JPH0280615A - Conjugated yarn and production thereof - Google Patents

Abstract

PURPOSE:To obtain conjugated yarn having cotton or flax-like feeling wherein a mixture of a saponified ethylene vinyl acetate copolymer and a crystalline thermoplastic resin and a crystalline thermoplastic resin are made into conjugated yarn of a core-sheath type comprising the former as the sheath or parallel bond type of both the components. CONSTITUTION:(A) A mixture prepared by blending (a) a saponified ethylene vinyl acetate copolymer having 30-70mol% ethylene content and >=95% saponification degree with (b) a crystalline thermoplastic resin having >=150 deg.C melting point in the weight ratio of (5:95)-(95:5) and (B) a crystalline thermoplastic resin having >=150 deg.C melting point in the weight ratio of (20:80)-(80:20) are processed into conjugated yarn of a core-sheath type comprising the former (A) as the sheath component and the latter (B) as the core component or of parallel bond type of both the components (A) and (B). The resin (b) and the resin (B) may be the same or different and are preferably polyester or nylon.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is characterized by having a good texture similar to natural fibers such as cotton and hemp, and a good feel not found in older synthetic fibers, and furthermore, excellent hydrophilic properties. The present invention relates to a composite fiber that has been imparted with properties and a method for producing the same.

(Prior art) Conventionally, synthetic fibers such as polyester and polyamide filament fibers have a thick single filament fineness and a simple cross-sectional shape, so compared to natural fibers such as silk, cotton, and hemp. The texture and luster were monotonous, and the plastic material made it feel cold and of low quality.

Recently, various attempts have been made to improve these drawbacks, such as modifying the fiber cross section, crimping, composite fibers, etc., but the current situation is that the objectives have not yet been fully achieved. For example, JP-A-56-165015, JP-A-57-59
No. 21, JP-A-58-98425, JP-A-61-23
A composite fiber of 8-soluble polymer and polyester, such as shown in No. 90'1O, is formed, and then post-processed to give the woven or knitted fabric a creaky texture and a unique luster. , or JP-A-51-207, JP-A-58-0711, JP-A-62-133118
A method of improving the texture by adding unevenness to the length of the fibers as shown in the Japanese Patent Publication No. 53-356.
33, Japanese Patent Publication No. 56-16231, etc., there is a method of fibrillating synthetic fibers to improve the texture, and a method of improving the texture by fibrillating synthetic fibers, as shown in Japanese Patent Publication No. 45-18072, especially false-twisted fused yarn. Various methods have been proposed, including a method of creating a hemp-like crisp feel by creating a linen-like texture, and a method of creating a mixed fiber fused yarn as in JP-A No. 63-6123.

However, it has not been sufficient to impart a texture similar to natural fibers to synthetic fibers, and in particular, it has been insufficient to impart textures similar to natural hemp fibers or natural cotton fibers. In addition, synthetic fibers such as polyester have insufficient hydrophilic properties, so they are inferior to cotton in terms of comfort.

(Problems to be Solved by the Invention) The present inventors have simultaneously achieved unprecedented good hydrophilicity for synthetic fibers such as polyester, as well as a texture similar to that of natural hemp fibers and natural cotton fibers. The present invention was achieved as a result of intensive studies aimed at providing a fiber-forming process such as spinning and drawing that would also have good properties. That is, the present invention has been made to find out what materials should be used and what configurations and conditions should be used in order to obtain the above-mentioned target fibers.

