and 30, so that the compressor component 18 is in one piece.
- the web 38 is no longer involved in the compression of the fiber structure 13.
- the compressor component 18 can therefore no longer be lifted off the lower roller 6 by a thick point in the fiber structure 13 and pressed against the upper roller 16.
- the height H of the guide surface 30, and of course in a manner not shown also the guide surface 29, is therefore preferably greater than the width E of the compressed fiber structure thirteenth
- the guide surface 29 can also be continued by the dashed contour 32 of the compressor component 18. Although between the contour 32 and the guide surface 30 is formed with the web 38 a kind of channel, but this channel is not involved in the compression effect of the compressor component 18. First, the guide surface 29 ends in any case at the deflection edge 33, whereby the fiber structure 13 does not come into contact with the contour 32 at all. Second, the distance D and the height H are much too large to cause compaction of the fiber structure 13.
- the tensile stress acting on the fiber structure 13 in the compression zone 14 can be influenced.
- a slight tensioning distortion in the fiber structure 13 can be produced, which can improve the compression.
- a slight tension in the fiber structure 13 this has the endeavor in the compression zone 14 to take the shortest possible route.
- the fiber structure 13 applies under slight tension to the deflection edge 33 of the guide surface 29 and the deflection edge 34 of the guide surface 30 and is optimally compressed.
- the distance between the two clamping lines 12 and 15 is as small as possible, in particular smaller than the mean fiber length of the staple fibers in the fiber structure 13.
- the diameter of the pressure roller 16 can be reduced.
- the service life of the pressure roller 16 is not too small with a smaller diameter and thus also prevents the Fiber wrap 13 wrapped around the pressure roller 16, the pressure roller 16 as in FIG. 1 indicated to be associated with a protective apron 35.
- the protective apron 35 wraps around the pressure roller 16 and is guided above the pressure roller via a guiding and / or tensioning device 36, which can likewise be attached to the pressure roller assembly 21.
- the zigzag deflection of the fiber structure 13 can be extended and thereby the compression can be improved.
- a curl occurring in the deflection of the fiber structure from its transport direction A can be utilized to densify the fiber structure 13. The slight rolling movement about the longitudinal axis of the fiber structure 13 occurs because the transport means 19 continues to move exactly in the transport direction A, even if the fiber structure 13 is displaced transversely to the transport direction A by the inclined guide surface 30.
- FIG. 5 a variant of a compressor component 18 is shown, which can be used for the production of false twist 37.
- two fiber assemblies 13 are warped separately from each other in a drafting 1 and performed separately through the compression zone 14.
- the two fiber composites 13 are fed to a common twist element and spun into a dummy thread 37.
- the means 28 for compressing the apparent component compressor component 18 are basically constructed in the same way as described above for a single fiber assembly 13.
- Like reference numerals designate like parts. A renewed description of all details can therefore be dispensed with at this point.
- the compactor component 18 for false twist 37 has at least two guide surfaces 29, 30 for each fiber strand 13.
- the guide surfaces 29, 30 for the two fiber composites 13 are advantageously arranged mirror-symmetrically in a manner such that the distance of the two fiber composites 13 from the nip line 12 to the nip 15 is reduced.
- the two fiber composites 13 should have at the nip 15 only a very small distance from each other, which is sufficient to keep the two compacted fiber composites 13 separated.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Or Twisting Of Yarns (AREA)
- Preliminary Treatment Of Fibers (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Auxiliary Devices For And Details Of Packaging Control (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Nonwoven Fabrics (AREA)
Abstract
Description
Die Erfindung betrifft ein Streckwerk zum Verziehen von Stapelfasern mit einer antreibbaren Unterwalze, wobei der Unterwalze zwei Druckwalzen zugeordnet sind, wobei in einer Verdichtungszone zwischen den beiden Druckwalzen mechanische Mittel zum Verdichten eines im Streckwerk verzogenen Faserverbandes vorgesehen sind, und wobei in der Verdichtungszone Transportmittel zum Unterstützen des zu verdichtenden Faserverbandes zwischen den Klemmlinien der beiden Druckwalzen vorgesehen sind.The invention relates to a drafting system for warping staple fibers with a drivable lower roller, the lower roller being associated with two pressure rollers, being provided in a compression zone between the two pressure rollers mechanical means for compressing a warped in the drafting fiber structure, and wherein in the compression zone transport means for supporting of the fiber structure to be compressed are provided between the nip lines of the two pressure rollers.
