TW201712175A - Bulky yarn - Google Patents

Abstract

The present invention solves the problem of providing a bulky yarn comprising synthetic fibers, wherein tangling, etc. between filaments is suppressed while having a loop shape on the surface layer, and the bulky yarn has light weight and excellent warmth-retaining properties in addition to a soft feeling, while having good handling properties during higher-order processing. The present invention is a bulky yarn comprising synthetic fibers, the bulky yarn comprising a sheath yarn having a three-dimensional crimped structure, and a core yarn securing the sheath yarn by being interlaced with the sheath yarn, the sheath yarn forming continuous loops without being substantially cut.

Description

Fused silk

The present invention relates to a bulky yarn composed of a sheath yarn and a core yarn and composed of a composite fiber having a plurality of loops.

Synthetic fibers composed of a thermoplastic polymer such as polyester or polyamide have high basic characteristics such as mechanical properties and dimensional stability, and are excellent in balance. By using these fiber materials, high-order processing is performed on the fibers obtained by spinning to form various structural forms, which are used not only for clothing applications but also for indoor use, vehicle interior decoration, industrial use, and the like. The development of novel technologies for synthetic fibers, even if the motivation is to imitate the innovative technology of natural materials. There are various technical proposals for the ability of synthetic fibers to exhibit functions derived from natural complex structures. For example, by imitating the cross section of the silk, a special hand feeling such as birth defects and softness is exhibited. Special color is produced by mimicking Morpho butterfly and the like. Moreover, the cloth has a water-repellent property by imitating the lotus leaf. In addition, there is a combination of fiber structures capable of obtaining a soft hand and a light weight and a heat retention property possessed by natural feathers.

In the case of natural feathers, a small amount of down ball (grain) is used in combination with feathers (feathers) from the waterfowl's chest. These lines exhibit a specific structural form derived from keratin fibers, which is rich in soft hand and easy to apply to the body. Therefore, the use of natural feathers as a batt The products can be recognized by ordinary users, and are widely used in bedding or jackets and the like. However, from the point of view of nature conservation, the capture of waterfowl is limited, resulting in a limit on the total production of natural feathers. Moreover, due to the occurrence of abnormal weather or disease in recent years, there has been a problem that the supply amount has changed drastically, and the high price also poses a problem. Moreover, when natural feathers are used, although a plurality of steps such as taking, screening, disinfecting, and degreasing are carried out, a characteristic odor is left, and occasionally there is a problem of animal allergy. Also, from the point of view of caring for animals, there is also a tendency to exclude the use of natural feathers in places such as Europe. Therefore, the focus is on the crepe material composed of synthetic fibers that can be stably supplied.

The crochet material composed of synthetic fibers has been proposed from the past, and there have been no examples of natural feathers in terms of basic characteristics such as bulkiness, compression recovery, and soft hand.

In the wire processing technique which is used for the purpose of the high value-added of the fiber, for example, it is generally known that one or two or more kinds of fluid processing nozzles or the like are used, and the fiber is subjected to actual creping and then untwisting. Fiber blending allows for the production of bulky textured yarns. Since such a bulky processed yarn is basically a long fiber, it can be processed into various forms, and it is also suitable for the crepe material in consideration of the bulkiness and soft hand feeling of the processed yarn.

Patent Document 1 discloses the following processed yarns. First, the two kinds of fibers are used, and only one of the fibers is supplied to the waist gauge, and the actual crepe is applied in a concentrated manner, thereby facilitating the formation of the pile by the fibers imparted with the oscillating yarn or the like. Then, it is further untwisted by using two discs or the like to obtain a bulky textured yarn. The heat treatment is applied after the disintegration step, or the sheath wires are welded to each other by the binder in order to make the fixation of the sheath filament firm. The method disclosed in Patent Document 1 does indeed root According to conventional methods, by adjusting the degree of the pendulum wire, there is a possibility that a bulky wire having a loop formed by a sheath wire can be obtained.

Patent Document 2 discloses a technique in which the compressed air is ejected from the vertical direction in the traverse nozzle to cause the fibers to be opened and entangled, whereby the excessively supplied sheath filament length difference is fixed. In Patent Document 2, as in Patent Document 1, it is possible to obtain a textured yarn in which a sheath-like sheath yarn is present.

Such a looped bulky yarn causes entanglement between the fibers, which is generally recognized as a fastener phenomenon, which may adversely affect the unwinding of the high-order processing or the deterioration or durability of the fiber product. Therefore, there are also combinations that attempt to improve with fluid processing yarns as a starting point.

The main purpose of Patent Document 3 is to disclose that in the fluid jet-processed yarn, the loop portion is made of polytrimethylene terephthalate (3GT), and the elasticity of the 3GT fiber is used to make the fastening phenomenon less likely to occur. Loosely processed silk.

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open Publication No. 2011-246850

Patent Document 2: Japanese Patent Laid-Open Publication No. 2012-67430

Patent Document 3: Japanese Patent Laid-Open No. Hei 11-100740

According to Patent Document 1 of the above-described prior art, the binder is mixed in advance, and by fixing the loops welded after the processing, there is a possibility that it can be applied as a nip material. However, when the actual crepe is applied to the loop yarn which is partially protruding from the sheath wire, When the rubber of the mechanical smashing machine is smashed and untwisted, the pile may be partially broken or deteriorated. If the processed yarn is used as a nip, it may eventually be filled from several to several tens of bundles or the like. As a result, a portion having a large number of sheath filaments breaks into hairiness, and is entangled with the sheath yarn of the nearby processed yarn, which may cause unwinding failure or deterioration of the smoothness of the step during the forming process. Further, since the sheath wires between the processed filaments are significantly entangled with each other, there is a problem that foreign matter is felt and the texture is damaged when the processed yarn is filled. Moreover, since the entangled place is welded and fixed, there is also a problem that the foreign body sensation is more prominent.

