EP1544332A1 - Procédé pour paralléliser des fibres dans un système d'étirage et appareil pour son implémentation - Google Patents

Procédé pour paralléliser des fibres dans un système d'étirage et appareil pour son implémentation Download PDF

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Publication number
EP1544332A1
EP1544332A1 EP03380294A EP03380294A EP1544332A1 EP 1544332 A1 EP1544332 A1 EP 1544332A1 EP 03380294 A EP03380294 A EP 03380294A EP 03380294 A EP03380294 A EP 03380294A EP 1544332 A1 EP1544332 A1 EP 1544332A1
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EP
European Patent Office
Prior art keywords
sliver
rollers
parallelising
fibres
pressure
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.)
Withdrawn
Application number
EP03380294A
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German (de)
English (en)
Inventor
José Figuls Prat
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.)
Pinter SA
Original Assignee
Pinter SA
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 Pinter SA filed Critical Pinter SA
Priority to EP03380294A priority Critical patent/EP1544332A1/fr
Publication of EP1544332A1 publication Critical patent/EP1544332A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • D01H5/20—Drafting machines or arrangements without fallers or like pinned bars in which fibres are controlled by contact with stationary or reciprocating surfaces
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/04—Guides for slivers, rovings, or yarns; Smoothing dies
    • 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

Definitions

  • the present invention relates to a method for improving the parallelising of fibres in the drawing systems of spinning machines, and likewise relates to an apparatus for the implementation of said method.
  • one of the problems that must be solved in spinning is that of parallelising of the fibres, so that the yarn has the fibres correctly aligned, along the axis of the yarn itself, avoiding fibres that protrude and reduce the quality of the yarn.
  • drawing systems which have adopted the universal form of dividing the total drawing into a first zone or preliminary zone and another, main zone, the total drawing being the product of the drawing ratios of one and the other of said zones.
  • Preliminary drawing is carried out between the feed roller or third line roller, and the "bag” roller or second line roller, with very reduced values, customarily defined by drawing ratios between the respective linear velocities ranging between 1.05 and 2.5.
  • the main drawing is carried out between the rollers of the second line or “bag” rollers and the delivery rollers or first line rollers, with a very high drawing ratio, which may have a value of 50 or more.
  • the sliver is drawn from the feed roller to the second roller or "bag” line, along a line tangential to both rollers.
  • the present inventor has carried out extensive investigations in order to obtain improvements in the quality of the yarns after drawing, having arrived at the present invention.
  • the present invention is characterised by the simultaneous application to the sliver, between the third line of rollers and the second line of rollers of a conventional drawing system, of a transverse tension which causes the rectilinear path customarily followed to be varied by a new path, in the shape of an open V or similar, with the application of a simultaneous action of parallelising of the fibres which form the sliver.
  • the action of transverse pressing and deformation of the rectilinear path of the sliver will be carried out so that the path assumes a single open V-shape, that is to say, in the form of an obtuse angle, but it will be understood that a similar effect could be obtained by the application of deformation at various successive obtuse angles, right angles or acute angles, depending on the spinning characteristics.
  • the device for the implementation of the present method basically comprises one or more deflectors or bars arranged transversely with respect to the sliver between the third and second lines of rollers of the drawing system, said bar or bars having areas of contact with the sliver that are formed by a curved surface, having in the area of contact with the sliver a very smooth finish capable of producing a reduced effect of friction on the fibres of the sliver and, at the same time, parallelising the fibres, preferably obtained by means of the arrangement of fine grooving in the area of contact with the sliver, according to parallel grooves extending in the direction of movement of said sliver.
  • the device will have means for micrometric variation of the height of the bar or pressure members over the sliver.
  • the pressure members over the sliver will preferably consist of bars arranged transversely with respect to the sliver, preferably consisting of tubular members of substantially oval shape, provided with very controlled finish characteristics and/or grooves parallel to one another in the areas of contact with the sliver.
  • the area of contact of the bar with the sliver should be very polished and of a material which does not produce static electricity. As has been indicated, for some materials the parallelising results are improved if in the area of contact some very fine, small grooves are provided which apparently act like a comb, and which will preferably be rounded, for example, with a width of the order of 0.5 mm.
  • the device carrying the bars indicated will have means for varying the height of the bar with respect to the sliver which, after the V-shaped deformation produced on the sliver, will determine the effective height separation between the tangent to the rollers of the third and second lines and the vertex or point of major deformation at which the sliver will have arrived, after being subjected to the deforming action of the bar.
  • the distance between the tangent point between the sliver and the third line of rollers and the tangent point of the deflecting bar will likewise be important, both values indicated needing to be adjusted in order to obtain the optimum efficiency, according to the variable characteristics of the slivers to be processed.
  • a conventional type of drawing system comprises three successive lines of pairs of rollers which have been indicated in the figures by the numbers 1, 2, and 3, the first of these being the feed rollers or third line rollers, the second are those termed second line or “bag” rollers owing to the "bags" 4 and 5 associated with said second line of rollers, and a third line of rollers 3 which is that which achieves the final drawing.
  • the incoming sliver 6 is reduced between the lines of rollers 1 and 2, giving rise to a sliver of lesser width 7 which is reduced once more between the second and first lines, giving rise, together with the twisting action, to the yarn 8.
  • the drawing ratio between the rollers 1 and 2 varies customarily between 1.05 and 2.5, and the drawing ratio between the rollers 2 and 3 reaches very high values, of the order of 50.
  • the method of the present invention is based on causing the sliver 7, in an intermediate position between the third and second lines of rollers, to form a path substantially in the shape of one or more open Vs, that is to say, with an obtuse angle, by means of the application of a transverse pressure adapted to the characteristics of the sliver, said transverse deflecting action being optionally simultaneous with a parallelising action by means of grooving of the area of contact.
  • the apparatus intended to carry out the method of the invention will comprise a pressure area over the sliver 7 having a curved shape, for example the curved shape of an arc of a circle, preferably incorporated in a bar 10 of the type shown by way of example in the figures.
  • the area of contact with the sliver 7 will customarily be very polished and, optionally, may be provided with a plurality of grooves 11, parallel to one another, which occupy the area tangent to the sliver and areas immediate thereto, preferably having a curved shape, for example, as shown in Figure 11, in which will be observed the grooves 11 with a curved base separated by crests 12 of the same shape. Also, at this point, it should be pointed out that the existence or otherwise of said grooves and the precise shape thereof will be variable according to the spinning characteristics.
  • the apparatus of the present invention will have means for supporting the bar 10 or similar member carrying the curved area of contact with the sliver, and will preferably be associated with an arm 13 of variable characteristics, single or multiple, and provided with means 14 for its micrometric adjustment on a graduated scale 15 to permit precise determination of the position of the bar 10, determining the values h and x which determine the position of the tangent point of the deflector member or bar on the sliver 7 with respect to the tangent plane between the rollers of the third and second lines of the drawing system, and its height with respect to said line.
  • the specific structure of the support of the deflectors or bars will vary within wide limits to permit the production of concrete embodiments adaptable to the different types of spinning machine existing on the market so that these can be adapted so as to be able to work with the method of the present invention.
  • Figures 3 to 8 show a variant in which two arms 16 and 17 carry a bar 18 which passes through them, giving rise to two work areas 19 and 20, moving on guides of the type 21 and 22 fixed to the support 23 that can be fixedly coupled to the drawing system, making it possible to obtain easy height adjustment of the bars 10 with respect to a graduated scale 24 provided on the guides mentioned.
  • the work areas 19 and 20 may include respective grooves of the type which has been explained.
  • the angular arrangement of the bars with respect to the sliver may likewise be variable, a version having been shown in the figures in which the plane of symmetry of the bar forms an acute angle with the axis of displacement of the support ( Figure 1). However, said angle may also be variable within wide limits.
  • Table 1 shows the result of the tests with metric No. 100 combed cotton and with total drawing of 30.
  • the reduction of defects is very significant in all the divisions relating to the quality of the yarn which depend typically on the drawing and twisting process, especially CV (coefficient of variation), U (USTER standardisation), fine points, coarse points and ratio of appearance DR.
  • CV coefficient of variation
  • U USTER standardisation
  • fine points coarse points
  • ratio of appearance DR The slightly higher value for neps is interpreted as an effect due basically to defects of the sliver or very short fibres on which the drawing operation logically has a very reduced influence.
  • Table 2 shows the results of the laboratory tests for fluffiness, carried out on metric No. 100 combed cotton yarns with total drawing of 30.
  • N1 to N10 show, in order, the number of strands of 1, 2, 3..10 mm length per 400 metres of yarn, and at S3 the total quantity of strands having a length of 3 mm or more in the same length of 400 metres.
  • Total drawing 30.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP03380294A 2003-12-17 2003-12-17 Procédé pour paralléliser des fibres dans un système d'étirage et appareil pour son implémentation Withdrawn EP1544332A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03380294A EP1544332A1 (fr) 2003-12-17 2003-12-17 Procédé pour paralléliser des fibres dans un système d'étirage et appareil pour son implémentation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03380294A EP1544332A1 (fr) 2003-12-17 2003-12-17 Procédé pour paralléliser des fibres dans un système d'étirage et appareil pour son implémentation

