JP2001234425A - Conjugate spinning method and conjugate spinneret - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remarkably improved productivity of side-by-side type conjugate synthetic fiber and make the size of whole facility for obtaining spun conjugate fiber compact so as to become the level the same as that of facility for obtaining single fiber and remarkably improve facility and production costs and operation cost. SOLUTION: This conjugate spinning method comprises carrying out melt spinning of conjugate monofilament group in which (A) a thermoplastic polymer having high viscosity and/or high shrink property is laminated to (B) a thermoplastic polymer having low viscosity and/or low shrink property in side-by-side state. The spinning method is characterized by dividing the above conjugate monofilament group into a plurality of linear lines (R1 to R4) and mutually parallel arranging the divided linear lines (R1 to R4) and spinning the conjugate monofilament group in a state in which the above polymer A or B is divided into left and right so that either one of the above polymer (A) or (B) is surely selectively located on right side or left side to each center line of linear line (R1 to R4) group in the line direction. This conjugate spinneret is designed so as to practice the above method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite spinning method for melt-spinning a side-by-side type composite fiber made of a thermoplastic synthetic resin such as polyester or polyamide, and a composite spinneret therefor.

[0002]

2. Description of the Related Art Conventionally, two types of thermoplastic polymers (hereinafter, also simply referred to as "polymer") having different properties such as resin type, viscosity, degree of polymerization, and heat shrinkage properties are produced by eccentric core-sheath type or side-by-side type composite fibers. A technique for developing latent crimpability by melt-spinning is widely known and practiced industrially.

[0003] In this specification, the term "thread" refers to a group of composite single fibers (or a group of composite filaments) composed of a certain number (for example, 12). These are spun as a unit, and these are combined into one bundle (composite multifilament). Further, in the present specification, “the number of composite single fibers (composite filaments)” is indicated by “fil”. Therefore, for example, "12fil yarn" means "composite multifilament composed of 12 composite monofilaments".

Next, the conventional spinning process will be briefly described with reference to FIG. 4. The spinning process is as follows. A spinning die 2 'is mounted on a pack dome of a spin block 1 in which a heating medium 1a is sealed. It consists of a spinning device to which the pack 3 is attached. Such a spinning apparatus is disclosed in, for example, Japanese Patent Application Laid-Open No. 52-53019,
Known ones described in, for example, JP-A-7905 can be used. Therefore, the detailed description of the structure is omitted, and the basic configuration is briefly described below.

First, in order to obtain a side-by-side type conjugate fiber, polymers (A) and (B) as spinning raw materials are
By metering means (not shown) such as a gear pump,
It is supplied to the spinning pack 3 and spun out as a yarn Y from the spinneret 2 ′. Then, the spun yarn Y is controlled by a heat insulating shutter 5 so that the temperature in a region immediately below the spinneret 2 ′ is kept constant, and a cooling device 4 provided on the downstream side thereof is provided.
Cooling.

The cooling device 4 includes a rectifier 4
The cooling air W can be blown out, and the spun yarn Y can be blown out from the cooling start point S indicated by the mark X, while being thinned and solidified in the spinning cylinder 6. can do. At this time, the adiabatic shutter 5
It plays a role in preventing the cooling air blown on the downstream side from flowing into the heat retaining area immediately below the spinneret 3.

At this time, in the melt spinning step of obtaining side-by-side type conjugate fibers from the two kinds of polymers having different properties as described above, when the polymer is discharged from the spinneret 2 ′, the polymer having a component having a high polymer viscosity is used. , A so-called bending phenomenon occurs in which the polymer discharged toward is greatly bent. If such a bending phenomenon occurs in the melt-spinning process, it causes remarkable deterioration of the process condition. As a result, the stability of the melt-spinning process and the stability of the physical properties of the obtained conjugate fiber are greatly affected. give.

For this reason, a conventional technique for preventing the bending phenomenon is disclosed in, for example, Japanese Patent Laid-Open No. 52-53019.
And Japanese Patent Application Laid-Open No. Hei 2-307905. That is, according to these conventional techniques, regarding the flow velocity distribution of the polymer to be bonded, it is considered that the respective speeds are different in the introduction hole of the melt spinneret or in the discharge hole thereof, which is a cause of the occurrence of the bending phenomenon. It has been proposed to employ a means for suppressing the occurrence of a stagnation.

However, even with the conventional techniques for controlling the respective polymer flow rates, the above-mentioned bending phenomenon has not been completely suppressed when the polymer is discharged from the melt spinneret, and the process takes a long time. I have to say that it is not enough to stabilize.

Conventionally, as a spinneret for uniformly spinning each of the conjugate monofilament groups, as shown in FIG. 5, an upper die plate 21 ', an upper intermediate die plate 22', and a lower intermediate die are shown. A spinneret 2 'composed of a four-layered laminated plate composed of a plate 23' and a lower die plate 24 'is used. FIG. 5 (a) is a cross-sectional explanatory view schematically showing a front cross section of a spinneret 2 'laminated in four layers, and FIG. 5 (b) shows a lower die plate 24' as a polymer discharge surface. Discharge hole H seen from the side
It is the perspective view which illustrated the circumferential arrangement | sequence of 4 'group typically.

In the conventional spinneret 2 ', the arrangement of the discharge holes H4' is arranged on the lower die plate 24 'on the concentric circumference group (in FIG. 5, the case of "one concentric circle" is exemplified). The spinnerets 2 ′ arranged rotationally symmetrically at the pitch are used, and the four-layered base plate groups 21 ′ to 24 ′ are provided with polymer (A) groups of discharge holes H4 ′ formed in such a circumferential arrangement. ')
And (B ′) are provided in such a manner as to be bonded side by side and supplied. At this time, the polymer (A ′) is disposed on the outer peripheral side, and the polymer (B ′) is disposed on the inner peripheral side.