(Means for Solving the Problems) The present invention provides a saponified ethylene-vinyl acetate copolymer with an ethylene content of 30 to 70 mol% and a degree of saponification of 95% or more, which has excellent hydrophilicity and can be used in subsequent steps. A major feature is that a polymer that maintains physical properties suitable for imparting micro-adhesive properties to fibers randomly through heat treatment is used. In other words, the above ethylene vinyl alcohol copolymer 4 (hereinafter abbreviated as polymer A) and the crystalline thermoplastic resin (B) having a melting point of 150° C. or higher are mixed under conditions that maintain a non-uniform mixing state to some extent. A mixed polymer of two-component polymers and a crystalline thermoplastic resin (C) having a melting point of 150°C or higher, the weight ratio of which is 20 = 80 to 80:2
in the range of 0, the two-component mixed polymer forms a sheath component,
The crystalline thermoplastic resin (C) forms a core component in a core-sheath type composite cross section, or the two-component mixed polymer and the thermoplastic resin (C) form a parallel bonded structure to create a composite. After spinning and fiberizing, the fiber becomes a composite fiber and its M-spreading method, and the composite fiber can be partially stuck randomly between single fibers in a post-processing process. It is a composite fiber with greatly improved properties.

That is, in general, in the processing process of textiles, etc., after weaving, desizing treatment is performed in warm water, and then relaxing treatment (for example,
8℃ boiling treatment), then preset treatment (e.g. 170℃
-180℃ dry heat treatment), post dyeing treatment (e.g. high temperature and high pressure dyeing at 130℃ for polyester), and finally final set (e.g. 180-170℃ dry heat treatment). The fiber of the invention is A
A major feature is that by utilizing the physical properties of the polymer and post-processing steps such as those mentioned above, it is possible to obtain a random adhesion state between nine single fibers depending on the purpose, and the temperature of each treatment step can be adjusted depending on the purpose. It is characterized by the fact that by changing the conditions, fabrics with various good textures can be obtained.

The crystalline thermoplastic resin (B) having a melting point of 150°C or higher (hereinafter abbreviated as B polymer) in the present invention is:

Any polymer having a melting point of 150° C. or higher and good fiber-forming properties may be used. Preferably, it is a polyester containing polyethylene terephthalate or polybutylene terephthalate as a main component, or a polyamide containing nylon 6 or nylon 66 as a main component.

Examples of the polyester include terephthalic acid, isophthalic acid, naphthalene 2,6-dicarboxylic acid, phthalic acid, α,β-(4-carboxyphenol)ethane,
Aromatic dicarboxylic acids such as , 4-dicarboxydiphenyl, 5-natri9musulfoiphthalic acid or aliphatic dicarboxylic acids such as adipic acid and cepacic acid, or esters thereof, ethylene glycol, diethylene glycol% 1.4~'tanediol, neopentyl glycol, cyclohexane-1,4-dimetatool,
A fiber-forming polyester synthesized from a diol compound such as polyethylene glycol or polytetramethylene glycol, and a polyester in which 80 moles or more, especially 90 moles or more of the constituent units are polyethylene terephthalate units or polybutylene terephthalate units. is preferred. In addition, polyester contains small amounts of additives,
It may also contain a fluorescent whitening agent, a stabilizer, or an ultraviolet absorber.

In addition, as polyamide, nylon 6, nylon 66
It is also possible to use a polyamide containing a small amount of a third component as a main component. These may also contain small amounts of six additives, fluorescent brighteners, stabilizers, and the like.

Crystalline thermoplastic resin (C) with a melting point of 150°C or higher (hereinafter referred to as C
Any polymer may be used as long as it has a melting point of 150° C. or higher and has good fiber-forming properties. Since the C polymer plays an important role in maintaining good processability during the fiberization of the fibers of the present invention, polymers with poor spinnability are basically inappropriate for the purpose of the present invention. be. Preferably, it is a polyester whose main component is polyethylene terephthalate or polybutylene terephthalate, or a polyamide whose main component is nylon 6 or nylon 6.6.

These polyesters or polyands include the above-mentioned B
Those mentioned under polymers can be used similarly.

