TW201741511A - Bulky yarn - Google Patents

Abstract

The present invention is a bulky yarn having: a sheath yarn that has continuously formed loops without any breakages; and a core yarn that substantially fixes the sheath yarn by being interlaced with the sheath yarn. In the bulky yarn, the number of loops protruding from the yarn surface layer by not less than 3.0 mm is in a range of 1-30 loops/mm, the elastic modulus is not greater than 80 cN/dtex, and the extension recovery rate at the time of 10% extension recovery is not less than 50%. The present invention thus provides a bulky yarn having excellent touch feeling, excellent lightweight and moisture-retaining properties, and stretchability.

Description

Fluffy yarn

The present invention relates to a fluffy yarn in which a plurality of loops are formed in the surface layer portion, and is capable of achieving high heat retention while achieving a soft touch, and is applicable to a wide range of fields from the use of clothing materials to the use of industrial materials.

A synthetic fiber composed of a thermoplastic polymer such as polyester or polyamide may have high basic characteristics such as mechanical properties and dimensional stability, and is excellent in balance. Therefore, the fiber material obtained by using such a fiber is characterized by the properties of the polymer to exhibit basic properties, and is also formed into various structural forms by high-order processing, thereby not only being used for clothing but also for interior decoration. It is widely used in vehicle interiors, industrial applications, and the like.

The development of novel technologies related to synthetic fibers can be said to be technological innovations that are motivated by the imitation of natural materials. In order to exhibit the functions of natural complex structures by synthetic fibers, various techniques have been carried out. proposal. For example, there are already: the expression of the specific hand (roughness, softness) that mimics the cross section of the silk, the tectonic hair color represented by the morpho butterfly, and the water repellency seen on the lotus leaf. One of them, one of which is the study of the soft hand or light weight of natural feathers.

Natural feathers are generally mixed with a small amount of down balls (cotton grain) and feathers (feathers) collected by the waterfowl's chest. These are derived from the specific structural form of the keratin fiber, which has a soft hand and exhibits excellent light weight and heat retention along the body. Therefore, natural feathers are used as products for filling cotton, and their functions are recognized even by ordinary users, and are widely used in clothing articles such as beddings and jackets.

However, from the point of view of nature conservation, the capture of waterfowl is limited and the total production of natural feathers is regulated. Furthermore, due to the recent occurrence of abnormal weather or infectious diseases, the supply thereof has largely changed, the price has risen, and unstable supply has gradually been regarded as a problem. In addition, although the use of natural feathers has been subjected to many steps such as picking, sorting, disinfecting, and degreasing, the unique odor and animal allergy have frequently become problems. In addition, from the viewpoint of animal protection, actions to exclude the use of natural feathers have also appeared in Europe and the like. Therefore, a quilted material system which can be stably supplied with a synthetic fiber or the like is attracting attention.

There are many proposals for quilted materials composed of synthetic fibers since the past, but there are no examples of natural feathers at the point of basic characteristics such as bulkiness, compression recovery, and soft hand feeling.

For example, as shown in Patent Document 1 and Patent Document 2, the bulkiness of the structure is improved by making the fiber assembly state spherical or radial.

In the yarn processing technique used for the purpose of increasing the added value of fibers, for example, it is generally known that the fiber can be untwisted after the application of the fiber, or the fluid processing nozzle or the like. Two or more types of fibers are blended to produce a processed yarn having a bulkiness. Since the processed yarn having such a bulkiness is basically a long fiber, it can be processed into various forms, and it can be applied to a quilted material in consideration of the bulkiness and soft hand of the processed yarn.

Patent Document 3 discloses a technique in which two types of fibers are used, and a yarn is supplied to a waist gauge while imparting a pendulum or the like to one of the fibers, and the fibers are collected and applied, and fibers imparted with a pendulum or the like are used. , forming a loop on the surface. Then, it is further rubbed by rubbing with two discs or the like to obtain a fluffy processed yarn. Indeed, according to this technique, it is possible to obtain a fluffy yarn having a loop composed of a sheath yarn by adjusting the degree of the pendulum or the like according to a conventional technique.

Patent Document 4 is a technique for ejecting compressed air from a vertical direction in a sliver traveling in an entanglement nozzle to open and entangle the yarn, and to fix the excess supplied sheath yarn by the yarn length difference. According to Patent Document 4, it is possible to obtain a bulky entangled yarn in which a sheath yarn having a loop shape exists on the surface layer.

Prior technical literature Patent literature

Patent Document 1 Japanese Patent Publication No. 48-7955

Patent Document 2 Japanese Patent Publication No. 51-39134

Patent Document 3 Japanese Patent Laid-Open Publication No. 2011-246850

Patent Document 4 Japanese Patent Laid-Open Publication No. 2012-67430

Patent Document 1 and Patent Document 2 are those in which a foreign body feels when compressed, and the soft feeling of natural feathers is not obtained. In such a fiber structure mainly composed of short fibers, the bulkiness and flexibility (compression recovery) of the structure are attributed to the mechanical properties or the fineness (thickness) of the fibers used. Therefore, in order to balance the characteristics of bulkiness and softness, such as natural feathers, further improvement is required.

Patent Document 3 applies a loop yarn which is partially protruded from a sheath yarn, and when the mechanical twisting machine is rubbed by an eraser or the like, the protruding loop is partially broken or Deterioration. When the processed yarn is used as the quilting, it is filled in a bundle of several to several tens of pieces, and the portion (flock) which is deteriorated is significantly combined with the sheath yarn of the other processed yarn. This warp-knitted sheath yarn may cause a foreign body sensation during filling to impair the hand feeling, or may promote the twisting, and the fluffiness may be reduced over time.

In Patent Document 4, when the traveling sliver in the nozzle is disturbed and the fiber is opened and entangled, the yarn is swung in a very short cycle, and the kneading of the traveling sliver occurs. Therefore, the small loops naturally affected by the nozzle shape are excessively formed at a high frequency. Further, since the sheath yarn is randomly entangled with the core yarn, the size of the loops fluctuates in the fiber axis direction, resulting in restriction in bulkiness. Further, the loop yarn formed in the nozzle is retained inside the nozzle and then discharged to the outside of the nozzle by the jet air. Therefore, in the direction of the fiber axis of the processed yarn, the size of the loop or the length of the sheath yarn forming the loop changes to form a slack. At this time, in particular, the sheath yarn having the slack is easily combined with other sheath yarns, and the problem of foreign matter sensation caused by the process passability in the high-order processing or the place where the sheath yarn is joined is left.

In addition, when the processed yarns described in Patent Document 3 and Patent Document 4 are used for quilting, in addition to the problems related to bulkiness and hand feeling as described above, the yarn is processed for the purpose of suppressing winding or twisting. Both ends are fixed and used. However, in the processed yarn described in Patent Document 3 or Patent Document 4, since the processed yarn itself has no extensibility, the entangled yarn fixed to a fixed length is stretched in the filler, and there is no margin in design or size. Degrees can be uncomfortable. In particular, when sewn into clothing or the like, since the elbow or the knee, the neck, or the waist circumference having a large range of motion must be designed to have a margin, excessive voids are formed, and the function of the heat retaining property or the like cannot be sufficiently exhibited. .

Therefore, it is desirable to have a fluffy yarn which can suppress the kneading between the processed yarns even if it has extremely high bulkiness due to the loops and has good elasticity.

It is an object of the present invention to provide a fluffy yarn suitable for use in high performance insulation materials.

The above problems are achieved by the following means.

(1) A fluffy yarn comprising a sheath yarn which forms a loop which is continuous without breaking, and a fluffy yarn which is substantially fixed to the core yarn of the sheath yarn by interlacing with the sheath yarn, wherein the surface of the yarn protrudes 3.0 mm The number of the above loops is 1/mm to 30/mm, the modulus of elasticity is 80 cN/dtex or less, and the elongation recovery rate at the time of 10% elongation recovery is 50% or more.

(2) The fluffy yarn according to (1), wherein 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.

(3) The fluffy yarn according to (1) or (2), wherein the core yarn is a conjugate fiber of a side-by-side type or an eccentric core-sheath type, and a three-dimensional crimping structure of a fiber system having a curvature radius of 2.0 mm to 30.0 mm of the sheath yarn. yarn.

(4) A fluffy yarn according to (1) or (2), wherein the sheath yarn is contained in a fluffy yarn comprising a sheath yarn forming a loop and a core yarn substantially fixed by the sheath yarn A composite fiber having a continuous loop and having a density of less than 1.00 g/cm ³ without substantially breaking.

(5) The fluffy yarn according to (4), wherein the sheath yarn has a three-dimensional crimping structure.

(6) The fluffy yarn according to (4) or (5), wherein the sheath yarn is a sea-island composite fiber having a hollow cross section with a hollow ratio of 20% or more.

(7) The fluffy yarn according to (6), wherein the island component of the sea-island composite fiber is composed of polyolefin, and the sea component is composed of polyester.

(8) A fluffy yarn according to (1) or (2), wherein the sheath yarn having a three-dimensional crimping structure forming a loop and the core yarn substantially fixing the sheath yarn by being interlaced with the sheath yarn In the fluffy yarn, the 10% modulus is less than 1.5 cN/dtex, and the fiber elongation ratio at the time of load application is 1.1 or more, and the fiber length recovery rate after elongation is 80 to 100%.

(9) The fluff yarn according to (8), wherein the fiber elongation ratio at the time of load application is 1.5 or more, and the fiber length recovery ratio after elongation is 90 to 100%.

The fluffy yarn according to any one of (1) to (9), wherein a coefficient of static friction between fibers is 0.3 or less.

The fluffy yarn according to any one of (1) to (10), wherein the core yarn and the sheath yarn each comprise a hollow cross-section fiber having a hollow ratio of 20% or more.

(12) A fibrous product comprising the fluff yarn according to any one of (1) to (11) at least in part.

Since the fluffy yarn of the present invention has a fluffy structure in which a loop having a three-dimensionally crimped shape is formed on the surface layer, it is possible to exhibit a good touch without foreign body sensation by suppressing the twisting between the fluffy yarns. Excellent light weight, heat preservation and so on. In addition, since it has a comfortable elasticity that is deformed by a low stress, it is excellent in followability, such as adhesion, and is soft and elastically deformed, and does not form unnecessary voids. Therefore, it can be utilized even as A high-performance lightweight insulation material that is compact but still has a good wearing feel and excellent thermal insulation performance.

1‧‧‧sheath

2‧‧‧core yarn

3‧‧‧ yarn surface

4‧‧‧ yarn guides

5‧‧‧Distance from the surface of the yarn

6‧‧‧3 dimensional curling

7‧‧‧A polymer

8‧‧‧B polymer

9‧‧‧ Hollow

10‧‧‧ island ingredients

11‧‧‧ sea components

12‧‧‧Attraction nozzle

13‧‧‧ Turning point

14‧‧‧Processed yarn

15‧‧‧ traction roller

16‧‧‧heater

17‧‧‧Conveying roller

18‧‧‧Winding machine

19‧‧‧Supply roller

20‧‧‧core yarn

21‧‧‧sheath

22‧‧‧Spray angle of compressed air

23‧‧‧Slit-like spit hole

Fig. 1 is a schematic side view showing an example of a fluffy yarn of the present invention.

Fig. 2 is a simulation diagram for explaining a method of measuring a yarn surface.

Fig. 3 is a simulation diagram for explaining a 3-dimensional crimp (helical) structure.

Fig. 4 is a view schematically showing an example of a cross section of a side-by-side composite yarn and an eccentric core-sheath composite yarn constituting the fluff yarn of the present invention.

Fig. 5 is a view schematically showing an example of a cross section of a hollow island-in-the-sea composite yarn constituting the fluff yarn of the present invention.

Fig. 6 is a schematic flow chart showing an example of a method for producing a fluffy yarn of the present invention.

Fig. 7 is a schematic side view for explaining a suction nozzle used in the method for producing a fluffy yarn of the present invention.

Fig. 8 is a schematic cross-sectional view showing a discharge hole of a spinning nozzle for a hollow cross section used in the method for producing a fluffy yarn according to the present invention.

