JP2017197857A - Bulk structure yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bulk structure yarn which has light weight and excellent warmth-retaining properties in addition to a soft feeling, while having good handling properties during higher-order processing.SOLUTION: There is provided a bulk structure yarn comprising a sheath yarn 1 that forms loops and a core yarn 2 that substantially secures the sheath yarn 1 by interlacing the sheath yarn 1 with the sheath yarn, in which the sheath yarn 1 forms continuous loops without breaking the sheath yarn and the sheath yarn 1 is a conjugated yarn having a density of less than 1.00 g/cm. There is also provided a bulk structure yarn having three dimensional crimps, in which each of the sheath yarn 1 and the core yarn 2 is an island-in-sea type conjugated fiber that has a hollow cross section with a hollow ratio of 10% or more respectively.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bulky structure yarn in which a large number of large loops are formed on a surface layer portion made of synthetic fibers. The bulky structured yarn of the present invention is very bulky because the sheath yarn has a large loop shape on the surface layer, and the bulky structured yarn of each has an excluded volume, thereby producing a soft texture. Moreover, since this large loop has an appropriate rigidity, the yarn itself is a very light fiber, so that it is an excellent bulky structure yarn that is extremely light and heat retaining. Furthermore, since the sheath yarn has a three-dimensional crimp, the entanglement between bulky structural yarns is suppressed, and the handleability in the molding process is good. Can be applied.

  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. For this reason, fiber materials that utilize them can be used not only for clothing but also for interiors, vehicle interiors, industrial applications, etc. by adopting various structural forms through high-order processing in addition to the basic performance of yarn production due to polymer characteristics. It's being used. The development of new technologies related to synthetic fibers is not an exaggeration to say that technological innovation has been made by imitating the imitation of natural materials, but various technologies are used to express functions derived from natural complex structural forms with synthetic fibers. Proposals have been made. For example, there are various things such as expression of unique texture (kimimi, flexibility) by imitating the cross section of silk, structural coloration represented by morpho butterfly and water repellent performance seen in lotus leaf, For one thing, there are efforts to develop functions such as soft texture with natural feathers, light weight and heat retention.

  Natural feathers are a mixture of downballs (grain-like) and feathers (feathers) that are generally collected in small quantities from the waterfowl's chest. 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, catching water birds is limited from the viewpoint of nature conservation, and the total production of natural feathers is limited. Furthermore, due to the recent occurrence of abnormal weather and epidemics, the supply amount fluctuates greatly, and in addition to the price increase, unstable supply amount is becoming a problem. In addition, the use of natural feathers is a natural odor and animal allergy, which is often a problem in spite of many processes such as hair collection, selection, disinfection, and degreasing. There are also moves to eliminate the use of feathers. 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.
For example, Patent Document 1 and Patent Document 2 disclose a method of modifying a friction characteristic of a fiber by attaching a silicone-based oil agent to a normal fiber. Certainly, the use of silicone-based oils may create a feeling of slimness in the fibers and slightly improve the texture. However, the fiber structure itself does not reach natural feathers because the fiber structure itself is poor in bulkiness and compression recovery.
Further, as shown in Patent Document 3 and Patent Document 4, by making the fiber assembly state spherical or radial, the bulkiness derived from the structure is improved. However, it feels a foreign body when compressed, and is not in terms of the soft texture of natural feathers.

  In the fiber structure mainly composed of these short fibers, the bulkiness and flexibility (compression recovery) of the structure are caused by the mechanical properties and fineness (thickness) used. For this reason, the further improvement is needed in order to make compatible the characteristic that bulkiness and a softness | flexibility contradict each other like a natural feather.

  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.

  In Patent Document 5, two types of fibers are used to supply a waist gauge while imparting yarn swaying to only one of the fibers. Form a loop. After that, a technique for obtaining a bulky processed yarn by further twisting by rubbing with two disks or the like is disclosed. Certainly, in this technique, there is a possibility of obtaining a bulky structure yarn having a loop made of a sheath yarn by adjusting the degree of yarn swaying according to the conventional method. Furthermore, there is a possibility that it can be applied as a batting material by premixing the binder and fusing it after processing to fix the loop. However, when actual twist is applied to the loop yarn in which the sheath yarn partially protrudes, and the open yarn is rubbed with rubber or the like in a mechanical kneader, the protruding loop is partially broken or deteriorated. It becomes a thing. When the processed yarn is used as a batting, it is finally filled by bundling several to several tens of yarns, so that the sheath yarn is partially broken or deteriorated (fluff). Intertwining with sheath yarns of other processed yarns may deteriorate unwinding defects and process passability in molding. Furthermore, there is a case where the bulkiness decreases with time by creating a feeling of foreign matter when a sheath yarn that is remarkably entangled with a part is filled and damaging the texture, or by promoting entanglement. Patent Document 5 is characterized in that heat treatment is applied after the untwisting step, or the sheath yarns are fused with a binder in order to strengthen the fixation of the sheath yarns. For this reason, there also exists a subject that a foreign material feeling becomes remarkable because the intertwined location is fusion-fixed.

  In patent document 6, it is a technique which fixes the excessively supplied sheath yarn with a yarn length difference by injecting compressed air from a perpendicular direction with respect to a running yarn in an entanglement nozzle, and opening and entanglement. In patent document 6, similarly to patent document 5, there is a possibility that a processed yarn having a bulkiness in which a sheath thread having a loop shape exists on the surface layer may be obtained. However, as in Patent Document 6, when the running yarn in the nozzle is disturbed, opened, and entangled, the yarn is swayed in a very short period, and the running yarn is entangled. Become. For this reason, small loops that are naturally influenced by the nozzle shape are frequently formed excessively. In addition, the size of the loop fluctuated in the fiber axis direction because the sheath yarn was entangled with the core yarn at random, and the bulkiness was limited. 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.

Such entanglement between bulky processed yarns with sagging, etc. is generally recognized as a zipper phenomenon, and affects unraveling defects in high-order processing, deterioration of the texture of textile products, and durability. It is supposed to be. For this reason, there is also an approach to try to improve mainly with fluid processed yarn.
For this reason, the bulky structure yarn in which the entanglement between the processed yarns is suppressed while having extremely high bulkiness due to the large loop is desired.

Japanese Patent Publication No. 52-28426 (Claims) Japanese Patent Publication No. 52-50308 (Claims) Japanese Patent Publication No. 48-7955 (Claims) Japanese Patent Publication No. 51-39134 (Claims) JP 2011-246850 A (Claims) JP 2012-67430 A (Claims)

  The present invention is a bulky structured yarn made of synthetic fibers, the entanglement between the bulky structured yarn is suppressed while having a large loop shape on the surface layer, the handleability in high-order processing is good, In addition to soft texture, it is to provide a bulky structure yarn that is excellent in light weight and heat retention.

  The above-mentioned subject is achieved by the following means.

(1) In a bulky structure yarn composed of a core yarn that substantially fixes a sheath yarn by crossing the sheath yarn that forms a loop and the sheath yarn, a continuous loop is formed without breaking the sheath yarn. A bulky structure yarn, wherein the sheath yarn is a composite fiber having a density of less than 1.00 g / cm ³ .

      (2) The bulky structured yarn according to (1), wherein the sheath yarn has a three-dimensional crimp.

      (3) The bulky structured yarn according to (1) or (2), wherein the sheath yarn is a sea-island composite fiber having a hollow cross section with a hollow ratio of 10% or more.

      (4) The bulky structure according to any one of (1) to (3), wherein the core yarn is a sea-island composite fiber having a hollow cross section with a hollow ratio of 10% or more, and has a three-dimensional crimp. yarn.

(5) The bulky structure yarn according to either (3) or (4), wherein the island component of the sea-island composite fiber is composed of polyolefin and the sea component is polyester.
(6) A textile product comprising at least a part of the bulky structured yarn according to any one of (1) to (5).

  The bulky structure yarn of the present invention has a large loop shape on the surface layer, and is entangled between bulky structure yarns, etc., and has a soft texture while being easy to handle in higher processing. In addition, it is excellent in light weight and heat retention.

Schematic side view of an example of the bulky structure yarn of the present invention Simulated diagram for explaining the yarn surface measurement method Simulated diagram for explaining the three-dimensional crimped structure The figure which shows typically an example of the cross section of the hollow sea island composite yarn which comprises the bulky structure yarn of this invention Schematic process drawing schematically showing an example of a method for producing a bulky structured yarn of the present invention The schematic side view for demonstrating the suction nozzle used for the manufacturing method of the bulky structure 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 structured yarn of the present invention

Hereinafter, the present invention will be described in detail together with preferred embodiments.
The bulky structured yarn of the present invention is composed of a sheath yarn that forms a loop and a core yarn that substantially fixes the sheath yarn by crossing the sheath yarn. Further, the present invention is characterized in that the sheath yarn forms a continuous loop without breaking and is a composite fiber having a density of less than 1.00 g / cm ³ .

