JPH0341569B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a two-component composite yarn that can suitably obtain fibers constituting high-quality fabrics having silk-like luster and texture, and is also suitable for warp yarn in non-twisted and glue-free weaving using a water jet loom. Regarding yarn. Conventionally, it has been proposed in Japanese Patent Publication No. 39-29636 to remove one component from a split-type composite yarn in which one component is divided into the other to create a split yarn with a different cross-section.
No. 48-37044, JP-A-54-
It is well known from publications such as No. 6965 and Japanese Unexamined Patent Publication No. 54-27058. Although the split yarn obtained from the split-type composite yarn has a silky luster, the cross section of the split yarn may have a planar part, or the yarn may have an irregular cross-section, such as a quarter circle or a one-third circle. Therefore, fabrics using split yarns obtained from these split-type composite yarns are different from trilobal cross-section yarns, which have been widely used in the past. The reality is that compared to fabrics using, for example, Y-shaped cross-section yarns or T-shaped cross-section yarns, only fabrics with a glittering luster can be obtained. On the other hand, it is well known that a multifilament yarn made of a thermoplastic polymer is subjected to fluid entanglement treatment to intertwine the filaments to form an interlace yarn. Consideration has been given to weaving it into yarn. In general, as the degree of entanglement of interlaced yarn increases, the convergence improves,
Since this improves weavability to some extent, studies have focused on improving the degree of entanglement, especially for water jet looms. For example, special public relations
No. 1175 and Japanese Patent Publication No. 47-43787 disclose techniques for improving the degree of entanglement of multifilament yarns by improving fluid entanglement treatment nozzles. Also, Special Publication No. 55-20018,
Japanese Patent Publication No. 56-9975 discloses a technique in which the guide positions provided before and after the fluid entanglement treatment nozzle are regulated, and the entanglement property is improved by devising the fluid treatment area. Although these nozzle improvements and entangling treatment method improvements are effective in improving the convergence of multifilaments, good weavability cannot be obtained by these improvements alone. In other words, when weaving in a water jet loom using an interlaced yarn with simply improved cohesiveness as a warp yarn, single yarn breakage occurs due to friction between the warp yarns and between the warp yarns and the metal part of the spliced yarn due to the movement of the heddles and reeds. There is a problem that this causes fuzz, which causes poor opening of the loom and even stoppage of the loom, and for this purpose, it is necessary to take into account wear resistance. As a method for improving the abrasion resistance of interlaced yarns, for example, Japanese Patent Publication No. 50-28533 and Japanese Patent Publication No. 52-39935 disclose methods of improving abrasion resistance by imparting slipperiness to interlaced yarns with an oil agent. Although methods have been disclosed, since these methods apply a slippery oil to the undrawn yarn before winding, it is difficult to control the amount of oil deposited, and the amount of deposit varies in the longitudinal direction of the yarn. , interlace yarn has the disadvantage that the abrasion resistance changes in the longitudinal direction of the yarn, and the abrasion resistance is maintained only by the oil coating on the yarn surface, so interlaced yarn has essentially low abrasion resistance.
