JP2019081985A - Bulky yarn - Google Patents

Abstract

To provide a bulky yarn made of a synthetic fiber that has excellent bulkiness and compression recovery properties, as well as soft (flexible) and pliable texture like feathers, is light-weight and easy to conform with a body, has excellent heat retaining properties, and thus is suitable for use as a wadding material.SOLUTION: A bulky yarn comprises sheath yarns 1 that form loops, and core yarns 2 that interlace with the sheath yarns to substantially fix the sheath yarns 1. The sheath yarns 1 form continuous loops without being partially cut. Modified cross-section fibers each having a modification degree of 1.5 or higher are contained in the sheath yarns 1 in a content of 20% or higher. The modified cross-section fibers are preferably flat cross-section fibers. Preferably, a single fiber fineness of each fiber comprising the bulky yarn is 3.0 dtex or greater, and hollow cross-sectional fibers each having a hollowness of 10% or greater are mixed in the sheath yarns.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bulky yarn having properties similar to a soft and flexible feather, which has excellent bulkiness while being deformed with low load and soft, and when applied to a batt material for stuffed objects. It exhibits excellent heat retention and texture.

It is no exaggeration to say that the new technology of synthetic fibers has been made technologically with the imitation of natural materials as one of the motivations, and various technical measures to express functions derived from the complex structural form of natural materials. Suggestions have been made.

  Natural feathers have been used in a wide range of products such as bedding and bedding such as duvets and pillows and clothing such as cold protection equipment because of their excellent balance properties, and have established a solid position as high-performance cotton. On the other hand, there are many technical proposals for synthetic fiber in which the functionality and stable supply unique to synthetic fibers are appealing points, but it is necessary to balance the mechanical properties such as bulkiness and compression recovery and the unique texture of feathers Is a difficult thing, and few examples have achieved a degree of imitation like natural feathers.

Therefore, in order to impart the characteristics of feathers, which are excellent batting materials, to synthetic fibers, efforts are made to overcome the above-mentioned problems.
Patent Document 1 discloses a polyester composite yarn in which a fiber serving as a core projects on the other side of a loop by fluid-processing fibers having different contraction rates and performing heat treatment.

  Patent Document 2 discloses a span-like processed yarn having a structure in which a sheath yarn and a core yarn are over-fed by fluid injection processing while being entangled, and the sheath yarn is entangled with the core yarn. A hollow deformed cross-section yarn is used as a fiber constituting the processed yarn, and when it is used as a fabric, a material having bulkiness and being light in weight and exhibiting softness can be obtained.

  In Patent Document 3, two types of yarns with different supply speeds are blown directly with high-pressure air in the nozzle to open and disturb the two types of yarns for each single yarn to perform an entangling process, and supply speeds A bulky yarn is disclosed in which a loop consisting of yarns on the high side of the yarn is formed. In patent document 3, compared with the technique of patent document 1 or patent document 2, it is bulky and bulkiness which can be used as a batting material is obtained.

  Furthermore, in Patent Document 4, the applicants of the present invention have a sheath yarn having a three-dimensional crimped structure and a core yarn fixing the sheath yarn by crossing with the sheath yarn, and the sheath yarn is substantially We propose bulky yarns made of synthetic fibers that are not broken and form loops continuously. Patent Document 4 suppresses entanglement between bulky yarns and the like while having a larger loop shape than Patent Document 3, is excellent in bulkiness and compression recovery property, and has a small feeling of foreign matter when used as a batting material. , With a soft texture.

Japanese Patent Application Laid-Open No. 03-119133 JP 2002-38346 A JP 2012-67430 A Patent No. 6103157

In Patent Document 1, although it is possible to express softness in addition to bulkiness by using a modified cross-section fiber for the fiber to be a loop, the processed yarn form is similar to the conventional interlacing yarn, The bulkiness was insufficient for use as a material.

  In Patent Document 2, when the sheath yarn and / or the core yarn has a cross-sectional shape of an eyeglass type having two hollow portions independent in the longitudinal direction of the filament, when it is made a fabric, it is lightweight and excellent in heat retention and Although a soft texture is developed, as in Patent Document 1, the processed yarn form is similar to the conventional entangled yarn, and its bulkiness is insufficient for use as a battling material.

  In the bulky yarn in Patent Document 3, the size of the loop that can be formed depends on the nozzle shape, so the size of the loop that can be self-supported is limited, and the bulkiness is limited. In addition, the root of the self-supporting loop is fixed by mixed fiber entanglement, which is likely to cause foreign body feeling and hard touch when the fixed point is made into batting, and it is insufficient in terms of balance between bulkiness and soft and flexible texture. It was a thing.

  As described above, the bulky yarn in Patent Document 4 has large loop shape, but entanglement etc. between bulky yarns is suppressed, and bulkiness and recoverability after compression (compression recoverability) is excellent, and the batting material is When used as a material, it has a feeling of foreign matter less and has a soft texture. However, in order to further develop soft (soft) and flexible texture, it has been required to provide a compression rate characteristic that can be flexibly deformed by low load.

  That is, in addition to bulkiness and compression recovery, it is excellent in compression rate characteristics at low load, and when applied to a stuffed object, it has a small sense of resistance, greatly compresses and deforms while encasing the contact, and slows when releasing load. A battling material that exhibits soft (soft) and flexible texture like feathers that recover and deform has been desired.

The above object is achieved by the following means.

    (1) A sheath yarn that forms a loop and a core yarn that substantially fixes the sheath yarn by crossing the sheath yarn, and the sheath yarn forms a continuous loop without being partially cut. A bulky yarn characterized in that the sheath yarn contains at least 20% of a cross section fiber having a degree of deformation of 1.5 or more.

    (2) The bulky yarn according to (1), wherein the modified cross-section fiber is a flat cross-section fiber.

    (3) The bulky yarn according to any one of (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 (1) to (3), wherein hollow section fibers having a hollow rate of 10% or more are mixed in a sheath yarn.

  (5) A textile product comprising at least a part of the bulky yarn according to any one of (1) to (4).

The bulky yarn of the present invention contains 20% or more of a modified cross-section fiber having a degree of deformation of 1.5 or more in a sheath yarn forming a loop responsible for bulkiness, so that the initial bulkiness due to repulsion in the long axis direction of the modified cross section A large amount of compressive deformation (compression rate) by deforming while aligning the bending direction in the minor axis direction of the deformed cross section while expressing excellent shape restoration (compression recoverability) at the time of load release after maintenance and compression A loop structure that is easily compressed and deformed even at low loads and that recovers slowly and slowly becomes a bulky yarn formed radially about a core yarn.

