JP2009068154A - Yarn cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a yarn cooling apparatus capable of changing blowout length corresponding to brand, especially brand having a thick fineness, in a cylindrical yarn-cooling apparatus. <P>SOLUTION: The yarn cooling device 3 is installed under a spinneret 1 having a spinning hole group bored multiple concentrically in order to extrude a melted thermoplastic polymer and spin the polymer as a multifilament and a yarn, and further, a cylindrical cooling air-blowing surface for radially blowing out cooling air for cooling a spun yarn 2 traveling the interior from the outer peripheral side to the inner peripheral side of yarn. In the yarn cooling device, a cooling length-regulating member 11 capable of freely regulating the length of the blowing out cooling air from cooling air-blowing out face is fitted and inserted from the lower end along the inner wall face and/or the outer wall face of the cylindrical cooling air blowing surface so that cooling length of the cooling air-blowing surface is adjustable. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a yarn cooling device used when melt spinning a synthetic fiber made of a thermoplastic polymer such as polyester, polyamide, or polyolefin.

  The method of cooling the yarn after melt-extruding the thermoplastic polymer from the discharge nozzle is a general process for producing synthetic fibers. The synthetic fiber cooling process plays an important role in obtaining high-quality yarns, and especially in the melt spinning process of garment long fibers, it has a great influence on the yarn strength, elongation and dyeing properties after spinning. Is conventionally known.

  In particular, in recent years, a large number of thin single fibers (filaments) have been spun from a single die, and it has become possible to produce fibers having a single fiber fineness of 0.3 dtex or less. In this way, in the process of spinning a large number of thin yarns from a single die, it is very important to control the fineness of the yarn, and there is a technique for stably producing a homogeneous yarn. is necessary.

  Therefore, in the conventional technology, as disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 7-97709) and Patent Document 2 (Japanese Patent Laid-Open No. 2000-34615), the fineness of single fibers and the single fibers Many techniques have been proposed for solving the problems associated with the increasing number of books.

  However, in these conventional techniques, a cooling device for supplying cooling air in one direction from the side to the traveling yarn is arranged directly under the base, and cooling air having a certain length along the traveling direction of the yarn. Focusing on the supply of cooling air with uniform and constant air speed, control of the accompanying airflow around the running yarn, and control of the turbulence of cooling air supplied from the yarn cooling device Measures have been taken.

  Furthermore, supply a cooling air by installing a wire net, punching plate, porous metal, etc. on the air outlet surface of the cooling device so that the air velocity is constant over the entire air outlet surface and the cooling air is not disturbed. A method of controlling the turbulence of the air flow using various pressure resistance low bodies, and further installing a rectifier between the cooling device and the yarn to supply a uniform air flow to the yarn. Has been used since ancient times.

  In the prior art described above, the cooling air supplied to cool the yarn spun from the cooling device is set to a uniform and constant wind speed, and various rectifiers are used after the air flow is supplied. Control. Nevertheless, especially in the melt spinning of ultra-fine multifilament yarns, the problems of fineness spots and dyeing spots cannot be improved, and therefore there is a need to further improve the cooling process in the melt spinning process. Yes.

  In order to solve this problem, there is a method using a technique proposed in Japanese Patent Application Laid-Open Nos. 2004-300614 and 2003-253522. In this method, a spun yarn consisting of a large number of single fibers is introduced into a cylinder of a cooling air blowing device having an independent cylindrical shape, and the cooling air is blown out radially from the cylindrical cooling air blowing surface. It is intended to cool the strip.

  This technique has been used in the past as a process for melt spinning staple fibers and industrial fibers. However, in the process of emphasizing physical properties such as dyeing and texture as in the case of garment long fibers, the above-described cylindrical yarn cooling device has recently been used.

