JP2014065992A - Composite spinneret and method for manufacturing composite fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite spinneret that increases a number of composite fibers to be installed at one nozzle, increases an island number per the nozzle and can improve the ratio of the island and the polymer, and to provide a method for manufacturing a composite fiber that perform the melt spinning with a composite spinning machine using the composite spinneret.SOLUTION: A composite spinneret has one cross-section which area in a perpendicular direction against a direction of spinning out the polymer at an upper contracted flow hole is maximum and has a portion of a lower contracted flow hole in a region projected in the direction of spinning out the polymer.

Description

The present invention relates to a composite die for discharging a composite polymer stream composed of two or more kinds of polymers and a method for producing a composite fiber.

  Fibers using thermoplastic polymers such as polyester and polyamide are excellent in mechanical properties and dimensional stability, so their uses have diversified and many fibers with various functionalities have been developed.

  For example, in apparel applications, improvements such as polymer modification have been made for the purpose of imparting new functionality such as realization of dyeing with excellent sharpness. In industrial material applications, improvements such as higher polymer strength, higher elasticity, and modification of polymers aimed at imparting new functionality such as weather resistance and flame retardancy have been made. In addition to the above improvements, composite fibers that combine two or more polymers to complement performance that is insufficient with a single component polymer or that give a completely new function are being actively developed. ing.

  The composite fiber includes a core-sheath type, a side-by-side type, and a sea-island type fiber obtained by using a composite die, and an alloy type obtained by melt-kneading polymers. In the core-sheath type, the sheath component coats the core component, so that it is possible to impart sensibility effects such as texture and bulkiness that cannot be achieved with a single fiber, and mechanical properties such as strength, elastic modulus, and wear resistance. Become. Further, in the side-by-side type, it is possible to express crimpability, which is impossible with a single fiber, and to impart stretchability and the like.

  And in the sea-island type, by eluting the easily-eluting component (sea component) after melt spinning, only the difficult-to-elute component (island component) remains, and it is possible to obtain ultrafine fibers with a single fiber diameter of nano-order. It becomes possible.

  When it becomes such an extra fine fiber, in the use for clothing, a soft touch and fineness that cannot be obtained with ordinary fibers are expressed, and it can be applied to artificial leather, new touch textiles, etc., and the fiber spacing becomes dense. Therefore, it can be developed as a high-density woven fabric for sports clothing that requires windproof and water repellency. In industrial material applications, it can be applied to high-performance filters, etc., because the specific surface area is increased and dust collection is improved, and precision equipment is used by wiping off dirt by inserting ultrafine fibers into fine grooves. It can also be applied to wiping cloths, precision polishing cloths, and the like.

  In addition, generally the method of manufacturing a composite fiber with a composite nozzle | cap | die is called a composite spinning method, and the method of manufacturing by melt kneading of polymers is called a polymer alloy method. Although the polymer alloy method can be used to produce the ultrafine fibers as described above, the control of the fiber diameter is limited, and it is difficult to obtain uniform and homogeneous ultrafine fibers. On the other hand, the composite spinning method precisely controls the composite polymer flow with a composite die, and in particular, it can form a highly accurate yarn cross-sectional form uniformly and homogeneously in the running direction of the yarn, compared with the polymer alloy method. The superiority is considered high. As a matter of course, the composite die technique in this composite spinning method is extremely important for stably determining the cross-sectional shape of the yarn, and various proposals have been made conventionally.

  For example, Patent Document 1 discloses a composite base as shown in FIG. (A) of FIG. 5 is a schematic longitudinal cross-sectional view of the composite nozzle | cap | die of patent document 1, (b) is a schematic longitudinal cross-sectional view of the composite fiber obtained from the composite nozzle | cap | die of patent document 1. FIG. In the figure, 20 is the third plate, 21 is the third plate island component through hole, 22 is the third plate sea component through hole, 23 is the fourth plate, 24 is the fourth plate constriction hole, 25 is the fifth plate, 26 is a fifth plate island component through-hole, 27 is a fifth plate sea component through-hole, 28 is a sixth plate, 29 is a sixth plate constriction hole, 30 is a seventh plate, 31 is a seventh plate constriction hole, 32 is a supply hole, 33 is a sea component polymer, 34 is an island component polymer, and 35 is a sea component polymer or other component polymer.

  Hereinafter, in each drawing, when a member corresponding to the already-explained drawing exists, the description may be omitted by using the same reference numerals.

  In the composite base of Patent Document 1, from the third plate island component through hole 21 for discharging the island component polymer of the third plate 20 and the third plate sea component through hole 22 for discharging the sea component polymer. The discharged polymer of both components merges at the fourth plate constriction hole 24 of the fourth plate 23 to form a composite polymer flow, and then in the polymer spinning path direction of the fourth plate constriction hole 24. It contracts in a region where the cross-sectional area in the vertical direction decreases. Further, both components discharged from the fifth plate island component through-hole 26 for discharging the island component polymer and the fifth plate sea component through-hole 27 for discharging the sea component polymer of the fifth plate 25, respectively. Of the sixth plate 28 merge at the sixth plate constriction hole 29 to form a composite polymer flow, and then the cross-sectional area of the sixth plate constriction hole 29 in the direction perpendicular to the polymer spinning path direction is Shrink in the decreasing area. The plurality of composite polymer flows merge at the seventh plate contraction hole 31 of the seventh plate 30, and are surrounded and covered by the sea component supplied from the supply hole 32, and then the seventh plate contraction hole 31. A composite having a number of extremely fine island component polymers 34 in a sea component polymer 33 covered with a sea component polymer 35 by contracting in a region where the cross-sectional area in the direction perpendicular to the polymer spinning path direction decreases. It is described that fibers can be formed.

  However, in Patent Document 1, the flow path for forming one composite fiber is configured such that the plurality of sixth plate flow-reducing holes 29 are adjacent to each other in the direction perpendicular to the polymer spinning path direction. Since a wide flow path area is required throughout, a large number of composite fibers may not be manufactured. Further, according to the knowledge of the present inventors, the flow path for supplying the polymer of each component to the fifth plate island component through hole 26 and the fifth plate sea component through hole 27 is defined as the sixth plate constriction hole. Since it is necessary to provide 29 in the area | region outside the area | region projected in the polymer spinning path | route direction, said problem may become more remarkable.