  For this reason, while having the bulkiness and the compression recovery which are the conventional problems, it is possible to achieve both soft (soft) and flexible touch characteristics like feathers, and the filling using the bulky yarn of the present invention as the batting In addition to being excellent in basic characteristics such as light weight and heat retention, the body is deformed to wrap the flexible and flexible texture and the contact object, so it can be processed into textile products such as lightweight lightweight futons and winter outerwear. It is suitable. For example, when the stuffed object by the bulky yarn of the present invention is used as a futon, the air gap between the body and the futon is eliminated and the inflow of the outside air is prevented, so that the heat retention can be further enhanced. A stuffing object can be provided.

Schematic side view of an example of bulky yarn of the present invention Simulated diagram for explaining the method of measuring the center line of machined yarn A simulation chart for explaining how to calculate the degree of deformation of a fiber with a deformed cross section Schematic process chart schematically showing an example of the method for producing bulky yarn of the present invention The schematic side view for demonstrating the suction nozzle used for the manufacturing method of this invention The schematic sectional drawing for demonstrating the discharge hole of the spinneret for hollow section fiber used for the bulky thread | yarn of this invention

Hereinafter, the present invention will be described in detail along with the preferred embodiments.

  The bulky yarn of the present invention is obtained by processing a multifilament, and the bulky yarn and the material on the way to bulky yarn production may be expressed as "processed yarn".

  The bulky yarn of the present invention is preferably made of synthetic fibers.

  The synthetic fiber referred to here is a fiber made of a polymer, and a fiber made of a thermoplastic polymer produced by melt spinning, solution spinning or the like can be adopted. The fibers may be single fibers or composite fibers in which two or more components of a polymer are disposed in the fiber cross section.

  Examples of thermoplastic polymers constituting these fibers include polyethylene terephthalate or a copolymer thereof, polyethylene naphthalate, polybutylene terephthalate, polytrimethylene terephthalate, polypropylene, polyolefin, polycarbonate, polyacrylate, polyamide, polylactic acid, and the like. Included are melt-formable polymers such as thermoplastic polyurethanes. Among these thermoplastic polymers, polycondensation polymers represented by polyesters and polyamides are crystalline and have a relatively high melting point, so they have a heat treatment step in post-processing etc. and actual use (cleaning Even when heated at a relatively high temperature, etc.), bulky yarn can be mentioned as a preferred example without causing deterioration or sagging. From the viewpoint of this heat resistance, it is particularly preferable that the melting point of the polymer is 165 ° C. or higher.

  In these thermoplastic polymers, inorganic substances such as titanium oxide, silica and barium oxide, carbon black, colorants such as dyes and pigments, flame retardants, optical brighteners, antioxidants, as long as the effects of the present invention are not impaired. Or, various additives such as a UV absorber may be included.

  The bulky yarn of the present invention is composed of a sheath yarn (1 in FIG. 1) forming a loop and a core yarn (2 in FIG. 1) securing the sheath yarn by crossing the sheath yarn. .

  The structure of the bulky yarn of the present invention will be described using the example of the processed yarn shown in FIGS. 1 and 2.

  The core yarn of the present invention is present at the center of the processed yarn because it becomes an axis for fixing a loop consisting of the sheath yarn by crossing the sheath yarn. That is, when the straight line connecting the yarn path guides 4 in the case of threading the machined yarn with a fixed length between the pair of yarn path guides 4 shown in FIG. A distance 5 from the line 3 is in the range up to 0.6 mm.

  The sheath yarn of the present invention is formed by forming a loop radially from the center of the machined yarn toward the outer layer, and by interlinking with the core yarn, the loop is self-supporting and has a bulky structure responsible for the bulkiness of the machined yarn. Make up the department. It goes without saying that the bulkiness of the processed yarn is increased as the loops made of the sheath yarn stand on their own and project to the outer layer, but in the present invention, the loops formed of the sheath yarn from the processed yarn center line 3 shown in FIG. The distance 5 to the apex, that is, the size of the loop is preferably 1.0 mm or more.

  The size of the loop referred to here is measured from the observed image by observing from a side a bulky yarn having a fixed length of yarn hooked on the pair of yarn path guides 4. Photographed so that ten or more loops formed in bulky yarn can be observed for one bulky yarn randomly selected, and the distance from the center line 3 of the machined yarn to the vertex of the loop with ten loops in the image Measure 5 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 millimeter units. The average value of this numerical value was calculated, and the value obtained by rounding off the second decimal place was used as the size of the loop in the bulky yarn.

  In the present invention, it is preferable that the sheath yarn forming the loop is not substantially broken, particularly not substantially broken in the middle of the loop. This means that a large amount of compressive deformation can be obtained even at a low load, which is a feature of the present invention, by preventing the loop responsible for bulkiness from breaking midway and causing unnecessary entanglement, which was used as a batt In this case, it is very flexible, yet excellent in shape restoration (compression recoverability), and exhibits excellent characteristics even with respect to the development of slow recovery deformation behavior.

  The determination of loop breakage here refers to the intersection point of the core yarn and the sheath yarn to the next intersection point at ten points randomly selected from one processed yarn consisting of the sheath yarn and the core yarn (ie one Loop) is determined by photographing and observation at a magnification that allows confirmation of 10 or more points in the longitudinal direction of the processed yarn. In ten of the photographed images, the number of break points of the sheath yarn per millimeter of bulky yarn is counted for each of ten loops. The break points of the counted loop were averaged and rounded off to the second decimal place to obtain the break point of the loop (pieces / mm). Here, the fact that the breaking point is 0.2 pieces / mm or less on the average of a total of 100 loops means that the sheath yarn as referred to in the present invention is not substantially broken. Within such a range, the effect of the present invention can be exhibited well because the sheath yarn whose yarn end is free is not present in the processed yarn. In addition, it is difficult for the fibers to blow out from the side land when used as a batting, and prevents unpleasant feeling during use such as being caught by the fibers protruding from the side land, and is also effective for bulk retention of the product. Works.

  In order to achieve the object of the present invention, it is necessary for the sheath yarn constituting the bulky yarn to contain 20% or more of the modified cross-section fiber having a degree of deformation of 1.5 or more.