Certainly, since the discharge holes H4 'which are rotationally symmetrically formed on such concentric circles are rotationally symmetrically formed on the same concentric circle, the heat history, flow path resistance, This is a very effective method for obtaining a uniform composite single fiber group because conditions such as the flow path length are almost equal. For this reason, the spinneret 2 'having such a type of discharge hole arrangement is usually used.

Further, as proposed in Japanese Patent Application Laid-Open No. 48-56924 or Japanese Patent Publication No. 3-67122, a difference is caused by cooling air blown out of a polymer discharged from a spinneret from a specific direction. So-called "anisotropic cooling spinning", which is a method of obtaining fibers excellent in latent crimpability by cooling in the anterior direction, is also a conventionally used technique.

However, in the spinneret for melt-spinning the side-by-side type conjugate fiber, the discharge holes H4 'which are rotationally symmetrically formed on the circumferences of the concentric circles described above.
Attempting to apply anisotropic cooling to a group of multi-composite single fibers spun from the group causes problems inherent to the discharge hole arrangement.

That is, in the case where the spun conjugated single fiber group bonded to each other side-by-side is anisotropically cooled, the polymer of each conjugated single fiber to be rapidly cooled is placed on the windward side, and each of the conjugated single fibers to be cooled slowly is cooled. Side polymer must always be located downwind. Because if such an arrangement is not feasible, the mechanical strain in the fiber cross-sectional direction imparted during the anisotropic cooling of the composite single fiber group, and the bimetal effect due to the polymers bonded to each other side by side Are mutually offset, and the synergistic effect cannot be expected at all.

However, the spinneret 2 ′ having the discharge holes H 4 ′ which are originally formed on the same concentric circles in a rotationally symmetric manner is spun from the respective discharge holes H 4 ′ as described above. It is another object of the present invention that there is no variation in the quality of each composite single fiber. Nevertheless, the flow of each polymer flowing into each discharge hole itself is such that the polymer on the composite monofilament side to be rapidly cooled is arranged on the windward side and the polymer on the composite monofilament side to be cooled slowly is always arranged on the leeward side. Is to be controlled to have anisotropy, and it is extremely difficult to match the original purpose. This problem is caused by a so-called “multi-eye spinneret pack” in which a plurality of spinnerets are arranged in one spinneret pack in order to spin a plurality of yarns, or a single spinneret is divided into plural spinnerets. It is clear that this is more pronounced in the "split base" for obtaining the yarn of the above.

As described above, as long as the ejection hole arrangement method in which the ejection holes H4 'group is arranged on the circumference of the concentric circle is employed, the composite formed by ejection is formed for each ejection hole H4'. As for the single fiber group, it is inevitable that the mechanical strain generated in the cross section of each fiber varies. For this reason, in the yarn constituted by combining a large number of composite single fibers composed of two types of polymers having a difference in physical properties such as viscosity, latent crimp performance which should be uniform among the composite single fibers is not uniform. Thus, there is no cohesion between the conjugate single fibers, and the crimp pitch in the longitudinal direction of the fibers is unequally spaced, and the yarn has many variations.

In order to solve the above-mentioned problems, various types of spinnerets for composite fibers have been conventionally proposed. However, in these conventional techniques, it is necessary to form a complicated polymer channel from the fate of having to handle a polymer of two or more components, compared to a spinneret most of which consists of a single component polymer. The structure is extremely complicated. As described above, the conventional spinneret for a conjugate fiber has a complicated structure or a complicated polymer flow path. Therefore, when viewed as a spinneret for spinning a single polymer, the shape such as the outer diameter or the thickness of the spinneret itself is not sufficient. Also has to be physically very large. As a result, there has been a problem that the spinning equipment for conjugate fiber itself becomes larger.

In addition, if the size of the equipment increases for the reasons described above, the energy cost involved inevitably increases. Also, in the production machine, without constantly changing the yarn quality of the obtained composite fiber,
There is a destiny that we must maintain a certain level of quality. Therefore, in the point that all spinning conditions represented by the heating temperature of the polymer, the cooling air temperature, the cooling air velocity, etc. set to obtain the conjugate fiber over a long period of time must be maintained uniformly over a wide range. In addition, the technique of spinning composite fibers becomes even more difficult.

Further, as the equipment size increases, the composite fiber spinning becomes extremely difficult to perform a compact layout when performing simultaneous multi-spindle spinning as compared with the spinning using only a single component polymer, and the productivity is also poor. In addition, it raises the problem of lack of flexibility. In addition, it goes without saying that, as the equipment size increases, the equipment manufacturing cost and the parts stock cost also increase.

[0021]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and the object of the present invention is to reduce the influence of the bending phenomenon even if it occurs. It has a very uniform crimp form with little difference in physical properties without receiving much, and can express a regular crimp pitch in the longitudinal direction of the yarn, and spins out two or more yarn groups from one spinneret. It is an object of the present invention to provide a composite spinning method having an advantage of being able to be wound up and a composite spinneret therefor.

Further, according to the present invention, the structure of the composite spinneret pack can be made simple and compact,
Therefore, the entire composite spinning apparatus can be made as compact as the single spinning apparatus, and as a result, the composite spinning method and the composite spinneret for the same can significantly improve the equipment manufacturing cost and the yarn production productivity. Is to be provided.

