JP2018127737A - Interlacing apparatus for yarn and method for producing synthetic fiber using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid interlacing apparatus in which a flow of discharge air at the time of an interlace-treatment to an upstream side in a yarn traveling direction is few and which hardly generates a damage on a yarn due to fluffs and loosening .SOLUTION: The interlacing apparatus 1 for a multifilament yarn interlaces yarns at a yarn guide part by a fluid jetted from two fluid jetting holes 15 having central axes crossing on a fluid jetting hole face. On the jetting hole face and/or an opposing wall face, an exhaust hole 18 communicating with an outer space of the interlace-treatment apparatus is arranged on an upstream side of the fluid jetting hole in the yarn traveling direction. A line CD' is obtained by projecting a line CD, that is drawn from a gravity center G1 of a region surrounded by ridge lines inside the two fluid jet holes, in a plane including central axes of the two fluid jet holes, a region surrounded by the jetting hole face and the opposing wall surface, or a region surrounded by the ridge lines inside the two fluid jet holes and the jetting hole face and that is parallel to the yarn traveling direction, on a plane that passes through a contour line of the exhaust hole on the jetting hole face and/or the opposing wall surface, and the line CD' passes through a region inside the contour line of the exhaust hole.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a yarn entanglement imparting device and a method for producing a synthetic fiber using the same.

  Conventionally, in a synthetic fiber manufacturing process, a compressed fluid is sprayed onto a yarn to cause entanglement between single yarns, forming an entangled portion and a spread portion, and a yarn having a converging property is widely used as an entangled yarn. Are known. Various yarn entanglement applying devices for forming these entangled yarns have been proposed so far.

  Patent Document 1 has a narrowed portion having the smallest area in a cross section perpendicular to the yarn traveling direction of the yarn path portion, and the cross-sectional area is gently from the narrowed portion toward the yarn entrance / exit portion of the yarn path portion. A confounding device which is expanded to the above is disclosed. By providing the restrictor, the fluid flowing in the direction opposite to the yarn traveling direction can be blocked, the fluid can be actively flowed in the yarn traveling direction, and the single yarn fiber can be applied to the wall surface of the yarn path due to the slack of the yarn. Fluff due to rubbing can be suppressed. In addition, since the cross-sectional area gradually increases, the supplied fluid is rectified toward the outlet side, so that yarn disturbance due to turbulent flow is suppressed, and as a result, fluff and slack can be suppressed.

  In Patent Document 2, the cross section perpendicular to the yarn running direction has a circular or oval yarn path portion, and at both ends thereof, there are provided discharge holes for leading the fluid to the outside. An entanglement imparting device in which holes are arranged in parallel to the yarn traveling direction is disclosed. As a result, the yarn path can be reliably fixed to the center. In addition, the supplied fluid can be discharged from the discharge hole in a well-balanced manner. Further, it is possible to reduce turbulent flow that causes the occurrence of loops, particularly fluid action perpendicular to the running direction of the yarn.

JP 2013-227711 A JP-A-5-33235

  However, in the confounding imparting device disclosed in Patent Document 1, according to the knowledge of the present inventors, in the case of a high injection pressure, the flow path shape of the yarn path portion where the yarn is running is changed. In some cases, pressure fluctuations are likely to occur due to a sudden drop in flow velocity, resulting in a decrease in confounding performance and difficulty in stably providing confounding. Further, since the yarn is likely to vibrate due to the fluctuation of the fluid, the yarn may collide with the wall surface inside the nozzle, and the damage to the yarn may increase.

  Further, in the confounding imparting device disclosed in Patent Document 2, according to the knowledge of the present inventors, the discharge holes arranged on the inlet side and the outlet side of the yarn are arranged in parallel with the running direction of the yarn. Therefore, in the vicinity of the traveling yarn, a flow opposite to the traveling direction is likely to occur, and the yarn may be loosened. In addition, since the narrowed portions are provided at both ends of the yarn path portion, the fluid speed is abruptly reduced, a difference from the yarn traveling speed is generated, and yarn slack may occur. Further, since the fluid collides with the wall surfaces at both ends, air current turbulence may occur and fluff may occur.