  The degree of heterogeneity referred to here means that the cross section of a single fiber is photographed two-dimensionally, and from the image, the diameter of a perfect circle circumscribing the single fiber cross section is taken as the circumscribed circle diameter, and the diameter of the inscribed perfect circle is an inscribed circle As the diameter, from the degree of deformation = circumscribed circle diameter 径 inscribed circle diameter, up to two decimal places are calculated. The circumscribed circle referred to here is 6 in FIG. 3 and the inscribed circle is 8 in FIG. 3, and the degree of deformation is measured for 10 fibers randomly extracted, and the measured values in each image are simply measured. The number average value was calculated, and the value obtained by rounding off the second decimal place was taken as the degree of irregularity referred to in the present invention.

  In the bulky yarn of the present invention, the void in the bulky yarn is increased by forming at least a part of the sheath yarn by the variant cross-section fiber having a degree of irregularity of 1.5 or more in cross-sectional shape, and the bulkiness per weight is excellent. It goes without saying that there is a feature in the deformation behavior particularly when a load is applied. That is, at low loads where sheath yarns with irregular cross-sections can be made to stand radially at random, they are fixed to the core yarns to maintain the loop shape by being fixed to the core yarns, while maintaining the excluded volume of bulky yarns. Depending on the cross-sectional shape of the sheath yarn, the direction of deformation is aligned with the entire sheath yarn, and flexible bending is performed in the short axis direction of the cross-section. For this reason, it becomes possible to compress greatly while wrapping the contact with a small sense of resistance, and it is possible to obtain a soft and flexible touch which can not be obtained by the conventional synthetic fiber-filled cotton. On the other hand, when released from the load, in the conventional bulky yarn, the original bulky form is restored in a relatively short time mainly using the resilience due to the rigidity of the single yarn loop, but the bulky yarn of the present invention In this case, because it utilizes the resilience in the major axis direction of the irregular cross-section fiber and the property to return to the original random self-standing state while making the recovery direction non-uniform as opposed to bending, It exhibits a slow recovery deformation behavior, which is not found in conventional bulky yarns, to be restored, and ultimately, it will exhibit the original excellent bulkiness.

  The characteristic deformation behavior at the time of compression and recovery as described above is a phenomenon unique to the bulky yarn of the present invention in which a loop shape is formed by winding and winding a sheath yarn having an irregular shape in the core yarn. The present invention is based on a phenomenon discovered as a result of intensive studies by the present inventors in order to express the flexible deformation behavior possessed by natural feathers in synthetic fiber cotton.

  As described above, in order to clarify the characteristics of the bulky yarn of the present invention that the small amount of resistance and large compression while enveloping the contact material, in the present invention, the load load usually employed in the evaluation of the compression ratio of bulky yarn By applying a load (3.0 g / cm 2) lower than 6.0 g / cm 2, evaluation of the compressibility characteristics at low loads was carried out.

  In order to make such characteristic phenomena appear more noticeably, from the viewpoint of the excluded volume at low load and the deformability at high load, it is preferable to increase the degree of deformation of the sheath yarn. For this reason, it is preferable that the heteromorphic degree is 2.0 or more, and the heteromorphic degree is 3.0 or more can be mentioned as a more preferable range, and in such a range, the contact found in natural feathers is made flexible. It is possible to highlight the features of the present invention that deform while enveloping. From the viewpoint of flexible compressive deformation, it is preferable to further increase the degree of deformation, but in consideration of spinning stability and fluid processability of the sheath yarn described later, the substantial upper limit of the degree of deformation of the present invention is 10.0. is there.

  The cross-sectional fiber used in the present invention may have any cross-sectional shape such as flat, triangular, Y, multilobal, etc. as long as the degree of deformation is 1.5 or more. Since a clear anisotropy appears in the cross section of the yarn, it is preferable from the viewpoint of further enhancing the effects of the present invention that the deformation direction of the sheath yarn is easily aligned and softly deformed when a load is applied. . In addition, when a flat cross-section fiber is adopted, there is also an advantage that the deformation degree of the cross section can be easily obtained, and furthermore, the deformation behavior can be easily controlled by the deformation degree.

  In the present invention, it is necessary that 20% or more of the deformed cross-sectional fibers with respect to the cross-sectional shape of 1.5 or more be contained with respect to the total number of sheath yarns. By controlling this ratio, it is possible to adjust the balance of the basic characteristics of bulky yarn, and in view of significantly expressing soft (soft) and flexible texture, more preferably 30% or more, more preferably 50%. It is preferable to set it as the above.

  The ratio of the modified cross-section fiber contained in the sheath yarn referred to here is 10 sheath yarns forming a loop when observed from the side, with a range of 1 cm in the longitudinal direction of the bulk yarn as one position. , The extracted single fiber cross section is observed, and the number of modified cross section fibers is counted. This operation is carried out at 10 places randomly selected in the longitudinal direction of the bulky yarn, and the number of deformed cross-section fibers contained in 100 extracted total number of single yarns is determined to calculate the ratio.

  In the bulky yarn of the present invention, when the core yarn and the sheath yarn are mixed with fibers other than modified cross section fibers, hollow cross section fibers are preferable and hollow cross section fibers having a hollow ratio of 10% or more are preferable. It is needless to say that hollow cross-section fibers are preferable from the viewpoint of lightness, but hollow cross-section fibers excellent in rigidity are preferable from the viewpoint of shape retention of bulky yarns by core yarns and protrusion of loops formed by sheath yarns. .

  The hollow percentage referred to herein is the volume percentage of the portion where no material is present in the fiber, and can be measured by the following method. That is, after cutting so that the cross section of the sheath yarn or core yarn can be observed, the fiber cross section is photographed at a magnification that allows observation of a cross section of ten or more hollow cross section fibers with a scanning electron microscope (SEM). Ten hollow cross-section fibers randomly selected from the photographed image are extracted, and the circle-equivalent diameters of the fiber and the hollow part are measured using image processing software, and the area ratio of the hollow part is calculated and determined therefrom.

  Here, when the number of hollow cross-sectional fibers that can be observed in one image is less than 10, the total number of hollow cross-sectional fibers to be observed is extracted, and the area ratio of the hollow portion is calculated and determined. The above operation is performed on 10 images taken, and the average value of 10 images is taken as the hollow ratio of the hollow cross-section fiber of the present invention.

When the hollow cross-section fiber is a round cross-section, there are the following methods as a simple evaluation method of the hollow ratio.
The side surface of the hollow cross-section fiber is observed by a magnifying means such as a microscope, and the fiber diameter in terms of round cross section is measured from the image. From the fiber diameter and the density of the fiber material, it is also possible to calculate the ratio of the actually measured fineness to the fineness of the non-hollow fiber as the hollow ratio.

