JPS6163768A - Production of cloth having silk spun like feeling - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a silk-spun texture that is imparted with excellent bulge and drapability by undergoing knitting or alkali weight loss processing after weaving. The present invention relates to a method of manufacturing a fabric suitable for use in clothing.

[Conventional technology]

Conventionally, ultrafine fibers have been produced by selectively dissolving and removing one polymer component of split-type or seabird-type composite fibers that combine polyethylene terephthalate and different polymers that are incompatible with polyethylene terephthalate, and then forming ultrafine fibers from the remaining segments. A method for producing a fabric having a silk-like texture by imparting fullness and drapability to the fabric using a large number of filaments is known.

However, with such a combination of polymers, it is not possible to use alkali weight loss processing equipment that is widely used industrially to dissolve and remove polymer components that are incompatible with polyethylene terephthalate, and special solvents, for example,
Because it requires special equipment that uses formic acid, sulfuric acid (for nylon), carbon tetrachloride (for polystyrene), etc., it has the drawbacks of lack of versatility and being economically disadvantageous. . As a way to improve these shortcomings,
A method of combining two types of polyester polymer components with different solubility in alkali was considered, but because the difference in alkali weight loss rate between the two types of polymer components was small,
There is a drawback that the alkali weight reduction process causes even the segments of the other polymer component that should normally be left to be thinned out. For this reason, a method of using polybutylene terephthalate as the polyester polymer component with lower solubility in alkali was investigated, but polybutylene terephthalate is suitable for crimped yarn and has excellent stretch back properties. Although it has good performance, it has the disadvantage that when it is made into a large number of ultra-fine filaments, its Young's modulus is low, resulting in an undesirable texture.

[Problem that the invention seeks to solve]

The present invention aims to improve the texture, which is a drawback of the above conventional method, and its purpose is to use a new combination of polyester polymers and composite fibers with a special hollow annular cross section. It is an object of the present invention to provide a method for producing a fabric having a silk-like texture, which is given excellent swelling and drapability after passing through the process.

[Means for solving problems]

The gist of the present invention is to provide two types of polyester polymer components [A] and [B] each having a hollow annular cross section and having different alkali solubility in the cross section.
] are arranged alternately along the circumferential direction of the ring, each forming a triangular cross section, and a total of 8 to
After knitting or weaving the hollow annular conjugate fibers constituting 24 segments into a fabric, it is subjected to an alkali weight reduction process to form a polymer component C with high alkali solubility.
This is a method for producing a fabric having a silk-spun feel, which is characterized by dissolving and removing B) and leaving only segments of the polymer component [A] having a triangular cross section.

The present invention will be explained in more detail below.

In the present invention, the single fiber cross section is hollow ring-shaped, and segments of two types of polyester polymer components having different solubility in alkali are arranged alternately along the circumferential direction of the ring while forming triangular cross sections. After knitting or weaving the arranged composite fibers into a fabric, the hollow annular cross section is made into an ultra-fine one by performing an alkali weight reduction process to dissolve and remove the polymer component with high alkali solubility. By changing the fabric into a large number of filaments with a triangular cross section, the air gap between the filaments is significantly increased while maintaining the fullness of the fabric, giving it high drapability. The aim is to give the fabric a sense of harmony.

The hollow annular single fiber cross section of the composite fiber in the present invention specifically refers to the shape illustrated in FIG. 1, but is of course not limited to this. In Figure 1, l (
The shaded area) indicates the polymer component [A] with low solubility in alkali, and 2 indicates the polymer component [B] with high solubility in alkali. [A], CB) The two types of polyester polymer components are arranged in alternating squares along the circumferential direction of the ring, each forming a triangular cross section, as shown in Figure 1. is necessary. As shown in Figure 2, in the case of a hollow annular cross section in which the segments of two types of polyester polymers [A] and [B] are simply arranged alternately "radially" along the circumferential direction of the ring, ,
The shape of the segments of the polymer component [A] remaining after the alkali weight reduction process becomes flat, making it impossible to obtain a unique silk-like texture.

