JP7047414B2 - Crimping thread - Google Patents

Description

INDUSTRIAL APPLICABILITY The present invention is suitable for a stress-free stretch material having a comfortable bulkiness and a flexible tactile sensation and excellent motion followability in a crimped yarn in which single yarns having different crimping forms are uniformly dispersed and mixed. It is about crimped yarn.

Fibers using thermoplastic polymers such as polyester and polyamide have various excellent properties such as mechanical properties and dimensional stability, so they are used in various fields such as clothing applications, interiors, vehicle interiors, and industrial materials. Has been done. As the uses of fibers have diversified, the required characteristics have also become diversified.

In recent years, there has been a high demand for stretch materials that appeal to fit and movement followability when worn, and the development of high-performance stretch fibers that also have comfort such as texture, light weight, and bulkiness has been actively pursued. It has been. In particular, the addition of bulkiness produces excellent wearing comfort because it produces a soft touch feeling with swelling due to the fine gaps existing between the yarn bundles and excellent heat retention due to the heat insulating effect of the contained air. , It can be widely used from general clothing such as innerwear to outerwear to sports clothing.

Various methods for imparting stretch to the raw yarns constituting the fabric have been proposed so far, and the fibers are false-twisted to use fibers that express twisting / untwisting torque, or have rubber elasticity in the woven fabric. There is a method of mixing polyurethane fibers, but there are cases where the stretchability is insufficient and the dyeing process becomes complicated due to the mixing of other materials.

To solve these problems, there is a disclosure of a technique relating to a latent shrinkage-expressing yarn in which different polymers are bonded side-by-side in a side-by-side manner and a spiral structure is expressed by this shrinkage difference.

Patent Document 1 proposes a side-by-side composite yarn of polyethylene terephthalate (PET) having an intrinsic viscosity difference or an extreme viscosity difference, and Patent Document 2 proposes a latent crimp yarn such as a side-by-side composite yarn using polytrimethylene terephthalate (PTT) and PET. Has been done. In these latent crimped yarns, the single yarn forms a three-dimensional spiral structure by utilizing the difference in shrinkage rate of each polymer. The fiber is obtained.

Further, in the latent crimped yarn as described above, in order to prevent the crimping phases of the single yarns from being aligned, the crimped form is changed between the single yarns constituting the multifilament, and the single yarns become independent. Expressing crimps works effectively. In order to realize this, it is conceivable to use a latent crimped yarn or the like having a variation in the curvature of the polymer interface between single yarns, and such a technique has been proposed in Patent Documents 3 and 4.

The technique of Patent Document 3 is a technique of changing the composite ratio between single yarns to develop a variation in the curvature of the polymer interface, and the crimp phase is determined by the difference in the crimping morphology between the single yarns according to the composite ratio. There is a possibility that it can have both stretchability and bulkiness when it is shifted and made into a cloth.

Patent Document 4 proposes a bulky polyester composite fiber composed of two or more types of single yarn groups of latent crimped yarns having different degrees of deformation. Certainly, in the technique of Patent Document 4, it is possible to change the crimping form of the single yarn according to the degree of deformation of the cross section of the single yarn, and the crimping of the single yarn does not bite and the crimping is expressed in each. There is a possibility that a so-called crimp phase shift state can be achieved.

Further, unlike Patent Documents 3 and 4, Patent Document 5 is characterized in that latent crimped yarns having appropriately different crimping ratios are spun separately and then mixed during the drawing step. It is stated that a fluffy and bulging texture can be obtained.

Japanese Unexamined Patent Publication No. 2014-198917 (Claims) JP-A-2005-113369 (Claims) Japanese Unexamined Patent Publication No. 2000-21238 (Claims) JP-A-2007-247107 (Claims) JP-A-58-208418 (Claims)

In the latent crimped yarns proposed in Patent Document 1 and Patent Document 2, since all the constituent single yarns have the same composite cross section, the crimped form such as the size and pitch of the crimps naturally expressed by the single yarns. Will be the same. For this reason, when single yarns having the same crimping as a multifilament are assembled, the crimps of the same size cause biting into each other, so that the crimping phases of a plurality of yarns are aligned and the multifilament is formed. In some cases, a single spiral structure, such as twisted yarn, was formed.

In such a state where the crimping phases are aligned, the yarn bundles are bundled, and when the fabric is used, not only the stretchability but also the bulkiness, which is important for the tactile sensation of the fabric, may be significantly impaired. In addition, when the crimped yarn does not exist randomly and exists in a state where the phases are aligned, the crimped yarns are greatly shrunk in one direction with the same direction, so that there are defects such as wrinkles and streaks in the higher processing process. It is likely to occur, and it may be necessary to precisely control the temperature and tension of higher-order machining.

Further, in the technique of Patent Document 3, even if the composite ratio is changed within the above range, the change in the crimped morphology is slight. Therefore, from the viewpoint of the crimped morphology, substantially all the single yarns can be regarded as the same, and the crimped yarn It was not enough to shift the phase, and it was inferior in bulkiness when it was made into a cloth.

Further, in the technique of Patent Document 4, which has a higher effect of shifting the crimp phase than Patent Document 3, in order to make the effect of shifting the crimp phase effective, the cross section of one or more fibers is excessively deformed. In some cases, the abundance ratio of highly deformed yarns in the multifilament may be biased. Compared to normal crimped yarn, such latent crimped yarn may have excessively and partially aligned crimped phases, and the texture and surface quality of the fabric are said to be excellent. It was hard to say.

On the other hand, in the technique of Patent Document 5, since the mixed yarn is obtained by the post-blended fiber, it cannot be said that the dispersibility of the single yarns of different types in the yarn bundle is high. Due to the uneven distribution of single yarns of the same type, there are cases where parts with the same type of crimping phase are excessively and partially aligned, and it is difficult to say that the texture and surface quality of the fabric are excellent. .. Further, in Patent Document 5, if the mixed fiber entanglement processing is not sufficiently performed by interlacing or the like, the low crimped yarn will be present floating on the surface of the yarn bundle, and the surface of the fabric will have an unnecessarily rough texture. In some cases.

The present invention overcomes the problems of the prior art, precisely controls the crimped form of the single yarn constituting the crimped yarn, and controls and improves the dispersibility of the single yarn in the yarn bundle, thereby making it comfortable. It is intended to provide a fiber material having a soft surface feel due to the bulkiness and the difference in yarn length according to the crimped form.

The above task is achieved by the following means. That is,
(1) A crimped yarn characterized in that single yarns of eccentric core-sheath composite yarns satisfying the following (A) and (B) having two or more different cross-sectional forms are dispersed and mixed in a yarn bundle.
(A) The ratio S / D of the minimum thickness S of the sheath component covering the core component and the fiber diameter D of the single yarn is 0.01 to 0.10.
(B) The peripheral length portion having a thickness within 1.05 times the minimum thickness S is 30% or more of the total peripheral length of the single yarn cross section.

(2) The crimped yarn according to (1), wherein the ratio between the one having the maximum distance between the central center of gravity points between the polymers in the cross section of the single yarn in the crimped yarn and the one having the minimum distance is 1.10 times or more different.

(3) The crimped yarn according to (1) or (2), wherein all the single yarns have a degree of deformation of 1.50 or less.

(4) A textile product containing at least a part of the crimped yarn according to any one of (1) to (3).
Is.