In particular, in the case of a thermoplastic multifilament yarn consisting of fine filaments of 2.5 deniers or less, especially thermoplastic multifilament yarns of filaments of 2.5 deniers or less and having a trilobal cross section, it can be used as a warp yarn for waterjet loom weaving. The problem is that it is difficult to obtain something that is practical. The purpose of the present invention is to solve the drawbacks of the prior art, that is, the cross section of the split yarn obtained from the split type composite yarn is
It has a planar part, a quarter circle shape, 3
Problems in weaving due to the fact that the fabric has a shape of a quarter circle or a prism, which causes a glare to the fabric, and the low abrasion resistance of the interlaced yarn in trilobal cross-section multifilament. By solving problems such as the occurrence of warp yarns and the difficulty of weaving as warp yarns in a water jet loom, we have created a raw material suitable for woven and knitted fabrics that has good weavability and has an elegant luster and texture without glare. It's about providing the thread. That is, in the present invention, in a composite yarn having a four-lobed cross section in which the A component is divided into two B components, each of the divided A components in the cross section has two opposing vertices C, T including D
type, and is 2.5 denier or less, the ratio of the length of the line segment CD to the line segment EF connecting the other vertices E and F is 0.5 to 4, and the polymer forming the A component is polyester or polyamide. , the polymer forming the B component is composed of a two-component composite yarn, which is a polymer that is more soluble in solvents than the polymer forming the A component, is interlaced, and has an abrasion resistance of 2000 cycles or more. This is a two-component composite yarn for use in warp yarns for non-twisted and non-sizing weaving, which is characterized by the following: The cross section of the two-component composite yarn in the present invention will be explained below with reference to the drawings. 1 to 4 are diagrams showing typical cross sections of a two-component composite yarn having a four-lobed cross-sectional shape in the present invention. In FIG. 1, the A component is divided into two by the B component, and each divided A component has two opposing vertices in a four-lobed shape. By dissolving and removing component B from the composite yarn having such a shape, component A can be made into two trilobal cross-sectional filaments as shown in FIG. 5, with little or no change in shape. 2, 3 and 4 show other examples of the composite yarn in the present invention, and FIGS.
The trilobal cross-sectional shape of the A component obtained after dissolving and removing the B component from the composite yarn shown in the figure can be made into a filament having a shape different from the trilobal cross-section of FIG. After dissolving and removing component B from the yarn, it is possible to obtain two filaments with different trilobal cross-sectional shapes and deniers. The four-lobed cross section in the present invention has four convex portions on the outer periphery of the yarn cross section when viewed from inside the yarn. In order to easily make the cross-sectional shape of each divided A component into a T-shaped cross section, a shape in which convex portions and concave portions are alternately repeated is required.
In order to perform stable yarn spinning, it is preferable that the yarn be rotationally symmetrical when the center of gravity of the yarn is the center of the rotation axis. In the cross section of the composite yarn in the present invention, each of the divided A components has a T-shape including the opposing vertices of the four-lobed cross section, and the cross-sectional shape of the A component has an elegant silky shape that has been used in the past. It has a T-shaped cross section that can exhibit luster and texture. The apex here refers to any point on the circumference that is one convex shape when viewed from the center of the yarn, and is the most distant point from the center of gravity of the yarn, and the opposing apex is illustrated in Figure 6. In the cross section of the four-lobed cross-section yarn, points C and D are opposite vertices, and points E and F are opposite vertices. In the present invention, the cross-sectional shape of the two-component composite yarn is
This is a more important requirement than that of imparting silky luster and texture to the fabric after dissolving and removing component B. As illustrated in FIG. 6, in the cross section of the four-lobed cross-section yarn, for two A components formed via the B component, two in the A component that is far apart from the B component.
Length of line segment CD connecting vertices C and D, and vertices C and D
A line segment connecting the other two vertices E and F between
The length ratio of EF must be in the range of 0.5≦CD/EF≦4, preferably 0.8≦CD/EF≦3.
is within the range of Also, the line segment CD and the outer circumference of the four-lobed cross section B
The length ratio with the line segment GH connecting the center points G and H of the two arcs formed by the component is preferably in the range of 0.5≦CD/GH≦4, more preferably 0.8
The range is ≦CD/GH≦3. When CD/EF < 0.5 and CD/GH < 0.5, the boundary line between A component and B component is long, so even if B component is dissolved and removed, each A component sticks to each other, making it appear as if two A components are one. Because it behaves like a filament, the resulting fabric tends to have a rough and hard texture. On the other hand, when CD/EF > 4 and CD/GH > 4, either or both of the two A components are
Since DE and DF are too long compared to the straight line GH, B
The oblique planes of the filaments constituting the fabric after component removal are mirror-reflected, which tends to cause uneven gloss as a whole, making it difficult to obtain a fabric of good quality. In the cross section of the two-component composite yarn in the present invention, the shape of the A component will be explained using the A component having the apex C constituting the two-component composite yarn in FIG. 6. To obtain a fabric with silk-like luster and texture, the length ratio LM/OP of line segment LM and line segment OP is 1.05≦LM/OP≦7.15.