  Further, according to the knowledge of the present inventors, in the seventh contracted hole 31, the composite polymer flow supplied from the sixth contracted hole 29 proceeds in the direction of the polymer spinning path, but is supplied from the supply hole 32. The sea component polymer flows in from the direction perpendicular to the direction of the polymer spinning path and merges with the composite polymer flow. Therefore, the interface between the sea component polymer and the island component polymer becomes unstable at the time of merging, and the resulting composite fiber In some cases, a uniform cross section may not be formed.

JP 2007-39858 A

  The object of the present invention is to increase the number of composite fibers per die, and by extension, increase the number of islands per die and improve the island polymer ratio (area ratio of island components in the cross section of one composite fiber). An object of the present invention is to provide a composite die that can be produced, and a composite fiber manufacturing method in which melt spinning is performed by a composite spinning machine using the composite die.

In order to achieve the above object, a composite base for discharging a composite polymer flow constituted by an island component polymer and a sea component polymer, which satisfies the requirements (1) to (4) A composite base is provided.
(1) The composite die has an upper distributor, an upper discharge plate, an upper flow reduction plate, a lower discharge plate, and a lower flow reduction plate that supply each polymer in order toward the downstream side in the polymer spinning path direction. Consists of.
(2) In the upper discharge plate, a plurality of upper sea discharge holes for discharging the sea component polymer supplied from the upper distribution device, a plurality of upper island discharge holes for discharging the island component polymer, or a composite polymer flow are discharged. A plurality of upper composite discharge holes, one or more upper sea supply holes for supplying the sea component polymer supplied from the upper distribution device, and one or more upper island supply holes for supplying the island component polymer. In the upper stage current contraction plate, an upper stage current reduction hole communicating with the upper stage sea discharge hole and the upper stage island discharge hole, or the upper stage composite discharge hole, and a sea introduction hole communicating with the upper stage sea supply hole, An island introduction hole communicating with the upper island supply hole is formed, and in the lower discharge plate, a lower supply hole communicating with the upper contraction hole, and a plurality of lower sea discharge holes communicating with the sea introduction hole, Connected to the island introduction hole A plurality of said lower composite discharge hole communicating a plurality of lower islands discharge holes, or with the sea introduction holes and the island introducing hole is formed,
In the lower-stage flow reducing plate, a lower-stage discharge hole communicating with the lower-stage supply hole, and a lower-stage flow-reduction hole communicating with the lower-stage sea discharge hole and the lower-stage island discharge hole or the lower-stage composite discharge hole are formed. Being.
(3) In the upper stage contracted hole and the lower stage contracted hole, the cross-sectional area in the direction perpendicular to the polymer spinning path direction is smaller at the most downstream position than the most upstream position in the polymer spinning path direction.
(4) A cross-section in which the area in the direction perpendicular to the polymer spinning path direction of the upper stage flow-reducing hole is maximized, or a circumscribed circle in which the area in the direction perpendicular to the polymer spinning path direction of the upper stage flow-down hole is maximized A part of the lower-stage constricted hole is present in a region projected in the polymer spinning path direction.

  Further, according to a preferred embodiment of the present invention, the upper stage island supply hole, the upper stage sea supply hole, the island introduction hole, and the sea introduction hole are within a region in which the lower stage contraction hole is projected in the polymer spinning path direction. In addition, there is provided a composite die that is present in a region excluding the region where the upper-stage constricted hole is formed.

Moreover, according to the preferable form of this invention, the composite nozzle | cap | die with which the hole filling density of the said upper stage island discharge hole and the said lower stage island discharge hole is 2.0 piece / mm < ² > or more is provided.

Moreover, according to the preferable form of this invention, the composite nozzle | cap | die which satisfies the requirements of (1)-(5) is provided.
(1) In a die discharge hole corresponding to the upper stage flow-reducing hole and the lower stage flow-reduction hole and communicating with each other, the cross-sectional area in the direction perpendicular to the polymer spinning path direction is Be smaller at the most downstream position than at the most upstream position.
(2) The mass flow rate of the polymer passing through the upper island discharge hole and the lower island discharge hole is the same, and the mass flow rate of the polymer passing through the upper sea discharge hole and the lower sea discharge hole are the same, or The mass flow rate of the polymer passing through the upper composite discharge hole and the lower composite discharge hole is the same.
(3) The upper sea discharge hole and the lower sea discharge hole have the same hole diameter, hole length, number of holes and hole arrangement, and the upper island discharge hole and the lower island discharge hole have the same diameter, hole length, and hole number. The hole arrangement, the hole length, the number of holes, and the hole arrangement of the upper composite discharge hole and the lower composite discharge hole are the same.
(4) The upper flow contraction hole and the lower flow contraction hole have the same contraction ratio.
(5) The shape in the area | region where the cross-sectional area of the direction perpendicular | vertical to the polymer spinning path | route direction of the said nozzle discharge hole becomes the minimum is the same.
Moreover, according to the preferable form of this invention, the manufacturing method of the composite fiber which performs melt spinning by the composite spinning machine using the said composite nozzle | cap | die is provided.

  In the present invention, the “polymer spinning path direction” means that the polymer of each component is transferred from the upper island discharge hole or the upper sea discharge hole arranged in the upper discharge plate or the upper composite discharge hole to the lower flow contracting plate. It refers to the main direction that flows to the arranged lower discharge holes.

  In the present invention, the “hole packing density” is an area obtained by projecting, in the polymer spinning path direction, a cross section in which the area in the direction perpendicular to the polymer spinning path direction of the upper stage shrinking hole and the lower stage shrinking hole is maximum. Is a value obtained by dividing the area of the circumscribed circle perpendicular to the polymer spinning path direction by the number of nozzle discharge holes. The larger the hole packing density, the more the composite fiber is composed of a larger number of island components.

  In the present invention, the “reduced flow ratio” means the cross-sectional area in the direction perpendicular to the polymer spinning path direction at the most upstream position in the polymer spinning path direction in the region where the cross-sectional area changes in the polymer spinning path direction. The value obtained by dividing by the cross-sectional area in the direction perpendicular to the polymer spinning path direction at the most downstream position in the polymer spinning path direction.

  In the present invention, “the same hole arrangement” means that the figure obtained by projecting in the polymer spinning path direction of the upper island discharge hole and the upper sea discharge hole, and the polymer of the lower island discharge hole and the lower sea discharge hole The figure obtained by projecting in the spinning path direction is congruent, or the figure obtained by projecting in the polymer spinning path direction of the upper composite discharge hole and the lower composite discharge hole is congruent. That means. However, the distance between the upper island discharge hole and the upper sea discharge hole and the distance between the lower island discharge hole and the lower sea discharge hole include errors of ± 10% as well as complete congruence. .

