EP0341487B1 - Nähgarn sowie Verfahren zur Herstellung desselben - Google Patents

Nähgarn sowie Verfahren zur Herstellung desselben Download PDF

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Publication number
EP0341487B1
EP0341487B1 EP89107520A EP89107520A EP0341487B1 EP 0341487 B1 EP0341487 B1 EP 0341487B1 EP 89107520 A EP89107520 A EP 89107520A EP 89107520 A EP89107520 A EP 89107520A EP 0341487 B1 EP0341487 B1 EP 0341487B1
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EP
European Patent Office
Prior art keywords
yarn
sewing
sewing yarn
sewing thread
laser beams
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.)
Expired - Lifetime
Application number
EP89107520A
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German (de)
English (en)
French (fr)
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EP0341487A1 (de
Inventor
Eckhard Prof. Dr. Schollmeyer
Thomas Dr. Bahners
Kurt Dipl.-Ing. Truckenmüller
Karl Dipl.-Ing. Greifeneder
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.)
Amann and Soehne GmbH and Co KG
Original Assignee
Amann and Soehne GmbH and Co KG
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Publication date
Application filed by Amann and Soehne GmbH and Co KG filed Critical Amann and Soehne GmbH and Co KG
Priority to AT89107520T priority Critical patent/ATE71161T1/de
Publication of EP0341487A1 publication Critical patent/EP0341487A1/de
Application granted granted Critical
Publication of EP0341487B1 publication Critical patent/EP0341487B1/de
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    • 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
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/40—Yarns in which fibres are united by adhesives; Impregnated yarns or threads
    • D02G3/402—Yarns in which fibres are united by adhesives; Impregnated yarns or threads the adhesive being one component of the yarn, i.e. thermoplastic yarn
    • 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
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
    • D02G3/46—Sewing-cottons or the like
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
    • D06M10/005—Laser beam treatment

Definitions

  • the present invention relates to a sewing thread according to the preamble of claim 1 and two methods for producing such a sewing thread.
  • a sewing thread with the features of the preamble of claim 1 is described in GB-PS 1270174.
  • the known sewing thread optionally has a multiplicity of individual filaments or individual fibers, ie it is designed as a multifilament thread or fiber thread.
  • the individual filaments or individual fibers of the yarn are connected to one another via connection areas, these connection areas being produced by embedding meltable particles in the sewing thread.
  • the individual filaments or individual fibers are charged with the meltable particles before the sewing thread is produced, or the sewing thread is electrostatically charged before the particles are applied, so that the individual fibers or individual filaments spread apart and thus the arrangement of the meltable particles can be made within the yarn.
  • the sewing thread is electrostatically charged before the particles are applied, so that the individual fibers or individual filaments spread apart and thus the arrangement of the meltable particles can be made within the yarn.
  • this Finished yarn loaded with particles is heated to the melting temperature of the particles, so that such sewing thread is predominantly glued from the inside of the fiber.
  • connection areas consisting of the fusible particles become plastic again or even melt, which leads to undesirable soiling of the sewing needles, a lack of thread closure of the sewing material and undesirable postponements Individual filaments or individual fibers and thus can lead to frequent sewing thread breaks.
  • the present invention has for its object to provide a sewing thread of the specified type which, with special consideration of the processing properties when sewing, has a high thermal resistance to the temperatures occurring during sewing.
  • the sewing thread designed according to the invention has a multiplicity of individual filaments and / or individual fibers, ie it can thus be designed both as a fiber thread or as a multifilament thread and as a core thread in which the core consists of a multifilament thread and the sheath consists of a fiber thread or vice versa.
  • the individual filaments or individual fibers of the sewing thread are connected to one another via connecting areas which are arranged predominantly or exclusively on the surface of the sewing thread are.
  • these connection areas only or almost exclusively glue together the individual filaments or individual fibers arranged on the outside of the sewing thread, although it cannot be ruled out over the length of the thread that exceptionally few individual, more inner individual filaments or individual fibers are glued to one another.
