KR102278861B1 - Bulkysa - Google Patents

Abstract

In a bulky yarn comprising a sheathing (1) that forms a continuous loop without breaking, and a core (2) that substantially fixes the sheathing (1) by intersecting the sheathing (1), it protrudes by 3.0 mm or more from the surface layer of the yarn A bulky yarn in which the number of loops is 1 piece/mm to 30 pieces/mm, the elastic modulus is 80 cN/dtex or less, and the elongation recovery rate at 10% elongation recovery is 50% or more. In addition to good feel, there is provided a bulky yarn having excellent light weight, thermal insulation properties, and the like, and stretch properties.

Description

Bulkysa

The present invention relates to a bulky yarn in which a large number of loops are formed on the surface layer, and since it has a soft touch and high thermal insulation properties can be requested, it can be applied in a wide range of fields from medical use to industrial use.

Synthetic fibers made of a thermoplastic polymer such as polyester or polyamide have high basic properties such as mechanical properties and dimensional stability, and are characterized by excellent balance. For this reason, fiber materials utilizing these materials are widely used not only for medical purposes, but also for interiors, vehicle interiors, and industrial purposes, as well as for medical purposes, in addition to the expression of basic performance by spinning from polymer properties, and by high-order processing to form various structures.

It is not an exaggeration to say that technological innovation has been made with the motive of imitation of natural materials in the development of new technologies for synthetic fibers, and various technological proposals have been made in order to express the functions derived from the complex structure of nature with synthetic fibers. . For example, there are various things such as the expression of a unique touch (creativity, flexibility) by imitating the cross-section of silk, the structure color represented by morpho butterfly, and the water repellency performance shown in the leaf of a lotus flower, etc., but one of them is a natural feather. There is a challenge to the expression of functions such as soft touch and light weight and warmth.

Natural feathers are generally obtained in small amounts from the chest of waterfowl, and are used by mixing down balls (in the form of cotton wool) and feathers (in the form of feathers). These are derived from the specific structural form made of keratin fibers, have a rich soft feel, are easy to follow, and express excellent light weight and heat retention. For this reason, products using natural feathers as filling cotton are aware of their functions even by general users, and are widely applied to medical products such as bedding and jackets.

However, from the point of view of conservation of waterfowl, there is a limit to the total production of natural feathers. Also, due to the recent abnormal weather or the occurrence of infectious diseases, the supply amount fluctuates greatly, and in addition to the price rise, unstable supply amount is a problem. In addition, in the use of natural feathers, despite many processes such as hair removal, selection, disinfection, and degreasing, a characteristic odor and animal allergy are often problems. In addition, from the point of view of animal protection, there is a movement to exclude the use of natural feathers in Europe and the like. For this reason, attention is focused on a cotton material made of synthetic fibers that can be supplied stably.

Although many synthetic fibers have been proposed for a long time, there has been no case of reaching natural feathers in terms of basic properties such as bulkiness, compression recovery, and soft feel.

For example, as shown in Patent Literature 1 and Patent Literature 2, the bulkiness derived from the structure is improved by making the fiber aggregate state spherical or radial.

Conventionally, yarn processing technology used for the purpose of increasing the added value of fibers, for example, untwisting after applying actual twist to the fiber, or mixing one or more types of fibers with a fluid processing nozzle, etc. It is generally known that a processed yarn having bulky properties can be manufactured. Since the processed yarn having such bulkiness is basically a long fiber, it can be processed into various shapes, and it is also considered to be applied to the cotton material by utilizing the bulkiness and soft feel of the processed yarn.

In Patent Document 3, two types of fibers are used and supplied to a waist gauge while providing yarn runout or the like to only one fiber, and a loop is formed on the surface layer by the fibers to which yarn runout etc. is applied by applying actual twist at once. Thereafter, a technique for obtaining bulky processed yarn by untwisting by rubbing with two disks or the like is also disclosed. Certainly, with this technique, there is a possibility that a bulky yarn having a loop made of the sheath yarn can be obtained by adjusting the degree of yarn runout or the like in accordance with the conventional method.

Patent Document 4 is a technique in which the excessively supplied sheath yarn is fixed with a difference in yarn length by spraying compressed air from a direction perpendicular to the running yarn in the interlacing nozzle, opening and entangling the yarn. In Patent Document 4, there is a possibility that a bridging yarn having a bulky property present in the surface layer of the weft yarn having a loop shape can be obtained.

Japanese Patent Publication No. 48-7955 publication Japanese Patent Publication No. 51-39134 Gazette Japanese Patent Laid-Open No. 2011-246850 Japanese Patent Laid-Open No. 2012-67430

What is shown in Patent Document 1 and Patent Document 2 is that a feeling of foreign matter is felt when compressed, and does not reach the point of view of the soft feel of a natural feather. In a fibrous structure mainly composed of these short fibers, the bulkiness and flexibility (compression recovery) of the structure are attributed to the mechanical properties and fineness (thickness) of the fibers used. For this reason, it was necessary to further improve in order to achieve both bulkiness and flexibility such as natural feathers.

In Patent Document 3, when an actual twist is applied to a partially protruding loop yarn and the twist is unwound while being rubbed with rubber or the like in a mechanical friction machine, the protruding loop is partially broken or deteriorated. When the above-mentioned processed yarn is used as a cotton pad, since it is finally filled by tying several to several dozen or so, the deteriorated part (fluff) becomes remarkably entangled with the yarn of another processed yarn. When these entangled super yarns are filled, a feeling of foreign material is created, impairing the tactile feel, or promoting entanglement, resulting in a decrease in bulkiness over time.

In Patent Document 4, when the running threads in the nozzle are disturbed, and the fibers are opened and entangled, the threads are shaken in a very short period to cause entanglement of the running threads. For this reason, small loops influenced by the shape of the nozzle spontaneously are formed excessively at high frequency. In addition, the size of the loop fluctuates in the direction of the fiber axis by randomly entangled yarns and yarns, and thus there is a limitation in bulkiness. In addition, after the loop yarn formed in the nozzle stays inside the nozzle, it is discharged out of the nozzle by the blowing air. For this reason, the size of the loop or the length of the primary yarn forming the loop in the fiber axis direction of the processed yarn fluctuates to form looseness. In this case, especially loose sheath yarns tend to get entangled with the other yarns, and again, problems remain, such as process passability in high-order processing, and locations where yarns are entangled with each other by a feeling of foreignness.

In addition, when using a processed yarn as described in Patent Document 3 and Patent Document 4 as a cotton pad, in addition to the problems related to bulkiness and feel described earlier, for the purpose of suppressing entanglement and twisting, both ends of the processed yarn fixed and used. However, in the processed yarn described in Patent Document 3 or Patent Document 4, since the processed yarn itself does not have extensibility, the interlaced yarn fixed to a regular length is supported in the filling, and if there is no room in the design or size, an unpleasant feeling of restraint is created. There are cases. In particular, when sewing with clothing, etc., it is necessary to design a design with room for the elbow, knee, neck, and waist, which has a large range of motion, so there is a case where the function such as heat retention cannot be sufficiently exhibited due to the useless air gap. there was.

For this reason, while having very high bulkiness due to loops, entanglement between processed yarns is suppressed, and bulky yarns having good stretch properties are desired.

It is an object of the present invention to provide a bulky yarn suitable for a high-performance thermal insulation material.

The said subject is achieved by the following means.

(1) In a bulky yarn comprising a sheath yarn that forms a continuous loop without breaking and a core yarn that substantially fixes the sheath yarn by intersecting the above yarn, the number of loops protruding from the surface layer of the yarn by 3.0 mm or more is 1/mm to A bulky yarn of 30 pieces/mm, an elastic modulus of 80 cN/dtex or less, and an elongation recovery rate of 50% or more at 10% elongation recovery.

(2) The bulky 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 and the yarn is in the range of 0.5 to 2.5.

(3) The bulky yarn according to (1) or (2), wherein the core is a side-by-side or eccentric core-sheath composite fiber, and the fibers constituting the sheath are three-dimensional crimped structural yarns with a radius of curvature of 2.0 mm to 30.0 mm.

(4) In a bulky yarn comprising a sheath yarn forming a loop and a core yarn substantially fixing the sheath yarn by intersecting the sheath yarn, the sheath yarn forms a continuous loop without substantially breaking, and the density is less than 1.00 g/cm 3 The bulky yarn according to (1) or (2), which is a composite fiber of

(5) The bulky yarn according to (4), wherein the super yarn has a three-dimensional crimped structure.

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

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

(8) In the bulky yarn consisting of a core yarn having a three-dimensional crimped structure forming a loop, and a core yarn that substantially fixes the sheath yarn by intersecting the sheath yarn, the 10% modulus is less than 1.5 cN/dtex, and when a load is applied The bulky yarn according to (1) or (2), wherein the fiber elongation ratio is 1.1 or more, and the fiber length recovery rate after stretching under load is 80 to 100%.

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

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

(11) The bulky yarn according to any one of (1) to (10), wherein both the core yarn and the sheath yarn are made of hollow cotton fibers having a hollow ratio of 20% or more.

(12) A textile product comprising at least a part of the bulky yarn according to any one of (1) to (11).

(Effects of the Invention)

Since the bulky yarn of the present invention has a unique bulky structure in which a loop having a three-dimensional crimp shape is formed on the surface layer, entanglement between the bulky yarns is suppressed, so that in addition to a good feel without a foreign body feeling, excellent light weight and heat retention, etc. In addition, since it has a comfortable stretch property that elongates and deforms under low stress, for example, in addition to adhesion, it is excellent in motion followability of flexibly elongating and deforming according to movement, and it is compact because there is no need to create an unnecessary void. It can be used as a high-performance lightweight thermal insulation material with good wearability and excellent thermal insulation function.

1 is a schematic side view of an example of a bulky yarn of the present invention;
2 is a schematic diagram illustrating a method for measuring a real surface;
3 is a schematic diagram for explaining a three-dimensional crimp (spiral) structure;
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 bulky yarn of the present invention;
5 is a view schematically showing an example of a cross section of a hollow island composite yarn constituting the bulky yarn of the present invention;
6 is a schematic process diagram schematically showing an example of the manufacturing method of the bulky yarn of the present invention;
7 is a schematic side view for explaining the suction nozzle used in the manufacturing method of the bulky yarn of the present invention;
Figure 8 is a schematic cross-sectional view for explaining the discharge hole of the spinneret for hollow cross-section used in the manufacturing method of the bulky yarn of the present invention

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail with preferred embodiment.

In the bulky yarn of the present invention, the bulky yarn is composed of a core yarn that forms a continuous loop without breaking, and a core yarn that substantially fixes the sheath yarn by intersecting the sheath yarn, the number of loops protruding more than 3.0 mm from the surface layer of the yarn is one /mm to 30 pieces/mm, elastic modulus is 80 cN/dtex or less, and the elongation recovery rate at 10% elongation recovery is 50% or more.

The bulky yarn of the present invention is composed of a core yarn forming a loop and a core yarn that substantially fixes the sheath yarn by intersecting the sheath yarn. Further, the present invention is characterized in that the loop is not broken and a continuous loop is formed.

The bulky yarn of the present invention is preferably composed of synthetic fibers from the viewpoint of making use of the characteristics of the present invention at the time of process passability and actual use when performing bulky processing. Synthetic fibers as used herein refer to fibers made of high molecular weight polymers. Among high molecular polymers, thermoplastic polymers capable of melt molding are suitable for use in the present invention because the fibers used in the present invention can be manufactured by employing a high-productivity melt spinning method.