The B polymer and the C polymer may be the same polymer or may be different. For example, the combination of B polymer and C polymer may be polyethylene terephthalate and nylon 6, polyethylene terephthalate and nylon 6, or nylon 6 and polyethylene terephthalate. However, if the composite cross-sectional shape is a parallel laminated structure, if the types of polymer B and polymer C are different, problems such as peeling in the post-processing step are likely to occur, so it is preferable to use a combination of the same types of polymers.

Specific examples of the cross-sectional shapes of the composite fibers of the present invention as composite forms are explained with figures: core-sheath type composite fibers as shown in Figure 1, cores with irregularly shaped core components as shown in Figures 2 and 3. Sheath type conjugate fiber, multi-core sheath type conjugate fiber as shown in Figs. 4 and 5, No. 6
Eccentric core-sheath type composite fibers as shown in the figure, irregular cross-section core-sheath composite fibers as shown in Figures 7 and 11, side-by-side composite fibers as shown in Figures 8 to 9, and multilayer bonded composite fibers as shown in Figure 1O. These include fibers, composite fibers of a modified type with multi-layered laminates as shown in FIG. Component (a) in FIGS. 1 to 12 is a mixed component of polymer A and polymer B, and component (b) is a polymer component C. It is desirable that about 40% or more of the fiber cross-sectional area be occupied by a mixed polymer component of polymer A and polymer B, and if it is about 40% or less, the fiber has a good hand and good hydrophilicity as the object of the present invention. is not preferable because it is difficult to obtain.

The saponified ethylene vinyl acetate copolymer (A polymer) has a high degree of saponification of 95% or more, and has an ethylene content of 30 to 70 moles - 04, that is, a vinyl alcohol component of 30 to 70 moles. − is optimal. If the vinyl alcohol component content in the A polymer decreases, naturally the hydrophilicity, which is an important element of the present invention, decreases due to the decrease in hydroxyl groups (OH), and as will be described in detail later, the natural fiber fabric It is no longer possible to obtain the soft feel and bulky pot feeling that is seen in , and the texture becomes undesirable. In addition, if the vinyl alcohol content is high,
It is not preferable that the melt moldability deteriorates, and that the spinnability becomes poor when the fiber is formed after being mixed with the B polymer immediately before spinning, and that single fiber breakage and yarn breakage occur frequently. Also, it is not suitable because the heat resistance at 250° C. or higher, which is the spinning temperature when the B polymer is polyester or the like, is insufficient. A particularly serious problem that occurs is that a large amount of polymer accumulates on the walls of the heated molten polymer pipe, and carbonization progresses gradually during long-term spinning operations, resulting in clogging of the spinning filter, poor spinning properties, etc. At the same time as this problem occurs, the stretchability rapidly decreases, which is not preferable. Therefore, it can be said that a highly saponified ethylene vinyl alcohol copolymer containing 30 to 70 moles of ethylene vinyl alcohol copolymer is suitable for obtaining the desired fiber.

If the polymerization degree of the A polymer to be used is too low, the difference in elution viscosity from the B polymer during spinning will be large, the balance of the unbalanced and mixed polymers will be poor, and the spinnability will deteriorate, which is undesirable. From the viewpoint of spinnability, the melt index under a load of 2160 ii' at 190° C. according to JIS-6730-1977 is preferably 20 or less.

What is important in obtaining the fiber of the present invention is that polymer A and polymer B
The purpose is to form a portion of a composite fiber while maintaining a mixed form in which two component polymers are mixed in a non-uniform state to the extent that the aggregated state of the two component polymers remains. Since the A polymer is made into fibers with part of it exposed to the fiber surface layer, adhesion occurs randomly between single fibers in the fiber length direction, resulting in a natural shari similar to natural hemp fibers. This is the main reason why people feel the same way.