In the crimped yarn of the present invention, single yarns having different crimping forms are dispersed and mixed in the yarn bundle, and fine interfiber voids developed by the shift of the crimping phase between the single yarns are formed in the yarn bundle. By producing woven and knitted fabrics with excellent bulkiness and flexible stretchability, it is possible to provide comfortable clothing textiles that have both a bulky and flexible surface feel and excellent motion followability without feeling stress.

It is an example of a single yarn constituting the crimped yarn of the present invention, and is a fiber cross section for explaining the position of the center of gravity in the fiber cross section. It is an example of the schematic diagram of the fiber cross section of the crimped yarn of this invention. It is a schematic diagram of an example of the distribution of the distance between the center of gravity points of the single yarn constituting the crimped yarn of this invention. It is an example of the distribution hole arrangement in the final distribution plate for obtaining the crimped yarn having the eccentric core sheath cross section of the present invention. It is an embodiment of the distribution hole arrangement in the final distribution plate for obtaining the thin skin eccentric core sheath cross section of the present invention. It is an example of the thin-skin eccentric core sheath cross section of the present invention, and is a fiber cross section for explaining the minimum thickness (S) in the fiber cross section.

Hereinafter, the present invention will be described in detail together with desirable embodiments.
The crimped yarn of the present invention requires that two or more types of single yarns of eccentric core sheath composite yarns having different cross-sectional shapes are dispersed and mixed in the yarn bundle.

The eccentric core sheath cross section referred to in the present invention includes a core component (polymer A) in which the fiber cross section of the single yarn exemplified in FIG. 1 is composed of two types of polymers and the position of the center of gravity is different from the cross section center of the single yarn. It means a cross section completely covered with a sheath component (polymer B). FIG. 1 illustrates the eccentric core sheath cross section, where horizontal hunting is the sheath component (polymer B), 30 deg hunting (upward diagonal line) is the core component (polymer A), and the center of gravity of the core component in the single thread cross section. Is the center of gravity a, and the center of the cross section of the single thread is shown as the center point c. The eccentric core-sheath composite yarn of the present invention having a cross section composed of two types of components, a core component and a sheath component, is subjected to heat treatment or the like, so that the single yarn is greatly curved according to the shrinkage difference of the core / sheath component. Three-dimensional spiral crimping like a coil is manifested, and in the present invention, it is an important requirement that two or more types of eccentric core sheath cross sections having different cross-sectional forms are mixed in the same thread bundle. Become.

The difference in the cross-sectional form referred to here means that the distance between the centers of gravity in the single yarn cross section of the eccentric core sheath composite yarn of the present invention is different, and the distance between the center of gravity points in this yarn cross section is determined as follows. Can be done.

That is, a crimped yarn composed of a plurality of single yarns is embedded with an embedding agent such as epoxy resin as a bundle of yarns, and a cross section thereof can be observed with a scanning electron microscope (SEM) or the like at a magnification of 10 or more single yarns. Take an image with. At this time, when metal dyeing is applied, the contrast between the joint portion of the core component and the sheath component can be clarified by utilizing the dyeing difference between the polymers. In each photographed image, when the center point of the circumscribed circle of the core component of the single thread is the center point a, the center point of the circumscribing circle of the single thread is the center c, and the diameter is the fiber diameter D, the center of gravity a and the center c. The value obtained by dividing the distance G between them by the fiber diameter D and rounding off to the second digit is the distance between the center of gravity (G / D) in the present invention. The diameter of the circumscribed circle of each component used when determining the distance between the center of gravity is the cross section in the direction perpendicular to the fiber axis from the image taken two-dimensionally, and two or more points on this cut surface. It means the value obtained by measuring the diameter of the most circumscribed circle in μm units and rounding off the second and lower digits.

"Two or more types of eccentric core sheath cross sections having different cross-sectional shapes coexist in the yarn bundle" in the present invention means a mode described later, and the yarn of the crimped yarn of the present invention shown in FIG. An example of a bundle cross section will be described.

FIG. 2 illustrates a state in which single yarns of two types of eccentric core sheath composite yarns having different distances between the center of gravity points are mixed in the yarn bundle. When all the single yarns are evaluated by the distance between the center of gravity points of the fiber cross section described above for the cross section of the yarn bundle as shown in FIG. 2, the distance distribution between the two center of gravity points as illustrated in FIG. 3 (3-( a) and (c)) will be taken. Here, a single yarn group having a distance between the center of gravity points within the range (distribution width) of each distribution is defined as "one type", and this distance distribution between the center of gravity points is obtained in the measurement results of all the single yarns constituting the crimped yarn. However, the presence of two or more as shown in FIG. 3 means that "two or more types of eccentric core sheath cross sections having different cross-sectional forms coexist in the yarn bundle" in the present invention. What is the distribution width of the distance between the center of gravity points referred to here? (3- (e), (f)) is the distance between the center of gravity points (3- (3), which is the peak value having the largest number of existence in each single yarn group. b) means the range of ± 5% of (d)).

When the single yarn in the yarn bundle is composed of two kinds of the same polymer, the moment for bending the single yarn changes depending on the length of the distance between the center of gravity points described above. Therefore, the degree of crimping of each single yarn, such as the outer diameter of the spiral structure of the single yarn and the number of crimped ridges per unit length, changes. In other words, this has a great influence on the tactile sensation such as bulkiness and repulsion in the yarn bundle, and further on the expansion and contraction behavior, which is an important requirement for textiles for clothing. In this regard, the present inventors have diligently studied, and two or more types of eccentric core sheath cross sections having different cross-sectional forms coexist in the yarn bundle, which is a requirement of the present invention. The crimping of the single yarn does not mesh with each other, and the single yarn independently develops a spiral structure, and by eliminating each other between the single yarn and the single yarn, it is suitable for a good stretch material with excellent bulkiness. He found that it would become a thread.

In the present invention, the difference in the crimping form between the constituent single yarns is an important requirement, which is the maximum value (Gmax) and the minimum value (Gmin) of the distance between the central center of gravity points of the single yarns constituting the yarn bundle. It can be evaluated by the ratio (Gmax / Gmin). That is, Gmax / Gmin indicates the difference in the distance between the central centers of gravity of the single yarn groups constituting the crimped yarn, and it means that the larger this value is, the larger the difference in the crimped morphology between the single yarn groups.

According to the study by the present inventors, it is possible to suppress the engagement of the crimps of adjacent single yarns due to the difference in the target crimping form, and in order to develop the bulkiness due to the crimping phase shift, Gmax / Gmin. It is important that is 1.10 times or more. Further, Gmax / Gmin is more preferably in the range of 1.60 to 4.00 times, the difference in the crimping form of each single yarn group is expanded, the yarn length difference is unprecedented, and the crimping rate is low. The single yarns are dispersed to form loose crimps, and while expressing the shadowy feeling existing on the surface of the cloth, the cloth has a comfortable and excellent tactile sensation that has never been seen before.

Further, in order to emphasize the good tactile sensation caused by the gap between the yarn bundles developed by the crimped yarn of the present invention and to express the quality of the fabric without causing a partial change in appearance, 2 It is important that the eccentric core-sheath composite yarns having different cross-sectional forms of different types are dispersed and mixed in the yarn bundle. The state of being dispersed and mixed here means that when the cross section of the yarn bundle is observed, at least one type of single yarn among the single yarn groups having different cross-sectional morphology is evenly present in the yarn bundle. This means that it can be evaluated by looking at the ratio of adjacent filament groups of at least one type of single yarn constituting the crimped yarn.