Form of implementing the invention

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

The fluffy yarn of the present invention is a fluffy yarn comprising a sheath yarn which forms a continuous loop without breaking, and a core yarn which substantially elastically fixes the sheath yarn by interlacing with the sheath yarn, which is characterized by the following fluffy yarn : The number of loops protruding from the surface of the yarn of 3.0 mm or more is 1 / mm to 30 / mm, the modulus of elasticity is 80 cN / dtex or less, and the elongation recovery rate at the time of 10% elongation recovery is 50% or more.

The fluffy yarn of the present invention is composed of a sheath yarn forming a loop and a core yarn which substantially elastically fixes the sheath yarn by interlacing with the sheath yarn. Further, in the present invention, the loop is not broken and a continuous loop is formed.

The fluff yarn of the present invention is preferably composed of synthetic fibers from the viewpoint of the processability at the time of fluff processing or the characteristics of the present invention in actual use. The synthetic fiber referred to herein means a fiber composed of a high molecular polymer. Among the high molecular polymers, the thermoplastic polymer which can be melt-molded can be used in the present invention because the fiber used in the present invention can be produced by a melt spinning method having high productivity.

Examples of the thermoplastic polymer referred to herein include polyethylene terephthalate or a copolymer thereof, polyethylene naphthalate, polybutylene terephthalate, and polytrimethylene terephthalate. A melt-formable polymer such as an ester, a polyolefin, a polycarbonate, a polyacrylate, a polyamide, a polylactic acid, or a thermoplastic polyurethane.

Among these thermoplastic polymers, a polycondensation-based polymer-based crystalline polymer typified by polyester or polyamine has a high melting point, and therefore, in the subsequent steps, forming, and actual use, even if it is a comparison High temperature heating is not degraded or fatigued and is preferred. From the viewpoint of heat resistance, the melting point of the polymer is preferably 165 ° C or higher.

Further, from the viewpoint of improving the lightweight of the fluffy yarn of the present invention, it is more preferable to use a low-density polypropylene of polyolefin in at least a part thereof. Here, in order to have not only lightweightness but also fatigue resistance for compression or the like, the molecular weight of the polypropylene used is suitably high, and the melt flow rate (MFR) as an index of molecular weight is higher. Suitably it is 20 g/10 min or less. The MFR referred to herein 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 tends to be. When the MFR of the polypropylene to be used is in such a range, it is less likely to be fatigued by compression or bending which is used as a fluffy yarn, and can be sufficiently withstand even if it is subjected to impact during processing, so that there is no process passability. problem. Further, when polypropylene is used in at least a part of the fluffy yarn of the present invention, it is particularly preferable to use an antioxidant-containing polypropylene in order to prevent oxidative heat generation when used in a clothing product or the like.

In the polymer used in the present invention, an inorganic substance such as titanium oxide, vermiculite or cerium oxide, a coloring agent such as carbon black, a dye or a pigment, a flame retardant, a fluorescent whitening agent, and the like may be contained in the polymer. Various additives such as an oxidizing agent or an ultraviolet absorber.

As illustrated in Fig. 1, the fluffy yarn of the present invention is composed of a sheath yarn forming a loop (1 of Fig. 1) and a core yarn (Fig. 1) which is substantially fixed by a sheath yarn interlaced with the sheath yarn. .

The core yarn as used herein refers to a filament which is present at 0.6 mm or less from the surface of the yarn (Fig. 2). This yarn surface means a line connecting the yarn path guides 4 when the machined yarn is hung between the pair of yarn guides (4 of Fig. 2). The filament which is present at a distance (5 in Fig. 2) of 0.6 mm or less from the surface of the yarn is the core yarn as described in the present invention and is the base point of the loop. Further, the filament which protrudes from the surface of the yarn by a distance of 3.0 mm or more and which is formed into a loop shape is the sheath yarn as described in the present invention, and is a fluffy person who is in charge of the fluffy yarn of the present invention. The present invention is characterized in that it comprises a core yarn for substantially fixing the sheath yarn forming the loop, but the term "substantially fixed" as used herein means that the sheath yarn is independent of the point at which the core yarn is interlaced. It means that the sheath yarn stands in the outer layer of the fluffy yarn to form a loop and stands on its own, starting from the intersection of the core yarn and the sheath yarn. Further, in the vicinity of the starting point of the loop, that is, the vicinity of the starting point of the loop, the filament bundle is often wound together. Therefore, a point at which a sheath yarn forming a loop apex of 3.0 mm or more from the surface of the yarn crosses a line which is 0.6 mm from the surface of the yarn is regarded as a staggered point.

The staggered point has the function of supporting the loops composed of the sheath yarns which are characteristic of the present invention, and is preferably present in a certain period of time. From this point of view, it is necessary to make the interlacing point of the core yarn and the sheath yarn in the fluffy yarn from 1/mm to 30/mm. If it is such a range, it means that a loop having a moderate interval exists and does not hinder the elasticity (elongation recovery) of an important element of the present invention. In the case of carrying out this viewpoint, it is preferable that the staggered point has a range of 5/mm to 15/mm as a preferable range while exhibiting a good shape of the terry.

The number of the loops per unit length in the fiber axis direction of the processed yarn is continuously evaluated by the core yarn and the sheath yarn, and can be carried out by using a photoelectric type fluff detecting device. For example, a photoelectric type fluff measuring machine (TORAY FRAY COUNTER) can be used to evaluate 0.6 mm and 3.0 mm from the surface of the yarn under the conditions of a yarn speed of 10 m/min and a traveling yarn tension of 0.1 cN/dtex.

The sheath yarn having the loop of the present invention is substantially fixed by the core yarn, and has a shape in which the cross section of the processed yarn protrudes to the outer layer direction.

The protrusion of the loop mentioned here is equivalent to the distance from the surface of the yarn (5 of Fig. 2), and the processed yarn which is hung on the pair of yarn guides is observed from the side 2 dimensionally. The observed image is measured by the person. For the 10 processed yarns that were randomly selected, photographs were taken in such a manner that the entire loop was observed, and 10 loops of the loops were photographed in each image. This operation is performed for a total of 10 images, and the total of 100 points to the second place of the decimal point is measured in millimeters. The average value of these numerical values is calculated, and the value obtained by rounding off the second decimal place or less is taken as the loop size (protrusion) in the present invention.

According to the review by the inventors of the present invention, the loop is preferably protruded from the surface of the yarn in a range of 3.0 mm or more and 100.0 mm or less. If it is in such a range, the crimped structure of the sheath yarn is complementary, and the present invention can be used without problems. The effect of the bulkiness of the invention and the inhibition of the fit. Moreover, it is more preferably 3.0 mm or more and 70.0 mm or less in consideration of workability of a fluffy yarn to be described later. Further, it is particularly preferable to apply a repeated compression recovery deformation in a severe environment such as a sports cloth or the like, and it is particularly preferably 5.0 mm or more and 60.0 mm or less.

Here, the shape of the loop formed by the sheath yarn is formed from the core yarn as a starting point from the staggered point to the outer layer, and the shape thereof is preferably closer to the water droplet than the arched loop formed by the entanglement. Type loop (teardrop shape). In the case of a teardrop type loop, the loop is substantially fixed at the point of intersection with the core yarn, so that the loop of the sheath yarn is easily restored to its original shape even after compression deformation, compared with the loop type loop. This formation is inherently suitable for exerting the resilience of fluffiness. Further, it is preferable that the sheath yarn has a three-dimensional crimping structure in order to suppress the twisting of the sheath yarns, and it has been found that by using this, it is possible to exhibit excellent bulkiness by utilizing the effect of multiplication with the loop shape.

On the other hand, in the review by the present inventors, it has been found that when the loop composed of the sheath yarn is broken or partially deteriorated in the middle, the above-described effect tends to be lowered. Therefore, in the conventional viewpoint of coexisting the opposite characteristics of the bulkiness and the suppression of the twisting, it is important that the sheath yarn is not broken in the middle of the loop.

The determination of the fracture was confirmed by randomly selecting 10 pieces from the processed yarn, and observing the interlaced points of the respective core yarns and the sheath yarns at a magnification of the following interlaced points (whole loops). In the 10 observations, 10 sheath yarns were observed to total the average of 100, and the break was 0.2 or less, which means that the sheath yarn formation in the present invention is not partially broken and continuous. The state of the loop. If it is such a range, the sheath yarn which is free at the yarn end should be substantially non-existent and can be present without being combined with other sheath yarns. When a conventional anti-twisting step is applied or a strong air jet is used to disturb and open the inside of the nozzle, the traveling sliver hits the inside of the nozzle formed by the metal at a high frequency. Crack or deterioration. Further, in order to form the loop of the present invention, the sheath yarn may be broken or largely deteriorated because it needs to be rubbed and untwisted between the rubber sheets or the like. Therefore, the ruptured sheath yarn is wound around the other sheath yarns, or the squeezing effect is promoted by the twisting, and as a result, the structural form of the processed yarn or the high-order processing is restricted. In the present invention, this point is greatly improved, and the sheath yarn can sufficiently exert the woven effect.

The sheath yarn of the present invention is preferably a three-dimensional crimping structure. The three-dimensional crimping configuration as used herein means a configuration in which a single yarn having a filament as illustrated in Fig. 3 has a spiral. In the evaluation of the three-dimensional crimping, ten single yarns were randomly selected from the processed yarns, and ten or more single yarns were collected, and each of the single yarns was observed by a digital microscope or the like to confirm the magnification of the crimped form. In this image, when the observed single yarn has a form that is rotated in a spiral shape, it is determined that the single yarn has a three-dimensional crimping structure, and when it is in the form of a straight line, it is determined that the crimping structure is not provided.

In order to make the present invention more effective, the sheath yarn has 3 compared with the micron-sized (10 ^-6 m) exhibited by the conventionally produced composite fiber or hollow fiber in the conventional process. The radius of curvature of the secondary convolution is preferably in the order of millimeters (10 ^-3 m). In the present invention, by the size of the three-dimensional crimping, the bulkiness and the resilience of the circumferential direction and the cross-sectional direction of the processed yarn can be freely controlled, and of course, the resilience can be utilized to achieve the suppression of one of the objects of the present invention. The sheath yarns are combined with each other. In particular, by making the size of the crimped to the millimeter level, it is excellent from the viewpoint of the fact that the bulkiness and compressibility of the sheath yarn coexist and the balance of the sheath yarn is suppressed.

In the present invention, the radius of curvature of the spiral structure is preferably in the range of 2.0 mm to 30.0 mm. The radius of curvature of the spiral structure as described herein is defined by the same method as the above-described determination of the presence or absence of the ternary convolution, and is defined as a bend formed by a fiber having a spiral structure in an image observed by a two-dimensional microscope such as a digital microscope. (6 of Fig. 3) The length corresponding to the radius of the true circle that is at most two or more inscribed. Ten or more single yarns are collected from each of the ten randomly selected yarns, and the single yarns are observed by a digital microscope or the like to confirm the magnification of the crimped form, and a total of 100 single yarns are measured in millimeters. The second decimal place. The simple average of these measured values is calculated, and the value obtained by rounding off the second decimal place or less is taken as the radius of curvature of the three-dimensional crimping structure of the present invention.

The radius of curvature is more preferably from 2.0 mm to 20.0 mm. If it is such a range, it means that the loop composed of the sheath yarn has a curl like a spring. Therefore, for the compression of the cross-sectional direction of the fluffy yarn, there is a moderate rebound feeling, and the sheath yarn is in point contact, thereby achieving a very comfortable bulkiness. In addition, it is particularly preferably 3.0 mm to 15.0 mm in consideration of the balance with the high workability of the loops described later and the effect of the present invention. In such a range, there is no problem in long-term durability, and the effects of the present invention are effective when applied to a clothing material to which repeated compression recovery is applied, particularly a sports cloth used in a severe environment.

