JP2017197858A - 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 and stretchability in addition to a good texture.SOLUTION: In a bulk structure yarn comprising a sheath yarn 1 that forms continuous loops without breaking the sheath yarn and a core yarn 2 that substantially secures sheath yarn 1 by interlacing the sheath yarn 1 with itself, the bulk structure yarn has loops of 1 to 30 loops/mm which protrude 3 mm or more from a surface layer of the yarn and has a modulus of 80 cN/dtex or less and has an elongation recovery ratio at 10% elongation recovery of 50% or more. Any of the sheath yarn 1 and the core yarn 2 comprise hollow cross-section fibers having hollow ratio of 20% or more. Constitutional fibers of the bulk structure yarn have a single fiber fineness of 3.0 dtex or more. The single fiber fineness ratio of the sheath fiber 1 to the core yarn 2 (sheath/core) is from 0.5 to 2.5. The core fiber is a side by side type conjugate fiber or an eccentric sheath and core type conjugate fiber. A fiber constituting the sheath yarn 1 is a three dimensional crimping structure yarn having a curvature radius of 2 to 30 mm and has a coefficient of static friction between fibers is 0.3 or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bulky structure yarn with a large number of large loops formed on the surface layer, and can be applied in a wide range of applications from clothing to industrial use because it can demonstrate high heat retention while providing a soft tactile feel. It becomes.

  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 often causes problems such as peculiar odor and animal allergy despite many processes such as hair collection, selection, disinfection, and degreasing. In addition, there is a movement to eliminate the use of natural feathers in Europe and other countries from the viewpoint of animal welfare. 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, as shown in Patent Document 1 and Patent Document 2, 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 3, two types of fibers are used to supply the waist gauge while giving a yarn swing or the like 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, with this technique, there is a possibility that a bulky structure yarn having a loop made of a sheath yarn can be obtained by adjusting the degree of yarn swaying according to the conventional method. 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 deteriorated portion (fluff) is significantly different from the sheath yarn of the other processed yarn. It will be intertwined. When the entangled sheath yarns are filled, there is a case where the bulkiness is lowered with time by creating a feeling of foreign matter and impairing the texture, or by promoting the entanglement.

  In patent document 4, 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 Literature 4, there is a possibility that a processed yarn having bulkiness in which a sheath yarn having a loop shape is present on the surface layer may be obtained. However, as in Patent Document 4, when the running yarn in the nozzle is disturbed, opened, and entangled, the yarn oscillates 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.

In addition, when using the processed yarn as described in Patent Document 3 and Patent Document 4 as batting, in addition to the problems related to bulkiness and texture described above, for the purpose of suppressing entanglement and twisting, Both ends of the processed yarn are fixed for use. However, in the processed yarns described in Patent Document 3 and Patent Document 4, since the processed yarn itself is not extensible, the processed yarn fixed at a fixed length is stretched in the filling, and there is a margin in design and size. Otherwise, an unpleasant sense of restraint may be produced. In particular, when sewing to clothing, etc., it is necessary to design the elbows, knees, neck and waistline with a large range of movement, so that there is an extra space, and functions such as heat retention cannot be fully demonstrated. There was a case.
Therefore, there is a demand for a bulky structure yarn having a very high bulkiness due to a large loop and suppressing entanglement between processed yarns and having a good stretchability.

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

  It is an object of the present invention to provide a bulky structure yarn suitable for a high-function heat retaining material. The bulky structure yarn of the present invention has not only a unique bulky structure but also a comfortable stretch property. For this reason, for example, in addition to adhesiveness, it is excellent in the operation follow-up property of extending and deforming flexibly in accordance with movement, and can be used for a high-functional heat-insulating material having a good wearing feeling and excellent light weight and heat-retaining properties.

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

      (1) In a bulky structure yarn composed of a sheath yarn that forms a continuous loop without breaking and a core yarn that substantially fixes the sheath yarn by crossing with the sheath yarn, it protrudes 3 mm or more from the surface of the yarn. A bulky structural yarn characterized in that the number of loops is from 1 / mm to 30 / mm, and the elastic modulus is 80 cN / dtex or less, and the elongation recovery rate at the time of 10% elongation recovery is 50% or more.

      (2) The single yarn fineness of the constituent fibers is 3.0 dtex or more, and the single yarn fineness ratio (sheath / core) of the core yarn and the sheath yarn is in the range of 0.5 to 2.5 ( The bulky structure yarn described in 1).