The adjacent filament group referred to in the present invention is a set of eight or more single yarns having the same cross-sectional shape that are adjacent to each other in the cross section of the crimped yarn, and the adjacent filament group ratio is the adjacent filament group. When the total number of single yarns constituting the above is Ns and the total number of single yarns of the fiber is N, it is represented by Ns / N. Further, the fact that the single yarns are adjacent to each other means that, as shown in 2- (a) and 2- (b) of FIG. There is no single yarn having the cross-sectional morphology of. Further, when eight or more of these are adjacent to each other as in the 2- (c) part, the set is defined as an adjacent filament group. Further, when a plurality of adjacent filament groups are present in the cross section of the crimped yarn, the total number of single yarns constituting them is the total number of single yarns constituting the adjacent filament group Ns.

That is, the adjacent filament group ratio referred to in the present invention is based on the result of classifying by the distance between the points of the center of gravity using the image of the cross of the center of gravity taken when determining the distance between the points of the center of gravity in the thread cross section on the yarn bundle. For 10 randomly selected images, the number of single yarns constituting the adjacent filament group is counted. From this measurement result, the adjacent filament group ratio = (number of single yarns constituting the adjacent filament group) / (total number of single yarns of interest) × 100 (%) is calculated. The value rounded off to the first decimal place of the simple number average of the measurement results of the 10 images was taken as the adjacent filament group ratio referred to in the present invention.

When two or more types of single yarns are not evenly mixed as in general post-blended yarns and the abundance ratio of certain single yarns in the yarn bundle is biased, this adjacent filament group ratio is a high value. Therefore, when heat treatment or the like is applied, crimping occurs between single yarns of the same type, and the crimping yarn, which is the object of the present invention, is out of phase and contains many voids between the yarn bundles. It may be difficult to do.

On the other hand, the present invention is characterized in that single yarns having different crimping forms are uniformly dispersed in the yarn bundle. When this yarn bundle state is evaluated by the adjacent filament group ratio, if the adjacent filament group ratio of one type of single yarn constituting the yarn bundle is 10 to 80%, the single yarns of the present invention are uniformly dispersed. Represents a state.

To promote this idea, it is preferable that the value of the adjacent filament group ratio is low, and it can be mentioned as a preferable range that the adjacent filament group ratio is 10 to 60% and the single yarn is present. Within this range, single yarns having different crimping morphologies exist around the single yarns dispersed in the yarn bundle, and the single yarns independently form a crimping structure and the single yarns. The biting of the crimped structure between the single yarns around the single yarn is suppressed, and the exclusion effect between the single yarns can be obtained. The crimped yarn whose crimping phase is shifted between the single yarns contains many voids in the yarn bundle and exhibits the stretchability which is a characteristic of the crimped yarn. Therefore, when it is made into a cloth, it is soft. It becomes a bulky stretch material with a comfortable repulsive feeling.

In order to form fine voids created by the difference in crimping morphology, which is not achieved by the conventional post-blended yarn created by the different cross-sectional morphology, which is a feature of the present invention, the yarns having different cross-sectional morphology are evenly distributed in the yarn bundle. It is preferable that they are mixed, and from this viewpoint, the degree of deformation of all the cross sections of the single yarns is preferably 1.50 or less.

The degree of deformation referred to in the present invention is a fiber diameter D corresponding to the circumscribed circle diameter of a single thread and a perfect circle inscribed in the single thread by using an image of the thread cross section taken when determining the distance between the center of gravity in the thread cross section. Using the diameter of the inscribed circle, which is the diameter of, it was calculated as the degree of deformation = fiber diameter ÷ inscribed circle diameter. The degree of deformation measured by the above method means that the closer the value is to 1.00, the closer the shape of the cross section of the single yarn is to a perfect circle.

In the case of the mixed fiber yarn, since the outer shape of the fiber is changed in a similar manner, the single yarn group having a different cross-sectional shape is kneaded in the fiber mixing step, and is well dispersed in the yarn bundle. Further, the closer the cross section of the single yarn is to a perfect circle, the easier it is for the single yarn to diffuse when a force is applied in the direction perpendicular to the fiber axis, and the better the dispersibility. It is preferable that the degree of deformation of all single yarn cross sections is 1.50 or less. When the degree of deformation of the single yarn cross section becomes smaller, the single yarn cross section becomes closer to a perfect circle, which is suitable from the viewpoint of uniform dispersion of the single yarn, which is a requirement of the present invention. In particular, when the crimped yarn of the present invention is applied to a textile for clothing, the fabric is excellent in appearance such as smoothness of the surface of the fabric and mild luster due to diffuse reflection of light. Therefore, in the present invention, it is more preferable that the degree of deformation of the single yarn cross section is 1.20 or less.

Considering the process passability in higher-order processing and the actual use when the crimped yarn of the present invention is processed and fabricated, it is preferable that the crimped yarn has a toughness of a certain level or higher, and the strength and elongation at break of the fiber are suitable. Is preferably as follows.

The strength of the present invention is a value obtained by obtaining a load-elongation curve of a fiber under the conditions shown in JIS L1013 (2010) and dividing the load value at break by the initial fineness, and the elongation is the elongation at break. Is divided by the initial trial length. Here, the initial fineness means a value obtained by calculating the weight per 10,000 m from a simple average value obtained by measuring the weight of the unit length of the fiber a plurality of times.

The strength and elongation referred to here are preferably adjusted by controlling the conditions of the manufacturing process described later according to the intended use, etc., but the standard of the crimped yarn of the present invention is that the strength is high. , 0.5 to 10.0 cN / dtex, and the elongation is 5 to 700%, which can be mentioned as a preferable range.

When the crimped yarn of the present invention is used for general clothing applications such as inner and outer, it is preferable that the strength is 1.0 to 4.0 cN / dtex and the elongation is 20 to 40%. Further, in sports clothing applications where the usage environment is harsh, it is preferable that the strength is 3.0 to 5.0 cN / dtex and the elongation is 10 to 40%.

The crimped yarn of the present invention can be made into various textile products as various intermediates such as fiber winding packages, tows, cut fibers, cotton, fiber balls, cords, piles, woven and knitted fabrics, and non-woven fabrics. Textile products here include general clothing such as jackets, skirts, pants, and underwear, sports clothing, clothing materials, interior products such as carpets, sofas, and curtains, vehicle interiors such as car seats, cosmetics, cosmetic masks, and wiping. Used for daily use such as cloth and health products, environmental and industrial materials such as polishing cloth, filters, harmful substance removal products, battery separators, and medical applications such as sutures, scaffolds, artificial blood vessels, and blood filters. Can be done.

Next, a preferred method for producing the crimped yarn of the present invention will be described.
The crimped yarn of the present invention needs to form a state in which two types of single yarns having different cross-sectional forms are dispersed and mixed. This yarn bundle form can be applied by precisely controlling the so-called post-mixed yarn in which separately produced yarns are mixed by an air nozzle or the like, but a plurality of types of single yarns can be applied to the same spinneret. It is preferable to use a spinning mixed fiber method in which the yarn is discharged from the yarn and wound at the same time. In this spinning mixed fiber method, since a plurality of types of single yarns are simultaneously focused at the time of winding, each single yarn is easily dispersed in the crimped yarn, and the discharge hole corresponding to each single yarn is formed on the spinneret. It is also possible to change the degree of dispersion in the crimped yarn by changing the quantity and arrangement. Further, in addition to being able to eliminate the post-processing step by spinning and blending fibers, in order to create the yarn bundle form required in the present invention, for example, excess air or the like is injected to replace the fiber arrangement in the entangled nozzle to mix fibers. In this process, the yarn may be scratched unnecessarily, causing single yarn breakage and the like. In particular, in the case of the present invention, the single yarns are crimped to develop stretchability in the fabric, and when such single yarn breakage occurs, the single yarns are entangled with each other on the surface of the fabric to cause pilling. In some cases. On the other hand, in the case of the spun-blended fiber preferably used in the present invention, the crimped yarn can be obtained without such a concern, so that the quality of the fabric is also excellent.