  Synthetic fibers are used for the sheath yarn and the core yarn constituting the bulky structured yarn of the present invention. The synthetic fiber here refers to a fiber made of a polymer. As this synthetic fiber, a fiber produced by melt spinning or solution spinning can be adopted. 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, it is preferable that the melting point of the polymer is 165 ° C. or higher.

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

  In particular, when selecting a polyolefin, it is preferable from the viewpoint of improving the lightness which is the object of the present invention, and it is more preferable to select a polypropylene having a low density. In addition, in order to give not only light weight but also resistance to compression and the like, the polypropylene used has a higher molecular weight from the viewpoint of giving sufficient strength to the synthetic fiber constituting the bulky structural yarn, and its molecular weight It is preferable that the melt flow rate (MFR) used as an index of the above is 20 g / 10 min or less. MFR here is the amount of resin extruded per 10 minutes measured according to the method described in JIS K 7210: 1999. Generally, the higher the molecular weight of the resin, the smaller the MFR. As long as the MFR of the polypropylene used is within this range, the bulky structural yarn is not easily set against compression and bending during use, and is sufficiently resistant to impacts during processing. There will be no problem. In addition, when polypropylene is used for the bulky structure yarn of the present invention, there is a risk of causing oxidation heat generation when used for clothing products, etc. In order to avoid such adverse effects, the polypropylene used uses an antioxidant. It is preferable to contain.

  As illustrated in FIG. 1, the bulky structure yarn of the present invention has a sheath yarn (1 in FIG. 1) that forms a loop and a core yarn that substantially fixes the sheath yarn by crossing the sheath yarn (FIG. 1). 2).

  The core yarn referred to here means a filament existing 0.6 mm or less from the yarn surface (3 in FIG. 2). The yarn surface means a straight line connecting the yarn path guide 4 when the processed yarn is threaded at a constant length between a pair of yarn path guides (4 in FIG. 2). A filament having a distance from the yarn surface (5 in FIG. 2) of 0.6 mm or less becomes the core yarn as referred to in the present invention, and becomes a base point of a large loop. The filament protruding in a loop shape with a distance of 1.0 mm or more from the surface of the yarn is a sheath yarn referred to in the present invention, and is responsible for the bulkiness of the bulky structured yarn of the present invention. The present invention is characterized by comprising a core yarn that substantially fixes a sheath yarn that forms a large loop. The term "substantially fixed" here refers to the point that the sheath yarn intersects with the core yarn. And means being independent. Starting from the intersection of the core yarn and the sheath yarn, the sheath yarn stands in the direction of the outer layer of the bulky structured yarn and forms a loop. In many cases, the filaments are mixed and mixed at the point where they intersect with the core yarn, that is, near the starting point of the loop. For this reason, the crossing point is a point where the sheath yarn forming the apex of the loop at 1.0 mm or more from the yarn surface intersects with a straight line located 0.6 mm from the yarn surface.

  The crossing point has a role of supporting the self-supporting 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 that the crossing point of the core yarn and the sheath yarn in the bulky structured yarn is 1 to 30 pieces / mm. Within such a range, even if the sheath yarn has a three-dimensional crimp, it is preferable because a loop exists at an appropriate interval. From this viewpoint, it is more preferable that the intersection points exist at 5 to 15 pieces / mm.

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

The sheath yarn having a large loop of the present invention is substantially fixed by a core yarn and has a form protruding in the outer layer direction in the cross section of the processed yarn.
The protrusion of the large loop referred to here corresponds to the distance from the yarn surface (5 in FIG. 2). The processed yarn, which is threaded at a fixed length on a pair of yarn guides, is observed two-dimensionally from the side surface. Measured from the obtained image. The ten processing threads selected at random are photographed so that the entire loop can be observed, and projections of ten loops are photographed in each image. This operation is performed for a total of 10 images, and a total of 100 places are measured in millimeters up to the second decimal place. The average value of these numerical values was calculated, and the value rounded to the second decimal place was taken as the loop size in the present invention.

  According to the study by the present inventors, it is preferable that the large loop protrudes from the surface of the yarn within a range of 1.0 mm or more and 100.0 mm or less. The intended bulkiness and entanglement suppression effect can be exhibited without problems. Moreover, when considering the workability of the bulky structure yarn described below, 3.0 mm to 70.0 mm is more preferable. Considering that repeated compression recovery deformation is applied in a harsh environment such as sports clothing, it is particularly preferable that the thickness be 5.0 mm or more and 60.0 mm or less.

  Further, in the study by the present inventors, it has been found that when the large loop made of the sheath yarn is broken on the way or partially deteriorated, the above-mentioned effect tends to be lowered. For this reason, in the present invention for the purpose of satisfying both contradictory properties such as unconventional bulkiness and suppression of entanglement, the sheath yarn may form a continuous loop without breaking in the middle of the loop. is important.

  In this determination of breakage, it is possible to confirm by observing at the magnification at which the next intersection point (the entire loop) can be confirmed from the intersection point of the core yarn and the sheath yarn at 10 points randomly selected from the processed yarns. it can. In 10 locations to be observed, 10 sheath yarns are observed, and the average 100 locations that are broken are 0.2 or less, and the sheath yarn according to the present invention is not partially broken. This means that a continuous loop is formed. Within such a range, the sheath yarn with the free end of the yarn does not substantially exist and can exist without being entangled with other sheath yarns. When adding a conventional twisting process after adding the actual twist, or when disturbing and opening in the nozzle by powerful air jet, the running yarn is struck inside the nozzle made of metal at high frequency, and it breaks or deteriorates. There is a case. Furthermore, when it is intended to form a large loop as in the present invention, it is necessary to rub between rubber discs or the like and to perform untwisting, so that the sheath yarn is broken or greatly deteriorated. For this reason, the ruptured sheath yarn is wound around or entangled with other sheath yarns, thereby promoting the fastener effect, which is considered to have resulted in restrictions on the structure form and higher-order processing of the processed yarn. In the present invention, this point is greatly improved, and the effect of weaving the sheath yarn forming the loop can be sufficiently exhibited.

The bulky structured yarn of the present invention needs to be a composite fiber having a sheath yarn density of less than 1.00 g / cm ³ . The density of the sheath yarn here is the weight per unit volume of the sheath yarn, and is measured using a density gradient tube by a method according to JIS L 1013: 2010. If it is the range which the density of a sheath thread concerns, when it uses as stuffing cotton, such as clothing and bedding, it will become a product rich in lightness, and will become the comfort at the time of use. From the viewpoint of enhancing the lightness of the bulky structural yarn, the density of the sheath yarn is preferably 0.95 g / cm ³ or less, and more preferably 0.90 g / cm ³ or less. In order to reduce the density of the sheath yarn, for example, use of a low-density polymer or a method of forming a hollow cross section as described later can be mentioned, but considering the range in which the fiber form can be retained, the sheath yarn in the present invention The lower limit of the density is substantially 0.70 g / cm ³ .

  The composite fiber referred to here is a synthetic fiber composed of two or more different polymers, and gives various characteristics that cannot be obtained with a synthetic fiber composed of a single polymer depending on the combination of different polymers used. It is possible. As a combination of the polymers used for this composite fiber, for example, it is possible to appropriately select from the above-described polymer group.

  In the bulky structure yarn of the present invention, the shape of the loop composed of the sheath yarn protrudes from the core yarn to the outer layer starting from the crossing point, and the shape is more than the arched loop formed by general entanglement The knurled loop is preferably a teardrop shape. In the case of an arched loop, the crossing point of the core yarn and the sheath yarn is not fixed and the loop moves with a degree of freedom, but when compressive deformation is added to the bulky structure yarn, The intersection will move. For this reason, since it is difficult to return to the original shape after compressive deformation, it may be disadvantageous from the viewpoint of bulky durability. On the other hand, in the case of a knurled loop, the loop is almost fixed at the crossing point with the core yarn, so that the loop of the sheath yarn is easy to return to its original shape even after compressive deformation, and it has repulsion in the first place. The shape is suitable for exhibiting bulkiness. In general, the formation of the knurled loop has a disadvantageous shape from the viewpoint of suppressing entanglement between sheath yarns, which is the object of the present invention. From the viewpoint of suppressing the entanglement between the sheath yarns accompanying such a loop shape, the sheath yarns preferably have a three-dimensional crimp. The present inventors have reached a bulky structure yarn that has not been heretofore, and as a result of diligent research toward the adoption of a knurled loop, the adoption of a three-dimensional crimped yarn for the sheath yarn of the present invention has been a conventional problem. It was found that the entanglement of the sheath yarn was suppressed and a dramatic increase in bulkiness was possible due to the synergistic effect with the loop shape.