As the thermoplastic polymer referred to herein, for example, polyethylene terephthalate or a copolymer thereof, polyethylene naphthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyolefin, polycarbonate, polyacrylate, polyamide, polylactic acid, thermoplastic Polymers which can be melt-molded, such as polyurethane, are mentioned.

Among these thermoplastic polymers, polycondensation polymers typified by polyester and polyamide are crystalline polymers, and because of their high melting point, deterioration or settling occurs even when heated to a relatively high temperature during post-processing, molding processing, and actual use. It is suitable without From a viewpoint of this heat resistance, it is good and preferable that melting|fusing point of a polymer is 165 degreeC or more.

In addition, from the viewpoint of improving the lightness of the bulky yarn of the present invention, it is more preferable to use at least a part of low-density polypropylene, which is a polyolefin. Here, in order to have not only light weight but also settling resistance against compression, etc., the molecular weight of the polypropylene to be used is preferably higher, and if the melt flow rate (MFR), which is an index of the molecular weight, is 20 g/10 min or less good. MFR as used 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. If the MFR of the polypropylene to be used is within this range, in addition to making it difficult to settling against compression and bending during use as bulky yarn, it also sufficiently withstands the impact received during processing, so there is no problem in process passability. do. In addition, when polypropylene is used for at least a part of the bulky yarn of the present invention, it is particularly preferable to use polypropylene containing an antioxidant in order to prevent oxidative heat generation during use in medical products or the like.

The polymer used in the present invention may contain various additives such as inorganic substances such as titanium oxide, silica and barium oxide, carbon black, colorants such as dyes and pigments, flame retardants, optical brighteners, antioxidants, or ultraviolet absorbers in the polymer. do.

As illustrated in FIG. 1, the bulky yarn of the present invention is composed of a sheath (1 in FIG. 1) forming a loop and a core (2 in FIG. 1) that substantially fixes the sheath by intersecting the above yarn.

The core as used herein means a filament present at a distance of 0.6 mm or less from the yarn surface (3 in Fig. 2). The yarn surface means a straight line connecting the yarn guide guides 4 when the processed yarn is hung at a regular length between a pair of yarn guides (4 in Fig. 2). A filament having a distance (5 in Fig. 2) of 0.6 mm or less from the surface of the yarn becomes the core in the present invention and serves as the starting point of the loop. In addition, the filament protruding in a loop shape at a distance from the yarn surface of 3.0 mm or more is the super yarn as referred to in the present invention, and is responsible for the bulkiness of the bulky yarn of the present invention. Although the present invention is characterized in that it consists of a core yarn that substantially fixes the sheath yarn forming the loop, the term "substantially fixed" as used herein means that the sheath yarn is independent from the point where the sheath yarn intersects with the core yarn as a starting point. Starting from the intersection of the core yarn and the first yarn as a starting point, the second yarn standing in the direction of the outer layer of the bulky yarn and forming a loop indicates a self-supporting state. In addition, the point where the core and the intersecting point, ie, the vicinity of the starting point of the loop, is actually in a state in which the filament bundles are wound around each other in many cases. For this reason, the point where the primary yarn forming the apex of the loop at 3.0 mm or more from the surface of the yarn intersects with a straight line located at 0.6 mm from the surface of the yarn is an intersection point.

The junction has a role of supporting the independence of the loop made of the sheath yarn, which is a feature of the present invention, and it is preferable to exist at a certain period of time. From this point of view, it is necessary to make the intersection point of the core yarn and the first yarn in the bulky yarn exist at 1/mm to 30 pieces/mm. If it is within this range, it means that loops exist with an appropriate interval, and stretchability (stretch recovery), which is an important element of the present invention, is not disturbed. If this point of view is promoted, as a preferable range in which good stretch properties are expressed while playing a role of fixing the loop, the more preferable range of the abutment points being 5/mm to 15 pieces/mm is mentioned.

It is possible by utilizing a phototype fluff detection device to continuously evaluate the examination and the determination of the first yarn, and the number of loops in the vicinity of a unit length in the direction of the fiber axis of the processed yarn. For example, 0.6 mm and 3.0 mm from the yarn surface may be evaluated using a photoelectric fluff measuring device (TORAY FRAY COUNTER) under the conditions of a yarn speed of 10 m/min and a running yarn tension of 0.1 cN/dtex.

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

The protrusion of the loop as used herein corresponds to the distance from the surface of the yarn (5 in Fig. 2), and two-dimensionally observing the processed yarn hung on a pair of yarn guides at a regular length from the side, from the observed image, is to measure Ten randomly selected yarns are photographed so that the entire loop can be observed, and protrusions of ten loops are photographed in each image. This operation is performed for a total of 10 images, and a total of 100 places is measured to two decimal places in millimeter units. The average value of these numerical values was computed, and the value which rounded off to two decimal places or less was made into the loop size (protrusion) in this invention.

According to the study of the present inventors, it is preferable that the loop protrudes in the range of 3.0 mm to 100.0 mm from the surface of the yarn. The effect can be exerted without any problem. Moreover, when the workability of the bulky yarn mentioned later is considered, 3.0 mm or more and 70.0 mm or less are more preferable. In addition, considering that repeated compression recovery deformation is applied in an excessively harsh environment such as sports clothing, it is particularly preferably set to 5.0 mm or more and 60.0 mm or less.

The shape of the loop made of super yarn here is one that protrudes from the core to the outer layer from the point of intersection, and the shape is preferably a cool nodal loop (teardrop shape) rather than an arcuate loop formed by a general bridge. In the case of the cool nodal loop, since the loop is almost fixed at the point of intersection with the core, it is easier for the loop of the super yarn to return to its original shape even after compression deformation compared to the arcuate loop. In order to exhibit the above shape is suitable. In addition, it was also found that the sheath yarn having a three-dimensional crimped structure is preferable from the viewpoint of suppressing entanglement between the sheath yarns, and by employing this yarn, a dramatic expression of bulkiness can be achieved by a synergistic effect with the loop shape.

On the other hand, in the examination of the present inventors, it was found that the above-mentioned effect tends to decrease when the loop made of the sheath yarn is broken on the way or is partially deteriorated. For this reason, it is important that the weft yarn does not break in the middle of a loop from a viewpoint of making compatible the opposing characteristic of suppression of bulkiness and entanglement which is not conventionally.

Determination of this fracture can be confirmed by observing at a magnification at which the next intersection (the whole loop) can be confirmed from the intersection of the first and second yarns, respectively, at 10 locations randomly selected from the processed yarn. Observe for 10 sheath yarns in each of the 10 sites to be observed, and the number of fractured points in the average of 100 total is 0.2 or less, the sheath yarn according to the present invention is in a state in which the sheath yarn is not partially broken and forms a continuous loop means that In this range, the sheath yarn in which the end of the yarn is freed does not exist substantially, and it can exist without being intertwined with other sheath yarns. In the case of adding the process of untwisting after applying the conventional actual twisting, or disturbing the inside of the nozzle by strong air injection, or opening the fiber, the running thread is thrown into the nozzle made of metal at a high frequency and may break or deteriorate. . Moreover, when it is going to form a loop like this invention, since it is necessary to untwist by rubbing between rubber disks etc., the sheath yarn will break or deteriorate significantly. For this reason, the fractured sheath yarn is wound around or entangled with another sheath yarn to promote a fastener effect, resulting in restrictions on the structural form of the finished yarn and high-order processing. In the present invention, this point is greatly improved, and the effect produced by the weft yarn can be sufficiently exhibited.

The sheath yarn of the present invention preferably has a three-dimensional crimped structure. The three-dimensional crimped structure as used herein means that the single filaments of the filaments as illustrated in FIG. 3 have a spiral structure. The evaluation of this three-dimensional crimping can be evaluated by collecting 10 or more single yarns from 10 randomly selected locations from the processing yarn, and observing each single yarn at a magnification that can confirm the crimped form with a digital microscope, etc. . In this image, when the observed single yarn has a spirally turned shape, it is determined that it has a three-dimensional crimped structure, and in the case of a straight shape, it is determined that it does not have a crimped structure.

In order to make the present invention more effective, the curvature radius of the three-dimensional crimp of the sheath yarn is in the micron order (10 ^-6 m) expressed by the latent crimp yarn collected by a general manufacturing method such as a conventional side-by-side composite fiber or hollow fiber. Rather, it is preferable that it is milli order (10 ^{-3 m).} In the present invention, the bulkiness and repulsion properties of the processed yarn in the circumferential direction and the cross-sectional direction can be freely controlled by the size of the three-dimensional crimping. It also becomes possible to suppress entanglement. In particular, by setting the size of the crimp on the order of millimeters, it is mainly excellent from the viewpoint of coexistence of bulkiness and compressibility of the first yarn and, in addition, the balance with suppression of entanglement of the first yarn.

In the present invention, it is preferable that the radius of curvature of the spiral structure is in the range of 2.0 mm to 30.0 mm. The radius of curvature of the spiral structure as used herein is the same method as for determining the presence or absence of three-dimensional crimping described above, and the curvature ( It is defined as a length corresponding to the radius of a perfect circle inscribed the most at two or more places in 6) of FIG. 3 . At least 10 single yarns are collected from 10 randomly selected locations from the processing yarn, and each single yarn is observed at a magnification that can check the crimped form with a digital microscope, etc., so that a total of 100 single yarns are measured in millimeters with two decimal places. measure up to A simple average of these measured values was calculated, and the value obtained by rounding off to two decimal places or less was taken as the radius of curvature of the three-dimensional crimped structure of the present invention.

The radius of curvature is more preferably 2.0 mm to 20.0 mm, and if it is within this range, it means that the loop made of the sheath yarn has a crimp like a spring. For this reason, while the bulky yarn has a moderate repulsive feeling against the compression in the cross-sectional direction, the first yarn comes into contact with the point, and a very pleasant bulky property is obtained. Moreover, it is especially preferable that it is 3.0 mm - 15.0 mm as a range which exhibits the effect of this invention favorably in consideration of the balance with the loop with high workability mentioned later. In such a range, there is no problem with regard to long-term durability, and the effect of the present invention is effective when applied to medical applications where repeated compression recovery is applied, particularly sports clothes used in an excessively harsh environment.

What is necessary for the expression of this effect is not the two-dimensional bending that can be provided by mechanical press-fitting or the like, but it is necessary that the single yarn itself has a three-dimensional three-dimensional shape and has a spiral or a structure similar thereto. Conventionally, these crimped forms have not been accepted as first yarn because they are relatively prone to fastener phenomenon due to entanglement of yarns. This is because the fibers that have been mainly employed are general latent crimped fibers with fine crimps on the order of microns. In this case, the fastener effect may be promoted by the fine spiral structures meshing with each other.