In the spinning mixed fiber method used in the present invention, JP-A-2011-174215, JP-A-2011-208313, and JP-A-2012-136804 can precisely control the distance between the center of gravity points in the single yarn cross section for each single yarn. The method using the distribution plate exemplified in the publication is preferably used. In this case, precise control of the position of the center of gravity of the core in the eccentric core sheath cross section required in the present invention can be stably manufactured without using a complicated base technique. When applied to the crimped yarn of the present invention, the distance ratio between the central center of gravity points between single yarns Gmax / Gmin is suppressed while suppressing the whitening phenomenon of the fabric due to friction and impact and the exposure of the core component that causes fluffing. It is possible to secure a large amount to the limit.

In the method using such a distribution plate, the cross-sectional shape of the single yarn can be controlled by the arrangement of the distribution holes in the final distribution plate installed at the most downstream of the distribution plates composed of a plurality of sheets. That is, the cross-sectional morphology can be controlled by the arrangement of the distribution holes of the polymer A forming the core component and the polymer B forming the sheath component. Specifically, as illustrated in FIG. 4, the distribution hole 4 of the polymer B forming the sheath component surrounds the distribution hole 4- (b) of the polymer A forming the core component in the eccentric core sheath type composite cross section. By arranging − (a), it is possible to form the eccentric core sheath composite cross section required in the present invention. Here, it is possible to change the distance between the center of gravity points of the single yarn by arranging so as to change the arrangement of the distribution holes forming the core and sheath components, the number of holes, and the discharge amount of the polymer per distribution hole. be.

Further, from the viewpoint of expanding the degree of freedom in setting the distance between the center of gravity points, as illustrated in FIG. 5, the distribution holes 5- (c) forming the core component in the eccentric core sheath type composite cross section are simply provided. It is preferable to arrange the distribution holes 5- (a) forming a sheath component so as to be arranged along the contour of the yarn and to surround the yarn thinly. When a fiber is manufactured using a distribution plate having such a distribution hole arrangement, as illustrated in FIG. 6, a thin-skin eccentric core-sheath composite yarn in which a part of the sheath component is a uniform thin skin in the cross section of the single yarn. Is obtained. The thin-skinned eccentric core sheath cross section referred to here means an eccentric core sheath cross section that satisfies the following requirements.

(A) The ratio S / D of the minimum thickness S of the sheath component covering the core component and the fiber diameter D of the single yarn is 0.01 to 0.10.

(B) The peripheral length portion having a thickness within 1.05 times the minimum thickness S occupies 30% or more of the total peripheral length of the single yarn cross section.

The minimum thickness S at which the thickness of the sheath component covering the core component referred to here is the minimum is obtained as follows.

That is, the cross section of the crimped yarn is photographed by the same method as the distance between the center of gravity points described above. The value obtained by measuring the minimum thickness of the sheath component covering the core component from the captured image corresponds to the minimum thickness S referred to in the present invention. For the fiber diameter D and the minimum thickness S corresponding to the circumscribed circle diameter of the single yarn, the unit is measured as μm, the ratio (S / D) is calculated, and the fraction of the third decimal place or less is rounded off. be.

When the eccentric core-sheath composite yarn of the present invention satisfies the above requirements, the thin-skin eccentric core-sheath composite yarn has a center of gravity as compared with the conventional eccentric core-sheath composite yarn in which the area ratio of the core component to the single yarn cross section is the same. It is possible to set a larger distance between points. Therefore, the degree of freedom in setting the distance between the center of gravity points can be increased, and the distance between the center of gravity points can be greatly changed between the single yarns constituting the yarn bundle, which is suitable for the crimped yarn of the present invention.

In the cross section of the thin skin eccentric core sheath as described above, the number of the distribution holes 5- (a) of the polymer B forming the thin skin is 6 or more from the viewpoint of complete coating of the core component and uniform thickness of the thin skin. It is preferable to do so. Further, the S / D and the length of the minimum thickness can be controlled by arranging so as to change the number of distribution holes of the distribution holes 5- (a) forming the thin skin and the discharge amount of the polymer around the distribution holes. It is possible.

Further, in the case of the above-mentioned thin-skin eccentric core sheath cross section, since all the constituent single yarn cross sections completely cover the A component with the B component as shown in FIG. It is possible to suppress the bending of the discharge line (kneading phenomenon) that occurs due to the above. This is because the presence of the sheath component produces a force in the direction opposite to the bending direction of the polymer flow, and as a result, the force in the direction perpendicular to the spinning wire caused by the difference in flow velocity between the two polymers at the time of ejection of the base. It can be suppressed. Such a phenomenon is a useful technical feature for stably producing a fiber in which two or more types of single yarns having different cross-sectional morphologies are mixed by a spinning mixed fiber method, and has been studied by the present inventors. This discovery has led to the achievement of crimped yarn that could not be achieved by conventional technology.

In the spun mixed fiber adopted in the present invention, by suppressing the bending of the discharge line, it is possible to design the arrangement of the discharge holes of each single yarn with a high degree of freedom, and by changing the hole arrangement, the texture and appearance can be changed. It is also possible to control the fabric characteristics such as stretchability.

For example, when single yarns having different cross-sectional shapes are arranged in a houndstooth arrangement, each single yarn is well dispersed in the crimped yarn. Therefore, each of the single yarns independently develops crimping, and a soft and comfortable repulsive feeling having bulkiness due to the crimping phase shift and stretchability due to the crimping structure can be obtained. Further, if the single yarns having different cross-sectional shapes are arranged in groups, the crimped structure is focused by the biting of the crimped structure, and the focused portion becomes a stretch material with elasticity.

In addition, interference between single yarns on the spinning wire can be suppressed, the number of discharge holes per base can be increased, and the number of yarns can be increased to improve the sophistication and production efficiency.

In this way, the polymer flow whose cross section is formed by the distribution plate is contracted and discharged from the discharge hole of the spinneret. At this time, the discharge hole has the purpose of controlling the flow rate of the composite polymer flow, that is, the point at which the discharge amount is measured again and the draft (= take-up speed / discharge line speed) on the spinning wire. It is preferable to determine the pore diameter and the pore length in consideration of the viscosity and the discharge amount of the polymer. When manufacturing the crimped yarn of the present invention, the discharge hole diameter can be selected in the range of 0.1 to 2.0 mm, and the L / D (discharge hole length / discharge hole diameter) can be selected in the range of 0.1 to 5.0. can.
When using a base with this distribution plate installed, it is possible to stably manufacture with the same base by installing a plurality of distribution hole groups arranged so that the distance between the center of gravity points is different on the same distribution plate. can.

When melt spinning is selected for the crimped yarn of the present invention, the polymer used for the core component and the sheath component is preferably a fiber-forming thermoplastic polymer, and polyethylene terephthalate or a copolymer thereof, polyethylene naphthalate, etc. Examples thereof include melt-moldable polymers such as polybutylene terephthalate, polytrimethylene terephthalate, polypropylene, polyolefin, polycarbonate, polyacrylate, polyamide, polylactic acid, and thermoplastic polyurethane. In particular, polycondensation polymers typified by polyester and polyamide have a high melting point and are more preferable. When the melting point of the polymer is 165 ° C. or higher, the heat resistance is good, which is more preferable.