This is attributable to the basic polymer physical properties of Polymer A used in the present invention. Polymer A has a melting point of 15
Polymers with temperatures around 0.about.170.degree. C. actually experience a phenomenon of lowering of their melting point in hot water, and become susceptible to softening even below 150.degree. Therefore, for example, when polyester is used as the B polymer and the C polymer, the A polymer easily softens under the normal dyeing conditions of polyester fiber fabrics, the setting temperature of the fabric, etc. When a polymer aggregate is formed, a softening phenomenon occurs, leading to a sticking phenomenon between single fibers. In addition, in the case of polyester fabrics, when further alkali weight loss treatment is performed, this sticking phenomenon occurs more prominently because the fiber surface layer is rich in A polymer after the alkali weight loss treatment. That's why.

However, in the fibers of the present invention, since the aggregation state of the A polymer is not a very large aggregation unit, the degree of agglutination occurs to an appropriate degree, and the fibers maintain just a good texture without becoming too loose. be. By variously changing the dyeing temperature conditions and the 7-signal setting conditions of the fabric,
Another feature of the fibers of the present invention is that the texture can be well controlled.

Further, Polymer A starts to soften with the residence time in high-temperature hot water, but as a step before starting to soften, it swells with water and expands in volume. In the process, in the case of a woven fabric with grooves, the warp and weft yarns create woven waves in the thickness direction, which essentially causes the fabric to bulk up, giving it a fuller effect. This also explains the m of the present invention.
This is thought to be the reason why textiles made from synthetic fibers have a fullness and resilience that are not found in conventional synthetic fibers. Moreover, A
Hydrophilic property, which is another major feature of polymers, is added to the fabric, and a fabric with good hydrophilic properties comparable to so-called natural cotton fibers can be obtained.

In other words, it can be said that the fiber of the present invention was made possible for the first time by selecting a specific ethylene vinyl alcohol.

It goes without saying that in the present invention, similar effects can be expected with not only long fibers but also short fibers as long as the fibers of the present invention are used.

Furthermore, the present invention is capable of forming fibers into shapes similar to pentagons and hexagons through high-order processing such as false twisting and crimp processing, and into 93-lobed, T-shaped, and 4-lobed shapes by using irregular cross-section nozzles during spinning. , 5-lobed, 6-lobed, 7-lobed, 8-lobed, and other multi-lobed shapes and various cross-sectional shapes.
It is possible to obtain fibers according to the present invention that maintain good hand feel and good hydrophilicity.

Next, an example of manufacturing the composite fiber of the present invention will be explained. In order to obtain the conjugate fiber of the present invention, during spinning, a part of the conjugate fiber is formed while maintaining a uniform mixed state in which the two component polymers of polymer A and polymer B have their respective polymer aggregation states. It is important to
An example of the spinning method is shown in FIG. 13. FIG. 13 shows, as an example, a mixing spinneret device for producing a core-sheath composite yarn. The A polymer, B polymer, and C polymer melt flows extruded from separate melt extruders are separately weighed by a predetermined amount by a weighing machine, and then transferred to the introduction hole 2 of the introduction plate 5.
, 3 and 4, respectively, and mixing rate 6
．． Polymer A and polymer B are mixed under predetermined conditions in the nine-stop type mixers 13 and 14 provided in the sandbox 7, and the polymer C is passed through as it is, passed through the intermediate plate 8, and then filtered at the filtering parts 15 and 16 of the sandbox 9, respectively. After being filtered, filter 1
7. Current plate 10. The fiber is spun from a spinneret plate 12 through a flow divider plate 11 in which a mixed polymer of A polymer and B polymer is used as a sheath component and a C polymer is used as a core component. 1 is a case holder for the spinning pack.

It is very important here to choose the number of mixing elements of the static mixer 13, 14 appropriately. There are several types of static mixers currently in use, such as the Könicks (Ke
When using a static mixer manufactured by Nics Corporation, which divides the mixer into 2n layers by passing through n elements in which blades twisted left and right at 180° are arranged at a 90° shift, the number of elements needs to be in the range of 3 to 15. More preferably, the range of 4 to 8 is optimal. When the number of polymers is 16 or more, the mixing properties of the B polymer and the A polymer become too good, and the mixture becomes close to uniform, making it difficult to form fibers and develop the desired fiber structure in post-processing. Polymer A is present in the fiber surface layer in a partially exposed layer from among the two-component polymer mixture that is present in a non-uniformly dispersed state during post-processing, so that it sticks randomly between the single fibers, resulting in the present invention. This results in the fiber's unique crispness similar to that of natural hemp fiber.