  In view of the above problems, the present invention provides a fluid entanglement imparting device that is less likely to cause yarn damage such as fuzz and slack of yarns even under a wide range of processing pressures from low injection pressure to high injection pressure.

The multifilament yarn entanglement imparting device of the present invention that solves the above problems comprises a yarn path portion through which a yarn passes, and an injection hole surface and an opposite wall surface that face each other across the yarn path portion, and the injection hole surface Entangled multifilament yarn in which two fluid ejection holes are opened, the central axes of the fluid ejection holes intersect, and the yarns are entangled at the yarn path by the fluid ejected from the fluid ejection holes In the granting device,
The ejection hole surface and / or the opposing wall surface is provided with an exhaust hole communicating with the external space of the confounding imparting device on the upstream side in the yarn traveling direction from the fluid ejection hole,
In a plane including the central axis of the two fluid ejection holes, a ridge line inside the two fluid ejection holes, a region surrounded by the ejection hole surface and the opposing wall surface, or a ridge line and ejection inside the two fluid ejection holes G1 is the center of gravity of the area surrounded by the hole surface,
As the line CD parallel to the yarn running direction drawn from the center of gravity G1 to the upstream side in the yarn running direction, the line CD passes through the outline of the exhaust hole of the injection hole surface and / or the opposing wall surface. A line CD ′ projected onto the plane passes through a region inside the contour line of the exhaust hole. According to the multifilament yarn entanglement imparting device of the present invention, a distance T2 between a point on the side close to the center of gravity G1 and the center of gravity G1 at the intersection of the contour line of the exhaust hole and the line CD ′ is It is preferable to satisfy the following formula (1).
(1) 0.6 ≦ T2 / D1 ≦ 1.4
D1: The hole diameter of the exhaust hole on the injection hole surface and / or the opposing wall surface.

  The synthetic fiber manufacturing method of the present invention manufactures a synthetic fiber to which entanglement is imparted by imparting entanglement to the yarn using the multi-filament yarn entanglement imparting device of the present invention.

  The central axis of the fluid injection hole of the present invention is the axis passing through the center of the fluid injection hole if the cross section of the fluid injection hole is round, and the circumscribed circle in contact with the contour line of the fluid injection hole if the cross section is elliptical. An axis passing through the center.

The hole diameter of the exhaust hole of the present invention is the diameter that forms the contour line of the exhaust hole if the exhaust hole is round, and the outer diameter of the circumscribed circle that touches the contour line of the exhaust hole if it is elliptical. To do.
The upstream side in the yarn traveling direction of the present invention is the side opposite to the yarn traveling direction.

  By using the multifilament yarn entanglement imparting device of the present invention, yarn damage such as yarn fluff or slack can be prevented by suppressing the flow of fluid in the vicinity of the running yarn in the direction opposite to the yarn running direction. In addition, entanglement can be imparted even in processing with a fluid having a low injection pressure to a high injection pressure.