What is required to exhibit this effect is not a two-dimensional bending that can be imparted by mechanical pressing or the like, but that the single yarn itself has a three-dimensional three-dimensional shape and has a spiral or the like. Take The crimping form in this case is that the tightening phenomenon caused by the entanglement of the yarns is relatively easy to occur, and cannot be introduced into the sheath yarn. This is primarily because the fibers used are generally latent crimped fibers with micron-scale micro-crimping. At this time, the fine spiral structures are engaged with each other, and thus the expansion effect is also promoted.

On the other hand, in order to achieve the suppression of the processing yarns in the present invention, the present inventors focused on the form of the original yarn and made a review. As a result, it has been found that, especially in the case of a millimeter-scale treble-contraction formed in a fluffy yarn having a loop, a phenomenon opposite to the conventional cognition occurs. Since the sheath yarn has a three-dimensional crimp, even if it is a yarn bundle, the fluffy yarns are present in such a manner as to have a volume exclusion, and the twist can be greatly suppressed, and it can be judged that it is composed of a sheath yarn. The multiplication effect of the construction of the terry. That is, the sheath yarn of the fluffy yarn of the present invention has an active space depending on the size of the loop, and according to the definition of the present invention, it has a hemispherical shape with a radius of 2.0 mm or more centering on the fixed point of the loop. The larger activity space. At this time, the single-twisted single-stranded yarns having a size that is overwhelming with respect to the fiber diameter are in point contact with each other and rebound from each other, so that they can be separately present without being twisted. Further, in the filament having the 3-dimensional crimp, in addition to the aforementioned movable space, since the single yarn itself can be elongated like a spring in the fiber axis direction, when the single yarns cross each other, it can be simple by applying vibration. Retreat. This is only a fluffy yarn according to the present invention, and is a structure in which the sheath yarn can form a loop of several times to several tens of times of the conventional loop. Further, the three-dimensional crimp of the sheath yarn will also effectively function in the viewpoint of the bulkiness of the essential characteristics of the present invention. That is, the point contact of the sheath yarns with each other is even one In the processed yarn, the effect of mutual rebound is also generated, and the initial bulkiness is self-evident, and the state in which the fiber is radially opened in the cross section of the processed yarn can be maintained over time. The spring-like behavior of the open-fiber-forming sheath yarn of the present invention is conventionally difficult to achieve with only a straight filament. Further, it is produced by the fact that the sheath yarns are mutually rebounded, and the sheath yarns having the three-dimensional crimping can support each other to greatly suppress the fatigue of the sheath yarn.

The sheath yarn of the present invention forms a loop and has a morphological feature of a three-dimensional crimping structure, and can also be regarded as a reduction in the coefficient of friction. As described above, this contact with other contacts is one of the effects achieved by the fluffy yarn having a specific structure of the present invention in the effect of point contact. According to the review by the inventors of the present invention, in order to have bulkiness and suppress kneading between the processed yarns, the coefficient of static friction between fibers is preferably 0.3 or less. The coefficient of static friction between fibers as referred to herein is measured by a Leder type friction coefficient tester in accordance with JIS L 1015 (2010). Further, in the present invention, if it is not necessary, the processing such as opening of the fiber is not performed, and the processed yarns are arranged in parallel in the cylinder and evaluated. When the fluffy yarn of the present invention is processed into a fiber product, if the fiber is appropriately slidably moved during compression, the hand feel is increased. Therefore, the coefficient of static friction between the fibers is preferably low, preferably 0.2 or less, and particularly preferably 0.1 or less.

The fluffy yarn of the present invention has excellent bulkiness, and the yarn constituting the yarn is preferably moderately resilience. This repulsive property can be regarded as the secondary moment of the cross section of the fiber. In view of the object of the present invention, the single yarn fineness of the synthetic fiber to be formed is preferably 3.0 dtex or more. Further, when the cotton is filled, a deformation such as repeated compression recovery is applied, so that the filaments to be formed are preferably moderately rigid, and the single yarn fineness is more preferably 6.0dtex or more. The term "fineness" as used herein means a value calculated from the required fiber diameter, the number of filaments, and the density, or a simple average value obtained by measuring the weight per unit length of the fiber, and calculating the weight per 10,000 m. value. The single yarn fineness in the present invention is substantially limited to 50.0 dtex.

Further, in the viewpoint of claiming a more excellent feeling by the fluffy 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. If it is such a range, the sheath yarn and the core yarn are close to each other, and can be used without feeling the foreign body sensation at the time of compression. Further, as a range in which the processing can be efficiently performed, the single yarn fineness ratio (sheath/core) is preferably from 0.7 to 1.5, which is more preferable in that the effect of the present invention is more remarkable. Further, in the fluffy yarn of the present invention, a wide variety of fibers may be combined, but the core yarn and the sheath yarn are preferably used in the point of efficient fluid processing and no foreign body sensation at the time of compression. A single yarn with the same fineness and mechanical properties. Specifically, in the present invention, it is preferable to prepare two or more fibers which are produced under the same yarn-making conditions, and use this for the core yarn and the sheath yarn, and it is preferable to use one type (separate) for this purpose. A separate fiber composed of a resin.

From the viewpoint of the reduction of the friction coefficient of the processed yarn or the suppression of the twisting, it is preferable to have a three-dimensional crimping structure in the core yarn in addition to the sheath yarn. This is because when the yarn is in a free state at the point of intersection of the core yarns which substantially fix the sheath yarn, in the core yarn, the staggered point also becomes a gap between the filaments in which the 3-dimensional crimp originating from the core yarn exists. State, such a processing yarn in the case of almost no tension, the loop of the sheath yarn can be slid in a space with limited fiber axis direction, so the activity of the sheath yarn The space is enlarged, and the effect of the suppression or soft hand of the present invention is more remarkable. On the other hand, when the tension is applied to the processed yarn, the sheath yarn is elongated, so that the restraining force at the staggered point is increased, and the unwinding of the loop and the fall of the sheath yarn can be prevented, and the utility model can be effectively utilized on a practical surface. effect. The 3-dimensional crimping of the core yarn can also be confirmed by observing the randomly collected core yarn in accordance with the 3-dimensional crimping evaluation method of the sheath yarn described above.

The fluffy processed yarn of the present invention must have an elastic modulus of 80 cN/dtex or less. The elastic modulus described here is obtained by calculating the stress-strain curve of the processed yarn under the conditions shown in JIS L1013 (1999), and the initial rise portion is linearly approximated, and the slope is obtained from the slope. This operation was evaluated for each of the five samples at each level, and a simple average value of the obtained results was obtained, and the second decimal place was rounded off.

This elastic modulus indicates the rigidity of the processed yarn at the time of elongation deformation, and the higher the value, the harder it is to elongate and deform the processed yarn. On the other hand, when the modulus of elasticity is 80 cN/dtex or less, it means that the processed yarn has a moderate resistance to initial deformation, but can be softly deformed, which means that the process followability is excellent for the purpose of the present invention. For example, when sewing on a jacket, it is of course suitable to appropriately change the characteristics of the sample according to the position. However, the elastic modulus is preferably 65 cN/dtex or less with respect to a part of the elbow or the knee which is particularly active. It is particularly preferable to set the elastic modulus to 55 cN/dtex or less in a portion where the rigidity around the neck or around the waist may cause an uncomfortable feeling of pressure. The lower limit of the substantial modulus 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 ratio as referred to herein can be evaluated by the above tensile tester for evaluating the elastic modulus. Specifically, the processed yarn was stretched by 10% under the conditions of a sample length of 20 cm and a tensile speed of 100%/min using a tensile tester, and then left for 1 minute, and returned to the original sample length at the same speed. This operation was repeated 10 times, and the stress-strain curve at this time was recorded, and the length (S0) at the time of 10% elongation and the length (S1) when the stress became 0 were obtained, and the elongation recovery ratio was determined by the following formula. The same operation was evaluated for each of the five samples at each level, and a simple average value of the obtained results was obtained, and the second decimal place was rounded off.

Elongation recovery rate (%) = (S0-S1) / S0 × 100

[S0: length at 10% elongation, S1: length at which stress becomes 0].

When the fluffy yarn of the present invention is used in a particularly moving portion, the effect can be sufficiently exhibited. When the elongation recovery ratio is 50% or more, it means that the elastic property and the fatigue resistance at the time of repeated elongation recovery are excellent. In the use of the fluffy processed yarn of the present invention, the strain to be repeatedly applied is 10% or less, and the elongation at break of the strain is excellent. If this viewpoint is promoted, the higher the elongation recovery rate as described herein, the closer to the elastic deformation of the rubber, the more the material exhibits excellent elasticity, and the upper limit of the essence of the present invention is 100%. When the fluffy yarn of the present invention is used for general clothing use such as underwear or outerwear or bedding such as quilt or pillow, the elongation recovery ratio is preferably 55% or more. Moreover, in the use of sportswear, which is used in a relatively severe state of use, the elongation recovery ratio is particularly preferably 70% or more.

The fluffy yarn of the present invention preferably has a breaking strength of 0.5 to 10.0 cN/dtex and an elongation of 5 to 700%. The strength stated here is that the processed yarn is obtained under the conditions shown in JIS L1013 (1999). The load-elongation curve is a value obtained by dividing the load value at the time of breaking by the initial fineness, and the elongation is a value obtained by dividing the elongation at the time of breaking by the length of the initial sample. Further, in order to achieve the process passability of the high-order processing step or to withstand the actual user, the breaking strength of the bulky yarn of the present invention is preferably 0.5 cN/dtex or more, and the upper limit which can be carried out is 10.0 cN/dtex. Further, the elongation is preferably 5% or more in consideration of the process passability of the post-processing step, and the upper limit which can be implemented is 700%. The breaking strength and elongation can be adjusted by controlling the conditions of the process according to the purpose of the application. When the fluffy yarn of the present invention is used for general clothing use such as underwear or outerwear or bedding such as quilt or pillow, the breaking strength is preferably set to 0.5 to 4.0 cN/dtex. Further, in sportswear applications and the like which are used in a relatively severe state, the breaking strength is preferably set to 1.0 to 6.0 cN/dtex.

The fluffy yarn of the present invention has elasticity, and the present inventors have intensively reviewed in order to exhibit the elasticity which has not been conventionally obtained, and as a result, it has been found that the processed fluffy processed yarn can exhibit comfortable elasticity by adjusting the characteristics of the core yarn. As a requirement for exhibiting this elasticity, although the core yarn is excellent in elongation recovery, it can be exhibited in principle, but in order to achieve the object of the present invention, it is preferable to form the loop of the core yarn and the sheath yarn to form a loop. It is also an important requirement from the viewpoint of fatigue prevention of fluffy processed yarn. In view of such a viewpoint, the fiber is preferably side-by-side or based on the viewpoint that the fiber opening property of the processed yarn in the processing described later is good and the desired interlacing point is formed. Eccentric core sheath type composite fiber.

The side-by-side type composite fiber as described herein is exemplified in Fig. 4 (4-1), meaning that the fiber is perpendicular to the fiber axis. In the cross section, a fiber having a form in which an A polymer (Fig. 4, 7) and a B polymer (Fig. 4, 8) having different characteristics are bonded. Further, the eccentric core-sheath type composite fiber is exemplified as shown in Fig. 4 (4-2), and means a fiber having the following form in a fiber cross section perpendicular to the fiber axis: at the center of gravity The A polymer (7 of Fig. 4 (4-2)) is disposed on either one of the left and right sides, and the B polymer (8 of Fig. 4 (4-2)) is disposed so as to be covered.

These fibers exhibit crimping in accordance with the difference in shrinkage between the A polymer and the B polymer and the fiber diameter. The elastic ability of the present invention is exhibited in accordance with this curl. The composite fiber exhibits a crimp of about micron order, whereby a good fixing point is formed and the loop is self-standing. In the original yarn stage, it is a flat fiber form, and it is suitable to exhibit a small crimping system after processing, in terms of durability of the fluffy processed yarn and advancement during processing, among the composite fibers, It is preferably a high-viscosity polyethylene terephthalate/low-viscosity polyethylene terephthalate and a polybutylene terephthalate/polyethylene terephthalate side-by-side type and an eccentric core sheath type. Composite fiber.