Area of the hollow part of the hollow annular cross section of the present invention (hollowness ratio)
is not particularly limited, but is preferably in the range of 5 to 30%. Also, the shape of the hollow part does not need to be circular,
There is no problem even if it is a polygon. The total number of segments of the two types of polyester polymer components [A] and CB arranged along the circumferential direction of the hollow annular ring is 8 to 8 in total.
The range needs to be 24. If the number is less than 8, the polymer component remaining after alkali reduction processing [A]
It is difficult to make a filament consisting of segments having a triangular cross section extremely thin, and when there are more than 24 filaments, it is practically difficult to stably perform composite spinning. Also,〔
A] +' CB) The arrangement of the two types of polymer components is not particularly limited, but in order to efficiently elute and remove the polymer component [B] with high alkali solubility in alkaline wave meter processing, The arrangement shown in FIG. 1(a) is preferable to that shown in FIG. 1(bl).

The fineness of the filament formed from the segments of the polymer component [A] remaining after the alkali fJIiffi processing is not particularly limited, but in order to obtain the texture of silk spinning, it should be 0.8 denyl or less, especially 0.5 denyl or less. It is preferable that The fineness of the filaments does not need to be uniform, and the yarn may be a mixed yarn of different finenesses, which is composed of filaments of various different finenesses. Also, the cross section of the triangle is
As illustrated in Fig. 3, various shapes are possible, and depending on the degree of alkali reduction processing, the segments may not be completely separated as shown in Fig. 4; As long as the fibers are flattened and the individual segments can move independently to some extent, there is no problem as long as the silk texture of the present invention can be obtained.

Two types of polyester polymer components [A] in the present invention
, CB) in alkali solubility, that is, the difference in alkali weight loss rate is preferably 5 times or more, particularly 10 times or more.

The hollow annular composite fiber of the present invention can be obtained, for example, as follows. That is, using the composite melt spinning device shown in FIG. 5 and the spinneret device shown in FIG.
[B] Two types of polymer components are arranged in a core-sheath, guided into discharge holes in which U-shaped slits are radially arranged as shown in FIG. 7, and composite melt-spun at 270 to 290°C. FIG. 8 shows the positional relationship of the core-sheath with respect to the discharge holes of the two types of polymer components [A] and [B] on the spinneret discharge surface ^A' in FIG. 6. Changes in the cross section of the melted and discharged single fibers are shown in FIG. 9 as a model according to the positions of AA', 8B', CC', and opening D' in FIG. 6. Discharge hole exit surface A^
At ', the molten polymer discharged from the individual U-shaped slits is still independent of the slit, and at this stage the air forming the hollow part of the hollow annular cross section is entrained. a
Proceeding to n', the U-shaped molten polymers that were independent of each other have ■ Surface tension ■ Barus effect ■ Knealing by laminating two types of polymers with different melt viscosities (pushing from the low viscosity side to the high viscosity side) The cross section was transformed from a U-shape to a V-shape as a result of a complex combination of forces acting on it, which were originally independent.

Each molten polymer discharged from the U-shaped slit adheres to adjacent molten polymers at both ends of the V-shaped cross section, and begins to form a hollow ring.

In the present invention, the difference in melt viscosity between the two types of aggregate components [A] and [B] disposed in the core/sheath is important, and the ]) is slightly lower than the melt viscosity of the polymer component ([B] in Figure 6) disposed in the sheath, the formation of a hollow ring in BB' in Figure 9 is reduced. It can be achieved smoothly. This difference in melt viscosity can be easily controlled by adjusting the intrinsic viscosity of the two types of polymer components [A] and CB (3.11) and by selecting the spinning temperature, so there is no particular problem in industrial production. do not have.

At cc', the deformation of the cross section is further accelerated, and at DD', the outer edge of the cross section becomes circular, and the fiber undergoes rapid and large longitudinal deformation due to the spinning draft, and is wound up as an undrawn yarn. . By the way, [A], CB
) Focusing on the deformation of the cross section of the individual segments of the two types of polymer components, AA'-BB'-CC'-DD
'As a hollow annular cross section is formed,
A], CB) The individual segments of the two types of polymer components are formed from the initial laminated composite fiber with an independent U-shaped cross section in AA', and eventually become the two types of polymer components [A] and [B]. It can be seen that the segments of the polymer component transform into DD' which are arranged alternately along the circumferential direction of the ring, each forming a triangular cross section. Since the U-shaped slit constituting the discharge hole illustrated in FIG. 7 is easily damaged by the pressure when the molten polymer is discharged, it is preferable to provide a small bridge as shown in FIG. Figure 1O (bl shows an example in which a U-shaped slit is provided only on the molten polymer inlet side. The slit width of the U-shaped slit in Figure 7 is 0.05 to 0.15 m. - It is preferable that the distance between both ends of the U-shaped slit is 0.1 to 0.3fi. Also, the depth H of the recessed part of the U-shaped slit is 0.3 to Q , 6ms.