  The “same” in the present invention refers to one that includes an error of ± 10%. Specifically, in the hole diameter and hole length, the length includes an error of ± 10%, in the number of holes, the number includes an error of ± 10%, and in the contraction ratio, The ratio includes an error of ± 10%, the mass flow rate includes an error of ± 10 wt%, and the positional relationship between the discharge holes includes an error of an inter-hole distance of ± 10 wt%. Say.

  According to the composite die of the present invention, one of the lower flow-reducing holes is located within a region projected in the direction of the polymer spinning path in the region where the area of the upper flow-reducing hole in the direction perpendicular to the polymer spinning path direction is maximum. With the configuration where the part exists, the base discharge holes can be arranged at high density, the number of composite fibers can be increased, and the number of islands per composite base can be increased, and the island polymer ratio can be improved. Become.

It is a schematic longitudinal cross-sectional view of the periphery of the composite nozzle | cap | die used for embodiment of this invention, a spinning pack, and a cooling device. FIG. 2 is a schematic top view of the composite base used in the embodiment of the present invention, and is a view taken along the line A-A ′ of FIG. 1. FIG. 2 is a partially enlarged longitudinal sectional view of a composite base used in an embodiment of the present invention, and is a C-C ′ sectional view of FIG. 1. It is the elements on larger scale of the composite nozzle | cap | die used for another embodiment of this invention seen from the same cross section as C-C 'of FIG. It is a schematic longitudinal cross-sectional view of the composite nozzle | cap | die of a prior art example. It is a schematic sectional drawing of the composite fiber manufactured with the composite nozzle | cap | die of the prior art example. It is the elements on larger scale of the composite nozzle | cap | die used for another embodiment of this invention seen from the same cross section as C-C 'of FIG. FIG. 2 is a partial schematic longitudinal sectional view of a commonly used composite base that is not an embodiment of the present invention.

  Hereinafter, embodiments of the composite base of the present invention will be described in detail with reference to the drawings. 1 is a schematic longitudinal sectional view of the periphery of a composite base, a spinning pack, and a cooling device used in an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA ′ of FIG. 1, and FIG. FIG. 4 is a partially enlarged longitudinal sectional view of CC ′ of FIG. 2, and FIGS. 4 and 6 are partially enlarged longitudinal sectional views of the composite base used in another embodiment of the present invention as seen from the same section as CC ′ of FIG. FIG. In FIG. 2, the value obtained by dividing the area of the circle indicated by the dotted line by the number of the nozzle discharge holes is the hole filling density. These are conceptual diagrams for accurately transmitting the essential points of the present invention, which are simplified, and the composite base of the present invention is not particularly limited, and the number of holes and the size ratio thereof are not limited to those of the embodiment. It can be changed according to the form.

  First, the principle that can increase the number of composite fibers per composite base, which is the most important point of the present invention, will be described. First, in order to clarify the difference between the prior art and the present invention, the arrangement of the constricted holes in the composite base of a general embodiment will be described with reference to FIG.

  As shown in FIG. 7, the general composite base 17 is configured by laminating a lower-stage distributor 410, a lower-stage discharge plate 3, and a lower-stage flow-contracting plate 4 in order in the polymer spinning path direction. In 410, a distribution channel 45 that distributes the polymer of each component to a plurality of channels is formed. In the lower discharge plate 3, a lower sea discharge hole 14 and a lower island discharge hole 13 are formed in communication with the distribution channel 45. Further, in the lower-stage contraction plate 4, a lower-stage contraction hole 16 is formed in communication with the lower-stage sea discharge hole 14 and the lower-stage island discharge hole 13, and finally communicates with the base discharge hole 18. Each polymer supplied to the lower distribution device 410 is distributed by the distribution flow path 45, and after the sea component polymer is introduced into the lower sea discharge hole 14 and the island component polymer is introduced into the lower island discharge hole 13, the lower stage contraction is performed. It merges in the flow hole 16 and becomes a composite polymer flow, which is discharged from the nozzle discharge hole 18 to form a composite fiber.

  Here, the number of composite fibers obtained from one composite base becomes the number of base discharge holes 18, and the same number of lower-stage flow-reducing holes 16 are required. The size, arrangement, and shape of the contracted hole 16 are restricted. For example, in order to increase the number of the composite fibers, the diameter and arrangement of the lower flow-reducing holes 16 are devised, and the lower flow-reducing holes 16 are arranged close to the processing limit, but there is a limit. In addition, by arranging a large number of lower island discharge holes 13 for supplying island component polymer, which are connected to the upstream side of the lower contracted flow holes 4, the number of island components in one composite fiber is increased. Although it is possible to increase the number of islands per mouthpiece (multiple islands), as described above, there is a limit to the increase in the number of islands if restricted by the number of lower-stage constricted holes 16. Thus, as a result of intensive studies on the above-mentioned problems, which were not considered in the conventional technique, the present inventors have found a new technique of the present invention.

  That is, as shown in FIG. 3, the composite base of the present invention is a combination of an upper distribution device 409 for supplying each polymer, an upper discharge plate 1 and an upper flow contracting plate 2 in the polymer spinning path direction. The lower distribution device 410, the lower discharge plate 3, and the lower flow contracting plate 4 are sequentially stacked as one combination on the downstream side in the polymer spinning path direction.

  Each flow path (the lower sea discharge hole 14, the lower island discharge hole 13, and the lower stage current reduction hole 16) formed in the lower discharge plate 3 and the lower flow reduction plate 4 has the same role as the above-described general composite base. Moreover, the upper stage discharge plate 1 and the upper stage flow contraction plate 2 are formed with an upper stage sea discharge hole 6, a lower stage island discharge hole 5, and an upper stage current reduction hole 9, and the lower stage sea discharge hole 14 and the upper stage sea flow are formed. The discharge hole 6, the lower island discharge hole 13 and the upper island discharge hole 5, and the lower stage flow reduction hole 16 and the upper stage flow reduction hole 9 have the same role. Therefore, in the lower flow contracting plate 4, the composite polymer flow is discharged from the cap discharge hole 18 through the lower flow contracting hole 16, and the sea component polymer discharged from the upper sea discharge hole 6 and the upper island discharge hole 5 are discharged. The resulting island component polymer joins at the upper contraction hole 9 to form a composite polymer flow. This composite polymer flow is guided to the lower supply hole 12 communicating with the downstream side, and further to the lower discharge hole 15 communicating with the downstream side, and finally discharged from the base discharge hole 18.