Further, in the fluffy yarn of the present invention, the principle found by the use of the fluffy yarn can be a fluffy yarn which exhibits high elongation characteristics with low stress and exhibits fatigue resistance, that is, high recovery. At this time, it is preferred to use an elastic yarn as the core yarn. Here, the elastic yarn used for the core yarn may be a fiber containing at least a polytrimethylene terephthalate, a polybutylene terephthalate copolymer, and a thermoplastic polyurethane as a main component. In particular, in the case of wearing in an extended state, thermoplastic urethane is preferred in view of wearing comfort and minimizing the feeling of restraint to obtain a soft touch. The ester is preferably a fiber composed of a polyester elastomer in consideration of workability.

The characteristic that the elongation property under this low stress is excellent can be evaluated by the stress at 10% modulus. That is, the so-called 10% modulus means rigidity when 10% strain is applied to the fiber, meaning that the lower the value, the softer the deformation from the initial stage. Therefore, in the fluffy yarn of the present invention, the 10% modulus is preferably less than 1.5 cN/dtex as an index of soft deformation.

The 10% modulus described here is the stress at which 10% elongation strain is applied, and the stress-strain curve of the fluff yarn is obtained under the conditions shown in JIS L1013 (1999), by applying a strain of 10%. When the load is divided by the fineness of the core yarn, it means that the operation is evaluated for each of the five samples at each level, and the simple average value of the obtained result is obtained, and the second decimal place is rounded off.

The higher the 10% modulus, the more difficult it is to stretch and deform the fluffy yarn. If the stress is less than 1.5 cN/dtex, the fluffy yarn will be softly deformed from the initial stage of deformation. Therefore, when applied to clothes or the like, the feeling of pressure or tightness caused by the wearing feeling can be alleviated, and especially when applied to the elbow or the knee portion where the feeling of tightness is applied, it becomes very comfortable to wear. sense. In view of the elongation under low stress, the stress required for elongation deformation is preferably low, more preferably less than 1.0 cN/dtex, and particularly preferably less than 0.5 cN/dtex. As a 10% modulus in the present invention, the substantial lower limit is 0.1 cN/dtex.

For the purpose of the present invention, for example, when a jacket or the like is designed, it is preferable to change the characteristics of the fluffy yarn in accordance with the position. Learning skills In the case of the technique, the characteristic change is adjusted by increasing the amount of filling, etc., and at this time, it is possible to suppress the uncomfortable compression which is caused by the pressure caused by the elongation of the material around the neck, the cuff, and the periphery of the elbow. Sense, but it is impossible to balance the filling or conformability in order to improve the heat preservation effect. On the other hand, the fluffy yarn of the present invention can be adjusted by appropriately changing the characteristics of the core yarn, and a fluffy yarn having an extensibility suitable for each part can be produced by the manufacturing method described later, and this can be used. Sewing comfortable products.

Moreover, in order to make the elongation under low stress remarkable, it is preferable that the fiber elongation ratio at the time of the weight application is 1.1 or more, and the fiber length recovery ratio is 80 to 100%.

Here, the fiber elongation ratio at the time of load application can be calculated by applying a predetermined load to a sample collected at a specific length to cause elongation, and applying a change in the length of the sample before and after the elongation. That is, a 5 m fluffy yarn was collected at a hank of 1 m/week, and one end of the skein was hung, and the initial load per sample fineness was 0.03 cN/dtex, and the original weight (L0) before the elongation was measured. . Then, the initial load was removed, and the elongation load per sample fineness was 1.5 cN/dtex, and after standing for 1 minute, the sample length (L1) at the time of elongation application was measured, and the fiber elongation ratio at the time of load application was determined by the following formula. The same operation was evaluated for each of the five samples at each level, and a simple average value of the obtained results was obtained, and the second decimal place was rounded off.

Elongation ratio when load is given = L1/L0

[L0: the load gives the original length (cm) before elongation, and L1: the load gives the length (cm) at the time of elongation].

After the measurement of the elongation ratio at the time of the load application, the initial load was applied, and the initial load (L2) after the elongation was applied to the load was measured, and the fiber length recovery rate after the elongation was given by the following formula was determined by the following formula. . The same operation was evaluated for each of the five samples at each level, and a simple average value of the obtained results was obtained, and the second decimal place was rounded off.

The load is given a fiber length recovery rate after elongation (%) = (L1 - L2) / (L1 - L0) × 100

[L0: the load gives the original length (cm) before elongation, L1: the load gives the length (cm) at the time of elongation, and L2: the load gives the length (cm) after elongation].

When the weight-imparting elongation ratio is 1.1 or more, it means that the processed yarn is elongated in a high order, and the fiber length recovery ratio is 80% or more, which means that the shape recovery property after stretching, that is, the fatigue resistance is excellent. That is, the higher the load imparting elongation ratio and the fiber length recovery rate, the more the fluffy yarn is deformed toward the elastic deformation of the rubber, which means that it is suitable for the use of higher-order elongation deformation or repeated elongation recovery. Therefore, for example, when the processed yarn having such a characteristic property is used for the clothing, it is applied to a portion where the elongation recovery is repeatedly applied to the elbow or the knee, and since the pressure due to the tension or the like is not felt, the deformation is almost Respond completely, so there is no such thing as aliasing. Furthermore, when combined with a flexible outer cover, it can also be made into a body-suitable clothing. At this time, high-order heat retention due to adhesion can be ensured, and at the same time, the fabric can be flexibly deformed in accordance with the individual physique, and a wide variety of people can be comfortably worn in one size or sewing style.

Moreover, in order to apply the fluffy yarn of the present invention to general clothing materials such as underwear or outerwear, or pajamas, clothing for the wounded, or pregnant women and For the purpose of minimizing the feeling of restraint and appealing to the soft touch, the weight of the load is preferably 1.5 or more, more preferably 2.0 or more. In addition, when the material having excellent form recovery property is returned to the original form even after being stored in a small volume, the fiber length recovery rate after the load application is more preferably 90% or more, and particularly preferably 95% or more.

In the elongation characteristics of these, the state in which the sheath yarn of the fluffy yarn is completely stretched is the upper limit, and therefore the upper limit of the weight-imparting elongation ratio in the present invention is 20.0.

The fibers used in the present invention are preferably hollow cross-section fibers. As an advantage of the manufacturing method described later, this is a point in which the third-order crimping size of the millimeter-order of the preferred form of the sheath yarn can be relatively freely controlled in a large size to a small size, and the viewpoint of the self-reliance of the terry loop. Medium is more suitable. That is, in the fluffy yarn of the present invention, the terry self-supporting body composed of the sheath yarn is dominant in bulkiness. The self-supporting yarn of the sheath yarn is self-supporting by the rigidity of the sheath yarn starting from the intersection of the core yarns, but the weight of the sheath yarn itself is preferably lightweight when considering the fatigue resistance or the like. Therefore, in particular, the density of the sheath yarn (weight per unit volume) is preferably lower, and it is preferable to use a fiber of a hollow section. In view of the lightweightness of the sheath yarn, a hollow cross-section fiber having a hollow ratio of 20% or more is more preferable. The hollow ratio described here is that after cutting the hollow-section fiber, the cutting surface is imaged by a scanning electron microscope (SEM) at a magnification of 10 or more fibers. Ten randomly selected fibers were taken out from the captured images, and the area of the fibers and the hollow portion was measured using an image processing software to obtain an area ratio. The above values are measured for all 10 images, and the average of 10 images is taken as the hollow of the hollow section fiber of the present invention. rate. Further, in order to easily evaluate the hollow ratio, the fiber side surface was observed with a microscope or the like, and the fiber diameter in terms of a circular cross section was measured from the image. From the fiber diameter, the fineness (converted weight) of the solid fiber is converted, and the ratio of the measured fineness (measured weight) to the ratio is calculated, and the hollow ratio can also be calculated.

In the viewpoint of light weight and heat retention of the object of the present invention, the hollow ratio described herein is preferably such that the bulky yarn has an air layer, and particularly preferably has a hollow ratio of 30% or more. When it is such a range, when the processed yarn is bundled and held, it means that the airiness layer which is more excellent in lightness can be actually perceived, and the air layer having a lower thermal conductivity is provided, so that the heat retaining property is also excellent. The upper limit of the substantial hollow ratio in the present invention is 50%.

The sheath yarn of the fluffy yarn of the present invention preferably has a density of less than 1.00 g/cm ³ . The density of the sheath yarn as referred to herein is the weight per unit volume of the sheath yarn, and can be measured using a density gradient tube in accordance with the method of JIS L 1013:2010. When the density of the sheath yarn is in such a range, when a cotton pad as a clothing or bedding is used, it becomes a lightweight product, and the comfort during use becomes high. The density of the sheath yarn is more preferably 0.95 g/cm ³ or less, and particularly preferably 0.90 g/cm ³ from the viewpoint of improving the lightweight of the fluffy yarn.

Further, in order to impart lightweightness and mechanical properties, it is a fluffy yarn which has no rebound feeling in the past, and the fiber used in the sheath yarn is preferably a sea-island composite fiber having a hollow cross section. The island-in-a-sea composite fiber as described herein is a composite fiber having a cross-sectional structure in which an island composed of a certain polymer is dispersed in a sea component composed of another polymer. As an example of the sea-island composite fiber having the hollow cross section, an example can be cited. As shown in Fig. 5, a hollow portion (9) is provided in the center of the fiber cross section, and a donut-type sea-island composite fiber in which the island (10) is dispersed in the sea component (11).

As described above, by containing air in the hollow portion at the center of the fiber cross section, not only lightweightness but also an air layer contained in the hollow portion can be used for the heat insulating effect, thereby obtaining heat retaining property. In addition, by the island structure around the hollow portion, the impact of the compression or the bending of the fluffy yarn is dispersed by the island component dispersed in the sea component, and the sheath yarn is reinforced while maintaining the flexibility of the sheath yarn. The fiber having a high hollow ratio is greatly improved as a subject fatigue, and becomes a fluffy yarn having a rebounding property.

The combination of the island component of the sea-island composite fiber and the polymer used in the sea component can be appropriately selected from the above-mentioned polymer group, but the weight of the fluffy yarn is promoted and it is sufficiently durable to be used as a fiber product. From the viewpoint of physical properties, the island component is preferably a polyolefin, and the sea component is preferably a polyester. Due to the low density of polyolefins, the island-in-a-sea composite fibers are lightweight due to their use in island components. In addition, since the sea component is a polyester, physical properties such as the elongation of the sea-island composite fiber can be applied to the fiber product, and the sea component which is a matrix of the sea-island composite fiber has crystallinity, and deterioration or fatigue during processing or use is caused. Become a person with high patience. In this case, when the sea-island composite fiber is used as the fiber product, the island/sea composite ratio is preferably from 50/50 to 10/90 from the viewpoint of imparting sufficient characteristics. Furthermore, from the viewpoint of increasing the ratio of the low-density polyolefin of the island component and increasing the lightness of the sea-island composite fiber, the island/sea composite ratio is preferably 50/50 to 20/80, and particularly preferably 50/50. ~30/70.

The fluffy yarn of the present invention can be used as a fiber take-up package or tow, cut fiber, cotton, fiber ball, rope, fluff, weave, no A variety of fiber structures, such as woven fabrics, are used in a wide variety of fiber products. The fiber products mentioned here can be used for general clothing, interior decoration products for sports clothes, clothing materials, carpets, sofas, curtains, etc., vehicle interiors, car seats, cosmetics, cosmetic masks, rags, health products. The use of the environment, the use of filters, hazardous materials removal products, etc. In particular, the fluffy yarn of the present invention is suitably used as a quilting because of its bulkiness and the effect of suppressing twisting and the like. At this time, after filling the outer cover, it may be a method of forming several to several tens of yarn bundles or a sheet of non-woven fabric or the like. In particular, when the sheet is formed, the filling of the outer cover is simple, and it is easy to adjust the filling amount according to the use. Therefore, it becomes a thin and lightweight ‧ insulating material, and there is no concern that the outer cover is dropped, and it is not necessary to apply unnecessary sewing, and the shape of the fiber product is not limited, and complicated design is also possible.