On the other hand, the present inventors promoted the examination paying attention to the shape of the yarn in order to achieve suppression of entanglement between the processed yarns of the present application. As a result, it was found that, in particular, in the case where a three-dimensional crimp of the order of millimeters was formed in a bulky yarn having loops, a phenomenon completely opposite to that of the conventional recognition occurred. This is because the first yarn has three-dimensional crimping, even when it is made into a yarn bundle, the bulky yarns exist with an excluded volume on the contrary, entanglement is greatly suppressed, and it can be considered as a synergistic effect with the structure called the loop made of the sheath yarn. can That is, the primary yarn of the bulky yarn of the present invention has a movable space depending on the size of the loop, and according to the definition of the present invention, it has a relatively large movable space in a hemispherical shape with a radius of 2.0 mm or more centered on the fixing point of the loop. do. In this case, single yarns having three-dimensional crimps having an overwhelmingly large size with respect to the fiber diameter contact each other at points and repel each other, so they can exist alone without being entangled. In addition, in addition to the above-described movable space in the three-dimensional crimped filament, the single yarn itself can be stretched like a spring in the fiber axis direction, so that when single yarns cross each other, vibration is applied. can do. This is a phenomenon only in the structural form in which the primary yarn forms loops of several to tens of times as in the bulky yarn of the present invention. In addition, the three-dimensional crimping of this super yarn works effectively also from the viewpoint of bulkiness, which is a basic characteristic of the present invention. That is, the above-mentioned point contact between the first yarns produces an effect of repulsing each other even within one processed yarn, and the initial bulkiness as well as the radially opened state in the cross-sectional direction of the processed yarn can be maintained over time. The spring-like behavior of the radially-opened sheath yarn of the present invention is difficult to achieve with conventional only straight filaments. In addition, it is caused by the repulsion between the sheath yarns, and when the sheath yarns having three-dimensional crimps support each other, settling of the sheath yarn can be significantly suppressed.

The morphological characteristics of the super yarn of the present invention that it forms a loop and has a three-dimensional crimped structure can also be seen as a decrease in the coefficient of friction. As described above, this is the effect of contact with the guitar at the point, and is one of the effects of the bulky yarn having the specific structure of the present invention. In the study of the present inventors, in order to suppress entanglement between processed yarns while having bulkiness, the coefficient of static friction between fibers is preferably 0.3 or less. The coefficient of static friction between fibers referred to herein is measured by a method according to JIS L 1015 (2010) with a radar-type friction coefficient tester. In addition, in this invention, if it is not necessary, processing, such as opening, is not performed, but it evaluates by arranging processed yarn in parallel in a cylinder. When the bulky yarn of the present invention is processed into a textile product, when the fibers slide and move properly during compression, the feel increases. Therefore, the coefficient of static friction between fibers is preferably low, more preferably 0.2 or less, and 0.1 or less. It is particularly preferred.

It is preferable that the bulky yarn of the present invention has excellent bulkiness, and the yarn constituting it has moderate repulsion properties. This repellency can be seen as the secondary moment of cross-section of the fiber, and in consideration of the object and effect of the present invention, it is preferable that the single yarn fineness of the constituting synthetic fiber is 3.0 dtex or more. Moreover, since deformation, such as repeated compression recovery, is applied when it is set as a packing material, it is preferable that the filaments comprised have moderate rigidity, and it is more preferable that single yarn fineness is 6.0 dtex or more. As used herein, the term "fineness" means a value calculated from the obtained fiber diameter, number of filaments, and density, or a value calculated from a simple average value obtained by measuring the weight of a unit length of a fiber multiple times. The practical upper limit of the single yarn fineness in the present invention is 50.0 dtex.

In addition, from the viewpoint of requesting a more excellent tactile feel from the bulky yarn of the present invention, the single yarn fineness ratio (second/core) of the primary yarn and the core yarn is preferably in the range of 0.5 to 2.5. If it is within this range, the fineness of the first yarn and the core yarn is close, and it can be used without feeling a foreign body feeling when compressed. Moreover, as a range in which bulky processing is possible efficiently, the single yarn fineness ratio (second/core) is 0.7-1.5, and it is more preferable at the point which makes the effect of this invention more remarkable. In addition, in the bulky yarn of the present invention, it is possible to combine various fibers, but in that the above-mentioned efficient fluid processing and no foreign body feeling when compressed, the core yarn and the super yarn are fibers having the same single yarn fineness and mechanical properties. it is preferable Specifically, in the present invention, it is preferable to prepare two or more drums of fibers produced under the same spinning conditions and use them for core and sheathing, and in particular, it is preferable that these are single fibers composed of one type (single) resin. Do.

It is preferable to have a three-dimensional crimped structure in the core yarn in addition to the core yarn from the viewpoint of reducing the friction coefficient and suppression of entanglement in such processed yarn. This means that even in the core yarn, at the intersection of the yarn that substantially fixes the sheathing, when the yarn is in a free state, the intersection is in a state where there is a void between the filaments originating from the three-dimensional crimp of the yarn. In the case of , since the loop of the sheath yarn can slide sideways in a limited space even in the direction of the fiber axis, the movable space of the sheath yarn is widened, and the effect of suppressing entanglement and soft feel of the present invention is more remarkable. On the other hand, when tension is applied to the processed yarn, the binding force at the intersection is increased by the extension of the sheath yarn, and effective effects are exerted in practical use, such as preventing loop loosening and dropping of the sheath yarn. The three-dimensional crimping of this examination can also be confirmed from the observation of examinations randomly sampled according to the three-dimensional crimping evaluation method of the first yarn described above.

The bulky processed yarn of the present invention needs to have an elastic modulus of 80 cN/dtex or less. The elastic modulus referred to herein is a stress-strain line of the processed yarn under the conditions shown in JIS L1013 (1999), the initial rise portion is linearly approximated, and obtained from the inclination. This operation was evaluated for 5 samples per level, and the simple average value of the obtained results was obtained and rounded off to two decimal places.

This modulus of elasticity represents the rigidity at the time of elongation deformation of the processed yarn, and when this value is too high, it means that the processed yarn is difficult to stretch and deform flexibly. On the other hand, if the elastic modulus is 80 cN / dtex or less, the processed yarn means that it can be flexibly deformed while having an appropriate resistance to initial deformation, and it means that it is excellent in operation followability, which is the object of the present invention. For example, when sewing with a jacket, it is of course desirable to change the characteristics of the sample appropriately depending on the site, but especially for areas around the elbow or knee that have a lot of movement, the elastic modulus is preferably 65 cN/dtex or less . Moreover, it is especially preferable to make the elasticity modulus into 55 cN/dtex or less with respect to the site|part where rigidity may become an unpleasant feeling of pressure, such as around a neck and a trunk|drum. The practical lower limit of the elastic modulus in the present invention is 10 cN/dtex.

In addition, as an important requirement for achieving the object of the present invention, it is important that the elongation recovery rate at the time of 10% elongation of the processed yarn is 50% or more. The elongation recovery rate as used herein can be evaluated with a tensile tester used also for evaluating the above-mentioned modulus of elasticity. That is, the processed yarn is stretched by 10% under the conditions of a sample length of 20 cm and a tensile rate of 100%/min using a tensile tester, then left for 1 minute and restored to the original sample length at the same speed. This operation is repeated 10 times, the stress-strain curve at this time is recorded, the length (S0) at 10% elongation and the length (S1) when the stress becomes 0 are obtained, and the elongation recovery rate is calculated by the following formula save This operation is evaluated for 5 samples per level, and the simple average value of the obtained results is obtained by rounding off the first decimal place.

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

[S0: length at 10% elongation, S1: length when stress becomes zero].

The bulky yarn of the present invention can exhibit its effects sufficiently when used particularly in a region with a lot of movement, but the fact that the elongation recovery rate is 50% or more means that the elastic properties and settling resistance are excellent during repeated elongation recovery. In the application in which the bulky processed yarn of the present invention is used, the strain given repeatedly is 10% or less, and it is preferable that it is excellent in the elongation recovery rate in this strain. If this point of view is promoted, the higher the elongation recovery rate referred to herein, the closer to rubber elastic deformation, and the material exhibits excellent stretch properties, and the practical upper limit in the present invention is 100%. When the bulky yarn of the present invention is used for general medical applications such as inners and outers, or for bedding such as futons and pillows, it is preferable that the elongation recovery rate is 55% or more. In addition, it is particularly preferable that the kidney recovery rate is 70% or more in sports and medical applications where the use conditions are relatively harsh.

The bulky yarn of the present invention preferably has a breaking strength of 0.5 to 10.0 cN/dtex and an elongation of 5 to 700%. The strength referred to here is the value obtained by obtaining the load-elongation curve of the processed yarn under the conditions indicated by JIS L1013 (1999), and dividing the load value at break by the initial fineness, and elongation is the elongation at break of the initial sample length. is the value divided by In addition, the breaking strength of the bulky yarn of the present invention is preferably 0.5 cN/dtex or more in order to be able to withstand high-order processing process passability and practical use, and the upper limit that can be implemented is 10.0 cN/dtex. In addition, considering the elongation as well as the passability of the post-processing step, it is preferably 5% or more, and the upper limit that can be implemented is 700%. Breaking strength and elongation can be adjusted by controlling the conditions in the manufacturing process according to the intended use. When the bulky yarn of the present invention is used for general medical applications such as inners and outers or for bedding such as futons and pillows, it is preferable that the breaking strength be 0.5 to 4.0 cN/dtex. In addition, it is preferable that the breaking strength be 1.0 to 6.0 cN/dtex in sports and medical applications, etc. where the use conditions are relatively severe.

The bulky yarn of the present invention has stretch properties, and as a result of intensive studies by the present inventors in order to express the stretch properties not previously found, it was found that comfortable stretch properties were expressed in the bulky processed yarn after processing by adjusting the characteristics of the core yarn. . As a requirement for expressing this stretchability, if the core yarn is excellent in elongation recovery, it is expressed in principle, but in order to achieve the object of the present invention, it is preferable to generate an intersection point of the core yarn and the yarn yarn to the extent that a loop is formed, and bulky It becomes a valuable requirement also from a viewpoint of settling prevention of a processing thread. As a result of intensive studies under this point of view, the fiber used for the screening of the present invention is a side-by-side type or an eccentric core-sheath type from the viewpoint that the processed yarn has good openability and forms a necessary junction point in the processing described later. It is preferably a composite fiber of

As exemplified in Fig. 4(4-1), the side-by-side type composite fiber refers to polymer A (7 in Fig. 4) and polymer B (7 in Fig. 4) having different properties in the fiber cross section in the direction perpendicular to the fiber axis. 8) of FIG. 4 means a fiber having a bonded form. In addition, as illustrated in Fig. 4 (4-2), the eccentric core-sheath type composite fiber is a polymer A (Fig. 4 (4-2)) on either side of the left and right from the center of gravity in the fiber cross section in the direction perpendicular to the fiber axis. 7) is arranged, and means a fiber having a form in which B-polymer (8 in FIG. 4(4-2)) is arranged to cover it.

Any of these fibers exhibits a difference in shrinkage between polymer A and polymer B and crimping according to the fiber diameter. This crimping expresses the stretch performance of the present invention. The crimps expressed by the composite fibers are roughly on the order of micrometers, and thus a good anchoring point is formed for self-supporting the loops. In the yarn stage, it is in the form of a relatively flat fiber, and it is preferable for the durability and running performance of the bulky yarn to express fine crimps after processing. Among these composite fibers, high-viscosity polyethylene terephthalate/low-viscosity polyethylene terephthalate and polybutyl The side-by-side type and eccentric core-sheath type composite fibers of renterephthalate/polyethylene terephthalate are more preferable.

In addition, in the bulky yarn of the present invention, it is possible to use the found principle to obtain a bulky yarn that has high elongation characteristics at low stress and exhibits settling resistance, that is, high stability. In this case, it is preferable to use an elastic yarn as the core core. Here, as an elastic yarn used for core core, the fiber containing at least polytrimethylene terephthalate, a polybutylene terephthalate copolymer, and a thermoplastic polyurethane as a main component is mentioned. In particular, when worn in the stretched state, it is more preferable to use a fiber made of a thermoplastic polyurethane or polyester elastomer in consideration of handling properties, from the viewpoint of obtaining a soft feel with as little tightening as possible due to wearing comfort. .