  In terms of lightness and heat retention, which is the object of the present invention, the bulkiness yarn of the present invention preferably contains air, and more preferably the hollow percentage is 20% or more. Within such a range, when the bulky yarn is held in a bundle, better lightness can be realized. In addition, since it means that air having a low thermal conductivity is contained more internally, the heat retention can be further enhanced. The higher the value of this hollow ratio, the higher the heat retention tends to be, but the practical upper limit of the hollow ratio of the present invention is as a range where the bulky yarn of the present invention can be handled stably without collapsing the hollow part. 50%.

  In the bulky yarn according to the present invention, it is preferable that the core yarn and the sheath yarn be constituted by fibers having appropriate rigidity, and the single yarn fineness of the synthetic fiber constituting the bulky yarn is 3.0 dtex or more. Is preferred.

  The fineness referred to here means a value obtained by calculating the mass per 10,000 m from a simple average value obtained by measuring the weight of a unit length of a fiber several times, or a value calculated from the obtained fiber diameter, the number of filaments and density. Do.

  When the bulky yarn of the present invention is used as a batting, deformation such as compression and recovery is repeatedly applied, so that the filament to be constituted should have appropriate rigidity, and the single yarn fineness is 6.0 dtex or more. It is more preferable that With regard to the single yarn fineness of the sheath yarn, in order to increase the amount of compressive deformation contributing to the features of the present invention, it is effective to enlarge the sheath yarn loop to increase the initial bulk before being compressed, and the above aspect Is more preferably 9.0 dtex or more with respect to the single yarn fineness of the raw yarn used for the sheath yarn.

  In order to make the form effect of the bulky yarn of the present invention more remarkable, it is preferable to consider the yarn length difference of the core yarn and the sheath yarn, and the yarn length difference of the sheath yarn to the core yarn is 10 to 100 times. It can be mentioned as a preferable range.

  The yarn length difference referred to herein can be evaluated using an image captured at a magnification that allows two-dimensional observation of a bulky yarn with a digital microscope or the like. Measure the length of each core yarn and sheath yarn in millimeters to the first decimal place at 10 points randomly selected from bulky yarn. In each image, the difference in yarn length is calculated by dividing the sheath yarn length by the core yarn length, and the value obtained by rounding off the second decimal place of 10 simple averages of bulky yarn is the yarn length difference I assume. The yarn length difference corresponds to the feed velocity ratio of the core yarn and the sheath yarn to the suction nozzle in the manufacturing method to be described later, and it is possible to design a bulky structure with a desired yarn length difference by adjusting this velocity. It is possible, and in a simple manner, it can be regarded as each yarn length difference.

  Here, since bulkiness is generally determined by the yarn bundle volume per unit mass, it is more advantageous for the bulky yarn to have a smaller mass. In the bulky yarn of the present invention, since the sheath yarn forming the loop occupies most of the mass as the bulky yarn, it is preferable that the bulky structure can be maintained while reducing the mass of the sheath yarn. In this respect, it is more preferable that the yarn length difference of the sheath yarn with respect to the core yarn be 10 to 70 times. Further, from the viewpoint of processability of post-processing carried out subsequently to fluid processing, etc., it is possible to suppress hooking on the process roll and the like when the loop size is uniform. For this reason, it is more preferable that the yarn length difference of the sheath yarn with respect to the core yarn be 20 to 50 times.

  In the bulky yarn of the present invention, from the viewpoint of maintaining the resistance of the sheath yarn loop and maintaining the bulkiness, the crossing points with the core yarn serving as the base point of the sheath yarn loop may be present at an appropriate cycle in the fiber axial direction. It is suitable. Therefore, in the present invention, the crossing point of the core yarn and the sheath yarn is preferably present at 1.0 / 3 to 30.0 / mm per 1 mm of the fiber axial direction of the core yarn. Within such a range, it is meant that the loops made of the sheath yarn form a self-supporting structure, and the loops are present in a cycle that ensures the form stability of the bulky structure. In furtherance of this point of view, it is more preferable that the crossing point be present at 5.0 pieces / mm to 15.0 pieces / mm. Here, a photoelectric fluff detection device can be used to continuously evaluate the identification of the core yarn and the sheath yarn and the number of loops per unit length or crossing point in the yarn longitudinal direction of the bulky yarn. . For example, using a photoelectric fluff measurement machine (TORAY FRAY COUNTER), evaluate the distances of 0.6 mm and 1.0 mm from the center line of processed yarn under the conditions of 10 m / min of yarn speed and 0.1 cN / dtex of traveling yarn tension. It is possible.

  In the bulky yarn of the present invention, the inter-fiber static friction coefficient is preferably 0.3 or less, from the viewpoint of suppressing the entanglement between the bulky yarns when the bulky yarn is subjected to doubling. 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" in "Chemical fiber staple test method" in JIS L 1015 (2010). In addition, since the said JIS aims at a staple, it prescribes that pre-work such as fiber opening is performed in measurement, but in the measurement in the present invention, processing such as fiber opening is not performed, and bulky yarn is used. It can evaluate by arranging in parallel to a cylindrical sliver.

  In order to enhance the effect of the bulky yarn of the present invention, the coefficient of static friction between fibers from the viewpoint of suppressing the occurrence of entanglement of sheath yarn loops due to repeated compression and recovery, and the occurrence of deviation of the batting by washing when used as batting. Is preferably low, more preferably 0.2 or less, and particularly preferably 0.1 or less.

  The bulky yarn of the present invention can be made into various fiber products by using various fiber structures such as a fiber winding package, tow, cut fiber, cotton, fiber ball, cord, pile, weave, non-woven fabric and the like. The textile products referred to here are general clothing, sports clothing, clothing materials, interior products such as carpets, sofas and curtains, car interior products such as car seats, cosmetics, cosmetic masks, wiping cloths, daily life applications such as health products, etc. It can be used for environmental / industrial material applications such as filters and hazardous substance removal products. In particular, the bulky yarn of the present invention has excellent bulkiness and compression recovery properties, high compression rate characteristics even at low loads, and a soft (soft) and flexible texture, and it is preferable to use it as cotton. . Since the batting is filled on the side, by making the bulky yarn of the present invention into a yarn bundle formed by combining several to several tens of yarns, or forming a sheet such as a non-woven fabric, handling property at the time of filling can be improved. We can provide excellent materials.

