JP6465090B2 - Bulky yarn - Google Patents

Description

  The present invention relates to a bulky yarn having both excellent stretch properties and bulkiness.

  Synthetic fibers made of thermoplastic polymers such as polyester and polyamide are characterized by high basic properties such as mechanical properties and dimensional stability, and excellent balance. Fiber materials utilizing these are widely used not only for clothing but also for interiors, vehicle interiors, and industrial applications by high-order processing of fibers obtained by spinning. It is no exaggeration to say that the development of new technologies related to synthetic fibers has been a technological innovation that has been motivated by imitation of natural materials. Therefore, various technical proposals have been made in order to express functions derived from natural complex structural forms with synthetic fibers. For example, by imitating the cross section of silk, a special texture such as creaking and flexibility is developed. Special colors are created by imitating morpho butterflies. Further, by imitating a lotus leaf, the fabric has water repellency. There are efforts to obtain a fiber structure having functions such as the soft texture of natural feathers, light weight and heat retention.

  From natural feathers, a mixture of downballs (grain-like) and feathers (feathers), which are generally collected from small breasts of waterfowl, are used. These are derived from a specific structural form made of the keratin fibers, rich in soft texture, and easy to follow along with the body and exhibit excellent light weight and heat retention. For this reason, products using natural feathers as stuffed cotton have been recognized by ordinary users for their functions, and are widely applied to clothing such as bedding and jackets. However, there is a limit to catching water birds from the viewpoint of nature conservation, and the total production of natural feathers is limited. Furthermore, due to recent abnormal weather and the occurrence of epidemics, there is a problem that the supply amount fluctuates greatly, and the price increase has also become a problem. In addition, the use of natural feathers has often caused problems such as peculiar odor and animal allergy despite many processes such as hair collection, selection, disinfection, and degreasing. From the viewpoint of animal welfare, there is a movement to eliminate the use of natural feathers in Europe and other countries. For this reason, attention has been focused on filling materials made of synthetic fibers that can be stably supplied.

  Numerous batting materials made of synthetic fibers have been proposed for a long time, but there have been no examples that have reached natural feathers in terms of basic properties such as bulkiness, compression recovery, and soft texture.

  Conventionally, yarn processing technology used for the purpose of increasing added value of fibers is, for example, fiber-twisting after actually twisting the fibers, or mixing one or two or more types of fibers with a fluid processing nozzle or the like By doing so, it is generally known that a processed yarn having bulkiness can be produced. Since the processed yarn with such bulkiness is basically a long fiber, it can be processed into various forms, and it can be applied to batting materials by taking advantage of the bulkiness and soft texture of the processed yarn. Conceivable.

  Patent Document 1 discloses the following processed yarns. First, using two types of fibers, a yarn is fed to only one of the fibers while being fed to the waist gauge, and a real twist is applied together to form a loop with the fibers imparted with the yarn. Thereafter, it is further twisted by rubbing with two disks or the like to obtain a bulky processed yarn. Heat treatment is applied after the untwisting step, or the sheath yarns are fused together with a binder to strengthen the fixation of the sheath yarns. Certainly, the method disclosed in Patent Document 1 may obtain a bulky yarn having a loop made of a sheath yarn by adjusting the degree of yarn sway or the like in accordance with a conventional method.

  Patent Document 2 discloses a technique in which an excessively supplied sheath yarn is fixed with a yarn length difference by injecting compressed air from a vertical direction with respect to a running yarn in an entanglement nozzle, opening and entanglement. doing. In Patent Document 2, as in Patent Document 1, a processed yarn having a bulkiness in which a sheath thread having a loop shape exists can be obtained.

  Bulky yarns with such loops are entangled between fibers, and this is generally recognized as a zipper phenomenon. It is supposed to affect. For this reason, there is also an attempt to improve from the fluid processed yarn as a starting point.

  Patent Document 3 discloses that, in a fluid jetted yarn, the loop portion is made of polytrimethylene terephthalate (3GT), thereby making the bulky processed yarn less likely to cause a fastener phenomenon by utilizing the elasticity of 3GT fiber. is there.

JP 2011-246850 A JP 2012-67430 A Japanese Patent Laid-Open No. 11-1000074

  In Patent Document 1 of the above-mentioned prior art, there is a possibility that a binder is mixed in advance, and it can be applied as a batting material by fusing it after processing and fixing the loop. However, when a real twist is applied to the loop yarn from which the sheath yarn partially protrudes and the yarn is opened by rubbing with rubber of a mechanical kneader or the like, the loop is partially broken or deteriorated. When this processed yarn is used as batting, it is finally filled by bundling several to several tens. As a result, in many cases, the sheath yarn is broken and becomes fluffed and entangled with the nearby sheath yarn of the processed yarn, which may worsen the unraveling process and process passability in the molding process. Furthermore, there is a problem that when the processed yarn is filled with the sheath yarn, the sheath yarn is entangled between the processed yarns, thereby creating a feeling of foreign matter and impairing the texture. In addition, there is also a problem that the feeling of foreign matter becomes more noticeable when the intertwined portions are fused and fixed.

  According to the technique of Patent Document 2, when the running yarn is disturbed in the nozzle and the fiber is opened and entangled, the yarn is swayed in a very short period to generate the entanglement of the running yarn. It becomes. For this reason, small loops that are naturally influenced by the nozzle shape are frequently formed excessively. Also, the sheath yarn randomly entangled with the core yarn, so that the size of the loop fluctuated in the fiber axis direction, and the bulkiness was insufficient. Further, after the loop yarn formed in the nozzle stays in the nozzle, it is discharged out of the nozzle by the jet air. For this reason, the size of the loop and the length of the sheath yarn forming the loop fluctuate in the fiber axis direction of the processed yarn to form a slack. In this case, the sheath yarn having a slack is likely to be entangled with the other sheath yarn, and the problems remain such that the process passability in high-order processing and the entangled portion of the sheath yarn lead to a foreign object feeling.

  The technology of Patent Document 3 uses a 3GT that elastically deforms and deforms, so that the sheath thread has an appropriate resilience, but the loop is compact even when the yarn length is different, and the fastener phenomenon May be suppressed. However, the loop is as small as about 0.6 mm, and when the number of loops is increased in order to aim for bulkiness, the density of the sheath yarn increases, so that the entanglement between the sheath yarns easily occurs and the fastener phenomenon may not be suppressed. is there.

The above-mentioned subject is achieved by the following means.
(1) A sheath yarn having a three-dimensional crimped structure that is not substantially broken and continuously forms a loop, and a core yarn that fixes the sheath yarn by crossing the sheath yarn 10% modulus is less than 1.5 cN / dtex, the fiber elongation ratio at the time of applying a load is 1.1 or more, and the fiber length restoration rate after the application of a load is 80 to 100%. A characteristic bulky yarn.
(2) The single yarn fineness ratio (sheath / core) of the sheath yarn and the core yarn is 0.1 to 2.0, and the intersection of the sheath yarn and the core yarn is 0.1 to 15.0 in the fiber axis direction of the bulky yarn. The bulky yarn according to claim 1, wherein the crimped structure of the sheath yarn has a radius of curvature of 2.0 to 30.0 mm.
(3) The bulky yarn according to claim 1 or 2, wherein the single yarn fineness of the fibers constituting the bulky yarn is 3.0 dtex or more.
(4) The bulky yarn according to any one of claims 1 to 3, wherein the fiber elongation ratio at the time of applying a load is 1.5 or more, and the fiber length recovery rate after the application of the load is 90 to 100%. .
(5) The bulky yarn according to any one of claims 1 to 4, wherein the sheath yarn is a hollow cross-section fiber having a hollow ratio of 10% or more.
(6) A textile product comprising at least a part of the bulky yarn according to any one of claims 1 to 5.

  The bulky yarn of the present invention has a loop shape and is prevented from being entangled between bulky yarns, has good handleability in high-order processing, has a soft texture, and is lightweight. In addition to the characteristics as a high-performance heat-insulating material such as heat-retaining properties, it can be stretched and deformed flexibly with low stress and has high deformation recovery characteristics. For this reason, the material is easy to adjust to the shape of the body, is excellent in the fitting performance to the body, and is excellent in durability against deformation repeatedly applied every time it is worn.

Schematic side view of an example of the bulky yarn of the present invention Simulated diagram for explaining the processing thread center line measurement method Simulated diagram for explaining the three-dimensional crimped structure Schematic process drawing schematically showing an example of a method for producing a bulky yarn of the present invention The schematic side view for demonstrating the suction nozzle used for the manufacturing method of the bulky yarn of this invention Schematic sectional view for explaining a discharge hole of a spinneret for hollow section used in the method for producing a bulky yarn of the present invention

  Since the bulky yarn of the present invention can be obtained by processing a multifilament, the bulky yarn and the material on the way to the production of the bulky yarn are sometimes expressed as “processed yarn”.

  The bulky yarn of the present invention is made of synthetic fiber and has a bulky structure. This structure is composed of a sheath yarn that forms a loop and a core yarn that substantially crosses the sheath yarn to fix the sheath yarn. The sheath yarn has a three-dimensional crimped structure. Further, in the present invention, the sheath yarn is not substantially broken. That is, the sheath yarn is almost continuous with a bulky yarn. The sheath yarn continuously forms a plurality of loops.