According to the technique of Patent Document 2, when the wire is wound up in the nozzle and the fiber is opened and entangled, the wire is swayed in a very short cycle to cause wandering of the wire. Therefore, it is naturally necessary to form a small loop which is affected by the shape of the nozzle in accordance with the high frequency. Further, by the sheath yarn being randomly entangled with the core wire, the size of the pile is changed in the fiber axis direction, resulting in insufficient bulkiness. Further, after the loop yarn formed in the nozzle stays inside the nozzle, it is discharged outside the nozzle by spraying air. Therefore, in the direction of the fiber axis of the processed yarn, the size of the loop or the length of the sheath filament forming the loop may be changed to form slack. In this case, in particular, the slack sheath filament is easily entangled with other sheath filaments, and there are still problems such as smoothness of the steps associated with high-order processing or foreign body sensation at the tangled state of the sheath filament.

According to the technique of Patent Document 3, the 3GT which is elastically stretched and deformed is used, and the sheath yarn has an appropriate resilience. Even in the case of a wire length difference, the loop can be reduced in size and the seizure phenomenon can be suppressed. However, the loops are as small as about 0.6 mm. If the number of loops is increased for the bulkiness, the density of the sheath filaments will increase, and thus the sheath filaments are likely to cause entanglement with each other, and there is a possibility that the seizure phenomenon cannot be suppressed. .

In order to solve the conventional problem, it is expected that the material having the high bulkiness and the compression recovery property comparable to the natural feather and the entanglement between the processed yarns is suppressed, the present invention It is a bulky yarn which is excellent in handleability for high-order processing and which is excellent in light weight and heat retention, in addition to a soft hand.

The above problems were achieved by the following means.

A bulky yarn comprising: a sheath yarn having a three-dimensional crimped structure; and a core yarn fixed by a streak of the sheath filament The sheath wire is substantially not broken and the loop is continuously formed.

2. The preferred aspect of the above-mentioned bulky yarn is as follows.

The above-mentioned bulky yarn, wherein the single filament fineness ratio (sheath/core) of the core filament and the sheath filament is in the range of 0.5 to 2.0; the interlaced point of the core filament and the sheath filament is present in the fiber axis direction of the expanded filament. From /mm to 30/mm; the crimped construction of the sheath filament has a radius of curvature of 2 mm to 30 mm.

3. The bulky yarn according to any one of the preceding claims, wherein the fiber constituting the bulky yarn has a single yarn fineness of 3.0 dtex or more; and the interfiber friction coefficient is 0.3 or less.

4. The bulky yarn according to any one of the preceding claims, wherein the core yarn has a three-dimensional crimp.

5. The bulky yarn according to any one of the preceding claims, wherein one of the core yarn and the sheath yarn is a hollow cross-section fiber having a hollow ratio of 20% or more.

6. The bulky yarn according to any one of the preceding claims, wherein the core yarn and the sheath yarn are the same type of single-component fibers.

However, the use of the above-mentioned bulky yarn has the following products.

A fibrous product comprising at least a part of the bulky yarn according to any one of the above items.

The bulky yarn of the present invention has a loop shape, and the entanglement between the bulky yarns is suppressed, the handling property of the high-order processing is good, the soft hand feeling is soft, and it is lightweight and excellent in heat retention.

1‧‧‧sheath

2‧‧‧core wire

3‧‧‧Processing wire centerline

4‧‧‧ silk guide

5‧‧‧The distance from the center line of the processing wire to the apex of the loop

6‧‧‧Three-dimensional contraction

7‧‧‧Supply Rolla

8‧‧‧Synthetic fiber

9‧‧‧ suction nozzle

10‧‧‧ Turning point

11‧‧‧Processing wire

12‧‧‧ traction roller

13‧‧‧heater

14‧‧‧Transporting Rolla

15‧‧‧Winding machine

16‧‧‧Compressed air jet angle

17‧‧‧Slit-like spit hole

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

Fig. 2 is a simulation diagram for explaining a method of measuring a center line of a processed wire.

Fig. 3 is a schematic diagram schematically showing a three-dimensional crimping configuration.

Fig. 4 is a schematic flow chart for explaining an example of a method for producing a bulky yarn of the present invention.

Fig. 5 is a schematic side view for explaining a suction nozzle used in the method for producing a bulky yarn of the present invention.

Fig. 6 is a schematic cross-sectional view showing a discharge hole of a spinning nozzle for a hollow section used in the method for producing a bulky yarn of the present invention.

Hereinafter, an aspect for carrying out the invention will be described. Further, the bulky yarn of the present invention is obtained by processing a multifilament yarn, and the material in the middle of the production of the bulky yarn and the bulky yarn is also referred to as a "processed yarn".

The bulky yarn of the present invention is composed of synthetic fibers and has a bulky structure. The structure consists of a sheath filament forming a loop and a core wire that substantially secures the sheath filament by interlacing with the sheath filament. However, the sheath filament is characterized by having a three-dimensional crimping configuration. Further, in the present invention, the sheath yarn system is substantially not broken. That is, the sheath silk is almost continuous by the bulky silk Continued. However, the sheath wire continuously forms a plurality of loops.

