EP2964824A1 - Fabric in particular made of carbon yarns having low thickness variability combined with a specific basis weight range - Google Patents
Fabric in particular made of carbon yarns having low thickness variability combined with a specific basis weight rangeInfo
- Publication number
- EP2964824A1 EP2964824A1 EP14713538.8A EP14713538A EP2964824A1 EP 2964824 A1 EP2964824 A1 EP 2964824A1 EP 14713538 A EP14713538 A EP 14713538A EP 2964824 A1 EP2964824 A1 EP 2964824A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- equal
- less
- fabric
- fabric according
- stack
- 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.)
- Granted
Links
Classifications
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
- D06C3/00—Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics
- D06C3/06—Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics by rotary disc, roller, or like apparatus
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
- D06C15/00—Calendering, pressing, ironing, glossing or glazing textile fabrics
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D13/00—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft
- D03D13/008—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft characterised by weave density or surface weight
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
- D03D15/44—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads with specific cross-section or surface shape
- D03D15/46—Flat yarns, e.g. tapes or films
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
- D06C15/00—Calendering, pressing, ironing, glossing or glazing textile fabrics
- D06C15/02—Calendering, pressing, ironing, glossing or glazing textile fabrics between co-operating press or calender rolls
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2101/00—Inorganic fibres
- D10B2101/10—Inorganic fibres based on non-oxides other than metals
- D10B2101/12—Carbon; Pitch
Definitions
- the present invention relates to the technical field of machines for homogenizing the thickness of fibrous webs and / or spreading such fibrous webs in order to obtain lower surface weights.
- the invention relates to a method and a machine for homogenizing the thickness of such sheets, as well as fabrics obtainable by the implementation of such a method.
- edge allowance is accentuated very locally by the use of generally thermoplastic selvedge threads used on the edges of the fabric to block the last warp threads.
- the invention proposes to respond to the problems mentioned above and encountered in the prior art and to provide a new method and a new machine for controlling in a simple manner .
- the thickness of the textile web obtained after an operation spreading, so as to obtain a small variability of thickness, even on large widths of web.
- the invention describes a method of spreading a textile web comprising at least warp yarns, according to which:
- the web is brought to scroll between at least two rotary rollers whose axes extend parallel to one another and substantially perpendicular to the direction of travel of the web,
- the web is passed under pressure between, at least, a pressure generator of the rollers driven in axial oscillation and in opposition of phase,
- At least one pressure generator of the rollers is produced with adjustable pressure values along said generator to spread the sheet with a small thickness variability.
- rollers thus modulate the pressure applied between the center and the ends of the web, taking into account the different thicknesses of the web so as to apply a uniform pressure on the material along the pressure generator, typically, the applied pressure. in the center of the web is greater than that applied on its edges to account for the upper thickness of the web on its edges relative to its central part.
- one of the rollers which is flexible and the other rigid, is made and is exerted on this flexible roll, substantially perpendicular to its axis, localized supports distributed according to the axis of the roll and with adjustable values to achieve the generator with adjustable pressure values.
- the flexible roller can thus self-position without stress and thus modulate the pressure applied to the web.
- the method consists, among other things, in adjusting the position of the localized supports according to the axis of the flexible roller and / or in distributing the localized supports in a regular manner along the axis of the fiexibie roller, According to a preferred embodiment that can be combined with the previous one, the method consists, among other things, in distributing the localized supports, at most, over the entire width of the textile web.
- the method consists, among other things, in causing the textile web to pass over the periphery of the flexible roller between two pressure generators with adjustable localized pressure values of two driven rigid rollers. in synchronism, rotation and oscillation.
- the method consists in causing the textile sheet to pass between 1/6 and 1/3 of the periphery of the flexible roll. It is thus possible to overcome the tension applied to the moving textile web. Furthermore, this facilitates obtaining an adjustable pressure on the textile web, all along the two pressure generators, between the textile web and rigid rollers, since this mode of passage of the textile web which no longer wraps the rollers, as in US Pat. No. 4,932,107, thus makes it possible to add a series of rigid supports to the two rigid rollers thus avoiding any bending . On the other hand, this mode of passage also facilitates the positioning of the localized supports on the flexible roll.