      (3) The core yarn is a side-by-side type or eccentric core-sheath type composite fiber, and the fiber constituting the sheath yarn is a three-dimensional crimped structure yarn having a radius of curvature of 2 mm to 30 mm (1) or The bulky structure yarn described in (2).

      (4) The bulky structured yarn according to any one of (1) to (3), wherein the inter-fiber static friction coefficient is 0.3 or less.

(5) The bulky structure yarn according to any one of (1) to (4), wherein both the core yarn and the sheath yarn are made of hollow cross-section fibers having a hollow ratio of 20% or more.
(6) A textile product comprising at least a part of the bulky structural yarn according to any one of (1) to (5).

  The bulky structure yarn of the present invention has a unique bulky structure in which a large loop having a three-dimensional crimped shape is formed on the surface layer, so that entanglement between the bulky structure yarns is suppressed. In addition to good tactile sensation without foreign material feeling, it exhibits excellent light weight and heat retention. In addition, because it has a stretch property that stretches and deforms with low stress, for example, it has excellent motion followability to body movement, etc., and it does not create unnecessary voids, so it is compact but has excellent heat retention function It can be used as a highly functional thermal insulation material.

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 crimp structure Schematic cross section of an example of yarn cross section 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 large loop and a core yarn that substantially fixes the sheath yarn by crossing the sheath yarn. Further, the present invention is characterized in that a continuous large loop is formed without breaking the loop.

  The bulky structured yarn of the present invention is preferably composed of synthetic fibers from the viewpoint of making use of the features of the present invention in the process passability when performing bulky processing and in actual use. The synthetic fiber here refers to a fiber made of a polymer. 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.

  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. Further, the filament protruding in a loop shape with a distance from the yarn surface of 3.0 mm or more 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 3.0 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, the crossing points of the core yarn and the sheath yarn in the bulky structure yarn need to be present at 1 to 30 pieces / mm. If it is such a range, it means that a loop exists at an appropriate interval and does not hinder stretchability (elongation recovery), which is an important element of the present invention. Proceeding from this point of view, the preferred range for developing good stretchability while playing the role of fixing large loops is that the crossing point is preferably 5 to 15 / mm. Can do.

  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 3.0 mm from the yarn surface using a photoelectric fluff measuring machine (TORAY FRAY COUNTER) under the 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 locations are measured in millimeters up to the second small end point. 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 in the range of 1.0 mm or more and 100.0 mm or less, and within this range, the present invention is coupled with the crimped structure of the sheath yarn. 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.

  The shape of the loop made of the sheath yarn here is the one that protrudes from the core yarn to the outer layer starting from the crossing point, and its shape is a knurled loop (rather than an arch loop formed by general entanglement) (Teardrop shape) is preferable. 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 addition, it is preferable that the sheath yarn has a three-dimensional crimped structure from the viewpoint of suppressing entanglement between the sheath yarns, and by adopting this, it is possible to dramatically increase the bulk due to the synergistic effect with the loop shape. It has also been found that expression is possible.

  On the other hand, the inventors have found that when the large loop made of the sheath thread is broken or partially deteriorated in the middle, the above-mentioned effect tends to decrease. For this reason, it is important that the sheath yarn is not broken in the middle of the loop from the viewpoint of satisfying the contradictory properties of suppressing bulkiness and entanglement which are not present in the past.

  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 can be sufficiently exhibited.

  The sheath yarn of the present invention preferably has a three-dimensional crimped structure. The three-dimensional crimped structure here means that the filament single yarn as exemplified 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 three-dimensional crimp size of the sheath yarn is expressed by a latent crimp yarn collected by a general manufacturing method such as conventional side-by-side composite fibers and hollow fibers. It is preferable to be in the milli order (10 ⁻³ m) rather than the micron order (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 present invention, the radius of curvature of the spiral structure is preferably in the range of 2.0 to 30.0 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 is more preferably 2.0 to 20.0 mm, and within this range, it means that the large loop made of the sheath yarn has a spring-like crimp. 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.

  What is necessary 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. There is a need. 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 present inventors have promoted a study focusing on the form of the raw yarn in order to achieve entanglement suppression between the processed yarns 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 structure yarns are conversely present 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 structured 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 2.0 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). In addition, in this invention, if it is not required, processing, such as opening, is not performed but it evaluates by arranging a processed thread in parallel with a 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 a 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 2.5. 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 fibers produced under the same yarn-making conditions and use them for the core yarn and the sheath yarn. A single fiber made of a resin is preferable.