  Here, in order to supply the sea component polymer to the lower sea discharge hole 14 of the lower discharge plate 3, an upper sea supply hole 8 is formed in the upper discharge plate 1, and communicates therewith. The upper sea introduction hole 11 is formed. Further, in order to supply the island component polymer to the lower island discharge hole 13 of the lower discharge plate 3, an upper island supply hole 7 is formed in the upper discharge plate 1 and communicated therewith. An upper island introduction hole 10 is formed. Further, the upper distribution device 409 is provided with a distribution flow channel 45 for supplying each polymer to the flow channel of the upper discharge plate 1. Further, a lower distribution device 410 may be provided between the upper flow contraction plate 2 and the lower flow contraction plate 4, and in this case, the upper sea introduction hole 11, the lower sea discharge hole 14, and the upper island introduction hole. 10 and the lower sea discharge hole 13, and the upper stage contraction hole 9 and the lower stage supply hole 12 are connected.

  Therefore, the upper flow-reducing hole 9 of the composite die of the present invention has at least a region in which the cross-sectional area decreases along the polymer spinning path direction, and is adjacent to the downstream in the polymer spinning path direction. Since the distance in the direction perpendicular to the polymer spinning path direction increases between the matching upper stage flow-reducing holes 9, a space where no flow path exists is provided. The present inventors have conceived that a new flow path can be formed in this space, and have found the composite base of the present invention.

  In the conventional composite base, the composite fiber is formed by a combination of a flow path including one distribution device, a discharge plate, and a contraction plate. However, the upper distribution device 409 and the upper discharge plate 1 are arranged in the upper stage. The number of the constricted holes is obtained by adopting a multi-stage configuration of the upper-stage contracted plate 2 and the lower-stage distributor 410, the lower-stage discharge plate 3, and the lower-stage contracted plate 4 arranged downstream in the polymer spinning path direction. In order to increase the number of composite fibers, and thus the number of island components. However, what is important is that the flow for supplying each component polymer to the lower-stage contracted holes 16 is simple even if the lower-stage contracted holes 16 having the same number of holes, hole diameter, and hole arrangement as the upper-stage contracted holes 9 are arranged. Since the space for the road (upper sea supply hole 8, upper island supply hole 7, and upper sea introduction hole 11 and upper island introduction hole 10) is required, the effect of increasing the number of contracted holes is extremely high. Get smaller.

  Therefore, the upper-stage constricted hole 9 of the present invention is formed in a throttle shape having a small cross-sectional area on the downstream side in the polymer spinning path direction to form a region where the lower-stage constricted hole 16 can be disposed. In other words, a part of the upper flow-reducing hole 9 exists in a region where a cross section in which the area in the direction perpendicular to the polymer spinning path direction of the lower flow-restricted hole 16 is maximum is projected. And in order to supply each component polymer to the lower stage flow-reducing hole 16, the diameter of the flow path of the upper stage sea introduction hole 10 and the upper stage island introduction hole 11 is reduced within a range in which the flow path pressure loss does not increase. Further, in order to guide the composite polymer flow obtained at the upper stage contraction hole 9 to the base discharge hole 18 at the shortest, the lower stage supply hole 12 and the lower stage discharge hole are provided in a region where the lower stage contraction hole 16 is not provided. 15 is formed.

  When this is seen in the top view of the composite base, as shown in FIG. 2, the upper stage contraction hole 9 and the lower stage contraction hole 16 are arranged so as to overlap each other. It becomes the form where a supply hole is arranged, respectively. Further, the die discharge hole 18 of the present invention has a narrowed portion where the cross section in the polymer spinning path direction finally decreases (on the final lower surface, it has a straight portion whose cross-sectional area does not change), Thereby, the measurement property of the composite polymer discharged from the composite die is ensured and the cross-section uniformity of the composite fiber is obtained. However, the supply holes of the composite polymer up to that point, particularly the lower supply holes 12 and the lower discharge holes. 15, it is preferable to increase the channel cross-sectional area to such an extent that the channel pressure loss does not increase.

  As a result, the composite die of the present invention can increase the number of contracted holes (upper-stage contracted holes 9 and lower-stage contracted holes 16) per composite base, and in turn pulls a larger number of composite fibers. However, the number of islands per base can be increased. Along with this, the ratio of island component polymers forming one composite fiber also increases. Further, since the upper island discharge hole 5 and the upper sea discharge hole 6 of the upper discharge plate 1 can be arranged at any position of the upper flow contraction hole 9, the upper island discharge hole 5 is polymer-spun of the upper flow contraction hole 9. By disposing the entire area projected in the path direction, the distance between the adjacent island discharge holes can be increased, and the sea discharge holes can be disposed between them, so that the interval between the island component polymers of the obtained composite fiber is increased. . Therefore, the eluate easily enters between the island component polymers during the elution treatment of the sea component polymer, and the elution treatment becomes easy. Similarly, for the lower island discharge holes 13 and the lower sea discharge holes 14 of the lower discharge plate 3, the number of islands and the island component polymer ratio can be improved. Next, the case where the distribution and supply of each component polymer in the upper distribution device 409 and the lower distribution device 410 is a distribution type will be described with reference to FIG.

  The upper distribution device 409 and the lower distribution device 410 are configured by laminating a plurality of thick plates called distribution plates and thin plates called distribution plates, and these measurement plates and distribution plates are combined with a composite base by positioning pins. Positioning may be performed so that the center position (core) of 17 is aligned, and fixing may be performed with screws, bolts, or the like, or metal bonding (diffusion bonding) may be performed by thermocompression bonding. Here, the distribution plate is provided with a channel groove and a channel hole for distributing the island component polymer and the sea component polymer, respectively. By giving, it has a role which supplies a polymer uniformly to the inflow channel of the distribution plate located in the uppermost part. In addition, a distribution hole 402 and / or a distribution groove 401 for distributing the island component polymer and the sea component polymer are formed in one distribution plate, and the distribution groove 401 is perpendicular to the direction of the polymer spinning path. The distribution holes 402 have a role of guiding the polymer in the direction of the polymer spinning path. A distribution plate having distribution holes and a distribution plate having distribution grooves are alternately stacked to form one distribution groove communicating with the downstream position in the polymer spinning path direction for one distribution hole. In addition, by forming a tournament type flow path that constitutes a plurality of distribution holes communicating with the end of the distribution groove, the polymer of each component distributed by the measuring plate can be further divided into finer polymers. Can do. The upper distributor 409 is formed with an upper island supply hole 7 and an upper sea supply hole 8 for supplying each component polymer to the lower contracted flow hole 16 penetrating in the polymer spinning path direction. In 410, a lower supply hole 12 for supplying the composite polymer of the upper contracted flow hole 9 is formed penetrating in the polymer spinning path direction.