An example of the method for producing the fluff yarn of the present invention will be described in detail below.

The core yarn and the sheath yarn used in the present invention may be a synthetic fiber obtained by fibrillating a thermoplastic polymer by a melt spinning method.

The spinning temperature at the time of spinning the synthetic fiber used in the present invention is the temperature at which the polymer used exhibits fluidity. The temperature at which the fluidity is apparent may vary depending on the molecular weight, but may be set to a melting point of +60 ° C or less for the melting point of the polymer. If it is below this, it is preferable because the polymer does not thermally decompose in the spinning head or the spinning unit, and the molecular weight is suppressed from being lowered. Further, the discharge amount is in a range in which the discharge can be stably performed, and it is 0.1 g/min/hole to 20.0 g/min/hole per discharge hole. In this case, it is preferable to consider the discharge of the stability which ensures the discharge. Pressure loss of the hole. The pressure loss as described herein is intended to be 0.1 MPa to 40 MPa, and the discharge amount is determined from the range based on the relationship between the melt viscosity of the polymer, the discharge pore size, and the discharge hole length.

The molten polymer thus discharged is cooled and solidified, and is supplied with an oil agent, which is drawn by a predetermined roll at a peripheral speed to become a synthetic fiber. Here, the traction speed can be determined according to the discharge amount and the fiber diameter of the object, but it is preferably in the range of 100 to 7000 m/min for stable production. From the viewpoint of high alignment and improvement of mechanical properties, the synthetic fiber can be stretched after being wound up, and can be continuously stretched without being taken up. As such an extension condition, for example, in an extension machine including a pair of rolls, the peripheral speed of the first roll set to a temperature lower than the glass transition temperature or higher and the second roll corresponding to the crystallization temperature may be used. In the fiber axis direction, fibers which are generally composed of a polymer representing a synthetic fiber which can be melt-spun are not excessively stretched, and are taken up by heat setting. In the case of a polymer which does not exhibit glass transition, the dynamic viscoelasticity measurement (tan δ) of the conjugate fiber is carried out, and the temperature above the peak temperature of the high temperature side of the obtained tan δ is determined as the preliminary heating temperature. Here, from the viewpoint of improving the stretching ratio and improving the mechanical properties, it is also a suitable means to perform the stretching step in multiple stages.

The cross-sectional shape of the synthetic fiber of the present invention is not particularly limited, and the shape of the discharge hole in the spinning nozzle can be changed to a general circular cross section, a triangular cross section, a Y shape, an octagonal shape, a flat type, or the like. Or amorphous or hollow type and other amorphous. Further, it is not necessary to be a single polymer, and it may be a composite fiber composed of two or more types of polymers. However, the 3rd dimension of the sheath yarn that exhibits the important requirements of the present invention In the above, in the above, it is suitable to use a hollow cross section or a side-by-side type composite fiber in which two types of polymers are bonded. That is, among these fibers, it is characterized in that the three-dimensional crimping is exhibited by the difference in the structural direction in the cross-sectional direction by the heat treatment after the yarn making and the yarn feeding. Therefore, in the fluid processing to be described later, it is a so-called linear fiber, but after the loop forming step of the sheath yarn, the heat treatment is performed to exhibit a three-dimensional crimp. When the fibers are straight in the fluffy processing, the yarns are easily moved forward without any yarn clogging or the like in the nozzle or the like. Further, in the formation of the loop of the present invention, the back transition of the core yarn and the sheath yarn is efficiently performed, and the loop is formed in a very homogeneous manner in the fiber axis direction of the processed yarn. For the crystallization temperature of the polymer used for processing the yarn, the processed yarn having the loop formed on the outer layer is heat-treated, and the sheath yarn exhibits a three-dimensional crimp to become the fluffy yarn of the present invention.

The three-dimensional crimping of the sheath yarn exhibits good bulkiness in both the circumferential direction and the cross-sectional direction of the processed yarn, and is suitably controlled in accordance with the required characteristics. From the viewpoint of controlling the crimping display 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 section fiber, there is an air layer having a low thermal conductivity at the center of the fiber. Therefore, for example, after spouting from a spinning nozzle capable of forming a hollow cross section, one side is forcibly cooled by excessive cooling air or the like, or one side is excessively heat-treated by a heating roller or the like during stretching, and the fiber is cross-sectionally oriented. The resulting construction is poor. In the case of the hollow section fiber, in addition to the yarn making by the separate spinning machine, it is also possible to relatively freely control the size of the 3-dimensional crimp in the large size to the small size by the aforementioned operation. Therefore, as appropriate for the present invention, the volume is controlled by the aforementioned operations. In the viewpoint of shrinkage, a hollow cross-section fiber having a hollow ratio of 20% or more is more preferable, and a hollow cross-section fiber having a hollow ratio of 30% or more is particularly preferable.

In the first step of the fluffy yarn of the present invention, a predetermined amount of the core yarn (20 of Fig. 6) and the sheath yarn (21 of Fig. 6) are supplied by a supply roller (19 of Fig. 6) having a nip roll or the like. The core yarn and the sheath yarn are attracted by a suction nozzle (12 of Fig. 6) capable of jetting compressed air.

In the suction nozzle (12 of Fig. 6), the flow rate of the compressed air ejected from the nozzle is such that the sliver inserted from the supply roller has the minimum required tension, and is not between the supply roller-nozzle and the nozzle. It causes a pendulum, etc., and can spray a flow that is stable. The flow rate of the compressed air is the optimum amount depending on the aperture of the suction nozzle to be used. However, as a range in which the yarn tension can be smoothly formed, the airflow speed in the nozzle is 100 m/s. the above. The target of the upper limit of the air flow rate is 700 m/s or less. If it is in such a range, the yarn is not swung by the excessively injected compressed air, and the yarn can be stably moved in the nozzle.

Further, from the viewpoint of preventing disturbance and fiber opening in the nozzle, it is preferable that the injection angle of the compressed air (22 of Fig. 7) is a propelling jet that is injected at less than 60° with respect to the traveling sliver. It is preferable to form the loop formation of the sheath yarn in a high productivity and homogeneously. Of course, it is not impossible to manufacture the fluffy yarn of the present invention by processing a vertical jet of 90° with respect to the traveling sliver, but the spinning of the sliver is carried out by suppressing the jet of the jet from the vertical direction. It is preferable to advance the jet flow from the viewpoint of the twisting of the single yarns in the narrow space in the nozzle. The processing of this propelling jet can also be suppressed in vertical The arched small loops which are easily formed in the case of the jet flow are formed in a short cycle.

In the formation of the loop formed by the sheath yarn required for the fluffy yarn of the present invention, it is preferable that no disturbance or fiber opening is imparted in the suction nozzle. In the viewpoint of not advancing the multifilament yarn composed of several to several tens of yarns in the nozzle, the injection angle of the compressed air is preferably 45 or less with respect to the traveling yarn. Further, in order to form a loop other than the nozzle to be described later, the stability and the propulsive force of the jet flow immediately after the nozzle are preferably high. From this viewpoint, the spray angle is particularly preferably 20 or less with respect to the traveling sliver. .

Next, the step of rotating the sliver sucked through the suction nozzle outside the nozzle to form the loop of the sheath yarn is the second step of the present invention.

The yarn which is guided to the suction nozzle is in the case of one feed and two feeds. However, in the manufacture of the fluff yarn of the present invention, it is preferable to perform the two feed processing. The term "feeding" as used herein refers to a method in which a supply speed (amount) is given to a supply roller by a feed roller or the like in advance, and a method of supplying the nozzle to the nozzle is formed by utilizing a swirling force of a gas flow to be described later. The yarn (sheath) on the excess supply side forms a fluffy structure of the loop on the outer layer. When using this 2 feed, it is not impossible to manufacture a processed yarn having a loop by an entanglement processing nozzle or a Taslan processing nozzle which imparts the effect of the traveling yarn slack, the opening and the entanglement in the nozzle. . However, in the yarn processed by the processing nozzle, in addition to the formation of the loop in a short period, the size thereof also becomes small. Therefore, in order to manufacture a fluffy yarn which satisfies the object of the present invention, it is extremely difficult to control the parameters which are present in a large amount. Multi-spinning In the case of the possibility that the fluffiness of the processed yarn differs in each spindle, it is also preferable to use a method of controlling the airflow outside the nozzle to be described later from the viewpoint of the stability of the quality. In this regard, it is conceivable not to give disturbance in the nozzle, to open the fiber, to rotate the two yarns supplied at a position away from the nozzle, and to form a loop, and to concentrate on the control of the airflow ejected from the nozzle. As a result of the review, as a result, when the ratio of the airflow speed to the yarn speed (the airflow speed/yarn speed) was 100 to 3,000, the specific phenomenon of the yarn edge rotation of the sheath yarn was found.

The airflow speed as referred to herein is the speed of the airflow ejected along the traveling sliver downstream of the suction nozzle, and can be controlled by the discharge path of the nozzle and the flow rate of the compressed air. Further, the yarn speed can be controlled by the peripheral speed of the roller for drawing the processed yarn after the fluid processing nozzle. The rotational force of the traveling sliver is increased or decreased depending on the speed ratio of the airflow to the yarn. When the staggered point of the desired fluffy yarn is made strong, the speed ratio is closer to 3000, and the slower interlacing point is reversed. The better the 100 is. This speed ratio can be changed, for example, by changing the flow rate of the compressed air intermittently or by changing the speed of the pulling roller. On the other hand, when the fluff yarn of the present invention is used for the purpose of repeatedly imparting compression recovery deformation such as cotton or the like, it is preferred to set the air flow speed/yarn speed to 200 to 2,000. In particular, when producing a processed yarn for a clothing such as a jacket that is deformed at a high frequency, it is particularly preferable to set the air flow speed/yarn speed to 400 to 1500 from the viewpoint of imparting appropriate restraint and flexibility.

The turning point (13 of Fig. 6) which becomes the base point for exhibiting this turning force is started by detaching the traveling sliver from the accompanying airflow. Specifically, the yarn path can be changed by a rod guide or the like, and the traveling yarn is pulled at a predetermined speed by the pulling roller (15 of FIG. 6) in the advancing direction of the traveling sliver, and the sheath yarn is in the core yarn. Rotate around it to form a loop. From the viewpoint of the loosening due to the vibration of the sheath yarn by the diffusion of the airflow caused by the rotation and the airflow ejected from the nozzle, the turning point of the traveling sliver is preferably at a position away from the nozzle discharge port. . However, the distance between the nozzle-turn point suitable for manufacturing the fluffy yarn of the present invention varies depending on the speed of the jetted air stream, and preferably the turning point (13 of Fig. 6) exists in the jet airflow of 1.0 × 10 ^{-5 .} Seconds to between 1.0 × 10 ^-3 seconds. In order to balance the diffusion of the gas stream and form the interlacing point of the core yarn and the sheath yarn in a moderate cycle, the distance between the nozzle and the turning point is preferably such that the jetting airflow travels from 2.0×10 ^-5 seconds to 5.0×10 ^-4 seconds. between.

By adjusting this turning point, the period of the staggered point of the fluffy yarn of the present invention can also be controlled. The staggered point has the function of supporting the loops composed of the sheath yarns which are characteristic of the present invention, and is preferably present in a certain period of time. From this point of view, it is preferable to adjust the turning point so that the interlacing point of the core yarn and the sheath yarn in the fluffy yarn is from 1/mm to 30/mm. If it is such a range, it is preferable to have a loop having a moderate interval even after the 3-dimensional crimping of the sheath yarn is exhibited. If this viewpoint is promoted, it is more preferable to adjust the turning point so that the staggered point becomes 5/mm to 15/mm.

The processed yarn (14 of Fig. 6) formed with a loop composed of a sheath yarn is preferably subjected to heat treatment after being wound up or after fluffing, in order to exhibit a form-fixation or a 3-dimensional crimp. The processing step of performing the heat treatment after the loop forming step is exemplified in FIG.