- the method comprises heating the textile web as it passes between the pressure generator or generators,
- the method consists in providing, as textile web, a fabric comprising warp threads and weft threads each consisting of a set of filaments able to move freely relative to one another. to the others within said yarn, the spreading being carried out on the warp yarns and the weft yarns,
- the present invention also describes a machine for spreading a textile web composed of at least warp threads, comprising:
- the machine comprises a system for creating the pressure generator with adjustable pressure values distributed along said generator, for spreading the textile web with a small variability in thickness.
- the machine according to the invention comprises any or all of the features below when they do not exclude each other;
- the system for creating the pressure generator comprises among the rotary rollers ,, a flexible roller and a series of localized supports at adjustable pressure., distributed along the axis of the flexible roller and acting on the flexible roller supported by at least one rigid roll,
- the localized supports are equipped with a device for adjusting their position along the axis of the flexible roller.
- the localized supports exert their pressure on the flexible roller, via axially-running rolling members,
- the flexible roller delimits with two rigid rollers whose axes extend parallel to each other, two pressure generators with adjustable localized pressure values, these two generators being spaced between 1/6 and 1/3 of the periphery of the flexible roller ,
- the rollers have a diameter of between 30 mm and 60 mm
- the machine comprises for each rigid roller, a series of rigid supports each comprising a cradle fixed to a frame and having two supporting branches each equipped with a rolling member for a rigid roller, having a rotational movement and a movement of translation according to the tax of rigid rollers,
- the drive system of the rollers in axial oscillation and in opposition of phase comprises a motor driving in synchronism with the aid of a transmission, two camshafts offset by 180 °, one of which acts on one of the ends of the flexible roller and the other of which acts on one end of the rigid roll or rollers, the other end of the rollers being solicited by an elastic system; this makes it possible to ensure perfect control of the amplitude and the operation, in opposition of phase between the flexible roller and the two rigid rollers,
- the machine comprises a lifting system of the flexible roller whose ends are provided with plates on one of which acts the elastic system and on the other of which acts the camshaft,
- the machine comprises a heating system of the textile web during the passage of the textile web between the pressure generators.
- the subject of the invention is fabrics composed of warp yarns and weft yarns, having a small variation in thickness, characterized by one or other of the following combinations of characteristics:
- a mass per unit area greater than or equal to 40 g / m 2 and less than 100 g / m 2 and a standard deviation of thickness measured on a stack of three identical fabrics deposited on each other and in the same direction which is less than or equal to 35 pm,
- a mass per unit area greater than 160 g / m 2 and less than or equal to 200 g / m 2 and a difference: type of thickness measured on a stack of three identical tissues deposited one on the other and in the same direction which is less than or equal to 60 djm, or
- a weight per unit area greater than 200 g / m 2 and less than or equal to 400 g / m 2 and a standard deviation of thickness measured on a stack of three identical fabrics deposited on each other and in the same direction which is less than or equal to 90 pm.
- the warp and son son or weft consist of f a set of filaments, said filaments can move freely with respect to each other within a same thread Therefore, the fabrics according to the invention can be obtained by the process according to the invention.
- the method according to the invention allows access to such fabrics having such a combination of characteristics.
- the standard deviation of thickness is the root mean square of deviations from the mean, namely: with;
- n number of measurements of the thickness of a stack of three identical fabrics oriented in the same direction, that is to say that the son of chains on the one hand, and the son of frames of on the other hand, are oriented in the same direction at the time of stacking,
- ⁇ arithmetic mean of thickness measurements of the stack of the three identical tissues.
- the standard deviation can be obtained on a stack of three folds of the same fabric deposited on each other and oriented in the same direction and placed under pressure of 972mbar +/- 3mbar, and in particular, from 25 point thickness measurements spread over an area of 305 x 305mm ,. with, for example, one of the sides of the square extending parallel to the warp threads of the fabric.
- the method described in the examples can be used.
- the fabrics defined in the context of linventlon consist of warp son identical to each other and weft son identical to each other, and preferably, son of warp and weft all identical.
- the fabrics defined in the context of the invention consist, preferably at least 99% by weight, or even exclusively consist of reinforcing son muitJ-fll ents, including son of glass, carbon or aramid, the son of carbon being preferred.
