Classifications

• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
  • D02J13/00—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass
• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
  • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
  • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
  • D02G1/0206—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting
  • D02G1/0266—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting false-twisting machines
• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
  • D02J13/00—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass
  • D02J13/003—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass by contact with at least one stationary surface, e.g. a plate

Definitions

• the present invention relates to an improvement brought to the texturing techniques by false twist, and relates more particularly to a new type of process able to be implemented on machines making it possible to treat partially or unstretched yarns, at high speed, in general. greater than 1000 m / min, the drawing of the wire being carried out during the texturing operation.
• the technique most used today is the so-called “simultaneous stretching-texturing” technique for which the stretching phase is carried out on the wire in the twisted state upstream of the false twist spindle, and this by simply adjusting the speeds between the two wire drawing systems provided upstream of the oven and downstream of the false twist spindle.
• this technique poses implementation problems, in particular in the case of polyester yarns, of which it is known that the zone where the necking point is located must be perfectly controlled.
• the invention therefore relates to a stretch-texturing process by false twist capable of being implemented on a machine consisting, in known manner, of a plurality of identical working positions mounted on a support frame , each position comprising, if we consider the direction of movement of the wire during its processing:
• a call system for delivering the yarn at a predetermined speed inside the texturing zone proper, zone formed by an oven, a cooling track and a false twist spindle; . a second call, the speed of which is greater than the first, by a value corresponding to the rate of drawing to be carried out on the wire; . means for winding the drawn and textured yarn, possibly preceded by a thermal re-fixing oven with a third call placed immediately before reception.
• the process according to the invention is characterized in that the necking point is located on the wire during the stretching phase, causing a sudden break or modification of the trajectory of the wire when it rises in temperature in the zone. texturing, and this by pressing on a surface or element allowing a rise in the torsion communicated by the spindle to the first call system.
• the trajectory is broken inside the furnace by adapting said furnace so that the trajectory change takes place when the temperature of the wire rises, preferably in the vicinity of the zone where it reaches inside the oven its optimal processing temperature.
• Such a process is particularly suitable for being applied to so-called "high temperature” ovens which are increasingly offered on false twist texturing machines to reduce the length of the heat treatment zone, such as those forming the subject of US-A-5,193,293 (corresponding to EP-A-524,111), the content of which is integrated as necessary into the present description.
• the type of oven which is the subject of the aforementioned patent comprising a heating block proper, which comprises a succession of cylindrical zones having different diameters, arranged in the extension of one another, the wire to be treated being kept at a constant distance from the outer surface of the zones of small diameter so that the temperature rise of the wire is obtained in these zones by radiation, while it comes into contact with the surface of the zones of large diameter, the heat transmission then being effected by contact, elements for guiding the wire being provided along the length of the
• This type of oven implementing the method according to the invention is characterized in that it comprises, if one follows the path of the wire, an entry zone where the heating is effected by radiation followed by a zoned
• the last zone advantageously consisting of a radiation heating zone.
• the intermediate zone between the entry zone and the exit zone is designed to allow, as said previously, a combination of radiation heating and contact heating, the length of the different zones being adapted depending on the wires to be treated.
• the zones of different diameters making it possible to have such a combination of radiation heating and contact heating are produced in a manner similar to the teachings of European patent EP-A-578 589 (patent corresponding to US-A-5 332 882), the design of which is such that the active element known as the "heating block” can be easily disassembled and reassembled, either for carrying out maintenance operations such as cleaning , or possibly to replace a heating block of structure determined by a different block when one wishes to modify the
• extremes of the enclosure surrounding the insulating enclosure and the heating block is removable and supports all of the connections making it possible to ensure the electrical supply of the oven, its regulation ..., that the heating block being fixed by the one of its ends of said removable face, in accordance with the improvement according to the invention, the areas of