  Certainly, by using a cylindrical yarn cooling device, the distance between the spinning yarn to be cooled and the cooling air blowing surface can be kept small, and the single fiber fineness is very small, Moreover, even if the spun yarn has a very large number of single fibers, the cooling air can be supplied radially so as to wrap around the spun yarn. For this reason, the heat exchange efficiency between the cooling air and the spun yarn is greatly improved, so there is no need to increase the flow velocity of the cooling air, and the cooling spots and fineness spots caused by the yarn swaying by the cooling air are large. Improved.

  However, when this cylindrical yarn cooling device is applied to the spinning process of garment long fibers, there are still some problems that must be solved. For example, this cylindrical yarn cooling device has been developed as an ultrafine fiber application, and generally has a problem that the cooling air blowing length is short. For this reason, in order to diversify the brand, there is a problem that the cooling length is insufficient when a brand having a large fiber diameter with a large fineness is melt-spun.

Japanese Patent Application Laid-Open No. 07-097709 JP 2000-034615 A JP 2004-300614 A JP 2003-253522 A

  In view of the problems of the conventional technology described above, the problem to be solved by the present invention is to provide a cylindrical yarn cooling device that surrounds the spun yarn and supplies cooling air radially from the outside. When producing high-quality yarn by applying it, it is possible to change the yarn cooling device flexibly and easily even if it becomes necessary to melt-spin from single fiber diameter to thick fiber as the number of brands increases. An object of the present invention is to provide a yarn cooling device excellent in production efficiency.

Here, as an invention for solving the above-mentioned problems, “spinning having a group of spinning holes perforated on multiple concentric circles for discharging molten thermoplastic polymer and spinning it as multifilaments and yarns” A cylindrical cooling air blowing surface that is disposed below the base and further blows out a cooling air for cooling the spun yarn running inside the die from the outer peripheral side to the inner peripheral side of the yarn. In the yarn cooling device provided with
A cooling length adjusting member capable of adjusting the blowing length of the cooling air blown from the cooling air blowing surface is inserted from the lower end along the inner wall surface and / or outer wall surface of the cylindrical cooling air blowing surface, and the cooling length of the cooling air blowing surface is set. Yarn cooling device characterized by being adjustable. Is provided.

  Synthetic fiber production equipment using a cylindrical thread cooling device can obtain a thread with a small difference in physical properties between spindles, especially when cooling ultrafine multifilament thread. When trying to cool the thread, it was necessary to significantly modify the yarn cooling device.

  However, in the cylindrical yarn cooling device according to the present invention, the specification is such that the blowout length of the cooling air can be easily and easily changed without such a large facility modification. For this reason, a single cylindrical yarn cooling device can flexibly handle a wide variety of brands from brands with small fineness (thin single fiber diameter) to brands with large fineness (thick single fiber diameter). As a result, it is possible to achieve a particularly remarkable effect that productivity can be improved and production cost can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic overall configuration diagram illustrating an embodiment of a melt spinning apparatus to which a yarn cooling device according to the present invention is applied. In FIG. 1, a spinneret 1 is attached to a melt spinning apparatus, and a multifilament yarn 2 (hereinafter simply referred to as “yarn 2”), which is a synthetic fiber made of a thermoplastic polymer such as polyester, polyamide, or polyolefin, from the die 1. Is called).

  At this time, a cylindrical yarn cooling device 3 for cooling the spun yarn 2 is disposed below the base 1, and an upper end portion of the yarn cooling device 3 A partition plate 5 having a passage hole through which the spun yarn 2 passes is provided, and a seal structure 4 is provided between the partition plate 5 and the base 1. . Accordingly, the seal structure 4 and the partition plate 5 cooperate with each other so that the cooling air or the like does not enter the spinning region immediately below the base 1 (the slow cooling region without forced cooling by the cooling air). Has been.