In the above polymers, various additives such as titanium oxide, silica, inorganic substances such as barium oxide, carbon black, colorants such as dyes and pigments, flame retardants, fluorescent whitening agents, antioxidants, and ultraviolet absorbers are added. The agent may be contained in the polymer.

For the combination of polymers used in the crimped yarn of the present invention, the core and sheath components may be selected according to the intended use, but in view of the purpose of the present invention, the shrinkage rate difference when heat shrinkage or the like is applied. It is preferable to use a combination that causes For example, the molecular weight of the above-mentioned polymer may be changed so that the component A in FIG. 1 is a high molecular weight polymer and the component B is a low molecular weight, or one can be used as a homopolymer and the other as a copolymer polymer. Further, for combinations having different polymer compositions, for example, polybutylene terephthalate / polyethylene terephthalate, polytrimethylene terephthalate / polyethylene terephthalate, thermoplastic polyurethane / polyethylene terephthalate, and polytrimethylene terephthalate / polybutylene terephthalate are suitable for the A component / B component. An example is given. At this time, from the viewpoint of discharge stability of the composite polymer flow, it is preferable to consider the difference in melt viscosity of the polymer, and the difference in melt viscosity of the combined polymer is preferably 400 Pa · s or less.

It is preferable that the spinning temperature is a temperature at which the polymer having a high melting point or a high viscosity mainly exhibits fluidity among the two or more kinds of polymers used in the crimped yarn. The temperature indicating this fluidity varies depending on the molecular weight, but the melting point of the polymer is a guide, and the temperature may be set to + 60 ° C. or lower. If it is less than this, unnecessary polymer deterioration is suppressed without thermal decomposition of the polymer in the spinning head or the spinning pack.

The discharge amount at the time of spinning the crimped yarn of the present invention can be stable and can be discharged from 0.1 g / min / hole to 20.0 g / min / hole per discharge hole. It is preferable to determine from the above range according to the desired fineness in consideration of winding conditions, draw ratio and the like.

Further, in the present invention, it is preferable to set the discharge amount of the A component and the B component so that the area ratio fa of the A component in the cross section of the single yarn is 30 to 70%. By setting the area ratio of the component A within the range, the difference in elongation and deformation between the polymers in the spinning wire can be reduced, and a yarn of good quality with small yarn diameter unevenness in the fiber axis direction can be obtained.

Further, in the crimped yarn of the present invention, it is preferable that the area ratio fa of the component A is the same for all the single yarns constituting the crimped yarn.

The area ratio fa of the component A referred to here is obtained as follows.
That is, the cross section of the crimped yarn is photographed by the same method as the distance between the center of gravity points described above. From the captured image, the area Af of the circumscribed circle of the single thread and the area Aa of the A component are measured by any image analysis software (for example, WinROOF manufactured by Mitani Corporation), and calculated by fa = Aa / Af × 100 (%). , Round off to the first or lower minority.
The fact that the area ratio of the component A referred to here is the same for all the single yarns constituting the crimped yarn means that the fa variation is 15.0% or less.

The "fa variation" as used herein means that the fa is measured for all the single yarns constituting the crimped yarn measured by the above method, and the fa variation (faCV%) = (standard deviation of fa /) based on the measurement result. It is a value calculated as (mean value of fa) x 100 (%), and is rounded off to the second decimal place. The above operation was performed for 10 images taken in the same manner, and the simple number average value of the evaluation results of the 10 images was defined as fa variation.
As long as the fa variation is within the range, it can be considered that the fa is the same for all the single yarns in the crimped yarn. Therefore, the mechanical characteristic variation between the single yarns can be suppressed, and when the yarn is wound. No slack occurs in the threads, and it is possible to suppress defects such as fluff.

Further, since the area ratio fa of the component A is the same for all the single yarns in the crimped yarn, it is possible to obtain a crimped yarn containing a large number of gaps between yarn bundles caused by the crimping phase shift, which is the object of the present invention. Can be done.

In the single yarn of the eccentric core-sheath composite yarn in the crimped yarn, the larger the area ratio of the highly contracted component, the higher the force to develop the crimped structure. Here, when there is a variation in fa between the single yarns in the yarn bundle, the single yarn having a low ratio of the high shrinkage component and a small crimping ability cannot sufficiently develop the crimping structure due to the restraint by the other single yarns. As a result of being caught in the crimp structure of a single yarn having a large crimp-developing power, the crimp phase may be aligned.

Therefore, also from this point of view, in the present invention, the crimp phase shift can be exhibited by making the fas of all the single yarns constituting the crimped yarns the same and making the crimping expression power of each single yarn the same. It is possible to obtain a crimped yarn containing a large number of voids between the desired yarn bundles.

The discharged composite polymer flow is cooled and solidified by cooling air whose wind speed and temperature are kept constant. For the cooling air, the wind speed and temperature may be determined in consideration of the cooling efficiency of the yarn and the stabilization of the solidification point atmosphere. When considering a spinning mixed fiber, the degree of deflection of the spinning wire differs depending on the type of single yarn constituting the crimped yarn. Therefore, the polymer composition, spinning temperature, hole arrangement, etc. of each single yarn should be determined. Considering this, it is preferable to determine the cooling method so that interference does not occur.

The cooled and solidified yarns are simultaneously focused and oiled. Here, since each single yarn diffuses into the crimped yarn when it is focused, it is necessary to obtain a crimped yarn having good dispersibility of the single yarn like the crimped yarn of the present invention. It is preferable to focus the threads of the above at the same time. Further, the oil agent to be used may be determined by the lubrication method, the amount of adhesion, and the type in consideration of winding conditions, higher-order processing, process passability, and the like. Further, in order to promote uniform adhesion of the oil agent, a slight entanglement may be imparted by an interlaced nozzle or the like so as not to impair the object of the present invention.

The yarn to which the oil agent is applied becomes a crimped yarn by being taken up by a roller having a specified peripheral speed. Here, the take-up speed may be determined from the discharge amount, the target fiber diameter, the high-order processing process, etc., but in order to stably manufacture the crimped yarn of the present invention, it should be in the range of 100 to 7000 m / min. It is preferable to do so. From the viewpoint of high orientation and improvement of mechanical properties, it is possible to perform stretching after being wound once, or to continue stretching without winding once.

The stretching conditions include, for example, in a stretching machine consisting of a pair or more of rollers, if the fiber is made of a polymer generally capable of melt spinning, the first roller is set to a temperature equal to or higher than the glass transition temperature and lower than the melting point. Due to the peripheral speed ratio of the second roller corresponding to the crystallization temperature, the fiber is reasonably stretched in the fiber axis direction, and is thermally set and wound. Further, in the case of a polymer showing no glass transition, dynamic viscoelasticity measurement (tan δ) of the composite fiber may be performed, and a temperature equal to or higher than the peak temperature on the high temperature side of the obtained tan δ may be selected as the preheating temperature. Here, from the viewpoint of increasing the stretching ratio and improving the mechanical characteristics, it is also a preferable means to perform this stretching step in multiple stages.

As described above, the method for producing a crimped yarn of the present invention has been described based on a general melt spinning method, but it goes without saying that it can also be produced by a melt blow method and a spunbond method, and further, wet and dry wet. It is also possible to manufacture by a solution spinning method such as.

Hereinafter, the crimped yarn of the present invention will be specifically described with reference to examples.
The following evaluations were made for Examples and Comparative Examples.