  The synthetic fiber referred to here is a fiber made of a polymer. As this synthetic fiber, a fiber produced by melt spinning or solution spinning can be employed. Of the high molecular weight polymers, thermoplastic polymers that can be melt-molded are suitable for use in the present invention because the fibers used in the present invention can be produced by employing a melt spinning method with high productivity.

  The thermoplastic polymer here means, for example, polyethylene terephthalate or a copolymer thereof, polyethylene naphthalate, polybutylene terephthalate, polytrimethylene terephthalate, polypropylene, polyolefin, polycarbonate, polyacrylate, polyamide, polylactic acid, thermoplastic polyurethane, etc. And a melt moldable polymer. Among these thermoplastic polymers, polycondensation polymers represented by polyesters and polyamides are crystalline polymers, and since they have a high melting point, they were heated at a relatively high temperature during post-processing, molding and actual use. Even in the case, there is no deterioration or settling, which is preferable. From the viewpoint of heat resistance, the melting point of the polymer is preferably 165 ° C. or higher.

  The bulky yarn of the present invention has high elongation characteristics with low stress and exhibits high elongation recovery characteristics. Since the elongation characteristic of the core yarn strongly affects the elongation characteristic of the bulky yarn, it is preferable to use an elastic fiber as the core yarn. Examples of the elastic fiber include fibers containing polytrimethylene terephthalate, polybutylene terephthalate and thermoplastic polyurethane, and fibers using each component alone are preferable. In particular, when worn in an elongated state, fibers made of thermoplastic polyurethane are preferable from the viewpoint of reducing the feeling of tightening as much as possible and expressing the wearing comfort of a soft tactile sensation.

  Synthetic fibers used in the present invention are various additives such as inorganic materials such as titanium oxide, silica and barium oxide, carbon black, colorants such as dyes and pigments, flame retardants, fluorescent brighteners, antioxidants, and ultraviolet absorbers. An agent may be included.

  As illustrated in FIG. 1, the bulky yarn of the present invention is composed of a sheath yarn 1 that forms a loop and a core yarn 2 that substantially fixes the sheath yarn by crossing the sheath yarn. Yes.

  Please refer to FIG. The core yarn is preferably a filament and is present in the range from the processed yarn center line 3 to 0.6 mm. The processed yarn center line means a straight line connecting the yarn path guide 4 when the processed yarn is threaded at a constant length between the pair of yarn path guides 4. A filament having a distance 5 from the processed yarn center line of 0.6 mm or less becomes the core yarn in the present invention, and becomes a support yarn for the loop of the sheath yarn. Moreover, it is preferable that the sheath yarn is a filament and protrudes in a loop shape with a distance 5 from the processed yarn center line of 1.0 mm or more. The sheath yarn is responsible for the bulkiness of the yarn of the present invention. In the present invention, the core yarn fixes the sheath yarn forming the loop.

  This intersection point has a role of supporting a loop made of sheath yarn, which is a feature of the present invention, and it is preferable that the intersection point exists at a certain period in terms of securing bulkiness. On the other hand, when the crossing points are densely present, the crossing points come into contact with each other while the core yarns are repeatedly deformed and recovered, and the sheath yarns become entangled, which may be an inhibition point for the core yarns. is there. Therefore, it is preferable that the intersection point of the core yarn and the sheath yarn in the bulky yarn is present at 0.1 to 15.0 pieces / mm per 1 mm of the bulky yarn. If it is such a range, it means that there is a loop made of sheath yarn with an appropriate interval, and does not hinder stretchability (elongation deformation / recovery). In addition, this intersection point is a starting point for periodically securing the deformation amount (loop length) of the sheath yarn that can be deformed following the elongation deformation of the core yarn, so that it is preferable to exhibit good stretch properties as a bulky yarn. As such a range, it is more preferable that the intersection point is 1.0 to 10.0 / mm.

  In order to determine the core yarn and the sheath yarn, and to continuously evaluate the intersection point and the number of loops per unit length in the longitudinal direction of the bulky yarn, a photoelectric fluff detection device can be used. For example, a photoelectric fluff measuring machine (TORAY FRAY COUNTER) is used to evaluate distances of 0.6 mm and 1.0 mm from the center line of the processed yarn under conditions of a yarn speed of 10 m / min and a running yarn tension of 0.1 cN / dtex. .

  The sheath yarn having the loop of the present invention has a form protruding in the cross section of the bulky yarn viewed from the longitudinal direction of the bulky yarn, and forms a large loop as compared with a general interlaced yarn or taslan yarn. ing.

  The size of the loop here refers to the distance 5 from the processed yarn center line 3 shown in FIG. 2 to the apex of each loop. The size of the loop is measured from the observed image of a bulky yarn threaded at a fixed length on a pair of yarn path guides 4. A single bulky yarn selected at random was photographed so that 10 or more loops formed on the bulky yarn could be observed, and the distance from the center line of the processed yarn to the top of the loop was 5 at 10 loops in the image. Measure. This operation is performed for a total of 10 images for one bulky yarn, and the size of a total of 100 loops per bulky yarn is measured to the second decimal place in millimeters. The average value of these numbers was calculated, and the value rounded to the second decimal place was taken as the loop size in the bulky yarn.

  According to the inventor's study, it is preferable that the size of the loop protrudes in the range of 1.0 mm or more and 100.0 mm or less from the center line of the processed yarn, and in such a range, coupled with the crimped structure of the sheath yarn. The bulkiness and the effect of suppressing entanglement, which are the objects of the present invention, are improved. Moreover, when considering the workability to a bulky yarn described later, 3.0 mm or more and 70.0 mm or less is more preferable. Also, considering that repeated deformation and recovery are repeated, if the loop is too large, when the crossing point with the core yarn moves in the fiber axis direction of the core yarn, the follow-up in the same direction of the sheath yarn loop apex is delayed. Is likely to occur. At that time, the loop vertices that are delayed in contact may come into contact with each other to cause entanglement of the sheath yarn, which may hinder the recovery of the core yarn from extension and deformation. Therefore, the size of the loop is particularly preferably 5.0 mm or more and 60.0 mm or less.

  The shape of the loop composed of the sheath yarn is preferably a kurnodal type loop (teardrop shape) rather than an arch type loop formed by general entanglement. The bulky yarn of the present invention has few intersection points between the core yarn and the sheath yarn, and by suppressing the fixing force of the sheath yarn at the intersection point, the loop made of the sheath yarn can move with a degree of freedom, and the core yarn To fully exhibit the recovery of elongation deformation. It is important to have a deformation amount of the sheath yarn that can maximize the elongation deformation of the core yarn and follow the elongation deformation of the core yarn. From this viewpoint, the knurled loop is easier to secure the deformation amount of the sheath yarn per unit length of the core yarn.

  Also, the crossing point moves when compression deformation is applied to the bulky yarn of the present invention. The core yarn used for the bulky yarn of the present invention is stretched and deformed with low stress, that is, the core yarn is moved by the friction when the intersection point with the sheath yarn tries to move in the fiber axis direction of the core yarn. It is easy to follow. For this reason, it can be extended and deformed in a state where the intersection point is substantially fixed, and has excellent characteristics in terms of restoring bulkiness after compression deformation.

  In addition, it is preferable that the sheath yarn has a three-dimensional crimped structure from the viewpoint of suppressing entanglement between the sheath yarns, and by adopting this, it is possible to dramatically increase the bulk due to the synergistic effect with the loop shape. It has also been found that expression is possible.

  When the loop made of the sheath yarn is broken or partially deteriorated in the middle, the above-described effect tends to be lowered. For this reason, the sheath yarn is not substantially broken in the present invention in order to achieve the contradictory properties of suppressing bulkiness and entanglement which are not present in the past. In particular, it is preferable that the material is not substantially broken in the middle of the loop.

  In the present invention, the determination of loop breakage is made at 10 points randomly selected from one processed yarn consisting of a sheath yarn and a core yarn, from the intersection point of the core yarn and the sheath yarn to the next intersection point (that is, one Loop) is photographed and observed at a magnification at which 10 or more points can be confirmed in the longitudinal direction of the processed yarn. In 10 photographed images, the breaking point of the sheath yarn per millimeter of bulky yarn was counted for each of 10 loops. The loop break points counted were averaged, and the second decimal place was rounded off to obtain the loop break point (pieces / mm). Here, the number of broken points on the average of 100 loops is 0.2 pieces / mm or less, and the sheath yarn referred to in the present invention is not substantially broken, in other words, in the length of the bulky yarn. The sheath yarn is almost continuous. Within such a range, the sheath yarn having a free yarn end does not substantially exist, and a loop that does not entangle with other sheath yarn can be formed.