The term "synthetic fiber" as used herein refers to a fiber composed of a high molecular polymer. The synthetic fiber may be a fiber produced by melt spinning or solution spinning. Among the high molecular polymers, the thermoplastic polymer which can be melt-molded is a melt-spinning method which is highly productive, and since the fiber used in the present invention can be produced, it is suitable for use in the present invention.

The thermoplastic polymer herein may, for example, be polyethylene terephthalate or a copolymer thereof, polyethylene naphthalate, polybutylene terephthalate or polytrimethylene terephthalate. A melt-formable polymer such as polypropylene, polyolefin, polycarbonate, polyacrylate, polyamide, polylactic acid, or thermoplastic polyurethane. Among these thermoplastic polymers, the polycondensation polymer represented by polyester or polyamine is a crystalline polymer, and because of its high melting point, it is carried out at a higher temperature even in subsequent steps, forming and actual use. In the case of heating, deterioration or permanent fatigue does not occur, so it is suitable. From the viewpoint of heat resistance, the melting point of the polymer is preferably 165 ° C or higher.

The synthetic fiber used in the present invention may contain, for example, an inorganic substance such as titanium oxide, cerium oxide or cerium oxide; a coloring agent such as carbon black, a dye or a pigment; a flame retardant, a fluorescent whitening agent, an antioxidant, or an ultraviolet ray. Various additives such as absorbents.

The bulky yarn of the present invention is composed of a sheath yarn 1 forming a loop and a core yarn 2 substantially fixed to the sheath filament by interlacing with the sheath filament as illustrated in Fig. 1 .

Refer to Figure 2. The core wire preferably belongs to the original yarn and is present in the range of 0.6 mm from the center line 3 of the processed wire. The center line of the processed wire refers to a straight line connecting the wire guides 4 when a long wire is processed between the pair of wire guides 4. The raw yarn which is located at a distance 5 from the center line of the processed yarn of 0.6 mm or less is a so-called core yarn of the present invention and serves as a support yarn of the sheath velvet loop. Further, the sheath wire preferably belongs to the original yarn, and protrudes from the center line of the processed wire by a distance of 1.0 mm or more in a loop shape. The sheath silk is in the palm of the present invention Looseness. In the present invention, the core wire is fixed with a sheath wire forming a loop. The staggered points have the function of supporting the loops formed by the sheath filaments of the features of the present invention, and are preferably present at a certain degree of cycle. From this point of view, the interlacing point of the core yarn of the bulky yarn and the sheath yarn is preferably from 1/mm to 30/mm per 1 mm of the bulky yarn. If it is within this range, even if the sheath wire is subjected to three-dimensional crimping, the loops may be present at a moderate interval. If this viewpoint is promoted, the staggering point is preferably from 5/mm to 15/mm.

The photoelectric type hairiness detecting device can be applied when the determination of the core wire or the sheath wire, or the staggered point or the number of loops per unit length is continuously evaluated in the longitudinal direction of the filament of the bulked yarn. For example, using a photoelectric hairiness measuring machine (TORAY FRAY COUNTER), the wire speed is 10 m/min, and the wire tension is 0.1 cN/dtex, and the distance from the center line of the processed wire is 0.6 mm to 1.0 mm.

The sheathed sheath yarn of the present invention has a prominent shape in the cross section of the expanded filament viewed from the longitudinal direction of the filament of the bulky filament, and is formed to be larger than the conventional interlaced yarn or taslan processed silk. Velvet ring.

The size of the loops herein refers to the distance 5 from the center line 3 of the processing yarn to the apex of each loop as shown in FIG. The size of the loop is measured from the side by the length of the filaments on the pair of guide path guides 4, and then measured from the observed image. For the randomly selected one of the bulky yarns, it is possible to observe the formation of more than 10 loops on the bulky yarn, and then measure the distance between the center line of the processed yarn and the apex of the loop by 10 places in the image. 5. In this operation, a total of 10 places of image shadows are taken for one piece of the bulky yarn, and the size of the pile of 100 pieces of the pile of the bulky yarn is measured from the millimeter unit to the second decimal place. The average value of the numerical value is calculated, and the value rounded off the second decimal place is set to the size of the loop of the expanded yarn.

According to the review by the inventors, the size of the loop is preferably from the center line of the processing wire. The range of 1.0 mm or more and 100.0 mm or less is protruded, and if it is within this range, it is combined with the crimping structure of the sheath wire to enhance the bulkiness of the object of the present invention and the effect of suppressing entanglement. Moreover, in consideration of the workability to the bulky yarn to be described later, it is more preferably 3.0 mm or more and 70.0 mm or less. Further, in consideration of repeated application of compression recovery deformation in a severe environment such as sportswear, it is particularly preferable to be 5.0 mm or more and 60.0 mm or less.

Here, the shape of the loop composed of the sheath wire is preferably a knot-type loop (teardrop shape) as compared with a bow-shaped loop which is generally formed by the entanglement. In the case of a bow-shaped loop, the point of intersection of the core wire and the sheath wire is not fixed, and the loop has a feature of free movement to some extent, so that when compression deformation is applied to the wire, the staggered point moves. Therefore, it is difficult to return to the original shape after compression deformation, and thus there is a disadvantage in terms of durability of bulkiness. On the other hand, in the case of the knot type loop, since the loops at the point of intersection with the core wire are almost fixed, the loop of the sheath wire is easily restored to the original shape after compression deformation, and will be exerted. This shape is more suitable in terms of the bulkiness of the rebound. However, the knot type loop has a viewpoint of suppressing the entanglement of the sheath wires with each other, and since the sheath wire is fixed, it may become an unfavorable shape. The three-dimensional crimped sheath filament of the present invention inhibits the entanglement of the sheath filament. Further, it was found that high bulkiness can be exhibited by the three-dimensional crimping and the shape of the loop.