- fabrics having a basis weight greater than or equal to 40 g / m 2 and: less than 100 g / m 2 , a standard deviation of thickness measured on a stack of three identical tissues, deposited on each other and according to the same direction which is less than or equal to 35 pm and an average opening factor of 0 to 1%.
- such fabrics exhibit an aperture factor variability of 0 to 1%.
- the spread obtained makes it possible to obtain such fabrics with yarns, and in particular carbon yarns, having a titre of 200 to 3500 Tex, and preferably 200 to 800 Tex,
- son and in particular carbon son having a titer of 200-3500 f Tex and preferably 400-1700 tex,
- fabrics which have a basis weight greater than 160 g / m 2 and less than or equal to 200 g / m 2 , a standard deviation of thickness measured on a stack of three identical fabrics deposited on each other and according to the same which direction is less than or equal to 60 ⁇ m and an average aperture factor of 0 to 0.5%.
- such tissues exhibit a variability of the factor of uvertyreversis of at most 0.5%.
- the spread obtained makes it possible to obtain such fabrics with yarns, and in particular carbon threads, having a titre of 200 to 3500 Tex, and preferably 400 to 1700 Tex,
- Such fabrics exhibit an aperture factor variability of at most 0.1%.
- the spread obtained makes it possible to obtain such fabrics with yarns, and in particular carbon yarns, having a titre of 200 to 3500 Tex and preferably of 800 to 1700 Tex.
- the aperture factor can be defined as the ratio of the area not occupied by the material to the total area observed, the observation of which can be made from above the fabric with illumination from below.
- Factor opening (OF) is expressed as a percentage, may, for example, be measured by the method described in the examples.
- Variability of aperture factor means the maximum difference in absolute value obtained between a measured aperture factor and the average aperture factor. The variability is therefore expressed in% as the opening factor.
- the average Aperture Factor can be obtained, for example, from 50 measurements of aperture factor spread over a surface of 305 x
- the distribution may, for example, be made by distributing 1/3 of the opening factor measurements over a first third of the fabric width, 1/3 of the opening factor measurements on the second third of the corresponding tissue width: at its central portion and 1/3 of the aperture factor measurements on the third third of the tissue width.
- Average Open Factor means the arithmetic mean of the 80 measured Open Factor (FO) values.
- Figure i is a schematic front view of a spreading machine according to Iinventlon.
- Figure 2 is a cross-sectional view of the spreading machine illustrated in Figure 1.
- Figure 3 is a schematic front view of a spreading machine according to the invention, in the raised position of the flexible roller.
- Figs. 4A and B are plan views of an example of a fabric illustrated before and after respectively
- Figure 5 is a view for schematically illustrating the spreading principle implemented by the spreading machine according to the invention.
- FIGS. 1 to 3 schematically illustrate an embodiment of a spreading machine according to the invention, adapted to spread with a small thickness variability, a textile ply 2 comprising at least threads of 3.
- a textile web means a sheet material consisting of son and son of warp, son extending along the axis of travel of the web on the machine.
- the textile webs may be unidirectional or fabrics.
- the web 2 is a fabric comprising warp yarns 3 and weft yarns 4, each warp 3 and weft yarn.
- the spreading machine i is placed at the output of a loom and input of a winding system of the web, it could also be expected that the sheet to be spread is from a unwinding system and is not directly positioned in line with a loom ,
- the spreading machine 1 comprises at least a first 5 and a second 6 rotary rollers and, in the illustrated example, a third rotary roll 7.
- the rotary rollers 5, 6 and 7 have axes A extending parallel between and perpendicular to the direction of travel fi of the web 2 or perpendicular to the warp son 3.
- the first roller S and the second roller 6 delimit between them a first pressure generator Gi for the web 2 passing between the first and second rollers 5, 6, Similarly, in the example illustrated in the drawings, the first roller S and the third roller 7 delimit between them a second pressure generator 2 for the web 2 passing between the first and third rolls S, 7, Well
- the length of the rollers is adapted to the width of the sheet 2 to be spread, so as to have a length greater than the width of the sheet 2.
- the length of the rolls is between e 1m and 2m.