  From the viewpoint of reducing the friction coefficient and suppressing entanglement in such processed yarn, it is preferable that the core yarn has a three-dimensional crimped structure in addition to the sheath yarn. This is because, even in the core yarn, when the yarn is in a free state at the crossing point of the core yarn that substantially fixes the sheath yarn, the crossing point is derived from the three-dimensional crimp of the core yarn. Is in a state that exists. When such a processed 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 soft texture of the present invention are increased. This is because the effect becomes more prominent. On the other hand, when tension is applied to the processed yarn, the sheath yarn is stretched to increase the binding force at the crossing point, thereby preventing the loop from breaking and the sheath yarn from falling off. To do. 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 method for evaluating the three-dimensional crimp of 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 substantial upper limit of the single yarn fineness in the present invention is 50.0 dtex.

  The bulky processed yarn of the present invention needs to have an elastic modulus of 80 cN / dtex or less. Here, the elastic modulus was obtained from the inclination by obtaining a stress-strain curve of the processed yarn under the conditions shown in JIS L1013 (1999), linearly approximating the initial rising portion. This operation is evaluated for 5 samples for each level, a simple average value of the obtained results is obtained, and the value is obtained by rounding off the second decimal place.

  This elastic modulus represents the rigidity at the time of elongation deformation of the processed yarn. If this value is too high, it means that the processed yarn is not easily stretched and deformed flexibly. On the other hand, when the elastic modulus is 80 cN / dtex or less, it means that the processed yarn can be flexibly deformed while having an appropriate resistance to the initial deformation, and is the object of the present invention. It means that it has excellent properties. For example, when sewing on a jacket, it is naturally preferable to change the characteristics of the sample as appropriate according to the region, but the elastic modulus is particularly large for the movable elbow and the region around the knee. It is preferably 65 cN / dtex or less. In addition, it is particularly preferable that the elastic modulus is 55 cN / dtex or less with respect to a part where the stiffness may be uncomfortable, such as a neck circumference or a waist circumference. The practical lower limit of the elastic modulus in the present invention is 10 cN / dtex.

Further, as an important requirement for achieving the object of the present invention, it is important that the elongation recovery rate at the time of 10% elongation of the processed yarn is 50% or more. The elongation recovery rate mentioned here can be evaluated with a tensile tester used to evaluate the above-described elastic modulus. That is, using a tensile tester, the processed yarn is stretched by 10% under the conditions of a sample length of 20 cm and a tensile speed of 100% / min, then left for 1 minute, and recovered to the original sample length position at the same speed. This operation was repeated 10 times, and the stress-strain curve at this time was recorded, and the length at the time of 10% elongation (S0) and the length when the stress became 0 (S1) were obtained. Obtain the elongation recovery rate. It is a value obtained by evaluating the same operation for 5 samples for each level, obtaining a simple average value of the obtained results, and rounding off to the first decimal place.
Elongation recovery rate (%) = (S0−S1) / S0 × 100
[S0: Length at 10% elongation, S1: Length when stress becomes 0]
The bulky structure yarn of the present invention can fully exert its effect when utilized in a particularly mobile part, but the elongation recovery rate is 50% or more when repeatedly stretching and recovering. It means that the elastic properties and the settling resistance are excellent. In applications where the bulky processed yarn of the present invention is used, the strain repeatedly applied is 10% or less, and it is preferable that the elongation recovery rate in this strain is excellent. Proceeding from this point of view, the higher the elongation recovery rate referred to here, the closer to rubber elastic deformation, and the material exhibiting excellent stretch properties. The practical upper limit in the present invention is 100%. When the bulky structured yarn of the present invention is used for general clothing such as inner and outer and bedding such as a futon or pillow, the elongation recovery rate is preferably 55% or more. Further, in sports apparel applications where the use situation is relatively severe, it is particularly preferable that the elongation recovery rate is 70% or more.