  The three-dimensional crimped structure in the present invention means that the filament single yarn illustrated in FIG. 3 has a spiral structure. In this three-dimensional crimp evaluation, ten or more single yarns are sampled at 10 points randomly selected from the processed yarns, and the crimped form of each single yarn can be confirmed with a digital microscope or the like. It can be evaluated by observing at a magnification. In this image, if the observed single yarn has a spirally swung form, it is determined that it has a three-dimensional crimped structure, and if it is a straight form, it is crimped. It is determined that there is no structure.

In order to make the present invention more effective, the size of this three-dimensional crimp is in the micron order where latent crimped yarns collected by a general production method such as conventional side-by-side composite fibers and hollow fibers are developed. It is preferable that it is a milli order (10 ^{<-3 >} m) rather than (10 ^<-6> m). In the present invention, the bulkiness and resilience of the processed yarn in the circumferential direction and the cross-sectional direction can be freely controlled by the size of the three-dimensional crimp. It is also possible to suppress entanglement between the sheath yarns, which is one of the objects of the invention. In particular, by setting the size of the crimp to the millimeter order, it is excellent mainly from the viewpoint of the balance between the bulkiness and compressibility of the sheath yarn, and in addition, the suppression of the entanglement of the sheath yarn.

  In the bulky structure yarn of the present invention, the cross-sectional form of the composite fiber used as the sheath yarn is not particularly limited, but it is preferably a sea-island composite fiber having a hollow cross section with a hollow ratio of 10% or more. The sea-island composite fiber referred to here is a composite fiber having a cross-sectional structure in which island components made of one polymer are scattered in sea components made of the other polymer. The fact that the sheath yarn has a hollow cross section is that, as an advantage of the manufacturing method described later, in addition to the fact that the size of the three-dimensional crimp can be controlled relatively freely from a large size to a small size, it means that the large loop is independent. It is preferable from the viewpoint. That is, in the bulky structure yarn of the present invention, the large loop made of the sheath yarn is self-supporting, which is responsible for the bulkiness. The self-supporting of the sheath yarn starts from the intersection with the core yarn and can be self-supported by the rigidity of the sheath yarn. However, in view of the settling resistance, it is preferable that the weight of the sheath yarn itself is also light. For this reason, specifically, the density of the sheath yarn (weight per unit volume) is preferably lower, and fibers having a hollow cross section are preferably used. From the viewpoint of lightness of the sheath yarn, it is more preferable to have a hollow cross section with a hollow ratio of 20% or more. The hollow ratio here refers to two-dimensional imaging at a magnification at which ten or more fibers can be observed with an electron microscope (SEM) after cutting a fiber having a hollow cross section. Ten randomly selected fibers are extracted from the photographed image, and the areas of the fibers and the hollow portion are measured using image processing software to obtain the area ratio. All the above values were measured for 10 images, and the average value of the 10 images was defined as the hollow ratio of the hollow cross-section fiber of the present invention. Further, in order to easily evaluate the hollow ratio, the side surface of the fiber is observed with a microscope or the like, and the fiber diameter in terms of a round cross section is measured from the image. It is also possible to calculate the hollowness ratio by evaluating the ratio of the actually measured fineness (measured weight) to the fineness (converted weight) converted as a solid fiber from the fiber diameter.

From the viewpoint of light weight and heat retention, which is the object of the present invention, it is preferable that the bulky structure yarn has a more air layer, and the sheath yarn particularly preferably has a hollow ratio of 30% or more. If it is in such a range, it is possible to feel better lightness when holding the processed yarn in a bundle, and it means that it has an air layer with lower thermal conductivity, so it also has heat retention. It is excellent.
As an example of the sea-island composite fiber having this hollow cross section, as shown in FIG. 4, it has a hollow portion (7 in FIG. 4) in the center of the fiber cross section, and island components are scattered in the surrounding sea components (FIG. 4-8) Donut-shaped sea-island composite fibers.

  As described above, when the hollow portion at the center of the fiber cross section contains air, not only the light weight but also the heat insulating effect is obtained by the air layer contained in the hollow portion. Furthermore, due to the sea island structure around the hollow portion, the island component scattered in the sea component disperses the impact against the impact such as compression and bending on the bulky structure yarn, thereby reinforcing the sheath yarn while maintaining the flexibility. In other words, it leads to the construction of a bulky structural yarn that is hollow but difficult to set and rich in resilience.

  The combination of the island component of the sea-island composite fiber used as the sheath yarn and the polymer used for the sea component is not particularly limited and can be appropriately selected from the above-described polymer group, but has a bulky structure. From the viewpoint of promoting weight reduction of the yarn and providing physical properties that can sufficiently withstand use as a textile product, it is preferable that the island component is polyolefin and the sea component is polyester. Since polyolefin has a low density, sea-island composite fibers are rich in light weight when used as island components. By using polyester as the sea component, properties such as the strength and elongation of the sea-island composite fiber can be made suitable for textile products, and the sea component that forms the matrix of the sea-island composite fiber has crystallinity. In addition, it is highly resistant to deterioration and settling in use. In addition, it is preferable that the island / sea composite ratio is 50/50 to 10/90 from the viewpoint of providing sufficient physical properties when the sea-island composite fiber is used as a fiber product. Further, from the viewpoint of increasing the low-density polyolefin ratio of the island component and improving the lightness of the sea-island composite fiber, the island / sea composite ratio is more preferably 50/50 to 20/80, More preferably, it is 30/70.

From the viewpoint of further improving the lightness that is the object of the present invention, it is possible to promote the reduction in the density of the bulky structural yarn and to reduce the density of the bulky structural yarn to less than 1.00 g / cm ³ . In order to achieve this, it is preferable that the core yarn is a sea-island composite fiber using a fiber having a hollow cross-section with a hollow ratio of 10% or more as a core yarn from the viewpoint of lowering the density similarly to the sheath yarn.

By reducing the density of the bulky structural yarn, it leads to occupying a larger volume with the same weight. As a result, since many air layers can be formed between the bulky structured yarns, it is possible to further improve the light weight and further enhance the heat retaining property by the heat insulating effect of the air layers.
From the same viewpoint as the above-mentioned sheath yarn, the hollow ratio of the sea-island composite fiber having a hollow cross section used for the core yarn is more preferably 20% or more, and further preferably 30% or more.

  In addition, in the bulky structured yarn, the sea-island composite fiber having a hollow cross section used for the core yarn preferably has a three-dimensional crimp from the viewpoint of further improving the texture and suppressing the entanglement. This is because, when the yarn is in a free state at the crossing point of the core yarn that substantially fixes the sheath yarn, there is an interfilament void where the crossing point is derived from the three-dimensional crimp of the core yarn. It has become. When such a bulky structured yarn is almost tension free, the sheath yarn loop can slide in a limited space in the fiber axis direction, so that the movable space of the sheath yarn is expanded, and the entanglement suppression and softness of the present invention are reduced. This is because the effect of texture becomes more prominent. On the other hand, when tension is applied to the bulky structural yarn, the sheath yarn is stretched to increase the binding force at the crossing point and prevent the loop from breaking and the sheath yarn from falling off. Demonstrate. The three-dimensional crimp of the core yarn can also be confirmed by observing the core yarn collected at random according to the above-described three-dimensional crimp evaluation method for the sheath yarn.

  In the present invention, when at least one of the sheath yarn and the core yarn constituting the bulky structured yarn has a three-dimensional crimp, the radius of curvature (r) of the spiral structure formed by the three-dimensional crimp is 1.0 to 30. Preferably it is in the range of 0.0 mm. The radius of curvature of the spiral structure mentioned here is the same method as the above-described determination of the presence or absence of three-dimensional crimping, and has a spiral structure in an image observed two-dimensionally by a digital microscope or the like. This corresponds to the radius of a perfect circle that is most inscribed in two or more places in the curve formed by the fiber (6 in FIG. 3). At 10 locations randomly selected from the processed yarns, 10 or more single yarns are collected, and each single 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 single yarns. Measure the yarn to the second decimal place in millimeters. A simple average of these measured values was calculated, and the value rounded to the second decimal place was taken as the radius of curvature of the three-dimensional crimped structure of the present invention.