- the rollers S, 6 and 7 are positioned in such a way that the two pressure generators G1 and G2 are spaced between 1/6 and 1/3 of the periphery of the first roll 5. other words, the web 2 is in contact with the first roll S only between 1/6 and 1/3 of its periphery.
- the second S and third rollers 7 are positioned side by side in a horizontal plane, while the first roll S is positioned in the middle and above the second 6 and third roll 7,
- the spreading machine according to the invention also comprises a drive to provide the drive synchronized in rotation about their axes and in the same direction of rotation, the second 6 and third rollers 7.
- the engine i ⁇ comprises an electric motor 11 controlled to drive in a synchronized manner, the rotational speed of the second i and third rollers 7, the output of the electric motor 11 cooperates with a transmission belt 12 which rotates pulleys 13 supported by shafts 14 mounted axially integral with the first end of the second S and third rollers 7
- the first roller 5 is not rotated by the actuator 10.
- the first S roller is rotated by the scroll strength of the web 2 and the rollers 6,7, course, i! it can be envisaged that the operator 1 ⁇ also drives in rotation the first roller S.
- the spreading machine also comprises a system for driving the rollers S, 6 and 7 in axial oscillation each along its axis A. More specifically, the drive system ÎS allows the axial oscillation of the axle. first roller S in phase opposition with respect to the second and third rollers 6 and 7 which are perfectly synchronized in axial oscillation.
- the drive system 15 comprises an electric motor li driving synchronously with the aid of a transmission 17 such as a belt, a first 19 and a second 2d camshafts allowing exert an axial force on the rollers.
- a transmission 17 such as a belt
- a first 19 and a second 2d camshafts allowing exert an axial force on the rollers.
- the cams of the cam shafts 19 and 20 are angularly offset from each other by a value equal to 180 °.
- the first camshaft 19 acts on the second end of the first roller S and more precisely on the transverse face of a shaft 2i extending axially from the first roller S.
- the first shaft cam 19 acts on the shaft 21, via a plate 11a carried by the shaft 21,
- the cam shaft 19 continues to exert an axial force on the shaft 21 as will be explained in more detail later in the description.
- the second camshaft 20 acts on the second end of the second roller 6 and in the illustrated example, the third roller 7 also.
- the second and third rolls S and 7 are axially equipped, at their second end, with shafts 22 in contact, by their transverse face, with the camshaft 20 which provides synchronized axial oscillation.
- second and third rolls S and 7 thus, the second and third rolls ⁇ and 7 have a perfectly synchronized axial oscillation.
- first, second and third rollers 5, 6 and 7 are biased by an elastic system 25 compensating for the action exerted by the cam shafts 19, 20 on the second ends of first, second and third S rollers 6 and 7.
- the elastic system 25 comprises stacks of Belleville washers interposed between on the one hand, a support 28 and on the other hand, each shaft 14 and a shaft 29 extending axially to from the first end of the first S roller,
- a stack of washers 25 Bellevllie 2B acts on the shaft via a plate 29a carried by the shaft 29.
- the drive system 15 as described above ensures a perfect control of the magnitude of operating in antiphase between the first S a hand roller and the second and third i rollers; On the other hand, by the way, this solution makes it possible to guarantee the desired movement of the rollers, in spite of the phenomena of wear due to the elimination of the mechanical clearance between the cam shafts and the rollers.
- the axial vibration frequency is adjustable, for example, from 5 to 50 Hz through the adjustment of the electric motor 16.
- the amplitude of the axial oscillation of the rollers is about 0.5 mm.
- the spreading i machine also comprises for the second and third rollers and ⁇ 7 f a series of rigid supports 31 for supporting bending without the rollers whilst permitting their movement rotation and oscillation, in the illustrated example , each rigid support 31 comprises a fork or cradle 32 is rigidly fixed to frame 33 preferably rigidly anchored to the ground. Each fork or cradle 32 thus has two support legs 34 each equipped with a rolling member 35 for a roller S, 7 f that can receive both rotational movement and the oscillation movement, in the illustrated example. in FIG. 1, four rigid supports 31 support the rollers.
- the number of rigid supports 3i may be different depending in particular on the length of the rollers,
- the spreading Machine i comprises a system 40 for creating the first IF pressure generator and in the example illustrated, also the second pressure generating 2 t with adjustable pressure values distributed according to or generatrices., to spread the sheet 2 with a small variability of thickness.