It has been found that if the loop formed of the sheath filament is broken or partially deteriorated on the way, the above effect tends to be lowered. Therefore, the sheath yarn of the present invention does not substantially break in order to achieve the opposite characteristics of bulkiness and suppression of entanglement which are not conventionally known. The special system does not substantially break on the way of the loop.

The fracture determination of the loop of the present invention randomly selects 10 places from one processing wire composed of the sheath wire and the core wire, from the intersection point of each core wire and the sheath wire to the next interlacing point (ie, a pile of velvet) Circle), according to the direction of the long side of the processed wire Shots, observations, and judgments are made at magnifications of more than 10 places. That is, in the ten shadow images, the sheath break point per 1 mm of the bulking yarn was counted for each of the ten loops. The counted pile loop break points were averaged, and the second decimal place was rounded off to set the break point (number/mm) of the loop. Here, the average fracture point of the total of 100 loops is 0.2/mm or less, and the so-called sheath yarn of the present invention is substantially not broken. In other words, the length of the bulky yarn is a state in which the sheath filament is almost continuous. If it is within this range, the sheath wire which is free at the silk end is substantially absent, and a loop which does not become entangled with other sheath wires can be formed.

It is known that when the actual twisting is applied, the untwisting step is applied, or when the air is blown in the nozzle by the strong air jet, the fiber is broken in the inside of the nozzle made of metal, and the wire is broken. Or a situation of deterioration. Further, when the loop is to be formed, it is necessary to break between the rubber discs and the like, and the sheath yarn is broken or the mechanical properties are largely lowered. Therefore, it is considered that the broken sheath wire may be wound on other sheath wires or entangled, thereby promoting the fastening effect, resulting in the limitation of the structural form of the wire or the high-order processing. In the present invention, this point has been greatly improved, and as described above, the woven effect of the sheath yarn having the three-dimensional crimp can be sufficiently exerted.

The main slender sheath wire has a three-dimensional crimping structure, which does not substantially break, and continuously forms a loop. The three-dimensional crimping structure of the present invention is illustrated in Fig. 3, and the monofilament of the raw yarn has a spiral configuration.

In the evaluation of the three-dimensional crimping, ten places were randomly selected from the bulky yarns, and ten or more sheath wires were selected, and the sheath yarns were observed and evaluated by a digital microscope or the like according to the magnification at which the crimped shape was confirmed. In this image, when the observed sheath filament has a form that spirals in a spiral shape, it is determined that it has a three-dimensional crimping structure, and if it is not the case, it is determined that it has no crimping structure.

A fiber having such a three-dimensional crimping structure like a spring has a restoring force to elongation deformation and compression deformation. The bulky yarn of the present invention has such a structure by the sheath yarn, and has a good texture and resilience. When the present invention is bulky and the yarn is filled in the form of a yarn bundle between the fabrics, the characteristic resilience woven by the bulky yarn of the present invention exhibits a good touch of the filler, and when repeated compression recovery is applied The sheath wire supporting it will still recover like a spring, and thus it is suitable from the viewpoint of suppressing permanent fatigue. The three-dimensional crimped size of a conventional crimped yarn obtained by a conventional method, such as a side-by-side type composite fiber or a hollow fiber, is generally a micron order (10 ^-6 m). In order to enhance this effect, the present invention is preferably a millimeter (10 ^-3 m) larger than this. According to the size of the three-dimensional crimping, the bulkiness or resilience of the cross-section of the bulky yarn viewed from the longitudinal direction of the filament of the bulky yarn can be freely controlled, and of course, the rebound property can also be suppressed. The sheath wires of one of the objects of the present invention are entangled with each other. In particular, by setting the crimp size to the millimeter level, the bulkiness and compressibility of the sheath yarn are mainly taken into consideration, and the entanglement between the sheath wires can be suppressed.

The radius of curvature of the spiral structure in which the sheath filament of the present invention is spirally rotated is preferably in the range of 1.0 to 30.0 mm. Here, the radius of curvature of the spiral structure is an image obtained by performing a secondary element observation by a digital microscope or the like in the same manner as the above-described determination of the presence or absence of a three-dimensional contraction. As shown in Fig. 3, the radius of the bend 6 formed by the fiber having the spiral structure is defined as the radius of curvature. Ten or more sheath wires were taken from 10 places randomly selected from the bulky silk, and the magnification of the crimped form was observed for each sheath wire by a digital microscope, and the total number of sheath wires was measured to a decimal number in millimeters. Point 2nd. It is calculated that these measurements are worthy of simple averaging, and the value rounded off the second decimal place is set to the radius of curvature of the three-dimensional crimping structure.

The radius of curvature is more preferably 2.0 to 20.0 mm. If it is within this range, the compression of the cross section seen from the longitudinal direction of the filament of the bulky yarn has a moderate rebound feeling, and The sheath wires are in contact with each other at a point to achieve a moderately resilient bulkiness. Also, the special system is 3.0 to 15.0 mm. In this range, there is no problem of long-term durability, and the effect of the present invention can be effectively exerted if it is used for the use of a clothing for applying repeated compression recovery, particularly for a sportswear used in a severe environment. The reason is that the monofilament imparted by mechanical pressing is not mechanically bent, so that the monofilament itself has a three-dimensional three-dimensional shape and has a spiral or the like. These crimped forms are micron-sized and micro-crimped, so that the snap-fit effect is easily promoted by the fine spiral structures intermingling each other.