  When a conventional twisting process is applied after adding the actual twist, or when the air is disturbed and opened in the nozzle by powerful air injection, the running yarn is struck inside the nozzle made of metal at a high frequency and breaks. Or may deteriorate. Further, when trying to form a loop, it is necessary to rub between rubber discs or the like and to untwist, so that the sheath yarn is broken or the mechanical properties are greatly reduced. For this reason, the broken sheath yarn is wound around or entangled with other sheath yarns to promote the fastener effect, and it is considered that the result is that the structural form of the yarn and higher-order processing are restricted. In the present invention, this point is greatly improved, and as described above, the effect of weaving the sheath yarn having three-dimensional crimps can be sufficiently exhibited.

  The sheath yarn that controls bulkiness has a three-dimensional crimped structure, and continuously forms a loop without substantially breaking. The three-dimensional crimped structure in the present invention is that the filament single yarn has a spiral structure as illustrated in FIG.

  In this three-dimensional crimp evaluation, 10 or more sheath yarns are selected at 10 locations randomly selected from bulky yarns, and the crimped form of each sheath yarn can be confirmed with a digital microscope or the like. Evaluate by observing at magnification. In this image, when the observed sheath thread has a spirally swung form, it is determined that it has a three-dimensional crimped structure. It is determined that it does not have.

A fiber having such a three-dimensional crimped structure similar to a spring has a restoring force against stretching deformation and compression deformation. The bulky yarn of the present invention has resilience because the sheath yarn has this structure. When the bulky yarns of the present invention are combined and filled between fabrics as yarn bundles, the unique resilience woven by the bulky yarns of the present invention expresses the good tactile feel of the filling and repeats compression recovery. Since the sheath thread that supports the spring is restored like a spring even when added, it is also suitable from the viewpoint of restraint. The size of a three-dimensional crimp having a latent crimp yarn obtained by a general production method such as a conventional side-by-side composite fiber or hollow fiber is generally on the order of microns (10 ⁻⁶ m). In this invention, in order to improve the effect, it is preferable that it is a millimeter order (10 ^<-3> m) larger than it. In the present invention, the bulkiness and resilience of the cross section of the bulky yarn viewed from the longitudinal direction of the bulky yarn can be freely controlled by the size of the three-dimensional crimp, and naturally this resilience is utilized. Thus, it is possible to suppress entanglement of the sheath yarns, which is one of the objects of the present invention. In particular, by setting the size of the crimp to the millimeter order, the entanglement between the sheath yarns is suppressed while the bulkiness and compressibility of the sheath yarns are compatible.

  In the sheath yarn of the present invention, it is preferable that the radius of curvature of the spiral structure swirling spirally is in the range of 2.0 to 30.0 mm. As used herein, the radius of curvature of the spiral structure is the same method as that used to determine the presence or absence of the three-dimensional crimp described above, and an image that is observed two-dimensionally by a digital microscope or the like is used. As shown in FIG. 3, the radius of the curvature 6 formed by the fiber having a spiral structure is defined as the radius of curvature. At 10 locations randomly selected from the bulky yarn, 10 or more sheath yarns are collected, and each sheath yarn is observed with a digital microscope or the like at a magnification that allows confirmation of the crimped form, for a total of 100 sheaths. Measure the yarn to the second decimal place in millimeters. A simple average of these measured values was calculated, and a value rounded to the first decimal place was taken as the radius of curvature of the three-dimensional crimped structure.

  The radius of curvature is more preferably 3.0 to 25.0 mm. If it is in such a range, the sheath yarns will be in contact with each other at a point while having a moderate repulsion feeling against the compression of the bulky yarn to the cross section viewed from the longitudinal direction of the yarn. A certain bulkiness will be exhibited. Furthermore, it is especially preferable that it is 5.0-20.0 mm. In such a range, it is possible to prevent the sheath yarn from being caught by the core yarn when the sheath yarn slides between the single yarns of the core yarn when the core yarn is extended and deformed, and the loop is expanded. Flexible stretching is possible without hindering the elongation of the film. In addition, there is no problem with the long-term durability of the bulkiness that is manifested by the crimped form of the sheath yarn, and in particular, a portable, thin heat-retaining material that is required to be stored in a compact manner in addition to the inner garment worn in an expanded state However, the effects of the present invention are effective.

  This is because the single yarn itself has a three-dimensional solid shape and has a spiral or a similar structure to the two-dimensional bending of the single yarn that can be applied by mechanical pushing. If these crimped forms are micron order and fine crimps, the fine spiral structures bite each other, which facilitates the fastener effect.

  On the other hand, in order to achieve the entanglement suppression of the bulky yarns, which is one of the problems, the inventors focused on the form of the single fiber and pushed forward the examination. As a result, it has been found that when the sheath yarn is composed of a single yarn having a three-dimensional crimp of the millimeter order, a phenomenon completely opposite to the conventional recognition occurs. This is because the sheath yarn has a three-dimensional crimp of the millimeter order, and even when it is a yarn bundle, the bulky yarns have a suitable excluded volume, and the sheath yarns are bitten by each other. This is thought to have been largely suppressed. That is, the sheath yarn of the bulky yarn of the present invention has a space that can move depending on the size of the loop, and according to the definition of the present invention, the loop has a radius of 2.0 mm around the intersection point. The above hemispherical relatively large movable space is provided. In this case, sheath yarns with three-dimensional crimps that are overwhelmingly large with respect to the fiber diameter come in contact with each other at points and repel each other, so one sheath yarn exists independently without entanglement can do. In addition, in the sheath yarn having a three-dimensional crimp, in addition to the movement space described above, the sheath yarn itself can further extend like a spring in the fiber axis direction, so that when the sheath yarn crosses, vibration occurs. It can be easily solved by adding.

  Furthermore, the three-dimensional crimp of the sheath yarn works effectively from the viewpoint of bulkiness, which is a basic characteristic of the present invention. The point contact between the sheath yarns described above has an effect of repelling the sheath yarns even within one bulky yarn, and in addition to the initial bulkiness, the state in which the loop composed of the sheath yarns is radially opened is time-consuming. It can be maintained over time. The spring-like behavior of the sheath yarn of the present invention is difficult to achieve with conventional straight sheath yarns.

  The morphological feature that the sheath yarn of the present invention forms a loop and has a three-dimensional crimped structure also has an effect on lowering the friction coefficient. As described above, this is an effect of contact with other points, and is one of the effects of the bulky yarn having the unique structure of the present invention. In the study by the present inventors, it is preferable that the inter-fiber static friction coefficient is 0.3 or less in order to suppress entanglement between bulky yarns while having bulkiness. The inter-fiber static friction coefficient referred to here is measured by a radar type friction coefficient tester according to the method described in “Friction coefficient” of “Test method for chemical fiber staples” in JIS L 1015 (2010). . In addition, since the JIS is intended for stapling, it prescribes that pre-operation such as opening is performed for measurement, but in the measurement of the present invention, processing such as opening is not performed, and a bulky yarn is used. It can be evaluated by arranging them in parallel with a cylindrical sliver.

  In addition, since the crossing point with the sheath yarn needs to be appropriately slipped in order to sufficiently exhibit the elongation deformation characteristics of the core yarn made of the elastic fiber used in the bulky yarn of the present invention, the inter-fiber static friction coefficient is The lower one is suitable, more preferably 0.2 or less, and particularly preferably 0.1 or less.

  Further, from the viewpoint of appealing a superior tactile sensation with the bulky yarn of the present invention, the single yarn fineness ratio (sheath / core) of the sheath yarn and the core yarn is preferably in the range of 0.1 to 2.0. Within such a range, the fineness of the sheath yarn and the core yarn are close to each other, and it can be used without feeling a sense of foreign matter when compressed. Moreover, when the shape of the textile product follows the movement of the body and tries to adapt (elongation deformation), a flexible tactile sensation can be obtained without a sense of incongruity. The single yarn fineness ratio (sheath / core) is more preferably 0.2 to 1.0.

  Further, in the bulky yarn of the present invention, it is possible to combine various fibers, but even in a state where the crossing point is widened when the core yarn is stretched and deformed, a certain amount of bulkiness is expressed. The sheath yarn is preferably a fiber having excellent rigidity. Specifically, a fiber containing polyethylene terephthalate, polytrimethylene terephthalate, or polybutylene terephthalate as a main component is preferable, and it is more preferable that these are composed of one kind of polymer. From the viewpoint of softening the tactile sensation as the bulky yarn of the present invention, it is preferable to use a fiber having an appropriate stretch property for the sheath yarn, and it is further a fiber made of polytrimethylene terephthalate. preferable.

  The bulky yarn of the present invention has excellent bulkiness, and it is preferable that the yarn constituting the bulky yarn has an appropriate resilience. In view of the problem to be solved by the present invention, the single yarn fineness of the synthetic fiber constituting the bulky yarn is preferably 3.0 dtex or more. In the case of stuffing, since deformation such as repeated compression recovery can be applied, the constituting filaments should preferably have appropriate rigidity, and the single yarn fineness is more preferably 6.0 dtex or more. . The fineness referred to here means a value calculated from the obtained fiber diameter, the number of filaments and the density, or a value obtained by calculating a mass 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. To do.

  The bulky yarn of the present invention has a 10% modulus of less than 1.5 cN / dtex. The 10% modulus referred to here is the stress when 10% elongation strain is applied. The stress-strain curve of the bulky yarn is obtained under the conditions shown in JIS L1013 (1999), and 10% strain is added. It is calculated by dividing the load at the time of cutting by the fineness of the core yarn. This operation is evaluated for 5 samples for each level, a simple average value of the obtained results is obtained, and the value is obtained by rounding off the second decimal place.