In addition, if polyester is selected as the B polymer, the polyester and A polymer will be mixed too uniformly, and some chemical reactions will occur between the ester bonds of the polyester and the hydroxyl groups of the A polymer during melt mixing. It was found that as the process progressed, a three-dimensionally crosslinked gel product formed by the reaction between the low-molecular decomposition product of the polyester, the polyester, and the A polymer was rapidly generated, and spinning became impossible. In order to prevent the formation of gelled products, the polyester and polymer A are mixed immediately before spinning, and mixing them uniformly in a single period of time and extruding them from the spinning nozzle reduces the gelation reaction probability of the two-component polymer. It turned out to be a very effective method.

Even when polyamide is selected as the B polymer, a chemical reaction similar to that of polyester proceeds between the amide bonds of the polyamide and the hydroxyl groups of the A polymer, and a gelled product is generated, dramatically increasing the reaction probability. It is preferable not to knead by increasing the number of static mixer elements until uniform mixing is achieved.

It can be concluded that the method of the present invention has made it possible for the first time to stably produce fibers at an operational level using a mixed polymer of polyester, aluminum, and ethylene vinyl alcohol copolymer.

When using a static mixer other than Koenix 2
Needless to say, it is necessary to set the number of elements to one layer or more and use a mixer. Toshisha's Hi-Mixer, F-YAR,'
,~7do o ,x, (Charless & R
Since the Ross ISG mixer manufactured by OSS Co., Ltd. has 4n layer divisions when passing through n elements, it is preferable to set the number of elements to 2 or more and 8 or less.

It is preferable that the polymer consisting of the two components A and B, which are heterogeneously mixed in the static mixer, pass through a dividing and atomizing member such as a wire mesh, a metal nonwoven fabric filter, and a sand filter before reaching the nozzle through the static mixer. . That is, by passing the above-mentioned dividing and thinning member through the stationary mixer before reaching the nozzle, the A component is prevented from forming into a layer of large aggregate units, and the fine islands at the interface between the A component and the B component are This is because it provides uniform dispersion, stabilizes the heterogeneous mixing state of the two-component polymer, and improves spinnability.

The mixing ratio of polymer A and polymer B needs to be in the range of 5:95 to 95:5 in terms of if ratio.

For example, when polyester or polyamide is used as the B polymer, in the case of full or fibrous fibers made only of a mixed polymer of the A polymer and the B polymer, when the A polymer ratio is 40% by weight or more, the spinning process and drawing process properties are significantly affected. However, by forming a composite fiber in which polymer C is added as a composite component as a component that maintains processability as in the present invention, the ratio of polymer A can be reduced to 40.
Even if the weight percentage is higher than that, the processability is significantly improved.

Furthermore, it has been found that by adopting a composite form in which the C polymer component is not exposed to the surface layer of the slender fibers, the desired texture and hydrophilicity of the present invention can be sufficiently obtained.

If the mixing ratio of the A polymer is less than 5, the natural linen-like texture based on the polymer physical properties of the ethylene vinyl alcohol copolymer of the present invention and the hydrophilicity comparable to natural cotton will not be sufficiently manifested, which is not desirable. . Moreover, when the weight exceeds 95, the degree of adhesion between the single fibers becomes too strong.
It gives a rough texture, which is not desirable.

An independent mixed polymer component of A polymer and B polymer and C
The composite ratio of polymers is 20:80 to 1 in terms of quantity ratio.
It needs to be in the 80:20 range.