  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 structure yarn of the present invention has a stretch property, and in order to develop a stretch property that has not been heretofore, the present inventors have intensively studied and as a result, adjusted the properties of the core yarn, after processing. The present inventors have found that a comfortable stretch property is expressed in the bulky processed yarn. In order to achieve this stretch property, the core yarn can be expressed in principle if it is excellent in elongation recovery, but in order to achieve the object of the present invention, the crossing point of the core yarn and the sheath yarn must be large. It is preferable to generate the loop to the extent that it is formed, which is an important requirement from the standpoint of preventing looseness of the bulky processed yarn. As a result of intensive studies under such a viewpoint, the fiber used for the core yarn of the present invention is from the viewpoint that the openability of the processed yarn is good and the necessary crossing points are formed in the processing described later. Is preferably a side-by-side type or an eccentric core-sheath type composite fiber.

  The side-by-side type composite fiber referred to here is an A polymer (7 in FIG. 4) and a B polymer having different characteristics in the fiber cross section perpendicular to the fiber axis as exemplified in FIG. 4 (4-1). (8 in FIG. 4) means a fiber having a bonded form. In addition, the eccentric core-sheath type composite fiber is an A polymer (FIG. 4 (4-4)) on the fiber cross section in the direction perpendicular to the fiber axis, as illustrated in FIG. This means a fiber having a form in which 7) of 2) is arranged, and B polymer (7 of FIG. 4 (4-2)) is arranged so as to cover it.

  All of these fibers develop crimps according to the shrinkage difference between the A polymer and the B polymer and the fiber diameter. According to this crimp, the stretch performance of the present invention is exhibited. The crimps developed by the composite fiber are generally on the order of micrometers, which forms a good fixing point for the large loops to be self-supporting. In the raw yarn stage, it is a relatively flat fiber form, and it is suitable for the durability of the bulky processed yarn and the running property at the time of processing to express fine crimp after processing. Viscosity polyethylene terephthalate / low viscosity polyethylene terephthalate and polybutylene terephthalate / polyethylene terephthalate side-by-side and eccentric core-sheath composite fibers are more preferred.

  The fibers used in the present invention are preferably hollow cross-section fibers. As an advantage of the manufacturing method described later, in addition to the fact that the three-dimensional crimp size in millimeter order, which is a preferred form of the sheath yarn, can be controlled relatively freely from a large size to a small size, It is suitable from the standpoint of independence. 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. Therefore, 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, a hollow cross-section fiber having a hollow ratio of 20% or more is more preferable. The hollow ratio referred to here is obtained by two-dimensionally photographing a cut surface of a hollow section fiber at a magnification at which 10 or more fibers can be observed with an electron microscope (SEM). 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.

  The hollowness mentioned here is preferably a bulky structural yarn having an air layer, and particularly preferably has a hollowness of 30% or more, from the viewpoint of light weight and heat retention, which is the object of the present invention. . 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 has excellent heat retention. It is. The substantial upper limit of the hollow ratio in the present invention is 50%.

  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.

  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 stretching conditions, for example, in a stretching machine composed of a pair of rollers or more, if the fibers are made of a polymer that generally shows a synthetic fiber that can be melt-spun, the first roller that is set to a temperature not lower than the glass transition temperature and not higher than the melting point; By the peripheral speed ratio of the second roller corresponding to the crystallization temperature, the second roller is stretched in the fiber axis direction 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 cross-sectional shape of the synthetic fiber of the present invention is not particularly limited, and by changing the shape of the discharge hole in the spinneret, a general round cross section, a triangular cross section, a Y type, an eight leaf type, a flat type It is possible to make it irregular such as various types and hollow types. Moreover, it does not need to be a single polymer, and may be a composite fiber composed of two or more types of polymers. However, from the viewpoint of expressing the three-dimensional crimp of the sheath yarn, which is an important requirement of the present invention, among the above, a side-by-side type composite fiber in which a hollow cross section and two kinds of polymers are bonded is used. Is appropriate. That is, these fibers are characterized in that a three-dimensional crimp is developed from a structural difference in the cross-sectional direction by performing a heat treatment after the yarn production and the yarn processing. For this reason, at the time of fluid processing, which will be described later, although it is a so-called straight fiber, a three-dimensional crimp is developed by performing 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 crimp development after the heat treatment, the fiber used in the present invention is more preferably a hollow cross-section fiber. In the case of a hollow cross-section fiber, it has an air layer with low thermal conductivity at the center of the fiber. For this reason, for example, after discharging from a spinneret that can form a hollow cross section, one side is forcibly cooled with excessive cooling air or the like, or one side is excessively heat treated with a heating roller or the like during stretching, so that the fiber cross-sectional direction This creates a structural difference. In the case of hollow cross-section fibers, in addition to being able to produce yarn with a single spinning machine, the size of the three-dimensional crimp can be controlled relatively freely from a large size to a small size by the above-described operation. . 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 preferably a hollow cross-section fiber having a hollow ratio of 20% or more, and a hollow cross-section fiber having a hollow ratio of 30% or more. It is particularly preferred.