The characteristic of being excellent in the elongation characteristic in this low stress can be evaluated by the stress in 10% modulus. That is, the 10% modulus indicates the stiffness when a 10% strain is applied to the fiber, and a lower value means that the fiber can be flexibly deformed from the beginning. For this reason, in the bulky yarn of this invention, it is preferable that this 10% modulus is less than 1.5 cN/dtex as an index|index to deform|transform flexibly.

The 10% modulus as used herein is the stress when a 10% elongational strain is applied, and the stress-strain curve of the bulky yarn is obtained under the conditions shown in JIS L1013 (1999), and the load when a 10% strain is applied. It is calculated by dividing by the fineness of the examination, and this operation is evaluated for 5 samples for each level, and the simple average of the results obtained is calculated by rounding off the second decimal place.

If the 10% modulus is high, it means that the bulky yarn is difficult to flexibly elongate and deform, and if the stress is less than 1.5 cN/dtex, the bulky yarn can be flexibly deformed from the initial deformation. For this reason, when applied to clothes or the like, unpleasant sensations such as a feeling of pressure or holding on to the comfort are reduced, and especially when applied to the part of the elbow or knee where the feeling of holding is felt, very comfortable comfort is obtained. From the viewpoint of extensibility at this low stress, it is preferable that the stress required for tensile deformation is low, more preferably less than 1.0 cN/dtex, still more preferably less than 0.5 cN/dtex. A practical lower limit as a 10% modulus in the present invention is 0.1 cN/dtex.

From the object of the present invention, for example, when designing a jacket or the like, it is preferable to change the characteristics of the bulky yarn according to the site. In the case of the prior art, this characteristic change was at best adjusted by the amount of filling, etc., but in this case, especially around the neck, sleeves, and elbows, it is possible to suppress the unpleasant pressure caused by the stress caused by the elongation of the material, while maintaining the thermal effect. In order to improve, it was not made|formed to make packing property and fitting property compatible. On the other hand, with respect to the bulky yarn of the present invention, it is possible to adjust it by appropriately changing the characteristics of the core, and it is possible to manufacture a bulky yarn having an extensibility suitable for each site by the manufacturing method described later. It becomes possible to sew the product.

Moreover, in order to make the extensibility under low stress conspicuous, it is preferable that the fiber elongation ratio at the time of applying a load is 1.1 or more, and that the fiber length recovery rate is 80 to 100%.

The fiber elongation ratio at the time of load application can be calculated from the change in the sample length before and after applying a load and stretching by applying a predetermined load to the sample taken at a specific length. That is, 5 m of bulky yarn is collected with a spool of 1 m/perimeter, one end of the spool is hung and the original length (L0) before load application elongation is measured by applying an initial load of 0.03 cN/dtex per sample fineness. Next, the initial load is removed, an extension load of 1.5 cN/dtex per sample fineness is applied, and the sample length (L1) at the time of extension under load is measured, and the fiber elongation ratio upon application of load is obtained by the following formula. . The operation was evaluated for 5 samples per level, and the simple average value of the obtained results was obtained and rounded off to two decimal places.

Elongation ratio under load = L1/L0

[L0: original length before extension under load (cm), L1: length upon extension under load (cm)].

After removing the elongation load following the measurement of the elongation ratio during load application, the above-mentioned initial load is applied to measure the sample length (L2) after elongation under load, and the fiber length recovery rate after elongation under load is obtained by the following equation. The operation was evaluated for 5 samples per level, and the simple average value of the obtained results was obtained and rounded off to the first decimal place.

Fiber length recovery rate after load extension (%)=(L1-L2)/(L1-L0)×100

[L0: original length before extension under load (cm), L1: length upon extension under load (cm), L2: length after extension under load (cm)].

When the load application elongation ratio is 1.1 or more, it means that the processed yarn is highly elongated, and when the fiber length recovery ratio is 80% or more, it means that it is excellent in shape recovery after stretching, that is, in settling resistance. That is, the higher the load-applied elongation ratio and the higher fiber length recovery rate, the more the bulky yarn is deformed close to the elastic deformation of rubber, and it means that it is suitable for use in which a relatively high degree of elongation deformation or repeated elongation recovery is repeated. For this reason, for example, when processed yarn having the characteristics of this range is used for medical care, it is suitable for use in areas subjected to repeated stretch recovery such as elbows and knees, and does not feel stress due to braces, etc. Since the deformation is almost completely recovered, mold breakage etc. do not occur. In addition, when combined with a stretchy geodesic, it is also possible to make it into clothes that fit the body. In this case, it is possible to secure a high degree of thermal insulation due to adhesiveness, and since the clothing is flexibly deformed according to an individual's physique, various people can comfortably wear it with one size or a sewing pattern.

In addition, in order to apply the bulky yarn of the present invention to general medical uses such as inners and outers, pajamas, medical for the sick and pregnant women, etc. to minimize the tightening feeling as much as possible and to request a soft feel, the load application elongation ratio is 1.5 or more. It is more preferable, More preferably, it is 2.0 or more. Further, when used as a material excellent in shape recovery properties that it recovers to its original shape even after compact storage, the fiber length recovery ratio after load application is more preferably 90% or more, and still more preferably 95% or more.

In these elongation characteristics, since the upper limit is the state in which the bulky yarns are fully stretched, the practical upper limit of the load application stretch ratio in the present invention is 20.0.

The fiber used in the present invention is preferably a hollow cotton fiber. This is an advantage of the manufacturing method described later. In addition to the fact that the three-dimensional crimp size of millimeter order, which is a preferred form of the super yarn, can be relatively freely controlled from large size to small size, it is preferable from the viewpoint of independence of the loop. Do. That is, in the bulky yarn of the present invention, the self-supporting loop made of the sheath yarn is responsible for the bulky property. The self-reliance of the super yarn is made possible by the stiffness of the super yarn, starting from the point of intersection with the examination, but considering the settling resistance and the like, it is preferable that the weight of the first yarn is also light. For this reason, specifically, it is preferable that the density (weight per unit volume) of the sheath yarn is lower, and hollow fiber cotton is preferably used. From the viewpoint of the lightness of this sheath yarn, it is more preferable that it is a hollow cotton fiber having a hollow ratio of 20% or more. The hollow ratio referred to herein is two-dimensionally photographed at a magnification for observing 10 or more fibers with an electron microscope (SEM) after cutting the hollow cross-section fiber. Ten fibers selected at random from the photographed image are extracted, and the area of the fibers and hollow parts is measured using image processing software to obtain the area ratio. All of the above values were measured for each image at 10 locations, and the average value of the 10 images was taken as the hollow ratio of the hollow cotton fiber of the present invention. In addition, in order to evaluate this hollow ratio simply, the fiber side is observed with a microscope etc., and the fiber diameter in conversion of a circular cross section is measured from the image. It is also possible to calculate the hollow ratio by evaluating the ratio of the measured fineness (measured weight) to the fineness (converted weight) converted as solid fibers from the fiber diameter.

It is preferable that the bulky yarn has an air layer more, and it is especially preferable that the hollow ratio is 30 % or more from a viewpoint of the light weight and heat retention which is the objective of this invention, as for the hollow ratio here. If it is such a range, better lightness can be realized when the processed yarn is bundled, and since it means that it has an air layer with a lower thermal conductivity, it is excellent also in heat retention. The practical upper limit of the hollow ratio in this invention is 50 %.

It is preferable that the primary yarn of the bulky yarn of the present invention has a density of less than 1.00 g/cm 3 . The density of the sheath yarn as used herein is the weight per unit volume of the sheath yarn, and is measured using a density gradient tube by a method according to JIS L 1013:2010. When the density of the sheath yarn is within this range, when it is used as a filling cotton for clothes, bedding, etc., it becomes a product rich in light weight, and it becomes a thing with high comfort at the time of use. From the viewpoint of improving the lightness of the bulky yarn, the density of the primary yarn is more preferably 0.95 g/cm 3 or less, and more preferably 0.90 g/cm 3 or less.

In addition, in order to impart lightness and mechanical properties and to obtain a bulky yarn that has no repulsion in the prior art, it is preferable that the fiber used for the first yarn is a sea-island composite fiber having a hollow cross-section. The sea-island composite fiber as used herein is a composite fiber having a cross-sectional structure in which an island component composed of a predetermined polymer is dotted in a sea component composed of the other polymer. As an example of the sea-island composite fiber having a hollow cross-section, as shown in FIG. 5, a donut-shaped sea-island composite fiber having a hollow portion 9 in the center of the fiber cross-section and dotted with island components 10 in the sea component 11 is prepared. can be heard

As described above, since the hollow part in the center of the fiber cross-section contains air, heat retention is obtained by exhibiting an insulating effect by the air layer included in the hollow part as well as lightness. In addition, due to the sea-island structure around the hollow part, the island component scattered in the sea component disperses the impact against the impact such as compression or bending on the bulky yarn, thereby maintaining the flexibility of the primary yarn and reinforcing it. The settling that may have occurred is greatly improved, resulting in a bulky yarn with rich repulsion properties.

The combination of the polymer used for the island component and the sea component of the sea-island composite fiber can be appropriately selected from the above polymer group, but it can promote the weight reduction of the bulky yarn and can sufficiently withstand use as a textile product. From the viewpoint of imparting physical properties, it is preferable that the island component is polyolefin and the sea component is polyester. Since polyolefin has a low density, sea-island composite fibers are rich in lightness when used for island components. In addition, by using the sea component as polyester, physical properties such as the elongation of the sea-island composite fiber can be made suitable for textile products, and since the sea component serving as the matrix of the sea-island conjugate fiber has crystallinity, deterioration in processing and use and settling It becomes a thing with high tolerance with respect to a ring. In this case, from the viewpoint of imparting sufficient characteristics when using the sea-island composite fiber as a textile product, it is preferable that the composite ratio of the island/sea is 50/50 to 10/90. In addition, from the viewpoint of improving the lightness of the sea-island composite fiber by increasing the low-density polyolefin ratio of the island component, the island/sea composite ratio is more preferably 50/50 to 20/80, and 50/50 to 30/70. more preferably.

The bulky yarn of the present invention can be made into various fiber structures such as a fiber winding package, tow, cut fiber, cotton, fiber ball, cord, pile, woven knitted fabric, nonwoven fabric, and the like, and can be made into various fiber products. Textile products referred to here include general medical, sports medicine, medical materials, interior products such as carpets, sofas, and curtains, interior products such as car seats, cosmetics, cosmetic masks, wiping cloths, health products, etc. It can be used for environmental and industrial material applications such as material removal products. In particular, the bulky yarn of the present invention is preferably used as a cotton pad from the effect of suppressing its bulkiness and entanglement. In this case, in order to fill the side paper, it is good to use a method of forming a bundle of several to tens or a sheet-like material such as a nonwoven fabric. In particular, when forming into a sheet, filling to a side paper is easy, and it is easy to adjust a filling amount according to a use. For this reason, it becomes a lightweight and thermal insulation material of thin fabric, and there is no worry about slipping out from the side ground, and since there is no need to perform unnecessary sewing, there are no restrictions on the form of textile products, and complicated designs etc. are possible.

An example of the manufacturing method of the bulky yarn of this invention is demonstrated in detail below.

For the core yarn and yarn yarn used in the present invention, a synthetic fiber obtained by forming a thermoplastic polymer into a fiber by a melt spinning method may be used.