On the other hand, in order to achieve the problem that the inventors and the like have suppressed the entanglement of the bulky yarns, the inventors have reviewed the single fiber form. As a result, when the sheath wire is composed of a monofilament having a millimeter-scale three-dimensional crimp, it is found that a phenomenon opposite to the conventional knowledge occurs. This phenomenon is considered to be caused by the fact that the sheath filaments have a millimeter-scale three-dimensional crimping, and even if the yarn bundle is formed, the bulky filaments have a suitable exclusion volume from each other, and the seizure of the sheath filaments is greatly suppressed. That is, the sheath 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, the loop has a hemispherical shape with a radius of 1.0 mm or more centered on the staggered point. Movable space. In this case, the sheath wires having the three-dimensional crimp which are overwhelmingly larger than the fiber diameter size are in point contact with each other and rebound, so that one sheath wire can exist separately without being entangled. Further, the reason is that the sheath wire having the three-dimensional crimping, in addition to the aforementioned moving space, the sheath wire itself can be elongated like a spring in the direction of the fiber axis, so that when the sheath wires cross each other, vibration is applied. Can simply unwind.

Further, the three-dimensional crimping of the sheath wire can also exert an effective effect on the bulkiness of the basic characteristics of the present invention. The point contact between the sheath wires is such that the sheath wire still has a mutual rebound effect even in one bulky yarn, and the initial bulkiness is restored, and the loop formed by the sheath wire can be maintained even after a long period of time. Radial open fiber state. The spring-like behavior of the sheath filament of the present invention is known to be difficult to achieve only by the straight sheath filament.

The formation of the pile loop from the sheath yarn of the present invention and having the morphological characteristics of the three-dimensional crimp structure can also cause an effect of lowering the friction coefficient. This phenomenon is as described above, and is in contact with other contact points between the sheath wires, and is one of the effects achieved by the present invention having a specific structure of the bulky yarn. According to the review by the inventors of the present invention, in order to have bulkiness and to suppress entanglement between the bulky fibers, the coefficient of static friction between fibers is preferably 0.3 or less. Here, the inter-fiber static friction coefficient is measured by a method described in "Coefficient of Friction" of JIS L 1015 (2010) "Chemical Fiber Staple Test Method" by a radar type friction coefficient tester. In addition, since JIS is intended for short fibers, it is prescribed that pre-operation such as opening of fibers is performed during measurement. However, in the measurement of the present invention, processing such as opening of fibers is not performed, but the expanded fibers are arranged in parallel in a cylinder. The sliver was evaluated.

When the bulky yarn of the present invention is formed into a fiber product, since the fiber is moderately slid and moved during compression, the hand feel is improved, and thus the coefficient of static friction between the fibers is preferably low. The coefficient of static friction between fibers is preferably 0.2 or less, and particularly preferably 0.1 or less.

Further, in view of the fact that the bulky yarn of the present invention appeals to a more excellent touch, the monofilament fineness ratio (sheath/core) of the sheath yarn and the core yarn is preferably in the range of 0.5 to 2.0. If it is within this range, the sheath yarn and the core wire are close to each other, and can be used without any foreign body sensation during compression. Further, the monofilament fineness ratio (sheath/core) which can efficiently perform the bulk processing range is, for example, 0.7 to 1.5. Further, the bulky yarn of the present invention may be combined with various fibers, but in view of the above-described efficient fluid processing and compression, the foreign body feel is not felt at all, and the core yarn and the sheath yarn are preferably the same as the single yarn fineness and mechanical properties. By. Specifically, in the present invention, it is preferable to prepare two or more fibers produced under the same yarn-making conditions, and to use them as a core yarn and a sheath yarn, and particularly preferably those fibers composed of one (separate) resin. .

In view of the reduction in the coefficient of friction of the bulky yarn or the suppression of entanglement, the core yarn is preferably a three-dimensional crimped structure having a millimeter order in addition to the sheath yarn. The radius of curvature of the helical structure of the core wire is preferably in the range of 1.0 to 30.0 mm. Within this range, there is a gap between the strands derived from the three-dimensional crimping of the core filament at the point where the core filaments of the sheath filament are substantially fixed. The reason for this is that when the tension is not applied to the bulking yarn, the loop fulcrum can be moved in the space limited to the long side direction, and thus the movement space of the sheath yarn is enlarged, and the entanglement of the present invention can be more clearly achieved or Soft hand effect. On the other hand, when the tension is applied to the bulky yarn, the binding force at the point where the core yarn and the sheath yarn are interlaced is increased by the elongation of the core filament, and in the practical aspect, the loop is released and the sheath is prevented from being prevented. Effective effects such as shedding. The three-dimensional crimping of the core yarn is also confirmed by the core wire observation method of the sheath yarn according to the evaluation method of the three-dimensional crimping of the sheath yarn. The spiral configuration of the core wire preferably has a radius of curvature of 3.0 to 15.0 mm. When it is in this range, long-term durability is good, and if it is applied to a clothing use or a sportswear which repeatedly applies elongation deformation to a bulky yarn, the effect of the present invention can be effectively exerted.

The core wire and/or sheath wire used in the present invention is preferably a hollow cross-section fiber. Further, the fiber having a three-dimensional crimping structure is more preferably a hollow cross-section fiber. The reason is that the size of the three-dimensional crimping can be freely manufactured from large to small.