Hereinafter, an example of the manufacturing method of the bulky yarn of this invention is demonstrated.
The fibers used in the bulky yarn of the present invention may be synthetic fibers obtained by melt spinning a thermoplastic polymer by a known method.

  The bulky yarn of the present invention may be any yarn containing 20% or more of a cross section fiber having a degree of deformation of 1.5 or more in the sheath yarn, and any shape may be used for the cross section of the synthetic fiber used for the core yarn and the sheath yarn. It may be something. By changing the shape of the discharge holes in the spinneret, it is possible to make it generally irregular such as round cross section, triangular cross section, Y type, octahedron type, flat type, multi-leaf type, hollow type, etc. It may be a monocomponent fiber consisting of a single polymer or a composite fiber consisting of two or more kinds of polymers.

Next, an example of a method for producing a bulky yarn from fibers obtained by spinning will be described.
The manufacturing method of the bulky yarn illustrated here mainly consists of two processes. The first step is a bulk processing step in which a core yarn and a sheath yarn are interwoven with a fluid to form a loop consisting of a sheath yarn. The second step is a heat treatment step of fixing the structure of the bulky yarn by heat treating the bulked 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. 4 and the schematic side view of the suction nozzle of FIG. In the first step, synthetic fibers 17 and 18 as raw materials are drawn out by a specified amount by a supply roller 16 having a nip roller and the like, and are sucked as core yarn and sheath yarn by a suction nozzle 9 capable of compressed air ejection.

  In this suction nozzle, the flow rate of the compressed air jetted from the nozzle is such that the yarn inserted from the supply roller to the nozzle has a necessary minimum tension, and no yarn sway or the like occurs between the supply roller and the nozzle and in the nozzle It is preferable to inject a flow that stably travels. The optimum amount of this flow rate changes depending on the hole diameter of the suction nozzle used, but a thread tension can be applied, and the air flow velocity in the nozzle is 100 m / s or more as a range where a loop can be formed smoothly. That is a guide. The standard of the upper limit of the air flow velocity is 700 m / s or less, and if it is in such a range, the traveling yarn will stably move without causing the yarn sway or the like by the compressed air jetted excessively. I will travel inside.

  Further, from the viewpoint of preventing disturbance and opening of the processed yarn in the suction nozzle, it is preferable that the injection angle 19 of the compressed air be a propulsion jet flow that is injected at less than 60 ° with respect to the traveling yarn. . This is because the loop formation by the sheath yarn can be performed uniformly with high productivity. Naturally, it is not impossible to produce the bulked yarn of the present invention even by processing with a vertical jet flow that jets fluid at 90 ° to the traveling yarn, but traveling in the nozzle by jet flow ejection from the vertical direction is possible. From the viewpoint of suppressing the opening of yarns and the entanglement of single yarns, processing by a propulsive jet is preferable. The processing by this propulsion jet flow can also suppress the formation of a short arched small loop that is easy to form in the case of a vertical jet flow.

  In the fiber configuration of the bulky yarn of the present invention, when processed by the vertical jet flow, the core yarn and the sheath yarn are mixed and entangled, and it is not impossible to form a form close to the bulky yarn of the present invention It is very difficult to prevent loop breakage and bending. Therefore, in the present invention, processing using a propelling jet stream is suitable, and a bulky yarn is formed in which yarn breakage or bending of a sheath yarn loop which leads to product defects and lack of bulkiness when used as batting is suppressed. Is possible.

  In order to stably form the sheath yarn loop required for the bulky yarn of the present invention, it is preferable not to disturb or open in the suction nozzle. It is more preferable that the jet angle of compressed air is 45 ° or less with respect to the traveling yarn from the viewpoint of traveling a multifilament consisting of one digit to two digits yarn without opening it in the nozzle. . Moreover, in terms of forming a loop outside the nozzle, it is preferable that the stability of the jet flow immediately after the nozzle and the propulsive force be high, and from this point of view, the jet angle is 20 ° or less with respect to the traveling yarn Is particularly preferred.

  The above-mentioned suction nozzle conditions used for the production of the bulky yarn of the present invention can run the inside of the nozzle without opening the yarn, and even when the number of yarns to be introduced is increased, the yarn in the nozzle The entanglement of the article can be suppressed. The bulky yarn of the present invention contains 20% or more of the modified cross section fiber in the sheath yarn, and is suitable also for feeding mixed fibers having different degrees of deformation immediately before fluid processing, and further, the number of feed yarns It is also applicable to processing when increased. Therefore, it is possible to easily carry out the adjustment of the proportion of the modified cross-section fiber.

  In order to achieve the object of the present invention by increasing the bulking process of bulky yarn and continuously producing a combined yarn, it is necessary to closely control a large number of parameters. When the bulking process is multi-spun, there is a possibility that the bulkiness of the bulky yarn will be different for each weight, so it is possible to adopt a method that utilizes the air flow control outside the nozzle described later. Is preferable because it is easy to ensure the stability of the

  Next, the yarn to which the compressed air is applied is swirled outside the nozzle to form a sheath yarn loop. This is based on the concept of forming a loop that achieves the object of the present invention by swirling the supplied yarn at a certain position injected from the nozzle, and the ratio of air velocity to yarn velocity (air velocity When the yarn speed is in the range of 100 to 5,000, the formation of the bulky structure is likely to be achieved.

  The air flow velocity herein means the velocity of the air flow injected from the suction nozzle outlet together with the traveling yarn. The air flow rate can be controlled by the cross-sectional area of the nozzle outlet and the flow rate of the compressed air. Further, the yarn speed can be controlled by, for example, the circulating speed of the take-up roller 12 for taking up the yarn after leaving the suction nozzle.

  The swirling force of the sheath yarn increases or decreases depending on the velocity ratio between the air flow velocity and the yarn velocity, so in the case where the fixation of the sheath yarn loop by the crossing point with the core yarn is strengthened, this velocity ratio approaches 5000 If it is desired to slow the crossing point, it may be made close to 100, and it may be appropriately adjusted according to the application using the bulky yarn of the present invention. The speed ratio can also have a change in the cycle of crossing points by, for example, changing the flow rate of compressed air intermittently or changing the speed of the take-off roller.