The range is preferably 1.1≦LM/OP≦5.0, and the range of 1.1≦LM/OP≦5.0 is more preferable. Here, line segment LM is line segment CD
Among the straight lines that intersect with A, it is the longest line segment that connects any two points on the outer circumference of component A and is parallel to line segment EF, and line segment OP has apex C and apex C.
This is a line segment parallel to EF passing through the midpoint N of the line segment CK between the boundary line between the component and the B component and the intersection K of the line segment CD.
The shape of the periphery including point L and point M in the shape of component A is preferably rounded without sharp corners, as illustrated in FIG. 6, because mild gloss can be easily obtained. In addition, A component, B component and A component in the present invention
The shape of the interface between the component and the B component is not limited to the shape described above. The type of polyester forming component A of the composite yarn in the present invention is aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, phthalic acid, and naphthalene-2,6-dicarboxylic acid, or aliphatic dicarboxylic acids such as adipic acid and sebacic acid. Acids or esters thereof, ethylene glycol, diethylene glycol, 1,4-butanediol,
Neopentyl glycol, cyclohexane-1,
It is a polyester synthesized from diol compounds such as 4-dimethanol, and especially the 80
Polyesters in which mol % or more are ethylene terephthalate units are preferred. Further, polyalkylene glycol, glycerin, pentaerythritol, methoxypolyalkylene glycol, bisphenol A, sulfoisophthalic acid, etc. may be added to or copolymerized with the above polyester component. The polyamide polymers forming component A of the composite yarn in the present invention include nylon 6, nylon 66, nylon 4, nylon 5, nylon 10, nylon 11,
It means nylon 12, nylon 6-10, polyamide having an aromatic ring, polyamide having an aliphatic ring, polyamide having a heterocyclic ring, polyamide having a hetero atom, copolymerized nylon, etc. Nylon 6 and nylon 66 are particularly preferred. Can be used. The polymer forming the B component of the two-component composite yarn in the present invention must have a different solubility in a solvent from the polymer forming the A component, and must have a high solubility. When polyester and component B are polyamide, if the solvent is an acid, only the polyamide will be dissolved; conversely, if the A component is polyamide and the B component is polyester, if the solvent is an alkaline aqueous solution, only the polyester will be dissolved. receive. In this way, the B component of the two-component composite yarn can be selected from various combinations with the A component, but from the viewpoint of dissolution and removal treatment, it is preferable to use an alkaline aqueous solution as a solvent from the viewpoint of ease of operation, safety, and cost. It is preferred that the treatment used is
From this point of view, a polymer with high alkali solubility is preferred as component B. Examples of alkali-soluble polymers include copolymers or blends of polyester and polyalkylene glycol, polyesters containing anionic surfactants, and polyesters containing metal sulfonate groups. The polymer forming component B is particularly preferably a polyester copolymerized with a metal sulfonate-containing ester unit, since the composite yarn can be stably spun and can be dissolved and removed more easily and evenly than the composite yarn. Polyester copolymerized with metal sulfonate-containing ester units is

[Formula] Constituent unit It is something that contains

[Formula] is a metal sulfonate salt of a divalent arylene group or a metal sulfonate salt of a divalent alkylene group such that -X- is separated from the -SO ₃ M group by at least three atoms; Also -X- is

[Formula] -O-(CH ₂ ) _o [O(CH ₂ ) _o ] _n -O - and

[Formula] is a divalent group selected from the group consisting of, and -Y- is -X-
or hydrogen. The metal sulfonate is preferably introduced by replacing one hydrogen of the acid component forming the polyester. Note that n and m are integers, n is greater than 1, and M is a metal. Preferred classes of main components of these polyesters are terephthalic acid or its ester-forming derivatives and polymethylene glycols having the formula HO(CH ₂ ) _p OH (where p is 2 to 2).
polyethylene terephthalate is preferred. Polyesters containing sulfonate metal salt derivatives contain approximately 10
It is also possible to contain up to mol % of glycols or other esters or oxycarboxylic acids. Examples of compounds that can be contained include isophthalic acid, phthalic acid, and naphthalene as acid components.