It is the perspective view which showed roughly the structure of the confounding provision apparatus of the yarn used for embodiment of this invention. It is a figure which shows the injection hole surface seen from the Z direction of FIG. It is sectional drawing cut | disconnected by the plane containing central axis CA and CB of FIG. FIG. 4 is an enlarged view of a yarn path passing portion in FIG. 3. It is the schematic of the yarn entanglement apparatus used for another embodiment of this invention, and is a schematic diagram of the structure which has a center groove | channel on the injection hole surface, and the exhaust hole and the center groove | channel communicated. It is a figure which shows the injection hole surface seen from the Z direction of FIG. It is sectional drawing cut | disconnected by the plane containing central axis CA and CB in FIG. FIG. 8 is an enlarged view of a yarn path passing portion in FIG. 7. It is a figure which shows an example in case an injection hole has an exhaust hole. It is a figure which shows an example of the flow path of an exhaust hole in case the disposal wall surface has one disposal hole seen from the X direction of FIG. It is the figure which showed one example of the process of manufacturing a entangled multifilament yarn by melt-spinning a polyethylene terephthalate multifilament yarn and using it for an entanglement process. It is the schematic explaining the measuring method of the exhaust pressure P1 by the side of the entrance of the yarn of the confounding provision apparatus concerning this invention, and the exhaust pressure P2 by the side of an exit.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view of a yarn entanglement imparting device used in an embodiment of the present invention, FIG. 2 is a view showing an injection hole surface viewed from the Z direction of FIG. 1, and FIG. FIG. 4 is a cross-sectional view cut along a plane including the central axes CA and CB, and FIG. 4 is an enlarged view of the yarn path passing portion of FIG. The yarn entanglement imparting device 1 according to the present invention includes a fluid supply unit 11, a fluid ejection nozzle member 12, a side plate member 13, and a spacer 14. Then, by combining the fluid ejection nozzle member 12, the side plate member 13, and the spacer 14, the yarn passage portion 17 through which the yarn passes and imparts entanglement to the yarn, and the yarn passage portion 17 and the outside communicate with each other. A slit portion 16 for introducing a yarn into the road portion 17 is formed inside the confounding device 1. The surface on the slit portion 16 side of the fluid ejection nozzle member 12 is an ejection hole surface 21, and the surface on the slit portion 16 side of the side plate member 13 is an opposing wall surface 22. In addition, when the shape of the injection hole surface 21 or the opposed wall surface 22 is not a flat surface but is uneven or curved, the average line of the roughness curve at the unevenness or curved portion is set as the average value plane, and the injection hole surface 21 and the opposite wall surface 22 are opposed to each other. The wall surface 22 is assumed.

  The fluid ejecting nozzle member 12 is formed with two fluid ejecting holes 15 that open to the slit portion 16 and eject fluid onto the traveling yarn. The two fluid ejection holes 15 are formed so that the central axis CA and the central axis CB intersect. The central axis CA and the central axis CB may intersect before reaching the opposing wall surface 22. The shape of the fluid ejection hole 15 is preferably designed to be a circle or an ellipse, and may be slightly deviated from the circle or ellipse within the range of manufacturing errors. The center axes CA and CB may intersect at right angles to the running direction of the yarn as shown in FIG. 2, or may be inclined in the running direction of the yarn.

  The yarn path portion 17 will be described in more detail with reference to FIG. The yarn path portion 17 includes an imaginary line, an injection hole surface 21 and an opposing wall surface 22 in which the inner ridge line of the two fluid injection holes 15 extends toward the opposing wall surface 22 so as to be parallel to the central axis CA and the central axis CB. It is a space extending in the yarn running direction in a region surrounded by. When the inner ridge lines of the two fluid ejection holes 15 intersect before reaching the opposing wall surface 22, the inner ridge lines of the two fluid ejection holes 15 are parallel to the central axis CA and the central axis CB. This is a virtual line extending toward the opposing wall surface 22 and a space extending in the yarn traveling direction in a region surrounded by the injection hole surface 21. The yarn passes through the space of the yarn path portion 17, and the yarn causes string vibration behavior to be entangled.

  The shape of the yarn path portion 17 is not limited to a triangle, a square, a hexagon, or the like depending on the arrangement and angle of the two fluid injection holes, or the combination of the injection hole surface 21 and the opposing wall surface 22, but also the injection hole surface 21 and the opposing wall surface. Any shape such as a spherical surface 22 may be used. Further, the injection hole surface 21 and the opposing wall surface 22 may have various shapes such as expanding from the vicinity of the fluid injection hole 15 toward the yarn traveling direction.

  Here, the principle which can suppress the flow of the fluid which goes to the direction opposite to the yarn running direction in the vicinity of the running yarn, which is an important point of the present invention, will be described.

  An exhaust hole 18 is provided in the injection hole surface 21 or the opposing wall surface 22, or both of the injection hole surface 21 and the opposing wall surface 22, and the fluid injected from the fluid injection hole 15 passes through the yarn path portion 17. Thus, it is possible to suppress the flow to the upstream side in the yarn traveling direction.