[0023]

Means for Solving the Problems Here, the composite spinning method of the present invention comprises: (Claim 1) a high viscosity and / or high shrinkage thermoplastic polymer (A), a low viscosity and / or low shrinkage A composite spinning method for melt-spinning a composite monofilament group in which the thermoplastic polymer (B) is bonded side-by-side, wherein the composite monofilament group is divided into a plurality of linear rows and divided.
The divided linear rows are arranged in parallel with each other, and one of the polymers (A) and (B) is always selected on the right or left side with respect to each center line of the linear row group in the row direction. So that the polymer (A)
Or a composite spinning method characterized by spinning a composite single fiber group in a state where (B) is divided into right and left, (Claim 2) a thermoplastic polymer (A) having high viscosity and / or high shrinkage; A composite spinning method for melt-spinning a composite single fiber group in which a low-viscosity and / or low-shrinkage thermoplastic polymer (B) is bonded side-by-side, wherein the composite single fiber group includes a plurality of linear rows. Split into two,
The split single rows are arranged in parallel with each other, and the single row, or a composite single fiber group formed by combining two or more rows adjacent to each other, with each row as one unit with respect to the straight row group. (3) The method according to (2), wherein at least two yarns formed by the method are spun at the same time. (Claim 3) The method according to claim 2, wherein the spun yarns are two. At this time, with respect to a straight line group forming one yarn and a straight line group forming the other yarn, with respect to a center line which divides the two straight line groups into two right and left parts. A composite spinning method, wherein the respective linear rows are arranged so as to be symmetrical with respect to the left and right. (Claim 4) The method according to claim 3, wherein the polymers (A) and ( B) Poly when pasted with side by side The left and right arrangement of the markers (A) and (B) is set forth in claim 3.
The composite spinning method, wherein the composite spinning method is arranged so as to be mirror image symmetric on the left and right with respect to the center line described in claim 5. (Claim 5) The method according to claim 3, wherein 3. The method according to claim 1, wherein the polymer (A) is arranged so that the polymer (A) is located outside and the polymer (B) is located inside. A method of cooling the spun composite single fiber group, wherein a horizontal blown cooling air blown in one direction in parallel with the row direction of the linear row group is used, and Item 7) The method according to Item 6, wherein the alignment direction in which the polymers (A) and (B) are bonded to each other and aligned is substantially perpendicular to the blowing direction of the cross-flow cooling air. A composite spinning method is provided. .

In the composite spinneret of the present invention, (Claim 8) a high viscosity and / or high shrinkage thermoplastic polymer (A) and a low viscosity and / or low shrinkage thermoplastic polymer (B) Is a composite spinneret for melt-spinning the composite monofilament group bonded side-by-side, wherein the composite spinneret has a plurality of discharge holes for spinning the composite monofilament group. Are divided and perforated on a group of linear rows, and the respective linear rows are arranged in parallel with each other, and one of the right and left with respect to each center line of each linear row. On the side, a polymer flow path for individually supplying the polymers (A) and (B) to the respective discharge holes such that either the polymer (A) or (B) is selectively unevenly distributed. A composite spinneret, characterized in that 9.) wherein the polymer (A) (B) and the for feeding individually into each discharge hole, the comb-shaped flow path having a comb-shaped flow path, wherein the polymer (A) for the polymer (B)
A composite spinneret, wherein each of the plurality of comb-shaped channels of the comb-shaped channels is arranged alternately in parallel with each other. 10) The composite spinneret according to claim 8 or 9, wherein the yarn composed of the composite monofilament group is a split spinneret capable of spinning two or more yarns from one spinneret. (Claim 11) The split die according to claim 10, for spinning two yarns, wherein a hole arrangement of a group of discharge holes formed in the split die is formed symmetrically in left and right mirror images, respectively.
The composite spinneret according to claim 10, wherein the composite single fiber group is discharged from each of two groups of discharge holes divided into a left part and a right part that are symmetrical to the left and right images. You.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, as the spinning device to which the present invention is applied, the one illustrated in FIG. 4 can be used except for the spinneret 2 ′. Therefore, also in the present invention, on the assumption that the spinning device schematically illustrated in FIG. 4 is used, in the following description, the reference symbols used in FIG. 4 will be used as they are.

Next, an embodiment of the composite spinneret of the present invention used in the spinning apparatus illustrated in FIG. 4 will be described in detail with reference to FIG. The composite spinneret illustrated in FIG. 1 illustrates an embodiment for spinning two yarn groups from a composite spinneret divided into right and left.

In FIG. 1, FIG. 1 (a) is a cross-sectional explanatory view schematically illustrating an embodiment of the composite spinneret according to the present invention, and in FIG. Reference numeral 22 denotes a disk-shaped middle metal plate, and reference numeral 23 denotes a disk-shaped lower metal plate. These are laminated in three layers as illustrated in FIG. 1A to form a composite spinneret 2. The lamination position is such that the center lines P1 to P3 passing through the centers of the respective base plates shown in FIGS. 1 (b) to 1 (d) to be described later overlap one another vertically.

However, in FIG. 1A, the upper die plate 2
1, the cross-sectional positions of the middle base plate 22 and the lower base plate 23 are different for the sake of convenience in describing the flow states of the polymers (A) and (B) in the respective base plates. It should be noted that the sectional positions of the middle base plate 22 and the lower base plate 23 are different from each other. In addition, to further add, in the drawings described hereinafter including FIG. 1 (a), the high viscosity and / or high shrinkage thermoplastic polymer (A) is simply referred to by the reference symbol “A”, Alternatively, the thermoplastic polymer (B) having low shrinkage is simply represented by "B".

With the foregoing in mind, FIGS. 1B to 1D are referred to for the respective roles of the three-layered base plates described in FIG. 1A. However, each base plate will be described in detail below. 1 (b) to 1 (d) are perspective views. FIG. 1 (b) shows a disk-shaped upper metal plate 21, FIG. 1 (c) shows a disk-shaped middle metal plate 22, and FIG. (D) schematically illustrates the disk-shaped lower metal plate 23.