The spinning temperature at the time of spinning the synthetic fiber used in the present invention is a temperature at which the polymer to be used exhibits fluidity. The temperature at which this fluidity is exhibited varies depending on the molecular weight, but the melting point of the polymer is the target, and it is good to set the melting point to +60°C or less. If it is less than this, the polymer is not thermally decomposed in the spinning head or the spinning pack, and molecular weight reduction is suppressed, which is preferable. In addition, the discharge amount is a range that can discharge stably, and is 0.1 g/min/hole to 20.0 g/min/hole per discharge hole. At this time, it is preferable to consider the pressure loss in the discharge hole that can ensure the stability of the discharge. The pressure loss referred to here is aimed at 0.1 MPa to 40 MPa, and it is preferable to determine the discharge amount from this range from the relationship between the melt viscosity of the polymer, the discharge hole diameter, and the discharge hole length.

The molten polymer discharged in this way is cooled and solidified, is given an oil agent, and is taken over by a roller with a prescribed peripheral speed to become a synthetic fiber. Here, the take-up speed may be determined from the discharge amount and the target fiber diameter, but in order to manufacture stably, it is preferable to set it as the range of 100-7000 m/min. From the viewpoint of improving the mechanical properties by making this synthetic fiber highly oriented, it may be stretched after being wound up, or it may be stretched continuously without being wound up once. As this drawing condition, for example, in a drawing machine comprising one or more pairs of rollers, if it is a fiber made of a polymer representing a synthetic fiber that can generally be melt-spun, the first roller set at a temperature above the glass transition temperature and below the melting point, and the crystallization temperature. According to the circumferential speed ratio of the second roller, it is stretched without unreasonableness in the direction of the fiber axis, and is then heat-set and wound up. In the case of a polymer that does not exhibit a glass transition, the dynamic viscoelasticity measurement (tanδ) of the composite fiber may be performed, and a temperature equal to or higher than the peak temperature on the high temperature side of the obtained tanδ may be selected as the preheating temperature. Here, it is also a preferable means to implement this extending|stretching process in multiple steps from a viewpoint of raising a draw ratio and improving a mechanical property.

The cross-sectional shape of the synthetic fiber of the present invention does not need to be particularly limited, and by changing the shape of the discharge hole in the spinneret, a general round cross-section, triangular cross-section, Y-shaped, 8-lobed, flat, etc. or various types can be obtained. It is possible to set it as an irregular shape, such as a hollow shape. Moreover, it is not necessary to be a single polymer, and the composite fiber which consists of two or more types of polymers may be sufficient. However, from the viewpoint of expressing the three-dimensional crimping of the super yarn, which is an important requirement of the present invention, it is appropriate to use a side-by-side composite fiber in which two types of polymers are joined. That is, these fibers are characterized in that they exhibit three-dimensional crimping from structural differences in the cross-sectional direction by performing heat treatment after spinning and yarn processing. For this reason, although it is a so-called straight fiber at the time of fluid processing mentioned later, three-dimensional crimping is expressed by heat-processing after the loop forming process by the sheathing. If the fibers are straight during bulky processing, it is easy for the yarn to run stably without causing clogging of the threads in nozzles, etc. Also, in forming the loop of the present invention, the core yarn and the primary yarn turn efficiently, and the loop is formed very homogeneously in the fiber axis direction of the processed yarn. By heat-treating the processed yarn with this loop formed on the outer layer aiming at the crystallization temperature of the polymer using the processed yarn, the super yarn develops three-dimensional crimping and becomes the bulky yarn of the present invention.

The three-dimensional crimping of this super yarn is to express good bulkiness in both the circumferential direction and the cross-sectional direction of the processed yarn, and it is preferable to appropriately control it according to the required characteristics. From the viewpoint of controlling the appearance of crimp after this heat treatment, the fiber used in the present invention is more preferably a hollow fiber cotton fiber. In the case of a hollow cotton fiber, it has an air layer with low thermal conductivity at the center of the fiber. For this reason, for example, after discharging from a spinneret capable of forming a hollow cross-section, one side is forcibly cooled with an excessive cooling wind or the like, or one side is excessively heat-treated with a heating roller or the like during stretching in the cross-sectional direction of the fiber. Structural differences arise in In the case of hollow cotton fibers, in addition to being able to be spun by a single spinning machine, the size of the three-dimensional crimp by the above operation can be controlled relatively freely from a large size to a small size. For this reason, it is preferable for use in the present invention, and from the viewpoint of crimping control by the above-described operation, it is more preferable that the fiber is a hollow fiber with a hollow ratio of 20% or more, and it is particularly preferable that it is a hollow fiber with a hollow ratio of 30% or more. .

The bulky yarn of the present invention supplies a prescribed amount of the above-mentioned core (20 in FIG. 6) and first yarn (21 in FIG. 6) by a supply roller (19 in FIG. 6) having a nip roller and the like, and compressed air can be sprayed. The first step is to suck the core yarn and the first yarn by the suction nozzle (12 in Fig. 6).

In this suction nozzle (12 in Fig. 6), the flow rate of compressed air injected from the nozzle has the minimum tension required for the thread inserted into the nozzle from the supply roller, so that the thread does not shake between the supply roller and the nozzle and within the nozzle. It is good to spray the flow rate that runs stably. Although the optimal amount of this compressed air flow rate changes depending on the hole diameter of the suction nozzle to be used, as a range in which thread tension can be applied and the formation of a loop to be described later can be made smoothly, the airflow velocity in the nozzle is 100 m Anything greater than /s is the target. The target of the upper limit of this airflow speed is to be 700 m/s or less, and if it is within this range, the traveling thread does not cause yarn shake etc. by excessively injected compressed air, and travels in the nozzle stably.

In addition, from the viewpoint of preventing disturbance and opening in this nozzle, it is preferable to set the compressed air injection angle (22 in Fig. 7) to a propelling jet stream that is injected less than 60° with respect to the running thread, and with high productivity. , it is preferable from the viewpoint of uniformly forming loops by weaving. Naturally, it is not impossible to manufacture the bulky yarn of the present invention even for processing by a vertical jet stream that sprays a fluid at 90° to the running thread, but opening of the running thread by jet flow from the vertical direction, and narrow space in the nozzle From the viewpoint of suppressing entanglement between single yarns, processing by a propelling jet is preferable. The processing by this propulsion jet stream can also suppress the formation of an arcuate small loop, which is easy to form in the case of a vertical jet, in a short period.

It is preferable not to disturb or open the loop in the suction nozzle in the formation of the loop made of the sheath yarn necessary for the bulky yarn of the present invention. From the viewpoint of allowing the multifilaments composed of several to several tens of yarns to travel within the nozzle without opening them, it is more preferable that the compressed air injection angle is 45° or less with respect to the traveling yarn. In addition, in order to form a loop outside the nozzle, which will be described later, it is preferable that the injection airflow immediately after the nozzle have high stability and driving force, and from this point of view, it is particularly preferable that the injection angle is 20° or less with respect to the running thread.

Next, the process of turning the thread sucked by the suction nozzle out of the nozzle to form a loop by the weft thread becomes the second process of the present invention.

Although the thread guided by this suction nozzle may be performed by one feed and by two feeds, in order to manufacture the bulky yarn of this invention, it is preferable to perform processing by two feeds. The term "two-feed" as used herein means a method in which two or more yarns are fed to the nozzle by giving a difference in the feed speed (quantity) to the feed roller or the like in advance, and by using the turning force by the air flow to be described later, the yarn ( ) will form a bulky structure with loops formed on the outer layer. In the case of utilizing this two-feed, it is not impossible to manufacture yarns with loops in interlaced nozzles or taslan processing nozzles, which impart the effects of disturbance, opening and entanglement to the running thread within the nozzle. However, in the yarn processed with these processing nozzles, in addition to forming a loop in a short period, the size also becomes small. For this reason, in order to manufacture the bulky yarn which satisfy|fills the objective of this invention, it is necessary to precisely control the parameter which exists many, and it is very difficult. In addition, since there is a possibility that the bulkiness of the processed yarn is different for each spindle in the case of multiple spindles, it is preferable to adopt a method utilizing the control of the airflow outside the nozzle, which will be described later, also from the viewpoint of quality stability. In this regard, the control of the airflow injected from the nozzle is based on the concept that a loop can be formed by rotating the two yarns supplied from a position away from the nozzle without providing any disturbance or opening treatment in the nozzle. As a result of earnest examination from the viewpoint of doing, when the ratio of airflow speed and yarn speed (airflow speed/yarn speed) was in the range of 100 to 3000, we discovered a specific phenomenon that the first sand turns while opening the island.

The airflow speed here refers to the speed of the airflow sprayed from the downstream side of the suction nozzle along with the running thread, and can be controlled by the nozzle's discharge diameter and the flow rate of compressed air. In addition, the yarn speed can be controlled by, for example, the running speed of a roller that takes over the working yarn after the fluid processing nozzle. Since the turning force of this running thread increases or decreases depending on the speed ratio of the airflow and the yarn, when the target bulky yarn intersection point is to be strengthened, the speed ratio can be made close to 3000, and it is desired to soften the intersection point. In this case, on the contrary, it should be close to 100 This speed ratio can also be made to give a change in the degree of intersection by changing the flow rate of compressed air intermittently, or changing the speed of a take-up roller, for example. On the other hand, when the bulky yarn of the present invention is used for applications to which deformation of compression recovery of repeated repetitions, such as packing, is imparted, it is preferable that the air flow rate/yarn velocity be 200 to 2000. In particular, when manufacturing processed yarn used for medical purposes, such as a jacket to which deformation is applied at high frequency, it is particularly preferable that the airflow velocity/yarn velocity be 400 to 1500 from the viewpoint of imparting appropriate restraint and flexibility.

The turning point (13 in Fig. 6) serving as the starting point at which this turning force is expressed is started by separating the traveling thread from the accompanying airflow. Specifically, it is better to change the direction with a bar guide or the like, and the first person turns around the examination by taking over the running thread at a prescribed speed by the take-over roller (15 in Fig. 6) in the traveling direction of the running thread, form a loop It is preferable that the turning point of the traveling thread is located at a position away from the nozzle discharge port from the viewpoint of obtaining loosening by vibration of the primary yarn using the space for causing this rotation and diffusion of the air flow injected from the nozzle. However, in order to manufacture the bulky yarn of the present invention, the distance between the nozzle and the turning point is changed according to the blown airflow speed, and the blowout airflow turns during running for 1.0×10 ⁻⁵ sec to 1.0×10 ⁻³ sec. It is preferred that the point (13 in Fig. 6) is present. In order to form the intersection point of the core and the top yarn at an appropriate period in balance with the diffusion of the air flow, the distance between the nozzle and the turning point should exist while the ^{jet air flow travels for 2.0×10 -5} sec to 5.0×10 ^{-4 sec.} more preferably.

By adjusting this turning point, the period of the intersection point of the bulky yarn of the present invention can also be controlled. The junction has a role of supporting the independence of the loop made of the sheath yarn, which is a feature of the present invention, and it is preferable to exist at a certain period. From this point of view, it is preferable to adjust the turning point so that the intersection point of the core yarn and the first yarn in the bulky yarn is 1/mm to 30 pieces/mm. If it is within this range, even after the three-dimensional crimp of the super yarn is expressed, it is preferable because loops exist with an appropriate interval. Promoting this point of view, it is more preferable to adjust the turning point so that the abutment points are 5 to 15 pieces/mm.

The processed yarn (14 in Fig. 6) in which the loop formed of the super yarn is formed is preferably subjected to heat treatment after being wound up once or continuously in bulky processing in order to achieve shape fixation or three-dimensional crimping. In Fig. 6, a processing step of performing heat treatment following the loop forming step is exemplified.