(1) Fineness The fineness was calculated by measuring the weight of 100 m of the fiber to be evaluated and multiplying by 100. This was repeated 10 times, and the value obtained by rounding off the first decimal place of the simple average value was taken as the fineness.

(2) Fiber strength and breaking elongation The sample is subjected to a tensile tester (Orientech's "TENSILON UCT-100") under the constant speed elongation conditions shown in the JIS L1013 (2010) 8.5.1 standard time test. It was measured. At this time, the gripping interval was 20 cm, the pulling speed was 20 cm / min, and the number of tests was 10 times. The elongation at break was obtained from the elongation of the point showing the maximum strength on the SS curve.

(3) Distance between center of gravity points (G / D) and distance ratio between center of gravity points (Gmax / Gmin)
The crimped yarn is embedded in epoxy resin, frozen with a Reichert FC / 4E type cryosectioning system, cut with a Reichert-Nissei ultracut N (ultramicrotome) equipped with a diamond knife, and then the cut surface is cut. ) The image was taken with a VE-7800 scanning electron microscope (SEM) manufactured by KEYENCE at a magnification at which 10 or more single crimped yarns could be observed. From this image, the fiber diameter D corresponding to the circumscribed circle diameter of the single thread and the distance G between the center points of the circumscribed circle and the inscribed circle of the core component were obtained using image processing software (WINROOF). From these results, the distance between the center of gravity points (G / D) of the single yarn was measured.
In addition, the above measurement was performed for all the single yarns constituting the crimped yarn, the distribution of the distance between the center of gravity points as shown in FIG. 3 was created from the results, and the single yarns were classified according to the distance between the center of gravity points. The distance between the central center of gravity points, which is the peak value with the largest number of abundance in each single yarn group, was calculated. Based on this result, the distance between the central center of gravity points (Gmax / Gmin) was calculated using the one with the largest distance between the central center of gravity points (Gmax) and the one with the smallest distance (Gmin) among the crimped yarns.
All of the above values were measured for each of the 10 photographs and used as the average value of the 10 points. The circumscribed circle diameter D of the single yarn and the distance G between the center points were measured to the second decimal place in μm units. Rounding down to the first decimal place, and G / D rounding off to the third decimal place. Further, Gmax / Gmin rounds off to the third decimal place.

(4) Adjacent filament group ratio The cross section of all single yarns of the crimped yarn was photographed two-dimensionally by the same method as the distance between the center of gravity points described above, and based on the result of classification by the distance between the center of gravity points, from the image. For five randomly selected single yarns, the number of single yarns constituting the adjacent filament group is counted. Based on this measurement result, the adjacent filament group ratio = (number of single yarns constituting the adjacent filament group) / (total number of single yarns of interest) × 100 (%) is calculated. The above measurement was carried out at 10 or more points of the crimped yarn, and the ratio of adjacent filament groups of the yarn bundle evaluated by rounding off the first decimal place of the simple number average of the measurement result was evaluated.

(5) Degree of deformation The cross section of the single thread is photographed two-dimensionally by the same method as the distance between the center of gravity described above, and the fiber diameter D corresponding to the circumscribed circle diameter of the single thread and the diameter of the perfect circle inscribed in the single thread. Measure the diameter of the inscribed circle. From these results, the degree of deformation = fiber diameter ÷ inscribed circle diameter is calculated, and up to the third decimal place is obtained, and the third decimal place and below are rounded off. The above measurement is performed with 10 or more single yarns randomly selected from the image, and the simple number average of the measurement results is rounded off to the third decimal place.

(6) Evaluation of bulkiness of crimped yarn (width of yarn bundle)
The bulkiness was evaluated by measuring the width of the yarn bundle of the crimped yarn after the boiling water treatment.
First, the prepared crimped yarn is squeezed and immersed in boiling water with substantially no load, and the treatment is performed for 15 minutes. Then, after the treated yarn is sufficiently dried, it is attached to a slide glass with an adhesive or the like under a load of 0.2 mg / d, and the yarn bundle width is adjusted with a digital microscope (Keyence, VHX-2000). Take a picture at an observable magnification. The yarn bundle width is measured at 10 points randomly selected from the obtained image with the unit being μm, and the thread bundle width is calculated by taking a simple numerical average of the measurement results at the 10 points. The above measurement was carried out with 10 or more images, and the bulkiness was evaluated by the yarn bundle width evaluated by rounding off the first decimal place or less of the simple number average of the measurement result.

(7) Fabric evaluation (bulkyness, surface tactile sensation, motion followability)
Using crimped yarn for the weft yarn and polyester fiber of 56dtex-18 filament for the warp yarn, a woven fabric with a 1/3 twill structure was prepared at a weft yarn density of 113 yarns / inch, and refined at 80 ° C. for 20 minutes to 180. After performing an intermediate set at ° C for 1 minute, a relaxing treatment at 120 ° C for 20 minutes was performed.
The woven fabric sample prepared above was evaluated by 10 experts for the bulkiness of the woven fabric (determined by ◎, ○, ×) and the tactile sensation of the surface (particularly the smoothness of the surface, judged by ◎, ○, ×). ..
In addition, the followability (motion followability) when the woven fabric was deformed was evaluated by the following three-step judgment method based on the elongation when the woven fabric sample was stretched in the weft direction and the softness when pulled. ..
⊚: Especially soft and greatly stretched ○: Soft and greatly stretched ×: Insufficient stretch or / and high resistance when pulling.

Example 1
Polybutylene terephthalate (PBT) having a melt viscosity of 160 Pa · s was used as the core component of all the single yarns constituting the crimped yarn, and polyethylene terephthalate (PET1) having a melt viscosity of 30 Pa · s was used as the sheath component. After melting these polymers individually, they are weighed by a pump and separately poured into the same spinning pack incorporating the distribution plate having the distribution holes illustrated in FIG. 5, and the spinning temperature is set to 280 ° C. It was discharged from the discharged hole.
In the first embodiment, a distribution plate having two types of distribution hole groups H and L whose distribution hole arrangements are designed so that the distances between the central center of gravity points are 0.39 and 0.22, respectively, when the fibers are used, is provided. Using. In each of the single yarns discharged from the distribution hole groups H and L, a part of the B component polymer covering the A component polymer becomes a uniform thin skin, and the composite cross section satisfying the requirement of the thin skin eccentric core sheath cross section in the present invention ( It forms FIG. 6). The shape of the discharge holes is round (out of shape degree 1.0) for all holes, and the number of discharge holes of the base is 36 holes corresponding to the distribution holes H and L, respectively, and the distribution holes H in the base surface. A base having a concentric hole arrangement arranged so as to surround the discharge hole group corresponding to the above with the discharge hole group corresponding to the distribution hole L was used.
The discharge ratio of the core and sheath components was set to 50/50 for all single yarns, the discharged composite polymer flow was cooled and solidified, then oiled, wound at a spinning speed of 1000 m / min, and undrawn fibers of 180 dtex-72 filaments were obtained. Collected.

By discharging the composite polymer flow while precisely controlling it with the distribution plate shown in FIG. 5, the bending of the discharged polymer flow seen just below the base surface is suppressed to an extremely small size, and the discharge stability is excellent. there were.

The undrawn fibers wound up were stretched 3.2 times at a stretching speed of 600 m / min between rollers heated to 70 ° C. and 130 ° C. to obtain a crimped yarn of the present invention of 56dtex-72 filament.