  • the connection areas comprise a solidified melt of the polymeric material of the respective yarn. Between the connection areas, the sewing thread according to the invention has sections in which the yarn has a more voluminous structure than the connection areas.
  • the sewing thread according to the invention has a number of advantages. Surprisingly, it was found that the running properties of such a sewing thread were significantly improved in comparison to a corresponding sewing thread which has no connection areas, although it was expected that the arrangement of the connection areas exclusively or predominantly on the outside of the sewing thread would result in the risk of undesired suspensions being formed would be increased when sewing. This is attributed to the fact that despite the above-described increase in roughness in the sewing thread according to the invention, the thread composite, ie the cohesion of the individual fibers or individual capillaries, is improved, so that when compared to a corresponding sewing thread that these connection areas do not have, when sewing with the sewing thread according to the invention there are significantly fewer breaks in the sewing thread.
  • connection areas are voluminous sections are provided between the connection areas, in which air is embedded, which causes additional cooling of the sewing needle and thread guide elements.
  • connection areas melt in the sewing thread according to the invention, since the melting point of the material in the connection area essentially corresponds to the material of the sewing thread.
  • the sewing thread designed according to the invention takes up a larger amount of finishing agents than a corresponding conventional sewing thread because of the higher roughness described above, which is particularly noticeable in the case of block activation.
  • connection areas which are predominantly spherical or spherical.
  • these connection areas have a diameter which corresponds to approximately 0.5 to approximately 2 times the value, in particular 0.5 to 1 times the value of the diameter, of a single filament or a single fiber.
  • Such connecting areas located in the outer region of the yarn effectively prevent the sewing thread from spreading open during the sewing process or from spreading out of individual filaments or individual fibers of the sewing thread, so that slides, filament breaks or fibrillation of the filaments and yarn breaks are avoided.
  • such ball-like or ball-like connecting areas reduce the frictional resistance of the outer yarn layer to the sewing needle or the thread deflecting members due to their relatively small surface area, which is reflected in a correspondingly improved running and sewing behavior and less heating of the sewing needle or the thread deflecting members.
  • the connecting areas are stochastically distributed over the length and the circumference of the yarn. Such a distribution leads to a particularly durable yarn composite without there being a loss of strength. Rather, the above-described connection of the outer individual filaments or individual fibers achieves a reinforcement comparable to a three-dimensional crosslinking thereof, which results in an increase in the yarn strength and a local fixation of the outer elementary fibers or filaments relative to the inner filaments or Expresses fibers.
  • connection areas Depending on the respective area of use of the sewing thread according to the invention, this has a different number of connection areas.
  • the axial distance and the distance in the circumferential direction between the connection areas is very small, and thus a large number of connection areas are provided.
  • the axial distance between two connection areas is between approximately 0.1 mm and approximately 4 mm and the distance in the circumferential direction is between approximately 0.1 mm and approximately 0.4 mm.
  • the distance between two connection areas can be increased in the axial direction to values between approximately 4 mm and approximately 10 mm and in the circumferential direction to values between 0.4 mm and 0.6 mm, while normally stressed sewing threads in the axial direction a distance between adjacent connection areas have between about 10 mm and about 20 mm and in the circumferential direction a distance between about 0.6 mm and 0.8 mm.
  • connection areas are stochastic over the length and the circumference of the thread, i.e. are distributed according to no predetermined pattern or regularity.
  • zones are present, seen in the axial direction, in which the connection areas are piled up. This means that in these zones, which have an accumulation of connection areas, there is a particularly high yarn closure of the outer fibers, yarns or filaments, so that such a yarn has particularly good sewing properties.
  • connection areas are provided in the yarn area between two adjacent zones, so that such a sewing thread between two adjacent zones has very voluminous areas.
  • the yarn volume in these areas is between approximately 5% and approximately 40%, preferably between approximately 10% and approximately 20%, greater than the yarn volume in the zones where there is an accumulation of connection areas.