This heat treatment (16 in Fig. 6) is performed by heating the processed sand with a heater or the like, and the target processing temperature is the crystallization temperature of the polymer to be used ±30°C. In the case of treatment in this temperature range, since the treatment temperature is away from the melting point of the polymer, there is no fusion and hardening between the first yarns and the yarns, and there is no sense of foreign matter, so that the good feel of the bulky yarn of the present invention is not impaired. As the heater used in this heat treatment step, a general contact or non-contact heater can be employed, but from the viewpoint of suppressing the deterioration of bulkiness and yarn yarn before heat treatment, a non-contact heater is preferably employed. The non-contact heater as used herein includes air heating type heaters such as slit type heaters and tube type heaters, steam heaters heated by high-temperature steam, halogen heaters and carbon heaters using radiant heating, microwave heaters, and the like.

Here, from the viewpoint of heating efficiency, a heater using radiant heating is preferable. As for the heating time, for example, crystallization proceeds and the time required for fixing the fiber structure of the fibers constituting the processed yarn, fixing the shape of the processed yarn, and completing the crimping of the primary yarn is the target, and the processing temperature and time required It is preferable to adjust according to the characteristic. After the heat treatment process has been completed, the processing yarn may regulate the speed through the delivery roller (17 in FIG. 6) and group it with a winder having a tension control function (18 in FIG. 6). It does not specifically limit about this winding-up shape, It is possible to set it as so-called cheese winding and bobbin winding. In addition, in consideration of processing to a final product, a plurality of pieces are braided in advance to form a tow, or it is also possible to form a sheet as it is.

The bulky yarn of the present invention is preferably to uniformly adhere the silicone-based oil agent before and after the heat treatment process. The silicone to be adhered here may be heat-treated or appropriately crosslinked to form a silicone film on the first and second yarns. The silicone-based oil agent referred to herein includes dimethylpolysiloxane, hydrodienemethylpolysiloxane, aminopolysiloxane, epoxypolysiloxane, and the like, and may be used alone or by mixing them. Further, from the viewpoint of uniformly forming a film on the bulky yarn, it is possible to contain a dispersant, a viscosity modifier, a crosslinking accelerator, an antioxidant, a flame retardant and an antistatic agent within a range that does not impair the purpose of silicone adhesion. Although this silicone-based oil agent may be a straight one, it may be used as an aqueous emulsion, but from the viewpoint of uniform adhesion of the oil agent, it is preferably used as an aqueous emulsion. It is preferable to treat the silicone-based emulsion so that 0.1 to 5.0 wt% can be adhered to the bulky yarn in a mass ratio using an oil agent guide, an oiling roller, or dispersion by spraying. After that, drying at an arbitrary temperature and time, and crosslinking reaction is preferred. This silicone-based oil agent can be applied in a plurality of times, and it is also preferable to laminate a strong silicone film by dividing and attaching the same type of silicone or different types of silicone. By forming the silicone film on the bulky yarn by the above treatment, the sliding properties and the feel of the bulky yarn are increased, and the effect of the present invention can be further emphasized.

(Example)

Hereinafter, the bulky yarn of the present invention will be described in detail with reference to Examples.

The following evaluation was performed about an Example and a comparative example.

A. Fineness

The fineness was computed by measuring the weight of 100 m of fibers, and multiplying it 100 times. This was repeated 10 times, and the value obtained by rounding off the second decimal place of the simple average value was used as the fineness of the fiber. The single yarn fineness was calculated by dividing the above-mentioned fineness by the number of filaments constituting the fiber. Also in this case, the value obtained by rounding off the second decimal place was made into single yarn fineness.

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

The stress-strain line is measured for the fiber under the conditions of a sample length of 20 cm and a tensile rate of 100%/min using a tensile tester, Tensilon UCT-100, manufactured by Orientec Corporation. The load at break was read, and the strength was calculated by dividing the load by the initial fineness. In addition, the elastic modulus was obtained by linear approximation of the initial rising part of the stress-strain line, and the slope. The 10% modulus was calculated by reading the load of 10% strain and dividing by the initial fineness. In any value, this operation is evaluated for 5 samples per level, the simple average of the obtained results is obtained, the strength and elastic modulus are rounded to the first decimal place, and the 10% modulus is the value obtained by rounding off the second decimal place.

C. Fiber elongation recovery rate at 10% elongation

After stretching the fiber by 10% under the conditions of a sample length of 20 cm and a tensile rate of 100%/min using Tensilon UCT-100, a tensile tester made by Orientec Co., Ltd., it was left for 1 minute, and the original sample length was positioned at the same speed. recover up to This operation was repeated 10 times, the stress-strain curve at this time was recorded, the length at 10% elongation (S0) and the length when the stress became 0 (S1) were obtained, and the elongation recovery rate was obtained by the following formula . The operation was evaluated for 5 samples per level, and the simple average value of the obtained results was obtained and rounded off to the first decimal place.

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

[S0: length at 10% elongation, S1: length when stress becomes zero].

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

5m of the fiber is taken with a spool of 1m/circumference, and one end of the spool is hung, and an initial load of 0.03cN/dtex is hung on the spool, and the original length (L0) is measured. Next, the initial load was removed, a load of 1.5 cN/dtex was hung and left to stand for 1 minute, the sample length (L1) at the time of extension under load was measured, and the fiber elongation ratio at the time of load application was calculated by the following formula. The operation was evaluated for 5 samples for 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 set as the load-applied extension ratio.

Load extension ratio = L1/L0

[L0: original length before extension under load (cm), L1: length upon extension under load (cm)].

In addition, following the measurement of the applied extension ratio, after removing the extension load, the same 0.03 cN/dtex as the initial load was hung on the spool, and the sample length (L2) after the load was measured, and the fiber length recovery rate was obtained by the following formula. Also in this case, the same operation was evaluated for 5 samples per level, the simple average value of the obtained results was obtained, and the value obtained by rounding off the first decimal place was used as the fiber length recovery rate.

Fiber length recovery rate after load extension (%)=(L1-L2)/(L1-L0)×100

[L0: original length before extension under load (cm), L1: length upon extension under load (cm), L2: length after extension under load (cm)].

E. Density

The density of the fibers was measured using a density gradient tube in accordance with JIS L 1013:2010. After the sample reached the equilibrium position in the liquid and stopped, the sedimentation depth of the sample was read from the scale of the density gradient tube to 1 mm, and the density was determined by comparing the numerical value with the calibration curve. This was performed twice for every level, the simple average value of the obtained result was calculated|required, and the value which rounded off the third decimal place was made into density.

F. Loop evaluation (size, number, break)

A load of 0.01 cN/dtex is applied so that the processed yarn does not become loose, and the yarn is hung on a pair of yarn guides at a regular length as illustrated in FIG. 2 . The side of the thread-hung yarn was photographed at a magnification so that the entire loop could be observed with a microscope VHX-2000 manufactured by Giens Co., Ltd. The distance (5 in FIG. 2) of the loop front end from the seal surface was evaluated using image processing software (WINROOF) about 10 places randomly selected from this image. This operation is performed for a total of 10 images, and a total of 100 places is measured to the first decimal place in millimeter units. The average value of these numerical values was computed, and the value which rounded off the second decimal place was made into the loop size (protrusion) in this invention.

For the same 10 images, the breaking points of the loop tip and the first yarn per unit distance were counted, and the number of loops per millimeter and the breaking points were evaluated. The same operation was performed for 10 images, and the value obtained by rounding off the average value to the nearest decimal point was evaluated as the number of loops. In addition, about the breaking point of a loop, it was set as the breaking point of a loop by averaging the breaking points of the counted loop, and rounding off the second decimal place. Here, a sample having a break point of less than 0.2 pieces/mm was evaluated as having a continuous loop as referred to in the present invention, and a sample having no breakage (evaluation: A) and a sample having a break point of 0.2 pieces/mm or more was evaluated as having breakage (evaluation: C). .

G. Crimp shape evaluation (three-dimensional crimping, radius of curvature)

In 10 places randomly selected from the processing yarn, 10 or more single yarns were sampled, respectively, and each single yarn was observed at a magnification capable of confirming the crimped form with a Microscope VHX-2000 manufactured by Giens Co., Ltd. When the single yarn observed in this image had a form in which the single yarn turned spirally, it was judged as having a three-dimensional crimped structure (evaluation: A), and in the case of a straight form, it was determined as having no crimping structure (evaluation: C). . In addition, from the same image, using image processing software (WINROOF), the radius of the perfect circle most inscribed at two or more places in the curvature of the crimped fiber (6 in Fig. 3) was evaluated. As described above, a total of 100 single yarns randomly extracted were measured to the second decimal place in millimeters, and the value obtained by rounding off the second decimal place of this simple average was taken as the radius of curvature of the three-dimensional crimped structure of the present invention.

H. Coefficient of static friction between fibers

It is measured by the method according to JIS L 1015 (2010) with a radar type friction coefficient tester. In addition, the evaluation of the coefficient of static friction between fibers is evaluated by arranging the processed yarn parallel to the cylinder.

I. Haeseong (inhibitory effect of fastener phenomenon)

A drum in which the processed yarn is wound over 500 m is installed on the creel, released at a speed of 30 m/min in the cross-sectional direction of the drum for 5 minutes, and the shaking and jamming of the yarn due to the fastener phenomenon is visually checked, and evaluated in the following 4 steps did.

S: The fluctuation|fluctuation of a yarn is not seen, but it can make it favorable.

A: There is a slight fluctuation of the yarn, but it can be done without any problem.

B: You can see the yarn fluctuating and some jamming, but it can be done.

C: It cannot be done because the yarn fluctuates and jams.

J. Tactile

The drum in which the processed sand was wound 500m or more was installed on the creel, and it was set as the spool of 10m by threading using the checker in the cross-sectional direction of the drum, and setting it as a winding form. One location of the spool was fixed, and the sample for tactile evaluation was created. The tactile sensation when holding this sample was evaluated in the following four steps.

S: It is excellent in bulkiness and flexibility, and the excellent touch which does not feel a foreign body feeling.

A: Good touch with bulkiness and flexibility.

B: It has bulkiness, and the good touch of the grade which does not feel a foreign body feeling.

C: There is no bulkiness, and the bad touch which feels a foreign material feeling.

K. Bulky Assessment

20 g of processed yarn is filled in a cylindrical container with an inner diameter of 28.8 cm and a height of 50.0 cm, and the height H (cm) of the space occupied by the processed yarn when a load of 0.15 g/cm 2 is applied from the top in the vertical direction to the filled processed yarn is measured. And the bulkiness (inch ³ /20g) was computed from the following formula, and the integer value which rounded off the 1st decimal place of the value was made into the bulkiness of the processed yarn.

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

In addition, the height of each processed thread was measured by reading the height in mm unit from the scale which matched the zero point to the bottom surface of a cylindrical container.

[Example 1]

High-viscosity polyethylene terephthalate (PET1: IV=0.8 dl/g) as polymer A and low-viscosity polyethylene terephthalate (PET2: IV=0.5 dl/g) as polymer B were prepared, melted at 295° C., weighed, and combined It was introduced into a spinneret equipped with a spinneret, and discharged so as to have a side-by-side composite cross section composed of polymer A and polymer B as illustrated in Fig. 4(4-1) (composite ratio: A polymer/B polymer = 50) /50). The undrawn yarn was wound up at a spinning speed of 1500 m/min after applying a spinning oil agent after cooling and solidification by blowing a cooling wind at 20° C. to the discharged yarn by flowing at a rate of 20 m/min. A composite fiber (single yarn fineness of 7.0 dtex) obtained by stretching the wound undrawn yarn 3.0 times at a drawing speed of 800 m/min between rollers heated to 90°C and 140°C was used as an examination.