In FIG. 1 (b), which illustrates the upper die plate 21, in order to spin out side-by-side type conjugate fibers, first, a polymer (eg, a filter (not shown) in a spinning pack) which has passed through a filter (not shown) or the like is used. A) and (B) are supplied from a polymer supply hole H1A and H1B to an upper die plate 21 which is a member constituting the composite spinneret 2.

Although a detailed description is omitted here,
These polymers (A) and (B) do not stay in a specific place for a long time in a process before being supplied to the upper die plate 21 so as not to be thermally degraded while flowing through the spinning pack 3. Needless to say, the design is made in consideration of the above. Further, as mentioned briefly above, it is needless to say that the above-mentioned filter body for removing foreign substances and the like included in the polymer for some reason is also included.

As described above, the polymers (A) and (B) supplied from the upper portion of the upper die plate 21 flow down in the polymer supply holes H1A and H1B, respectively. The gas flows into comb channels G1A and G1B each having a comb channel provided at the bottom.

At this time, as shown in FIG. 1 (b), four comb-toothed flows of a comb-shaped flow path G1A (shown by a thick solid line in the figure) for supplying the polymer (A). The groups of paths are denoted by DA1, DA2, DA3 and DA4, respectively, and a comb-shaped flow path G1B for supplying the polymer (B)
The four comb-tooth-shaped flow path groups (represented by thin solid lines in the figure) are represented by reference symbols DB1, DB2, DB3, and DB4, respectively, and will be described in detail below.

With the above reference numbers in mind, FIG.
Looking at the upper die plate 21 illustrated in (b), the upper die plate 2
In 1, the comb-shaped flow path G1A and the comb-shaped flow path G1B are meshed in parallel so that the flow paths do not intersect. Therefore, each of the comb-shaped channels (DA1, DA
2, DA3, DA4, DB1, DB2, DB3, or D
B4) are arranged in parallel with each other, and these form a polymer distribution channel group alternately arranged in parallel.

At this time, the comb-shaped channel groups DA1, DA
2, DA3, DA4, DB1, DB2, DB3, and D
Regarding B4, when it is distributed to the left and right with reference to the center line P1 of the upper metal plate 21 (indicated by a dashed line in the figure),
The arrangement of the left comb-like channel group is DA1-DB1-DA2.
-DB2, and the arrangement of the right comb-shaped channel group is DB3
-DA3-DB4-DA4 are distributed and arranged in parallel and alternately.

Therefore, the comb-shaped channel group DA on the left side
1, for each of DB1, DA2, and DB2, the polymers (A) and (B) are referred to as polymer (A), polymer (B), polymer (A), and polymer (B), respectively. It will be distributed and supplied. Also,
Right side comb-shaped channel groups DB3, DA3, DB4, and DA
4 is distributed and supplied as polymer (A), polymer (B), polymer (A), and polymer (B).

By forming the comb-shaped distribution channels for distributing the polymers (A) and (B) to the middle die plate 22 in this manner, the center line P1 is set as a symmetry axis and the left half is formed. Channel groups DA1, DB1, DA2, and DB
2 to the left thread, and the right half of the comb-shaped channel group DB
3, the initial preparation for spinning the right yarn from DA3, DB4 and DA4 respectively is completed.

At this time, the above-mentioned comb-like channel group DA
1, DB1, DA2, DB2, DB3, DA3, DB
4 and DA4, the left half and the right half of the middle base plate 22 are arranged symmetrically with respect to the left and right lines (particularly, preferably mirror image with respect to the left and right sides) about the center line P2 as the axis of symmetry. This is preferable for spinning the yarn group from one composite spinneret 2.

The description of the upper base plate 21 is once finished,
Next, the middle die plate 22 having the structure as illustrated in FIG. 1C will be described below. This middle mouthpiece plate 22,
Each of the comb-shaped flow paths DA1, to which the polymers (A) and (B) distributed and supplied from the upper die plate 21 are distributed and supplied,
DB1, DA2, DB2, DB3, DA3, DB4, and DA4, respectively, and serve to individually supply these distributed polymers to predetermined positions of the lower die plate 23, respectively. At the same time as this role, each polymer (A) distributed and supplied in the lower die plate 23 described later.
And (B) are also merged, and also play a role as a polymer introduction member for bonding side-by-side.

Here, in order to facilitate the understanding of the following description, the middle base plate 22 is formed similarly to the case of the upper base plate 21.
A center line P2 (shown by a dash-dot line in the figure) passing through the center of is assumed. Then, regarding the polymer arrangement for spinning the side-by-side type composite single fiber, the polymer (B) is arranged at a position close to the center line P2 side with respect to the center line P2, while the polymer (A) is arranged. Center line P2
It is necessary to arrange it at a position far from.

As described above, the polymers (A) and (B)
The reason for arranging is described later in detail, and will be briefly described here. That is, the reason is that each polymer bonding surface where each of the distributed and supplied polymers (A) and (B) is bonded side-by-side,
This is because even after spinning, they are all aligned in a certain direction. Then, the middle base plate 22 correctly plays an auxiliary role for fulfilling such a function.

Therefore, in order to actually realize the above-described side-by-side type polymer arrangement, each of the comb-shaped channel groups DA1, DB1, DA2, and DB2 indicated by broken lines in FIG. And the inlet hole group H immediately below
2A1, H2B1, H2A2, and H2B2 are perforated along each comb-shaped channel while forming rows.
At this time, a pair of adjacent comb-tooth channels DA1 and DB1 and a comb-tooth channel D necessary for spinning the conjugate single fiber
Each of the introduction hole groups H2A3, H located immediately below A1 and DB1
2B3, H2A4, and H2B4 are paired with each other (each introduction hole group H2A1 and H2B1, and each introduction hole group H
2A2 and H2B2) are arranged side by side in parallel as a pair.