  This 10% modulus represents a resistance value at the time of initial elongation deformation of the bulky yarn. If this value is too high, it means that the bulky yarn is not easily stretched and deformed flexibly. On the other hand, when the stress is less than 1.5 cN / dtex, it means that the bulky yarn can be deformed flexibly from the initial stage of deformation, and the flexibility at the stretch which is the object of the present invention is ensured and the comfort is improved. It means that the discomfort such as the feeling of pressure or tension given to the body is reduced. For example, when sewing on a jacket, it is naturally preferable to change the characteristics of the sample as appropriate depending on the site, but stress on the elongation of materials such as the neck, cuffs, and elbows In order to enhance the heat retaining effect while suppressing the uncomfortable pressure feeling imparted by the material, it is preferable that the stress required for the extensional deformation is low for a portion that requires packing and fitting properties, and the 10% modulus is 1 It is preferably less than 5 cN / dtex. More preferably, it is less than 1.0 cN / dtex, and still more preferably less than 0.5 cN / dtex. The practical lower limit for the 10% modulus in the present invention is 0.1 cN / dtex.

Moreover, as important requirements for achieving the object of the present invention, it is important that the load application fiber elongation ratio of the bulky yarn is 1.1 or more, and the fiber length recovery rate after the application of load is 80 to 100%. is there. The load application fiber elongation ratio mentioned here can be calculated from a change in the sample length before and after the load application and extension by applying a predetermined load to the sample collected at a specific length. That is, 5 m of a bulky yarn is sampled with a 1 m / circumference hook, and one end of the hook is hooked and hung, and an initial load per sample fineness of 0.03 cN / dtex is applied to measure the original length (L0) before applying the load. . Next, after removing the initial load and applying a load of 1.5 times the 10% modulus of the sample and leaving it to stand for 1 minute, the sample length (L1) at the time of applying and extending the load was measured, Find the ratio. It is a value obtained by evaluating the same operation for five samples for each level, obtaining a simple average value of the obtained results, and rounding off to the second decimal place.
Load application elongation ratio = L1 / L0
[L0: Original length (cm) before elongation with load application, L1: Length (cm) when elongation with load application]
Subsequent to the measurement of the load application elongation ratio, after removing the extension load, the sample length (L2) after the application of the initial load is applied to measure the length (L2) after the application of the load, and the fiber length recovery rate after the application of the load is calculated by the following formula. Ask for. The same operation is evaluated for 5 samples for each level, a simple average value of the obtained results is obtained, and the values after the decimal point are rounded off.
Fiber length restoration rate after load application elongation (%) = (L1-L2) / (L1-L0) × 100
[L0: Original length (cm) before elongation with load application, L1: Length (cm) when elongation with load application, L2: Length (cm) after elongation with load application].

  The bulky yarn of the present invention can exert its effect to a full extent, particularly when utilized in a site where packing properties are demanded in an elongated state, and the load application elongation ratio is 1.1 or more. It means that the fiber stretches even at a low stress to a high degree, and that the fiber length recovery rate after applying a load is 80% or more means that the shape recoverability after stretching is excellent. In applications where the bulky yarn of the present invention is used, in addition to wearing in a stretched state, in order to express stretch properties without discomfort such as a feeling of pressure or tension with respect to movement during wearing, high elongation with low stress is required. It is suitable that it is excellent in recoverability after stretching while being expressed. If this viewpoint is pushed forward, the higher the load-applying elongation ratio mentioned here and the higher the fiber length restoration rate, the closer to rubber elastic deformation, and the more excellent the stretchability and elongation deformation.

  The upper limit of the load application elongation ratio in the present invention is the point where the sheath yarn forming the loop of the bulky processed yarn is fully extended, and the substantial upper limit is 20.0. Moreover, the substantial upper limit of the fiber length restoration rate after load application is 100%.

  The bulky yarn of the present invention is used for general clothing such as inner and outer clothing, bedding such as bedding and pillows, sleepwear, clothing for the sick and maternity clothing, and the tightening feeling is reduced as much as possible. The load application elongation ratio should be 1.5 or more in order to use it suitably in applications that require shape following properties such as a feeling of fit to the body in order to enhance the effect of heat retention while achieving a soft tactile sensation. Is more preferably 2.0 or more. In addition, when used as a material excellent in form recoverability such as recovering to its original form even after being stored compactly, the fiber length restoration rate after applying a load is more preferably 90% or more, and still more preferably. 95% or more.

  When the crimp of the core yarn in the bulky yarn of the present invention is strong, when the core yarn is stretched, the crimped portion of the core yarn spreads the intersection point with the sheath yarn, and the intersection points are likely to contact each other. For this reason, the fact that the core yarn is substantially uncrimped is mentioned as one means for easily achieving the fiber length recovery rate.

  The bulky yarn of the present invention preferably has a breaking strength of 0.5 to 10.0 cN / dtex and an elongation of 5% to 700%. The strength referred to here is a value obtained by obtaining a load-elongation curve of the yarn under the conditions shown in JIS L1013 (1999) and dividing the load value at break by the initial fineness. The elongation is a value obtained by dividing the elongation at break by the initial test length. Further, the breaking strength of the bulky yarn of the present invention is preferably 0.5 cN / dtex or more in order to be able to withstand the process passability and actual use of the high-order processing step, and the upper limit that can be implemented. Is 10.0 cN / dtex. Further, the elongation is preferably 5% or more in consideration of the processability of the post-processing process, and the upper limit that can be implemented is 700%. The breaking strength and elongation can be adjusted by controlling the conditions in the production process according to the intended application. When the bulky yarn of the present invention is used for general clothing such as inner and outer clothing or bedding such as a futon or pillow, the breaking strength is preferably 0.5 to 4.0 cN / dtex. Moreover, it is preferable to set the breaking strength to 1.0 to 6.0 cN / dtex in sports clothing applications where the usage situation is relatively severe. Further, the elongation is preferably 30 to 500%.

  The core yarn and / or sheath yarn used in the present invention is preferably a hollow cross-section fiber. Further, the fiber having a three-dimensional crimped structure is more preferably a hollow cross-section fiber. This is because there is an advantage that the size of the three-dimensional crimp can be manufactured relatively freely from a large one to a small one.

  From the viewpoint of loop protrusion, hollow cross-section fibers are also preferable. The reason will be described below. In the bulky yarn of the present invention, the loop made of the sheath yarn starts from the crossing point with the core yarn, and can protrude due to the rigidity of the sheath yarn. Furthermore, considering the prevention of settling, it is preferable that the mass of the sheath yarn itself is also small. For this reason, from the viewpoint of lightness of the sheath yarn, a hollow cross-section fiber having a hollow ratio of 20% or more is preferable. The hollow ratio here is a volume ratio of a portion where no material is present in the fiber.

  For example, it can be measured by the following method. After the sheath yarn or the core yarn is cut so that the cross section can be observed, the fiber cross section is photographed at a magnification at which the cross section of 10 or more fibers can be observed with an electron microscope (SEM). Ten randomly selected fibers are extracted from the photographed image, the equivalent circle diameters of the fibers and the hollow portion are measured using image processing software, and the area ratio of the hollow portion is calculated therefrom. The above operation is performed on 10 images taken, and the average value of the 10 images is defined as the hollow ratio of the hollow cross-section fiber of the present invention.

In the case of a circular hollow fiber, there are the following simple methods for evaluating the hollow ratio.
The side surface of the hollow cross-section fiber is observed with an enlarging means such as a microscope, and the fiber diameter in terms of a round cross section is measured from the image. From the fiber diameter and the density of the fiber material, the ratio of the actually measured fineness to the fineness when the fiber is not hollow can be calculated as the hollow ratio.

  From the viewpoint of light weight and heat retention, which is the object of the present invention, the hollowness ratio is preferably such that the bulky yarn of the present invention contains more air, and the hollowness ratio is more preferably 30% or more. Within such a range, when the bulky yarn is held in a bundle, it is possible to realize better lightness. Moreover, since it means having more air with low heat conductivity inside, heat retention can be improved further. From this point of view, it can be said that the higher the hollowness ratio, the better. However, the hollowness is 50% as a range in which the hollow portion can be stably produced without collapsing in the yarn production process or the fluid processing process described later. The following is preferred.

  The bulky yarn of the present invention can be made into various fiber products such as fiber winding packages, tows, cut fibers, cotton, fiber balls, cords, piles, woven and knitted fabrics, and non-woven fabrics. Textile products here are used for daily use such as general clothing, sports clothing, clothing materials, interior products such as carpets, sofas, curtains, vehicle interiors such as car seats, cosmetics, cosmetic masks, wiping cloths, health products, etc. It can be used for environmental and industrial materials such as filters and hazardous substance removal products. In particular, the bulky yarn of the present invention is preferably used as a batting because of its bulkiness and entanglement being suppressed. In this case, since the batting is filled in the side fabric, it is preferable to form several to several tens of yarn bundles or a sheet-like material such as a nonwoven fabric. In particular, when it is made into a sheet, it is easy to fill the side ground, and it is easy to adjust the filling amount according to the application. For this reason, it becomes a thin, lightweight, heat-insulating material, and there is no need to worry about getting out of the side, and there is no need to sew unnecessarily, so there is no restriction on the form of the textile product, and complex designs etc. are possible Become.