  Therefore, the divided island component polymer flows into the upper island discharge hole 5 in the upper discharge plate 1 and flows into the lower island discharge hole 13 in the lower discharge plate 3, and the sea component polymer flows into the upper discharge plate 1. Flows into the upper sea discharge hole 6, and in the lower discharge plate 3, flows into the lower sea discharge hole 14, and after being discharged, it merges at the upper flow contraction hole 9 or the lower flow contraction hole 16, and the composite polymer flow is Form.

  This composite polymer flow stabilizes the interface between the two component polymers in a region where the cross-section in the direction perpendicular to the polymer spinning path direction does not change, and subsequently the cross-sectional area in the direction perpendicular to the polymer spinning path direction decreases. In the area where Next, the case where the distribution and supply of each component polymer in the upper distribution device 409 and the lower distribution device 410 is a pipe type will be described with reference to FIG.

  The upper distribution device 409 and the lower distribution device 410 are formed with an island introduction pipe 207 supplied with an island component polymer, a sea supply hole 205 for supplying a sea component polymer, and a distribution chamber 206 communicating with the sea supply hole 205. . Here, the island introduction pipe 207 of the upper distribution device 409 corresponds to the upper composite discharge hole 208 on a one-to-one basis, and communicates with the upper composite discharge hole 208 together with the distribution chamber 206, and the island introduction pipe of the lower distribution device 410. 207 corresponds to the lower composite discharge hole 215 on a one-to-one basis, and communicates with the lower composite discharge hole 215 together with the distribution chamber 206. The upper distributor 409 is formed with an upper island supply hole 7 and an upper sea supply hole 8 for supplying each component polymer to the lower contracted flow hole 16 penetrating in the polymer spinning path direction. In 410, a lower supply hole 12 for introducing the composite polymer of the upper contracted flow hole 9 is formed penetrating in the polymer spinning path direction.

  Here, the island component polymer discharged from the island introduction pipe 207 and the sea component polymer supplied from the distribution chamber 206 merge at the upper composite discharge hole 208 or the lower composite discharge hole 215 to form the sea component polymer. A core-sheath composite polymer flow is formed so as to be wrapped, and is discharged into the upper stage contraction hole 9 or the lower stage contraction hole 16. This composite polymer stream is stabilized and contracted at the interface in the same manner as in the distribution type system.

  In addition, according to a preferred embodiment of the present invention, as shown in FIG. 6, the region where the lower flow-reducing holes 16 are projected in the direction of the polymer spinning path and the region where the upper flow-reduced holes 9 are formed are excluded. The upper island supply hole 7, the upper sea supply hole 8, the upper island introduction hole 10, and the upper sea introduction hole 11 are preferably arranged in the region.

  As a result, the flow path for supplying each polymer to the lower contracted hole 16 can be included in a region where the cross section of the uppermost flow position in the polymer spinning path direction of the lower contracted hole 16 is projected. In the flow plate 2 and the lower stage flow plate 4, it becomes possible to arrange many upper stage flow holes 9 and lower stage flow holes 16, and the number of composite fibers per composite base can be further increased.

Moreover, in both the distribution type base and the pipe type base, the island component polymer and the sea component polymer join together while proceeding in the direction of the polymer spinning path, so that the interface is stably formed, and the resulting composite fiber The island component can form a uniform cross section. Moreover, in this invention, it is preferable that a hole filling density is 2.0 piece / mm < ² > or more. If the hole filling density is 2.0 holes / mm ² or more, the difference from the conventional composite die technology becomes clearer. In the range examined by the present inventors, the hole packing density could be carried out as long as the range was 2.0 to 20.0 / mm ² . From the viewpoint of the hole filling density, the range in which the superiority of the composite die of the present invention is obtained is preferably 2.0 to 20.0 / mm ² . When the hole packing density is 2.0 / mm ² or more, a multifilament in which the fiber diameter of one island component is 500 nm class can be obtained. In addition, when the hole packing density is 20.0 pieces / mm ² or more, it is possible to form a super multifilament having a fiber diameter of 300 nm or less. The base production cost becomes enormous. In addition, since the flow path length becomes long and the flow path pressure loss increases, in this case, the types of polymers that can be applied may be limited.

  According to a preferred embodiment of the present invention, the mass flow rate of each component polymer supplied to the upper stage contraction hole 9 and the lower stage contraction hole 16 is the same, and the upper stage sea discharge hole 6 and the lower stage sea discharge hole are provided. 14 and the upper island discharge hole 5 and the lower island discharge hole 13 or the upper composite discharge hole 208 and the lower composite discharge hole 215 have the same hole diameter, hole length, number of holes, and hole arrangement, respectively. And the lower flow-reducing hole 16 have the same flow reduction ratio, and the shape of the nozzle discharge hole 18 in the region where the cross-sectional area in the direction perpendicular to the polymer spinning path direction is the same is the same. It is possible to equalize all the channel pressure losses from the upstream channel hole to the nozzle discharge hole 18 disposed in the lower flow contracting plate 4. As a result, it is possible to improve the uniformity of the cross section of the composite fiber discharged from the composite die. Here, the flow path pressure loss occurs over the entire length of the flow path until the polymer is supplied from the extruder and discharged from the nozzle discharge hole 18, but on the downstream side in the polymer spinning path direction from the upper discharge plate 1. Since the generated channel pressure loss is dominant, the channel pressure loss from the upper discharge plate 1 to the lower contracted flow plate 4 may be made equal.

  Further, each discharge hole (the positional relationship between the upper island discharge hole 5 and the upper sea discharge hole 6, the lower island discharge hole 13 and the lower sea discharge hole 14) communicated with the upper contraction hole 9 and the lower contraction hole 16. By making the same, the arrangement of the island component polymers in the composite fiber can be made equal.

  Next, each member and the shape of each member common to the composite base 17 of the embodiment of the present invention shown in FIGS. 1, 2, 3, 4, and 6 will be described in detail.