The bulky structured yarn of the present invention supplies the above-described core yarn (17 in FIG. 5) and sheath yarn (18 in FIG. 5) by a supply roller (16 in FIG. 5) having a nip roller or the like, and jets compressed air. The first step is to suck the core yarn and sheath yarn with a suction nozzle (9 in FIG. 5) capable of
In this suction nozzle (9 in FIG. 5), the flow rate of pressurized 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 processed yarns with loops using interlaced nozzles or taslan processing nozzles that give the effect of disturbance, opening and entanglement to the running yarn in the nozzles. is not. 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 (10 in FIG. 5), which is the base point at which this turning force is expressed, is started by causing the traveling yarn to detach from the accompanying airflow. Specifically, it is sufficient to change the yarn path with a bar guide or the like. The take-up roller (12 in FIG. 5) in the traveling direction of the running yarn pulls the running yarn at a specified speed, thereby 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 (10 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 (11 in FIG. 5) in which a large loop of sheath yarn is formed is subjected to a 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 (13 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 that has been subjected to the heat treatment process may be wound up with a winder or the like having a tension control function (15 in FIG. 5) by regulating the speed via a delivery roller (14 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 fibers (strength, elastic modulus)
Using a tensile tester Tensilon UCT-100 manufactured by Orientec Corp., a stress-strain curve is measured under the conditions of a sample length of 20 cm and a tensile speed of 100% / min. The strength at the time of breaking was read and the strength was calculated by dividing the load by the initial fineness. The elastic modulus was obtained from the slope of the initial rising portion of the stress-strain curve obtained by linear approximation. Each value is a value obtained by evaluating this operation for five samples for each level, obtaining a simple average value of the obtained results, and rounding off to the first decimal place.

C. Elongation recovery rate of fiber The fiber is stretched 10% under the conditions of a tensile tester Tensilon UCT-100 type manufactured by Orientec Co., Ltd. under the conditions of a sample length of 20 cm and a tensile speed of 100% / min. Restore to original sample length position. This operation was repeated 10 times, and the stress-strain curve at this time was recorded, and the length at the time of 10% elongation (S0) and the length when the stress became 0 (S1) were obtained. The elongation recovery rate was determined. It is a value obtained by evaluating the same operation for 5 samples for each level, obtaining a simple average value of the obtained results, and rounding off to the first decimal place.
Elongation recovery rate (%) = (S0−S1) / S0 × 100
[S0: Length at 10% elongation, S1: Length when stress becomes 0]
D. Loop evaluation (size, frequency, break)
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 locations are measured in millimeters up to the first small end point. The average value of these numerical values was calculated, and the value obtained by rounding off after the decimal point was defined as the loop size in the present invention.
For the same 10 images, the number of loop tips per unit distance and the breaking point of the sheath yarn were counted, and the number of loops per millimeter and the breaking point were evaluated. The same operation was performed on 10 images, and a value obtained by rounding off the decimal point of the average value was evaluated as a loop frequency. In addition, regarding the breaking point of the loop, the counted breaking points of the loop were averaged, and the second breaking point of the small end point was rounded off 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: ○), Evaluated as being broken (evaluation: x).

E. 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.

F. 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.

G. Unraveling (suppressing effect of fastener phenomenon)
A drum wound with 500m or more of processed yarn is creeled and released in the cross-sectional direction of the drum for 5 minutes at a speed of 30m / min, and the yarn dancing and catching due to the fastener phenomenon is visually confirmed and evaluated in the following four stages. .

  A: Yarn dance is not seen and can be solved well.

  ○: Can be solved without any problem of slight yarn dance.

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

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

H. Tactile feeling A drum around which a processed yarn is wound for 500 m or more was placed on a creel, and the yarn was unwound into a winding shape using a measuring machine in the cross-sectional direction of the drum to obtain a 10 m yarn cassette. A sample for texture evaluation was prepared by fixing one portion of the yarn cassette. The tactile sensation when gripping this sample was evaluated according to the following four levels.