In addition, the distance between adjacent U-shaped slits is 0.05~
Preferably it is 0.15-.

The spun yarn was cooled with cooling air perpendicular to the yarn at 25°C and 70% RH according to a conventional method, and then an oil agent was applied to it.
The yarn is wound as an undrawn yarn at a speed of 000 to 3500 m/min. The undrawn yarn was then stretched between a drawing roller heated to 70 to 95°C and a take-off roller using the drawing t2x machine illustrated in FIG.
It is stretched at a stretching ratio in the range of ~0.85, and heat-treated with a heating element in the range of 100 to 200°C provided between the stretching roller and the take-up roller.

As the alkaline weight loss processing referred to in the present invention, all known industrially adopted alkali weight loss processing methods can be used, and the weight loss rate can be controlled, for example, by using a 3% by weight aqueous solution of caustic soda in the weight loss process. The fabric may be heated and soaked in a boiling state for an appropriate period of time (10 to 80 minutes).

The fabric having a silk-spun texture obtained by the present invention is produced by combining hollow annular composite fibers used in knitting or weaving into two groups of filaments, and creating a difference in heat shrinkage rate between the two groups of filaments. By using a so-called different shrinkage mixed fiber yarn, it is possible to further improve the feel, and this different shrinkage mixed fiber effect can further emphasize the sublimity, that is, the swelling of the fabric. The differential shrinkage mixed fiber yarn of hollow annular composite fibers in the present invention can be easily obtained as follows. That is, as shown in FIG. 12, two undrawn yarns of hollow annular composite fibers are fed to a drawing and twisting machine, and the maximum breaking draw ratio is reached between a drawing roller heated to 70 to 95°C and a take-off roller. The filaments are drawn at a draw ratio in the range of 0.70 to 0.85, and at this time, one group of filaments is run in contact with a hot plate heated to 150 to 230°C to form a low heat shrinkage component with a spring water shrinkage rate of 2 to 8%. None, the other filament group is separated from the hot plate through a suitable guide, and after forming a high heat shrink component with a spring water shrinkage rate of 10 to 25%, these two filament groups are combined on a take-up roller. Then, just roll it up into a pirn. It is preferable that the difference in heat shrinkage rate between the two filament groups of the differentially shrinkable mixed yarn of hollow annular composite fibers obtained in this manner is in the range of 5 to 15% in terms of spring water shrinkage rate. It is preferable that the spring water shrinkage rate of the whole yarn is in the range of 10 to 20%.

If it is outside the above range, the effect of the swelling of the fabric will be small.
Alternatively, the texture of the fabric becomes hard, which is undesirable.

As another method for improving the swelling of the fabric, the hollow annular composite fiber used in the present invention is composed of a single fiber in which high heat shrinkage parts and low heat shrinkage parts are repeated at short intervals along the fiber longitudinal direction. A method of forming latent micro-crimped threads is also possible. This latent micro-crimped yarn is produced by drawing an undrawn multifilament, imparting fiber entanglement to the multifilament, and then passing the bundled one multifilament bundle over a heating body under a tension lower than the heat shrinkage stress of the fiber. Run in contact for a short time,
It can be obtained by subjecting a multifilament bundle to non-uniform heat treatment. The reason why latent micro crimp is imparted by this method is considered as follows.

A multifilament bundle that has been subjected to fiber entanglement treatment has a form in which spread parts and knot parts are repeated along the longitudinal direction of the fibers, as shown in Figure 13. That is, air exists between the single fibers and has a great heat insulating effect. When this filament bundle momentarily runs on a heating element under low tension, it undergoes uneven heating and non-uniform heat treatment as shown in FIG.