  • these preferably have an axial length between approximately 0.1 mm and approximately 0.4 mm, in particular between approximately 0.1 mm and 0.2 mm, while neighboring zones generally have one have an axial distance between about 10 mm and about 20 mm, preferably between about 13 mm and about 18 mm.
  • connection areas in a zone which is provided with an accumulation of connection areas is between 5 ⁇ m and 50 ⁇ m, preferably between approximately 20 ⁇ m and approximately 30 ⁇ m, while Seen over the circumference of the yarn, the distance from adjacent connection areas in this zone is between 5 ⁇ m and 40 ⁇ m, in particular between approximately 10 ⁇ m and approximately 20 ⁇ m.
  • the sewing thread designed according to the invention, it consists of at least two intermingled multifilament threads.
  • the first multifilament yarn which preferably has a higher strength than the second multifilament yarn, forms the soul of the sewing thread, while the second multifilament yarn is looped, looped and / or arched or knotted in a tangled manner with the first filament yarn and envelops or envelops it like a coat covers.
  • the second multifilament yarn is preferably arranged in the outer area of the sewing thread and accordingly also predominantly or exclusively has the connection areas.
  • this sewing thread has a higher strength as well as lower boiling and thermal shrinkage values in comparison with a conventionally designed intermingled sewing thread and also causes excellent cooling of the needle and thread deflection elements when sewing. This is attributed to the incorporation of air in the relatively voluminous sections between the connection areas, which is captured by the waist-like constriction in the connection areas and is pressed out during deflection or sewing.
  • the first multifilament thread is covered by a multifilament thread intermingled therewith or by several, preferably two multifilament threads intermingled therewith in such a way that the soul is completely covered by the outer multifilament thread or the outer multifilament threads.
  • the connection areas are provided only in the outer area of the outer multifilament yarn or the outer multifilament yarns, so that a part of the tensile load is absorbed by the outer multifilament yarn or the outer multifilament yarns in the event of a tensile load due to the crosslinking via the connection areas.
  • a particularly preferred embodiment of the sewing thread according to the invention additionally has a twist, which is between approximately one twist / m and approximately 400 twists / m, in particular between approximately 100 twists / m and approximately 400 twists / m.
  • a twist which is between approximately one twist / m and approximately 400 twists / m, in particular between approximately 100 twists / m and approximately 400 twists / m.
  • connection areas can also be provided in the case of a sewing thread which has a core-sheath structure, the core usually made of a multifilament thread and the sheath made of a fiber thread and / or one or more fiber threads or one fiber thread or several fiber threads and one or more multifilament yarns.
  • thermoplastic fiber yarn and / or multifilament yarn is arranged in the outer region of the sewing thread according to the invention.
  • This can be, for example, a polyester, polyamide, aramid and / or polyolefin fiber yarn or multifilament yarn.
  • Another object of the present invention is to provide a method for producing the sewing thread provided with connection areas.
  • the inventive method claimed in claim 17 is based on the basic idea of treating a yarn suitable for sewing purposes with pulsed laser beams in such a way that part of the outer individual filaments and / or the outer individual fibers of the same with formation of essentially spherical, solidified filament or Fiber material existing connection areas is fused together.
  • the impact on the yarn pulsed laser beams that a part of the yarn material and / or the fiber accompanying substances adhering to it evaporates, so that above the yarn between the yarn and the laser a cloud of the evaporated yarn material and / or the fiber accompanying materials is formed, this cloud being additionally and / or exclusively cracked Contains fiber or fiber accompanying material.
  • This cracked material consists essentially of ionized particles and electrons.
  • the electrons are accelerated by the laser light (inverse braking radiation) and, as high-energy particles, when they strike the outer individual filaments or individual fibers of the yarn, the polymer fiber material is melted at the points of impact and, after subsequent solidification, the outer individual filaments or individual fibers of the Sewing threads are fused together via the connection areas.