  Further, the exhaust hole 18 is arranged such that the center of gravity of the yarn path 17 is G1, the line parallel to the yarn traveling direction drawn from the center of gravity G1 to the upstream side of the yarn traveling direction is the line CD, and the line CD is When a line projected onto a plane passing through the outline of the exhaust hole 18 of the injection hole surface 21 and / or the opposing wall surface 22 is defined as a line CD ′, the exhaust hole 18 defines a region inside the outline of the exhaust hole 18 as a line CD. 'Is arranged to pass. The yarn path portion 17 may have the same distance from the center of gravity G1 to the yarn inlet side and the outlet side, and the distance to the inlet side is the distance to the outlet side. The distance to the inlet side may be shorter than the distance to the outlet side. With such an arrangement, the fluid ejected from the fluid ejection holes 15 is prevented from flowing along the traveling yarn Y as compared with the case where the exhaust holes 18 are not provided, and the fluid is appropriately exhausted. It is guided to the hole 18 and discharged to the external space through the flow path of the exhaust hole 18. Further, among the single yarns of the yarn Y opened by the fluid ejected from the fluid ejection hole 15, the single yarn upstream of the fluid ejection hole 15 in the yarn traveling direction is provided with an exhaust hole 18. This reduces the chance of contacting the wall surface at the yarn path.

  As a result, there is less damage to the yarn such as fluff and looseness of the yarn due to the upstream flow of fluid in the yarn running direction, single yarn breakage, and the single yarn wall surface contact. Of course, entanglement can be imparted even in processing at a high injection pressure. Moreover, since there is no rapid shrinkage, rapid expansion, or the like of the flow path in the slit portion 16, fluctuations in the flow velocity can be reduced, so that yarn swinging can be suppressed and wall surface contact can be reduced. Furthermore, since there is no obstacle that obstructs the flow of the fluid in the slit portion 16, the airflow turbulence can be minimized, so that the yarn swing can be suppressed.

  Here, when the line CD ′ passes through the region outside the contour line of the exhaust hole 18, the yarn path portion 17 and the exhaust hole 18 are arranged apart from each other, so that the running yarn is separated from the exhaust hole 18. When pulled by the flow of the fluid to be discharged, the edge portion which is the boundary between the exhaust hole 18 and the yarn path portion 17, the wall surface provided with the exhaust hole 18 and the yarn come into contact with each other, and entanglement is lost or uneven. In some cases, the yarn may be entangled or the yarn may be broken due to the yarn being caught at the edge. Further, when the yarn comes into contact with the wall surface of the edge portion or the yarn path portion, the single yarn breakage, the single yarn may be easily turned up or turned up, and the yarn may be damaged and the quality of the yarn may be lowered.

As shown in FIG. 2, when the distance between the center of gravity G1 and the point near the center of gravity G1 at the intersection of the contour line of the exhaust hole 18 and the line CD ′ is T2, the distance T2 And the hole diameter D1 of the exhaust hole 18 preferably satisfy the following expression.
0.6 ≦ T2 / D1 ≦ 1.4.

  Here, T2 / D1 means the relative size of the region between the fluid ejection hole 15 and the exhaust hole 18 compared to the hole diameter of the exhaust hole 18. As T2 / D1 is larger, the region between the fluid ejection hole 15 and the exhaust hole 18 becomes wider, so the yarn behavior region becomes wider and the number of entanglement increases, but the traveling yarn contacts the wall surface. The probability increases and the fluff increases. Conversely, as T2 / D1 is smaller, the region between the fluid ejection hole 15 and the exhaust hole 18 becomes narrower, so that the probability that the running yarn contacts the wall surface is reduced and fluff can be suppressed. Since the behavioral area of becomes narrower, the number of confounding decreases. If T2 / D1 is in the range of 0.6 or more and 1.4 or less, the region between the fluid injection hole 15 and the exhaust hole 18 has an appropriate size, and conventionally, the yarn damage reduction, which has a contradictory relationship, is reduced. (Suppression of fuzz) and entanglement of yarn can be achieved.