If the content of the mixed polymer component is less than 220% by weight, it is not preferable because the good texture and good hydrophilicity, which are the objectives of the present invention, will be insufficient. If the weight exceeds 80% by weight, the C polymer's ability to maintain processability such as spinnability and stretchability will be reduced, and the fiA ratio, which causes many single yarn breakages and yarn breakages, will decrease, which is not preferable.

EXAMPLES Next, the present invention will be explained in detail with reference to Examples, but the present invention is not limited thereto.

The hydrophilicity planning in the examples was carried out by dropping water droplets on the fabric and comparatively comparing the spread of the water droplets. The intrinsic viscosity of the polymer was measured using a Ubbelohde viscosity needle in a thermostat at 30° C. using a mixed solvent of equal amounts of phenol and tetrachloroethane for the polyester. Polyamide is made using orun chlorophenol.
Measured at ℃.

Example 1 A polymer with a saponification degree of 99% and an ethylene component of 4
An 8 mol% ethylene vinyl alcohol copolymer with a melt index of 6.0 was used, and the B polymer and C polymer were polyethylene terephthalate with an intrinsic viscosity of 0.70, and the A polymer, B polymer, and C polymer were melted in separate extruders. Extrusion, weight ratio of A to B is 40
/60, and the weight ratio of the mixed polymer of A polymer and B polymer and the C polymer was 50:50 after each was weighed with a gear pump and then fed to the spinning bag, and then the method shown in Fig. 13 was carried out. In the spinning bag, the A and B polymers are kneaded unevenly to some extent using a 4-element stack mixer manufactured by Koenig Co., Ltd., to the extent that the presence state of the B polymer can be seen, and then passed through a sand filter to join with the C polymer. After forming a core-sheath composite shape with the A/B mixed polymer as the sheath component and the C polymer as the core component as shown in the figure, it was discharged at a spindle temperature of 295°C and melt-spun at a winding speed of 1000 m/min. did. The obtained spun yarn was passed through a hot roller at 75°C and a hot plate 1 using an ordinary roller plate type drawing machine.
It was stretched at 20° C. and at a stretching ratio of 2.9 times to obtain a multifilament of 36 filaments of 75 denier. There were no problems with good spinnability and stretchability.

A 1/1 plain woven fabric was woven using the obtained multifilaments as warp and weft yarns. The weaving process was also particularly problematic. After the mosquito raw fabric plain fabric was treated by a conventional method, it was dyed by the following method, and then dried and finished by a conventional method.

The resulting plain woven fabric had a soft feel, a repellent window, and a good texture resembling that of natural hemp fibers with a crisp feel. The fabric also had good hydrophilicity.

When the fibers constituting the fabric were observed using a microscope and a scanning electron microscope, it was found that single fibers stuck together randomly in the length direction of the fibers, and this state existed in a discontinuous state in the length direction. I understand.

Examples 2 to 13 Fiberization was carried out in the same manner as in Example 1 under the conditions shown in Table 1, and plain woven fabrics were produced in the same manner as in Example 1. In all cases, fabrics with good processability, good hand feel, and good hydrophilicity were obtained.

Example 2 has a melt index value of A polymer of 14.0.
In Example 3.4, the heavy IIL mixing ratio of polymer A and polymer B was 10:90% and 90:1O.
And so. In Example 5.6, the tfl composite ratio of the mixed polymer of A polymer and B polymer and the C polymer was changed to 70:30 and 30:70, respectively. Examples 7-1
1 is carried out by changing the composite shape in various ways. Example 12.1
3 was carried out by changing the number of static mixer elements in the spinning pack from 8 elements to 12 elements.