- the system 40 makes it possible to modulate the pressure at will, along these pressure generators G1, 2 to apply a uniform pressure on the sheet taking into account the initial differences in the thickness of the sheet, view of the tablecloth with a small variability of thickness.
- the system 40 comprises, as first roll S, a flexible roll and a series of adjustable pressure supports 42, distributed along the axis of the flexible roll 5 and acting on the flexible roll S,
- the first roller 5 is flexibly mounted along its axis in the sense that it is free of any guide bearing at both ends, the flexible roller S can thus self-position, without any constraint, between the other two rollers S and 7,
- the second and third rollers 6 and 7 are rigid because they are supported without bending by the frame 33.
- Each localized support 42 exerts its pressure on the flexible roll 5, via rolling members 43 with axial displacement.
- each localized support 42 is able to exert a substantially vertical pressure force perpendicular to the axis of the flexible roll S while accepting the rotation and axial oscillation movement of the roll.
- each localized support 42 is a pressure cylinder 44 whose rod is equipped with a rolling member 43.
- Each pressure cylinder 44 is connected to a control unit not shown but known per se to adjust the pressure exerted on the flexible roll 5,
- the spreading machine t comprises four pressure cylinders"
- the number of pressure cylinders 44 may be different.
- the localized supports 42 are equipped with a device 46 for adjusting their position along the axis of the flexible roller 5,
- the localized supports 42 can be moved independently of each other, along the axis of the flexible roller S so as to be able to exert their pressure force in the selected places of the web 2,
- the cylinders 44 are slidably mounted along a gantry 45 overhanging at a distance the flexible roller 5.
- Each jack 44 is placed in a fixed position by means of a locking system of the cylinder body on the frame, not shown, but of all types known per se.
- the I spreading machine of the invention comprises a lifting system 48 of the flexible roll S to allow the introduction operations the web 2 between the flexible S roller and the rigid roller 6 f 7,
- the lifting system 48 comprises two jacks 49 fixed by their body on the gantry 45 and whose rods 4a act on the shafts 21 and 29 extending from the two ends of the flexible roller S, it should be noted that the elastic system 25 acts on the shaft 2® of the flexible roll S while the camshaft 19 continues to exert an axial force on the shaft 21, even during the lifting operations of the flexible roll 5 due to the presence of the end plates 21a and 29a, as illustrated in FIG .
- the spreading machine comprises a heating system Si of the sheet and rollers during the passage of the sheet between the generatrices of pressure.
- the heating system Si comprises a nozzle 52 for supplying hot air produced by a hot air production unit that is not shown but known in the ground.
- This supply hug S 1 opens between your two rigid rollers 7 and 7 while directing the flow of hot air to the flexible roll S according to its part located between the two pressure generators S1 and O2.
- a Leister type heating unit is used to ensure the heating of the sheet 2 and the rollers up to at a temperature of 80 ° C.
- the spreading machine 1 comprises a flexible roll S and two rigid rollers ⁇ f 7 addressesssan two pressure generating Csi, G2.
- the spreading machine according to the invention may have a similar operation by implementing a single rigid roll 6 defining with the flexible roller S, a single pressure generator € 1.
- the spreading machine described above comprises, as localized supports 42, cylinders exerting a pressure force on the flexible roll S.
- Other solutions can be envisaged with a view to creating generators. pressure with adjustable pressure values.
- the spreading machine i according to the invention is particularly suitable for spreading the warp threads 3 and also the weft threads 4 when the web 2 is a fabric.
- the mppe 2 is brought to scroll between at least two rotary rollers 5, 6-7 whose axes A extend parallel to each other and substantially perpendicular to the direction of travel of the web,
- the web is passed under pressure between at least one pressure generator 61 of the rollers driven in axial oscillation and in opposition of phase, and at least one pressure generator G1 of the rollers 5, 6-7 is made with adjustable pressure values along said generatrix for spreading the sheet 2 with a small thickness variability.