  Next, details of the form of the exhaust hole 18 in the injection wall surface 21 will be described. FIG. 9 shows various forms in which the exhaust hole 18 is formed in the injection wall surface 21. The exhaust hole 18 only needs to be provided at a position where the line CD ′ passes through the region inside the outline of the exhaust hole 18, and the shape and number of the exhaust holes 18 are not particularly limited. As shown in FIGS. 9B and 9D, the shape may be different, and as shown in FIGS. 9C and 9E, a plurality of shapes may be arranged. In this case, the turbulence of the airflow can be suppressed by setting the shape of the target around the line CD ′.

  Next, the flow path shape of the exhaust hole 18 will be described in detail. FIG. 10 shows various flow channel forms in which one exhaust hole 18 is formed in the injection wall surface 21. The center axis of the exhaust air flow path communicating with the external space of the confounding processing device from the center of gravity of the exhaust hole 18 is defined as a line CE. The flow path of the exhaust hole 18 is not required to communicate with the fluid ejection hole 15 and the fluid supply path 20, and the shape and number of the flow paths are not particularly limited. As shown in FIGS. 10A and 10B, the exhaust hole 18 may penetrate to the side surface (the upstream surface in the yarn traveling direction) of the fluid ejection nozzle member 12. As shown in (c) of FIG. 10, the top surface of the fluid ejection nozzle member 12 may be penetrated, and as shown in FIG. 10 (d), the back surface (ejection hole surface 21) of the fluid ejection nozzle member 12 may be used. It may be penetrated to the surface on the opposite side. In the case of FIG. 10C, the line CE intersects perpendicularly to the yarn traveling axis Y. Moreover, as shown to (e) of FIG. 10, (f), you may penetrate to the corner | angular part of an upper surface and a side surface. The channel shape may be a cylindrical shape with a constant cross-sectional area, but may be a conical shape with a gradually increasing cross-sectional area as shown in FIG. Moreover, as shown in FIG.10 (f), the shape where the cross-sectional area increased gradually may be sufficient.

  Next, a yarn entanglement imparting device used in another embodiment of the present invention will be described with reference to FIGS. The yarn entanglement imparting device 1 of the present invention preferably has a central groove 23 extending along the yarn traveling direction on the injection hole wall surface 21 and / or the opposing wall surface 22. As shown in FIG. 6, the center groove 23 starts from a position after a distance T from the upstream yarn path start point in the yarn traveling direction and reaches the downstream end point of the yarn path. The central groove 23 and the exhaust hole 18 communicate with each other.

  Here, the distance T is preferably L / 10 ≦ T ≦ L / 2, where L is the total length of the yarn path portion. When T is L / 10 or more, it is possible to secure a certain length in a region where the distance between the injection hole surface 21 and the opposite wall surface 22 on the upstream side in the yarn traveling direction is short, so that the region flows upstream in the yarn traveling direction. Fluid can be suppressed. As a result, the movement of the yarn to the upstream side in the yarn traveling direction can be more effectively suppressed. As a result, the slack of the yarn and the abrasion of the yarn with the injection hole surface 21 and the opposing wall surface 21 on the upstream side in the yarn traveling direction can be further reduced, and damage such as fluff and single yarn breakage can be further reduced. In addition, when T is L / 2 or less, the region of the central groove 23 can be secured to a certain length, so that the behavior region of the yarn when entangled can be widened, and the behavior range of each single yarn becomes large, It is possible to realize a entangled form in which more uniform entanglement is imparted, the number of entanglements is increased, and the bundling of each bundling portion is strong.

  FIG. 11 is a schematic view of a process for producing a fluid entangled multifilament yarn by melt spinning the polyethylene terephthalate multifilament yarn used in Examples described later and subjecting it to fluid entanglement. The oil supply guide 31 applies an oil agent in order to improve process passability of multifilament yarn spun from a spinneret (not shown). The first hot roller unit 32 and the second hot roller unit 33 draw and convey multifilament yarns at a take-up speed of around 3,000 m / min. The winder 34 draws and conveys multifilament yarns It is a roll that winds up.