The obtained crimped yarn had a strength of 3.7 cN / dtex and an elongation of 34%, which were sufficient mechanical properties to withstand practical use, and the degree of deformation of the single yarn was 1.04. Further, when the cross section of the yarn bundle was observed, two types of single yarns having different cross-sectional shapes were included in the yarn bundle, and the distances between the central center of gravity points of each were 0.39 and 0.22, respectively. The point-to-point distance ratio (Gmax / Gmin) was 1.77. Further, the ratio of the adjacent filament group was 52%, and the single yarns having a suitable cross-sectional morphological difference capable of expressing a large difference in the crimped morphology were well dispersed in the yarn bundle.

Therefore, the yarn width after the boiling water treatment is 440 μm, and the crimping phase shift occurs due to the crimping morphological difference between the two types of well-dispersed single yarns, resulting in excellent bulkiness.
When the crimped yarn is used as a woven fabric and relaxed, the yarn bundle contains fine voids due to the crimping phase shift, but stretchability is exhibited, so that there is swelling, and the yarn has a soft and comfortable repulsion. It was a thing (bulkyness: ◎, motion followability: ◎). Furthermore, due to the difference in yarn length caused by the difference in crimping morphology, a single yarn with a low crimping rate floats on the surface while exhibiting loose crimping, so that it has a comfortable tactile sensation that has never been seen before (surface tactile sensation: ◎. ).

Examples 2 and 3
In Examples 2 and 3, the crimped yarn of the present invention was obtained in the same manner as in Example 1 except that the hole arrangement of the discharge holes was changed as shown in Table 1.
The evaluation results of the crimped yarns of Examples 2 and 3 are as shown in Table 2. In each case, as in Example 1, the bending of the discharged polymer flow seen immediately below the base surface is extremely small, and the discharged polymer flow is discharged. It was excellent in stability.
In the crimped yarns of Examples 2 and 3, the ratio of adjacent filament groups, which indicates the degree of dispersion of single yarns in the yarn bundle, changes depending on the hole arrangement. Since the single yarns were focused at the same time, the dispersibility was good.

Since the crimped yarn of Example 2 has a houndstooth arrangement of discharge holes, the ratio of adjacent filament groups is low, the dispersibility of the single yarn in the crimped yarn is extremely good, and the bulkiness is extremely excellent. It was a thing.
When the fabric was subjected to heat treatment or the like, the yarn bundle contained minute voids, and while the yarn bundle had an excellent swelling feeling, the sagging of the single yarn due to the difference in yarn length was suppressed, and the yarn had a plain surface quality.

On the other hand, the crimped yarns of Example 3 are arranged in groups so that single yarns of the same type are dispersed in the crimped yarns in a state of being appropriately close to each other, and some of them are focused to develop crimping. Therefore, it was a little inferior to the bulkiness, but it was at a level where there was no problem.
When the cloth was subjected to heat treatment or the like, it had a suitable swelling feeling, but had a stretchability with elasticity because the focused portion formed a large crimp. The results are shown in Table 1.

Examples 4 and 5
In Examples 4 and 5, the crimped yarn of the present invention is the same as in Example 1 except that the distribution hole arrangement on the distribution plate is changed so that the distance between the central center of gravity points of the single yarn is as shown in Table 1. Got
In Examples 4 and 5, although the distance between the center of gravity points of the constituent single yarns changed, the bending of the discharged polymer flow just below the base surface was suppressed by discharging while precisely controlling the composite polymer flow, and the discharging was performed. It was excellent in stability.

In the crimped yarn of Example 4, the difference in the crimping morphology is widened by increasing the distance ratio between the central center of gravity points between the single yarns, and the slack of the single yarn having a low crimping ratio due to the difference in yarn length is remarkable. rice field. For this reason, the cloth has a good swelling feeling, but has appropriate irregularities on the surface of the cloth, and has a comfortable touch feeling.

In the crimped yarn of Example 5, the distance ratio between the central center of gravity points between the single yarns is small, and the difference in the crimped morphology is small. There was no problem. Further, since the difference in the crimp ratio was small, the slack of the single yarn due to the difference in the yarn length was hardly observed, and when the woven fabric was used, the surface quality was smooth while having a swelling feeling.

Example 6
In Example 6, the crimped yarn of the present invention is used in the same manner as in Example 1 except that the discharge hole of the discharge plate used in Example 1 is made elliptical with the same area and the degree of deformation is 1.50. Obtained. The discharge hole was designed so that the long axis direction of the discharge hole coincided with the line connecting the center of gravity points of the single yarn and the core component.
In Example 6, the degree of deformation was increased, so that the bending of the discharged polymer flow immediately below the base surface was suppressed, and the discharge stability was excellent.
In the crimped yarn of Example 6, the degree of deformation of the single yarn was measured to be 1.42, and the increased degree of deformation increased the ratio of adjacent filament groups, although the object of the present invention was not impaired. Although the dispersibility of the single yarn in the yarn bundle was low, when it was made into a cloth, it had a good swelling feeling and a unique surface touch feeling due to the deformed shape.

Example 7
In Example 7, three types of distribution hole groups H, M, and L whose distribution hole arrangements are designed so that the distances between the central center of gravity points are 0.39, 0.29, and 0.22, respectively, when the fiber is used, are formed. Surprisingly, the crimped yarn of the present invention was obtained in the same manner as in Example 1 except that the provided distribution plate was used. In each of the single yarns discharged from each distribution hole group, a part of the B component polymer covering the A component polymer becomes a uniform thin skin, and the composite cross section satisfying the requirement of the thin skin eccentric core sheath cross section in the present invention ( It forms FIG. 6). Further, the number of discharge holes of the mouthpiece is 24 holes corresponding to each of the distribution hole groups H, M and L, and the discharge hole group corresponding to the distribution hole H in the mouthpiece surface is discharged corresponding to the distribution hole M. A mouthpiece having a concentric hole arrangement was used, which was arranged so as to be surrounded by a group of holes, and further arranged so as to surround the group of discharge holes corresponding to the distribution holes M with the group of discharge holes corresponding to the distribution holes L.
In Example 7, although the distance between the center of gravity points of the constituent single yarns changed, the bending of the discharged polymer flow just below the base surface was suppressed by discharging while precisely controlling the composite polymer flow, and the discharging stability was suppressed. Was excellent.
Observing the cross section of the crimped yarn of Example 7, all three types of single yarns are dispersed very well in the yarn bundle, and the ratio of adjacent filament groups is extremely low, so that the crimps between the single yarns are almost the same. The crimp phase shift occurred without meshing, and it had excellent bulkiness. When the fabric is made, the presence of three different crimped single yarns, large, medium and small, in the yarn bundle contains extremely small voids in the yarn bundle, so that the fabric has elasticity when crushed. It had a unique tactile sensation, coupled with the swelling sensation due to the crimping phase shift.