  • the method according to the invention has a number of advantages. So it allows a fast and economical production of one provided with connection areas Yarns without loss of strength of the starting yarn used. In addition, the outlay on equipment required is minimal, since only a suitable transport device for the yarn moved relative to the laser beam and a corresponding laser are required to carry out the method. The efficiency of such a treatment is also very high, since the yarn to be treated and the atmosphere surrounding it are not heated, but the energy required for the evaporation of the fiber substrate or the accompanying fibers is predominantly or exclusively supplied to the outer layers of the yarn over the yarn cross section is, so that no appreciable heating of the individual fibers or individual filaments of the yarn inside occurs.
  • laser beams used in the method according to the invention are suitable which generate the cloud of fiber substance or fiber accompanying substance described above and which are absorbed by the particles contained therein (ionized particles and electrons).
  • Laser beams with a wavelength> 900 nm are preferably used, with particularly good results using Laser beams could be achieved which have a wavelength of 1,060 nm or 10,600 nm.
  • Laser beams with a wavelength> 900 nm produce gas or solid-state lasers, such as CO2 ⁇ , CO ⁇ , neodymium-yag or neodymium glass lasers, preferably using CO2 ⁇ or neodymium-yag laser in the method according to the invention.
  • Very short pulse times are preferably selected as pulse times for the pulsed laser beams, since with longer pulse times there is the risk that undesirably large connection areas arise on the one hand and undesired damage to the sewing thread cannot be excluded on the other hand.
  • pulse times of less than 10 ms lead to excellent results.
  • the pulse frequency of the laser beams can vary within a wide range depending on the desired effect, for example between approximately 1 Hz and approximately 30 KHz.
  • the frequency of the connection areas per unit length is controlled in the method according to the invention.
  • the pulse frequencies that are between approximately 5 kHz and approximately 10 kHz. Pulse frequencies which are approximately 1 kHz and approximately 5 Hz are preferably used at lower yarn speeds.
  • connection areas for example between 200 and 300 connection areas per m of sewing thread
  • pulse frequencies in the range from about 1 KHz to about 3 KHz are required, in particular at sewing thread speeds between about 80 m / min and about 120 m / min.
  • the energy density per pulse is decisive for the formation of the connection areas.
  • the energy density of a laser beam pulse can be varied between approximately 5 J / cm2 and approximately 50 KJ / cm2, with the titer customary for polyester sewing threads between approximately 100 Dtex and about 350 Dtex energy densities between about 5 J / cm2 and about 300 J / cm2, preferably between about 60 J / cm2 and about 200 J / cm2, give excellent results.
  • the power of the laser beams used is between approximately 100 W and approximately 1000 W, preferably between approximately 300 W and approximately 600 W. Accordingly, the power density of the pulsed laser beams is in a range between approximately 0.5 MW / cm2 and approximately 5 MW / cm2.
  • a suitable finishing agent is applied to the sewing thread before the laser beam treatment, which on the one hand evaporates very easily and on the other hand absorbs so much energy from the laser beams that the ionized particles and electrons required for production are produced in high concentration.
  • Organic compounds such as phosphoric acid esters, carboxylic acids or derivatives, or inorganic compounds, such as graphite, are particularly suitable for this.
  • the concentration of such a finish lies between 0.01% and about 1%, preferably between 0.1% and 0.5%, in each case based on the yarn weight.
  • Such finishing agent also has the advantage that it simultaneously prevents electrostatic charging of the sewing thread, so that spreading of individual fibers or individual filaments of the sewing thread does not occur during the irradiation.
  • the sewing thread designed according to the invention can also be produced by a further method.
  • the sewing thread is irradiated with laser beams in the permanent state, a perforated mask being arranged above the irradiated surface of the sewing thread, ie between the sewing thread and the laser generating the laser beams.
  • the perforated mask has a large number of holes and shields the sewing thread to be irradiated in such a way that only certain sections of the sewing thread forming the connecting areas are irradiated.
  • the laser beams have energy densities between about 0.5 J / cm2 and about 7 J / cm2.
  • Laser irradiation of polyester sewing threads with the above-mentioned titers with an energy density between about 3 J / cm2 and about 5 J / cm2 led to excellent results, and there is no undesirable drop in strength at these energy densities for the selected sewing threads.