Die Erfindung betrifft ferner ein Verdichterbauteil für ein Stapelfasern verziehendes Streckwerk mit einer konkaven zylindermantelförmigen Auflagefläche für eine Unterwalze des Streckwerks, und mit mechanischen Mitteln zum Verdichten eines im Streckwerk verzogenen Faserverbandes, wobei die Mittel zum Verdichten wenigstens zwei voneinander beanstandete Führungsflächen enthalten, die unmittelbar an die Auflagefläche angrenzen.The invention further relates to a compressor component for a staple fiber distorting drafting system with a concave cylindrical jacket-shaped support surface for a lower roller of the drafting system, and with mechanical means for compressing a distorted in the drafting fiber structure, wherein the means for compressing at least two spaced-apart guide surfaces containing, directly to the Adjacent bearing surface.
Ein Streckwerk und ein Verdichterbauteil dieser Art sind durch die
Aus
Der Erfindung liegt die Aufgabe zu Grunde, die Mittel zum Verdichten des verzogenen Faserverbandes zu verbessern und die Verstopfungsneigung zu verringern.The invention is based on the object to improve the means for compressing the distorted fiber structure and to reduce the tendency to clog.
Die Aufgabe wird beim Streckwerk gemäß Anspruch 1 dadurch gelöst, dass die Mittel zum Verdichten wenigstens eine Führungsfläche enthalten, mit der der Faserverband in axialer Richtung der Unterwalze um wenigstens den Betrag seiner Breite aus seiner Transportrichtung ablenkbar ist. Bei dem Verdichterbauteil wird die Aufgabe dadurch gelöst, dass die beiden Führungsflächen - in Umfangsrichtung der zylindermantelförmigen Auflagefläche gesehen - einen Abstand zueinander aufweisen.The object is achieved in the drafting system according to
Durch die erfindungsgemäße Ausgestaltung kann auf einen Verdichtungskanal verzichtet werden, dessen Breite auf die Breite des verdichteten Faserverbandes abgestimmt sein muss und der aufgrund dessen sehr schmal ist. Die Führungsflächen bewirken eine Ablenkung des Faserverbandes quer zu seiner Transportrichtung. Eine schräg zur Transportrichtung des Faserverbandes angeordnete Führungsfläche bewirkt eine Verdichtung und Einrollung des Faserverbandes, ohne dass eine gegenüberliegende Führungsfläche erforderlich wäre, die mit der ersten Führungsfläche einen engen Kanal bildet. Die schräge Führungsfläche wirkt auch allein als Umlenkkante für den Faserverband. Außenliegende und abstehende Fasern werden dadurch angelegt und der Faserverband wird sehr kompakt. Bei der Drallerteilung tritt dann das gefürchtete sogenannte "Spinndreieck" praktisch nicht mehr auf, so dass das entstehende Garn eine höhere Festigkeit und eine geringere Haarigkeit aufweist.The inventive design can be dispensed with a compression channel whose width must be matched to the width of the compressed fiber structure and which is very narrow due to its. The guide surfaces cause a deflection of the fiber structure transverse to its transport direction. An obliquely arranged to the transport direction of the fiber strand guide surface causes a compression and rolling of the fiber strand without an opposite guide surface would be required, which forms a narrow channel with the first guide surface. The inclined guide surface also acts alone as a deflection for the fiber structure. External and protruding fibers are applied and the fiber structure becomes very compact. When twisting the dreaded so-called "spinning triangle" then practically no longer occurs, so that the resulting yarn has a higher strength and a lower hairiness.
Es ist vorteilhaft, dass die Mittel zum Verdichten wenigstens zwei Führungsflächen enthalten, die auf gegenübliegenden Seiten des Faserverbandes angeordnet sind. Der Faserverband ist dadurch von den Führungsflächen nacheinander in unterschiedliche axiale Richtungen der Unterwalze aus seiner Transportrichtung ablenkbar. Der Faserverband wird dadurch zweimal umgelenkt, wodurch eine sehr gute Verdichtungswirkung erreichbar ist. Je nach Anforderungen können selbstverständlich auch mehrere Führungsflächen vorgesehen werden, die den Faserverband mehrfach umlenken.It is advantageous that the means for compaction contain at least two guide surfaces, which are arranged on gegenübliegenden sides of the fiber structure. The fiber structure is characterized by the guide surfaces successively deflected in different axial directions of the lower roller from its transport direction. The fiber structure is thereby deflected twice, whereby a very good compaction effect can be achieved. Depending on the requirements, of course, several guide surfaces can be provided, which redirect the fiber structure several times.