The comb-shaped channel group DB located on the right side
3, DA3, DB4, and DA4, similarly, these comb-shaped channel groups DB3, DA3, DB4, and DA4.
Corresponding to each of them, the inlet holes H2B3, H
2A3, H2B4, and H2A4 are perforated along each comb-shaped flow path while forming rows. Therefore, also in this regard, each pair of adjacent comb-like channel groups DB3, DA3, DB
4, and each introduction hole group H2B3 located immediately below DA4,
H2A3, H2B4, and H2A4 are arranged side by side in parallel as a pair while forming pairs (each of the introduction hole groups H2B3 and H2A3, and each of the introduction hole groups H2B4 and H2A4).

After the above-mentioned steps, the polymers (A) and (B) finally distributed and supplied are finally obtained.
Are joined and bonded in a group of discharge holes H3 perforated in the lower die plate 23 shown in FIG. 1 (d), and then discharged from each of the discharge holes H3 and spun as a side-by-side type composite single fiber group. It will be.

Then, finally, the lower die plate 23 located at the last position in the die plate group laminated in three layers is shown in FIG.
This will be described in detail below with the aid of (d). In the middle base plate 22 already described, the introduction hole groups H2A1 and H2B1, and the introduction hole group H2, which are paired with each other, respectively.
A2 and H2B2, introduction hole groups H2B3 and H2A3, and introduction hole groups H2B4 and H2A4 have been described. Therefore, these introduction hole groups H2A1, H2B1, H
FIG. 1D shows 2A2, H2B2, H2B3, H2A3, H2B4, and H2A4 displayed by solid lines and superimposed.
It is. Therefore, in FIG. 1D, the introduction hole group H2A
1, H2B1, H2A2, H2B2, H2B3, H2A
3, H2B4 and H2A4 are indicated by solid lines.
These are not actually perforated in the lower base plate 23.

Accordingly, as is apparent from FIG. 1D, in the lower die plate 23, a plurality of linear rows R1, R2, R
3 and R4, and the linear rows R1, R2, R3, and R4 can be juxtaposed to each other in the group of ejection holes H3.

Of course, at this time, the introduction hole groups H2A1 and H2B
1. The introduction hole groups H2A2 and H2B2, the introduction hole groups H2B3 and H2A3, and the introduction hole groups H2B4 and H2A4 are arranged side by side immediately above each discharge hole H3 as a pair. For this reason, when these polymers flow into the respective discharge holes H3, the polymers (A) and (B) merge in the respective discharge holes H3, are bonded to each other, and are spun. .

In this case, one of the polymers (A) and (B) is always on the right side with respect to the center line of each of the linear rows R1, R2, R3, and R4 in which the discharge holes H3 are arranged. Or, a state where the polymer (A) or (B) is distributed to the left and right so as to be located on the left side (particularly, the center line P3 is used as a symmetric axis, and the polymer (A) or (B) is bonded so as to be mirror-image-symmetric with respect to the center line P3) In a mixed state).

That is, by such a device, the center lines of the linear rows R1, R2, R3, and R4 are
The polymer (A) and the polymer (B) are individually supplied to each of the discharge holes H3 such that either the polymer (A) or the polymer (B) is selectively localized on one of the right and left sides. It is possible to do.

The residence time of the polymer (A) and the polymer (B) distributed in each discharge hole using the comb-type distribution channel of the present invention in the die is the same as the conventional circumference illustrated in FIG. Unlike the array composite spinneret, the discharge holes are not perforated in a rotationally symmetric manner, and therefore differ for each discharge hole. Therefore, the difference in residence time is not originally desirable in spinning of synthetic fibers that require homogeneous polymer physical properties, but as a result of our investigation, the difference in residence time in this die is very few seconds at most. Since it is slight, it is considered that the possibility of leading to variation in yarn physical properties is extremely low.

Regarding this, even in the results of the spinning test using the composite spinneret of the present invention, the uniformity of the physical properties is equal to that of the fiber produced by using the conventional circumferential array composite spinneret. It should be added that the result was obtained.

In the composite spinning method of the present invention, when the yarn group spun in a molten state from the composite spinneret 2 described above is solidified, one yarn is regarded as one unit. In addition, as shown in FIG. 2 (a), the bonding direction of the polymers of all the composite single fiber groups constituting this single yarn is set to be in a state of being aligned in one specific direction. I do. That is, the alignment direction in which the polymers (A) and (B) are bonded to each other and aligned can be substantially perpendicular to the blowing direction of the lateral blowing cooling air.

Accordingly, in this manner, in the cooling of the spun composite single fiber group by the laterally blown cooling air W blown in parallel in one direction, the fibers are asymmetrically cooled by the laterally blown cooling air W from one direction. Even if a mechanical strain is applied in the cross-sectional direction of the steel sheet and a potential three-dimensional crimping property is applied, crystallization proceeds uniformly, and uniform shrinkage characteristics without variation can be exhibited. .

As shown in FIG. 2B, the cross-sectional shape of the composite single fiber spun from the composite spinneret 2 by the composite spinning method of the present invention is not limited to a round cross-section, but may be hollow or irregular. It is needless to say that the present invention can be applied to melt spinning of any side-by-side composite synthetic fiber.

The method of spinning a side-by-side type composite fiber using the composite spinneret 2 in which the discharge holes H3 groups are arranged symmetrically in parallel in the left and right directions according to the present invention is performed by setting the discharge holes H3 formed in the composite spinneret 2 to the center line P3. Are arranged line-symmetrically (particularly mirror image symmetry is preferred) half to the left and right with the symmetry axis as the axis of symmetry. By employing such an arrangement, the same latent crimping performance can be exhibited for the two yarn groups spun from the composite spinneret 2 divided into two right and left parts.