  The radius of curvature of the spiral structure formed by the three-dimensional crimped structure is more preferably 2.0 to 20.0 mm. It means having a contraction. For this reason, the sheath yarn comes into contact with a point while having a moderate repulsion feeling against the compression in the cross-sectional direction of the bulky processed yarn, and a very comfortable bulkiness is achieved. Furthermore, considering the balance with a large loop having high workability, which will be described later, the range in which the effects of the present invention are exhibited well is particularly preferably 3.0 to 15.0 mm. In such a range, there is no problem with long-term durability, and the effect of the present invention is effective when applied to garment applications where repeated compression recovery is applied, particularly sports garments used in harsh environments.

  Effective for this phenomenon is not two-dimensional bending that can be applied by mechanical indentation or the like, but the single yarn itself has a three-dimensional solid shape, and has a spiral or a similar structure. That is. Conventionally, in these crimped forms, it has been recognized as a structure that is relatively easily entangled and has not been incorporated into the sheath yarn. This is a general latent crimped fiber in which the employed fiber has a fine crimp of micron order. In this case, there is a case where the fine spiral structure bites each other to promote the fastener effect.

  On the other hand, the inventors of the present invention have advanced investigations focusing on the form of the raw yarn in order to achieve entanglement suppression between the processed yarns, which is one purpose of the present application. As a result, it was found that a phenomenon completely opposite to conventional recognition occurs particularly when a three-dimensional crimp of a millimeter order is formed on a bulky structured yarn having a large loop. This is because the sheath yarn has a three-dimensional crimp, and even when it is made into a yarn bundle, the bulky structural yarns are confined to each other with an excluded volume, and the entanglement is greatly suppressed. It can be considered as a synergistic effect with the structure of a large loop made of sheath yarn. That is, the sheath yarn of the bulky structure yarn of the present invention has a movable space depending on the size of the loop, and according to the definition of the present invention, a hemisphere having a radius of 1.0 mm or more around the fixed point of the loop. It has a relatively large movable space. In this case, single yarns having a three-dimensional crimp having a size that is overwhelmingly larger than the fiber diameter come into contact with each other at points and repel each other, so that they can exist independently without being entangled. In addition, in a filament having a three-dimensional crimp, in addition to the above-described movable space, the single yarn itself can further extend like a spring in the fiber axis direction. It can be easily solved by adding. Needless to say, this is a phenomenon unique to a structural form in which a sheath thread forms a large loop several to several tens of times that of the conventional bulky structure yarn of the present invention. 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. That is, the point contact between the sheath yarns described above produces an effect of repelling each other even within a single processed yarn, and maintains the state of radial opening in the cross-sectional direction of the processed yarn as well as the initial bulkiness over time. It can be done. The behavior of the radially opened sheath yarn spring of the present invention is difficult to achieve with a conventional simple straight filament. In addition, the sheath yarns are born by repulsion with each other, and the sheath yarns having three-dimensional crimps support each other, so that the settling of the sheath yarns can be significantly suppressed.

  The morphological feature that the sheath yarn of the present invention forms a large loop and has a three-dimensional crimped structure can be seen as a reduction in the coefficient of friction. As described above, this is an effect of contact with other points, and is one of the effects produced by the bulky structure 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 the entanglement between the processed yarns while having bulkiness. The inter-fiber static friction coefficient referred to here is measured by a radar type friction coefficient tester by a method according to JIS L 1015 (2010). The evaluation of the inter-fiber static friction coefficient here is performed by arranging the processed yarns in parallel with the cylinder. When the bulky structured yarn of the present invention is processed into a fiber product, the texture increases when the fiber slips and moves appropriately during compression. Therefore, it is preferable that the inter-fiber static friction coefficient is low, and it is 0.2 or less. It is preferably 0.1 or less.

  Further, from the viewpoint of appealing superior tactile sensation with the bulky structured 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 0.5 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, as a range in which bulkiness can be efficiently processed, the single yarn fineness ratio (sheath / core) can be 0.7 to 1.5, which is more preferable in that the effect of the present invention becomes more remarkable. It is. Further, in the bulky structure yarn of the present invention, various fibers can be combined, but the core yarn and the sheath are not felt at all because of the above-described efficient fluid processing and feeling of foreign matter when compressed. It is preferred that the yarn is a fiber having the same single yarn fineness and mechanical properties. Specifically, in the present invention, it is preferable to prepare two or more drums produced under the same yarn making conditions and use them for the core yarn and the sheath yarn.

  The bulky structured yarn of the present invention has excellent bulkiness, and it is preferable that the yarn constituting the yarn has an appropriate resilience. This resilience can be seen as the second moment of the fiber cross section. In view of the object effect of the present invention, it is preferable that the single yarn fineness of the synthetic fiber is 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 mentioned here is a value calculated from the obtained fiber diameter, the number of filaments and the density, or a value calculated from the simple average value obtained by measuring the weight of the unit length of the fiber a plurality of times per 10,000 m. means.

  The bulky structured 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%. Here, the strength is a value obtained by obtaining a load-elongation curve of the processed yarn under the conditions shown in JIS L1013 (1999), and dividing the load value at break by the initial fineness. It is a value obtained by dividing the elongation at break by the initial test length. Further, the breaking strength of the bulky structure 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. The value 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 structured yarn of the present invention is used for general clothing such as inner and outer 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.

  The bulky structured 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 structured yarn of the present invention is preferably used as a batting because of its bulkiness and entanglement being suppressed. In this case, it is preferable to use a method of forming several to several tens of yarn bundles or a sheet-like material such as a nonwoven fabric because the side ground is filled. 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 are possible Become.

Below, an example of the manufacturing method of the bulky structure yarn of this invention is explained in full detail.
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. However, in the present invention, the synthetic fiber used for the sheath yarn is a composite fiber, and its density needs to be less than 1.00 g / cm ^3. For example, the composite fiber may be combined with a low-density polymer or a hollow cross section. This can be achieved by adopting a structure including

  The cross-sectional shape of the synthetic fiber used for the core yarn and the sheath yarn is not particularly limited. By changing the shape of the discharge hole in the spinneret, a general round cross-section, a triangular cross-section, a Y-shape, an eight-shape It can be indefinite such as leaf type, flat type, various types and hollow type. However, from the viewpoint of expressing the three-dimensional crimp of the sheath yarn, which is a preferable requirement of the present invention, among the above, it is also preferable to use a side-by-side type composite fiber in which a hollow cross section and two types of polymers are bonded. It is. That is, it is preferable to develop a three-dimensional crimp from the structural difference in the cross-sectional direction by performing a heat treatment after the yarn making and 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 heat treatment after a large 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. Furthermore, in forming the large loop of the present invention, the core yarn and the sheath yarn are efficiently swung, and the large loop is formed very uniformly in the fiber axis direction of the processed yarn. Become. By heat-treating the processed yarn in which this large loop is formed in the outer layer with reference to the crystallization temperature of the polymer using the processed yarn, the sheath yarn expresses a three-dimensional crimp and becomes the bulky structured yarn of the present invention. . 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 expression of crimp after the heat treatment, the fiber used in the present invention more preferably has a hollow cross section. 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 Thus, a structural difference is produced, and the size of the three-dimensional crimp can be controlled relatively freely from a large size to a small size. For this reason, it is suitable for use in the present invention, and in terms of crimp control by the above-described operation, it is more preferable to have a hollow section with a hollow ratio of 20% or more, and a hollow section with a hollow ratio of 30% or more. Is particularly preferred.

  Furthermore, from the standpoint of maintaining the shape and shape of the fiber while promoting weight reduction, a cross-sectional shape having a hollow portion at the center of the fiber cross section as illustrated in FIG. 4 and forming a sea-island structure around the donut It is preferable that In this sea-island composite fiber, the hollow part contributes to weight reduction, and further, the island component of the sea-island structure part acts as a reinforcing material on the sea component to increase the retention of the fiber form, and is resistant to bending and compression Etc. will be suppressed. In addition, using a low-density polymer for the island component leads to further weight saving.

The core yarn may be a synthetic fiber made of a single polymer, but the core yarn is preferably a sea-island composite fiber having a hollow cross section as described above from the same viewpoint as the sheath yarn.
The base used for spinning such a composite fiber is not particularly limited as long as it can composite a polymer of two or more components, but the position of the hollow cross section and the position of the sea-island structure portion are precisely controlled. When it is necessary to do so, a composite base made of a measuring plate and a distribution plate described in JP2011-174215A is preferably used. By using this composite spinneret, the cross-sectional shape can be formed with high accuracy, so that a desired fiber cross-sectional shape can be stably obtained.