Hereinafter, an example of the method for producing the bulky yarn of the present invention will be described.
The core yarn and sheath yarn used in the present invention may be synthetic fibers obtained by fiberizing a thermoplastic polymer by a melt spinning method.

  The spinning temperature of the synthetic fiber used in the present invention is a temperature at which the polymer used exhibits fluidity. The temperature showing the fluidity varies depending on the molecular weight, but the melting point of the polymer is a guideline, and may be set at a melting point or higher and a melting point + 60 ° C. or lower. A melting point of + 60 ° C. or lower is preferable because the polymer is not thermally decomposed in the spinning head or the spinning pack and the molecular weight reduction is suppressed. Further, the discharge amount is generally 0.1 g / min / hole to 20.0 g / min / hole per discharge hole as a range in which discharge can be stably performed. At this time, it is preferable to consider the pressure loss in the discharge hole that can ensure the stability of the discharge. The standard of the pressure loss is preferably in the range of 0.1 MPa to 40 MPa, and can be adjusted by the melt viscosity of the polymer to be used, the specification of the discharge hole, and the discharge amount.

  The molten polymer discharged in this manner is cooled and solidified, applied with an oil agent, and taken up by a roller to become fibers. Here, the take-up speed may be determined from the discharge amount and the target fiber diameter, but it is preferable to set the take-up speed in the range of 100 to 7000 m / min for stable production. This synthetic fiber may be stretched after being wound once, or may be continuously stretched without being wound once, from the viewpoint of improving the mechanical properties with high orientation. As the stretching conditions, for example, in a stretching machine composed of a pair of rollers or more, in general, in the case of a polymer that can be melt-spun, a first roller set to a glass transition temperature or higher and a second roller set to a crystallization temperature or higher are used. After being stretched by the peripheral speed ratio (second roller / first roller), it is wound by a winder. In the case of a polymer that does not exhibit a glass transition, dynamic viscoelasticity measurement (tan δ) of the composite fiber is performed, and a temperature higher than the temperature of the peak of the temperature / tan δ curve (the highest temperature when there are multiple) is reserved. What is necessary is just to employ | adopt as 1st roller temperature as heating temperature. Here, from the viewpoint of increasing the stretching ratio and improving the mechanical properties, it is also a suitable means to perform this stretching step in multiple stages.

  The cross-sectional shape of the synthetic fiber of the present invention is not particularly limited, and by changing the shape of the discharge hole in the spinneret, a general round cross section, a triangular cross section, a Y type, an eight leaf type, a flat type Etc., multi-leaf type, hollow type, etc. Moreover, it does not need to consist of a single polymer, and may be a composite fiber composed of two or more types of polymers. However, from the viewpoint of expressing the three-dimensional crimp of the sheath yarn, which is an important requirement of the present invention, among the above, a side-by-side type composite fiber in which a hollow cross section and two kinds of polymers are bonded is used. Is appropriate. In these fibers, a three-dimensional crimp can be expressed due to the presence of foreign substances in the cross section of the single fiber by performing a heat treatment after the yarn production and the yarn processing. For this reason, at the time of fluid processing, which will be described later, although it is a so-called straight fiber, a three-dimensional crimp is developed by performing a heat treatment after passing through a loop forming step with a sheath yarn.

  If the fiber is straight during bulky processing, the yarn can easily run stably without causing yarn clogging with a nozzle or the like. Further, in forming the loop of the present invention, the core yarn and the sheath yarn are efficiently swung, and each loop has a very close shape in the fiber axis direction of the processed yarn. By heat-treating the processed yarn having this loop with the crystallization temperature of the polymer as a guide, the sheath yarn expresses a three-dimensional crimp and becomes a bulky yarn. This three-dimensional crimp of the sheath yarn expresses good bulkiness in both the circumferential direction and the cross-sectional direction of the processed yarn, and is suitably controlled according to the desired characteristics. is there.

  From the viewpoint of controlling the degree of crimp development after the heat treatment, the fiber used is more preferably a hollow cross-section fiber made of a single component polymer. In the case of a hollow cross-section fiber, it has an air layer with low thermal conductivity at the center of the fiber. For this reason, for example, after discharging from a spinneret that can form a hollow cross section, one side is forcibly cooled with excessive cooling air or the like, or one side is excessively heat treated with a heating roller or the like during stretching, so that the fiber cross-sectional direction This creates a structural difference. In the case of hollow cross-section fibers made of a single component polymer, in addition to being capable of spinning with a single spinning machine, three-dimensional crimps can be obtained relatively easily from a large size to a small size by the operations described above. It is possible. For this reason, it is suitable for use in the present invention, and it is particularly preferable that the hollowness is 20% or more, and further 30% or more as described above from the viewpoint of crimp control by the above-described operation.

Next, an example of a method for producing a bulky yarn from the fiber obtained by spinning will be described.
The method for producing a bulky yarn exemplified here mainly comprises two steps. The first step is a bulky process in which a core yarn and a sheath yarn are crossed with a fluid to form a loop made of the sheath yarn. The second step is a heat treatment step in which a three-dimensional crimp is developed in the sheath yarn by heat treating the bulky processed yarn.

  An example of the method for producing a bulky yarn of the present invention will be described based on the schematic process diagram of FIG. In this first step, a synthetic fiber as a raw material is drawn by a specified amount by a supply roller 14 having a nip roller or the like, and sucked as a core yarn and a sheath yarn by a suction nozzle 7 capable of jetting compressed air.

  In this suction nozzle 7, the flow rate of the compressed air injected from the nozzle is such that the yarn inserted from the supply roller into the nozzle has the minimum necessary tension, and does not cause yarn fluctuation or the like between the supply roller and the nozzle. What is necessary is just to inject the flow volume which travels stably. The optimum amount of this flow rate varies depending on the hole diameter of the suction nozzle to be used, but the range in which the yarn tension can be applied and the loop formation described later can be smoothly formed has an air velocity of 100 m / s or more in the nozzle. It becomes a standard. A guideline for the upper limit value of the air flow speed is 700 m / s or less, and if it is within such a range, the traveling yarn does not cause yarn swaying due to excessively injected compressed air, and the nozzle can be stably formed. You will be traveling inside.

  Further, from the viewpoint of preventing disturbance and opening of the processed yarn in the suction nozzle, the jet angle of the compressed air (17 in FIG. 5) is less than 60 ° with respect to the traveling yarn. It is preferable that This is because loop formation by sheath yarn can be performed uniformly with high productivity. Naturally, it is not impossible to produce the bulky yarn of the present invention by the vertical jet flow in which the fluid is injected at 90 ° to the traveling yarn, but the traveling yarn is opened by the jet flow injection from the vertical direction. From the viewpoint of suppressing entanglement between single yarns in a narrow space inside the nozzle and the nozzle, processing by a propulsion jet is preferable. The processing by this propulsion jet can also suppress the formation of short arch-shaped loops that are easy to form in the case of a vertical jet.

  In order to form a loop composed of a sheath yarn necessary for the bulky yarn of the present invention, it is preferable that no disturbance or fiber opening is performed in the suction nozzle. From the viewpoint of running a multifilament made of single-digit to double-digit yarns without opening them in the nozzle, the jet angle of compressed air is more preferably 45 ° or less with respect to the running yarn. . Furthermore, in order to form a loop outside the nozzle, which will be described later, it is preferable that the stability and propulsive force of the jet airflow immediately after the nozzle is high. From this viewpoint, the jet angle is 20 ° or less with respect to the traveling yarn. It is particularly preferred that

  The yarn guided to the suction nozzle may be performed with one feed or with two feeds, but it is preferable to perform the processing with two feeds in order to produce the bulky yarn of the present invention. The term “two feeds” as used herein refers to a method in which the core yarn and the sheath yarn are supplied to the nozzle with different supply speeds (amounts) using different supply rollers. By utilizing the swirl force generated by the airflow described later, the excessively supplied yarn becomes a sheath yarn and forms a loop.

  When using these two feeds, a loop can be formed in the nozzle by using an interlacing nozzle or taslan processing nozzle that imparts the effect of disturbance, opening and entanglement to the running yarn in the nozzle. It's not impossible. However, in the processed yarn obtained by these processing nozzles, in addition to the loops being easily formed in a short period, the size is likely to be small.

  For this reason, in order to produce a bulky yarn that satisfies the object of the present invention, it is necessary to precisely control many existing parameters. In addition, when the number of spindles is increased, the bulkiness of the bulky yarn may differ from one spindle to another, so a method that utilizes airflow control outside the nozzle, which will be described later, is also used from the viewpoint of quality stability. It is preferable to do. In this regard, it was considered that the disturbance and the opening process in the nozzle were not positively applied.