  • a shadow mask in which the holes in the mask have a hole spacing between approximately 0.1 mm and approximately 20 mm, preferably a spacing between approximately 4 mm and 10 mm.
  • the diameter of the holes in the shadow mask varies between approximately 50 ⁇ m and approximately 500 ⁇ m, in particular between approximately 70 ⁇ m and approximately 150 ⁇ m. This ensures that only relatively few individual filaments or individual fibers arranged on the outside of the sewing thread, for example between approximately one individual element or one individual fiber and approximately four individual filaments or individual fibers, are melted by the laser beams.
  • such a shadow mask allows the connection areas to be adapted to the titer of the individual filaments or individual fibers by varying the diameter of the holes.
  • the irradiation of the sewing thread must take place in a state in which it is not moved relative to the laser beams.
  • This can be achieved, for example, by covering the laser beams during the transport of the yarn, since otherwise connecting areas would be formed which would extend in the axial direction.
  • one can, for example, move the shadow mask relative to the yarn in such a way that the laser beams passing through the holes no longer strike the yarn.
  • deflected laser beams can then be deflected by means of suitable reflection devices, for example dielectric mirrors, in such a way that they impinge on the yarn side opposite the side mask or arranged laterally therefrom, so that as a result the connecting areas are uniformly distributed over the yarn circumference.
  • suitable reflection devices for example dielectric mirrors
  • Such a deflection is particularly easy to achieve when using a circular perforated diaphragm which is rotatably mounted relative to the direction of transport of the sewing thread in such a way that the laser beams passing through the holes in the perforated mask no longer strike the yarn side facing the laser even when rotated through a relatively small angle of rotation .
  • the sewing thread treated by the method according to the invention is usually dyed after the laser beam treatment.
  • a laser beam treatment before dyeing proves to be particularly advantageous in such cases if, as described above, the yarn is finished or a carbon fiber is also spun.
  • the method according to the invention can also be carried out on the already dyed sewing thread.
  • Such a laser irradiation carried out after the dyeing can be carried out particularly economically in such cases if one selects the embodiment of the method according to the invention in which the sewing thread is softened before the irradiation, since the softening after and after dyeing, for example, is easy and particularly uniform the sewing thread can be applied.
  • FIGS. 1 and 2 of the drawing show a microscopic image on a scale of 1: 100 of a sewing thread designated 1 in total.
  • the sewing thread 1 consists of a polyester multifilament thread with a total titer of 250 dtex, the individual filaments 3 of which are interwoven with one another as a result of the formation of the sewing thread 1.
  • the sewing thread 1 has in particular 64 individual filaments.
  • connection areas 2a, 2b and 2c As can be seen from FIGS. 1 and 2, the sewing thread has a multiplicity of connecting regions 2 which are distributed irregularly over the length and the circumference of the sewing thread 1. It can be seen particularly well in FIGS. 1 in connection areas 2a, 2b and 2c as well as in FIG. 2 in connection area 2d that these connection areas 2a to 2d each glue individual filaments arranged on the outside in relation to yarn 1. Overall, it can further be seen from the two figures that the majority of the connection areas 2 are arranged on the surface of the sewing thread 1. Finally, an area surrounded by 4 can be seen in FIG. 1, in the center 5 of which two connecting areas 2e and 2f are arranged, which are located further inward relative to the surface of the yarn 1, i.e.
  • connection regions 2a to 2e varies in the exemplary embodiment shown in FIGS. 1 and 2 and lies in the axial direction between approximately 0.1 mm and 0.5 mm and in the circumferential direction between approximately 0.1 mm and approximately 0.3 mm.
  • thread sections 6 FIG. 2
  • connection areas are essentially spherical, which is most clearly evident, for example, from the connection area 2a, 2f or 2d.
  • the connecting regions 2a to 2f usually have a diameter which corresponds to approximately 0.5 times to approximately 2 times the diameter of the individual filaments 3.
  • a connection area 2c can be seen in particular in FIG. 1, the size of which corresponds approximately to four times the value of the diameter of the individual filaments 3.