  (Double-circle): It is excellent in bulkiness and flexibility, and the outstanding texture which does not feel a foreign material feeling.

  ○: Good texture with bulkiness and flexibility.

  (Triangle | delta): The favorable texture which has a bulkiness and does not feel a foreign material feeling.

  X: Poor texture that is not bulky and feels a foreign body.

Example 1
High viscosity polyethylene terephthalate (PET1: IV = 0.8 dl / g) is prepared as A polymer, and low viscosity polyethylene terephthalate (PET2: IV = 0.5 dl / g) is prepared as B polymer. After melting at 295 ° C., weighed Then, it was made to flow into a spinning pack equipped with a composite base and discharged so as to have a side-by-side composite cross section composed of A polymer and B polymer as exemplified in FIG. 4-1 (composite ratio: A polymer / B polymer = 50/50). The discharged yarn was blown with 20 ° C. cooling air at a flow rate of 20 m / min to cool and solidify, and after applying the spinning oil, the undrawn yarn was wound at a spinning speed of 1500 m / min. A composite fiber (single yarn fineness: 7.0 dtex) obtained by stretching the undrawn yarn wound up by 3.0 times between rollers heated to 90 ° C. and 140 ° C. at a drawing speed of 800 m / min was used as a core yarn.

  Next, polyethylene terephthalate (PET3: IV = 0.6 dl / g) was melted at 290 ° C., weighed and poured into a spinning pack, and three slits (width 0.1 mm, FIG. 6) illustrated in FIG. No. 20) was discharged from the hollow section discharge holes arranged concentrically so that the hollow ratio was 30%. A 20 ° C. cooling air was blown from one side to the discharged yarn at a flow rate of 30 m / min to cool and solidify, and then a spinning oil was applied, and the undrawn yarn was wound at a spinning speed of 1500 m / min. Subsequently, hollow fibers (single yarn fineness 6.5 dtex) obtained by stretching the wound undrawn yarn by 3.0 times at a drawing speed of 800 m / min between rollers heated to 90 ° C. and 140 ° C. were used as sheath yarns.

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

In Example 1, a large loop made of sheath yarn protruded from the surface of the yarn by an average of 38.0 mm, and the bulky processed yarn was formed with a frequency of 22 loops / mm. This protruding loop was excellent in uniformity in size and period. In addition, the sheath yarn of the processed yarn has a three-dimensional crimped structure with a radius of curvature of 5.7 mm and a continuous loop in which no breakage is seen in the large loop of the sheath yarn. Met. (Break location: 0.0)
Subsequently, a silicone oil containing polysiloxane at a concentration of 8 wt% in the processed yarn was sprayed uniformly so that the final polysiloxane adhesion amount was 1 wt% with respect to the bulky structure yarn, and the temperature was 165 ° C. The bulky structure yarn of the present invention was collected by heat treatment for 20 minutes.

  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 unraveling property of the processed yarn is not a problem. It was possible to unwind from a drum that had been wound smoothly without causing any problems (unraveling property: ◎). Further, the bulky processed yarn of the present invention had a comfortable stretch property with an elastic modulus representing rigidity of 73 cN / dtex and an elongation recovery rate of 83% (texture:）). The results are shown in Table 1.

Example 2
Example 1 except that the PET / PET2 side-by-side composite fiber having a single yarn fineness of 3.0 dtex was used as the core yarn by adjusting the discharge rate with the combination of polymers used in the core yarn of Example 1. It carried out according to.

  In Example 2, the frequency of the loop is slightly increased by reducing the single yarn fineness of the core yarn, and it is easy to be deformed at the time of extension deformation and becomes a soft texture compared to Example 1. there were. The results are shown in Table 1.

Examples 3 and 4
PBT / PET2 side-by-side composite fiber collected by changing the A polymer to polybutylene terephthalate (PBT: IV = 1.2 dl / g), spinning at a temperature of 290 ° C. and using the composite die used in Example 1 Example 3 was carried out according to Example 1 except that was used as the core yarn (Example 3). Further, the same polymer combination as in Example 3 was used, and by adjusting the discharge amount, a bulky structured yarn having a core yarn of PBT / PET2 side-by-side composite fiber having a single yarn fineness of 3.0 dtex was collected (Example 4). ).