  Next, the yarn to which compressed air is applied is swirled outside the nozzle to form a loop of sheath yarn. This is based on the concept that a loop can be formed by swiveling two yarns supplied at positions away from the nozzle. When the ratio of the air velocity to the yarn velocity (air velocity / yarn velocity) is in the range of 100 to 3000, a unique phenomenon has been found in which the sheath yarn rotates while opening outside the nozzle.

  The airflow velocity here means the velocity of the airflow injected along with the traveling yarn from the suction nozzle outlet. This speed can be controlled by the discharge diameter of the nozzle and the flow rate of the compressed air. Further, the yarn speed can be controlled by the rotating speed of a roller for picking up the yarn after the fluid processing nozzle. Since the turning force of the traveling yarn increases and decreases depending on the speed ratio between the air current and the yarn, the speed ratio should be close to 3000 when the intended intersection of bulky yarns is to be strengthened. If it is desired to make the intersection point slow, it may be close to 100. For example, the speed ratio can be changed in the degree of intersection by changing the flow rate of the compressed air intermittently or by changing the speed of the take-up roller. On the other hand, when the bulky yarn of the present invention is used for applications such as stuffing where deformation of compression recovery is repeatedly applied, the air velocity / yarn velocity is preferably 200 to 2000. In particular, when producing a bulky yarn used for apparel such as a jacket that undergoes deformation at a high frequency, the air velocity / yarn velocity is set to 400 to 1500 from the viewpoint of imparting appropriate restraint and flexibility. Particularly preferred.

This turning force is manifested when the accompanying airflow has left the running yarn. Therefore, a turning point 10 for changing the yarn path is arranged. Specifically, the yarn path may be changed with a bar guide or the like. Then, by pulling the yarn at a prescribed speed, the sheath yarn turns around the core yarn to form a loop. From the viewpoint of obtaining the loosening due to the vibration of the sheath yarn using the space for causing the swirling and the diffusion of the airflow injected from the nozzle, the swiveling point of the running yarn may be at a position away from the nozzle discharge port. Is preferred. However, the nozzle suitable for producing bulky yarn of the present invention - the distance between the pivot point is one that varies with air velocity ejected, ejection air flow 1.0 × 10 ^-5 from 1.0 × 10 ^- It is preferable that the turning point 10 is present while traveling for ³ seconds. In order to form the intersection of the core yarn and the sheath yarn at an appropriate period in balance with the diffusion of the air flow, the distance between the nozzle and the turning point is 2.0 × 10 ⁻⁵ to 5.0 × More preferably, it is present while traveling for ^10-4 seconds.

  By adjusting the position of the turning point, the period of the intersection point of the bulky yarn of the present invention can be controlled. The crossing point has a role of supporting the independence of the loop composed of the sheath yarn, which is a feature of the present invention, and it is preferable that the crossing point exists at a certain period. From this point of view, it is preferable to adjust the turning point so that the crossing point of the core yarn and the sheath yarn in the bulky yarn is 0.1 to 15.0 pieces / mm. Such a range is preferable because the loops exist at an appropriate interval even after the three-dimensional crimp of the sheath yarn is expressed. From this point of view, it is more preferable to adjust the turning point so that the intersection point is 1.0 to 10.0 / mm.

  The processed yarn 9 (FIG. 4) in which a loop composed of a sheath yarn is formed is preferably subjected to heat treatment after being wound once or subsequent to bulky processing in order to develop form fixation and three-dimensional crimp. . FIG. 4 illustrates a processing step in which heat treatment is performed subsequent to the loop formation step.

  This heat treatment is performed by, for example, the heater 11 (FIG. 4). As a guide, the crystallization temperature of the polymer used is ± 30 ° C. If the treatment is performed within this temperature range, the treatment temperature is away from the melting point of the polymer, so there is no part that is fused and cured between the sheath yarns or between the core yarns, there is no foreign matter feeling, and good tactile sensation is impaired. There is nothing. As the heater used in this heat treatment step, a general contact type or non-contact type heater can be adopted, but from the viewpoint of bulkiness before heat treatment and suppression of deterioration of sheath yarn, use of a non-contact type heater is preferable. . Non-contact heaters mentioned here include air heaters such as slit heaters and tube heaters, steam heaters heated by high-temperature steam, halogen heaters using radiant heating, carbon heaters, microwave heaters, etc. To do.

  Here, from the viewpoint of heating efficiency, a heater using radiant heating is preferable. With regard to the heating time, for example, the time for crystallization to progress and the fixation of the fiber structure of the fibers constituting the processed yarn, the fixed shape of the processed yarn, and the crimp expression of the sheath yarn to be completed, etc. will be considered. The processing temperature and time should be adjusted according to the required characteristics. The processed yarn for which the heat treatment process has been completed may be wound up by a winder 13 having a tension control function with the speed regulated via the roller 12 (FIG. 4). The winding shape is not particularly limited, and can be a so-called cheese winding or bobbin winding. In consideration of processing into a final product, it is possible to combine a plurality of yarns in advance to form a tow or to make a sheet as it is.

  The bulky yarn of the present invention preferably has a silicone oil agent uniformly attached before and after the heat treatment step. The silicone to be adhered here is preferably formed by forming a silicone film on the sheath yarn and the core yarn by appropriately crosslinking the silicone by heat treatment or the like. Examples of the silicone-based oil mentioned here include dimethylpolysiloxane, hydrodienemethylpolysiloxane, aminopolysiloxane, and epoxypolysiloxane, which can be used alone or in combination. In addition, in order to form a uniform film on the surface of the bulky yarn, a dispersant, a viscosity modifier, a crosslinking accelerator, an antioxidant, a flame retardant, and an antistatic agent are added to the oil within a range that does not impair the purpose of silicone adhesion. Can be contained. This silicone-based oil can be used without a solvent, or in the form of a solution or an aqueous emulsion. From the viewpoint of uniform adhesion of the oil agent, it is preferable to use an aqueous emulsion. It is preferable to treat the silicone-based oil agent so that it can adhere to the bulky yarn in an amount of 0.1 to 5.0% by using an oil agent guide, an oiling roller or spraying. Thereafter, it is preferably dried at an arbitrary temperature and time for a crosslinking reaction. This silicone-based oil agent can be attached in a plurality of times, and it is also preferable that the same type of silicone or different types of silicones are attached separately to form a strong silicone film. By forming a silicone film on the bulky yarn by the treatment described above, the slipperiness and touch of the bulky yarn are increased, and the effects of the present invention can be further enhanced.

The bulky yarn of the present invention and the effects thereof will be specifically described below with reference to examples.
In the examples and comparative examples, the following evaluation was performed.

A. Fineness The 100-meter mass of the fiber was measured, and the fineness was calculated by multiplying by 100. This was repeated 10 times, and the value obtained by rounding off the second decimal place of the simple average value was defined as the fineness (dtex) of the fiber. The single yarn fineness was calculated by dividing the fineness by the number of filaments constituting the fiber. Also in this case, the value obtained by rounding off the second decimal place was defined as the single yarn fineness.

B. Mechanical properties of fiber (strength, stress when 10% strain is applied)
Using a tensile tester “Tensilon” (registered trademark) UCT-100 type manufactured by Orientec Co., Ltd., the fiber is pulled under the conditions of a sample length of 20 cm and a tensile speed of 100% / min to obtain a stress-strain curve. The breaking strength (cN / dtex) is calculated by reading the load at break and dividing the load by the initial fineness. The 10% modulus was calculated by reading a load with a strain of 10% and dividing by the initial fineness. Each value is a value obtained by evaluating this operation for five samples for each level, obtaining a simple average value of the obtained results, and rounding off to the second decimal place.

C. Load application elongation ratio, elongation recovery rate Take 5m of bulky yarn with 1m / circular casket, hang it by hooking one end of the casserole, apply initial load 0.03cN / dtex per sample fineness, original length before elongation (L0) is measured. Next, after removing the initial load, applying a load of 1.5 times the 10% modulus of the sample and allowing it to stand for 1 minute, the sample length (L1) when the load was applied and extended was measured, The elongation ratio was determined. The same operation was evaluated for five samples for each level, a simple average value of the obtained results was obtained, and a value obtained by rounding off the second decimal place was taken as the load application elongation ratio.
Load application elongation ratio = L1 / L0
[L0: Original length (cm) before elongation with load application, L1: Length (cm) when elongation with load application]
Further, following the measurement of the load application elongation ratio, after removing the extension load, the sample length (L2) after the load application extension is measured by applying the above-mentioned initial load, and the fiber length after the load application extension is calculated by the following formula. The restoration rate was calculated. Also in this case, the same operation was evaluated for 5 samples for each level, a simple average value of the obtained results was obtained, and a value obtained by rounding off the decimal point was taken as the fiber length restoration rate after applying the load.
Fiber length restoration rate after load application elongation (%) = (L1-L2) / (L1-L0) × 100
[L0: Original length (cm) before elongation after load application, L1: Length (cm) during elongation after load application, L2: Length (cm) after elongation after load application].