Here, H indicates a group of highly heat-shrinkable filaments that have hardly been subjected to heat treatment, L indicates a group of low heat-shrinkable filaments that have undergone strong heat treatment, and J indicates a heating element. When focusing on a single single fiber filament, due to migration due to fiber entanglement, it is repeatedly placed on the high heat shrinkage side H and on the low heat shrinkage side within the fiber bundle at short intervals. Minute loops as shown in FIG. 15 appear, giving sublimeness, that is, bulge.

Specifically, the latent micro-crimped yarn of the hollow annular composite fiber can be obtained as follows. That is, a single undrawn hollow annular composite fiber yarn is supplied to a drawing/twisting machine shown in FIG. 16, and stretched to maximum breakage between a drawing roller 10 heated to 70 to 95°C and a first take-up roller 19. Magnification of 0.70~0
．． Stretch at a draw ratio in the range of 85. The drawn yarn 20 preferably has a relatively high water conduction shrinkage rate of 15 to 25%. Next, between the first drawing roller 19 and the second drawing roller 23, the drawn yarn is first subjected to fiber entanglement treatment by the interlace device 21, and then the yarn 22 bundled by fiber entanglement is heated to 150 to 230°C. The sheet 11 is run in contact with the sheet 11 for a short period of time to perform a non-uniform heat treatment, and then wound into a pirn. Here, the relaxation rate between the first take-up roller 19 and the second take-up roller 23 is important, and the heating body is run under a tension lower than the heat shrinkage stress of the drawn yarn of the hollow annular composite fiber. If the tension is high, the air present in the spread portion of the bundled yarns will be pushed out, reducing the effect of the uneven heat treatment. Furthermore, if the running tension is extremely low, loops and walnuts may occur, which is not desirable.

Therefore, the relaxation rate may be appropriately selected so as to obtain a running tension that is lower than the heat shrinkage stress of the drawn yarn and higher than the formation of loops or walnuts.

Although any known interlacing device can be used as the fiber entangling device, the interlacing device illustrated in FIG. 17 is particularly preferred. The degree of fiber entanglement is preferably such that the number of repetitions of the spread portion and the knotted portion is 100 or more per meter. In addition, from the viewpoint of the texture of the fabric, the water conduction shrinkage rate of the latent micro-crimped yarn of the hollow annular composite fiber obtained as described above is 10 to 20%.
It is preferable that it is in the range of .

In the present invention, the alkali-resistant polymer component [A] must be polyethylene terephthalate in which at least 95 mol% or more consists of ethylene terephthalate units. If it is less than 95 mol%, the strength of the composite fiber is insufficient and it becomes a weak yarn. In order to maintain the strength of the composite fiber, the intrinsic viscosity of the polymer component [A] must be set to 0.65 to 0.75.
It is sufficient to keep it within the range of . Polymer component [A] also exhibits alkali weight loss properties, but as described later, polymer component [B]
The alkali weight loss rate is relatively small at 1/10 to 1/20.

The alkali-reducible polymer component CB) is composed of 85 mol% or more of ethylene terephthalate units, and contains 1 to 5 mol%, preferably 2 to 3 mol% of 5-sodium sulfoisophthalate as a dicarboxylic acid component, and adipine. It is necessary that the modified polyethylene terephthalate contains an acid as a copolymer component in a range of 2 to 10 mol%, preferably 4 to 7 mol%. If the ethylene terephthalate unit content is less than 85 mol%, the strength of the composite fibers will be reduced, and problems such as fuzz due to single fiber breakage will likely occur during the steps from stretching to knitting and weaving. If the content of 5-sodium sulfoisophthalic acid is less than 1 mol%, the melt viscosity of the polymer component CB) during composite fiber spinning becomes small, making it difficult to form a hollow annular cross section as shown in Figure 1. , 5 mol%
On the other hand, if it exceeds this, the melt viscosity will become too high, making it difficult to obtain an appropriate degree of polymerization in the condensation polymerization reaction, resulting in only a polyester polymer with a low intrinsic viscosity, and the strength of the composite fiber will decrease significantly. It ends up. 2 mol% adapic acid
If it is less than 10 mol%, the easy alkali weight loss property is insufficient.
If the temperature exceeds 50%, the thermal stability of the polymer will be poor (this will cause problems such as thread breakage in the spinning process or yellowing of the fibers due to thermal decomposition. [A].