- the sheet 2 is kept under a substantially constant low value voltage, by means of appropriate systems of tension of the sheet 2, located on its path, upstream and downstream, rolls of pressure and designed to compensate for the forces likely to appear, for example, upstream at the output of the loom and, downstream, at the winder of the ppe,
- one of the flexible rollers 5 and the other rigid S ⁇ 7 is produced and, on this flexible roll, is carried substantially perpendicularly to its axis, localized supports 42 distributed along the axis of the roll and with adjustable values to make the generator with adjustable pressure values.
- pressures of different values are exerted in different places of the pressure generator to ensure correct spreading of the son of the sheet 2,
- the method consists in adjusting the position of the localized supports 42 along the axis of the flexible roller so as to selectively choose the places where the pressures are to be applied. For example, it is possible to distribute the localized supports 42 regularly along the axis of the flexible roller. However, the adjustment consists of distributing the localized supports 42 at most over the entire width of the ply 2. Indeed, whatever the width of the ply, the localized supports 42 always act within the interior of the ply. delimited area overhanging the width of the web 2.
- the localized supports 42 must not act on an area of the flexible roll that is never in contact with the web 2,
- the position of the cylinders which are adjacent to the edges of the web are positioned to be at least 50mm apart from these edges.
- the cylinders that are adjacent to the edges of the sheet are positioned to be spaced 150mm from these edges.
- the cylinders between these two cylinders adjacent to the edges are positioned so that all cylinders are spaced regularly.
- the number of jacks is chosen so that the distance between two adjacent jacks is at least 300 mm.
- the web 2 is caused to pass on the periphery of the flexible roll S between two pressure generators 6i, 62 with adjustable localized pressure values. These two generators are delimited between the flexible roller S and two rigid rollers 6, 7 driven, in synchronism, rotation and oscillation.
- the web 2 is caused to pass on the flexible roller 5, between i / 6 and 1. / 3 of the periphery of the flexible roll 5.
- the web 2 and the rollers are heated during its passage between the pressure generator or generators.
- the spread textile webs will be, at least, partly made of reinforcement threads of the carbon, glass or aramid type which are conventionally constituted of a set of filaments extending in the direction of the thread.
- the textile web to be spread out will consist either exclusively of a unidirectional sheet of warp yarn or of a fabric consisting of an intertwining of warp yarns and yarns. frame.
- the son are not secured to each other by any binder or sewing or knitting type mechanical binding mode that would hinder their movement relative to each other and would not allow their spreading.
- the warp yarns and the weft yarns are held together by the weaving only.
- the textile ply consisting of a unidirectional sheet of warp yarns the latter will made of carbon, glass or aramid threads.
- the son intended to be spread in the process according to the invention consist of a set of filaments freely movable relative to each other, and in particular carbon son.
- Such son may initially have a circular section or, preferably, rectangular, but at the output of the method according to the invention, they will have a rectangular section following the application of pressure forces.
- the son to be spread and thus the constituent yarns of the fabrics according to the invention, will not be impregnated, nor coated, nor associated with any polymeric binder that would hinder the free movement of the filaments, some by compared to others.
- the wires to be spread are, nevertheless; most often characterized by a mass content of standard size that can represent at most 2% of their mass.
- a carbon fiber is comprised of a set of filaments and generally has from 1,000 to 80,000 filaments, preferably from 12,000 to 24,000 filaments. Particularly preferably, in the context of the invention, carbon threads of from 1 to 24 K, for example 3K, 6K, 12 or 24K, and preferably 12 and 24K, are used.
- the carbon threads present within the unidirectional sheets have a titer of 60 to 3800 Tex, and preferably 400 to 900 tex.
- the unidirectional sheet can be made with any type of carbon thread, for example High son Resistance (H) which ie tensile modulus is between 220 and 241GP3 and whose tension stress rupture is between 3450 and 4830MPa f son of Moduie Intermediate (M) having a tensile modulus is between 290 and 297GPa and whose tensile breaking stress is between 3450 and 6200 Pa and High Module Wires (HM) whose tensile modulus is between 345 and 448GP3 and whose tensile breaking strength is between 3450 and 5520Pa
- H High son Resistance
- M Moduie Intermediate
- M Moduie Intermediate
- HM High Module Wires
- Fig . 4a schematically shows a pre-spreading fabric consisting of an intertwining of warp yarns and weft yarns of width slightly different from the weaving process. It can be in particular carbon threads of 3. Each of the warp and weft threads consist of a set of filament. Initially, the opening factor of the textile web is 4% ⁇
- Piece 48 illustrates the fabric obtained after the implementation of the spreading method according to the invention, this fabric has an OF content of 0% and warp and weft son of different width,
- the textile web before being subjected to the process according to the invention it is possible for the textile web before being subjected to the process according to the invention to have a zero or non-zero opening factor.