These include aromatic dicarboxylic acids such as 2,6-dicarboxylic acid and aliphatic dicarboxylic acids such as adipic acid and sebacic acid, and diols such as diethylene glycol, 1,4-butanediol, neopentyl glycol, and cyclohexane-1,4-dicarboxylic acid. Examples include methanol. Among polyesters containing metal sulfonates, a particularly preferred polymer is ethylene 5-sodium sulfoisophthalate, and is a polyester containing ethylene terephthalate in an amount of 70 mol% or more. The content of ethylene 5-sodium sulfoisophthalate units is preferably 2.4 mol% or more, preferably 20 mol% or more, and more preferably 10 mol% or less in order to stably spin and draw the composite yarn. The reason why a polyester in which 2.4 mol % or more of the polymer forming component B is composed of metal sulfonate-containing ester units is preferable is as follows. The higher the solubility of component B in the alkali treatment, which forms the composite yarn, the better.The higher the amount of metal sulfonate contained in component B, the faster the dissolution time of component B becomes.
The dissolution time becomes rapidly short after reaching 2.4 mol %. Therefore, from the viewpoint of dissolution rate, component B is preferably a polyester polymer containing 2.4 mol % or more of metal sulfonate-containing ester units. In the case of polyester polymers containing metal sulfonate-containing ester units in which component B is less than 2.4 mol%, in addition to the low production efficiency as described above,
If the component is polyester, the dissolution time of component B will take a long time, so the dissolution of component A will also progress, and fine irregularities will be formed on the filament surface of component A, reducing the gloss and making it impossible to obtain a silk-like gloss. Therefore, it is undesirable. In addition, the polymers forming component A and component B may contain matting agents, antioxidants,
It is also possible to include well-known additives such as fluorescent brighteners, flame retardants, and ultraviolet absorbers. The ratio of component A and component B forming the composite yarn in the present invention, that is, the composite ratio is 60/40≦ by weight.
A range of A/B≦98/2 is preferable, and 70/30≦A/
The range of B≦95/5 is more preferable. Composite ratio is A/
When B < 60/40, it is possible to make the A component finer in denier, but after the B component is eluted and removed, the fabric has a large porosity between the A components, which tends to give it a rough and loose texture. . Composite ratio is A/B>
In 98/2, the weight loss rate of the B component is small, so the porosity between the A components is small, and the texture tends to be rough and hard.
Furthermore, when applying to the warp yarn of water jet loom, it is preferable that the single yarn denier of the composite yarn is large, so when trying to make the single yarn denier of component A finer, the single yarn denier of the composite yarn will also become smaller. Undesirable. The fineness of each A component forming the two-component composite yarn must be 2.5 denier or less.
With means other than those disclosed in the present invention, it is not possible to stably weave a fabric made of warp yarns with irregular cross-section yarns of 2.5 denier or less without twisting or sizing.
The effects of the present invention become noticeable when the fineness of the T-shaped component A is set to 2.5 denier or less.