The turning force is generated when the accompanying air flow has left the running yarn. Then, a pivot point 10 for changing the yarn path is disposed. Specifically, it is sufficient to change the yarn path with a bar guide or the like, and by drawing the yarn at a prescribed speed, the sheath yarn which has turned to the core yarn forms a loop starting from the intersection point with the core yarn. . From the viewpoint of obtaining loosening due to the vibration of the sheath yarn using the space for causing this turning and the diffusion of the air flow jetted from the nozzle, the turning point of the traveling yarn should be at a position distant from the nozzle discharge port It is suitable. However, the distance between the nozzle and the turning point suitable for producing the bulky yarn of the present invention varies with the flow velocity of the jetted air. The distance between the nozzle and the turning point is such that the jet flow can maintain an appropriate swirling force in order to form an intersection point of the core yarn and the sheath yarn in an appropriate cycle in balance with the diffusion of the air flow. It is preferable that the turning point 10 be present while traveling for 10 * ^{10-5 to} 1.0 * ^10-3 seconds, and the turning point 10 be 10 seconds to travel during the 2.0 * ^{10-5 to} 5.0 * ^10-4 seconds. Is more preferably present.

  By adjusting the position of the turning point, it is also possible to control the number of turns of the sheath yarn with respect to the core yarn and the cycle of the crossing point.

  The bulky yarn 11 in which the loop consisting of the sheath yarn is formed is taken up by the take-up roller 12, and heat treatment is performed after being taken up once or following bulking for the purpose of fixing the form and developing three-dimensional crimp. It is preferable to apply FIG. 4 exemplifies a processing step of performing heat treatment subsequent to bulk processing. This heat treatment is performed by, for example, the heater 13. The heat treatment temperature is a measure of the crystallization temperature ± 30 ° C. of the polymer having the lowest crystallization temperature among the polymers used for the fibers constituting the processed yarn. In the case of processing in this temperature range, the processing temperature is far from the melting point of the polymer, and there is no portion fused and hardened between the fibers constituting the processed yarn, there is no feeling of foreign matter, and a good feeling of touch is impaired. There is nothing to do. A general contact-type or non-contact-type heater can be adopted as the heater used in the heat treatment step, and from the viewpoint of bulkiness before heat treatment and suppression of deterioration of the sheath yarn, the use of a non-contact-type heater is preferable. The non-contact heaters referred to here include air heaters such as slit heaters and tube heaters, steam heaters that heat with high-temperature steam, halogen heaters, carbon heaters, and microwave heaters that use radiant heating. Do.

  Here, a heater utilizing radiant heating is preferable from the viewpoint of heating efficiency. With regard to the heating time, for example, it is necessary to consider the time for crystallization to proceed, for example, to fix the fiber structure of the fibers constituting the processed yarn, to fix the form of the processed yarn, and to complete the crimp expression of the sheath yarn. The temperature and time may be adjusted according to the required characteristics. The processed yarn having undergone the heat treatment step may be regulated in speed via the delivery roller 14 and wound by a winder 15 having a tension control function. The winding shape is not particularly limited, and so-called cheese winding or bobbin winding can be made. In addition, in consideration of processing into a final product, it is also possible to combine a plurality of yarns in advance to form a tow or a sheet as it is.

  In the bulky yarn of the present invention, it is preferable that the silicone-based oil be uniformly attached before and after the heat treatment step. As the silicone to be attached here, it is preferable to form a silicone film on the sheath yarn and the core yarn by appropriately crosslinking the silicone by heat treatment or the like. The silicone-based oil agent referred to here is exemplified by dimethylpolysiloxane, hydrogen methylpolysiloxane, aminopolysiloxane, epoxypolysiloxane and the like, and these can be used alone or in combination. Moreover, in order to form a film uniformly on the surface of bulky yarn, a dispersant, a viscosity modifier, a crosslinking accelerator, an antioxidant, a flame retardant, and an antistatic agent are added to the oil without impairing the purpose of silicone adhesion. Can be contained. The silicone-based oil can be used without a solvent or in the form of a solution or an aqueous emulsion. It is preferable to use an aqueous emulsion from the viewpoint of uniform adhesion of the oil solution. The silicone-based oil is preferably treated so as to be capable of adhering to a bulky yarn in an amount of 0.1 to 5.0% by mass ratio using an oil agent guide, oiling roller or spraying. After that, it is preferable to dry at a desired temperature and time for crosslinking reaction. The silicone-based oil agent can be attached in multiple times, and it is also preferable to separate and attach the same type of silicone or different types of silicone to laminate a strong silicone film. By forming a silicone film on the bulky yarn by the above-described treatment, the slipperiness and texture of the bulky yarn can be enhanced, and the effects of the present invention can be further enhanced.

EXAMPLES The bulky yarn of the present invention and the effects thereof will be specifically described by way of examples.
The following evaluations were performed in Examples and Comparative Examples.

A. The mass of 100 m of the fineness fiber was measured, and the fineness was calculated by multiplying by 100 times. This was repeated 10 times, and the value obtained by rounding off the decimal point place of the simple average value was taken 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 used as the single yarn fineness.

B. Degree of deformation of fiber cross section (deformation degree)
The fiber was extracted from the sheath yarn portion forming a loop of bulky yarn, cut in a direction perpendicular to the fiber axis with a razor, and the cut surface was photographed with a scanning electron microscope SU1510 manufactured by Hitachi High-Technologies Corporation. From this image, the image of the modified cross-section fiber is extracted, the diameter of the perfect circle circumscribing the cut surface of the fiber is taken as the circumscribed circle diameter, and the diameter of the inscribed true circle is taken as the inscribed circle diameter. I asked for a degree.

Degree of deformation = (diameter of circumscribed circle of fiber cross section) / (diameter of inscribed circle of fiber cross section)
This was determined for 10 randomly selected cross-section fibers, and the second digit after the decimal point of the average was rounded off to obtain the value for the first digit after the decimal point.

C. Loop size, presence or absence of breakage Apply a load of 0.01 cN / dtex so that no slack occurs in the sample yarn, and hook it on a pair of yarn path guides 4 with a fixed length as illustrated in FIG. . The side of the bulked high thread was taken using a microscope VHX-2000 manufactured by KEYENCE CO., LTD. At a magnification that allows observation of the full width of the thread bundle. The image processing software (WINROOF) was used to measure the distance 5 from the machined yarn center line 3 to the loop apex. In this work, a total of 10 images of one processing thread are taken, and the second decimal place is measured in millimeters. The average value of this numerical value was calculated, and the value obtained by rounding off the second decimal place was taken as the size (mm) of the loop in the bulky yarn.