  In order to form a sea-island structure (island component: polymer A, sea component: polymer B) having a hollow portion at the center of the fiber cross section and in the donut shape around the hollow portion, the distribution holes in the distribution plate are as described below. It can be achieved by arranging them into That is, a circular space where no distribution hole is drilled is provided in the central portion of the distribution plate, and distribution holes for the polymer B serving as a sea component are arranged in an annular shape around the space. The distribution hole of the polymer A is drilled on the outer periphery, and the distribution hole of the polymer B serving as a sea component is surrounded by six holes with respect to one distribution hole of the polymer A. By this arrangement, the polymer A can be scattered as island components in the sea component formed by the polymer B. In addition, since the polymer is not discharged into a circular space where the central distribution hole is not drilled, a hollow portion is formed.

  The ratio of the polymer A of the island component and the polymer B of the sea component used when spinning the composite fiber can be selected in the range of 5/95 to 95/5 in terms of the A / B ratio based on the discharge amount. . This A / B ratio is preferably 5/95 to 80/20 from the viewpoint of the formability of the hollow sea island cross section. If the polymer ratio is within such a range, the island component does not fly out to the fiber surface and the hollow portion at the center of the fiber, and the sea-island structure is well formed and a composite fiber having a desired cross section is obtained.

  The spinning temperature when spinning the synthetic fiber used in the present invention is a temperature at which the polymer used exhibits fluidity. The temperature indicating 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 + 60 ° C. or lower. If it is less than this, the polymer is not thermally decomposed in the spinning head or the spinning pack, and the molecular weight reduction is suppressed, which is preferable. The discharge amount can be 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 pressure loss referred to here is preferably determined from the range of the discharge amount from the relationship between the melt viscosity of the polymer, the discharge hole diameter, and the discharge hole length with 0.1 MPa to 40 MPa as a guide.

  The molten polymer discharged in this manner is cooled and solidified, and is taken up by a roller to which an oil agent is applied and whose peripheral speed is defined, thereby forming a synthetic fiber. 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 drawing conditions, for example, in a drawing machine composed of a pair of rollers, the first roller set to a temperature not lower than the glass transition temperature and not higher than the melting point as long as it is a fiber made of a polymer generally indicating a synthetic fiber that can be melt-spun. By the peripheral speed ratio of the second roller corresponding to the crystallization temperature, the second roller is stretched without difficulty and is heat-set and wound. 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 equal to or higher than the peak temperature on the high temperature side of the obtained tan δ may be selected as the preheating temperature. Here, from the viewpoint of increasing the stretching ratio and improving the mechanical properties, it is also a suitable means to perform this stretching step in multiple stages.

The bulky structured yarn of the present invention is a suction nozzle (FIG. 5) capable of jetting compressed air by supplying a predetermined amount of the above-mentioned synthetic fiber (11 of FIG. 5) by a supply roller (10 of FIG. 5) having a nip roller or the like. The first step is to suck the core yarn and sheath yarn according to 12).
In this suction nozzle (12 in FIG. 5), the flow rate of compressed air ejected from the nozzle is such that the yarn inserted from the supply roller into the nozzle has the minimum necessary tension, and the yarn swings between the supply roller and the nozzle and within the nozzle. What is necessary is just to inject | pour the flow volume which runs stably, without causing etc. The optimum flow rate of the compressed air varies depending on the hole diameter of the suction nozzle to be used. However, the range in which the yarn tension can be applied and the formation of a large loop, which will be described later, can be made smoothly is 100 m / s. The above is a guideline. 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 in the nozzle, it is preferable that the jet angle of the compressed air (19 in FIG. 6) is a propulsion jet that is jetted at less than 60 ° with respect to the running yarn. In view of high productivity, large loop formation with sheath yarn is performed uniformly. Naturally, it is not impossible to produce the bulky structured 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 of the traveling yarn is jetted from the vertical direction. From the viewpoint of opening and suppressing the entanglement of single yarns in a narrow space in 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 large loop made of a sheath yarn necessary for the bulky structure yarn of the present invention, it is preferable that no disturbance or fiber opening is performed in the suction nozzle. From the viewpoint of traveling a multifilament composed of several to several tens of yarns without opening them in the nozzle, the jetting angle of compressed air is more preferably 45 ° or less with respect to the running yarn. Furthermore, in order to form a large 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 ° with respect to the traveling yarn. It is particularly preferred that
Next, the step of turning the yarn sucked by the suction nozzle outside the nozzle to form a large loop of sheath yarn is the second step of the present invention.

  The yarn guided to the suction nozzle may be performed by one feed or two feeds. However, in order to produce the bulky structured yarn of the present invention, it is preferable to perform the processing by two feeds. The term “two feeds” as used herein means a method of supplying two or more yarns to a nozzle by supplying a difference in supply speed (amount) in advance with a supply roller or the like. The excessively supplied yarn (sheath yarn) forms a bulky structure in which a large loop is formed in the outer layer. When using these two feeds, it is impossible to produce a processed yarn having a loop with an interlace nozzle or a taslan nozzle that imparts the effects of disturbance, opening and entanglement to the running yarn in the nozzle. Absent. However, in the yarn processed by these processing nozzles, in addition to the loops being formed in a short period, the size thereof is also reduced. For this reason, in order to produce a bulky structured yarn that satisfies the object of the present invention, it is necessary to precisely control many existing parameters, which is very difficult. Also, when the number of spindles is increased, there is a possibility that the bulkiness of the processed yarn will differ for each spindle. It is preferable to do. In this regard, the nozzle is designed based on the concept that a large loop can be formed by swirling the two yarns supplied at a position away from the nozzle without giving any disturbance or opening process in the nozzle. As a result of intensive studies from the viewpoint of controlling the airflow injected from the air, the sheath yarn turns while opening when the ratio of the airflow velocity to the yarn velocity (airflow velocity / yarn velocity) is 100 to 3000. I discovered the phenomenon.

  The airflow speed here refers to the speed of the airflow injected along with the traveling yarn from the downstream of the suction nozzle, and can be controlled by the discharge diameter of the nozzle and the flow rate of compressed air. Further, the yarn speed can be controlled by the rotation speed of a roller for taking the processed yarn after the fluid processing nozzle. Since the turning force of the traveling yarn increases and decreases depending on the speed ratio between the airflow and the yarn, the speed ratio should be close to 3000 when the crossing point of the target bulky structure yarn is to be strengthened. On the other hand, if it is desired to make the intersection point slow, it may be close to 100. The speed ratio can be changed in the degree of intersection by, for example, intermittently changing the flow rate of the compressed air or changing the speed of the take-up roller. On the other hand, when the bulky structure yarn of the present invention is used for applications where repeated compression recovery deformation such as stuffing is applied, it is preferable to set the air velocity / yarn velocity to 200 to 2000. In particular, when manufacturing a processed yarn used for clothing such as a jacket that is frequently deformed, the air velocity / yarn velocity is set to 400 to 1500 from the viewpoint of imparting appropriate restraint and flexibility. Particularly preferred.

The turning point (13 in FIG. 5), which is the base point at which this turning force is generated, is started by causing the traveling yarn to be detached from the accompanying airflow. Specifically, it is sufficient to change the yarn path with a bar guide or the like. The take-up roller (15 in FIG. 5) in the traveling direction of the running yarn pulls the running yarn at a specified speed to thereby remove the core yarn. A sheath thread swirls around to form a large 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 distance between the nozzle and the turning point suitable for producing the bulky structure yarn of the present invention varies depending on the jetting air velocity, and the jetting airflow is from 1.0 × 10 ⁻⁵ to 1.0 × 10 6. It is preferable that a turning point (13 in FIG. 5) exists 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 airflow, the distance between the nozzle and the turning point is from 2.0 × 10 ⁻⁵ to 5.0 × 10. More preferably, it is present while traveling for ^-4 seconds.

  By adjusting this turning point, it is also possible to control the period of the intersection point of the bulky structured yarn of the present invention. The crossing point has a role of supporting the self-supporting 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 intersection point of the core yarn and the sheath yarn in the bulky structured yarn is 1 to 30 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 points exist at 5 to 15 pieces / mm.

  The processed yarn (14 in FIG. 5) in which a large loop made of sheath yarn is formed is subjected to heat treatment after being wound once or subsequent to bulky processing in order to develop shape fixation and three-dimensional crimp. Is preferred. FIG. 5 illustrates a processing step in which heat treatment is performed subsequent to the large loop formation step.