In addition, when using the composite yarn of the present invention as a warp yarn in non-twisted, glue-free weaving of a water jet loom,
The single yarn denier of the composite yarn is preferably 2.5 denier or more from the viewpoint of wear resistance. The degree of entanglement of the interlace yarn using the composite yarn of the present invention is preferably 10 threads/m or more, and more preferably 20 threads/m or more, as measured by the measuring method described later. The higher the abrasion resistance of the interlace yarn using the composite yarn of the present invention, the more effective it is in improving weaving properties.The abrasion resistance is preferably 2000 times or more, more preferably 2500 times or more, as measured by the measurement method described below. More preferably 3000 times or more. The interlace yarn using the composite yarn of the present invention is preferably used as a warp yarn for weaving without twisting or sizing, and is particularly suitable for water jet looms. Next, an example of a die device for manufacturing composite yarn according to the present invention will be described with reference to the drawings. FIG. 7 is a cross-sectional view of a cap device that can be preferably used when manufacturing a composite yarn having the cross-sectional shape shown in FIG. 1, and is made up of an upper plate 1 and a lower plate 2. In the figure, A is the A component, B is the B component, and B is the opening 3 of the upper plate 1,
The liquid A flows through the upper plate discharge hole 4 and into the opening 8 of the lower plate 2, while the liquid A flows from the liquid reservoir 5 between the upper plate 1 and the lower plate 2 through the groove 7 provided in the protrusion 6. It flows into the opening 8 of the lower plate 2. Here, the upper plate discharge hole 4 has a shape as shown in FIG. 8, and the grooves 7 have a shape of two concentric circular flat parts as shown in FIG. . The A component flowing into the opening 8 of the lower plate 2 is divided into two by the B component, and the cross section of the composite yarn discharged from the lower plate discharge hole 9 having a four-lobed shape as shown in FIG. The shape will be as shown in Figure 1. Composite yarns having cross-sectional shapes of the present invention shown in FIGS. 2, 3, 4 or other shapes can be easily manufactured by appropriately changing the shapes of the upper plate discharge hole 4, the groove 7, the lower plate discharge hole 9, etc. You will understand what you are getting. As explained above, the two-component composite yarn of the present invention is different from split yarns obtained from conventional split-type composite yarns having a cross section of one-third circular shape or one-quarter circular shape.
Since T-shaped cross-section yarns can be obtained in a reasonable manner, even more silk-like luster and texture can be imparted to the fabric. Furthermore, whereas ordinary T-shaped cross-sectional yarn can be spun through a T-shaped discharge hole, spinning can be done with half the number of discharge holes to obtain the same number of filaments, and the B component can be removed. The single filament denier before this process is a little more than twice the size of the target filament made of component A. For this reason, the spinning property
It has excellent weavability, and is particularly suitable as a raw yarn for warp yarns for water jet loom non-twist and glue-free weaving with a single yarn denier of 2.5 deniers or less of T-shaped cross-section yarns, which have traditionally been considered difficult. The present invention will be specifically explained below with reference to Examples. Here, the definitions and measurement methods of abrasion resistance and degree of entanglement are as follows. (Abrasion Resistance) The measuring method will be explained with reference to FIG. 11, which is a schematic plan view of a measuring device (a yarn friction binding force tester manufactured by Toyo Seiki Seisakusho). This device has left and right vibration tables 17 to 22 on the left side.
At the top, thread fixing terminals 11 and 1 are installed as shown in the figure.
6. Rotation guides 12 to 15 are installed. The vibration tables 17, 19, and 21 move simultaneously in the same direction,
The vibrating tables 18, 20, 22 can be moved simultaneously in opposite directions. The moving distance is 3cm on each side.
It is. There is a thread path regulation rotation guide 23 in the center. In the part that becomes the thread path on the right side, there are free rotating bodies 24 to 28 with grooves, and the free rotating bodies are connected to the support body 29.
Load 30 (0.2g/thread per thread) in the right direction through
d). Sample yarn 10
Tie one end to the thread fixed end 11 and pass the thread through to the other thread fixed end 16 as shown in the figure. However, in the twisting section 31, the yarn is twisted 2.5 times, and the twisting section angle θ is 45 degrees. After setting in this condition, move the vibrating table at a speed of 100 times per minute to squeeze the string. Measure the number of strokes until the thread breaks, and use the average value of the 10 measurements as the measured value. (Degree of entanglement) The measurement method will be explained with reference to FIG. The thread 34 to be measured is hung on the grooved pulley 33 supported by the shaft 32 as shown in the figure, and the same initial load 35 is applied to both ends of the thread.