Publications (1)

Publication Number Publication Date
EP1544332A1 true EP1544332A1 (fr) 2005-06-22

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EP03380294A Withdrawn EP1544332A1 (fr) 2003-12-17 2003-12-17 Procédé pour paralléliser des fibres dans un système d'étirage et appareil pour son implémentation

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EP (1) EP1544332A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1469107A2 (fr) * 2003-04-15 2004-10-20 Maschinenfabrik Rieter Ag Machine textile avec un dispositif d'étirage
CH711153A1 (de) * 2015-06-01 2016-12-15 Rieter Ag Maschf Käfig mit verstellbarer Druckstangenbefestigung für ein Druckwalzenpaar eines Streckwerks.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE472897C (de) * 1928-02-02 1929-03-07 Johannes Von Truembach Durchzugstreckwerk fuer Spinnmaschinen
GB883823A (en) * 1957-01-31 1961-12-06 Fairbairn Lawson Combe Barbour Drafting devices for textile spinning frames
US20020066165A1 (en) * 2000-11-28 2002-06-06 Chokri Cherif Sliver deflecting device positioned between two drafting roll pairs of a sliver drafting unit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE472897C (de) * 1928-02-02 1929-03-07 Johannes Von Truembach Durchzugstreckwerk fuer Spinnmaschinen
GB883823A (en) * 1957-01-31 1961-12-06 Fairbairn Lawson Combe Barbour Drafting devices for textile spinning frames
US20020066165A1 (en) * 2000-11-28 2002-06-06 Chokri Cherif Sliver deflecting device positioned between two drafting roll pairs of a sliver drafting unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1469107A2 (fr) * 2003-04-15 2004-10-20 Maschinenfabrik Rieter Ag Machine textile avec un dispositif d'étirage
EP1469107A3 (fr) * 2003-04-15 2005-08-31 Maschinenfabrik Rieter Ag Machine textile avec un dispositif d'étirage
CH711153A1 (de) * 2015-06-01 2016-12-15 Rieter Ag Maschf Käfig mit verstellbarer Druckstangenbefestigung für ein Druckwalzenpaar eines Streckwerks.

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