- the application of the process according to the invention results in a decrease of the opening factor which accompanies the obtaining of the homogenization of the thickness of the textile web.
- the opening factor is zero or not damaged, the application of the method according to the invention causes a decrease in the thickness of the pa pa homogenization of the thickness of the son constituting it "The invention is not limited to the examples described and represented because various modifications can be made without departing from its scope »
- the program takes 25 measurement points thanks to its triggering fear.
- the measurement of 25 "empty" points is repeated, that is to say without the stacking of the three tissues in order to measure the thickness of the vacuum cover and the window.
- the opening factors were measured according to the following method.
- the device consists of a SONY brand camera (model SSC ⁇
- DC58AP equipped with a lOx lens, and a Waidmann brand light table, model W LP3 NR f iQ138I 230V 50 ⁇ 2xi5W.
- the sample to be measured is placed on the light table, the camera is fixed on a bracket, and positioned at 29cm from the sample, then the sharpness is adjusted.
- the measurement width is determined according to the textile web to be analyzed. using its ring (zoom), and a ruler: 10 cm for open textile sheets (OF> 2%), 1.17 cm for its slightly open textile sheets (OF ⁇ 2%).
- the brightness is adjusted to obtain a GF value corresponding to that given on the control shot.
- the Videometrics Contrast Logiclei from Scion Image Corporation (Scion Corporation, USA), is used. After image capture, the image is processed in the following way: using a tool, one defines a maximum area corresponding to the selected calibration, for example, for 10 cm ⁇ 70 holes, and having an integer number of patterns, then selecting an elementary surface in the textile sense of the term, that is to say a surface that describes the geometry of the fabric by repetition,
- the percentage OF is defined by a hundred times the ratio of the white surface divided by the total area of the elementary pattern: 100 * (white surface / elementary surface). It should be noted that the adjustment of the luminosity is important because diffusion phenomena can modify the apparent size of the holes and therefore of ⁇ . An intermediate luminosity will be retained, so that no phenomenon of saturation or diffusion too important does not be visible.
- the machine used is in accordance with Fig * i and 2, with the rollers 61) mm diameter and a length of i? 0ûmm, the cylinders being spaced apart 320mm, both situated at the ends being spaced 155 mm from the edge of tissue.
- Tai tea i I gives as examples, for the fabrics presented in Tabieay 2, the support force of the 4 jacks 44 of pressure (n ° 1 to 4) taken from one edge to the other of the fabric , with a speed of travel of the textile web (mm / min), a frequency (Hz) and a temperature (° C), According to these embodiments, greater forces are applied in the central zone of the fabric 2 allowing a good spreading of the fabric 3 ⁇ 4 by compensating for the difference in thickness initially existing between the center and the edges of the fabric, as illustrated in FIG.
- the AS4 3K yarns supplied by Hexcel Corporation are high tensile strength yarns of 4433 ⁇ m, tensile modulus of 231GPa have a 20QTex yarn with 7.1 micron filaments.
- the AS4 12K yarns supplied by Hexcel Corporation are high tensile stress tensile yarns of 4433 MPa, tensile modulus of 231 GPa have a security grade of OSGIex with filaments of 7.1 microns.
- the IM7 wires supplied by the Hexcel Corporation are intermediate stress strainer modulus yarns of 276Gpa and have the title of 223Tex with 5.2 micron filaments.
- the 12K wires supplied by Hexcel Corporation are 5670Mpa Intermediate Tensile Stress Modulus, 276Gpa tensile modulus, and have a 446Tex titer with 5.2 micron filaments. ,
- the fabric i ⁇ 9g / 'm 2 3K AS4 before spreading has a middle opening factor of 10.5% (12.5% on the edges of the fabric, 6.5% of the center of the fabric) is a variation of 6% of the opening factor between center and edge, and an average thickness of 0 91mm (0.201mm on the edges of the fabric, 0.187mm on the center of the fabric) is a variation of thickness of 12% between center and edge.