Multiply by 36. Here, the initial load is the total denier of the yarn x 0.4g. Next, the total filament constituting the fixed cotton needle 38 of an appropriate thickness is inserted approximately midway between the thread separation point of the pulley and the load locking portion, and the cotton needle 38 is inserted between the filaments that are divided into approximately two equal parts. Single yarn denier × 2 to the initial load 35 on the opposite side
Add a constant load 37 of g. The applied constant load 37 causes the yarn to move to the left until the cotton needle 38 catches on the interlaced portion and stops. Next, remove the constant load 37 attached to the initial load 35 and
The thread is moved to the right by the constant load 37, and the intertwined part is caught on the needle 38 and stopped naturally. The moving length l (cm) of the yarn at this time is determined, and the degree of entanglement is determined using the following formula. Degree of confounding = 100/l 50 randomly selected samples were measured in the same way and the average value is shown. Example 1 Nylon 6 with a sulfuric acid viscosity of 2.4 as the A component, and ethylene 5-sodium sulfoisophthalate (2.4 mol%)/ethylene terephthalate (97.6 mol%) with an intrinsic viscosity of 0.54 in orthochlorophenol at 25°C as the B component. Polymerized polyester from 7th to 10th
Using the spinneret shown in the figure, composite spinning was carried out at a spinning temperature of 280° C. and a spinning speed of 1200 m/min to obtain a two-component composite yarn having a four-lobed cross section as shown in FIG. This two-component composite yarn has a CD/EF of 1.48,
CD/GH was 1.43, and component A accounted for 80% by weight. Continue stretching speed 800m/
min, stretching speed of 85℃, stretching ratio of 3.3 times,
Next, fluid entanglement treatment was performed at a relaxation rate of 0.3% and a compressed air of 3.5 kg/cm ² (G). As the fluid entanglement nozzle, a nozzle similar to the nozzle described in Japanese Patent Publication No. 12230/1983 was used. The obtained interlaced yarn consisting of a four-lobed cross-section composite yarn has a 50 denier 18 filament, abrasion resistance of 3200 cycles, and an entanglement degree of 35 threads/m.
It was hot. This interlaced yarn is warped without twisting or sizing, and the interlaced yarn is used as a weft yarn in a water jet loom at a warp yarn density.
Plain weave taffeta was woven with a weft yarn density of 110 yarns/inch and 90 yarns/inch. Warp thread breakage during weaving is 0.03
The number of times/10 ⁶ m was small and good. The obtained fabric was treated with an alkali using 30 g of NaOH/aqueous solution at 100°C for 40 minutes to completely dissolve and remove component B.
It went through the normal nylon 6 dyeing process. The obtained fabric had an extremely elegant luster and a silk-like texture, and was a good product with no fabric defects. Example 2 In orthochlorophenol at 25°C as component A,
Polyethylene terphthalate with intrinsic viscosity 0.65, B
Using ethylene 5-sodium sulfoisophthalate (5 mol%)/ethylene terephthalate (95 mol%) copolyester having an intrinsic viscosity of 0.50 in orthochlorophenol at 25°C as a component, the seventh
~Using the nozzle device shown in Fig. 9 and the ejection holes shown in Fig. 10 with different ejection hole shapes, the number of ejection holes was 18, the spinning temperature was 290°C, the spinning speed was 1200 m/min, and A
Composite spinning was carried out at a ratio of the components to the total of 85% to obtain bicomponent composite yarns having a four-lobed cross-sectional shape and having CD/EF and CD/GH of levels No. 1 to No. 6 shown in Table 1. Continue to increase the relaxation rate in fluid entanglement processing to 0.6%
Stretching and fluid entanglement treatment were carried out under the same conditions as in Example 1, except for the following. The obtained interlace yarn consisting of a four-lobed cross-sectional composite yarn was 50 denier and 18 filaments, and the degree of entanglement was in the range of 40 to 50 threads/m. As shown in Table 1, all of the interlaced yarns had excellent abrasion resistance. Interlace yarns of levels No. 1 to No. 6 obtained by the present invention are warped without twisting and sizing, and ordinary polyethylene terephthalate 50 denier 24 filaments are used as weft yarns in a waterjet loom at warp yarn density. Plain weave taffeta was woven with a weft yarn density of 110 yarns/inch and 90 yarns/inch. As shown in Table 1, warp thread breakage during weaving was small and good. The obtained fabric was treated with an alkali in the same manner as in Example 1 to completely dissolve and remove component B, and then passed through the usual polyethylene terephthalate dyeing process. Table 1 shows the gloss and texture of the obtained fabric.