• the oven is advantageously designed to treat two wires in parallel, guiding and positioning the wires
• the localization of the point of necking is obtained in the entry zone either during the rise in temperature of the wire, or when it reaches approximately the normal temperature of treatment by means of a module. of large diameter on which the wire or wires are in contact and at the outlet of which they embarrass, which makes it possible to cause a sudden rupture or modification of the trajectory of said wire, zone in which the necking point is located.
• the heating elements can also be adapted to each type of treatment by simple substitution or combination of elementary modules allowing a succession of contact heating and radiation heating, the lengths of which can be adapted according to the wires, the heating body proper being the same for any type of wire.
• FIG. 1 schematically illustrates a side view of a working position of a machine capable of implementing the method according to the invention
• FIG. 2 illustrates, in schematic perspective, the structure of an oven, which is also part of the invention, specially adapted to locate the point of necking of the wire during its drawing, and this in accordance with the invention, this figure showing the path of the wire during its passage inside the oven;
• FIG. 3 is an exploded perspective view showing in detail the heating element of an oven specially designed to implement the method according to the invention
• FIGS. 4 and 5 are views respectively in exploded perspective and in sectional elevation of an oven comprising a heating element produced in accordance with FIG. 3.
• each working position of the machine implementing the method according to the invention comprises, like any false twist texturing machine:
• a calling system (3) making it possible to deliver the yarn (2) at a predetermined speed inside the texturing zone proper, zone constituted by an oven (4), a cooling track (5) and a false twist pin (6);
• this machine comprises means which make it possible to modify the trajectory of the wire (2) during its rise in temperature in the texturing zone, preferably inside the same oven (4) in the vicinity of the zone where it reaches its optimal treatment temperature, while allowing a rise in torsion communicated by the spindle (6) until the first call (3).
• Such a rupture of the trajectory which makes it possible to locate the point of necking during the stretching phase, can possibly be achieved by providing means for preheating and deviating the path of the wire (2) before it enters the oven (4 ).
• Such means will however preferably be integrated into the oven (4) itself.
• the oven will advantageously be of the type comprising a heating block (B) proper which comprises a succession of cylindrical zones (see FIG. 2) having different diameters D and d arranged in the extension of each other.
• the wire (2) to be treated is kept at a constant distance from the small diameter sections d, the temperature rise being obtained in these areas by radiation, while it is in contact with the surface of large diameter zones D.
• the heating block (B) is designed, if one follows the path of the wire (2), so that it comprises an area (10) for entry of the radiation heating followed by a first contact heating zone (11).
• a guide (12) is arranged which makes it possible to locate the necking point on the wire by modifying the trajectory, without however blocking the rise in torsion communicated by the spindle (6), said trajectory then becoming regular, rectilinear or curvilinear as shown in FIG. 2 up to the exit from the oven with alternating heating zones by contact and by radiation.
• the last contact heating zone (13) is followed by a radiation heating zone (14).
• FIGS. 3, 4 and 5 illustrate in detail a furnace implementing the method according to the invention having the " general structure of the type of that which is the subject of US-A-5,332,882 (EP-A 578,589). ).
• the oven makes it possible to process two wires (2) in parallel.
• the insulating block (21), made of refractory material, is advantageously of cylindrical shape and comprises a recess, of cylindrical shape, intended to contain the heating element (B) which has a structure as illustrated in exploded manner in FIG. 3 .
• the heating element (B) is fixed by one of its ends to one of the end faces (16) of the cowling, this face being removable and supporting fittings (17) making it possible to ensure the electric supply of the oven and its regulation.
• the heating block (B) is designed so as to present a succession of zones having different diameters D and d, and this so that the wires (2) are in contact with the zones of large diameter D, the heat transmission then being carried out by conduction and are kept away from the zones of smaller diameter d, the heat transmission being then obtained by radiation.
• the sudden change in the path of the wire inside the oven is obtained by associating with the first module (11) of diameter D the first element guide (30) which is designed to embarrass the wire on the edge (lia) of the module (11) and which therefore serves to guide (12), thus making it possible to locate the point of necking in this zone.