  Next, the multifilament yarn obtained by the yarn entanglement imparting device of the present invention may be a fiber composed of a single component polymer, or may be a fiber in which two or more kinds of polymers are combined. Here, it is needless to say that the two or more types of polymers referred to in the present invention include the use of two or more types of polymers having different molecular structures such as polyester, polyamide, polyphenylene sulfide, polyolefin, polyethylene, and polypropylene. However, matting agents such as titanium dioxide, silicon oxide, kaolin, anti-coloring agents, stabilizers, antioxidants, deodorants, flame retardants, yarn friction reducing agents, coloring, as long as the yarn-making stability is not impaired. Examples include various functional particles such as pigments and surface modifiers, additives such as organic compounds, and different amounts of particles added, different molecular weights, and copolymerization.

  In addition, the cross section of the single filament of the multifilament yarn obtained by the yarn entanglement imparting device of the present invention may be a round shape, a triangular shape other than a round shape such as a triangle, a flat shape, or a hollow shape. It may be a blended yarn having an irregular cross section. Further, the present invention is an extremely versatile invention, not particularly limited by the single yarn fineness, not particularly limited by the number of single yarns, and is not particularly limited by the number of yarns, One yarn may be sufficient, and multiple yarns of two or more yarns may be sufficient.

  Next, the fluid used in the present invention is most preferably compressed air, but is not limited thereto, and may be non-compressed air, or may be a gas such as steam or nitrogen, or a mixed gas.

  Hereinafter, the effects of the present embodiment will be described in detail using examples. First, in the confounding imparting device, the change in the exhaust pressure of the compressed air exhausted out of the confounding imparting device was measured depending on the presence or absence of the exhaust hole.

  In this examination, the confounding imparting apparatus shown in FIGS. 1 and 2 was used. The diameter D1 of the exhaust hole 18 in Example 1 was a circular shape of 3 mm. The distance T2 was 3 mm. The diameter of the fluid ejection hole 15 is a circle having a diameter of 0.9 mm, and the plane including the central axes CA and CB of the two fluid ejection holes 15 is perpendicular to the running yarn, and CA and CB form. The angle is 90 degrees, the yarn path length L is 12 mm, and the injection wall surface 21 and the opposing wall surface 22 do not expand toward the upstream side and the downstream side in the yarn running direction, and are parallel and smooth surfaces. The spacer thickness H for adjusting the gap between the injection wall surface 21 and the opposing wall surface 22 was 0.2 mm. Comparative Example 1 has the same configuration and dimensions as Example 1 except that there is no exhaust hole 18.

(1) Exhaust pressure on the outlet side and the inlet side of the confounding device:
Measurement of the upstream exhaust pressure P1 and the downstream exhaust pressure P2 in the yarn running direction of the entanglement imparting device when compressed air was injected from the fluid ejection holes 15 was performed. FIG. 12 shows a schematic diagram of the exhaust pressure measurement. P1 and P2 indicate pressure gauges, and L1 is a distance from the center of gravity G1 of the confounding imparting device to the pressure gauges P1 and P2, respectively. For measurement of the exhaust pressure, a handy manometer PG-100 manufactured by Nidec Copal Electronics Co., Ltd. was used, and the distance L1 was 9 mm.

  Table 1 shows the measurement results at each pressure and the exhaust pressure difference ΔP (= P2−P1) under the conditions that the set pressure for fluid injection is 0.2, 0.3, 0.4, and 0.5 MPa. Indicated.

(2) Convergence (measurement and determination of the number of confounding):
The number of entanglements was measured for the multifilament yarns obtained in the examples and comparative examples. As a measuring device, an automatic continuous entanglement tester R-2072 manufactured by Rosshield was used. The pretension is set to 10 cN, the trip tension is set to 17 cN, the number of setting coefficient entangled parts is set to 20, the sample yarn is run, and the yarn length required to count 20 entangled parts (running yarn length) Measurements were made to determine the average length from the entangled part to the next entangled part.

  Further, the average value of the above lengths was converted into the number of entanglements per 1 m of yarn length, and this converted value was obtained as “number of entanglements per 1 m of yarn length”. In the measurement, the average value was obtained by setting the n number to 20 times.