Example 14 B polymer and C polymer [η] 1, 1O nylon 6
The same ethylene vinyl alcohol copolymer as in Example 1 was used as the A polymer, and the weight ratio of A to B was 2.
The ratio was 0:80, and spinning was performed at a winding speed of 600 m/min. The yarn was drawn in a conventional manner to obtain a drawn yarn of 75 denier and 24 filaments, after which a plain woven fabric was prepared, processed in a conventional manner, and dyed after intermediate setting. Staining is Kayan
The test was carried out at 98° C. for 60 minutes using 3% owf (manufactured by Nippon Kayaku Co., Ltd.; acid dye). After that, dry and finish setting by the usual method. The fabric was satisfactory.

Examples 15 to 18 Table 1 Nodotoku B Polymer C Polymer was changed and carried out. Example 15 uses polybutylene terephthalate as the B polymer and C polymer, Example 16 uses nylon 6 as the B polymer and polyethylene terephthalate as the C poly ff +, and Example 17 uses polyethylene terephthalate as the B polymer and nylon as the C polymer. 6. Example 18
used polybutylene terephthalate as the B polymer and nylon 6 as the C polymer.

In all cases, fabrics with good processability, good hand feel, and good hydrophilicity were obtained.

Example 19.20 Ethylene vinyl alcohol copolymers of Polymer A with different ethylene contents were used. Example 1
9 has an ethylene content of 32 moles and a melt index of 1.
．． 6, Example 20 has an ethylene content of 55 molt.
4.0 was used, and the other conditions were as shown in Table 1. In all cases, fabrics with good processability, good hand feel, and good hydrophilicity were obtained.

Comparative Example 1.2 The same ethylene vinyl alcohol copolymer v-(A polymer) as in Example 1 was used, polyethylene terephthalate was used as the B polymer and the C polymer, and the weight mixing ratio of the A polymer and the B polymer was 3:97. The other conditions were exactly the same as in Example 1, and the fibers were used at a ratio of 97:3. Comparative Example 1 had good cutting properties and no problems, but the texture of the fabric obtained was not very special and a desirable one could not be obtained. Furthermore, when compared with Example 2, the evaluation of hydrophilicity by wicking property was insufficient. In Comparative Example 2, the texture of the fabric was slightly poor, with a lot of B-wear, υ too much, and a strong 7-way feel.

Comparative Examples 3 and 4 The composite ratio of the mixed polymer of A polymer and B polymer and the C polymer was changed, and the other conditions were the same as in Example 1. Comparative Example 3 was carried out at a weight composite ratio of A/B mixed polymer and C polymer of 10:90, but a stable core-sheath structure was not formed during spinning, and many single fiber breakages occurred. In addition, the texture of the fabric was slightly less than desired.

Comparative Example 4 was carried out at a weight composite ratio of A/B mixed polymer and C polymer of 90:10, but single filament breakage and yarn breakage occurred frequently during spinning and drawing, and a drawn yarn with good quality that could be evaluated could not be obtained. Ta.

Comparative Example 5 z Terene content: F48 mol%, melt index: 40.0
Fiberization was carried out using the same ethylene vinyl alcohol copolymer powder under the same conditions as in Example 1 except for the following conditions. Since the melt viscosity of Polymer A was low, the balance after mixing with polyethylene terephthalate was poor, and single fiber breakage and yarn breakage occurred frequently during spinning. The stretchability and weavability were also poor.

Comparative Example 6 Ethylene content is 25 mol%, melt index 0.6
Fiberization was carried out using the ethylene vinyl alcohol copolymer (A) under the same conditions as in Example 1 except for the following. (A
) The spinnability of the polymer was poor, resulting in a very poor spinnability. Further, when spinning continues for a long time, gelled products of polymer A clog the spinning filter, and at the same time, a large amount of gelled products are mixed into the fibers, further deteriorating spinnability. Stretchability is also very poor, and #&
I couldn't get anything.

Comparative Example 7 Ethylene content was 80 mol%, melt index was 40.
Fiberization was carried out under exactly the same conditions as in Example 1, except that the ethylene vinyl alcohol copolymer (A) of No. 0 was used. Processability was somewhat poor. The texture of the obtained fabric was not very full and the repulsion was insufficient, making it unsatisfactory as a natural hemp fiber-like fabric.