  In Example 3 and Example 4, the core yarn exhibited relatively fine crimps at the raw yarn stage, and the bulky processed yarn had a reduced loop frequency. Moreover, compared with Example 1, the elastic modulus was low, it was very flexible, and it extended and deformed with low stress. In addition, the stretch recovery rate is greatly improved, and even when deformed to a relatively high degree, there is no stickiness and the material is suitable for use in a part having a large movable range. The results are shown in Table 1.

Comparative Example 1
Polyethylene terephthalate (PET3: IV = 0.6 dl / g) used for the sheath yarn of Example 1 was melted at 290 ° C., weighed and poured into a spinning pack, and three slits as illustrated in FIG. It discharged so that it might become 30% of hollow ratio from the discharge hole for hollow sections arrange | positioned width 0.1mm and 20) of FIG. The cooling air at 20 ° C. was increased (100 m / min) compared to Example 1 and sprayed onto the yarn from one side to cool and solidify, and then a spinning oil was applied, and the undrawn yarn was wound at a spinning speed of 1500 m / min. . Subsequently, hollow fibers (single yarn fineness 6.5 dtex) obtained by stretching the wound undrawn yarn by 3.0 times between rollers heated to 90 ° C. and 140 ° C. at a drawing speed of 800 m / min were used as core yarn and sheath yarn. Except for this, everything was carried out according to Example 1.

  In Comparative Example 1, the shape characteristics of Example 1 were almost the same, but the loop size was small and the loop frequency was reduced. Although it is relatively excellent in unraveling property and texture, it has a high elastic modulus and a low elongation recovery rate, and does not achieve the object of the present invention. The results are shown in Table 2.

Comparative Example 2
The same procedure as in Example 1 was performed except that a nozzle whose pressure injection angle was changed to 90 ° and a turning point by a ceramic guide was not provided. However, in Comparative Example 2, at the same pressure air flow rate as in Comparative Example 1, the entanglement of the core yarn and the sheath yarn is excessive, and nozzle clogging occurs, so the air velocity is reduced to 200 m / s, which is half of Comparative Example 1. Thus, the processed yarn was collected and the characteristics were evaluated (Comparative Example 2).

  In the processed yarn of Comparative Example 2, the loop size of the sheath yarn was smaller than that of Example 1 and Comparative Example 1 before the heat treatment, and was formed with a very short period. When the sheath yarn was crimped, a loop was formed in the yarn, but the bulkiness was poor. When the details of the loop composed of the sheath yarn were confirmed, spots were observed in the loop size, and relatively many break points that could not be confirmed before the heat treatment were observed (with break: break point 0.5). The results are shown in Table 2.

Comparative Example 3
Using the processed yarn of Comparative Example 2, the processed yarn was rubbed with a pair of rubber discs and subjected to an open twist treatment (Comparative Example 3). Although the apparent bulkiness seems to be improved, the loop breakage is further increased compared with Comparative Example 2, and the entanglement of the sheath yarns is promoted, and when compressed, there is a feeling of foreign matter. It was something that was felt. Further, even when compared with Comparative Example 2, the yarn was caught more often during unwinding, and the unwinding property was also lowered. The results are shown in Table 2.

Example 5
A 3GT / PET2 side-by-side composite sampled by changing the A polymer to polytrimethylene terephthalate (3GT: IV = 1.2 dl / g), spinning the spinning temperature at 280 ° C., and using the composite die used in Example 1 Except that the fiber was used as the core yarn, all operations were performed according to Example 2 (single yarn fineness: 3.0 dtex).

  In Example 5, the loop frequency decreased compared to Example 1, and the elongation recovery rate decreased due to the crimping of the core yarn extending during processing, but the stretchability was sufficiently ensured. And had a soft texture due to a decrease in elastic modulus. The results are shown in Table 3.

Examples 6 and 7
Except that the feeding speed was changed to 50 m / min for core yarn, 500 m / min for sheath yarn (Example 6), 20 m / min for core yarn, and 1000 m / min for sheath yarn (Example 7), all were carried out according to Example 1.
In Example 6 in which the supply speed ratio was reduced, the loop size was 35 mm, which was slightly smaller than that in Example 1. However, the stretch properties that are the characteristics of the present invention were equivalent, and the texture was good. It was.
In Example 7 in which the supply speed ratio was increased, the loop size was 60 mm, which was larger than that in Example 1, but there was almost no slack in the loop. As for the texture, although it had excellent bulkiness with flexibility, the structure was also excellent in unwinding because it had a structure in which cutting of the sheath yarn and sagging were suppressed. The results are shown in Table 3.