D. Loop evaluation (size, intersection point, break point)
A load of 0.01 cN / dtex is applied so that no slack is produced on the sample yarn, and the yarn is hooked on the pair of yarn path guides 4 at a constant length as illustrated in FIG. The side surface of the bulky yarn that was threaded was photographed with a microscope VHX-2000 manufactured by Keyence Corporation at a magnification at which 10 or more loops could be observed. The distance 5 (FIG. 2) from the processing thread center line 3 at the tip of the loop to the loop apex was measured using 10 image processing software (WINROOF) for 10 loops randomly selected from this image. For this work, a total of 10 images are taken for one processed yarn, and a total of 100 loops per processed yarn are measured in millimeters up to the second decimal place. The average value of these numbers was calculated, and the value rounded to the second decimal place was taken as the loop size in the bulky yarn.

  In the same 10 images as above, the point where the sheath thread forming the apex of the loop at 1.0 mm or more from the processed thread center line 3 intersects the straight line located 0.6 mm from the processed thread center line 3 is an intersection point, Counted per millimeter of processed yarn. The crossing points (pieces / mm) of a total of 10 images were measured, and the average value was rounded off to the nearest decimal point.

  In the same 10 images as above, 10 break points of the loop were counted per millimeter of processed yarn. The breaking points (pieces / mm) of a total of 100 loops per bulky yarn were measured, and the average value was rounded off to the second decimal place. Here, in the sample having a breaking point of less than 0.2 pieces / mm, the sheath yarn is not substantially broken (“None” in the description of each example, comparative example, and Table 1, Table 2, and Table 3). Description) Those with 0.2 pieces / mm or more were evaluated as having breakage (denoted as “present” in the description of each example and comparative example and in each table).

E. Crimp shape evaluation (presence / absence of three-dimensional crimp, radius of curvature)
At 10 points randomly selected from the processed yarns, observation was carried out with a microscope VHX-2000 manufactured by Keyence Corporation at a magnification at which the crimped form of the single yarn could be confirmed. In these 10 images, when 10 core yarns and 10 sheath yarns are observed and spirally turned (spiral structure), there is a three-dimensional crimped structure (each example) In the description of the comparative example and in Tables 1, 2 and 3, it is determined that “present”). Otherwise, there is no crimped structure (in each example, the description of the comparative example and each table, “ It was determined as “None”. Further, from the same image, the radius of the curved single yarn curve 6 (FIG. 3) was measured using image processing software (WINROOF). As described above, 100 core yarns and 100 sheath yarns selected at random are measured to the second decimal place in millimeters, and the value obtained by rounding off the second decimal place of this simple average is a three-dimensional crimp. The radius of curvature of the structure was used.

F. Coefficient of static friction between fibers It was measured by a method according to JIS L 1015 (2010) using a radar friction coefficient tester. In addition, pre-processing such as fiber opening is not performed, and evaluation is performed by arranging samples in parallel with a cylinder.

G. Unraveling (suppressing effect of fastener phenomenon)
A drum wound with 500m or more of processed yarn is creeled and released in the cross-sectional direction of the drum for 5 minutes at a speed of 30m / min, and the yarn dancing and catching due to the fastener phenomenon is visually confirmed and evaluated in the following four stages. .
A: Yarn dance is not seen and can be solved well.
○: Can be solved without any problem of slight yarn dance.
Δ: Dancing of the yarn and slight catch are seen, but can be unraveled.
×: Yarn dancing and catching occur and cannot be solved.

H. Tactile feeling A drum around which a processed yarn is wound for 500 m or more was placed on a creel, and the yarn was unwound into a winding shape using a measuring machine in the cross-sectional direction of the drum to obtain a 10 m yarn cassette. A sample for texture evaluation was prepared by fixing one portion of the yarn cassette. The tactile sensation when gripping this sample was evaluated according to the following four levels.
(Double-circle): It is excellent in bulkiness and a softness | flexibility, and the outstanding texture which does not feel a foreign material feeling.
○: Good texture with bulkiness and flexibility.
(Triangle | delta): The favorable texture which has a bulkiness and does not feel a foreign material feeling.
X: Poor texture that is not bulky and feels a foreign body.

Example 1
A thermoplastic polyurethane resin was supplied to a spinning device with a single-screw extruder, melted at a spinning temperature of 220 ° C., weighed with a gear pump, and flowed into a spinning pack. Discharge holes with a hole diameter of φ0.30 mm were arranged concentrically. It discharged from the spinneret. The discharged yarn was blown with 20 ° C. cooling air at a flow rate of 20 m / min to cool and solidify, and after applying the spinning oil, the undrawn yarn was wound at a spinning speed of 500 m / min. A fiber having a single yarn fineness of 7.0 dtex obtained by drawing the wound undrawn yarn between heating rollers at a drawing speed of 600 m / min was used as a core yarn.

  Next, polyethylene terephthalate (PET: IV = 0.6 dl / g) was melted at 290 ° C., weighed with a gear pump, and flowed into a spinning pack, and three slits (width 0.1 mm, 18 was discharged from the hollow section discharge holes arranged concentrically so that the hollow ratio was 30%. A 20 ° C. cooling air was blown from one side to the discharged yarn at a flow rate of 30 m / min to cool and solidify, and then a spinning oil was applied, and the undrawn yarn was wound at a spinning speed of 1500 m / min. Subsequently, a hollow fiber having a single yarn fineness of 6.5 dtex obtained by stretching the wound undrawn yarn by 3.0 times at a drawing speed of 800 m / min between rollers heated to 90 ° C. and 140 ° C. was used as a sheath yarn.

The core yarn and the sheath yarn were supplied to the suction nozzle at a supply roller speed of 50 m / min and 1000 m / min in the process illustrated in FIG. In the suction nozzle, compressed air was jetted so that the air velocity was 400 m / s at 20 ° with respect to the running yarn, and jetted from the nozzle together with the accompanying air so that the core yarn and the sheath yarn would not cross. The yarn jetted from the nozzle is run for 1.0 × 10 ^-4 seconds with air flow, the yarn path is changed using a ceramic guide, and the bulky yarn that forms a large loop made of sheath yarn is fed with a roller of 50 m / min. I took it. The processed yarn was continuously guided to a tube heater through a roller and heat-treated with heated air at 150 ° C. for 10 seconds to set a bulky yarn form and to cause crimps in the core yarn and sheath yarn. The bulky yarn was wound around a drum at 52 m / min by a tension control type winder installed after the tube heater.

In Example 1, a large loop made of sheath yarn protruded from the bulky yarn surface by an average of 23 mm, and the large loop was a bulky yarn formed at a frequency of 8.4 pieces / mm. This protruding loop was excellent in uniformity in size and period. In addition, the sheath yarn of the processed yarn has a three-dimensional crimped structure with a radius of curvature of 5.2 mm, and a continuous loop in which no breakage is found in the large loop of the sheath yarn. Met. (Break location: 0.0)
Subsequently, a silicone-based oil containing polysiloxane in a bulky yarn at a concentration of 8 wt% was sprayed uniformly so that the final polysiloxane adhesion amount was 1 wt% with respect to the bulky yarn. The bulky yarn of the present invention was collected by heat treatment for 20 minutes.

In the bulky yarn, the sheath yarn forming a continuous large loop has a three-dimensional crimped structure, the inter-fiber static friction coefficient is 0.2, the unraveling property of the bulky yarn has no problem, and is caught It was possible to unwind from a drum that had been wound smoothly without causing wrinkles (unwinding property: ◎). Further, 10% modulus representing resistance at the time of expansion / contraction is 0.2 cN / dtex, load application elongation ratio is 2.5,
The fiber length recovery rate after load application and elongation was 100%. Example 1 was able to be highly elongated even with a small force, and had a good shape restoring property (texture:）). The results are shown in Table 1.

Example 2
The same procedure as in Example 1 was performed except that the thermoplastic polyurethane fiber having a single yarn fineness of 3.0 dtex was used as the core yarn by adjusting the discharging amount during spinning.

  In Example 2, the frequency of the loop was slightly increased by reducing the single yarn fineness of the core yarn, and it was easily deformed at the time of extension deformation, and the core yarn became thinner compared to Example 1. It was a flexible texture. The results are shown in Table 1.

Example 3
The polymer was changed to a polyester-based elastomer, the spinning temperature was 260 ° C., melt spinning was performed using a spinneret in which discharge holes with a hole diameter of φ0.30 mm used in Example 1 were concentrically arranged, and a core yarn was collected. Except for this, everything was carried out according to Example 1.

  In Example 3, the polymer type of the core yarn was changed to a polyester elastomer excellent in flexibility, and the bulky yarn had a small 10% modulus and was highly stretched and deformed. Further, even when deformed to a relatively high degree, there is no stickiness and the material is suitable for use in a part having a larger movable range. The results are shown in Table 1.

Example 4
The polymer was changed to polytrimethylene terephthalate, the spinning temperature was 275 ° C., melt spinning was performed using a spinneret in which discharge holes with a diameter of φ0.30 mm used in Example 1 were concentrically arranged, and a core yarn was collected. Except for the above, all were carried out according to Example 1.

  In Example 4, the polymer type of the core yarn was changed to 3GT, and the 10% modulus was improved as compared with Examples 1 to 3. In Example 4, the core yarn functions so as to support the return movement of the body during recovery after deformation while having a flexible stretch property. For example, the working amount of expansion and contraction is small. It was a material suitable for use on the body part where the number of operations tends to increase. The results are shown in Table 1.