  • a connection region 7 can be seen in FIG. 2, which is hardly larger than a single filament.
  • connection area in FIGS. 1 and 2 consists of polyester, which could be demonstrated by dyeing tests with suitable dyes and by dissolving tests with the solvents known from conventional fiber analysis.
  • the extent to which a chemical change in the material in the connection areas 2a to 2f and 7, for example oxidation, crosslinking or chain length degradation, has taken place could not be demonstrated due to the lack of insulation processes.
  • the embodiment of the yarn described above in FIGS. 1 and 2 has a structure in which the connecting regions 2a to 2f and 7 are distributed completely unevenly over the length of the yarn and its circumference.
  • a further embodiment of the sewing thread in which the sewing thread has zones in which an accumulation of connection areas is provided.
  • yarn areas between adjacent zones which are either further connection areas, but in a smaller number than in the zones, or are almost free of connection areas. Since this is a different embodiment than the embodiment of the yarn described in detail with reference to FIGS. 1 and 2, the connecting areas, viewed in the axial direction and in the circumferential direction of the yarn, naturally have different distances, as mentioned above.
  • FIG. 3 schematically shows a process variant for producing the sewing threads described above and partially shown in FIGS. 1 and 2.
  • the sewing thread 1 is continuously transported at a speed V g in the direction of the arrow.
  • Yarn guiding devices 2 as well as a deflection roller 3, which is equipped with a hysteresis brake, ensure perfect yarn transport under a defined yarn tension during the laser irradiation.
  • a laser not shown, is arranged above the sewing thread and generates pulsed laser beams with a total diameter of 16 mm. These laser beams are focused via a converging lens 4 arranged in the beam path, the yarn 1 not being arranged in the focal point but at a distance a therefrom.
  • the energy supplied by laser during the irradiation of the yarn 1 forms a above the yarn 1 Cloud 5 of vaporized fiber or fiber accompanying material, which additionally has ionized particles and electrons (plasma).
  • This cloud 5 absorbs the energy of the laser light and contains high-energy electrons which strike the yarn 1 and there, with the formation of the connecting areas 2a-2f (FIGS. 1 and 2), bring about the external bonding of the individual filaments.
  • the yarn speed V g and the conditions of the irradiation for example wavelength, power, energy density, pulse frequency, pulse duration), the number of connection areas, the size and their distribution can be controlled.
  • FIG. 4 schematically depicts a method for producing the sewing threads described above.
  • the sewing thread 1 is treated with laser beams 2, which are generated by a laser, not shown.
  • a perforated mask 3 is provided above the yarn 1 and is provided with a multiplicity of holes 4.
  • the holes 4 have the above-described diameters and cause only partial beams 5 of a certain dimension to reach the yarn 1, which then, as already described several times above, produce the connection areas shown in FIGS. 1 and 2 and designated by 2.
  • the sewing thread 1 is transported in the direction of the arrow 6 by the distance A and irradiated again.
  • the laser beams 2 can be blocked, for example by suitable reflection devices or absorption devices, so that the partial beams 5 do not strike the yarn 1. It is also possible to use a laser whose continuous laser light is only generated periodically, the period being matched to the yarn speed.
  • connection areas are arranged either irregularly over the yarn length or in zones with an accumulation of connection areas.
  • the material of the perforated template 3 basically any material is suitable which does not absorb laser beams of the specified wavelength and thus does not heat up. Particularly good results could be achieved with a shadow mask made of oxygen-free copper, the oxygen content in this material being below 20 ppm.
  • a material reflecting the laser light can be used, the reflected laser beams being reflected by suitable deflection devices in such a way that, viewed over the circumference of the yarn 1, they enable the same to be treated on all sides.
  • Irradiation cells 10 can be used for this purpose, for example, through which the yarn is introduced and the walls of which reflect the laser beams onto the yarn, as is indicated schematically in FIG. 3.