• the length of the wire contact zone on this first module (11) can be variable depending on the nature of the wires and will generally be of the order of 2 to 10 cm.
• the heating element (B) is designed as shown diagrammatically in FIG. 3, and essentially consists of a cylindrical heating body (15), represented in dotted lines, comprising a or several resistors embedded in a matrix and obtained by molding.
• This heater also includes a thermocouple element allowing precise temperature regulation.
• the resistors can be designed in different ways, for example to have a constant temperature over the entire length of the oven or to have variable temperatures, in which case it is possible, for example, to have two resistors in parallel which can either be the same length or be offset from each other along the length of the oven.
• elementary modules are used, the length of which can be adapted as a function of the treatments to be carried out, which can be fitted by sliding on the heating body (10), and which constitute cylindrical surfaces of different diameter D and d.
• Each module can either alone form a zone of small diameter d, or a zone of large diameter D, or optionally combine an alternation of zones of large diameter D and zones of small diameter d as illustrated in FIG. 3.
• each module corresponds to the external diameter of the heating resistor (15) so that the modules can be fitted by simple sliding around the latter. Thanks to such a design, it is possible to adapt the structure of the oven according to the heat treatment to be carried out and the type of wire to be treated.
• the various modules and guides are kept in position around the heating body (10) by any appropriate means, for example by means of a locking ring or by means of screws, the various modules being blocked longitudinally by the intermediate a tie rod (17) integral with the inlet face (6), and the end (33) of which snaps into a notch (34) provided in the outlet guide (32). radiation
• the positioning of the first module (11) relative to the inlet of the oven is adjusted by means of a spacer (35) of appropriate length, making it possible to define an inlet area (10) where the heating is carried out by radiation which can have a length adapted according to needs.
• Such a type of oven makes it possible to carry out a texturing stretching operation of any type of synthetic yarn, including polyester yarn, the point of necking of the yarn being perfectly located during the stretching phase.
• This machine is equipped with a high temperature oven 100 cm in length, having a structure as shown diagrammatically in FIG. 2 and which comprises an inlet zone (10) allowing heating by radiation having a length of 20 cm followed by '' a zone (11) of diameter of diameter D of contact heating of 2 cm.
• the path of the wire (2) is deflected by the guide (30), which therefore causes an embarrassment with said surface (11) making it possible to locate the point of necking.
• Downstream of the deflection guide (30) are arranged a succession of zones of diameter D and of diameter d, having respectively a length of 1.2 cm and 5.5 cm, the trajectory of the wire being regular, straight or curvilinear until 'out of the oven.
• the last zone (13) of diameter D is followed by a zone (14) of diameter d having a length of 16 cm where heating by radiation takes place.
• the heating element embedded inside the block, element not shown in Figure 2 attached, is brought to a temperature of 600 ° C.
• the oven is followed by a cooling zone (5) with a length of 1.25 meters and a false friction spindle with external friction (6) rotating at a speed of 11,000 revolutions / minute, comprising ceramic discs .
• the speed of the output deliverer (7) is set to 1000 m / min, allowing a stretch of 1.73.
• a conventional fixing oven Downstream of the deliverer (7), a conventional fixing oven, not shown in FIG. 1, is arranged, having a length of 1.20 m and brought to a temperature of 200 ° C.
• the winding speed is 980 m / min.
• the machine according to the invention makes it possible, in industrial production, to eliminate the presence of broken strands and makes it possible to obtain a very homogeneous production between the different treatment positions from one machine to another.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Heat Treatment Of Articles (AREA)
• Springs (AREA)

Applications Claiming Priority (5)

Publications (2)

Family

ID=26231570

Family Applications (1)

Country Status (9)

Families Citing this family (4)

Family Cites Families (15)

• 1995
  • 1995-10-16 DE DE69510955T patent/DE69510955T2/de not_active Expired - Fee Related
  • 1995-10-16 JP JP8516608A patent/JPH10511143A/ja not_active Ceased
  • 1995-10-16 WO PCT/FR1995/001361 patent/WO1996016210A1/fr active IP Right Grant
  • 1995-10-16 EP EP95935502A patent/EP0802993B1/de not_active Expired - Lifetime
  • 1995-10-16 ES ES95935502T patent/ES2133815T3/es not_active Expired - Lifetime
  • 1995-10-16 AU AU37498/95A patent/AU3749895A/en not_active Abandoned
  • 1995-10-16 US US08/849,269 patent/US5918455A/en not_active Expired - Fee Related
  • 1995-10-16 CN CN95196378A patent/CN1061711C/zh not_active Expired - Fee Related
  • 1995-11-30 TW TW085209988U patent/TW351349U/zh unknown

Non-Patent Citations (1)

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