[Table] Levels 1 to 6 all had the characteristics of silk fabrics in terms of gloss and texture, and Levels 3 and 4 in particular were products with an elegant and luxurious feel. Comparative Example Using the polymer of component A used in Example 2, spinning was carried out at a spinning temperature of 290° C., a spinning speed of 1200 m/min, and a spinneret device having a T-shaped discharge hole. In order to obtain the same degree of entanglement of the undrawn yarn as in Example 2, compressed air was applied at 3 kg/cm ² (G).
Stretching and fluid entanglement treatment were carried out under the same conditions as in Example 2, except for the following. The obtained trilobal cross-sectional interlace yarn consisting only of the A component polymer has a 50 denier 36
It was a filament, an interlaced yarn with a degree of entanglement of 45 threads/m and an abrasion resistance of 1400 cycles. The interlaced yarn was warped without twisting and sizing, and woven in a water jet loom under the same conditions as in Example 2. The number of warp yarn breakages during weaving was as high as 4.5 times/10 ⁶ m, making the yarn unsuitable for use as a non-twisted, non-sizing warp yarn for water jet looms.

[Brief explanation of drawings]

1, 2, 3, and 4 are preferred examples of the cross-sectional shape of the two-component composite yarn in the present invention,
FIG. 5 shows the cross-sectional shape of a yarn that can be obtained from the composite yarn shown in FIG. 1, and FIG. 6 is a schematic diagram for explaining the cross-sectional shape of the composite yarn in the present invention. FIG. 7 is a cross-sectional view of a die device that can be preferably used when producing the two-component composite yarn of the present invention, and FIGS. 8 and 9 are views of the upper plate discharge hole of the die device shown in FIG. 7, respectively. It shows the shape and the shape of the groove for inflowing component A provided in the upper part of the lower plate, and Fig. 10 shows the shape of the discharge hole for the two-component composite yarn provided in the lower part of the lower plate of the mouthpiece device of Fig. 7. FIG. 11 is a schematic diagram of an abrasion resistance measuring device, and FIG. 12 is a schematic diagram of an entanglement degree measuring device. 1... Upper plate, 2... Lower plate, 3, 8... Opening,
4...Upper plate discharge hole, 5...Liquid reservoir, 6...Protrusion, 7...Groove, 9...Lower plate discharge hole, A...A component, B...B component.

Claims (1)

[Claims] 1. In a composite yarn having a four-lobed cross section in which the A component is divided into two B components, each of the divided A components in the cross section is located at the opposite apex of the four-lobed shape. A line segment that is T-shaped, including C and D, and has a denier of 2.5 or less, and connects other vertices E and F.
The ratio of the length of line segment CD to EF is 0.5 to 4,
The polymer forming component A is polyester or polyamide, and the polymer forming component B is composed of a two-component composite yarn, which is a polymer that is more soluble in solvents than the polymer forming component A,
A two-component composite yarn for use in warp yarns for non-twisted and non-sizing weaving, which is interlaced and has an abrasion resistance of 2000 cycles or more. 2. The two-component composite yarn for untwisted, glueless woven warp yarn according to claim 1, wherein the polymer forming component B is a polyester copolymerized with a metal sulfonate-containing ester unit. 3. The two-component composite for non-twisted, glue-free woven warp yarns according to claim 2, wherein the copolymerized polyester polymer forming component B is polyethylene terephthalate copolymerized with ethylene 5-sodium sulfoisophthalate. thread.