  • a polyester multifilament yarn with a total titer of 650 dtex and an elementary thread count of 132 individual filaments which by interlacing a first multifilament yarn with a titer of 500 dtex and an elementary thread count of 96 single filaments (core) with a second multifilament yarn with a titer of 100 dtex and an elementary thread count of 36 individual filaments (sheath) was treated with pulsed laser beams.
  • the sewing thread was guided at a distance of 1.5 mm from the focus of the laser optics at a thread speed of 160 m / min.
  • As a laser a CO2 laser was used at a wavelength of 10,600 nm.
  • the pulse frequency was 1750 Hz and the pulse duration was 70 ⁇ sec. 175 J / cm2 was selected as the energy density.
  • the sewing thread was conventionally dyed and finished.
  • Comparative sewing tests on an industrial scale showed that the frequency of thread breakage with the irradiated sewing thread was 35% lower than with a same, non-irradiated sewing thread.
  • the comparative strength tests for the previously mentioned sewing threads showed that the irradiated sewing thread had a strength that was 15% higher.
  • connection areas were arranged irregularly over the yarn length and the yarn circumference. Their number was 1,800 connection points / m, this value representing a statistical mean value, which was obtained by counting 50 1 cm long thread sections in different areas of the treated sewing thread.
  • the sewing thread described in Example 1 was additionally provided with a turn of 150 turns / m before dyeing.
  • the sewing thread described in embodiment 1 was treated with a finishing agent based on a phosphoric acid ester derivative before the laser beam treatment, the finishing agent amounting to 0.2% by weight, based on the weight of the thread.
  • the laser beam treatment according to embodiment 1 was then carried out. During the laser irradiation, as in embodiment 1, fine flame formation and steam development were visually discernible due to the evaporation of the yarn material and the finishing agent, the flame formation being higher in the finished yarn compared to the non-aged yarn.
  • connection points led to a statistical mean worth 2,600 connection areas per meter.
  • the strength of the finished and irradiated sewing thread was about 15% higher than that of the only irradiated sewing thread.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Polymerisation Methods In General (AREA)
  • Knitting Of Fabric (AREA)
EP89107520A 1988-05-07 1989-04-26 Nähgarn sowie Verfahren zur Herstellung desselben Expired - Lifetime EP0341487B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89107520T ATE71161T1 (de) 1988-05-07 1989-04-26 Naehgarn sowie verfahren zur herstellung desselben.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3815696A DE3815696C1 (enrdf_load_stackoverflow) 1988-05-07 1988-05-07
DE3815696 1988-05-07

Publications (2)

Publication Number Publication Date
EP0341487A1 EP0341487A1 (de) 1989-11-15
EP0341487B1 true EP0341487B1 (de) 1992-01-02

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EP (1) EP0341487B1 (enrdf_load_stackoverflow)
AT (1) ATE71161T1 (enrdf_load_stackoverflow)
DE (2) DE3815696C1 (enrdf_load_stackoverflow)
ES (1) ES2029543T3 (enrdf_load_stackoverflow)

Cited By (1)

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CN102746125A (zh) * 2012-07-27 2012-10-24 上虞市斯莫有机化学研究所 一种高纯度二苯醚及其制备方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3916127A1 (de) * 1989-05-18 1990-11-22 Kuesters Eduard Maschf Verfahren zur ausruestung von textilen flaechengebilden
DE10161419A1 (de) * 2001-12-13 2003-06-18 Temco Textilmaschkomponent Verfahren und Vorrichtung zur Herstellung eines Kombinationsgarnes
DE102006009497A1 (de) * 2006-02-27 2007-08-30 Amann & Söhne GmbH & Co. KG Konfektioniertes, mit einer Naht oder einer Stickerei versehenes Teil
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CN102746125B (zh) * 2012-07-27 2015-08-05 上虞市斯莫有机化学研究所 一种高纯度二苯醚及其制备方法

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DE58900649D1 (de) 1992-02-13
DE3815696C1 (enrdf_load_stackoverflow) 1989-08-24
EP0341487A1 (de) 1989-11-15
ES2029543T3 (es) 1992-08-16
ATE71161T1 (de) 1992-01-15

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