Further, in the embodiment as shown in FIG. 2, the composite spinneret 2 of the present invention was used to perform melt spinning by cooling with a horizontal blowing cooling air W blown in parallel from one direction. In group H3, high viscosity or high shrinkage polymer (A) and low viscosity or low shrinkage polymer (B)
It is also important for the split type composite spinneret 2 to be arranged in parallel with the direction perpendicular to the blowing direction of the cooling air as shown in FIG.

This is because all the spun composite single fibers are subjected to asymmetrical cooling by the transversely blown cooling air W from one direction, so that a mechanical strain is imparted in the fiber cross-sectional direction. Because you can do it. Thus, even if uniform latent three-dimensional crimpability is imparted, each of the yarns spun from the left and right sides of the split-type composite spinneret 2 or the respective composite monofilament groups constituting the same are all This is because crystallization proceeds uniformly and uniform shrinkage characteristics are exhibited. As a result, the same latent crimp performance can be expressed between the left and right yarns.

Further, by adopting the polymer distribution and the arrangement of the discharge holes H3 as in the present invention, even if the polymer discharged from each discharge hole H3 exhibits a bending phenomenon, as shown in FIG. Thus, it becomes possible to start taking over without affecting other composite single fiber groups other than itself. Further, by arranging the ejection holes in a completely line symmetrical manner (particularly, mirror image symmetry) on the left and right sides of the composite spinneret 2, even if a bending phenomenon occurs in the left and right yarn groups, this phenomenon is rather used. can do.

That is, the two composite monofilament groups constituting the left and right yarns are bent in opposite directions when viewed as one group, and the composite monofilaments are mixed between the left and right yarns. And can be separately dropped into the lower spinning cylinder. Therefore, after leaving the spinning cylinder, the left and right halves can be further passed through different oil agents and different guides, respectively.
As a result, the two yarns can be separately wound by a winder.

Due to these effects, the composite single fiber in each weight has a very uniform crimp configuration with almost no difference between the composite single fibers, and a regular and uniform crimp is developed in the longitudinal direction of the yarn. After the yarn group is spun from a set of the composite spinnerets 2 and cooled and solidified, it is possible to wind up two yarns at the same time.

[0061] This also makes it possible to provide a woven fabric having excellent stretchability, bulkiness, texture, dyeing, coloring, or gloss, and having extremely good touch, wearability and appearance.

Further, by adopting the present spinning method, the spinneret becomes simple and compact, but it is possible to simultaneously pick up an extremely large number of yarns in a limited space. To make the whole as compact as the single spinning equipment or more, to significantly reduce the equipment manufacturing cost, stock holding cost, and yarn production energy cost, as well as to significantly improve the yarn production productivity of side-by-side composite synthetic fibers. Can be done.

[0063]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. In addition, each physical property or evaluation in an Example and a comparative example was measured or evaluated by the following methods.

(1) Number of emerged crimps [co / cm] After winding the spun yarn at a predetermined speed, the number of crimps appearing on the stretched yarn which has been subjected to normal stretching and heat treatment is collected. The sample is extracted and measured from any 10 points in 1 m of the sampled yarn. This measurement was repeated for each winding length of about 10 ⁶ m, and the average value and the variance were used.

(2) Total crimp ratio (TC: Total Cr)
imp) [%] The total crimping ratio (TC) was measured by the following method which has been widely used. In the conventional measurement method, the “fineness” is indicated by de (denier), and thus the value is converted from the de value to the dtex value. In addition,
For reference, the de value used for conversion to the dtex value is also shown in parentheses (). First, 441 is added to the sample to be measured.
A tension of μN / dtex (50 mg / de) is applied and wound around a skewer frame to make a scab of about 3333 dtex (3000 de). After making the case, 17.6μN /
dtex (2 mg / de) + 1764 μN / dtex
(200 mg / de) is applied, and the length L0 (cm) after 1 minute is measured. Then, 1764 μN /
After removing the dtex (200 mg / de) load, the substrate is treated in boiling water at 100 ° C. for 20 minutes. After the boiling water treatment, the load of 17.6 μN / dtex (2 mg / de) is removed, and the mixture is air-dried in a free state for 24 hours. 17.6 μN / dtex (2 mg / d
e) A load of +1764 μN / dtex (200 mg / de) is applied, and the length L1 (cm) after 1 minute is measured. Then, 1764 μN / dtex (200 mg / dtex
de) and the length L2 (c) after 1 minute has passed.
m) was measured, and the total crimp rate was calculated by the following calculation. TC (%) = {(L1−L2) / L0} × 100 The values were represented by the average of 10 measurements, and the variance of each measured value was represented by the variance.

(3) Fineness [dtex] Approximately 100 m of yarn is extracted from any 10 places of the original yarn sample wound with the spun yarn at a predetermined speed, and its weight is measured. This weight was converted to a unit of 10,000 m and expressed using the average value and the variance.

(4) Breaking strength [cN / dtex] After winding the spun yarn at a predetermined speed, the breaking strength of the drawn yarn that has been subjected to normal drawing and heat treatment is measured 10 times, and the average value is used. Expressed.

(5) Elongation at break [%] After winding the spun yarn at a predetermined speed, the elongation at break of the drawn yarn which has been subjected to normal stretching and heat treatment is measured 10 times, and the average value is used. Expressed.

(6) Boiling water shrinkage [%] After the spun yarn is wound at a predetermined speed, the drawing water is subjected to normal stretching and heat treatment, the boiling water shrinkage is measured 10 times, and the average value is used. Expressed.

(7) Fineness unevenness (U%) [%] After the spun yarn is wound at a predetermined speed, the fineness unevenness of the drawn yarn that has been subjected to normal stretching and heat treatment is measured 10 times. It was expressed using the average value.