- the standard deviation of the thickness of the stack of three folds of the non-spread fabric is 0.055mm.
- the opening factor of this same tissue increases to an average of 0.1%, ie a reduction of 99% compared with the non-spread tissue, with a maximum variation of 0.5% which is not elsewhere, not due to an increase in values at the edges, the average opening factor of the edges and the center being equal to 0.1%, a large part of the measured opening factors are close to 0%, and a small population above 0.1% up to 0.5% in rare cases, inducing a 0.1% average with a maximum variation of 0.5%.
- the thickness of the tissue after plating was 0.77 mm, which was reduced by 8% compared to the non-spread fabric.
- the standard deviation of the stack of three folds of the spread fabric is 0.030mm, a gain of 45% over the non-spread fabric. This information is collected in Ta leay 3 below,
- a fabric of 75 g / m 2 AS4C 3K will have a
- the implementation of the method according to the invention causes a significant decrease in the standard deviation of the thickness, the average thickness, the opening factor and its variability.
- the gain in standard deviation of thickness of 3 folds under a pressure of 972m8ar is equal to at least 20%, and in most cases, is greater than 30%.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1352122A FR3002928B1 (en) | 2013-03-08 | 2013-03-08 | METHOD AND MACHINE FOR SPREADING A TEXTILE CLOTH OF FABRIC TYPE AND FABRICS OBTAINED |
PCT/FR2014/050508 WO2014135805A1 (en) | 2013-03-08 | 2014-03-06 | Fabric in particular made of carbon yarns having low thickness variability combined with a specific basis weight range |
Publications (2)
Publication Number | Publication Date |
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EP2964824A1 true EP2964824A1 (en) | 2016-01-13 |
EP2964824B1 EP2964824B1 (en) | 2019-02-27 |
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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EP14713540.4A Active EP2964825B1 (en) | 2013-03-08 | 2014-03-06 | Method and machine for spreading a fabric-type textile sheet |
EP14713538.8A Active EP2964824B1 (en) | 2013-03-08 | 2014-03-06 | Fabric in particular made of carbon yarns having low thickness variability combined with a specific basis weight range |
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EP14713540.4A Active EP2964825B1 (en) | 2013-03-08 | 2014-03-06 | Method and machine for spreading a fabric-type textile sheet |
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US (2) | US9637850B2 (en) |
EP (2) | EP2964825B1 (en) |
JP (2) | JP6416795B2 (en) |
CN (2) | CN105008608B (en) |
AU (2) | AU2014224484B2 (en) |
BR (2) | BR112015021176B1 (en) |
CA (2) | CA2900732C (en) |
ES (2) | ES2630372T3 (en) |
FR (2) | FR3002928B1 (en) |
WO (2) | WO2014135805A1 (en) |
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CN107213942A (en) * | 2017-08-03 | 2017-09-29 | 无锡市第五人民医院 | Laboratory tablecloth spreading device |
CN108252010A (en) * | 2018-03-07 | 2018-07-06 | 常州市新创智能科技有限公司 | The woven carbon fiber unidirectional cloth fine shaping equipment of heating exhibition |
CN109132649A (en) * | 2018-09-29 | 2019-01-04 | 侯马市迪科特电子科技有限公司 | A kind of quick flattening device of wall paper |
JP7211198B2 (en) * | 2019-03-26 | 2023-01-24 | 三菱ケミカル株式会社 | Manufacturing method of carbon fiber fabric |
CN110607675B (en) * | 2019-09-28 | 2020-04-10 | 浙江诸暨浩越袜业有限公司 | Flat pressing device for sock production |
CN113707400B (en) * | 2020-05-21 | 2023-04-25 | 青岛云路先进材料技术股份有限公司 | Amorphous alloy strip with ultrathin coating and preparation method and equipment thereof |
CN112030441B (en) * | 2020-08-31 | 2021-12-03 | 大畏机床(江苏)有限公司 | Cloth evener capable of being adjusted according to thickness |
CN115652572A (en) * | 2022-10-19 | 2023-01-31 | 嘉兴杰特新材料股份有限公司 | Glass fiber plain cloth pre-stretching device and method |
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2014
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