Further, from the viewpoint of protruding the loop, it is preferable to use a hollow section fiber. The reasons for this are explained below. The pile loop composed of the sheath yarn of the present invention starts from the point of intersection with the core filament, and can be formed by the rigidity of the sheath filament. Further, in consideration of prevention of permanent fatigue, the quality of the sheath wire itself is preferably small. Therefore, from the viewpoint of the lightweightness of the sheath, a hollow cross-section fiber having a hollow ratio of 20% or more is preferred. The term "hollow ratio" as used herein means the volume fraction of the fiber in which no material is present.

For example, it can be measured in accordance with the following method. Depending on the sheath or core wire After the surface was cut, the cross section of the fiber was observed by electron microscopy (SEM) to observe the magnification of 10 or more fiber cross sections. Ten randomly selected fibers were taken from the image to be photographed, and the circular diameter of the fiber and the hollow portion was measured using an image processing software, and the area ratio of the hollow portion was calculated therefrom. The above operation was carried out for the 10 images that were captured, and the average of the 10 images was set as the hollow ratio of the hollow section fibers of the present invention.

In the case of a circular hollow fiber, a simple hollowness evaluation method is as follows.

The side surface of the hollow-section fiber was observed by an amplifying means such as a microscope, and the fiber diameter of the circular cross section was measured from the image. The fiber diameter and the density of the fiber material can also be used to calculate the ratio of the fineness of the measured fineness to the non-hollow fiber, and the hollow ratio can be set.

The hollow ratio is particularly suitable for the purpose of light weight and heat retention of the object of the present invention. The bulky yarn of the present invention further contains air, and more preferably has a hollow ratio of 30% or more. If it is within this range, the bulkiness of the bulky yarn can be felt to be better. Moreover, since it means that more air having a lower thermal conductivity is contained inside, the heat retaining property can be further improved. From this point of view, it is preferable that the hollow ratio value is higher, and in the yarn forming step or the fluid processing step described later, the range of the hollow portion can be stably produced without damage, and the hollow ratio is preferably 50% or less.

The bulky yarn of the present invention has excellent bulkiness, and the silk constituting the yarn has a moderate rebound property. In view of the problem to be solved by the present invention, the single fiber fineness of the synthetic fiber constituting the bulked yarn is preferably 3.0 dtex or more. Further, in the case of a wadding, since the deformation such as repeated compression recovery is applied, the original yarn is preferably moderately rigid, and the fineness of the single yarn is preferably 6.0 dtex or more. Here, the fineness refers to a value calculated from the obtained fiber diameter, the number of raw yarns, and the density, or the fiber is measured from a plurality of times. A simple average of the weight per unit length is calculated for each 10,000 m mass.

The rupture strength of the bulky yarn of the present invention is preferably 0.5 to 10.0 cN/dtex, and the elongation is preferably 5% to 700%. The term "strength" herein refers to a load-elongation curve obtained by taking the yarn according to the conditions shown in JIS L1013 (1999), and dividing the load value at the time of breaking by the value of the initial fineness. The elongation refers to the value obtained by dividing the elongation at break by the initial length. Further, the breaking strength of the bulky yarn of the present invention is such that the step of the high-order processing step is smooth or formed to withstand an actual user, preferably 0.5 cN/dtex or more, and the upper limit which can be carried out is 10.0 cN/dtex. Further, the degree of elongation is preferably 5% or more in consideration of the smoothness of the step of the post-processing step, and the upper limit which can be implemented is 700%. The breaking strength and elongation are adapted to the intended use and can be adjusted by controlling the conditions of the manufacturing steps. When the bulky yarn of the present invention is used for a general clothing use such as a lining or a table cloth, or a bedding such as a quilt or a pillow, the breaking strength is preferably 0.5 to 4.0 cN/dtex. Moreover, in the use of sportswear, which is used in a relatively severe condition, the breaking strength is preferably 1.0 to 6.0 cN/dtex.

The bulky yarn of the present invention can be formed into various fiber structures such as a fiber winding bobbin or a tow, a short fiber, a cotton, a fiber ball, a cord, a pile, a woven fabric, a non-woven fabric, and the like, and can be used as various fiber products. Here, the fiber product can be used from general clothing materials to sportswear, clothing materials, carpets, sofas, curtains and other interior decorative products, car seat and other vehicle interior fittings, cosmetics, cosmetic masks, wipes, health products, etc. Environmental use, industrial use, industrial use, filters, and hazardous materials removal. In particular, the bulky yarn of the present invention is preferably used as a nip for its effect of bulkiness and suppression of entanglement. In this case, since the nip is filled in the inner liner, a plurality of sheets of tens to several yarn bundles or non-woven fabrics can be formed. In particular, when the flaking is performed, the filling of the inner liner is simple, and it is easy to adjust the filling amount in accordance with the use. Therefore, it becomes a thin and lightweight ‧ insulation material, and there is no need to worry about getting out of the inner liner, nor Unnecessary sewing is required, and thus the form of the fiber product is not limited, and complicated design or the like can be performed.

Hereinafter, an example of a method for producing a bulky yarn of the present invention will be described.

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

The spinning temperature of the synthetic fiber used in the present invention is set to a temperature at which the polymer used is fluid. The fluidity temperature varies depending on the molecular weight, and the melting point of the polymer is an index, and may be set to be equal to or higher than the melting point and at a melting point of +60 ° C or lower. When the melting point is +60 ° C or less, there is no possibility that the polymer is thermally decomposed in the spinneret or the spinning module, and the molecular weight reduction can be suppressed, which is preferable. Further, the range in which the discharge amount is generally stable and discharged is 0.19/min/hole to 20.0 g/min/hole per discharge hole. In this case, it is preferable to consider the pressure loss of the discharge hole which can ensure the discharge stability. The index of the pressure loss is preferably in the range of 0.1 MPa to 40 MPa, and can be adjusted according to the melt viscosity of the polymer to be used, the size of the discharge hole, and the discharge amount.