Selbst wenn zwei oder mehr Führungsflächen vorgesehen sind, ist deren Abstand zueinander jeweils größer als die Breite des verdichteten Faserverbandes. Bevorzugt ist der kleinste Abstand zwischen zwei Führungsflächen sogar ein Mehrfaches größer als die Breite des verdichteten Faserverbandes, beispielsweise wenigstens doppelt so groß. Die Verdichtungswirkung wird nicht mehr durch den Abstand der Führungsflächen zueinander bestimmt, sondern durch die Ablenkung des Faserverbandes aus seiner Transportrichtung. Der Abstand der Führungsflächen zueinander kann deshalb ohne Beeinträchtigung der Verdichtungswirkung so groß gewählt werden, dass auch Dickstellen im Faserverband oder eventuell enthaltende Nissen oder Schalenteile das Verdichterbauteil nicht mehr verstopfen können.Even if two or more guide surfaces are provided, their distance from each other is greater than the width of the compressed fiber structure. The smallest distance is preferred between two guide surfaces even a multiple larger than the width of the compressed fiber structure, for example, at least twice as large. The compaction effect is no longer determined by the distance of the guide surfaces to each other, but by the deflection of the fiber structure from its transport direction. The distance between the guide surfaces to each other can therefore be chosen so large without affecting the compaction effect that even thick spots in the fiber structure or possibly containing nits or shell parts can no longer clog the compressor component.
Eine gute Verdichtungswirkung wird erreicht, wenn die beiden Führungsfläche am Verdichterbauteil so angeordnet sind, dass entlang der zylindermantelförmigen Auflagefläche des Verdichterbauteils eine gedachte Umfangslinie existiert, die von beiden Führungsflächen geschnitten wird.A good compaction effect is achieved when the two guide surface are arranged on the compressor component so that along the cylinder jacket-shaped bearing surface of the compressor component exists an imaginary circumferential line which is cut by both guide surfaces.
Das Transportmittel zum Unterstützen des zu verdichtenden Faserverbandes unterstützt vorzugsweise den Faserverband in der gesamten Verdichtungszone unterbrechungsfrei. Das Transportmittel wird durch den Außenumfang der Unterwalze gebildet, auf der das Verdichterbauteil aufliegt.The transport means for supporting the fiber structure to be compressed preferably supports the fiber structure uninterrupted in the entire compression zone. The transport means is formed by the outer periphery of the lower roller on which the compressor component rests.
Eine gute Verdichtungswirkung kann erreicht werden, wenn der Faserverband in der Verdichtungszone einem leichten Anspannverzug unterliegt. Der Anspannverzug bewirkt, dass sich der Faserverband sehr gut an die als Umlenkkanten ausgebildeten Führungsflächen anlegt, da die einzelnen, unter Zug stehenden Stapelfasern des Faserverbandes das Bestreben haben, den kürzesten Weg zwischen den beiden Klemmlinien zurückzulegen. Ein leichter Anspannverzug des Faserverbandes in der Verdichtungszone lässt sich beispielsweise durch unterschiedliche Härten der elastischen Bezüge der beiden Druckwalzen und unterschiedlich starke Anpresskräfte erreichen. Bevorzugt ist der Bezug der Druckwalze nach der Verdichtungszone weicher als der Bezug der Druckwalze vor der Verdichtungszone. Außerdem kann die Druckwalze nach der Verdichtungszone mit einer geringeren Andruckkraft gegen die Unterwalze gedrückt werden.A good compaction effect can be achieved if the fiber structure in the compression zone is subject to a slight tensioning distortion. The Anspannverzug causes the fiber structure fits very well to the trained as deflection edges guide surfaces, as the individual, under tension staple fibers of the fiber structure have the desire to cover the shortest path between the two clamping lines. A slight tensioning distortion of the fiber structure in the compression zone can be achieved, for example, by different hardnesses of the elastic covers of the two pressure rollers and different degrees of contact pressure. Preferably, the reference of the pressure roller after the compression zone is softer than the reference of the pressure roller before the compression zone. In addition, the pressure roller can be pressed after the compression zone with a lower pressure force against the lower roller.
Zur Verlängerung der Lebensdauer der Druckwalzen ist es vorteilhaft, dass die Mittel zum Verdichten mit einer Changiereinrichtung des Streckwerks gekoppelt sind, die den Faserverband mit einer langsamen Bewegung quer zur Transportrichtung changiert.To extend the life of the pressure rollers, it is advantageous that the means for compressing are coupled to a traversing device of the drafting system, which alternates the fiber structure with a slow movement transversely to the transport direction.