  Each flow path hole for discharging the polymer of each component of the present invention may be circular, polygonal, star-shaped, etc., and the cross section may be changed along the polymer spinning path direction. It can be changed according to the form. In particular, the upper discharge plate 1, the upper flow reduction plate 2, the lower discharge plate 3, the lower flow reduction plate 4, the upper island discharge hole 5, the upper sea discharge hole 6, the upper island supply hole 7, the upper sea supply hole 8, and the upper island. Introduction hole 10, Upper sea introduction hole 11, Lower stage supply hole 12, Lower stage island discharge hole 13, Lower stage sea discharge hole 14, Lower stage discharge hole 15, Composite base 17, Sea supply hole 205, Distribution chamber 206, Island introduction pipe 207, The upper composite discharge hole 208, the lower composite discharge hole 215, the distribution groove 401, the distribution hole 402, the upper distribution device 409, the lower distribution device 410, the base discharge hole 18, the upper contraction hole 9, and the lower contraction hole 16 are polymers. An arbitrary cross section in a direction perpendicular to the spinning path direction is preferably circular from the viewpoint of polymer meterability, but is not limited thereto. In addition, the arrangement of the upper stage flow-reducing holes 9 and the lower stage flow-reduction holes 16 of the present invention is such that a plurality of upper stage flow-reduction holes 9 and lower stage flow-reduction holes 16 have a plurality of PCDs (pitch circles) having the same center as the composite base 17. A plurality of rows of annular arrangements arranged along the diameter) are desirable, but a lattice arrangement or a staggered arrangement may be used, and any arrangement may be used. What is important here is to provide as many upper-stage contracted holes 9 and lower-stage contracted holes 16 as possible in order to increase the number of conjugate fibers per die.

  Further, as the positional relationship between the upper island discharge hole 5 and the upper sea discharge hole 6 in the upper discharge plate 1 of the present invention, the upper island discharge hole 5 is arranged at the center of gravity of the regular polygon, and the upper sea discharge hole is at the apex position. 6 is preferably disposed, but the upper island discharge hole 5 may be disposed inside a polygon or star shape, and the upper sea discharge hole 6 may be disposed at the apex position. Similarly, as the positional relationship between the lower island discharge hole 13 and the lower sea discharge hole 14 in the lower discharge plate 3 of the present invention, the lower island discharge hole 13 is arranged at the center of gravity of the regular polygon, and the lower sea discharge is at the apex position. Although it is preferable to arrange the holes 14, the lower island discharge holes 13 may be arranged inside a polygon or star shape, and the lower sea discharge holes 14 may be arranged at the apex position. What is important here is that the upper island discharge holes 5 and the upper sea discharge holes 6 and the lower island discharge holes 13 and the lower sea discharge holes 14 are arranged so that the island component polymers do not merge with each other.

  Further, the upper distribution device 409, the upper discharge plate 1, the upper flow contracting plate 2, the lower distribution device 410, the lower discharge plate 3, and the lower flow contracting plate 4 may not be adjacent to the polymer spinning path direction. One or more plates provided with through holes communicating with adjacent flow paths may be provided.

  Further, the upper discharge plate 1 and the lower discharge plate 3 of the present invention may have different shapes in the direction perpendicular to the polymer spinning path direction from the shapes perpendicular to the polymer spinning path direction of the composite die 17. In addition, the cross-sectional area in the direction perpendicular to the polymer spinning path direction is smaller than the cross-sectional area in the direction perpendicular to the polymer spinning path direction of the composite die 17 so that the upper discharge plate 1 or lower discharge having a small cross-sectional area is obtained. A concave portion having the same shape as the plate 3 may be formed in a plate adjacent to the polymer spinning path direction, and the small upper discharge plate 1 or the lower discharge plate 3 may be embedded in the concave portion. It can be changed.

  In the embodiment of the present invention, the sea component polymer or the island component polymer may be two or more components, and can be changed according to the embodiment.

  In addition, the flow received by the polymer of each component supplied to the upper flow-reducing hole 9 from the channel hole at the most upstream position of the upper-stage discharge plate 1 to the nozzle discharge hole 18 provided in the lower-stage flow reduction plate 4. When the difference between the channel pressure loss and the polymer of each component supplied to the lower flow contracting hole 16 is large, the area where the cross-sectional area in the direction perpendicular to the polymer spinning path direction is minimum in the nozzle discharge hole 18 By reducing the cross-sectional area in the vertical direction or increasing the length in the polymer spinning path direction and increasing the flow path pressure loss in the nozzle discharge hole 18, the pressure loss in each polymer spinning path is made equal. May be.

  Moreover, the upper stage flow-reducing hole 9, the lower stage flow-reduction hole 16, and the nozzle discharge hole 18 have a throttle shape in which a cross-sectional area decreases in a part in the polymer spinning path direction toward the downstream side in the polymer spinning path direction ( (Constriction part) may be sufficient, and the constriction part may be provided at a plurality of locations discontinuously along the polymer spinning path direction.