Example 1 In order to obtain two yarns from one composite spinneret as a composite spinneret, spinning was carried out according to a conventional method using a split die schematically illustrated in FIG. At this time, as the polymer (A), a high-viscosity polyethylene terephthalate (P) having an intrinsic viscosity of 0.64 was used.
ET) was used. Further, by using a low-viscosity polyethylene terephthalate (PET) having an intrinsic viscosity of 0.39 as the polymer (B), the difference in intrinsic viscosity between the polymer (A) and the polymer (B) becomes 0.25. It was adjusted to become. And these polymers (A) and (B)
Using a composite spinneret having a hole diameter of φ64 mm and a group of round discharge holes of 24 holes, polymer (A) was used for 1.5 times.
cm ³ / min / hole, and 1.5 c of polymer (B)
The mixture was fed to each of the discharge holes at a rate of m ³ / min / hole, and the mixture was spun from each of the discharge holes.

At this time, the cooling by the unidirectional side-blowing cooling air is started at a position about 100 mm downstream from the polymer discharge surface in the yarn take-off direction with respect to the polymer discharge surface of the composite spinneret. The yarn was taken off at a take-up speed of 1450 m / min according to a conventional method using a cooling method for the yarn in which the blowing of the cooling air to the polymer was stopped at a position about 600 mm downstream from the polymer discharge surface. At this time, the temperature of the cooling air was maintained at 20 # C, and was blown onto the spun yarn at an air velocity of 0.5 m / sec.

The two side-by-side composite yarns thus obtained had a round cross-section where the area occupied by the polymer was 50:50 when viewed in cross-section. When the cross section of the composite yarn obtained at this time was observed, the polymer bonding surface exhibited a gentle curve that became convex on the high viscosity side. Thereafter, the drawing ratio, the drawing speed, and the drawing temperature are appropriately set so that the elongation of the composite yarn obtained in the spinning step becomes 40%, and drawing and heat treatment are performed. And 56dtex (50
de) A 12-fil stretched composite yarn was obtained.

Example 2 Using one composite spinneret having a 12-hole discharge hole group, a 56 dtex (50 d
e) The procedure was the same as in Example 1 except that one composite yarn of 12 fill was obtained.

[Comparative Example 1] Using the same polymer as in Example 1, the conventionally used discharge holes are arranged at equal pitches on a concentric circle, and high-viscosity PET is formed on the outer peripheral side.
Designed so that low-viscosity PET is arranged on the inner circumference side,
Using a two-hole composite spinneret, one side-by-side composite yarn was spun from one composite spinneret. At this time, a drawn yarn having 56 dtex (50 de) and 12 fill was obtained according to Example 1, except that a composite spinneret having a 12-hole circumferentially arranged discharge hole group was used as the composite spinneret.

Comparative Example 2 Using the same polymer as in Example 1, a group of 24 discharge holes was arranged on a concentric circle.
In addition, the discharge hole group of 24 holes is arranged separately for each of 12 holes on the left and right sides, and further, using a spinneret having a circumferential arrangement in which the high-viscosity PET is disposed on the outer circumference and the low-viscosity PET is disposed on the inner circumference, One composite yarn was spun from one composite spinneret. At that time, the same procedure as in Example 1 was carried out except that a composite spinneret having a circumferential arrangement having a discharge hole group of 24 holes was used. Then, the spun yarn thus obtained is stretched, and 56 dte
x (50 de) and two drawn composite yarns of 12 fill were obtained.

The respective results are shown in Tables 1 and 2. As is clear from the results shown in Tables 1 and 2, Examples 1 and 2 were both homogeneous,
And it had excellent crimp characteristics. Further, in Example 1, excellent crimping characteristics and yarn physical properties were exhibited evenly on both the left and right yarns without much difference from Example 2.

On the other hand, in Comparative Example 2, although the crimping performance itself was exhibited, in terms of the crimping characteristics, the crimp varied in the longitudinal direction of the yarn, and the uniform It cannot be said that it has compression performance. In particular, in Comparative Example 2, it is extremely difficult to perform the initial threading by completely splitting and spinning the two yarns due to the bending phenomenon at the time of discharging the polymer from the composite spinneret. Even after the start, the conjugate single fibers often intermingled in both yarns, and it was extremely difficult to stably perform continuous production itself.

From these results, the spun composite yarn was melted and solidified by cooling with the transverse blowing cooling air from one direction, and at this time, all the composite single fibers were moved in the cooling air blowing direction. The embodiments of Examples 1 and 2 in which the two types of polymers A and B were arranged in parallel in the vertical direction were excellent in the function of making the crimp characteristics of the yarn uniform.

Further, by using the spinneret structure of the present invention, it is possible to take out two yarns from a single composite spinneret very easily. As a result, the spinning productivity of the side-by-side composite yarn is remarkably improved, and the size of the composite spinneret of the side-by-side composite yarn can be reduced. As a result, it has become possible to keep the size of the conjugate fiber spinning equipment itself very small.

Also, since the size of the equipment can be reduced, the composite fiber spinning equipment using the composite spinneret of the present invention has the same advantages as the single fiber spinning equipment for spinning a single polymer. The arrangement of the yarn-making equipment became possible, the productivity was improved, and in addition, the flexibility was excellent. In addition, as the equipment size has been reduced, the utility cost, equipment manufacturing cost, and component stock cost have been significantly reduced.

[0082]

[Table 1]

[0083]

[Table 2]

[0084]

As described above, according to the composite spinning method and the composite spinneret of the present invention, problems such as insufficient crimping performance of the composite yarn and variations in the crimpability, which occur in the conventional method, are caused. Even when the composite single fibers are compared with each other, the composite single fibers have a very uniform crimp form with almost no difference between the composite single fibers, and exhibit a regular crimp pitch in the longitudinal direction of the yarn. It became possible. In addition, this makes it possible to provide a woven fabric having excellent stretchability, bulkiness, texture, dyeing, coloring, or gloss, and extremely good touch, wearability, and appearance.