[B] Preferably, two types of polymer components are composite-spun at a temperature of 270 to 290°C. In the present invention, [A],
[B] The difference in melt viscosity when composite spinning two types of polymer components in a core-sheath arrangement is important, and the melt viscosity of the polymer component arranged in the core is higher than the melt viscosity of the polymer component arranged in the sheath. It is preferable to keep it slightly lower.

[A], CB) The melt viscosity of the two types of polymer components can be controlled by their intrinsic viscosity, and this intrinsic viscosity reaches a predetermined value when the torque of the stirrer is applied during the condensation polymerization reaction of each polymer. This can be easily changed by terminating the reaction. [A], [B]
The ratio of the two types of polymer components is [A]: [B] = 2
5-75: A range of 75-25 is possible, but 50-75
65: 50-35 is most preferred.

As shown in FIG. 18, the polymer component [B] in the present invention exhibits an alkali weight loss rate that is about 10 times or more higher than that of the polymer component [A], and this is because 5-sodium sulfoisophthalic acid and Polymer t/( by copolymerization of adipic acid
This is presumed to be due to the disordered iU cell structure, that is, the amorphous region is wide and the arrangement of polymer chains in the amorphous region is extremely low, making it easily attacked by alkali molecules such as sodium hydroxide. .

Specifically, the polymer component [B] in the present invention can be obtained as follows. i.e. 278 kg of dimethyl terephthalate and 227 kg of ethylene glycol.
was added to a 1 m3 reaction vessel equipped with a rectification column, and 10.5 k
g of dimethyl 5-sodium sulfoisophthalate was added as a powder, 11.6 kg of a 2% by weight ethylene glycol solution of magnesium acetate was added, and while the temperature was gradually raised to 120 to 140°C, methanol by-produced was retained outside the thread. put out After 91 kg of methanol was distilled and the transesterification reaction was substantially completed, 0.75 kg of 20% by weight ethylene glycol slurry of Ti1t was added as a lubricant,
Subsequently, a mixture of (ethylene glycol)/(adipic acid) with a molar ratio of 4.0 was heated and reacted, and the esterification reaction rate was 92%.
A reactant with a conversion rate of 85% to bis(2-hydroxyethyl) adipate was added in an amount of 11.3 kg as adipic acid, and at the same time, 3.21 qr of a 2.8 wt% ethylene glycol solution of sodium hydroxide was added. do. Additionally, 10% of trimethyl phosphate as a stabilizer
1.8 kg of ethylene glycol solution 1.5% by weight ethylene glycol solution of antimony trioxide as a polymerization catalyst 8
．． After adding 0 kg and transferring the liquid to the polymerization pot, the temperature was increased to 275°C.
,0. Polymerize for 3 hours at I Torr. The resulting polymer has a 5-sodium sulfoisophthalic acid component of 2.3 mol%, an adipic acid component of 4.8 mol%, and an intrinsic viscosity of 0.57. Note that the amounts of 5-sodium sulfoisophthalic acid and adipic acid can be changed as appropriate within the ranges of 1 to 5 mol% and 2 to IO mol%, respectively, and are not limited to the above specific examples.

〔Example〕

The present invention will be further explained below with reference to Examples.

[Example-1] Polyethylene phthalate having an intrinsic viscosity of 0.65 and consisting essentially only of ethylene terephthalate units was used as the polymer component [A], and 5-sodium sulfoisophthalate was used as the dicarboxylic acid component as the polymer component CB). 2.3 acid
A modified polyethylene terephthalate having an intrinsic viscosity of 0.57 and containing 4.8 mol% of adipic acid as a copolymerization component was used in the composite melt spinning apparatus shown in FIG.
Using the spinneret device shown in the figure, from the discharge hole shown in FIG. Composite spinning was carried out at
The undrawn yarn was wound at a speed of 197 denyl/24 filaments and had a monofilament cross section shown in Figure 1 +8). Furthermore, [A].

[B] The ratio of the two types of polymer components is 50:5 by weight
Measure with the gear pump so that it becomes 0, and then [A] again.

[B] The intrinsic viscosity and spinning temperature of the polymer component [A] were selected so that the melt viscosity of the two types of polymer components at the time of discharge was slightly [A] < CB).