  In the same 10 images as above, the break point of the loop per millimeter of yarn is counted for each 10 loops, and the value obtained by rounding off the decimal point of the average value is taken as the break point of the loop (pieces / mm) . In this case, when the number of breaking points is less than 0.2 / mm, the sheath yarn is not substantially broken (described as “none” in the description of each example, comparative example and each table), 0.2 / Those with a size of mm or more were evaluated as broken (described as “present” in the description of each example, comparative example and each table).

D. A drum wound with a bulky processed yarn of 500 m or more was set on a creel, and the yarn was unwound in the cross-sectional direction of the drum and shaken off in a container installed on an electronic balance to measure 10 g of bulky yarn. The measured bulky yarn is placed in a cylindrical container having an inner diameter of 15 cm, and a circular plate whose weight is adjusted to be 0.15 g / cm ² with respect to the cross-sectional area in the cylinder is placed on the bulky yarn and left for 1 minute. The height of the bulky yarn was measured, and the first digit after the decimal point was read to obtain the height L0 of the bulky yarn. From this height, the volume (= bulkiness) of bulky yarn per unit weight was calculated from the following equation, and the first digit after the decimal point was rounded off to obtain an integer value.

Bulkiness (cm ³ / g) = cross-sectional area in cylinder × L 0 / weight of bulky yarn

E. Compression rate and recovery rate after compression (recovery rate)
Similar to the bulkiness evaluation, the height L0 of the bulky yarn was measured, and this was taken as the initial height. Next, a load was added on the circular plate so as to be 3.0 g / cm ^2, and the height one minute after this load was applied was taken as the compression height L1. Further, the height after 5 minutes after removing the additional load and returning to the load of 0.15 g / cm ² was taken as the compression recovery height L2. These measured heights were all read to the first decimal place, and the compression rate of bulky yarn and the recovery rate after compression were calculated from the following equation. The compression rate and recovery rate were rounded to the first decimal place to obtain an integer value.

Compression ratio (%) = (L0−L1) / (L0) × 100
Recovery rate (%) = (L2−L1) / (L0−L1) × 100.

F. Feeling (Basic feel of bulky yarn)
From the touch when holding the sample used for feeling evaluation, it evaluated in the following four steps.

:: excellent bulkiness and flexibility, excellent touch feeling without feeling of foreign body feeling ○: good touch feeling with bulkiness and softness Δ: although it has bulkiness, slightly bad touch feeling of feeling foreign body feeling ×: bulky There is no nature and a bad touch that feels a foreign body.

G. Texture evaluation (soft (soft) and flexible texture evaluation)
A drum having a machined yarn wound for 500 m or more was set on a creel, and the yarn was unwound in the cross-sectional direction of the drum to obtain a 10-m yarn cassette by winding using a measuring device. A sample for texture evaluation is prepared by fixing one part of this yarn cassette, and compression deformation behavior that wraps the finger when the sample is compressed slowly by hand, and return at the time of recovery when the hand is released The softness (slow recovery deformation behavior) was evaluated in the following four stages.

優 (excellent): soft and soft (soft) texture with good ○ (good): soft and soft (flexible) good texture ((good): flexible and soft (soft) feel × (poor) Impossible): Soft and soft (soft) texture (poor feel).

Example 1
After melting polyethylene terephthalate (PET: IV = 0.65 dl / g, crystallization temperature = 150 ° C) at 290 ° C, measure with a gear pump and let it flow into a spinning pack, and discharge holes with a diameter of 0.30 mm are arranged concentrically The solution was discharged from the spinneret. A cooling air of 20 ° C. was blown from one side to the discharged yarn at a flow of 20 m / min to cool and solidify, and then a spinning oil was applied, and an undrawn yarn was wound up at a spinning speed of 1500 m / min. Subsequently, the undrawn yarn taken up is drawn between the rollers heated to 90 ° C. and 140 ° C. at a drawing speed of 800 m / min to form a core yarn and a sheath yarn having a single yarn fineness of 7.0 dtex.

  Similarly, polyethylene terephthalate is discharged from a die having a known slit for flat cross section fiber, and a cooling air of 20 ° C. is blown from one side at a flow of 20 m / min to the discharged yarn to cool and solidify, and then a spinning oil is applied. And the undrawn yarn was wound up at a spinning speed of 1500 m / min. Subsequently, a flat cross-section fiber having a single fiber fineness of 7.0 dtex was obtained by drawing at a drawing speed of 800 m / min between rollers in which the undrawn yarn wound up was heated to 90 ° C and 140 ° C. The degree of deformation of this flat cross-section fiber was 3.0.

The flat cross-section fiber is supplied while being mixed and mixed so as to be 50% of the sheath yarn, and the core yarn and the sheath yarn are supplied in the process illustrated in FIG. The yarn was fed to the suction nozzle at a feed roller speed of 1000 m / min. In the suction nozzle, compressed air was jetted at a flow rate of 400 m / s at 20 ° to the traveling yarn, and the core yarn and the sheath yarn were jetted from the nozzle together with the accompanying air flow so as not to cross within the nozzle. The yarn jetted from the nozzle is made to travel with the air flow for 1.0 × 10 ^-4 seconds, the yarn path is changed using a ceramic guide, and the bulky yarn forming a loop consisting of sheath yarn is pulled with a 50 m / min roller. The Continuously, the processed yarn was guided to a tube heater through a roller, heat-treated with heated air at 150 ° C. for 10 seconds, and the form of bulky yarn was set. The bulky yarn was wound on a drum at a speed of 50 m / min by means of a tension-controlled winding machine installed after a tube heater.

  In Example 1, a bulky yarn was obtained in which a loop made of a sheath yarn is projected on average 23 mm in the outer circumferential direction. In addition, the sheath yarn formed a continuous loop in which no break was observed (break: 0.0 / mm).

  Subsequently, a silicone-based oil containing polysiloxane at a concentration of 8 wt% in bulk yarn is uniformly sprayed by a spray to a final polysiloxane coverage of 1 wt% to bulk yarn, and the temperature is 140 ° C. Heat treatment for 20 minutes to collect the bulky yarn of the present invention.

The bulky yarn had a bulkiness of 418 cm ³ / g, a compression rate of 93%, and a recovery rate of 92%, had a large amount of deformation, and was excellent also in the bulkiness recovery properties as a basic characteristic. In addition, the touch when held was very soft, and had a soft touch and soft recovery behavior as compressed, and it was excellent in soft and flexible texture (texture: ◎). The results are shown in Table 1.

Examples 2 to 4
The procedure was carried out according to Example 1 except that the deformation degree was changed by changing the hole length of the flat cross section fiber slit.