Example 8
All were carried out in accordance with Example 7 except that the air velocity was changed to 500 m / s.

  In Example 8, by increasing the air flow velocity, the tension between the nozzle and the take-up roller was lowered, and the running of the processed yarn was slightly disturbed, but the processed yarn could be collected without any problem. In the processed yarn, the loop tarmi was rarely seen, but the unraveling property is not a problem, and it is possible to collect the bulky structure yarn having the stretch property that is the feature of the present invention. It was. The results are shown in Table 3.

Examples 9, 10
The composite fibers used for the core yarn were all carried out in accordance with Example 2, except that the ratio of A polymer to B polymer was changed to 60/40 (Example 9) and 30/70 (Example 10).

Example 9 had substantially the same characteristics as Example 2 because there was no significant difference in the crimped form of the core yarn and it did not greatly affect the form of the loop of the processed yarn.
In Example 10, since the crimped form of the core yarn was reduced, the loop frequency was reduced, and the elongation recovery rate was increased as compared with Example 2. The results are shown in Table 4.

Examples 11 and 12
The eccentric core-sheath composite fibers of PET1 / PET2 (Example 11) and PBT / PET2 (Example 12) obtained by using the composite die having the eccentric core-sheath composite cross section illustrated in FIG. Example 2 was carried out except that it was used for the yarn.

  In Example 11, the loop frequency was slightly lower than that in Example 2. On the other hand, in Example 12, as compared with Example 4, the loop frequency was increased, and the restraint between the sheath yarn and the core yarn was increased, so that the stretchability was improved. The results are shown in Table 4.

Comparative Example 4
All were carried out in accordance with Comparative Example 2 except that the hollow cross-section PET fiber used in Comparative Example 2 was used as the core yarn and the 3GT / PET2 side-by-side composite fiber used in Example 5 was used as the sheath yarn.

  In the sample of Comparative Example 4, the sheath yarn exhibited a three-dimensional crimped form after heat treatment, but the fiber forming the loop had a very fine curvature radius of several tens of micrometers. In some places, breakage of the sheath yarn was observed (with breakage: 0.4 pieces / mm). Further, by expressing this crimped form, the loop of the sheath yarn was greatly reduced as compared with that before the heat treatment, and the number exceeding 0.6 mm from the yarn surface was small. For this reason, although the tactile sensation of the processed yarn is rubber-like and unique, it does not have the bulkiness and flexibility that are the object of the present invention. In addition, microcrimping of micrometer order, rupture of sheath yarn and unevenness of loop protrusion, the coefficient of static friction between fibers is relatively high (0.4), and the unwinding property of the drum is good. It was something I wanted. The results are shown in Table 4.

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 A polymer 8 B polymer 9 Suction nozzle 10 Turning point 11 Processed thread 12 Take-up roller 13 Heater 14 Delivery roller 15 Winder 16 Supply roller 17 Core thread 18 Sheath thread 19 Pneumatic jet angle 20 Slit discharge hole

Claims (6)

The number of loops protruding 3 mm or more from the surface of the yarn in a bulky structure yarn composed of a sheath yarn that forms a continuous loop without breaking and a core yarn that substantially crosses the sheath yarn to fix the sheath yarn. Is a bulky structure yarn, characterized in that the elastic modulus is 80 cN / dtex or less and the elongation recovery rate at 10% elongation recovery is 50% or more. The single yarn fineness of the constituent fibers is 3.0 dtex or more, and the single yarn fineness ratio (sheath / core) of the core yarn and the sheath yarn is in the range of 0.5 to 2.5. The bulky structure yarn described. 3. The core yarn is a side-by-side type or eccentric core-sheath type composite fiber, and the fiber constituting the sheath yarn is a three-dimensional crimped structure yarn having a curvature radius of 2 mm to 30 mm. Bulky structure yarn. The bulky structure yarn according to any one of claims 1 to 3, wherein a coefficient of static friction between fibers is 0.3 or less. The bulky structure yarn according to any one of claims 1 to 4, wherein both the core yarn and the sheath yarn are made of hollow cross-section fibers having a hollow ratio of 20% or more. A textile product comprising at least a part of the bulky structural yarn according to any one of claims 1 to 5.