Example 8
In Example 8, a distribution plate having two types of distribution hole groups H and L (distance between central center of gravity points H: 0.39, L: 0.22) similar to the distribution plate of Example 1 is provided. A base was used in which the number of discharge holes corresponding to each distribution hole group was 24 holes. The shape of the discharge holes is round (deformation degree 1.00) for all holes, and the hole arrangement in the base surface is such that the discharge hole group corresponding to the distribution hole H is surrounded by the discharge hole group corresponding to the distribution hole L. It was a concentric hole arrangement arranged in. The polymer combination, spinning temperature, and polymer discharge ratio constituting the crimped yarn are the same as in Example 1, and the composite polymer flow is cooled and solidified, then an oil agent is applied, and the yarn is wound at a spinning speed of 1000 m / min to achieve 180 dtex-48. The undrawn fibers of the filament were collected.
Due to the increase in the fineness of the single yarn, the bending of the discharged polymer flow seen just below the base surface was extremely small, and the discharge stability was excellent.
The wound unstretched fiber was stretched under the same conditions as in Example 1 to obtain a crimped yarn of the present invention of 56dtex-48 filament.
In the crimped yarn of Example 8, the ratio of adjacent filament groups was slightly increased due to the increase in the fineness of the single yarn, and the dispersibility of the single yarn was slightly inferior, but the moment when the single yarn developed the crimped structure was increased. The effect of eliminating single yarns was enhanced, and the yarns had excellent bulkiness. When used as a woven fabric, it has a slightly hard texture as the fineness of the single yarn increases, but it has an excellent swelling feeling and a lightweight feeling due to the inclusion of many voids in the yarn bundle. The results are shown in Table 2.

Examples 9 and 10
In Examples 9 and 10, the polymer was changed as shown in Table 2, and a mouthpiece having the same discharge hole arrangement and number of discharge holes as in Example 1 was used, and the elongation of the crimped yarn obtained in each Example was 30 to 40. The spinning condition and the drawing condition were set so as to be%, and the crimped yarn of the present invention was obtained.
In Examples 9 and 10, since the difference in melt viscosity between the two types of polymers constituting the crimped yarn becomes large, the bending of the discharged polymer immediately below the base surface becomes large, but the level is not a problem and stable discharge is possible. Met.
In the crimped yarn of Example 9, by using PPT as a high shrinkage component, the effect of eliminating single yarns is reduced due to the low Young's modulus of PPT, but the ratio of adjacent filament groups is low, and the single yarns are dispersed. Since it has good properties, it has high bulkiness, and when it is used as a fabric, it has a soft texture and good and soft stretchability.
The crimped yarn of Example 10 uses PET2 (melt viscosity: 290 Pa · s) as a high shrinkage component, so that the Young's modulus of the crimped yarn is large, and the texture of the crimped yarn is slightly hardened when used as a woven fabric, but it is elastic. It became a cloth texture. On the other hand, the tension in the yarn making process is high, and the single yarns tend to get together when concentrating the yarn bundles. Therefore, the ratio of adjacent filament groups is low, the dispersibility of the single yarns is good, and the high Young's modulus Since the effect of eliminating single yarns is increased, the fabric has a good swelling feeling.

Comparative Example 1
In Comparative Example 1, a crimp yarn (90dtex-36 filament) using a mouthpiece incorporating a distribution plate composed of only one type of each of the distribution holes H or L of Example 1 for PBT and PET1 used in Example 1. Was spun in different steps, and then simultaneously fed with a drawing machine to draw a combined yarn to obtain a crimped yarn (56dtex-72 filament, distance ratio between central center of gravity points: 1.77, degree of deformation: 1). .04).
In the crimped yarn of Comparative Example 1, the dispersibility of the single yarn in the yarn bundle was poor as compared with the crimped yarn of the present invention, and the existence probability of the same kind of single yarn was concentrated. Therefore, due to the difference in yarn length between the single yarns, there is a portion where the single yarns having a low crimp ratio are focused and float on the surface, and the surface of the fabric has a slightly rough texture as compared with Example 1, which is an object of the present invention. It didn't become a cloth.

Comparative Example 2
In Comparative Example 2, a crimp yarn (28dtex-36 filament) using a mouthpiece incorporating a distribution plate composed of only one type of each of the distribution holes H or L of Example 1 for PBT and PET1 used in Example 1. ) Are spun and drawn in separate steps, and then mixed with an interlaced nozzle to obtain crimped yarn (56dtex-72 filament, distance ratio between central center of gravity points: 1.77, degree of deformation: 1.04). rice field.
Since the crimped yarn of Comparative Example 2 is entangled by the interlaced nozzle, the dispersibility of the single yarn in the yarn bundle may be improved at the entangled portion, but the bulkiness is not sufficient as compared with Example 1. .. Further, in the unentangled portion, as in Comparative Example 1, single yarns having a low crimping ratio are focused and float on the surface, so that the surface of the fabric has a slightly rough texture as compared with Example 1, which is an object of the present invention. It did not become a cloth.

Comparative Example 3
In Comparative Example 3, a crimped yarn was obtained in the same manner as in Example 1 except that the distribution hole arrangement on the distribution plate was changed so that the distance between the central center of gravity points of the single yarn was as shown in Table 2.
Since the crimped yarn of Comparative Example 3 has an extremely small distance ratio between the central center of gravity points between the single yarns, all the single yarns have almost the same crimped shape, and as a result, the crimped yarns are bitten into the fibers. The crimp phase was aligned at most points in the longitudinal direction. Therefore, the effect of eliminating the single yarn and the single yarn could not be obtained, and the bulkiness of the fabric was inferior to that of Example 1, and the fabric was not the object of the present invention.

This material is a woven or knitted fabric that has the stretchability that is characteristic of crimped yarn, but also has a comfortable swelling and a flexible tactile sensation. It can be widely used from general apparel clothing such as inner and outer, and can provide unprecedented stress-free stretch material.

a: Center of gravity point of component A in the single thread cross section constituting the crimped thread c: Center point G of the single thread cross section constituting the crimped thread: Distance between the center of gravity a and the center c 2- (a), (b) : An example of a single yarn having the same cross-sectional shape adjacent to each other in the crimped yarn cross section 2- (c): An example of an adjacent filament group in the crimped yarn cross section 3- (a): A single yarn constituting the crimped yarn Distribution of the distance between the center of gravity points of 3- (b): Distance between the center of gravity points of the single yarn A constituting the crimped yarn 3- (c): Distribution of the distance between the center of gravity points of the single yarn B constituting the crimped yarn 3- (d): Distance between the center of gravity points of the single yarn B constituting the crimped yarn 3- (e): Distribution width of the distance between the center of gravity points of the single yarn A constituting the crimped yarn 3- (f) :. Distribution width of the distance between the center of gravity points of the single yarn B constituting the crimped yarn 4- (a): Distribution hole of the B component forming the sheath component among the distribution holes in the final distribution plate 4- (b): Final distribution Of the distribution holes in the plate, the distribution hole of the A component forming the core component 5- (a): Of the distribution holes in the final distribution plate, the distribution hole of the B component forming the thin skin 5- (b): The final distribution plate Of the distribution holes in the above, the distribution holes of the B component other than 5- (a) 5- (c): Of the distribution holes in the final distribution plate, the distribution holes of the A component S: the minimum thickness of the B component D: fiber diameter

Claims (4)

A crimped yarn characterized in that single yarns of eccentric core sheath composite yarns satisfying the following (A) and (B) having two or more different cross-sectional forms are dispersed and mixed in a yarn bundle.
(A) The ratio S / D of the minimum thickness S of the sheath component covering the core component and the fiber diameter D of the single yarn is 0.01 to 0.10.
(B) The peripheral length portion having a thickness within 1.05 times the minimum thickness S is 30% or more of the total peripheral length of the single yarn cross section. The crimped yarn according to claim 1, wherein the ratio of the distance between the central center of gravity points between the polymers in the cross section of the single yarn in the crimped yarn is different by 1.10 times or more. The crimped yarn according to claim 1 or 2, wherein the degree of deformation of all single yarns is 1.50 or less. A textile product containing at least a part of the crimped yarn according to any one of claims 1 to 3.

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