  In Example 2, the degree of deformation was set to 1.5, and although the degree of deformation was reduced compared to Example 1, the compression rate was slightly decreased, but the bulkiness remained almost the same. The texture was soft and soft and good (texture: ○).

  In Example 3, the degree of deformation was 5.0, and the degree of deformation was larger than that in Example 1. Thus, a material excellent in bulkiness and compressibility was obtained. In addition, it was excellent in recoverability, and it was excellent in soft and flexible texture without feeling of discomfort such as a foreign body (texture: ◎).

  In Example 4, the degree of deformation was 8.0, and the degree of deformation was increased as in Example 3. Thus, a material excellent in bulkiness and compressibility was obtained. In addition, it was excellent in recoverability, and it was excellent in soft and flexible texture without feeling of discomfort such as a foreign body (texture: ◎). The results are shown in Table 1.

Example 5
Using a spinneret having a known slit for Y-section fiber, a Y-section fiber having a single yarn fineness of 7.0 dtex was obtained in the same manner as in Example 1. The degree of deformation of the Y-section fiber is 2.6, and mixed with the sheath yarn at a ratio of 50% to obtain a bulky yarn in the same manner as in Example 1. The obtained bulky yarn had good bulkiness and compressibility as in Example 1. Moreover, it was excellent in recoverability, and the soft and flexible texture was good (texture: ○). The results are shown in Table 1.

Example 6
A cross-section fiber having a single yarn fineness of 7.0 dtex was obtained in the same manner as in Example 1 using a known spinneret having a slit for cross-section fiber. The degree of profile of this cross-section fiber is 2.1, and it is mixed with the sheath yarn at a ratio of 50% to obtain a bulky yarn in the same manner as in Example 1. The obtained bulky yarn had good bulkiness and compressibility as in Example 1. Although the recoverability was slightly reduced as compared with Example 1, the soft and flexible texture was good (texture: ○). The results are shown in Table 1.

Example 7
As shown in FIG. 6, three slits (width 0.1 mm) are discharged from hollow fiber discharge holes arranged concentrically so as to have a hollow ratio of 30%. A hollow round cross section fiber having a fineness of 7.0 dtex was obtained. The procedure was carried out according to Example 1 except that this hollow round cross section fiber was used as a core yarn and a sheath yarn. The bulky yarn obtained was excellent in bulkiness and compressibility as compared with Example 1. In addition, although the recovery was good and the recovery speed was increased, it was excellent in soft and flexible texture as in Example 1 (texture:)). The results are shown in Table 1.

Examples 8 to 10
It carried out according to Example 1 except having changed the mixing ratio of flat section fiber as shown in Table 2.

  In Example 8, the mixing ratio of flat cross-section fibers was set to 20%, and the compression ratio was reduced as compared to Example 1 due to the decrease in the ratio of the modified cross-section fibers in the sheath yarn. On the other hand, the touch as a basic characteristic was soft, and it was found that it was able to detect a soft and supple feel, with a tendency to wrap around in compression and a gradual recovery tendency (texture: Δ). . The results are shown in Table 2.

  Example 9 is one in which the mixing ratio of flat cross-section fibers is 30%, and although the ratio of deformed cross-section fibers in the sheath yarn is reduced, the compressibility is slightly reduced compared to Example 1. , Recoverability was good, soft and flexible texture was good (texture: ○). The results are shown in Table 2.

  In Example 10, the mixing ratio of flat cross-section fibers was 70%, and a material having an excellent compression rate as compared with Example 1 was obtained. In addition, the recovery was also good, and since the amount of compression was large, it was very soft and was excellent in soft and flexible texture (texture: ◎). The results are shown in Table 2.

Examples 11 and 12
It carried out according to Example 1 except having changed single yarn fineness of core yarn, sheath yarn, and flat section fiber as shown in Table 2, respectively.

  In Example 11, the single yarn fineness was 3.0 dtex, and the size of the loop was smaller and the bulkiness was slightly reduced compared to Example 1, but the compression ratio (evaluation:)) and The recovery rate (Evaluation: ○) was excellent. Moreover, since the single yarn fineness became small, the soft touch was further developed than Example 1, and the soft and flexible texture was excellent (texture: ◎). The results are shown in Table 2.

  In Example 12, the single yarn fineness was 10.0 dtex, and compared to Example 1, the size of the loop was large and the bulkiness was high. The compression rate (evaluation:)) and the recovery rate (evaluation:)) were also excellent, and the recovery speed was particularly fast due to the large single yarn fineness. Moreover, the soft and flexible texture was good (texture: ○). The results are shown in Table 2.

Comparative Example 1
It implemented according to Example 1 except having used the structure of fiber as 2 components of the core yarn 1 and a sheath yarn.

  Comparative Example 1 was a bulky yarn composed of two components, and the sheath yarn loop itself was large and bulkiness was good, but the compression ratio was low. For this reason, the tactile sense had a soft basic property without a sense of foreign matter, but when it was compressed by hand it felt a sense of resistance, and the recovery to the original form was quicker, compared with the first embodiment. The texture was soft and lacking (with a feeling of repulsion) (texture: x). The results are shown in Table 3.

Reference Signs List 1 sheath yarn 2 core yarn 3 machined yarn center line 4 yarn path guide 5 distance from the machined yarn center line to the loop apex 6 circumscribed circle of irregular cross section fiber 7 irregular cross section fiber 8 inscribed circle of irregular cross section fiber 9 suction nozzle 10 swirl Point 11 bulky yarn 12 take-up roller 13 heater 14 delivery roller 15 winder 16 supply roller 17 core yarn 18 sheath yarn 19 compressed air injection angle 20 slit-like discharge hole

Claims (5)

  A bulky yarn composed of a sheath yarn forming a loop and a core yarn substantially fixing the sheath yarn by crossing the sheath yarn, the sheath yarn forming a continuous loop without partial cutting. A bulky yarn characterized in that the sheath yarn contains at least 20% of a non-circular shaped fiber having a non-circularity of 1.5 or more.   The bulky yarn according to claim 1, wherein the modified cross-section fiber is a flat cross-section fiber.   The single yarn fineness of the fiber which comprises bulky yarn is 3.0 dtex or more, The bulky yarn in any one of Claim 1 or Claim 2 characterized by the above-mentioned. The bulky yarn according to any one of claims 1 to 3, wherein hollow cross-section fibers having a hollow rate of 10% or more are mixed in the sheath yarn. A textile product comprising at least a part of the bulky yarn according to any one of claims 1 to 4.