[Example-2] The undrawn yarn obtained in Example-1 was stretched 2.66 times between a stretching roller heated to 85°C and a take-off roller using the stretching apparatus shown in FIG. Heat treatment was performed on a 155°C hot plate installed between the stretching roller and the take-up roller, and 6
It was wound at a speed of 00 m/min. The yarn quality of the obtained drawn fibers is shown below.

Fineness (d) 73.5 Breaking strength (g
/d) 3.28 Breaking elongation (%) 6.4 Spring water shrinkage rate (%) 7.2 [Example-3] The drawn multifilament of the hollow annular composite fiber obtained in Example-2 was used as the weft. For the warp, commercially available 50 denier/36 filament bolier terephthalate with an irregular (△) cross section was used, and with a density of 95 wefts/1° and 70 warps/3 wood/sun, 1/2 twill was used. The fabric was woven according to the specifications, preheat set at 160°C for 1 minute at a relaxation rate of 5% and 5%, and after subsequent scouring, the fabric was placed in a 100°C (boil) bath of 3% caustic soda aqueous solution. 30
It was soaked for a minute and subjected to alkali weight reduction treatment. The alkali weight loss rate was 40%. When the weft yarns of the fabric after the alkali M treatment were removed and observed under a microscope, as shown in Figure 19, the polymer component [B] was eluted and removed, resulting in a polymer component [B] having a triangular cross section. A large number of extremely thin segments consisting only of segments of A] were observed.

[Example 4] The fabric obtained in Example 3 was dyed and then soaped under the following conditions, and subjected to an after heat set at 150°C for 1 minute. The obtained fabric exhibited uniform dyeability and an excellent silk-spun texture with excellent drapability.

Dye Dianix Blue BG-FS (Mitsubishi Chemical Industries) Dye concentration 1%0%1f Dispersant Disper T L O,5Cc/I
t Raulla N20.5'ζ/I! Bath ratio: 1:100 Temperature: 130°C Time: 60 minutes [Example-5] Two undrawn yarns of the hollow annular composite fiber obtained in Example-1 were supplied to the drawing device shown in Fig. 12, and heated to 85°C. The filaments were stretched 2.66 times between a heated drawing roller and a take-up roller, and one group of filaments was heat-treated by being run in contact with a hot plate heated to 185°C, while the other group of filaments was heated through a guide. The filaments were separated from the plate to avoid heat treatment, and then the two groups of filaments were combined on a take-off roller and wound on a burn at 600 m/min. The yarn quality of the obtained differentially shrinkable mixed fiber yarn is shown below.

Fineness (d) 74.1 Breaking strength (g/d) 3.05 Breaking elongation (%) 6.7 Spring water shrinkage rate (%) 18.6 Spring water shrinkage rate (%) of low heat shrinkage filament group 7 .4 Spring water shrinkage rate (%) of the filament group on the high heat shrinkage side 23.5 Same as Example-3 except that this differentially shrinkable mixed fiber yarn was preheated and the relaxation rate was set to 10% for weft and 5% for warp. After that, it was subjected to weaving, scouring, and alkali weight reduction processing, and then dyeing, soaping, and after-heat treatment were carried out in exactly the same manner as in Example-4.

The obtained fabric exhibited an excellent silk-like texture with improved swelling.

[Example-6] The undrawn yarn of the hollow annular composite fiber obtained in Example-1 was
It was supplied to the drawing device shown in the figure, and stretched to 2.66 times between a drawing roller heated to 85°C and a first take-off roller, and then stretched between a first take-off roller and a second take-off roller. Under 5% relaxation conditions, the fibers were first interlaced using the interlacing device shown in Figure 17 with compressed air of 2 kg/am''G so that the number of repetitions of opening and knotting sections was 140 strands/m. After that, the yarn was continuously heated to 185°C and ran in contact at 600 m/min on a hot plate having a length of 30 cm to perform non-uniform heat treatment, and then wound into a pirn. is shown below.

Fineness (d) 75.1 Breaking strength (g/d) 2.98 Breaking elongation (
%) 11.8 Boiling water shrinkage rate (%)
10. The latent micro-crimped yarn was preheat set and the relaxation rate was set to 10% for the weft and 5% for the warp. Dyeing, soaping, and after heat setting were carried out in exactly the same manner as in 4.

The obtained fabric exhibited an extremely excellent silk-like texture with improved swelling.