  In the determination of the number of entanglements, the number of entanglements per 1 m of yarn is expressed as “bad” in Table 2 as “bad”, and 3 or less and less than 6 as “slightly unachieved” in Table 2, “△” 6 or more and less than 10 were marked as “good” in Table 2 with ◯, and 10 or more were marked as “best” in Table 2 with “◎”. “Best” and “good” were accepted, and “slightly not achieved” and “bad” were rejected.

(3) Package quality (measurement and determination of the number of fluff):
The number of fluffs was measured for the multifilament yarns obtained in the examples and comparative examples. A fluff counting device DT-105 manufactured by Toray Engineering Co., Ltd. was used as a measuring device. The detection height is set to 0.5 mm by the S-type detector, the unwinding speed of the package is set to 500 m / min, the yarn length of 10,000 m is measured, and the fluff present per 10,000 m length of the yarn is measured as it is. Calculated as a number.

  The number of fluff is judged as “bad” when the number of fluffs per 10,000 m length of the yarn is “bad” and expressed as “x” in Table 2, and 1.5 or more and less than 3 is “slightly unachieved”. In Table 2, "△" is indicated, 1 to less than 1.5 is indicated as "Good", in Table 2, "○" is indicated, and less than 1 is indicated as "Best" as "◎" . “Best” and “good” were accepted, and “slightly not achieved” and “bad” were rejected.

(4) Overall evaluation:
The overall evaluation reflected the lower evaluation results for both convergence and package quality in the overall evaluation. “Best” and “good” were accepted, and “slightly not achieved” and “bad” were rejected. Table 2 shows the configuration of confounding imparting apparatuses in Examples 1 to 7 and Comparative Example 1, and the results of convergence, package quality, and comprehensive evaluation.

(Example 1, Comparative Example 1)
Using the entanglement imparting device of Example 1 and Comparative Example 1, multifilament yarn was actually collected with the outline of the process shown in FIG. Polyethylene terephthalate having a modified cross section of 84 dtex and 36 filaments was melt-spun and subjected to a fluid entanglement treatment, and a wound multifilament yarn was collected at a winding speed of 3000 m / min. The set pressure for fluid ejection was 0.3 MPa.

(Example 2, Example 3)
In Example 2, the effect when the central groove is installed in the fluid ejection nozzle member and the effect when the constricted portion of the opposing wall surface is installed in Example 3 will be described. Example 2 is the same as Example 1 except that a central groove (V-groove shape with a volume of 9 mm ³ ) is arranged. In Example 3, a constricted portion in which the gap between the jetting wall surface and the opposing wall surface is shorter than the fluid jetting hole in the yarn running direction is disposed between the jetting wall surface and the opposing wall surface. The second embodiment is the same as the second embodiment except that the shape expands toward the downstream side and the upstream side in the direction. In addition, the gap between the jetting wall surface and the opposing wall surface in the throttle portion was set to a spacer thickness H of 0.2 mm, and the jetting wall surface was parallel to the running axis Y of the running yarn and was a smooth surface. A multifilament yarn was collected under the same conditions using the same entanglement applying device as in Example 1 except for the central groove and the drawn portion.

(Example 4, Example 5, Example 6, Example 7)
In Examples 4, 5, 6, and 7, the effect of Formula (1) 0.6 ≦ T2 / D1 ≦ 1.4 will be described. Except for T2 of Example 4, 1.8 mm, T2 of Example 5, 4.2 mm, T2 of Example 6, 0.9 mm, and Example 7 T2 of 5.4 mm Was used to collect multifilament yarns under the same conditions.

  The following conclusions were obtained from Table 1. The entanglement imparting device according to the first embodiment exhausts compressed air from the exhaust hole by providing the exhaust hole, so that the ejection pressure from the fluid ejection hole is low (0.2 MPa) to high (0.5 MPa). As a result, the exhaust pressure P1 on the inlet side becomes lower than the exhaust pressure P2 on the outlet side, and the compressed air flowing upstream in the yarn traveling direction can be suppressed. On the other hand, the confounding imparting device of Comparative Example 1 is not provided with an exhaust hole, and the exhaust pressure P1 on the inlet side and the exhaust pressure P2 on the outlet side are substantially equal regardless of the ejection pressure from the fluid ejection hole. Compared to Example 1 with holes, there is more compressed air flowing upstream in the yarn traveling direction.