This heat treatment (16 of Fig. 6) is a process of heating the processed yarn by a heater or the like, and the processing temperature is targeted at a crystallization temperature of ± 30 ° C of the polymer to be used. In the case of this temperature range treatment, since the treatment temperature is far from the melting point of the polymer, there is no foreign matter sensation in the place where the sheath yarn or the core yarn is not welded and hardened, and the good feel of the inventive fluffy yarn is not impaired. The heater used in this heat treatment step may be a general contact or non-contact type heater, but it is preferable to use a non-contact type heater from the viewpoint of bulkiness before heat treatment or suppression of deterioration of the sheath yarn. The non-contact heater described here is an air-heated heater equivalent to a trough heater or a tube heater, a steam heater heated by high temperature steam, a halogen heater heated by radiation, or carbon. Heater, microwave heating, etc.

From the viewpoint of the heating efficiency as referred to herein, a heater that uses radiant heating is preferred. The heating time is, for example, fixed by fixing the fiber structure of the fiber constituting the processed yarn, fixing the shape of the processed yarn, and completing the crimping of the sheath yarn, for example, and is preferably adjusted according to the required characteristics. Handling temperature and time. The processed yarn which is completed by the heat treatment step can be conditioned by a conveying roller (17 of Fig. 6), and wound up by a winder or the like having a tension control function (Fig. 6-18). The winding shape is not particularly limited, and may be a so-called flat drum winding or bobbin winding. Further, in consideration of the processing of the final product, a plurality of yam yarns are also preliminarily formed into a tow or a direct slab.

The fluffy yarn of the present invention preferably has a uniform adhesion of the polyoxo-based oil before and after the heat treatment step. The polyfluorene attached here can be appropriately crosslinked by heat treatment or the like, on the sheath yarn and the core yarn. A film of polyoxyn oxide is formed. The polyoxo-based oil agent referred to herein is equivalent to dimethyl polyoxyalkylene, hydrogen methyl polyoxyalkylene, amine polyoxyalkylene, epoxy polyoxyalkylene, etc., which may be used alone or in combination. Wait for use. Further, from the viewpoint of uniformly forming a film on the fluffy yarn, a dispersing agent, a viscosity adjusting agent, a crosslinking accelerator, an antioxidant, a flame retardant, and an anti-corrosion agent may be contained within a range not to impair the adhesion of the polyfluorene oxide. Electrostatic agent. The polyoxo-based oil agent can be used as it is, or can be used as an aqueous emulsion. However, it is preferably used as an aqueous emulsion from the viewpoint of uniform adhesion of the oil agent. The polyoxygenated oil agent is preferably prepared by using an oil agent guide, an oiling roller or a spray, and is expressed by a mass ratio, and is attached to the fluff yarn by 0.1 to 5.0% by weight. It is then preferably dried at any temperature and time to effect a crosslinking reaction. The polyoxo-based oil agent can be divided into a plurality of attachments, and it is also preferable to laminate a strong polyfluorene oxide film by separately adhering the same kind of polyfluorene oxide or different kinds of polyfluorene oxide. By the above treatment, a film of polyfluorene is formed on the fluffy yarn, and the slidability and feel of the fluffy yarn can be increased, and the effect of the present invention can be made more conspicuous.

Example

Hereinafter, the fluff yarn of the present invention will be specifically described by way of examples.

For the examples and comparative examples, the following evaluations were carried out.

A. fineness

The weight of 100 m of the fiber was measured, and the fineness was calculated at 100 times. This is repeated 10 times, and the value obtained by rounding off the second decimal place of the simple average value is taken as the fineness of the fiber. The so-called single yarn fineness is calculated by dividing the fineness by the number of filaments constituting the fiber. At this time, the value of the second decimal place is rounded off as a single yarn fineness.

B. Mechanical properties of the fiber (strength, modulus of elasticity, 10% modulus)

For the fiber, a tensile-test curve was 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 load at the time of the fracture was read, and the load was calculated by dividing the load by the initial fineness. Further, the elastic modulus is obtained by linearly approximating the initial rise of the stress-strain curve from the slope. The 10% modulus is calculated by reading the load of 10% strain and dividing by the initial fineness. Any value is evaluated for each of the five samples at each level, and the simple average value of the obtained results is obtained. The intensity and the elastic modulus are the values obtained by rounding off the first decimal place, and the 10% modulus system will be The second decimal place is rounded off.

C. Tensile elongation rate of fiber at 10% elongation

For the fiber, a Tensilon UCT-100 type tensile tester manufactured by ORIENTEC Co., Ltd. was used, and the sample was stretched by 10% under the conditions of a sample length of 20 cm and a tensile speed of 100%/min, and then allowed to stand for 1 minute, and returned to the original speed at the same speed. The position of the sample length. This operation was repeated 10 times, and the stress-strain curve at this time was recorded, and the length (S0) at the time of 10% elongation and the length (S1) when the stress became 0 were obtained, and the elongation recovery ratio was determined by the following formula. The same operation was evaluated for each of the five samples at each level, and a simple average value of the obtained results was obtained, and the second decimal place was rounded off.

Elongation recovery rate (%) = (S0-S1) / S0 × 100

[S0: length at 10% elongation, S1: length at which stress becomes 0].

D. Fiber elongation ratio and fiber length recovery rate when load is applied

A fiber of 5 m was collected at a hank of 1 m/week, and one end of the skein was hung, and the initial load of 0.03 cN/dtex was hung on the skein, and the original length (L0) was measured. Then, the initial load was removed, the load was 1.5 cN/dtex, and the sample length was allowed to stand for 1 minute. Then, the sample length (L1) at the time of elongation was measured, and the fiber elongation ratio at the time of load application was determined by the following formula. The same operation was evaluated for each of the five samples at each level, and the simple average value of the obtained results was obtained, and the value obtained by rounding off the second decimal place was used as the load to give the elongation ratio.

Load imparting elongation ratio = L1/L0

[L0: the load gives the original length (cm) before elongation, and L1: the load gives the length (cm) at the time of elongation].

Further, after the measurement of the elongation ratio by the load, the elongation load was removed, and 0.03 cN/dtex was suspended from the skein in the same manner as the initial load, and the sample length (L2) after the load was applied was determined by the following formula. The fiber length recovery rate was also evaluated. At this time, the same operation was evaluated for each of the five samples, and a simple average value of the obtained results was obtained, and the value obtained by rounding off the first decimal place was taken as the fiber length recovery rate.

The load is given a fiber length recovery rate after elongation (%) = (L1 - L2) / (L1 - L0) × 100

[L0: the load gives the original length (cm) before elongation, L1: the load gives the length (cm) at the time of elongation, and L2: the load gives the length (cm) after elongation].

E. Density

Density gradient tubes were used to determine the density of the fibers according to JIS L 1013:2010. After the sample reaches the equilibrium position in the liquid and is stationary, read the sedimentation depth of the sample from the scale of the density gradient tube to 1 mm. So far, compare the numerical value with the correction curve to obtain the density. These two times were performed at each level, and 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.

F. Loop evaluation (size, number, break)

A load of 0.01 cN/dtex was applied to the processed yarn in such a manner that no slack occurred, and the yarn was hung on a pair of yarn guides with a fixed length as illustrated in FIG. The side of the processed yarn of the yarn-hanging yarn was photographed by the KEYENCE company's microscope VHX-2000 with the magnification of the entire loop. For the 10 randomly selected from this image, use the image processing software (WINROOF) to evaluate the distance from the yarn surface at the front end of the loop (Fig. 2). This operation is performed for a total of 10 images, and the total of 100 points to the first decimal place is measured in millimeters. The average value of these numerical values is calculated, and the value obtained by rounding off the second decimal place or less is taken as the loop size (protrusion) in the present invention.

For the same 10 images, the front end of the loop and the break point of the sheath yarn per unit distance were counted, and the number of the loops per 1 mm and the break point were evaluated. The same operation was performed on 10 images, and the value after the decimal point of the average value was rounded off was evaluated as the number of loops. Further, for the breaking point of the loop, the broken points of the counted loops are averaged, and the second decimal place is rounded off to obtain the break point of the loop. Here, the sample having a breaking point of less than 0.2/mm is regarded as a continuous existence of the loop of the present invention, and it is evaluated as having no fracture (evaluation: A), and those having a value of 0.2/mm or more are evaluated as having a fracture (evaluation: C) ).

G. Evaluation of crimped shape (3-dimensional crimp, radius of curvature)

Each of the 10 yarns which were arbitrarily selected from the processed yarns was collected from 10 or more single yarns, and the magnification of the crimped form was observed with a KEYENCE company's microscope VHX-2000, and the respective single yarns were observed. In this image, when the observed single yarn has a shape that is spiraled, it is determined to have a three-dimensional crimping structure (evaluation: A), and when it is in the form of a straight line, it is determined that there is no crimping structure (evaluation: C). Further, from the same image, the image processing software (WINROOF) was used to evaluate the radius of the true circle which was inscribed at most two places in the bending of the crimped fiber (Fig. 3). A single yarn of a total of 100 randomly drawn as described above is measured in millimeters, and the value of the second decimal place of the simple average is rounded up to the third decimal place as the third-dimensional crimping structure of the present invention. The radius of curvature.

H. Static friction coefficient between fibers

It was measured by the method of JIS L 1015 (2010) by a Leder type friction coefficient tester. Further, the evaluation of the coefficient of static friction between fibers herein was evaluated by arranging the processed yarns in parallel on the cylinder.

I. Unwinding (inhibition effect of tightening phenomenon)

The drum wound with the processed yarn of 500 m or more was placed on the creel, and unrolled at a speed of 30 m/min in the cross-sectional direction of the drum for 5 minutes, and the yarn jump and jam due to the shrinkage phenomenon were visually confirmed. The evaluation was carried out in the following four grades.

S: I can't see the beating of the yarn, and it can be unwound well.

A: I saw the beating of the yarn slightly, and I can unwind without any problem.

B: I saw the jump of the yarn and a slight stuck, but it can be unwound.

C: The yarn jumps and gets stuck, and it cannot be unwound.

J. Touch

A drum wound with a processing yarn of 500 m or more was placed on a creel, and a cloth inspection machine was used in the cross-sectional direction of the drum to unwind the yarn into a roll form to form a yarn of 10 m. One of the twisted yarns was fixed, and a sample for feeling evaluation was prepared. The feel at the time of holding the sample was evaluated in the following four grades.

S: Excellent in bulkiness and softness, and does not feel excellent in foreign body sensation.

A: A good hand with fluffiness and softness.

B: Good hand feeling that is bulky and does not feel foreign body sensation.

C: There is no looseness and a bad feeling of foreign body sensation.

K. fluffy evaluation

20 g of the processed yarn was filled in a cylindrical container having an inner diameter of 28.8 cm and a height of 50.0 cm, and the space occupied by the processed yarn when a load of 0.15 g/cm ² was applied from the upper side in the vertical direction was measured for the filled processed yarn. The height H (cm) is calculated by the following formula (inch ³ / 20 g), and the integer value rounded off the first decimal place is taken as the bulkiness of the processed yarn.

Fluffiness (inch ^{3 /} 20g) = (14.4 ² π/2.54 ³ ) × H

Further, the height of each of the processed yarns was measured by reading the height in units of mm from a scale which was aligned at 0 on the bottom surface of the cylindrical container.

[Example 1]

Prepare high-viscosity polyethylene terephthalate (PET1: IV=0.8dl/g) as A polymer to prepare low-viscosity polyethylene terephthalate The diester (PET2: IV = 0.5 dl/g) is used as a B polymer, and after being melted at 295 ° C, it is metered into a spinning assembly having a composite nozzle to be exemplified in Fig. 4 (4-1). It was discharged by a side-by-side composite cross section composed of A polymer and B polymer (composite ratio: A polymer / B polymer = 50 / 50). After the spun yarn was spun at a flow rate of 20 m/min and cooled and solidified at a flow rate of 20 m/min, the undrawn yarn was taken up at a spinning speed of 1500 m/min after the spinning oil was supplied. The undrawn yarn which was taken up was used as a core yarn by a composite fiber (single yarn fineness: 7.0 dtex) which was stretched 3.0 times at an elongation speed of 800 m/min between rolls heated to 90 ° C and 140 ° C.