Werden in einem Streckwerk mehrere Faserverbände verzogen, wie es beispielsweise bei der Herstellung von Scheinzwirn geschieht, so ist es vorteilhaft, dass für jeden Faserverband wenigstens eine Führungsfläche vorgesehen ist, die den Faserverband separat verdichtet, ohne dass er sich mit den anderen Faserverbänden verbindet. Das Verdichterbauteil enthält hierzu vorteilhaft wenigstens zwei Führungsflächen für jeden Faserverband. Die Führungsflächen sind vorteilhafterweise so angeordnet, dass sich die Abstände der Faserverbände in der Verdichtungszone verringern, so dass an der der Verdichtungszone nachgeordneten Klemmlinie die Faserverbände bis auf einen geringen Abstand zusammengeführt werden, der ausreicht, um die verdichteten Faserverbände getrennt zu halten.If several fiber composites are warped in a drafting system, as occurs, for example, in the production of false twist, it is advantageous that for each fiber structure at least one guide surface is provided which compresses the fiber strand separately, without connecting to the other fiber composites. The compressor component advantageously contains at least two guide surfaces for each fiber structure. The guide surfaces are advantageously arranged so that the distances of the fiber composites are reduced in the compression zone, so that at the downstream of the compression zone nip the fiber composites are brought together to a small distance which is sufficient to keep the compacted fiber bundles separated.
Weitere Vorteile und Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung einiger Ausführungsbeispiele.Further advantages and features of the invention will become apparent from the following description of some embodiments.
Es zeigen:
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eine teilweise geschnittene Seitenansicht eines Streckwerks mit einem erfindungsgemäßen Verdichterbauteil,Figur 1 -
Figur 2 eine schematische Draufsicht in Richtung des Pfeiles II auf das Streckwerk der , bei der die Druckwalzen weggelassen sind,Figur 1 -
eine stark vergrößerte Ansicht in Richtung des Pfeils III derFigur 3 auf das Verdichterbauteil,Figur 1 -
eine entlang der Schnittfläche IV-IV derFigur 4 geschnittene Ansicht des Verdichterbauteils,Figur 3 -
eine AnsichtFigur 5ähnlich Figur 3 auf eine Variante eines Verdichterbauteils für Scheinzwirn.
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FIG. 1 a partially sectioned side view of a drafting system with a compressor component according to the invention, -
FIG. 2 a schematic plan view in the direction of arrow II on the drafting of theFIG. 1 in which the pressure rollers are omitted, -
FIG. 3 a greatly enlarged view in the direction of arrow III ofFIG. 1 on the compressor component, -
FIG. 4 one along the section IV-IV ofFIG. 3 sectional view of the compressor component, -
FIG. 5 a view similarFIG. 3 to a variant of a compressor component for false twist.
Das in
Das Streckwerk 1 kann Teil einer Spinnmaschine sein, in der dem Faden 17 seine Drehung beispielsweise durch eine Luftdüse oder eine Ringspindel erteilt wird. Im Falle einer Ringspinnmaschine ist eine Vielzahl von Streckwerken 1 nebeneinander angeordnet und die Unterwalzen 2, 4, 6 sind als in Maschinenlängsrichtung durchlaufende Unterzylinder ausgebildet. Eine derartige Ausführung ist in
In der Verdichtungszone 14 ist ein Verdichterbauteil 18 angeordnet, das weiter unten noch näher beschriebene Mittel 28 zum Verdichten des verzogenen Faserverbandes 13 enthält. Der Faserverband 13 wird in der Verdichtungszone 14 durch Transportmittel 19 unterstützt, da der fertig verzogene, aber noch ungedrehte Faserverband 13 nahezu keine Stabilität aufweist. Die Transportmittel 19 werden durch den Außenumfang der Unterwalze 6 gebildet, die den Faserverband 13 von der Klemmlinie 12 bis zur Klemmlinie 15 transportiert. Der Faserverband 13 liegt dabei zwischen den Klemmlinien 12 und 15 ständig auf dem Transportmittel 19 auf und wird nicht von der Unterwalze 6 abgehoben.In the