  This heat treatment (16 in FIG. 5) is performed by heating the processed yarn with a heater or the like, and the processing temperature is a crystallization temperature ± 30 ° C. of the polymer used. 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, and there is no sense of foreign matter. The good tactile feeling is not impaired. As the heater used in this heat treatment process, a general contact type or non-contact type heater can be adopted, but a non-contact type heater is suitably adopted from the viewpoint of bulkiness before heat treatment and suppression of deterioration of the sheath yarn. Is done. 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 required for fixing the fiber structure of the fibers constituting the processed yarn, fixing the shape of the processed yarn, and completing the crimp expression of the sheath yarn is a guideline. It is preferable to adjust according to the characteristics required. The processed yarn for which the heat treatment process has been completed may be wound with a winder or the like having a tension control function (18 in FIG. 5) by regulating the speed via a delivery roller (17 in FIG. 5). 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 structured 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 by heat treatment or the like. The silicone-based oil referred to here includes dimethylpolysiloxane, hydrodienemethylpolysiloxane, aminopolysiloxane, epoxypolysiloxane, and the like, and these may be used alone or in combination. In addition, from the viewpoint of uniformly forming a film on the bulky structure yarn, it contains a dispersant, a viscosity modifier, a crosslinking accelerator, an antioxidant, a flame retardant and an antistatic agent as long as the purpose of silicone adhesion is not impaired. Can be made. Even if this silicone type oil agent is straight, it can also be used as an aqueous emulsion, but from the viewpoint of uniform adhesion of the oil agent, it is preferable to use it as an aqueous emulsion. It is preferable to treat the silicone-based oil agent so that it can adhere to the bulky structure yarn in an amount of 0.1 to 5.0 wt% by mass 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 can be attached in a plurality of times, and it is also preferable to laminate a strong silicone film by attaching the same type of silicone or different types of silicones separately. By forming a silicone film on the bulky structured yarn by the above-described treatment, the slipperiness and touch of the bulky structured yarn are increased, and the effects of the present invention can be further enhanced.

The bulky structured yarn of the present invention will be specifically described below with reference to examples.
About the Example and the comparative example, the following evaluation was performed.

A. The fineness was calculated by measuring the weight of the fineness fiber of 100 m and multiplying by 100 times. 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 of the fiber. The single yarn fineness was calculated by dividing the fineness described above 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 The stress-strain curve is measured using a tensile tester Tensilon UCT-100 manufactured by Orientec Co., Ltd. under the conditions of a sample length of 20 cm and a tensile speed of 100% / min. The breaking strength was calculated by reading the load at break and dividing the load by the initial fineness. Further, the elongation at break was calculated by reading the strain at break and multiplying the value divided by the sample length by 100. For each value, repeat this operation five times for each level, obtain the simple average value of the results, break strength is rounded to the first decimal place, and break elongation is rounded to the first decimal place. The integer value.

C. Density of core yarn and sheath yarn The density of the core yarn and the sheath yarn of the bulky structure yarn was measured by a method using a density gradient tube according to JIS L 1013: 2010. After the sample reached an equilibrium position in the liquid and stopped, the sedimentation depth of the sample was read from the scale of the density gradient tube up to 1 mm, and the numerical value was compared with the correction curve to obtain the density. This was performed twice for each level, a simple average value of the obtained results was obtained, and the value obtained by rounding off the third decimal place was taken as the density.

D. A fiber having a hollow cross section is cut in a direction perpendicular to the fiber axis with a razor, and the cut surface is photographed two-dimensionally at a magnification at which 10 or more fibers can be observed with an electron microscope SU-1510 manufactured by Hitachi High-Technologies Corporation. did. Ten randomly selected fibers were extracted from the photographed image, the area of the fiber and the hollow portion was measured using image processing software, and the hollow ratio was calculated as the area ratio and calculated according to the following formula.
Hollow ratio (%) = (Cross sectional area of hollow part) / (Cross sectional area of fiber (including hollow part))
Measurement was performed for each of the ten images, and the average value of the ten images was rounded off to the first decimal place to obtain an integer value.

E. Loop evaluation (size, intersection point, break point)
A load of 0.01 cN / dtex is applied so that the processed yarn does not sag, and the yarn is hooked onto a pair of yarn guides with a constant length as illustrated in FIG. The side surface of the thread that was threaded was photographed with a magnification that allows the entire loop to be observed with a microscope VHX-2000 manufactured by Keyence Corporation. The 10 points randomly selected from this image were evaluated using the image processing software (WINROOF) to evaluate the distance (5 in FIG. 2) from the yarn surface at the tip of the loop. This operation is performed for a total of 10 images, and a total of 100 places are measured in millimeters up to the second decimal place. The average value of these numerical values was calculated, and the value obtained by rounding off the second decimal place was defined as the loop size in the present invention.
The crossing points of the loops and the breaking points of the sheath yarn were counted at the same 10 points as the ones for which the loop size was evaluated, and the crossing points and breaking points per millimeter were evaluated. The same operation was performed for 10 images, and the average value at a total of 100 places was rounded off to evaluate the integer value as a crossing point. In addition, regarding the breaking point of the loop, the counted breaking points of the loop were averaged and rounded off to the second decimal place to obtain the breaking point of the loop. Here, a sample having a breaking point of less than 0.2 pieces / mm is assumed to have a continuous loop as referred to in the present invention, no breakage (evaluation: ◯), and a sample having a breaking point of 0.2 pieces / mm or more Evaluation was made as having a fracture (evaluation: x).

F. Crimp form evaluation (3D crimp, radius of curvature)
At 10 locations randomly selected from the processed yarns, 10 or more single yarns were collected, and each single yarn was observed at a magnification at which the crimped form could be confirmed with a microscope VHX-2000 manufactured by Keyence Corporation. did. In this image, when the observed single yarn has a spirally swung form, it is determined that there is a three-dimensional crimped structure (evaluation: ○). It was determined that there was no contracted structure (evaluation: x). Further, from the same image, the radius of a perfect circle that is most inscribed at two or more places on the curved fiber (6 in FIG. 3) was evaluated using image processing software (WINROOF). As described above, a total of 100 single yarns extracted 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 the three-dimensional crimped structure of the present invention. The radius of curvature was.

G. Coefficient of static friction between fibers Measured by a radar type friction coefficient tester by a method according to JIS L 1015 (2010). In addition, the static friction coefficient evaluation between fibers here is evaluated by arranging the processed yarns in parallel with the cylinder. The inter-fiber static friction coefficient was calculated by rounding off the second decimal place of the measured value.

H. 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: No yarn dance is seen, and the unwinding property is excellent.

  ○: Slight yarn dance is observed, but can be solved well.

  Δ: Dancing of the yarn and slight catching are seen but can be unraveled.

  ×: Yarn dancing and catching occur and cannot be solved.

I. 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.

  A: A texture excellent in flexibility.

  ○: Texture with good flexibility.

  Δ: Texture with flexibility.

  X: Poor texture that is inflexible and feels a foreign body.

J. et al. Bulky structures yarn bulky evaluation bulky structure yarn inner diameter 28.8cm, and 20g packed in cylindrical containers height 50.0 cm, load from the top of the 0.15 g / cm ² in a direction perpendicular to the bulky structure yarns filled measuring the height H (cm) of space bulky structure yarn occupied when multiplied by calculates the bulkiness (in 3 / ^20g) from the following equation, an integer value obtained by rounding off the first decimal place of the value Was bulky.
Bulky ^{(in 3 /20g)=(14.4 2 π / 2.54} 3) × H.