Next, after melting polyethylene terephthalate (PET3: IV = 0.6 dl/g) at 290 ° C, it was metered into the spinning assembly from three slits (width 0.1) as illustrated in FIG. Mm, 23 of Fig. 8) is arranged in a concentric circular hollow cross-section discharge hole, and is discharged so as to have a hollow ratio of 30%. The spun yarn was sprayed at a flow rate of 30 m/min from a single side to a cooling air of 20 ° C to be cooled and solidified, and then the spinning oil was supplied, and the undrawn yarn was taken up at a spinning speed of 1500 m/min. Next, the wound undrawn yarn was used as a sheath yarn as a hollow fiber (single yarn fineness 6.5 dtex) which was extended by 3.0 times at an elongation speed of 800 m/min between rolls heated to 90 ° C and 140 ° C.

For the core yarn and the sheath yarn, the core yarn and the sheath yarn were supplied to the suction nozzle at a supply roller speed of 50 m/min and 1000 m/min in the procedure exemplified in Fig. 6 . The compressed air is ejected in the suction nozzle so that the air flow speed becomes 400 m/s with respect to the traveling sliver, so that the core yarn and the sheath yarn are ejected from the nozzle together with the accompanying air flow without being entangled. The sliver jetted from the nozzle traveled for 1.0 × 10 ^-4 seconds together with the air flow, and the yarn guide was changed by a ceramic guide, and the processed yarn of the loop formed of the sheath yarn was drawn by a roller of 50 m/min. The processed yarn was continuously guided to the tube heater by a roller, and heat-treated at 150 ° C for 10 seconds to shape the fluffy yarn while the core yarn and the sheath yarn were crimped. The fluffy yarn was wound around the drum at 52 m/min by a tension-controlled coiler placed behind the tube heater.

In the first embodiment, the loops composed of the sheath yarns protruded from the surface of the yarn by an average of 38.0 mm, and the fluff yarns in which the loops were formed in a number of 22/mm were obtained. This outstanding terry system is excellent in uniformity in cycle size and cycle. Further, the sheath yarn of the processed yarn has a millimeter-scale three-dimensional crimping structure having a radius of curvature of 5.7 mm, and a broken portion is not seen in the loop of the sheath yarn, and a continuous loop is formed. (Broken place: 0.0) Next, the polyfluorene-based oil agent was uniformly sprayed on the processed yarn by spraying, and the final amount of the polyoxymethane adhered was 1 wt% with respect to the fluffy yarn, and the polyfluorene-based system was used. The oil agent contained polyoxyalkylene at a concentration of 8 wt%, and heat-treated at 165 ° C for 20 minutes to collect the fluff yarn of the present invention.

In the fluffy yarn, the sheath yarn forming the continuous loop has a three-dimensional crimping structure, the coefficient of static friction between the fibers is 0.1, and the unwinding property of the processed yarn is not problematic, and jamming does not occur, and the smooth roll can be smoothly performed. Take the roller to unwind (unwinding: S). Further, the elastic modulus of rigidity was 73 cN/dtex, and the elongation recovery rate was 83%, which was comfortable (hand feeling: S). The results are shown in Table 1.

[Embodiment 2]

Except for the combination of the polymers used in the core yarn of Example 1, the PET1/PET2 side-by-side composite fiber having a single yarn fineness of 3.0 dtex was adjusted as the core yarn by adjusting the discharge amount, and all were carried out in accordance with Example 1.

In the second embodiment, by reducing the single yarn fineness of the core yarn, the number of the loops is increased somewhat, and compared with the first embodiment which is easily deformed at the time of elongation deformation, it is a soft hand. The results are shown in Table 1.

[Examples 3, 4]

In addition to changing the A polymer to polybutylene terephthalate (PBT: IV = 1.2 dl/g), the spinning temperature was set to 290 ° C, and the yarn was produced using the composite nozzle used in Example 1. The collected PBT/PET2 side-by-side composite fiber was used as the core yarn, and all were carried out in accordance with Example 1 (Example 3). Further, in the same polymer composition as in Example 3, a PBT/PET2 side-by-side composite fiber having a single yarn fineness of 3.0 dtex was adjusted as a core yarn by adjusting the discharge amount, and a fluffy yarn was collected (Example 4).

In Example 3 and Example 4, the core yarn exhibited a relatively fine crimp in the original yarn stage, and the number of loops was reduced in the fluffy processed yarn. Further, in comparison with Example 1, the modulus of elasticity was low, and it was very soft and was deformed by elongation with low stress. Further, the elongation recovery ratio is greatly increased, and it is not fatigued even when deformed at a relatively high level, and is suitable for use in a material having a large moving range. The results are shown in Table 1.

[Comparative Example 1]

The polyethylene terephthalate (PET3: IV = 0.6 dl/g) used in the sheath yarn of Example 1 was melted at 290 ° C, and then metered into the spinning unit, as illustrated in Fig. 8 . Three slits (width: 0.1 mm, 23 of FIG. 8) were arranged in a concentric circular hollow cross-section discharge hole, and were discharged so as to have a hollow ratio of 30%. A cooling air of 20 ° C was added (100 m/min) to the first embodiment, and after the yarn was sprayed from one side to be cooled and solidified, the spinning oil was given, and the spinning speed was taken at a spinning speed of 1500 m/min. yarn. Next, the hollow fiber (single yarn fineness 6.5 dtex) of the undrawn yarn which was taken up by stretching at a stretching speed of 800 m/min between the rolls heated to 90 ° C and 140 ° C was used as a core yarn and a sheath. All of the yarns were carried out in accordance with Example 1.

In Comparative Example 1, the morphological characteristics of Example 1 were substantially the same, but the size of the loop was small and the number of loops was lowered. Although it is excellent in unwinding property and hand feeling, the elastic modulus is high and the elongation recovery rate is lowered. The results are shown in Table 2.

[Comparative Example 2]

All of them were carried out in accordance with Comparative Example 1, except that the nozzle whose injection angle of compressed air was changed to 90° and the turning point without the ceramic guide were provided. However, in Comparative Example 2, when the compressed air flow rate was the same as in Comparative Example 1, the twist of the core yarn and the sheath yarn was excessive, and nozzle clogging occurred, and the air flow rate was reduced to 200 m/s which was half of Comparative Example 1. The processing yarn is collected and evaluated for characteristics.

In the processed yarn of Comparative Example 2, the loop size of the sheath yarn was smaller than that of Example 1 or Comparative Example 1 at the time point before the heat treatment. Since it is formed in a very short cycle, when the sheath yarn is crimped by heat treatment, although the loop is formed in the yarn, the bulkiness is lacking. When the details of the loops composed of the sheath yarns were confirmed, unevenness was observed in the loop size, and the break points which were not observed before the heat treatment were observed relatively (there were fractures: 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 by a pair of rubber sheets to carry out the untwisting treatment. Although the bulkiness of the appearance was increased, the rupture system of the lower loop was increased as compared with Comparative Example 2, and the sheath yarns were promoted to each other, and the foreign body sensation was felt during compression. Further, as compared with Comparative Example 2, the yarn was stuck more at the time of unwinding, and the unwinding property was also lowered. The results are shown in Table 2.

[Example 5]

In addition to changing the A polymer to polytrimethylene terephthalate (3GT: IV = 1.2 dl/g), the spinning temperature was set to 280 ° C, and the yarn was produced using the composite nozzle used in Example 1. The collected 3GT/PET2 side-by-side composite fiber was used as the core yarn, and all were carried out in accordance with Example 2 (single yarn fineness: 3.0 dtex).

In the fifth embodiment, the number of loops is lower than that of the first embodiment, and the curl of the core yarn is increased during processing, and the elongation recovery ratio is lowered, but the elasticity is sufficiently ensured, and the elastic modulus is lowered to have a soft hand. The results are shown in Table 3.

[Examples 6, 7]

All of them were carried out in accordance with Example 1 except that the supply speed was changed to 50 m/min of core yarn, 500 m/min of sheath yarn (Example 6), core yarn 20 m/min, and sheath yarn 1000 m/min (Example 7).

In the sixth embodiment in which the supply speed ratio was decreased, the loop size was somewhat smaller than that of the first embodiment, but the elasticity of the feature of the present invention was the same, and the hand feeling was good.

In the seventh embodiment in which the supply speed ratio was increased, although the size of the loop was 60.1 mm, which was larger than that of the first embodiment, the slack of the loop was hardly obtained. Although the hand has a softness and excellent bulkiness, it is a structure in which the cutting or slack of the sheath yarn is suppressed, and the unwinding property is also good. The results are shown in Table 3.

[Embodiment 8]

All were carried out in accordance with Example 7 except that the air flow rate was changed by 500 m/s.

In Example 8, by increasing the gas flow rate, the tension between the nozzle-traction rolls was lowered, and the progress of the processed yarn was disturbed several times, but the processed yarn was collected without problems. In the processed yarn, the slack of the loop is rare, and the unwinding property is no problem, and the elastic fluff yarn having the characteristics of the present invention can be collected. The results are shown in Table 3.

[Examples 9, 10]

Except for the conjugate fiber used for the core yarn, the ratio of the A polymer to the B polymer was changed to 60/40 (Example 9) and 30/70 (Example 10), and all were carried out in accordance with Example 2.

In the ninth embodiment, there is no large difference in the crimped form of the core yarn, and the characteristics are almost the same as those in the second embodiment because the shape of the loop of the processed yarn is not greatly affected.

In Example 10, since the crimped form of the core yarn became small, the number of loops was lowered, and the elongation recovery ratio was increased as compared with Example 2. The results are shown in Table 4.

[Examples 11, 12]

The obtained eccentric core-sheath composite fiber of PET1/PET2 (Example 11) and PBT/PET2 (Example 12) was used for the composite nozzle of the eccentric core-sheath composite cross section illustrated in Fig. 4 (4-2). The core yarns were all carried out in accordance with Example 2 except that the turning point was made 0.0006.

In Example 11, the number of loops was somewhat lower than that of Example 2. On the other hand, in Example 12, the number of loops was increased as compared with Example 4, and the elasticity was increased due to the restraint of the sheath yarn and the core yarn. The results are shown in Table 4.

[Comparative Example 4]

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

In the sample of Comparative Example 4, after the heat treatment, the sheath yarn exhibited a 3-dimensional crimp shape, but the radius of curvature of the fibers forming the loop was Ten micrometers are very fine, and the shear of the sheath yarn is seen everywhere (there is a fracture: 0.4). Moreover, since this crimped form is exhibited, the loop of the sheath yarn is significantly smaller than that before the heat treatment, and it is less than 0.6 mm from the surface of the yarn. Therefore, although the feel of the processed yarn is unique like rubber, it does not have the bulkiness and softness of the object of the present invention. Further, due to micron-scale fine crimping, breakage of the sheath yarn, and unevenness in the protrusion of the loop, the coefficient of static friction between the fibers is relatively high (0.4), and it is difficult to say that the unwinding property of the drum is good. The results are shown in Table 4.

[Example 13]

For the purpose of improving the elasticity and flexibility of the processed yarn, the 3GT used in the polymer of Example 5 was melted at 275 ° C, and then metered into the spinning assembly, from the three slits illustrated in FIG. (width: 0.1 mm, 23 of FIG. 8) is arranged in a concentric circular hollow cross-section discharge hole, and is discharged so as to have a hollow ratio of 10%. After the spun yarn was spun at a flow rate of 20 m/min and cooled and solidified at a flow rate of 20 m/min, the undrawn yarn was taken up at a spinning speed of 1500 m/min after the spinning oil was supplied. Except for the fiber (single yarn fineness 7.0 dtex) which was stretched by 2.8 at an elongation speed of 800 m/min between the rolls heated to 70 ° C and 130 ° C as the core yarn, all according to the examples. 1 implementation.