Hereinafter, the effects of the composite base 17 of the embodiment of the present invention will be specifically described with reference to examples.
(1) Precipitation of the island component of the composite fiber In order to deposit the island component from the composite fiber, the composite fiber is immersed and removed in a solution or the like in which the sea component of the easily eluted component can be dissolved. A multifilament was obtained. When the easily eluting component was copolymerized PET or polylactic acid (PLA) in which 5-sodium sulfoisophthalic acid or the like was copolymerized, an alkaline aqueous solution such as an aqueous sodium hydroxide solution was used. Further, when the aqueous alkali solution is heated to 50 ° C. or higher, the progress of hydrolysis can be accelerated, and if it is processed using a fluid dyeing machine or the like, it can be processed in a large amount at a time.
(2) Fiber diameter of multifilament The obtained multifilament made of ultrafine fibers was embedded with epoxy resin, frozen with Reichert's FC-4E cryosectioning system, and Reichert-Nissei ultracut N equipped with a diamond knife ( After cutting with an ultramicrotome, the cut surface was photographed with a VE-7800 scanning electron microscope (SEM) manufactured by Keyence Corporation at a magnification of 5000 times. Randomly selected 150 ultrafine fibers were extracted from the obtained photographs, and all circumscribed circle diameters (fiber diameters) were measured for the photographs using image processing software (WINROOF) to obtain an average fiber diameter.
(3) Fineness The composite fiber is round knitted and immersed in a 3% by weight aqueous solution of sodium hydroxide (80 ° C. bath ratio 1: 100) to dissolve and remove 99% or more of the easily soluble components, and then unraveled by unraveling the knitting. A multifilament made of fibers was extracted, the weight of 1 m was measured, and the fineness was calculated by multiplying by 10,000. This was repeated 10 times, and the value obtained by rounding off the second decimal place of the simple average value was defined as the fineness.
(4) Polymer melt viscosity The chip-like polymer was adjusted to a moisture content of 200 ppm or less by using a vacuum dryer, and the melt speed was measured stepwise by "Capillograph 1B" manufactured by Toyo Seiki Co., Ltd. The measurement temperature is the same as the spinning temperature, and the melt viscosity of 1216 s ⁻¹ is described in the examples or comparative examples. By the way, it took 5 minutes from putting the sample into the heating furnace to starting the measurement, and the measurement was performed in a nitrogen atmosphere.
(5) Intrinsic viscosity [η]
Measurement was performed at 25 ° C. using orthochlorophenol as a solvent.
[Example 1]
Polyethylene terephthalate (PET melt viscosity: 120 Pa · s) with an intrinsic viscosity (IV) of 0.63 dl / g as an island component, and 5.0 mol% of 5-sodium sulfoisophthalic acid with an IV of 0.58 dl / g as a sea component polymer Copolymerized PET (copolymerized PET melt viscosity: 140 Pa · s) is melted separately at 290 ° C., weighed, and flowed into a spin pack incorporating the composite die of this embodiment shown in FIG. A sea-island composite polymer stream was discharged from the hole. The sea-island ratio is 30/70, and the discharged composite polymer stream is cooled and solidified and then applied with oil, wound at a spinning speed of 1500 m / min, and unstretched with 180 dtex-18 filaments (single hole discharge rate 2.25 g / min) Fiber was collected. The wound unstretched fiber is stretched 3.0 times between rollers heated to 90 ° C. and 130 ° C. to form a composite fiber of 60 dtex-18 filaments, and 99% or more of sea components are dissolved by the method described above, 6400 A multifilament was collected.

  Here, for the composite base 17 used in Example 1, a distribution-type base as shown in FIG. 2 is used, and the PCD having a diameter of 106 mm and the six lower constriction holes 16 and the phase angle α = 42 degrees. Six lower discharge holes 15 are formed on a PCD having a diameter of 54 mm and three lower discharge holes 16 on a PCD having a diameter of 54 mm, and three lower discharge holes 15 are formed on a PCD having a diameter of 113 mm. Six upper island introduction holes 10 at 17 degrees, a phase angle α = 32 degrees on a PCD with a diameter of 61 mm, and six upper island introduction holes 11 with a phase angle α = 18 degrees on a PCD with a diameter of 98 mm The three upper sea introduction holes 10 were arranged at equal intervals on a PCD having a diameter of 45 mm with a phase angle α = 36 degrees. The upper-stage contracted holes 9 and the lower-stage contracted holes 16 have a cross section in the direction perpendicular to the polymer spinning path direction at the most upstream position in the polymer spinning path direction and a diameter of 24 mm, at the most downstream position in the polymer spinning path direction, The cross section in the direction perpendicular to the polymer spinning path direction is 4 mm in diameter, and the cross section in the direction perpendicular to the polymer spinning path direction of the upper sea introduction hole 10, the upper island introduction hole 11, and the lower discharge hole 15 is 4 mm in diameter. The cross section in the direction perpendicular to the polymer spinning path direction at the most downstream position in the polymer spinning path direction of the nozzle discharge hole has a diameter of 0.2 mm and communicates with one upper-stage reduced flow hole 9 or lower-stage reduced flow hole 16. 400 island discharge holes 5 or lower island discharge holes 13 were used.

As shown in Table 1, the hole filling density at this time was 0.5 / mm ² , and the thread diameter of the island component single fibers was 1000 nm.
[Example 2]
In the composite base used in Example 2, 10 lower flow-reducing holes 16 on a PCD having a diameter of 106 mm and 10 lower discharge holes 15 having a phase angle α = 18 degrees and 5 on a PCD having a diameter of 54 mm are provided. 5 lower discharge holes 15 with a lower flow constriction hole 16 and a phase angle α = 36 degrees, 6 upper island introduction holes 10 on a 114 mm diameter PCD, and 6 upper islands on a 61 mm diameter PCD. The introduction holes 11 are arranged at three equal intervals on the three upper sea introduction holes 11 on the PCD having a diameter of 98 mm, and the three upper sea introduction holes 11 on the PCD having a diameter of 46 mm. The unstretched fiber of 300 dtex-30 filament (single hole discharge amount 2.25 g / min) was collected by spinning with the same polymer, sea-island ratio, equivalent fineness, spinning conditions, and apparatus configuration. The wound unstretched fiber is stretched 3.0 times between rollers heated to 90 ° C. and 130 ° C. to obtain a composite fiber of 100 dtex-30 filament, and 99% or more of sea components are dissolved by the method described above, and 10600 A multifilament was collected. As shown in Table 1, the hole filling density at this time was 0.8 pieces / mm ² , and the yarn diameter of the island component single fibers was 800 nm.
[Example 3]
The number of the upper island discharge holes 5 or the lower island discharge holes 13 communicating with one upper stage flow-reducing hole 9 or lower stage flow-reduction hole 16 is 1500, and other than that, the same polymer, sea-island ratio, and same fineness as in Example 1, Spinning was performed under spinning conditions and apparatus configuration to obtain the same composite fiber as in Example 1, and 99% or more of sea components were dissolved by the method described above, and 26000 multifilaments were collected.

As shown in Table 1, the hole packing density at this time was 2.0 / mm ² , and the diameter of the island component single fibers was 500 nm.
[Comparative Example 1]
A total of ten upper flow-reducing holes 9 and lower flow-reduction holes 16 are formed on a PCD having a diameter of 106 mm, five upper flow-reducing holes 9 are formed on a PCD having a diameter of 54 mm, and a phase angle α = 17 on the PCD having a diameter of 114 mm. A total of five upper-stage constricted holes 9 and lower-stage constricted holes 16 are arranged on the PCD having a diameter of 61 mm, and five upper island introduction holes 10 are formed on the PCD having a diameter of 98 degrees. 10 upper sea introduction holes 11 at α = 18 degrees and 10 upper sea introduction holes 11 at a phase angle α = 36 degrees are arranged at equal intervals on a PCD having a diameter of 46 mm. An unstretched fiber of 150 dtex-15 filament (single hole discharge rate 2.25 g / min) was collected by spinning with a polymer equivalent to 1, sea-island ratio, equivalent fineness, spinning conditions, and apparatus configuration. The wound unstretched fiber is stretched 3.0 times between rollers heated to 90 ° C. and 130 ° C. to obtain a composite fiber of 50 dtex-15 filaments, and 99% or more of sea components are dissolved by the above-described method. A multifilament was collected. As shown in Table 1, the hole packing density at this time was 0.4 / mm ² , and the diameter of the island component single fiber was 1000 nm.