Example 1
Polypropylene (PP: MFR = 9 g / 10 min) as an island component is melted separately at 265 ° C. and polyethylene terephthalate (PET: 0.65 dl / g) as a sea component is melted separately at 300 ° C., and weighed and allowed to flow into a spinning pack. A hollow sea-island composite yarn having a spin block temperature of 280 ° C., a hollow portion at the center of the fiber cross section, and a sea-island structure in a donut shape around the melt was spun. The spinneret incorporated in the spin pack uses a composite base consisting of a measuring plate and a distribution plate described in JP 2011-174215 A, and as a distribution plate, a circular space in which no distribution hole is drilled is provided in the center of the plate, The distribution hole of the sea component polymer was arranged in an annular shape around the periphery, and further, the distribution hole of the sea component polymer was surrounded by 6 holes with respect to one distribution hole of the island component polymer on the outer periphery. . The composite polymer flow discharged at a composite ratio of island / sea = 30/70 was sprayed with cooling air at 20 ° C. from one side at a flow rate of 100 m / min, and after cooling and solidification, an oil agent was applied, and undrawn yarn at a spinning speed of 1200 m / min. After being wound, the film was stretched 2.9 times at a stretching speed of 600 m / min between rollers heated to 90 ° C. and 130 ° C., fineness 78 dtex, 12 filaments, 32 islands per filament, hollow ratio 30 %, And a drawn yarn having a density of 0.87 g / cm ³ .
In the process illustrated in FIG. 5, the obtained hollow sea-island composite yarn is supplied to each of two supply rollers, one hollow sea-island composite yarn, with one supply roller at a speed of 50 m / min and the other at a speed of 1000 m. / Min as suction / min. 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, and the yarn path is changed using a ceramic guide to form a processed yarn with a large loop of sheath yarn, and 50 m / Taken in min.
Subsequently, the processed yarn was guided to a tube heater through a roller and heat-treated with heated air at 150 ° C. for 10 seconds to set the form of a bulky structured yarn and to cause a three-dimensional crimp in the sheath yarn. The bulky structured yarn was wound around a drum at 52 m / min by a tension control type winder installed after the tube heater. Further, a silicone oil agent containing polysiloxane at a concentration of 8 wt% in the collected bulky structural yarn is sprayed uniformly so that the final polysiloxane adhesion amount is 1 wt% with respect to the bulky structural yarn, 165 The processed yarn was collected by heat treatment at a temperature of 20 ° C. for 20 minutes.
The bulky structured yarn collected in Example 1 had a structure in which large loops of sheath yarn protruded from the surface of the 21.0 mm yarn on average, and the large loops were formed at a frequency of 10 pieces / mm. . This protruding loop was excellent in uniformity in size and period.
The core yarn and sheath yarn have a three-dimensional crimped structure in the millimeter order with a radius of curvature of 4.5 mm, and the large loop of the sheath yarn forms a continuous loop with no breaks. It was. (Break location: 0.0)
In the bulky structure yarn, the sheath yarn forming a continuous large loop has a three-dimensional crimped structure, the inter-fiber static friction coefficient is 0.1, and the unwinding from the wound drum is very It was smooth and excellent in unzipping (unzipping:）). Moreover, it had a bulkiness derived from the specific structure of the present invention and had a texture excellent in flexibility (texture:）). Moreover, in bulkiness evaluation, 628in < ³ > / 20g and the outstanding bulkiness were exhibited. The results are shown in Table 1.

Examples 2 and 3
The island / sea composite ratio of the hollow sea-island composite yarn used for the sheath yarn and the density of the drawn yarn are island / sea = 20/80 and density 0.90 g / cm ³ (Example 2), island / sea = 10/90. And it implemented according to Example 1 except having changed into density 0.93 g / cm < ³ > (Example 3).
The bulky structure yarn collected in Example 2 was one in which a continuous loop in which no breakage was observed was formed in the large loop of the sheath yarn. The sheath yarn has a three-dimensional crimped structure, is excellent in unwinding from the wound drum (unwinding property: ◎), and has a texture that is excellent in flexibility. There was (texture: ◎). In the bulky evaluation, it took a bulky and excellent 606in ³ / 20g.
The bulky structure yarn collected in Example 3 was one in which a continuous loop in which no breakage was observed was formed in the large loop of the sheath yarn. The sheath yarn has a three-dimensional crimped structure, is excellent in unwinding from the wound drum (unwinding property: ◎), and has a texture that is excellent in flexibility. There was (texture: ◎). Moreover, in bulkiness evaluation, 582 in < ³ > / 20g and the favorable bulkiness were exhibited. The results are shown in Table 1.

Example 4
The hollow sea-island composite yarn used for the sheath yarn was changed according to Example 1 except that the hollow ratio was changed to 20% and the density of the drawn yarn was changed to 0.99 g / cm ³ .
The bulky structured yarn collected was a continuous loop in which no breakage was found in the large loop of the sheath yarn. The sheath yarn has a three-dimensional crimped structure, the unwinding property from the wound drum is good (unwinding property: ○), and it has a texture with excellent flexibility. There was (texture: ◎). Moreover, in bulk evaluation, 554 in < ³ > / 20g and sufficient bulk were exhibited. The results are shown in Table 1.

Example 5
Example except that the island / sea composite ratio of the hollow sea island composite yarn used for the sheath yarn was changed to 50/50, the hollow ratio was changed to 20%, and the density of the drawn yarn was changed to 0.98 g / cm ^3. 1 was carried out.
The bulky structured yarn collected was a continuous loop in which no breakage was found in the large loop of the sheath yarn. The sheath yarn has a three-dimensional crimped structure, the unwinding property from the wound drum is good (unwinding property: ○), and it has a texture with excellent flexibility. There was (texture: ◎). Moreover, in bulk evaluation, 563 in < ³ > / 20g and sufficient bulk were exhibited. The results are shown in Table 1.

Comparative Example 1
The same procedure as in Example 1 was performed except that the hollow ratio of the hollow sea-island composite yarn used for the sheath yarn was changed to 8% and the density of the drawn yarn was changed to 1.14 g / cm ³ .
The bulky structured yarn collected was a continuous loop in which no breakage was found in the large loop of the sheath yarn. The sheath yarn has a three-dimensional crimped structure, the unwinding property from the wound drum is excellent (unwinding property: ◎), and the texture is also excellent in flexibility ( Texture: ◎). On the other hand, in the bulky evaluation, 457in ³ / 20g and bulky were unsatisfactory. The results are shown in Table 1.

Comparative Example 2
Example except that the island / sea composite ratio of the hollow sea-island composite yarn used for the sheath yarn was changed to 5/95, the hollow ratio was changed to 20%, and the density of the drawn yarn was changed to 1.09 g / cm ^3. 1 was carried out.

The bulky structured yarn collected was a continuous loop in which no breakage was found in the large loop of the sheath yarn. The sheath yarn has a three-dimensional crimped structure, the unwinding property from the wound drum is excellent (unwinding property: ◎), and the texture is also excellent in flexibility ( Texture: ◎). On the other hand, in the bulky evaluation, 504in ³ / 20g and bulky were unsatisfactory. The results are shown in Table 1.

Comparative Example 3
In order to verify the effect of the bulky processing of the present invention, a nozzle having a pressure air injection angle changed to 90 ° was used, and a turning point by a ceramic guide was not provided.
The bulky structured yarn collected had a loop size of the sheath yarn smaller than that of Example 1 before the heat treatment, and was formed with a very short period. For this reason, when the sheath yarn is crimped by heat treatment, a loop is formed in the yarn, but the bulkiness is 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). Although the texture was flexible (texture: Δ), the unwinding property from the wound drum was poor (unwinding property: x) due to yarn dancing and catching. The results are shown in Table 1.

Example 6
Polyethylene terephthalate (PET: IV = 0.65 dl / g) was melted at 290 ° C., weighed and poured into a spinning pack, and three slits (width 0.1 mm, 17 in FIG. 7) as illustrated in FIG. Were 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 of the discharged yarn at a flow rate of 100 m / min to cool and solidify, and then a nonionic spinning oil was applied, and the undrawn yarn was wound at a spinning speed of 1500 m / min. Subsequently, the wound undrawn yarn was drawn 3.0 times at a drawing speed of 800 m / min between rollers heated to 90 ° C. and 140 ° C. to obtain a drawn yarn having a fineness of 78 dtex, a filament count of 12, and a hollow rate of 30%. Example 1 was carried out except that this drawn yarn was used as the core yarn.
The bulky structured yarn collected was a continuous loop in which no breakage was found in the large loop of the sheath yarn. The sheath yarn has a three-dimensional crimped structure, has excellent unwinding properties from the wound drum (unwinding property: ◎), and has a soft texture (texture) : ○). Moreover, in bulkiness evaluation, 591in < ³ > / 20g and favorable bulkiness were exhibited. The results are shown in Table 2.

Example 7
The spinneret was changed to a spinneret having 12 round holes drilled so as to obtain a general round cross-section fiber, and a polyethylene terephthalate-only drawn yarn was collected under the same conditions as in Example 6. Except that the drawn yarn was used as the core yarn, all operations were performed according to Example 1.

The bulky structured yarn collected was a continuous loop in which no breakage was found in the large loop of the sheath yarn. The sheath yarn has a three-dimensional crimped structure, has excellent unwinding properties from the wound drum (unwinding property: ◎), and has a soft texture (texture) : ○). Moreover, in bulk evaluation, 579 in < ³ > / 20g and a favorable bulk were exhibited. The results are shown in Table 2.

Comparative Example 4
The bulky structure yarn was processed according to Example 1 except that a hollow fiber having a hollow rate of 30% made of polyethylene terephthalate alone was used for the core and sheath.

The bulky structured yarn collected was a continuous loop in which no breakage was found in the large loop of the sheath yarn. The sheath yarn has a three-dimensional crimped structure, the unwinding property from the wound drum is excellent (unwinding property: ◎), and the texture is also excellent in flexibility ( Texture: ◎). On the other hand, in the bulky evaluation, bulkiness is insufficient and 540in ³ / 20g. The results are shown in Table 2.