Das Verdichterbauteil 18 enthält eine konkave zylindermantelförmige Auflagefläche 20 mit der das Verdichterbauteil 18 auf der Unterwalze 6 aufliegt. Das Verdichterbauteil 18 wird bevorzugt mit den Druckwalzen 7 und 16 in einem als kompakte Baueinheit gestalteten Druckwalzenaggregat 21 gehalten und so geführt, dass es die Druckwalzen 7 und 16 nicht berührt. Das Druckwalzenaggregat 21 wird in nicht näher dargestellter Weise von einem Belastungsträger des Streckwerks 1 gehalten. Damit das Verdichterbauteil 18 mit seiner Auflagefläche 20 gut auf der Unterwalze 6 aufliegt, kann dem Verdichterbauteil 18 beispielsweise eine Feder 22 oder ein Magnet 23 zugeordnet sein. Aufgrund der Gleitbewegung zwischen Unterwalze 6 und Verdichterbauteil 8 ist es vorteilhaft eine verschleißfeste Werkstoffpaarung zu wählen. Die Unterwalze 6 besteht üblicherweise aus gehärtetem Stahl und kann zusätzlich eine Beschichtung aufweisen. Das Verdichterbauteil 18 kann bevorzugt aus Keramik bestehen. Es kann jedoch auch vorteilhaft sein, das Verdichterbauteil 18 zumindest an der Auflagefläche 18 aus einem abriebfesten Verbundmaterial herzustellen, das weicher als die Oberfläche der Unterwalze 6 ist. Falls nötig, lässt sich ein verschlissenes Verdichterbauteil 18 leichter austauschen als eine verschlissene Unterwalze 6. Als Verbundmaterial für das Verdichterbauteil 18 ist ein glasfaserverstärkter Kunststoff gut geeignet, da sich das Verdichterbauteil dann sehr einfach und kostengünstig als Spritzgussteil herstellen lässt. Unabhängig vom gewählten Material des Verdichterbauteils 18 kann es günstig sein, dem Material der Auflagefläche 20 reibungsvermindernde Zusätze, beispielsweise in Form von Einlagerungen aus Polytetrafluorethylen, beizugeben.The
Zur Verlängerung der Lebensdauer der Druckwalzen 3, 5, 7 des Streckwerks 1 kann es vorteilhaft sein, eine Changiereinrichtung 24 vorzusehen. Die Changiereinrichtung 24 enthält eine mit einem Antrieb gekoppelte Luntenführerschiene 25 mit der die Luntenführer 9 quer zur Transportrichtung A hin und her bewegt werden können, wie es in
Das Verdichterbauteil 18 mit den Mitteln 28 zum Verdichten des Faserverbandes 13 in der Verdichtungszone 14 wird im Folgenden anhand der vergrößerten Darstellung der
Der kleinste Abstand D der beiden Führungsflächen 29 und 30 hat keinen Einfluss mehr auf die Breite E des verdichteten Faserverbandes 13. Der Abstand D kann deshalb wesentlich größer als die Breite E des Faserverbandes 13 an der Klemmlinie 15 gewählt werden, so dass auch im Faserverband 13 vorhanden Dickstellen, Nissen oder Schalenteile die Mittel 28 zum Verdichten problemlos passieren können und das Verdichterbauteil 18 dadurch nicht verstopft. Verstopfungen können insbesondere wirkungsvoll verhindert werden, wenn der Abstand D größer als die Breite F des verzogenen Faserverbandes 13 an der Klemmlinie 12 ist.The smallest distance D of the two
Wesentliches Maß für die Verdichtungswirkung ist der Neigungswinkel der Führungsflächen 29 und 30 in Bezug auf die Transportrichtung A und die Ablenkung des Faserverbandes 13 in axialer Richtung der Unterwalze 6. Die Ablenkung des Faserverbandes 13 quer zur seiner Transportrichtung A beträgt wenigstens den Betrag seiner Breite F an der Klemmlinie 12. So können alle über die Breite F verteilten Fasern des Faserverbandes 13 zusammengeführt werden. Unterstützt werden kann die Verdichtung durch eine entsprechende Wahl des Winkels α zwischen der Führungsfläche 30 und der Auflagefläche 20. In
In Ausgestaltung der Erfindung kann - wie in
Es sei darauf hingewiesen, dass aus fertigungstechnischen Gründen die Führungsfläche 29 auch durch die gestrichelt dargestellte Kontur 32 des Verdichterbauteils 18 fortgesetzt werden kann. Zwischen der Kontur 32 und der Führungsfläche 30 entsteht zwar mit dem Steg 38 eine Art Kanal, jedoch ist dieser Kanal nicht an der Verdichtungswirkung des Verdichterbauteils 18 beteiligt. Erstens endet die Führungsfläche 29 in jedem Fall an der Umlenkkante 33, wodurch der Faserverband 13 gar nicht mit der Kontur 32 in Berührung kommt. Zweitens ist der Abstand D und die Höhe H viel zu groß, um eine Verdichtung des Faserverbandes 13 zu bewirken.It should be noted that, for manufacturing reasons, the