Next, polyethylene terephthalate (PET3: IV=0.6dl/g) is melted at 290°C, weighed, and introduced into a spinning pack, and three slits (width 0.1 mm, 23 in FIG. 8) as illustrated in FIG. ) was discharged so that the hollow ratio was 30% from the discharge holes for hollow surfaces arranged concentrically. Cooling wind at 20° C. was blown from one side to the discharged yarn at a flow of 30 m/min, and after cooling and solidification, a spinning emulsion was applied, and the undrawn yarn was wound up at a spinning speed of 1500 m/min. Subsequently, the hollow fiber (single yarn fineness of 6.5 dtex) which was drawn 3.0 times at a drawing speed of 800 m/min between the rollers heated to 90 degreeC and 140 degreeC of the wound undrawn yarn was made into primary yarn.

In the process illustrated in FIG. 6, core and sheathing were supplied to a suction nozzle at feed roller speeds of 50 m/min and 1000 m/min. In the suction nozzle, compressed air was sprayed at an air flow speed of 400 m/s at 20° with respect to the running thread, and ejected from the nozzle together with the accompanying air flow without bridging the core and the primary sand. ^{The yarn sprayed from the nozzle was run for 1.0×10 −4} seconds with the airflow, and the yarn direction was changed using a ceramic guide, and the processed yarn that formed a loop made of super yarn was taken over with a roller of 50 m/min. The processed yarn was continuously guided to the tube heater through a roller, and the shape of the bulky yarn was set by heat treatment for 10 seconds with heated air at 150° C., and crimping was expressed in the core yarn and the core yarn. The bulky yarn was wound on the drum at 52 m/min by a tension-controlled winder installed after the tube heater.

In Example 1, loops made of sheath yarn protrude 38.0 mm on average from the yarn surface, and the loops were bulky yarns formed in a number of 22 pieces/mm. This protruding loop was excellent in size and uniformity of period. In addition, the first yarn of the processed yarn had a three-dimensional crimped structure of millimeter order with a radius of curvature of 5.7 mm, and a continuous loop was formed in which the breaking point was not visible in the first yarn loop. (breaking point: 0.0)

Subsequently, the silicone-based emulsion containing the polysiloxane in a concentration of 8wt% in the processed yarn is uniformly dispersed with a spray so that the final polysiloxane adhesion amount is 1wt% with respect to the bulky yarn, and heat-treated at a temperature of 165° C. for 20 minutes to the bulky yarn of the present invention. was harvested

In the bulky yarn, the first yarn forming a continuous loop has a three-dimensional crimped structure, the coefficient of static friction between fibers is 0.1, and there is no problem in the knitting property of the processed yarn, and it is made from a smoothly wound drum without jamming. I could (Haesung: S). In addition, the elastic modulus indicating rigidity was 73 cN/dtex, and the elongation recovery rate was 83%, which had pleasant stretch properties (feel: S). A result is shown in Table 1.

[Example 2]

All were carried out according to Example 1 except that PET1/PET2 side-by-side composite fiber having a single yarn fineness of 3.0 dtex was used as the core by adjusting the discharge amount by the combination of the polymer used for the core examination of Example 1.

In Example 2, the number of loops was slightly increased by reducing the single yarn fineness of the core, and it was easy to deform when stretched and deformed and had a softer feel compared to Example 1. A result is shown in Table 1.

[Examples 3 and 4]

PBT/PET2 side-by-side collected by changing polymer A to polybutylene terephthalate (PBT: IV = 1.2 dl/g), spinning at a spinning temperature of 290°C, and spinning using the composite spinneret used in Example 1 All were carried out according to Example 1 except that the composite fiber was used as the core (Example 3). Moreover, the bulky yarn which made the PBT/PET2 side-by-side composite fiber with a single yarn fineness of 3.0 dtex as a core material was extract|collected by making Example 3 and the polymer combination the same, and adjusting the discharge amount (Example 4).

In Examples 3 and 4, the core showed relatively fine crimping at the yarn stage, and the number of loops decreased in the bulky processed yarn. In addition, as compared with Example 1, the elastic modulus was low, and it was very flexible and was to be elongatedly deformed at a low stress. In addition, the elongation recovery rate is greatly improved, and there is no settling even when relatively highly deformed, so it is a material suitable for use in a region with a large movable range. A result is shown in Table 1.

[Comparative Example 1]

Polyethylene terephthalate (PET3: IV = 0.6 dl/g) used for the first yarn of Example 1 was melted at 290°C, weighed, and introduced into a spinning pack, and three slits (width 0.1 mm) as illustrated in FIG. 8 . , 23) of FIG. 8 were discharged so that the hollow ratio was 30% from the discharge holes for hollow surfaces arranged concentrically. Compared with Example 1, the cooling wind at 20°C was increased (100 m/min), and the yarn was sprayed from one side from one side, and after cooling and solidification, a spinning emulsion was applied, and the undrawn yarn was wound at a spinning speed of 1500 m/min. Subsequently, all of the hollow fibers (single yarn fineness of 6.5 dtex) drawn 3.0 times at a drawing speed of 800 m/min between rollers heated to 90° C. and 140° C. carried out according to

In Comparative Example 1, although it roughly coincided with the shape characteristic of Example 1, the size of a loop was small and the number of loops fell. Although it was comparatively excellent also in unwinding property and touch, it was a thing with high elastic modulus and a fall in elongation recovery rate. A result is shown in Table 2.

[Comparative Example 2]

All were carried out according to Comparative Example 1, except that a nozzle in which the injection angle of compressed air was changed to 90° was used, and a turning point by a ceramic guide was not provided. However, in Comparative Example 2, at the same compressed air flow rate as in Comparative Example 1, the entanglement of core and sheath yarns was excessive, and nozzle clogging occurred. It was decided to evaluate the collection and characteristics of the processing yarn.

In the processed yarn of Comparative Example 2, the loop size of the primary yarn at the time before heat treatment was smaller than that of Example 1 or Comparative Example 1, and was formed in a very short period. A loop could be formed, but the bulkiness was lacking. When the details of the loop made of the primary yarn were checked, the loop size was varied, and a relatively large number of break points that could not be confirmed before the heat treatment were observed (with breakage: 0.5 pieces). A result is shown in Table 2.

[Comparative Example 3]

Using the processed yarn of Comparative Example 2, a process of untwisting the processed yarn by rubbing it with a pair of rubber disks was performed. Although the apparent bulkiness certainly seems to be improved, the breakage of the loop is further increased compared with Comparative Example 2, and entanglement between the yarns is encouraged and a feeling of foreign body is felt when compressed. Moreover, even when compared with the comparative example 2, there were many thread jamming at the time of sea-flooring, and the seaming property also fell. A result is shown in Table 2.

[Example 5]

3GT/PET2 side-by-side collected by changing the polymer A to polytrimethylene terephthalate (3GT: IV = 1.2 dl/g), spinning at a spinning temperature of 280°C, and performing spinning using the composite spinneret used in Example 1 All were carried out according to Example 2 except that the composite fiber was used as the core (single yarn fineness: 3.0 dtex).

In Example 5, compared with Example 1, the number of loops decreased, and the elongation recovery rate was lowered by stretching the crimping of the core during processing, but the stretchability was sufficiently secured, and the elastic modulus decreased, resulting in a soft feel. it had A result is shown in Table 3.

[Examples 6 and 7]

All were implemented according to Example 1 except having changed the supply speed to 50 m/min of core yarn, 500 m/min of super yarn (Example 6), 20 m/min of core yarn, and 1000 m/min of super yarn (Example 7).

In Example 6 in which the feed rate ratio was reduced, the loop size was slightly smaller than in Example 1, but the stretch properties characteristic of the present invention were equivalent and the feel was good.

In Example 7 in which the feed rate ratio was increased, the size of the loop was 60.1 mm, which was larger than that of Example 1, but there was little slack in the loop. As for the feel, it had excellent bulkiness with flexibility, but since it had a structure in which cutting and looseness of the first yarn were also suppressed, the unwinding properties were also good. A result is shown in Table 3.

[Example 8]

All were carried out according to Example 7 except that the airflow speed was changed to 500 m/s.

In Example 8, the tension between the nozzle and the take-up roller was lowered by increasing the airflow speed, and the running of the processed sand was slightly disturbed, but the processed sand could be collected without any problem. In the processed yarn, although the slack of the loop was rarely seen, the loosening property was not a problem, and the bulky yarn with the stretch property which is the characteristic of this invention was collect|collected. A result is shown in Table 3.

[Examples 9 and 10]

With respect to the composite fiber used for screening, all were carried out according to Example 2 except that the ratio of polymer A to polymer B was changed to 60/40 (Example 9) and 30/70 (Example 10).

Example 9 had almost the same characteristics as Example 2 because there was no significant difference in the crimp shape of the core and did not significantly affect the shape of the loop of the processed yarn.

In Example 10, the number of loops decreased as the crimp shape of the core became smaller, and the elongation recovery rate was increased as compared with Example 2. A result is shown in Table 4.

[Examples 11 and 12]

The eccentric core-sheath composite fibers of PET1/PET2 (Example 11) and PBT/PET2 (Example 12) obtained by using a composite nozzle having an eccentric core-sheath composite cross-section illustrated in FIG. 4(4-2) were used for screening, All were implemented according to Example 2 except having set the turning point to 0.0006.

In Example 11, the number of loops was slightly lowered compared with Example 2. On the other hand, in Example 12, as compared with Example 4, the number of loops increased and the restraints of the first yarn and the yarn became higher, so that the stretchability was improved. A result is shown in Table 4.

[Comparative Example 4]

All were carried out according to Comparative Example 2, except that the hollow fiber cotton PET fiber used in Comparative Example 2 was used as the core yarn, and the 3GT/PET2 side-by-side composite fiber used in Example 5 was used as the primary yarn.

In the sample of Comparative Example 4, the sheath yarn developed a three-dimensional crimped form after heat treatment, but the radius of curvature of the fibers forming the loop was very fine, tens of micrometers, and fractures of the sheath yarn were observed here and there. (with break: 0.4 pieces). In addition, by expressing this crimped form, the loop of the first yarn was greatly reduced compared with before the heat treatment, and there were few things exceeding 0.6 mm from the surface of the yarn. For this reason, although the texture of the processed yarn is unique like rubber, it does not have the bulkiness and flexibility as the object of the present invention. In addition, due to the fine crimping of the micrometer order, breakage of the sheath yarn, and variations in the protrusion of the loop, the coefficient of static friction between fibers was relatively high (0.4), and it was difficult to say that the unwinding property of the drum was good. A result is shown in Table 4.

[Example 13]

For the purpose of increasing the stretchability and flexibility of the processed yarn, the 3GT used in the polymer A of Example 5 was melted at 275° C., then measured and introduced into the spinning pack, and three slits (width 0.1 mm, 23 in Fig. 8) was discharged from the discharge holes for hollow cross-sections arranged concentrically so as to have a hollow ratio of 10%. After cooling and solidification by spraying a cooling wind at 20° C. to the discharged yarn at a flow of 20 m/min, a spinning emulsion was applied, and then the undrawn yarn was wound up at a spinning speed of 1500 m/min. All was carried out according to Example 1, except that the undrawn yarn was drawn 2.8 times at a drawing speed of 800 m/min between rollers heated to 70° C. and 130° C., and the fiber (single yarn fineness of 7.0 dtex) was used as the core.