In the thirteenth embodiment, the loops composed of the sheath yarns protruded from the surface of the yarn by an average of 38.0 mm, and the fluff yarns in which the loops were formed in the number of 22/mm were obtained. This outstanding terry system is excellent in uniformity in cycle size and cycle. Further, the sheath yarn of the processed yarn has a millimeter-scale three-dimensional crimping structure having a radius of curvature of 5.7 mm, and a broken portion is not seen in the loop of the sheath yarn, and a continuous loop is formed. (Fracture place: 0.0)

In the fluffy yarn, the sheath yarn forming the continuous loop has a three-dimensional crimping structure, the coefficient of static friction between the fibers is 0.1, and the unwinding property of the processed yarn is not problematic, and jamming does not occur, and the smooth roll can be smoothly performed. Take the roller to unwind (unwinding: S). In addition, the 10% modulus of the resistance at the time of expansion and contraction is particularly low at 1.2 cN/dtex, and the fiber recovery rate after the load is applied is 100%, and the fatigue resistance is excellent, and it is soft to be stretched with low stress. The elasticity of the hand (feel: S). The results are shown in Table 5.

[Embodiment 14]

For the purpose of further improving the elasticity and the fatigue resistance of the example 13, the polymer was changed to a PBT-based elastomer ("Hytrel" manufactured by Toray-DuPont), and the spinning temperature was set to 260 ° C to collect the core yarn. Implemented in accordance with embodiment 13.

In the fourteenth embodiment, the polymer type of the core yarn was changed to a PBT-based elastomer having excellent flexibility. In the fluffy yarn, the 10% modulus was also significantly lower than that of the Example 13, and both the elasticity and the flexibility were excellent. In addition, the fiber length recovery rate is also greatly increased, and even when it is deformed by applying high stress, it is hardly fatigued, and when it is used for clothing, it is known that it is suitable for a material in which a portion where deformation and compression are repeatedly applied or a portion where elongation and deformation are large. The results are shown in Table 5.

[Example 15]

Polypropylene (PP: MFR = 9 g/10 min) as an island component was melted at 265 ° C, and PET 3 (0.65 dl / g) used in Example 1 as a sea component was melted at 300 ° C, and then metered. Into the spinning unit, the spinning zone temperature is 280 ° C, and the hollow island composite yarn of the island structure having a hollow portion at the center of the fiber section and having a donut-shaped island structure around it is melt-spun as shown in FIG. . The spinning nozzle incorporated in the spinning unit is a composite nozzle composed of a metering plate and a distribution plate described in Japanese Laid-Open Patent Publication No. 2011-174215, and is used as a distribution plate, and a distribution hole is not provided in the center portion of the plate. a circular space in which a distribution hole of a ring-shaped sea component polymer is arranged, and a partition hole of a distribution hole of a sea component polymer which is surrounded by a hole of 6 holes in the outer periphery of the island component polymer . The composite polymer flow system discharged at a composite ratio of island/sea = 30/70 was sprayed at a flow rate of 100 m/min from a single side to a cooling air of 20 ° C to be cooled and solidified, and then an oil agent was applied at 1200 m/min. After the unwinding yarn was taken up by the spinning speed, it was extended 2.9 times at an elongation speed of 600 m/min between the rolls heated to 90 ° C and 130 ° C to form a fineness of 78 dtex, the number of filaments was 12, and the number of islands per filament was 32 islands, extended yarns with a hollow ratio of 30% and a density of 0.87 g/cm ³ . Further, the hollow island composite yarn is cooled asymmetrically at a high speed, and is asymmetrically cooled around the fibers, and exhibits gentle crimping after heat treatment.

In the procedure illustrated in FIG. 6, the obtained hollow island composite yarn was supplied to each of the two supply rolls, and one of the supply rolls was set to a speed of 50 m/min, and the other was set to the other. The speed is 1000m/min to attract the nozzle for attraction. In the suction nozzle, the compressed yarn was sprayed at a flow velocity of 400 m/s at 20°, so that the core yarn and the sheath yarn were ejected from the nozzle together with the accompanying air flow without being entangled. The sliver ejected from the nozzle traveled for 1.0 × 10 ^-4 seconds together with the air flow, and the yarn guide was changed by a ceramic guide to form a processed yarn having a loop composed of a sheath yarn, which was 50 m/by a pulling roller. Min traction.

Next, the processed yarn was guided to a tube heater by a roller, and heat-treated at 150 ° C for 10 seconds to shape the fluff yarn, and at the same time, the sheath yarn exhibited a 3-dimensional crimp. The fluffy yarn was wound around the drum at 52 m/min by a tension-controlled coiler placed behind the tube heater. Further, the polyfluorene-based oil agent is uniformly sprayed on the collected fluffy yarn by spraying, and the final amount of the polyoxymethane adhered is 1% by weight with respect to the fluffy yarn, and the polyfluorene-based oil system is sprayed. Take The concentration of 8 wt% contained polysiloxane, which was heat-treated at 165 ° C for 20 minutes to collect processed yarn.

The fluff yarns collected in Example 15 had a structure in which the loops composed of the sheath yarns protruded from the surface of the yarn by 21.0 mm on average, and the loops were formed in a number of 22 pieces/mm. This outstanding terry system is excellent in uniformity in cycle size and cycle.

The core yarn and the sheath yarn have a millimeter-scale three-dimensional crimping structure having a radius of curvature of 4.5 mm, and a broken loop is not seen in the loop of the sheath yarn, and a continuous loop is formed. (Fracture site: 0.0)

In the fluffy yarn, the sheath yarn forming a continuous loop has a three-dimensional crimping structure, and the coefficient of static friction between the fibers is 0.1, and the unwinding of the reeling drum is very smooth, and the unwinding property is excellent (unwinding property) :S). Further, it has a bulkiness derived from the specific structure of the present invention, and has a soft touch (hand feeling: S). In Example 15, although the elasticity was lower than that of Example 1, it was excellent in performance of 645 inch ³ / 20 g in the evaluation of fluffiness. The results are shown in Table 5.

[Examples 16, 17]

In addition to changing the composite ratio of the island/sea of the hollow island composite yarn used in the sheath yarn and the density of the stretched yarn to island/sea = 20/80 and density of 0.90 g/cm ³ (Example 16), island/sea = 10 Except for /90 and a density of 0.93 g/cm ³ (Example 17), it was carried out in accordance with Example 15.

The fluffy yarn collected in Example 16 was not found in the loop of the sheath yarn, and was a continuous loop. The sheath yarn has a three-dimensional crimping structure, and has excellent unwinding property (unwinding property: S) from the wound roller, and has a soft feeling (feel: S). In addition, in the evaluation of the fluffy, the excellent fluffiness of 606 inch ³ / 20 g was exhibited.

The fluffy yarn collected in Example 17 was in a place where the loop of the sheath yarn did not see a break, and a continuous loop was formed. The sheath yarn has a three-dimensional crimping structure, and has excellent unwinding property (unwinding property: S) from the wound roller, and has a soft feeling (feel: S). In addition, in the evaluation of the fluffy, it is good fluffy with 581 inch ³ /20g. The results are shown in Table 5.

[Examples 18, 19]

In addition to the PBT/PET2 eccentric core-sheath composite fiber used in Example 12, the feed speed was changed to 50 m/min for core yarn, 500 m/min for sheath yarn (Example 18), core yarn 20 m/min, sheath Except for the yarn of 1000 m/min (Example 19), all were carried out in accordance with Example 12.

In Example 18, in which the supply speed ratio was reduced, the loop size was somewhat smaller than that of Example 12, but it exhibited good elasticity of the characteristics of the present invention and exhibited an excellent hand feeling.

In Example 19 in which the supply speed ratio was increased, although the size of the loop was 38.0 mm, which was larger than that of Example 12, the slack of the loop was hardly obtained. Although the texture is excellent in fluffiness, it is a structure in which the shearing and slack of the sheath yarn are suppressed, and the unwinding property is also good. The results are shown in Table 6.

[Examples 20, 21]

Except that the PBT/PET2 eccentric core-sheath composite fiber used in Example 12 was used for the core yarn, and the PP/PET3 hollow island composite yarn used in Example 15 was used for the sheath yarn, all were carried out in accordance with Example 15. (Example 20 ). Further, as a case where the supply speed ratio was changed, a processed yarn of 20 m/min of the core yarn and 1000 m/min of the sheath yarn was also collected (Example 21).

In Example 20, a loop having a resilience from the PET component while having a low density was formed, and in the same manner as in Example 15, very excellent bulkiness was exhibited, and the eccentric core sheath composited from the core yarn was exhibited. The previously unsatisfactory properties of good elasticity from yarn.

In Example 21, by further increasing the sheath/core ratio, the loops were enlarged by the sheath yarn, and the bulkiness was further improved as compared with Example 20. In the case of Example 21, although the loop was enlarged, the homogeneity was excellent in the fiber axis direction of the processed yarn, and the slack of the loop was not observed. Further, by winding the sea-shell hollow fiber having a large crimp on the elastic core yarn having the curl, the loop is self-supporting, and also has the effect of the PET component, and has a comfortable resilience. The results are shown in Table 6.

[Example 22]

All of them were carried out in accordance with Example 20 except that the high elastic yarn caused by the PBT-based elastomer ("Hytrel") used in Example 14 was used for the core yarn.

In the processed yarn of the embodiment 22, the elastic yarn which is deformed by elongation with low stress is used in the core yarn to exhibit excellent elasticity, and even if it is deformed in a relatively high order, the fiber length does not change and the restorability is excellent. Further, in the same manner as in Example 20, an island hollow yarn was used for the sheath yarn, and the bulkiness was also excellent.

Claims (12)

A fluffy yarn comprising a sheath yarn forming a continuous loop without breaking and a bulk yarn which is substantially fixed to the core yarn of the sheath yarn by interlacing with the sheath yarn, wherein a loop of 3.0 mm or more is protruded from the surface of the yarn The number is from 1/mm to 30/mm, the modulus of elasticity is 80 cN/dtex or less, and the elongation recovery at 10% elongation recovery is 50% or more. The bulky yarn of claim 1, wherein the single yarn fineness constituting the fiber 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 fluffy yarn according to claim 1 or 2, wherein the core yarn is a side-by-side or eccentric core-sheath type composite fiber, and constitutes a three-dimensional crimped structure yarn having a fiber system having a curvature radius of 2.0 mm to 30.0 mm. A fluffy yarn according to claim 1 or 2, wherein in the fluffy yarn comprising the sheath yarn forming the loop and the core yarn substantially fixed by the sheath yarn, the sheath yarn is substantially not broken A continuous loop is formed and is a composite fiber having a density of less than 1.00 g/cm ³ . A fluffy yarn according to claim 4, wherein the sheath yarn has a 3-dimensional crimping configuration. A fluffy yarn according to claim 4 or 5, wherein the sheath yarn is a sea-island composite fiber having a hollow section having a hollow ratio of 20% or more. The fluffy yarn of claim 6, wherein the island component of the island composite fiber is composed of polyolefin, and the sea component is composed of polyester. A fluffy yarn according to claim 1 or 2, wherein in the fluffy yarn comprising a sheath having a three-dimensional crimping structure forming a loop and a core yarn substantially intertwined with the sheath yarn, 10% When the modulus is less than 1.5 cN/dtex, the fiber elongation ratio at the time of load application is 1.1 or more, and the fiber length recovery ratio after elongation is 80 to 100%. The bulky yarn of claim 8, wherein the fiber elongation ratio at the time of load application is 1.5 or more, and the fiber length recovery rate after elongation is 90 to 100%. The fluffy yarn according to any one of claims 1 to 9, which has a coefficient of static friction between fibers of 0.3 or less. A fluffy yarn according to any one of claims 1 to 10, wherein both the core yarn and the sheath yarn comprise hollow cross-section fibers having a hollow ratio of 20% or more. A fibrous article comprising the fluffy yarn of any one of claims 1 to 11 in at least a portion.