  From Table 2, the following conclusions were obtained. In Example 1, the number of entanglements was 11.6 / m and the number of fluffs was 0.5 / m. Both the convergence and the package quality were evaluated as “best”. In Example 2 in which the central groove is provided in the configuration of Example 1, the number of entanglements is increased to 14.3 / m and the number of fluffs is decreased to 0.3 / m. In addition, both convergence and package quality were evaluated as “best”. In Example 3 in which the constricted portion is provided in the configuration of Example 2, the number of entanglement was 12.4 / m, which was less than that in Example 2, but the number of fluff was further reduced to 0 / m, and the focusing property was reduced. The package quality was evaluated as “best”.

  In Example 4, since the value of T2 / D1 was smaller than that in Example 1, the number of entanglements was slightly reduced to 10.4 / m as compared with Example 1, but the number of fluff was 0. It was 4 / m, and the convergence and package quality remained “best”. In Example 6, since the value of T2 / D1 was less than 0.6, the number of entanglement was further decreased to 8.1 / m2, and the evaluation of convergence was “good”. The package quality remained at the “best” evaluation.

  In Example 5, since the value of T2 / D1 was larger than that in Example 1, the number of fluffs slightly increased to 0.7 / m as compared with Example 1, but the number of entanglements was 10 The evaluation was “best” in terms of convergence and package quality. In Example 7, since the value of T2 / D1 was larger than 1.4, the number of fluff was further increased to 1.3 pieces / m, and the evaluation of the package quality was “good”. Was 12 / m, and the convergence was still evaluated as “best”.

1: Entangling device 11: fluid supply unit
12: Fluid ejection nozzle member 13: Side plate member
14: Spacer 15: Fluid injection hole 16: Slit part 17: Yarn path part 18: Exhaust hole
19: Fluid introduction path 20: Fluid supply path 21: Injection hole surface 22: Opposing wall surface 23: Central groove 31: Oil supply guide
32: First hot roller unit 33: Second hot roller unit 34: Winding machine G1: Center of gravity of the yarn path portion L: Yarn path length T: Center from the upstream side of the yarn path portion in the yarn traveling direction Distance to groove start point Y: Yarn travel axis H: Spacer thickness CA: Center axis of fluid injection hole 15 CB: Center axis of fluid injection hole 15

Claims (3)

A yarn path portion through which the yarn passes, and an injection hole surface and an opposite wall surface facing each other across the yarn path portion, and two fluid injection holes are opened in the injection hole surface, and the center of the fluid injection hole In the entanglement imparting device for multifilament yarn, the axes intersect and impart entanglement to the yarn at the yarn path portion by the fluid ejected from the fluid ejection hole,
The ejection hole surface and / or the opposing wall surface is provided with an exhaust hole communicating with the external space of the confounding imparting device on the upstream side in the yarn traveling direction from the fluid ejection hole,
In a plane including the central axis of the two fluid ejection holes, a ridge line inside the two fluid ejection holes, a region surrounded by the ejection hole surface and the opposing wall surface, or a ridge line and ejection inside the two fluid ejection holes G1 is the center of gravity of the area surrounded by the hole surface,
As the line CD parallel to the yarn running direction drawn from the center of gravity G1 to the upstream side in the yarn running direction, the line CD passes through the outline of the exhaust hole of the injection hole surface and / or the opposing wall surface. A multifilament yarn entanglement imparting device in which a line CD ′ projected onto a plane passes through a region inside the contour line of the exhaust hole. The distance T2 between the point on the side close to the center of gravity G1 at the intersection of the contour line of the exhaust hole and the line CD ′ and the center of gravity G1 satisfies the following expression (1). Multifilament yarn entanglement device.
(1) 0.6 ≦ T2 / D1 ≦ 1.4
D1: Hole diameter of the exhaust hole on the injection hole surface and / or the opposing wall surface   A method for producing a synthetic fiber, wherein a synthetic fiber to which entanglement is imparted is produced by imparting entanglement to the yarn using the multifilament yarn entanglement imparting device according to claim 1.

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