Comparative Example 1
The same procedure as in Example 1 was performed except that the hollow cross-section fiber made of polyethylene terephthalate used for the sheath yarn of Example 1 was used for the core yarn.

  In Comparative Example 1, the morphological characteristics of Example 1 were almost the same, but the 10% modulus was high and the resistance during elongation was large. Further, in the measurement of the fiber elongation ratio, a load higher than the breaking strength was applied, and the fiber broke. For this reason, Comparative Example 1 has good bulkiness, but has low follow-up to body movements, and does not achieve the stretch properties intended by the present invention. The results are shown in Table 2.

Comparative Example 2
Polyethylene terephthalate (PET: IV = 0.6 dl / g) used for the sheath yarn of Example 1 was melted at 290 ° C., weighed, and flowed into the spinning pack. Discharge with a hole diameter of φ0.30 mm used in Example 1 The holes were discharged from a spinneret arranged concentrically. The discharged yarn was blown with 20 ° C. cooling air at a flow rate of 20 m / min to cool and solidify, and after applying the spinning oil, the undrawn yarn was wound at a spinning speed of 1500 m / min. The same procedure as in Example 1 was carried out except that the undrawn yarn wound up was drawn between heating rollers at a drawing speed of 800 m / min, and a fiber having a single yarn fineness of 7.0 dtex was used as the core yarn.

  Comparative Example 2 also generally coincided with the morphological characteristics of Example 1, but had a high 10% modulus and a large resistance during elongation. Further, in the measurement of the fiber elongation ratio, a load higher than the breaking strength was applied, and the fracture occurred in the same manner as in Comparative Example 1. For this reason, Comparative Example 2 also has good bulkiness, but has low follow-up to body movements, and does not achieve the stretch properties intended by the present invention. The results are shown in Table 2.

Comparative Example 3
The polymer of the core yarn is changed to polybutylene terephthalate, melted at 270 ° C., weighed, and flowed into the spinning pack. From the spinneret in which the discharge holes having the hole diameter of φ0.30 mm used in Example 1 are arranged concentrically. Discharged. The discharged yarn was blown with 20 ° C. cooling air at a flow rate of 20 m / min to cool and solidify, and after applying the spinning oil, the undrawn yarn was wound at a spinning speed of 1500 m / min. All the examples except that the core yarn was a fiber having a single yarn fineness of 7.0 dtex obtained by drawing the wound undrawn yarn at a drawing speed of 800 m / min between heating rollers heated to 60 ° C. and 120 ° C. 1 was carried out.

  Although the comparative example 3 was able to give the load below a breaking strength by evaluation of the elongation ratio at the time of load application, since it was extended to the plastic deformation region in the SS curve, the fiber length recovery rate was 0%. The intended stretchability was not achieved. The results are shown in Table 2.

Comparative Example 4
All were carried out in the same manner as in Comparative Example 3 except that the core yarn polymer was changed to nylon 6.
Comparative Example 4 was high in breaking strength and 10% modulus, but since it was extended to the plastic deformation region in the elongation ratio evaluation at the time of application of the load as in Comparative Example 3, the fiber length restoration rate was 0%. The intended stretchability of the present invention was not achieved. The results are shown in Table 2.

Examples 5, 6, and 7
All were carried out in accordance with Example 1, except that the distance from the nozzle and the air velocity were changed and the turning point was adjusted as shown in Table 3.

In Examples 5 and 6 in which the turning point was increased and the frequency of the loop was reduced, the loop sizes were 27 mm (Example 5) and 23 mm (Example 6), which were slightly larger than those in Example 1. However, the stretch properties, which are the characteristics of the present invention, were equivalent and the texture was good.
In Example 7, in which the turning point was reduced and the frequency of the loop was increased, the size of the loop was 20 mm, which was smaller than that in Example 1, but the stretch property that is a feature of the present invention was equivalent. Further, regarding the texture, although there were many crossing points, the structure was also excellent in unwinding because it had a structure in which cutting and sagging of the sheath yarn were suppressed. The results are shown in Table 3.

Examples 8 and 9
When manufacturing hollow fibers made of polyethylene terephthalate as the sheath yarn, all operations were carried out except that the air velocity of the cooling air when the cooling air of 20 ° C. was blown from one side to the discharged yarn was adjusted as shown in Table 3. Performed according to Example 1.

Example 8 in which the velocity of the cooling air was set to 100 m / min and the radius of curvature of the sheath yarn was reduced was 2.4 mm, and the radius of curvature of the sheath yarn was about half that of Example 1. Was. The bulky yarn of Example 8 had the same stretchability as that of Example 1, which is a feature of the present invention. Further, the texture was good, and particularly the rebound feeling at the time of compression release was excellent.
In Example 9, in which the cooling wind speed was 10 m / min and the radius of curvature of the sheath yarn was increased, the radius of curvature of the sheath yarn was 29.7 mm, which was larger than that in Example 1. The bulky yarn of Example 9 had the same stretchability as that of Example 1, which is a feature of the present invention. Moreover, regarding the texture, it was excellent in flexibility at the time of compression and hardly felt a foreign object feeling. Regarding the unwinding property, a portion where the single yarn of the sheath yarn was caught was seen, but the unwinding was possible. The results are shown in Table 3.

Comparative Example 5
The same procedure as in Example 1 was performed except that the nozzle installation position was changed and the turning point was adjusted as shown in Table 4.

  In Comparative Example 5, the frequency of the loop was less than 0.1 (0.08 pieces / mm), and the number of loops self-supporting from the core yarn was very small. It was poor in bulkiness. The results are shown in Table 4.

Comparative Example 6
This was carried out in accordance with Example 1 except that a nozzle whose pressure air injection angle was changed to 90 ° was used and a turning point by a ceramic guide was not provided. However, in Comparative Example 6, at the same compressed air flow rate as in Comparative Example 5, the entanglement between the core yarn and the sheath yarn is excessive and nozzle clogging occurs, so the air flow velocity is reduced to 200 m / s, which is half of Comparative Example 5. The bulky yarn was collected and the characteristics were evaluated.

  In Comparative Example 6, the loop size of the sheath yarn was smaller than that of Example 1 before the heat treatment, and was formed in a very short period. Therefore, the sheath yarn was crimped by heat treatment. In this case, a loop was formed in the yarn, but the bulkiness was poor. When the details of the loop composed of the sheath yarn were confirmed, spots were observed in the loop size, and relatively many break points that could not be confirmed before the heat treatment were observed (with break: break point 0.5). The results are shown in Table 4.

Comparative Example 7
The thermoplastic polyurethane fiber, which is the core yarn of Example 1, was stretched false twisted to produce a crimped thermoplastic polyurethane fiber, which was carried out in the same manner as Example 1 except that this was used for the core yarn. .

  In Comparative Example 7, the frequency of the sheath yarn loop is as high as 34.5 pieces / mm, and the sheath yarn is fixed at the crimped portion of the core yarn, so that the elongation ratio at the time of applying load is higher than that in Example 1. It was a drop. Further, the fiber length recovery rate was 78%, which was inferior to the recoverability of the bulky structure. The results are shown in Table 4.

DESCRIPTION OF SYMBOLS 1 Sheath thread 2 Core thread 3 Processed thread centerline 4 Yarn path guide 5 Distance from processed thread centerline to loop apex 6 Three-dimensional crimp 7 Suction nozzle 8 Turning point 9 Bulky thread 10 Take-up roller 11 Heater 12 Delivery roller 13 Winder 14 Supply Roller 15 Core Yarn 16 Sheath Yarn 17 Pressure Air Injection Angle 18 Slit Discharge Hole

Claims (6)

  Bulkiness consisting of a sheath yarn having a three-dimensional crimped structure that is not substantially broken and continuously forming a loop, and a core yarn that fixes the sheath yarn by crossing the sheath yarn The yarn has a 10% modulus of less than 1.5 cN / dtex, a fiber elongation ratio at the time of applying a load of 1.1 or more, and a fiber length recovery rate after the application of the load of 80 to 100%. Bulky yarn.   The single yarn fineness ratio (sheath / core) of the sheath yarn and the core yarn is 0.1 to 2.0, and the intersection of the sheath yarn and the core yarn is 0.1 to 15.0 pieces / mm in the fiber axis direction of the bulky yarn. The bulky yarn according to claim 1, wherein the bulky yarn is present and the crimped structure of the sheath yarn has a radius of curvature of 2.0 to 30.0 mm.   The bulky yarn according to claim 1 or 2, wherein the single yarn fineness of the fibers constituting the bulky yarn is 3.0 dtex or more.   The bulky yarn according to any one of claims 1 to 3, wherein a fiber elongation ratio at the time of applying a load is 1.5 or more, and a fiber length recovery rate after the application of the load is 90 to 100%.   The bulky yarn according to any one of claims 1 to 4, wherein the sheath yarn is a hollow cross-section fiber having a hollow ratio of 10% or more.   A textile product comprising at least a part of the bulky yarn according to any one of claims 1 to 5.