  As shown in Table 1, compared to Comparative Example 1, Example 1 had more composite fibers and a larger number of islands. In Example 2, the number and number of composite fibers obtained were further increased. In Example 3, the number and number of island component single fibers obtained were further increased, and the diameter of the island component single fibers was also reduced.

  Further, even when the island polymer ratio was as high as 70%, the island component polymer did not merge and stable spinning was possible.

  The present invention is not limited to a composite die used for a general solution spinning method, but can be applied to a melt blow method and a spun bond method, and also to a die used for a wet spinning method and a dry and wet spinning method. However, the application range is not limited to these.

DESCRIPTION OF SYMBOLS 1 Upper stage discharge plate 2 Upper stage current reduction plate 3 Lower stage discharge plate 4 Lower stage current reduction plate 5 Upper stage island discharge hole 6 Upper stage sea discharge hole 7 Upper stage island supply hole 8 Upper stage sea supply hole 9 Upper stage current reduction hole 10 Upper stage island introduction hole 11 Upper stage Sea introduction hole 12 Lower stage supply hole 13 Lower stage island discharge hole 14 Lower stage sea discharge hole 15 Lower stage discharge hole 16 Lower stage contraction hole 17 Composite base 18 Base discharge hole 20 Third plate 21 Third plate island component through hole 22 Third plate sea Component through hole 23 Fourth plate 24 Fourth plate contracted hole 25 Fifth plate 26 Fifth plate island component through hole 27 Fifth plate sea component through hole 28 Sixth plate 29 Sixth plate contracted hole 30 Seventh plate 31 Seventh plate contraction hole 32 Supply hole 33 Sea component polymer 34 Island component polymer 35 Sea component polymer or other component polymer 45 Distribution channel 205 Sea supply hole 206 Distribution chamber 207 Island Input pipe 208 upper composite discharge holes 215 lower composite discharge hole 401 distribution grooves 402 distribution holes 409 upper distributor 410 lower distributor 415 spin pack 416 spin block 417 cooling system α phase angle

Claims (5)

A composite die for discharging a composite polymer flow constituted by an island component polymer and a sea component polymer, which satisfies the requirements (1) to (4).
(1) The composite die has an upper distributor, an upper discharge plate, an upper flow reduction plate, a lower discharge plate, and a lower flow reduction plate that supply each polymer in order toward the downstream side in the polymer spinning path direction. Consists of.
(2) In the upper discharge plate, a plurality of upper sea discharge holes for discharging the sea component polymer supplied from the upper distribution device, a plurality of upper island discharge holes for discharging the island component polymer, or a composite polymer flow are discharged. A plurality of upper composite discharge holes, one or more upper sea supply holes for supplying the sea component polymer supplied from the upper distribution device, and one or more upper island supply holes for supplying the island component polymer. In the upper stage current contraction plate, an upper stage current reduction hole communicating with the upper stage sea discharge hole and the upper stage island discharge hole, or the upper stage composite discharge hole, and a sea introduction hole communicating with the upper stage sea supply hole, An island introduction hole communicating with the upper island supply hole is formed, and in the lower discharge plate, a lower supply hole communicating with the upper contraction hole, and a plurality of lower sea discharge holes communicating with the sea introduction hole, Connected to the island introduction hole A plurality of said lower composite discharge hole communicating a plurality of lower islands discharge holes, or with the sea introduction holes and the island introducing hole is formed,
In the lower-stage flow reducing plate, a lower-stage discharge hole communicating with the lower-stage supply hole, and a lower-stage flow-reduction hole communicating with the lower-stage sea discharge hole and the lower-stage island discharge hole or the lower-stage composite discharge hole are formed. Being.
(3) In the upper stage contracted hole and the lower stage contracted hole, the cross-sectional area in the direction perpendicular to the polymer spinning path direction is smaller at the most downstream position than the most upstream position in the polymer spinning path direction.
(4) A cross-section in which the area in the direction perpendicular to the polymer spinning path direction of the upper stage flow-reducing hole is maximized, or a circumscribed circle in which the area in the direction perpendicular to the polymer spinning path direction of the upper stage flow-down hole is maximized A part of the lower-stage constricted hole is present in a region projected in the polymer spinning path direction. The upper-stage island supply hole, the upper-stage sea supply hole, the island introduction hole, and the sea-introduction hole are within a region in which the lower-stage contraction hole is projected in the polymer spinning path direction, and the upper-stage contraction hole is formed. The composite base according to claim 1, wherein the composite base is present in a region excluding the formed region. 3. The composite die according to claim 1, wherein a hole filling density of the upper island discharge holes and the lower island discharge holes is 2.0 / mm ² or more. The composite die according to any one of claims 1 to 3, which satisfies the requirements (1) to (5).
(1) In a die discharge hole corresponding to the upper stage flow-reducing hole and the lower stage flow-reduction hole and communicating with each other, the cross-sectional area in the direction perpendicular to the polymer spinning path direction is Be smaller at the most downstream position than at the most upstream position.
(2) The mass flow rate of the polymer passing through the upper island discharge hole and the lower island discharge hole is the same, and the mass flow rate of the polymer passing through the upper sea discharge hole and the lower sea discharge hole are the same, or The mass flow rate of the polymer passing through the upper composite discharge hole and the lower composite discharge hole is the same.
(3) The upper sea discharge hole and the lower sea discharge hole have the same hole diameter, hole length, number of holes and hole arrangement, and the upper island discharge hole and the lower island discharge hole have the same diameter, hole length, and hole number. The hole arrangement, the hole length, the number of holes, and the hole arrangement of the upper composite discharge hole and the lower composite discharge hole are the same.
(4) The upper flow contraction hole and the lower flow contraction hole have the same contraction ratio.
(5) The shape in the area | region where the cross-sectional area of the direction perpendicular | vertical to the polymer spinning path | route direction of the said nozzle discharge hole becomes the minimum is the same. The manufacturing method of the composite fiber which melt-spins with the composite spinning machine using the composite nozzle | cap | die in any one of Claim 1 to 4.

Images