Je nach Härte der elastischen Bezüge der Druckwalzen 7 und 16 und der Andruckkräfte der Druckwalze 7 und 16 an die Unterwalze 6 kann die auf den Faserverband 13 in der Verdichtungszone 14 wirkende Zugspannung beeinflusst werden. Durch einen weicheren Bezug an der Druckwalze 16 als an der Druckwalze 7 lässt sich ein leichter Anspannverzug im Faserverband 13 erzeugen, der die Verdichtung verbessern kann. Durch eine leichte Zugspannung im Faserverband 13 hat dieser das Bestreben in der Verdichtungszone 14 die kürzestmögliche Strecke einzunehmen. Der Faserverband 13 legt sich unter leichter Zugspannung an die Umlenkkante 33 der Führungsfläche 29 und die Umlenkkante 34 der Führungsfläche 30 an und wird optimal verdichtet. Bevorzugt ist der Abstand der beiden Klemmlinien 12 und 15 möglichst klein, insbesondere kleiner als die mittlere Faserlänge der Stapelfasern im Faserverband 13. Zur Verringerung des Abstandes der Klemmlinie 15 von der Klemmlinie 12 kann der Durchmesser der Druckwalze 16 verkleinert werden. Damit die Standzeit der Druckwalze 16 bei kleinerem Durchmesser nicht zu gering wird und damit auch verhindert wird, dass sich der Faserverband 13 um die Druckwalze 16 herumwickelt, kann der Druckwalze 16 wie in
In nicht dargestellter Ausgestaltung der Erfindung kann es vorteilhaft sein, auch mehr als die dargestellten zwei Führungsflächen 29 und 30 einzusetzen. Durch zusätzliche Führungsflächen kann die Zickzack-Umlenkung des Faserverbandes 13 verlängert und dadurch die Verdichtung verbessert werden. Je nach Fasermaterial und insbesondere bei geringem Anspannverzug in der Verdichtungszone 14 kann es auch ausreichend sein, lediglich eine Führungsfläche 30 mit der Umlenkkante 34 zur Verdichtung des Faserverbandes 13 einzusetzen. Insbesondere bei nur einer Führungsfläche 30 kann eine bei der Ablenkung des Faserverbandes aus seiner Transportrichtung A auftretende Einrollung ausgenutzt werden, um den Faserverband 13 zu verdichten. Die leichte Rollbewegung um die Längsachse des Faserverbandes 13 tritt auf, da sich das Transportmittel 19 weiterhin exakt in Transportrichtung A bewegt, auch wenn der Faserverband 13 von der schrägstehenden Führungsfläche 30 quer zur Transportrichtung A verschoben wird.In an unillustrated embodiment of the invention, it may be advantageous to use more than the illustrated two
In
Claims (14)
- A drafting arrangement (1) for drawing a fibre assembly (13) of staple fibres with a drivable bottom roller (6), two pressure rollers (7, 16) being associated with the bottom roller (6), mechanical means (28) for condensing the fibre assembly (13) drawn in the drafting arrangement (1) being provided in a condensing zone (14) between the two pressure rollers (7, 16), and the bottom roller (6) being provided in the condensing zone (14) as a conveying means (19) for supporting the fibre assembly (13) to be condensed between the clamping lines (12, 15) of the two pressure rollers (7, 16), characterised in that the condensing means (28) comprise at least one guide surface (29, 30) for the fibre assembly (13) resting on the circumference (19) of the bottom roller (6), which guide surface (29, 30) is arranged obliquely relative to the conveying direction (A) and which extends so far in the axial direction of the bottom roller (6) that the fibre assembly (13) may be deflected out of the conveying direction (A) in the axial direction of the bottom roller (6) by at least the amount of the width (F) with which it is conveyed to the guide surface (29, 30).
- A drafting arrangement according to claim 1, characterised in that the condensing means (28) comprise at least two guide surfaces (29, 30), the smallest spacing (D) between which is greater than the width (E) of the condensed fibre assembly (13).
- A drafting arrangement according to claim 1 or claim 2, characterised in that a guide surface (29, 30) is arranged on each of opposing sides of the fibre assembly (13), and in that the fibre assembly (13) may be deflected out of its conveying direction (A) in different axial directions of the bottom roller (6) by the guide surfaces (29, 30) one after the other.
- A drafting arrangement according to any one of claims 1 to 3, characterised in that the condensing means (28) are coupled to a traversing device (24) of the drafting arrangement (1).
- A drafting arrangement according to any one of claims 1 to 4, characterised in that a protective belt (35) is wrapped around at least one pressure roller (7; 16) .