Comparative Example 5
The bulky structure yarn was processed according to Example 1, except that a polyethylene terephthalate single yarn that was not hollow in both the core and sheath was used.
The bulky structured yarn collected was a continuous loop in which no breakage was found in the large loop of the sheath yarn. The sheath yarn has a three-dimensional crimped structure, the unwinding property from the wound drum is excellent (unwinding property: ◎), and the texture is also good (texture) : ○). On the other hand, in the bulky evaluation, bulkiness is insufficient and 533in ³ / 20g. The results are shown in Table 2.

Examples 8-10
It carried out according to Example 1 except that the air velocity in fluid processing was changed to 350 m / s (Example 8), 175 m / s (Example 9), and 88 m / s (Example 10), respectively.

The bulky structure yarn collected in Example 8 had a structure in which large loops of sheath yarn protruded from the surface of the 60.0 mm yarn on average, and formed a continuous loop in which no breakage was seen. The unwinding property from the wound drum was excellent (unwinding property:）), and the texture was excellent in flexibility (tactile sensation:）). Moreover, in bulkiness evaluation, the bulkiness which was excellent with 603in < ³ > / 20g was exhibited.

The bulky structure yarn collected in Example 9 had a structure in which large loops of sheath yarn protruded from the surface of the 70.0 mm yarn on average, and formed a continuous loop in which no breakage was observed. The unwinding property from the wound drum was good (unwinding property: ○), and the softness was also good (tactile feeling: ○). Moreover, in bulkiness evaluation, the bulkiness which was excellent with 607in < ³ > / 20g was exhibited.

The bulky structured yarn collected in Example 10 had a structure in which large loops of sheath yarn protruded from the surface of the 100.0 mm yarn on average and formed a continuous loop in which no breakage was observed. The wound drum showed a dance of yarn and slight catch, but it could be unwound (unwinding property: Δ), and had a sufficiently flexible texture (tactile sensation: Δ). Moreover, in bulkiness evaluation, the bulkiness which was excellent with 612in < ³ > / 20g was exhibited. The results are shown in Table 3.

Examples 11 and 12
This was carried out according to Example 1, except that the jet angle of the compressed air in the fluid processing was changed to 55 ° (Example 11) and 45 ° (Example 12).
The bulky structure yarn collected in Example 11 had a structure in which large loops of sheath yarn protruded from the surface of the 3.0 mm yarn on average and formed a continuous loop in which no breakage was seen. The unwinding property from the wound drum was excellent (unwinding property:）), and the texture was excellent in flexibility (tactile feeling: ◯). Moreover, in bulkiness evaluation, 573 in < ³ > / 20g and the favorable bulkiness were exhibited.
The bulky structure yarn collected in Example 12 had a structure in which large loops of sheath yarn protruded from the surface of the 5.0 mm yarn on average and formed a continuous loop in which no breakage was seen. The unwinding property from the wound drum was excellent (unwinding property:）), and the texture was excellent in flexibility (tactile sensation:）). Moreover, in bulkiness evaluation, the bulkiness which was excellent with 600in < ³ > / 20g was exhibited. The results are shown in Table 3.

Examples 13-17
The single yarn fineness of the hollow sea-island composite yarn used for the sheath yarn was changed, and the single yarn fineness ratio (sheath / yarn) was set to 2.0 (Example 13), 1.5 (Example 14), 0.7 (implemented) Example 15) The procedure of Example 1 was repeated except that the values were changed to 0.5 (Example 16) and 0.3 (Example 17).

The bulky structure yarn collected in Example 13 formed a continuous loop in which no breakage was found in the large loop of the sheath yarn, and the curvature radius of the loop was 1.3 mm. The unwinding property from the wound drum was excellent (unwinding property:）), and the texture was sufficiently flexible (tactile sensation: Δ). Moreover, in bulk evaluation, it was 550 in < ³ > / 20g and was sufficient bulky.

The bulky structure yarn collected in Example 14 formed a continuous loop in which no breakage was found in the large loop of the sheath yarn, and the curvature radius of the loop was 2.2 mm. The unwinding property from the wound drum was excellent (unwinding property:）), and the texture was excellent in flexibility (tactile feeling: ◯). Moreover, in bulkiness evaluation, 573 in < ³ > / 20g and the favorable bulkiness were exhibited.

The bulky structure yarn collected in Example 15 formed a continuous loop in which no breakage was found in the large loop of the sheath yarn, and the radius of curvature of the loop was 14.4 mm. The unwinding property from the wound drum was excellent (unwinding property:）), and the texture was excellent in flexibility (tactile feeling: ：). In addition, it exerted a bulky and excellent 614in ³ / 20g is a bulky evaluation.

The bulky structured yarn collected in Example 16 formed a continuous loop in which no breakage was found in the large loop of the sheath yarn, and the radius of curvature of the loop was 19.4 mm. The unwinding property from the wound drum was good (unwinding property: ◯), and the softness was also good (tactile feeling: ◯). Moreover, in bulk evaluation, 582in < ³ > / 20g and a favorable bulk were exhibited.
The bulky structured yarn collected in Example 17 formed a continuous loop with no breakage in the large loop of the sheath yarn, and the radius of curvature of the loop was 19.4 mm. The drum that was wound had a dance of yarn and a slight catch, but it could be unwound (unwinding property: Δ), and had a good texture (tactile feeling: ○). Moreover, in bulk evaluation, 557in < ³ > / 20g and bulkiness were enough. The results are shown in Table 4.

Examples 18-20
The jet airflow is 9.0 × 10 ⁻⁴ seconds (Example 18), 4.8 × 10 ⁻⁴ seconds (Example 19), and 1.2 × 10 ⁻⁵ seconds (Example) at the turning points of the running yarns. 20) Carried out in accordance with Example 1 except that it was adjusted to be present while traveling.
The bulky structure yarn sampled in Example 18 had a good texture with good flexibility (tactile sensation: ○). ). Moreover, in bulkiness evaluation, the bulkiness which was excellent with 616in < ³ > / 20g was shown.
The bulky structure yarn collected in Example 19 had excellent unwinding properties from the wound drum (unwinding property:）) and a texture with excellent flexibility (tactile feeling: ：). Moreover, in bulkiness evaluation, 603in < ³ > / 20g and the outstanding bulkiness were exhibited.
The bulky structured yarn collected in Example 20 could be smoothly unwound from the wound drum (unwinding property:）). Moreover, the texture was a good tactile sensation (tactile sensation: ◯). The bulky evaluation showed sufficient bulkiness and 561in ³ / 20g. The results are shown in Table 5.

Example 21
The sample was carried out in accordance with Example 1 except that the collected bulky yarn was not provided with a silicone-based oil containing polysiloxane and was not subjected to a silicone fixing heat treatment.
The bulky structured yarn collected had a coefficient of static friction between fibers of 0.3, the unwinding property from the wound drum was good (unwinding property: ○), and the texture was also good (tactile sensation) : ○). Also in the bulky evaluation took a bulky and excellent 624in ³ / 20g. The results are shown in Table 5.

  The bulky structure yarn of the present invention has a soft texture, is lightweight and excellent in heat retention, is not easily entangled with each other, and has excellent handleability at the time of molding processing, such as clothing, bedding, heat insulating material Suitable for padding, padding, etc.

DESCRIPTION OF SYMBOLS 1 Sheath thread 2 Core thread 3 Yarn surface 4 Yarn guide 5 Distance from thread surface 6 Three-dimensional crimp 7 Hollow part 8 Island component 9 Sea component 10 Supply roller 11 Synthetic fiber 12 Suction nozzle 13 Turning point 14 Processed yarn 15 Take-off roller 16 Heater 17 Delivery roller 18 Winder 19 Pressure air injection angle 20 Slit discharge hole

Claims (6)

In a bulky structure yarn comprising a sheath yarn that forms a loop and a core yarn that substantially fixes the sheath yarn by crossing the sheath yarn, a continuous loop is formed without breaking the sheath yarn, and the sheath A bulky structure yarn, wherein the yarn is a composite fiber having a density of less than 1.00 g / cm ³ . The bulky structure yarn according to claim 1, wherein the sheath yarn has a three-dimensional crimp. The bulky structured yarn according to claim 1 or 2, wherein the sheath yarn is a sea-island composite fiber having a hollow cross section with a hollow ratio of 10% or more. The bulky structure yarn according to any one of claims 1 to 3, wherein the core yarn is a sea-island composite fiber having a hollow cross section with a hollow ratio of 10% or more, and has a three-dimensional crimp. The bulky structure yarn according to claim 3 or 4, wherein the island component of the sea-island composite fiber is composed of polyolefin and the sea component is composed of polyester. A textile product comprising at least a part of the bulky structural yarn according to any one of claims 1 to 5.