Comparative Example 8 The number of stub mixer elements in the spinning pack was 20.
Elements were used, and fiberization was carried out under exactly the same conditions as in Example 1 except for the other conditions. (A) Polymer and (B) Polymer have poor cross-talk, and the hydroxyl groups of Polymer A, polyethylene terephthalate, and ester bonds react with each other in the molten mixture of the two-component polymer, and there are many gelled substances in the mixed polymer. The spinning filter was clogged in a short period of time, which was thought to be due to the formation of the spinning filter, and the spinning pack had to be replaced frequently, making continuous spinning operation impossible.

In addition, the spinning filter becomes severely clogged, and at the same time, single filament breakage occurs during spinning, fuzz occurs during drawing, and the yield decreases.
Processability was poor.

(Effects of the Invention) As described above, the present invention uses a specific ethylene vinyl alcohol copolymer and mixes it with a crystalline thermoplastic resin having a melting point of 150°C or more under predetermined conditions to obtain a specific dispersion state. By adding a predetermined post-processing method, a crystalline thermoplastic resin with a melting point L of 50°C or higher is used as one part of the composite, and a crystalline thermoplastic resin with a melting point L of 50°C or more is added as a composite fiber, which cannot be achieved with conventional synthetic fibers. A synthetic fiber has been discovered that has a good natural hemp fiber-like texture and good hydrophilicity.

[Brief explanation of the drawing]

1 to 12 are model diagrams of the composite form of the composite fiber of the present invention. (a) is a mixed polymer component of A polymer and B polymer, and (b) is a C polymer component. FIG. 13 is a sectional view showing an example of a spinneret device for composite LA fibers of the present invention, where l is a case holder for a spinning bag, 2.3.4 is a polymer introduction hole, 5 is an introduction plate, 6.7 is a mixing plate, 8 is a medium flJ5 board, 9 is a sandbox, 10 is a rectifier plate, 11 is a flow divider plate, 12 is a base plate, 13.14 is a stationary mixer. Reference numerals 15 and 16 indicate a filtering section, and 17 indicates a filter.

Claims (2)

[Claims] (1) Ethylene content 30-70 mol%, saponification degree 95
% or more of a saponified ethylene vinyl acetate copolymer (A) and a crystalline thermoplastic resin (B) having a melting point of 150°C or more are mixed in a weight ratio A:B of 5:95 to 95:5. The mixed component and the crystalline thermoplastic resin (C) having a melting point of 150° C. or higher have a core-sheath type structure in which the former mixed component is a sheath component and the latter C component is a core component, or the former mixed component and the latter C component have a core-sheath type structure. A composite fiber forming a parallel bonded structure and characterized in that the weight ratio of the former component and the latter component is 20:80 to 80:20. (2) Ethylene content 30-70 mol%, saponification degree 95
% or more of a saponified ethylene vinyl acetate copolymer (A), a crystalline thermoplastic resin (B) with a melting point of 150°C or more, and a crystalline thermoplastic resin (C) with a melting point of 150°C or more are separately melted. After extrusion and introduction into the spinning pack, the weight ratio of A:B is adjusted to 5:95-95: before reaching the spinning nozzle.
5 in a static mixer to the extent that some degree of non-uniformity remains, and then the mixed polymer melt flow of the A polymer and B polymer and the C polymer melt flow are mixed at a weight ratio of 20: In the range of 80 to 80:20, the former polymer melt flow is formed as a sheath component and the C polymer melt flow is formed as a core component to form a core-sheath type composite cross section, or the former polymer melt flow and C polymer melt flow are formed in parallel. A method for producing a composite fiber, which comprises forming a composite cross section of a mold bonded structure and extruding it into fibers from a spinning nozzle.