- A condenser component (18) for a drafting arrangement (1) drawing a fibre assembly (13) of staple fibres, the condenser component comprising a concave bearing surface (20) in the shape of a cylinder envelope for the circumference of a bottom roller (6) of the drafting arrangement and at least one guide surface (29, 30) immediately adjoining the bearing surface (20), characterised in that the guide surface (29, 30) extends obliquely relative to the conveying direction (A) of the fibre assembly (13), in order to deflect the fibre assembly (13) resting on the circumference of the bottom roller out of the conveying direction (A) in the axial.direction of the bottom roller (6) by at least the width (F) with which it is conveyed to the guide surface (29, 30).
- A condenser component according to claim 6, characterised in that two guide surfaces (29, 30) inclined obliquely in opposite directions are provided, which are arranged one after the other in the circumferential direction with the spacing (C).
- A condenser component according to claim 7, characterised in that an imaginary circumferential line (31) exists on the bearing surface (20) in the shape of a cylinder envelope, which imaginary circumferential line (31) is intersected by the two guide surfaces (29, 30).
- A condenser component according to claim 8, characterised in that the circumferential line (31) is intersected by the two guide surfaces (29, 30) from opposite sides.
- A condenser component according to any one of claims 7 to 9, characterised in that the smallest spacing (D) of the two guide surfaces (29, 30) is greater than the width (E) of the fibre assembly (13) condensed with the condenser component (18).
- A condenser component according to any one of claims 7 to 10, characterised in that the height (H) of the two guide surfaces (29, 30) is greater than the width (E) of the fibre assembly (13) condensed with the condenser component (18).
- A condenser component for producing a mock twist from a plurality of fibre assemblies according to any one of claims 7 to 11, characterised in that at least two guide surfaces (29, 30) are provided for each fibre assembly (13) .
- A condenser component according to any one of claims 6 to 12, characterised in that at least the bearing surface (20) in the shape of a cylinder envelope consists of a composite material.
- A condenser component according to claim 13, characterised in that the composite material contains plastics and/or glass fibres.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007006282A DE102007006282A1 (en) | 2007-02-01 | 2007-02-01 | Drawframe with compression zone |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1953275A1 EP1953275A1 (en) | 2008-08-06 |
EP1953275B1 true EP1953275B1 (en) | 2009-08-19 |
Family
ID=39339829
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08000342A Active EP1953275B1 (en) | 2007-02-01 | 2008-01-10 | Drafting device with fibre condensing zone |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1953275B1 (en) |
JP (1) | JP5219189B2 (en) |
CN (1) | CN101235561B (en) |
AT (1) | ATE440160T1 (en) |
BR (1) | BRPI0800079B1 (en) |
DE (2) | DE102007006282A1 (en) |
ES (1) | ES2330058T3 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3124660A1 (en) | 2015-07-31 | 2017-02-01 | Maschinenfabrik Rieter Ag | Compressor unit for a stretcher of a textile machine |
DE102018126635A1 (en) | 2018-10-25 | 2020-04-30 | Maschinenfabrik Rieter Ag | Compressor unit, pressure roller unit and drafting system |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008057668A1 (en) * | 2008-04-24 | 2009-10-29 | Wilhelm Stahlecker Gmbh | Compressor unit for a drafting system of a textile machine |
JP5098880B2 (en) * | 2008-08-04 | 2012-12-12 | 株式会社豊田自動織機 | Fiber bundle concentrator in spinning machine |
DE102008064531A1 (en) | 2008-12-19 | 2010-07-01 | Wilhelm Stahlecker Gmbh | Compressor unit and traversing device for a drafting system |
DE102010054850A1 (en) * | 2009-12-28 | 2011-06-30 | Rotorcraft Ag | Compressor device for arrangement in compressing zone downstream to stretching unit, has wear-resistant attachment part and holding part, with which attachment part is axially and radially fixed in relation to roller |
CH714445A1 (en) * | 2017-12-15 | 2019-06-28 | Rieter Ag Maschf | Drafting system for a spinning machine with a compacting device. |