  At that time, the yarn cooling device 3 is provided with a cooling air blowing surface 6 having a cylindrical shape for blowing cooling air, and the cooling air blowing surface 6 rectifies the blowing direction of the cooling air in the radial direction. A cylindrical rectifier 6 is also provided for making the blowing flow rate uniform. Therefore, the cooling air is blown out radially from the cylindrical cooling air blowing surface 6 toward the center of the cylinder at a uniform flow rate. The cooling air blown out is a slow cooling zone directly below the spinneret (the zone where the spun yarn is cooled at the ambient temperature as it is, not forced cooling by the cooling air) by the action of the partition plate 5 already described. It goes without saying that entry into the is hindered.

  In addition, as the nozzle | cap | die 1 used for this invention, it is desirable to use the thing by which many polymer discharge holes (spinning hole) were drilled on the multiple concentric circle group which consists of a double to triple concentric circle group. This is because in the yarn cooling device 3 according to the present invention, cooling air is blown out radially from the cylindrical cooling air blowing surface 6. As a result, in the cooling process of the multifilament yarn 2 composed of a single fiber group spun from the base 1 into a multi-cylindrical shape, cooling spots do not occur between the single fibers, and more uniform cooling is possible. It is.

  Under the circumstances as described above, when the multifilament yarn 2 composed of a single fiber group spun from the base 1 into a multi-cylindrical shape is introduced into the yarn cooling device 3, the above-described cylindrical shape is obtained. For example, in the case of polyester fiber, the cooling air blown radially from the cooling air blowing surface 6 is cooled to a glass transition point or lower. When the cooling is completed in this way, the oil agent is subsequently applied by the oil agent applying device 7 disposed below the yarn cooling device 3.

  After that, through a market entanglement device (not shown) that interlaces the single fiber group constituting the multifilament yarn 2 as necessary, the first take-up roller 8 and the second take-up roller 9 at a predetermined spinning speed. It is taken up and finally wound up as a yarn package by the winder 10.

  The cylindrical cooling air blowing surface 6 provided inside the yarn cooling device 3 of the present invention configured as described above has a rectifying effect for blowing out the cooling air while rectifying the cooling air. It has a function as a rectifying structure made of a laminated plate or the like. Further, it goes without saying that it has a function as a means for equalizing the cooling air made of a known sintered porous body or porous plate.

  Therefore, the multifilament yarns 2 traveling inside thereof are effectively cooled by the cooling air blown radially from the cooling air blowing surface 6. It should be noted that the cooling process performed at this time exhibits extremely excellent operational effects as described below, as compared with a cooling method using a conventional horizontal blow type cooling device.

  That is, in the conventional melt spinning of the ultrafine multifilament yarn 2 composed of a single fiber group of 1.0 decitex or less, the fineness of the single fiber is small, so that the yarn is swayed by the cooling air pressure or the cooling air is blown. Careful attention had to be paid to the occurrence of cooling spots on the surface and anti-spray surface. In addition, even if such careful attention is paid, the fineness of the single fiber becomes smaller, and when the number of single fibers (filaments) constituting the yarn 2 becomes 100 or more, the cooling method has a limit. What has happened is as already mentioned.

  In contrast, in the yarn cooling device 3 according to the present invention in which the yarn 2 is allowed to pass through the inside of the cylindrical cooling air blowing surface 6 and is cooled, the yarn cooling device 3 according to the present invention has a one-to-one correspondence independently for each yarn for each spindle. The outer peripheral side of the yarn 2 from a position close to the yarn 2 spun from the base 1 by the cooling air blown radially from the entire circumferential surface of the corresponding cylindrical cooling air outlet surface 6. The cooling air can be applied so as to wrap each yarn 2 from the inner side to the inner peripheral side. For this reason, there is no generation of cooling spots on the air blowing surface side and the counter air blowing surface side of the cooling air as in the case of the horizontal air cooling method in which the cooling air is blown only from one direction.

  In addition, even if the cooling air is relatively weak without increasing the wind speed of the cooling air, the cooling air can easily flow between the single fiber groups, and extremely efficient cooling is possible. For this reason, even if the fineness of the single fiber is small, there is no occurrence of large yarn fluctuation cold as in the conventional case, so that the cooling spots can be more effectively suppressed. Therefore, the yarn cooling device 3 of the present invention is extremely suitable for melt spinning of the multifilament yarn 2 composed of a single fiber group of 0.1 filaments or less and 100 filaments or more.