The molten polymer thus discharged is cooled and solidified, and the oil agent is supplied and pulled by the roller to become a fiber. Here, the traction speed may be determined from the discharge amount and the target fiber diameter, and it is preferably set to be 100 to 7000 m/min in order to be stably produced. From the viewpoint of high alignment and improvement of mechanical properties, the synthetic fiber can be stretched before being stretched, or can be carried out without first performing winding. The extension condition is, for example, an extension machine composed of a pair of or more rollers. When the polymer is generally melt-spun, the first roller set to a glass transition temperature or higher and the second roller set to a crystallization temperature are used. After the peripheral speed ratio (2nd roller / 1st roller) is extended, the coiler is used for winding. Moreover, when there is no glass-transferred polymer, the dynamic viscoelasticity measurement (tan δ) of the composite fiber is performed, and the peak of the temperature/tan δ curve is obtained (plural The case is the highest temperature. The temperature above the temperature is set to the preheating temperature and can be used as the first roller temperature. Here, from the viewpoint of increasing the stretching ratio and improving the mechanical properties, the extension step is also a suitable means in a multi-stage implementation.

The cross-sectional shape of the synthetic fiber of the present invention is not particularly limited, and a general circular cross section, a triangular cross section, a Y shape, an octagonal shape, a flat shape, and the like can be formed by changing the shape of the discharge hole of the spin nozzle. , or a hollow shape or the like. Further, it may be a composite fiber composed of two or more kinds of polymers, which are not necessarily composed of a single polymer. However, the viewpoint of the three-dimensional crimping of the sheath yarn which is an important requirement of the present invention is exhibited. In the above, it is preferable to use a hollow cross section or a side-by-side type composite fiber which is bonded by two kinds of polymers. Among these fibers, heat treatment is performed after the yarn is formed and the yarn is processed, and by the presence of the foreign matter in the cross section of the single fiber, the three-dimensional crimping can be exhibited. Therefore, although it is a so-called straight fiber at the time of fluid processing mentioned later, after the process of forming a loop by a sheath wire, the crimping of the three-dimensional is shown by heat processing.

If the fiber is straight during the bulking process, the wire will not be clogged at the nozzle or the like, and the wire can be easily walked away. Further, when the pile of the present invention is formed, the rotation of the core yarn and the sheath yarn is effectively performed, and the loops are extremely close to each other in the fiber axis direction of the processed yarn. By subjecting the processed wire having the loop to heat treatment based on the crystallization temperature of the polymer, the sheath filament exhibits a three-dimensional crimp and becomes a bulky yarn. The three-dimensional crimping of the sheath filament exhibits good bulkiness in both the circumferential direction and the cross-sectional direction of the processed yarn, and is suitably controlled in accordance with the required characteristics.

From the viewpoint of controlling the degree of curling appearance after the heat treatment, the fiber to be used is more preferably a hollow cross-section fiber composed of a single-component polymer. In the case of a hollow section fiber, the fiber center has an air layer having a low thermal conductivity. Therefore, for example, after being discharged from a spinning nozzle which can form a hollow section, it is forcibly cooled by excessive cooling air or the like. On one side, or by heat treatment on one side excessively by a heating roller or the like during stretching, a structural difference can be generated in the cross-sectional direction of the fiber. In the case of a hollow-section fiber composed of a one-component polymer, in addition to yarn production by a separate spinning machine, it is relatively simple to obtain a three-dimensional crimp of a large size to a small size by the aforementioned operation. Therefore, from the viewpoint of the present invention and the crimping control by the above operation, as described above, the hollow ratio is preferably 20% or more, more preferably 30% or more.

Next, an example of a method of producing a bulked yarn from the fiber obtained by performing spinning will be described.

The method for producing a bulked yarn exemplified herein is basically composed of two steps. In the first step, the core wire and the sheath wire are interlaced by a fluid to form a bulking process of the loop formed by the sheath wire. The second step is a heat treatment step in which the sheath filament exhibits a three-dimensional crimp by heat-treating the loft-processed yarn.

An example of the method for producing the bulky yarn of the present invention will be described based on the schematic step diagram of Fig. 4 . In the first step, the synthetic fiber 8 which is a raw material is pulled out by a predetermined amount by a supply roller 7 having a nip roller or the like, and is sucked into a core wire and a sheath by a suction nozzle 9 capable of jetting compressed air. wire.

In the suction nozzle 9, the flow rate of the compressed air ejected from the nozzle is such that the tension that can be ejected from the supply roller causes the wire inserted in the nozzle to have the minimum necessary limit, and the pendulum does not occur between the supply roller and the nozzle. Silk, etc., can flow safely. This flow rate is optimally changed by the diameter of the suction nozzle to be used, and the tension can be imparted to the yarn, and the range of the loop which will be described later can be smoothly formed in the nozzle at a flow velocity of 100 m/s or more. The upper limit value of the air flow rate is 700 m/s or less. If the compressed air is excessively sprayed in this range, the wire wobble is not generated, and the nozzle is stably moved in the nozzle.