CH714444A1 (en) * | 2017-12-15 | 2019-06-28 | Rieter Ag Maschf | Drafting system for a spinning machine with a compacting device. |
DE102018126844A1 (en) * | 2018-02-06 | 2019-08-08 | Maschinenfabrik Rieter Ag | compressor unit |
EP3521488A1 (en) * | 2018-02-06 | 2019-08-07 | Maschinenfabrik Rieter AG | Condenser unit |
DE102018129210A1 (en) * | 2018-11-20 | 2020-05-20 | Maschinenfabrik Rieter Ag | Compressor unit for a drafting system of a textile machine |
DE102019113676A1 (en) * | 2019-05-22 | 2020-11-26 | Maschinenfabrik Rieter Ag | Compaction unit for a drafting system of a textile machine |
Family Cites Families (12)
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US4301574A (en) * | 1979-11-20 | 1981-11-24 | Zhestkov Vitaly I | Sliver condenser for open-end spinning machines |
JP4092001B2 (en) * | 1996-04-12 | 2008-05-28 | マシーネンファブリク リーター アクチェンゲゼルシャフト | Spinning machine, method for producing spun twisted yarn, and spun twisted yarn produced thereby |
DE19622941A1 (en) * | 1996-06-07 | 1997-12-11 | Cetex Chemnitzer Textilmaschin | Fibre compression unit |
DE19949666A1 (en) * | 1999-10-14 | 2001-04-19 | Stahlecker Fritz | Sliver compaction by air suction for drafting system includes a tapered suction slot with wider upstream section |
DE10039732A1 (en) * | 2000-08-15 | 2002-02-28 | Fritz Stahlecker | Condensing stage for drawn sliver, at a sliver drawing unit for a spinner, has a structured fiber guide edge at the suction slit to prevent the sliver twisting in different directions |
DE10051411A1 (en) * | 2000-09-01 | 2002-03-14 | Rieter Ag Maschf | Condensing stage, for drawn sliver at a spinner, has structured suction slits e.g. in a C-shape, to give a selected suction action on the sliver without kinking it |
DE10056668A1 (en) * | 2000-11-09 | 2002-05-16 | Fritz Stahlecker | Condensing stage for drawn sliver, at a sliver drawing unit, has a sliding surface for the transport belt formed by an insert into the suction slit of the suction channel, which can be replaced when worn |
DE10127741C2 (en) * | 2001-06-08 | 2003-05-08 | Zinser Textilmaschinen Gmbh | Drafting system for a spinning machine |
CN100360728C (en) * | 2002-05-08 | 2008-01-09 | 工业参股控股股份公司 | Drafting assembly for a ring spinning frame comprising a compressor for a fibre band |
DE10346258A1 (en) * | 2003-09-24 | 2005-04-21 | Stahlecker Gmbh Wilhelm | Drafting system for spinning with sliver compacting includes guide with V-shaped walls placed between two nip rollers in compaction zone |
CH697457B1 (en) | 2004-07-14 | 2008-10-31 | Holding Fuer Industriebeteiligungen Ag | Pressure roller unit. |
DE102005013765A1 (en) * | 2005-03-22 | 2006-09-28 | Maschinenfabrik Rieter Ag | Method and device for producing coregarn |
-
2007
- 2007-02-01 DE DE102007006282A patent/DE102007006282A1/en not_active Withdrawn
-
2008
- 2008-01-10 DE DE502008000076T patent/DE502008000076D1/en active Active
- 2008-01-10 AT AT08000342T patent/ATE440160T1/en active
- 2008-01-10 ES ES08000342T patent/ES2330058T3/en active Active
- 2008-01-10 EP EP08000342A patent/EP1953275B1/en active Active
- 2008-01-31 JP JP2008020751A patent/JP5219189B2/en not_active Expired - Fee Related
- 2008-01-31 BR BRPI0800079-4A patent/BRPI0800079B1/en not_active IP Right Cessation
- 2008-02-01 CN CN2008100053287A patent/CN101235561B/en active Active
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3124660A1 (en) | 2015-07-31 | 2017-02-01 | Maschinenfabrik Rieter Ag | Compressor unit for a stretcher of a textile machine |
DE102015112662A1 (en) | 2015-07-31 | 2017-02-02 | Maschinenfabrik Rieter Ag | Compressor unit for a drafting system of a textile machine |
DE102018126635A1 (en) | 2018-10-25 | 2020-04-30 | Maschinenfabrik Rieter Ag | Compressor unit, pressure roller unit and drafting system |
Also Published As
Publication number | Publication date |
---|---|
DE102007006282A1 (en) | 2008-08-07 |
JP2008190107A (en) | 2008-08-21 |
CN101235561A (en) | 2008-08-06 |
ES2330058T3 (en) | 2009-12-03 |
BRPI0800079B1 (en) | 2018-04-10 |
ATE440160T1 (en) | 2009-09-15 |
EP1953275A1 (en) | 2008-08-06 |
DE502008000076D1 (en) | 2009-10-01 |
CN101235561B (en) | 2011-06-08 |
JP5219189B2 (en) | 2013-06-26 |
BRPI0800079A (en) | 2008-09-16 |
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