  However, if the yarn cooling device 3 is designed exclusively for the melt spinning device for ultrafine fibers as described above, fibers of various brands must be spun in response to high added value and brand differentiation. It becomes difficult to respond to the very modern demand of not becoming. Therefore, the yarn cooling device 3 that can flexibly cope with the type and fineness of the brand to be melt-spun is required. Hereinafter, this major feature of the yarn cooling device 3 of the present invention will be described in detail with reference to FIG.

  In the yarn cooling device according to the present invention, with respect to the cooling capacity of the yarn 2, the yarn having the largest single fiber fineness, that is, the yarn 2 having the largest single fiber diameter is designed as a reference. Then, the yarn 2 having a smaller single fiber fineness can be dealt with by providing a cooling capacity adjusting member that can be easily and easily attached and detached.

  Specifically, as illustrated in FIG. 1, the bottom plate 12 is removed from the cylindrical cooling air blowing surface 6, and the cylindrical cooling length adjusting member 11 extends along the outer wall of the cooling air blowing surface 6 from the lower end. After the insertion, the bottom plate 12 is returned to its original position. As a result, the portion of the cooling air blowing surface 6 into which the cooling length adjusting member 11 is inserted is blocked, and the cooling air is no longer blown out.

  The above is an embodiment when the cylindrical cooling length adjusting member 11 is inserted and fitted along the outer wall of the cooling air blowing surface 6. However, the present invention is not limited to this embodiment, and the cooling length adjusting member 11 ′ may be inserted not along the outer wall of the cooling air blowing surface 6 but along the inner wall. In this case, since it is not necessary to remove the bottom plate 12, the cooling length can be adjusted more easily and easily.

  If it does so, since the blowing length of a cooling wind will become short by the distance L of the part which inserted the cooling length adjustment member 11, cooling capacity can be adjusted (cooling capacity can be reduced) by this short part L. It can be easily adapted to the cooling conditions of the yarn 2 having a thin single fiber diameter. Thus, the yarn cooling device 3 according to the present invention can easily and easily change the blowing length of the cooling air blowing surface 6 for each brand of yarn to be melt-spun, so that a more flexible production plan can be made. Can be done.

  As a result, it is possible to easily and flexibly cope with a single fiber diameter thin brand to a thick brand with a single yarn cooling device 3, thereby making it possible to adjust a plurality of brands just by finely adjusting one yarn cooling device 3. Production can be greatly contributed to improving production efficiency and reducing production costs. It is also flexible not only for melt spinning of fibers made of a single polymer, but also for multi-spindle composite yarns of multiple types of polymers, or for multiple yarns with different specifications such as single fiber fineness and number of filaments. Can respond.

It is a schematic diagram which shows an example of the cylindrical yarn cooling device of the synthetic fiber of this invention.

Explanation of symbols

1: base 2: multifilament yarn 3: yarn cooling device 4: seal structure 5: partition plate 6: cylindrical cooling air blowing surface 7: oil supply device 8: first take-up roller 9: second take-up roller 10 : Winding device 11, 11 ': Cooling length adjusting member 12: Bottom plate

Claims (1)

In order to discharge the molten thermoplastic polymer and spin it as multifilament and yarn, it is arranged below the spinneret having a group of spinning holes drilled on multiple concentric circles, and further runs inside it. In the yarn cooling device provided with a cylindrical cooling air blowing surface that blows out the cooling air for cooling the spun yarn radially from the outer peripheral side to the inner peripheral side of the yarn,
A cooling length adjusting member capable of adjusting the blowing length of the cooling air blown from the cooling air blowing surface is inserted from the lower end along the inner wall surface and / or outer wall surface of the cylindrical cooling air blowing surface, and the cooling length of the cooling air blowing surface is set. Yarn cooling device characterized by being adjustable.

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