In Example 13, loops made of sheath yarn protrude from the yarn surface by 38.0 mm on average, and the loops were bulky yarns formed in a number of 22 pieces/mm. This protruding loop was excellent in size and uniformity of period. In addition, the first yarn of the processed yarn had a three-dimensional crimped structure of millimeter order with a radius of curvature of 5.7 mm, and a continuous loop was formed in which the breaking point was not seen in the loop of the first yarn. (break point: 0.0)

In the bulky yarn, the super yarn forming a continuous loop has a three-dimensional crimped structure, the static friction coefficient between fibers is 0.1, and there is no problem in the unwinding property of the bulky yarn, it does not cause jamming, etc. I could (Haesung: S). In addition, in particular, the 10% modulus, which means resistance at the time of expansion and contraction, is as low as 1.2 cN/dtex, and the fiber recovery rate after load application is 100%, which is excellent in settling resistance. It had a surname (Tactile: S). A result is shown in Table 5.

[Example 14]

From Example 13, for the purpose of further improving stretch and settling resistance, the polymer was changed to a PBT-based elastomer (“Hytrel” manufactured by Toray DuPont), and the core was collected at a spinning temperature of 260° C. 13 was carried out.

In Example 14, the polymer type of the core was changed to a PBT-based elastomer having excellent flexibility, and in the bulky yarn, the modulus was significantly lowered by 10% compared to Example 13, and it had excellent stretchability and flexibility. In addition, the fiber length recovery rate is also greatly improved, and even when deformed by applying high stress, there is almost no settling. was found to be A result is shown in Table 5.

[Example 15]

Polypropylene (PP: MFR = 9 g/10 min) as an island component was melted at 265 ° C, and PET3 (0.65 dl/g) used in Example 1 as a sea component was melted at 300 ° C. Then, it was measured and introduced into a spinning pack, A hollow sea-island composite yarn as exemplified in FIG. 5 was melt-spun with a spin block temperature of 280° C., a hollow portion in the center of the fiber cross section, and a donut-shaped sea-island structure around it. The spinneret mounted on the spinneret uses a compound spinneret composed of a weighing plate and a distribution plate described in Japanese Patent Laid-Open No. 2011-174215, and as a distribution plate, a circular space in the center of the plate is provided, and a circular space is provided. A sea component polymer distribution hole was arranged in an annular shape on the periphery, and one arrangement was used in which one island component polymer distribution hole and six sea component polymer distribution holes were surrounded by six holes on the outer periphery. Composite polymers discharged at a composite ratio of island/sea = 30/70 are sprayed with a cooling wind at 20°C from one side at a flow of 100 m/min, cooled and solidified, then emulsion is applied, and undrawn yarn is wound up at a spinning speed of 1200 m/min. Then, it is stretched 2.9 times at a stretching speed of 600 m/min between rollers heated at 90°C and 130°C, fineness of 78 dtex, number of filaments 12, frequency per filament 32 degrees, hollowness 30%, density 0.87 g/cm 3 was made as an extension of In addition, since the hollow island composite yarn was brought into contact with the cooling wind at high speed, the fibers were cooled asymmetrically on the left and right sides, and after the heat treatment, gentle crimping was expressed.

In the process illustrated in Fig. 6 for the obtained hollow sea-island composite yarn, one hollow sea-island composite yarn is supplied to two supply rollers one by one, and suction is performed with one supply roller at a speed of 50 m/min and the other at a speed of 1000 m/min. suction with the nozzle. In the suction nozzle, compressed air was sprayed so that the air flow speed was 400 m/s at 20° to the running thread, and ejected from the nozzle together with the accompanying air flow so as not to confuse the core and the grass sand. ^{The yarn sprayed from the nozzle was run for 1.0 × 10 -4} seconds with the airflow, the yarn direction was changed using a ceramic guide, and the yarn was formed with a loop made of the sheath yarn, and the yarn was taken over at 50 m/min by the take-up roller.

Subsequently, the processed yarn was guided to the tube heater through a roller, and heat-treated in heated air at 150° C. for 10 seconds to set the shape of the bulky yarn, and to develop a three-dimensional crimp on the sheath yarn. The bulky yarn was wound on the drum at 52 m/min by a tension-controlled winder installed after the tube heater. In addition, the silicon-based emulsion containing polysiloxane at a concentration of 8 wt% in the collected bulky yarn is uniformly sprayed so that the final polysiloxane adhesion amount is 1 wt% with respect to the bulky yarn, and heat treatment at a temperature of 165°C for 20 minutes to collect the processed yarn did.

The bulky yarns collected in Example 15 had a structure in which loops made of sheath yarn protrude from the surface of the yarn by 21.0 mm on average, and the number of loops was 22/mm. This protruding loop was excellent in size and uniformity of period.

The core yarn and the sheath yarn have a three-dimensional crimped structure of millimeter order with a radius of curvature of 4.5 mm, and a continuous loop is formed in the loop of the sheath yarn in which no fracture point is visible. (break point: 0.0)

In the bulky yarn, the super yarn forming a continuous loop had a three-dimensional crimped structure, had a static friction coefficient between fibers of 0.1, and was very smooth and excellent in unwinding properties from the wound drum. ). In addition, it had bulkiness derived from the specific structure of the present invention, and had an excellent tactile feel in flexibility (tactile feel: S). In Example 15, compared with Example 1, although the stretch property fell, it exhibited the very outstanding performance in ^{bulky evaluation at 645 inch 3/20g.} A result is shown in Table 5.

[Examples 16 and 17]

The degree/sea composite ratio and the drawn yarn density of the hollow island-in-the-sea composite yarn used for the first yarn were determined as the degree/sea = 20/80 and the density 0.90 g/cm 3 (Example 16), the degree/sea = 10/90 and the density 0.93 g It carried out according to Example 15 except having changed to /cm<3> (Example 17).

The bulky yarn sampled in Example 16 formed a continuous loop in which a break point was not seen in the loop of the primary yarn. It had a superfine three-dimensional crimped structure, and was excellent in unwinding properties from the wound drum (feeling properties: S), and having a tactile feeling excellent in flexibility (tactile feel: S). In addition, in the bulky evaluation, it exhibited ^{excellent bulkiness at 606inch 3} /20g.

The bulky yarns collected in Example 17 formed a continuous loop in which no breaking point was seen in the loop of the first yarn. The sheath yarn had a three-dimensional crimped structure, had excellent unwinding properties from the wound drum (feeling properties: S), and had excellent tactile flexibility (tactile feel: S). In addition, in the bulky evaluation, it exhibited ^{good bulkiness at 581inch 3} /20g. A result is shown in Table 5.

[Examples 18 and 19]

The eccentric core-sheath composite fiber of PBT/PET2 used in Example 12 was used for the core yarn, and the feed rates were 50 m/min for core yarn, 500 m/min for yarn 500 m/min (Example 18), 20 m/min for core yarn and 1000 m/min for yarn yarn (Example 19). ), all were carried out according to Example 12.

In Example 18 in which the feed rate ratio was reduced, the loop size was slightly smaller than in Example 12, but it had good stretch properties characteristic of the present invention and exhibited excellent tactile feel.

In Example 19 in which the feed rate ratio was increased, the size of the loop was 38.0 mm, which was larger than in Example 12, but there was little slack in the loop. As for the feel, it had excellent bulkiness with flexibility, but since it had a structure in which cutting and looseness of the first yarn were also suppressed, the unwinding properties were also good. A result is shown in Table 6.

[Examples 20 and 21]

Except that the eccentric core-sheath composite fiber of PBT/PET2 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, everything was carried out according to Example 15 (Example 20) . Moreover, as a case where the feed rate ratio was changed, the processed sand at the time of setting it as 20 m/min of core yarns and 1000 m/min of primary yarns was also sampled (Example 21).

In Example 20, a loop having a low density and resilience derived from a PET component was formed, and similarly to Example 15, very excellent bulkiness was exhibited, and good stretch properties derived from the eccentric core-sheath composite yarn placed on the core were formed. It had a characteristic that did not exist in the past, such as expressing

In Example 21, the loop by the second yarn was further expanded by further increasing the second/core ratio, and the bulkiness was further improved compared to that of Example 20. In Example 21, although the loop was enlarged, the homogeneity in the fiber axis direction of the processed yarn was excellent, and the slackness of the loop was not seen. In addition, the loop was made independent by winding the sea-island hollow fiber with large crimping on the core with stretchability by crimping, and it also had the effect of the PET component and had a comfortable resilience. A result is shown in Table 6.

[Example 22]

Example 20 was followed except that the high elastic yarn made of the PBT-based elastomer (“Hytrel”) used in Example 14 was used for screening.

In the processed yarn of Example 22, excellent stretch properties were expressed by using an elastic yarn that elongatedly deformed under a low stress for the core, and it was also excellent in restoring properties in which the fiber length does not change even after a relatively high strain. Moreover, similarly to Example 20, the sea-island hollow fiber was employ|adopted for the primary yarn, and it was excellent also in bulkiness.

1: super
2: Judging
3: thread surface
4: Apostle Guide
5: distance from the seal surface
6: Curvature of the three-dimensional crimp
7: A polymer
8: B polymer
9: hollow
10: island component
11: Sea component
12: suction nozzle
13: turning point
14: processing yarn
15: takeover roller
16: heater
17: delivery roller
18 : winder
19: feed roller
20: Judging
21 : super
22: Compressed air injection angle
23: slit-shaped discharge hole

Claims (12)

In a bulky yarn comprising a sheath yarn that forms a continuous loop without breaking, and a core yarn that substantially fixes the sheath yarn by intersecting the sheath yarn, the number of loops protruding more than 3.0 mm from the yarn surface layer is 1/mm to 30/ mm, the elastic modulus is 80 cN/dtex or less, the elongation recovery rate at 10% elongation recovery is 50% or more, and the fibers constituting the primary yarn are three-dimensional crimped structural yarns with a radius of curvature of 2.0 mm to 30.0 mm. The method of claim 1,
A bulky yarn in which the single yarn fineness of the constituent fibers is 3.0 dtex or more, and the single yarn fineness ratio (second/core) of the core and the primary yarn is in the range of 0.5 to 2.5. 3. The method according to claim 1 or 2,
A bulky yarn whose core is a side-by-side or eccentric core-sheath composite fiber. 3. The method according to claim 1 or 2,
In a bulky yarn comprising a sheath yarn forming a loop, and a core yarn for substantially fixing the sheath yarn by intersecting the sheath yarn, the sheath yarn forms a continuous loop without substantially breaking, and a composite fiber having a density of less than 1.00 g/cm 3 In Bulkisa. delete 5. The method of claim 4,
The bulky yarn, which is a sea-island composite fiber with a hollow surface of 20% or more, with a hollowness ratio of 20% or more. 7. The method of claim 6,
A bulky yarn in which the island component of the sea-island composite fiber is polyolefin and the sea component is polyester. 3. The method according to claim 1 or 2,
In a bulky yarn comprising a sheath yarn having a three-dimensional crimped structure forming a loop, and a core yarn that substantially fixes the sheath yarn by intersecting the sheath yarn, the 10% modulus is less than 1.5 cN/dtex, and the fiber elongation ratio when a load is applied A bulky yarn having a value of 1.1 or more and a fiber length recovery rate of 80 to 100% after stretching under load. 9. The method of claim 8,
A bulky yarn having a fiber elongation ratio at the time of load application of 1.5 or more, and a fiber length recovery rate of 90 to 100% after extension under load. 3. The method according to claim 1 or 2,
Bulky yarn, characterized in that the coefficient of static friction between fibers is 0.3 or less. 3. The method according to claim 1 or 2,
A bulky yarn in which both the core yarn and the first yarn are made of hollow cotton fibers with a hollow ratio of 20% or more. A textile product comprising at least a part of the bulky yarn according to claim 1 or 2.

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