Further, since the composite spinning apparatus and the composite spinneret of the present invention make it possible to design the composite spinning apparatus simply and compactly, the composite spinning equipment as a whole can be made as compact as the single spinning equipment. This has an industrially extremely advantageous effect that the facility manufacturing cost and yarn production productivity can be significantly improved.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram for schematically explaining the structure and function of a composite spinneret used in the present invention, wherein FIG. 1 (a) is a sectional view, FIG. 1 (b) is an upper die plate, and FIG. ) Is a perspective view schematically illustrating a middle base plate, and FIG. 4D is a perspective view schematically illustrating a lower base plate.

FIG. 2 is a schematic explanatory view illustrating an embodiment of one-way lateral blowing cooling applied to the composite spinning method of the present invention.

FIG. 3 is a schematic diagram illustrating a bending phenomenon.

FIG. 4 is an explanatory view schematically illustrating a composite spinning process to which a composite spinning method and a composite spinneret are applied.

FIG. 5 is a cross-sectional view schematically illustrating a conventional composite spinneret having a circumferentially arranged discharge hole group.

[Explanation of symbols]

 2 Composite spinneret 21 Upper die plate 22 Medium die plate Polymer distribution plate 23 Lower die plate A High-viscosity and / or high-shrink thermoplastic polymer B Low-viscosity and / or low-shrink thermoplastic polymer DA1-DA4 polymer ( A) Comb-shaped flow path for DB1 to DB4 Comb-shaped flow path for polymer (B) G1A Comb-shaped flow path for polymer (A) G1B Comb-shaped flow path for polymer (B) H1A For polymer (A) Polymer supply hole H1B Polymer supply hole for polymer (B) P1 to P3 Center line R1 to R4 Linear row

Claims (11)

[Claims] 1. A composite single fiber group in which a high-viscosity and / or high-shrinkage thermoplastic polymer (A) and a low-viscosity and / or low-shrinkage thermoplastic polymer (B) are bonded side-by-side to each other. A composite spinning method for spinning, wherein the composite single fiber group is divided and divided into a plurality of linear rows,
The divided linear rows are arranged in parallel with each other, and one of the polymers (A) and (B) is always selected on the right or left side with respect to each center line of the linear row group in the row direction. So that the polymer (A)
Alternatively, a composite spinning method characterized by spinning a composite single fiber group in a state where (B) is divided right and left. 2. A composite single fiber group in which a thermoplastic polymer (A) having high viscosity and / or high shrinkage and a thermoplastic polymer (B) having low viscosity and / or low shrinkage are bonded side by side is melted. A composite spinning method for spinning, wherein the composite single fiber group is divided and divided into a plurality of linear rows,
The split single rows are arranged in parallel with each other, and the single row, or a composite single fiber group formed by combining two or more rows adjacent to each other, with each row as one unit with respect to the straight row group. A composite spinning method characterized by spinning out at least two yarns formed at the same time. 3. The method according to claim 2, wherein the yarn to be spun is two yarns, in which case a straight line group constituting one yarn and another yarn constituting the other yarn. With respect to the linear row groups, each of the linear row groups is arranged so as to be symmetrical with respect to the center line which divides the two linear row groups into two parts. Composite spinning method. 4. The method according to claim 3, wherein the right and left arrangement of the polymers (A) and (B) when the polymers (A) and (B) are bonded side-by-side.
A composite spinning method, wherein the composite spinning method is arranged so as to be mirror image symmetric on the left and right with respect to the described center line. 5. The method according to claim 3, wherein the polymer (A) is located outside and the polymer (B) is located inside the center line. Composite spinning method. 6. The method according to claim 1, wherein, when cooling the spun conjugated single fiber group, parallel blowing is performed in one direction along a row direction of the linear row group. A composite spinning method characterized by using wind. 7. The method according to claim 6, wherein an alignment direction in which the polymers (A) and (B) are bonded to each other and aligned is substantially perpendicular to a blowing direction of the cross-flow cooling air. A composite spinning method, characterized in that: 8. A composite single fiber group in which a high-viscosity and / or high-shrinkage thermoplastic polymer (A) and a low-viscosity and / or low-shrinkage thermoplastic polymer (B) are bonded side-by-side and melted. A composite spinneret for spinning, wherein a discharge hole group for spinning the composite single fiber group is divided and perforated in a plurality of linear row groups in the composite spinneret. The linear rows are arranged in parallel with each other, and the polymer (A) or (B) is disposed on one of the left and right sides with respect to the center line of each linear row. A composite spinneret, wherein polymer flow paths for individually supplying the polymers (A) and (B) to the respective discharge holes are formed so that one of them is selectively unevenly distributed. . 9. A comb-shaped flow path having a comb-shaped flow path for individually supplying the polymers (A) and (B) to the respective ejection holes is provided for the polymer (A) and the polymer (B). )
A composite spinneret, wherein each of the plurality of comb-shaped flow paths is formed in a different shape, and the flow path groups forming the respective comb-shaped flow path portions of the respective comb-shaped flow paths are alternately arranged in parallel. 10. The composite spinning device according to claim 8, wherein the yarn composed of the composite single fiber group is a split spinneret capable of spinning two or more yarns from one spinning spinneret. Base. 11. A split die according to claim 10, for spinning two yarns, wherein a hole arrangement of a group of discharge holes formed in said split die is formed symmetrically in left and right mirror images, respectively.
The composite spinneret according to claim 10, wherein the composite single fiber group is discharged from each of two groups of discharge holes divided into a left part and a right part, which are symmetrical to the left and right images.