〔Effect of the invention〕

As described above, according to the present invention, a filament made of ultra-fine filaments having a triangular cross section and suitable for use in clothing.
It is possible to provide fabrics with excellent silk texture, which is extremely effective in diversifying products and increasing added value. Further, according to the present invention, the feel of the fabric can be further improved, and such a fabric can be stably produced industrially.

[Brief explanation of the drawing]

FIG. 1 illustrates a cross section of a hollow annular composite fiber used in the present invention. FIG. 2 illustrates a cross-section of a hollow annular composite fiber outside the scope of the present invention. Figure 3 shows that when hollow annular composite fibers are treated with alkali,
FIG. 6 illustrates an extra-fine filament with a residual triangular cross section. FIG. 4 illustrates a cross section of the hollow annular composite fiber when the alkali treatment is stopped halfway. FIG. 5 shows a composite melt spinning apparatus. FIG. 6 shows a spinneret apparatus for producing hollow annular composite fibers. FIG. 7 shows a specific example of the discharge hole of the spinneret. FIG. 8 is a diagram illustrating the arrangement of the core-sheath with respect to the discharge holes of two types of polymer components [A] and CB). FIG. 9 shows a model of the process in which two types of molten polymers [A] and CB) discharged from the discharge holes form hollow annular composite fibers. FIG. 10 is a diagram illustrating a bridge provided in a U-shaped slit in a discharge hole. FIG. 11 shows a stretching device. FIG. 12 shows a drawing device for producing a differential shrinkage mixed fiber/yarn of hollow annular composite fibers. FIG. 13 shows the form of a drawn multifilament with fiber entanglement. FIG. 14 is a diagram illustrating the reason for the development of latent micro crimp. FIG. 15 is a diagram illustrating the development of latent micro crimp. FIG. 16 shows a drawing device for producing latent micro-crimped yarns of hollow annular composite fibers. FIG. 17 shows an interlacing device. FIG. 18 shows the alkali weight loss rates of two types of polymer components [A] and CB). FIG. 19 shows a cross section of the weft of the fabric obtained in Example-3. 1-Polyester polymer component [A], 2-Polyester polymer component [B], 3-Extruder, 4-Spinning head, 5-Spinneret device, 6-Undrawn yarn, 7-Core-sheath Composite spinning front plate, 8-・~ spinneret plate, 9-bridge part 10-・-
Stretching roller, 11-hot plate, 12-・-
Take-off roller 13...-Pun, 14.
・・Guide, l5・−Opening part, 16・・Knot part, 17−Low contraction part, 18・−High contraction part, 1
9--first take-up roller, 20--drawn yarn, 21-
・Ink lace device, 22-・Fiber entangled yarn, 23-・
Second take-up roller, 24... Compressed air introduction hole, 25-
... Yarn, 26.-Collision plate.

Claims (1)

[Claims] 1. The segments of two types of polyester polymer components [A] and [B] having a hollow annular cross section and having different solubility in alkali in the cross section are triangular, respectively. After knitting or weaving hollow annular composite fibers, which are arranged alternately along the circumferential direction of the ring and forming a total of 8 to 24 segments while forming a cross section of to dissolve and remove the polymer component [B] which has a high solubility in alkali, leaving only segments of the polymer component [A] having a triangular cross section. A method for manufacturing a fabric comprising: 2. The method according to claim 1, wherein the hollow annular composite fiber multifilament is a differentially shrinkable mixed fiber yarn composed of a filament group with a low heat shrinkage rate and a filament group with a high heat shrinkage rate. . 3. The hollow annular composite fiber multifilament is a latent micro-crimped yarn composed of single fiber filaments in which portions with different heat shrinkage rates are repeated at short intervals along the fiber longitudinal direction. The method according to claim 1. 4. Among the two types of polyester polymers, use polyethylene terephthalate in which at least 95 mol% or more consists of ethylene terephthalate units as the polymer component [A] that is difficult to lose weight with alkali, and use the polymer component [B] that is easy to lose weight with alkali. Modified polyethylene in which 85 mol% or more is composed of ethylene terephthalate units and contains 1 to 5 mol% of 5-sodium sulfoiphthalate as a dicarboxylic acid component and 2 to 10 mol% of adipic acid as a copolymer component. A method according to claim 1, 2 or 3, characterized in that terephthalate is used.