Further, from the viewpoint of preventing the processing yarn in the suction nozzle from being disturbed and opened, the injection angle of the compressed air (16 of FIG. 5) is preferably set to be less than 60° with respect to the wandering wire. Push the jet. The reason for this is that the loops can be formed from the sheath filaments in a homogeneous manner with high productivity. Of course, the processing performed by the vertical jet which ejects the fluid at 90° with respect to the wandering wire is not incapable of manufacturing the bulky yarn of the present invention, but the spinning of the wandering wire is caused by the suppression of the jetting by the jet in the vertical direction, and The narrow space in the nozzle has the viewpoint that the monofilaments are entangled with each other, and it is preferable to use the propulsion jet to perform the processing. The processing by the propelling jet can also suppress the situation in which the arcuate dowel is easily formed in a short cycle when the vertical jet is jetted.

The bulky yarn of the present invention is formed by a loop composed of a sheath wire, and it is preferable to do not disturb or open the fiber in the suction nozzle. The angle of the compressed air is preferably 45° or less with respect to the wandering wire from the viewpoint that the multifilament composed of one-numbered to two-digit counts can travel without breaking in the nozzle. Further, in order to form a loop outside the nozzle to be described later, it is preferable to increase the stability and the propulsive force of the jet stream immediately after the nozzle is ejected. From this point of view, the jet angle is preferably 20 or less with respect to the wandering thread.

The yarn guided to the suction nozzle may be applied by one yarn feeding and may be applied by two yarn feeding yarns. When manufacturing the bulking yarn of the present invention, it is preferable to perform processing by using two yarn feeding yarns. Here, the two yarn feeding systems mean that the core yarn and the sheath yarn are supplied to the nozzle by the difference in the supply speed (amount) by the respective supply rollers or the like. By using the turning force caused by the airflow described later, the yarn on the excess supply side becomes a sheath yarn to form a loop.

In the case of applying the two yarn feedings, it is not impossible to form a loop in the nozzle by using a staggered processing nozzle or a Taslon processing nozzle which imparts a disorder, a fiber opening and an entanglement effect to the wandering wire in the nozzle. However, the addition obtained by using these processing nozzles In addition to the easy formation of the loop in a short cycle, the size of the wire is also likely to be small.

Therefore, in the manufacture of a bulky yarn satisfying the object of the present invention, it is necessary to carefully control the majority of the presence of parameters. Moreover, in the case of multi-spinning, since the bulkiness of the bulky yarn may be different depending on each of the spinning, it is preferable to use the airflow control outside the nozzle which is described later from the viewpoint of quality stability. The way. In this regard, it is considered that it is not necessary to actively impart disturbance and fiber opening treatment in the nozzle.

Next, the yarn to which the compressed air is supplied is rotated outside the nozzle to form a loop composed of a sheath wire. This concept is to create the concept of a loop by rotating two strands supplied away from the nozzle position. When the ratio of the airflow speed to the wire speed (airflow speed/wire speed) is 100 to 3,000, a specific phenomenon occurs in which the sheath yarn is rotated while opening the fiber outside the nozzle.

By air velocity herein is meant the velocity of the gas stream ejected from the exit of the suction nozzle along with the wire. This speed can be controlled by the nozzle discharge diameter and the compressed air flow rate. Further, the wire speed can be controlled by the circumferential speed of the roller of the pulling wire after the fluid processing nozzle. The rotation force of the wandering wire is increased or decreased depending on the speed ratio of the airflow to the wire. Therefore, when the staggered point of the target bulky wire is firm, the speed ratio is as close as 3,000, and if the staggering point is to be slow, the opposite is true. As long as the ground is close to 100. This speed ratio can also vary the degree of the staggered point by, for example, intermittently changing the flow rate of the compressed air or changing the speed of the traction roller. On the other hand, when the bulky yarn of the present invention is used for the purpose of repeatedly imparting compression recovery deformation such as a wadding, it is preferred to set the gas flow rate/wire speed to 200 to 2,000. In particular, when a bulky yarn for use in a clothing such as a jacket that is deformed at a high frequency is produced, the airflow speed/wire speed is particularly preferably set to 400 to 1,500 from the viewpoint of imparting appropriate restraint and flexibility.

When the turning force is exhibited, the accompanying airflow is separated from the traveling wire. Here, the turning point 10 of the guide wire path is changed. Specifically, the guide wire path can be changed by a bar wire guide or the like. However, by pulling the wire at a prescribed speed, the sheath wire is swung around the core wire to form a loop. From the viewpoint of the space for inducing the rotation and the diffusion of the airflow ejected from the nozzle to cause the sheath to vibrate, the turning point of the wrap wire is preferably at a position away from the nozzle discharge port. However, the distance between the more suitable nozzle-turn point for producing the bulky yarn of the present invention varies depending on the speed of the jetted air stream, preferably in the jet stream of 1.0 x 10 ^-5 to 1.0 x 10 ^-3 seconds. There is a turning point 10 during the clock tour. In order to achieve equalization with the airflow diffusion and form a staggered point of the core wire and the sheath wire according to the moderate period, the distance between the nozzle and the turning point is preferably present in the jet stream of 2.0×10 ^-5 to 5.0×10 ^-4 seconds. During the walk.

By adjusting the position of the turning point, the staggered dot period of the bulky yarn of the present invention can also be controlled. The staggered point has the function of self-supporting the loop formed by the sheath wire supporting the features of the present invention, and is preferably present in a certain degree of cycle. From this point of view, it is preferred to adjust the turning point in such a manner that the core wire of the bulky yarn and the sheath yarn are interlaced at a distance of 1/mm to 30/mm. If it is within this range, even if the three-dimensional crimping of the sheath filament appears, it is preferable because the loop has a moderate interval. If this viewpoint is promoted, it is preferable that the staggering point adjusts the turning point in a manner of 5/mm to 15/mm.

The processed yarn 11 (Fig. 4) formed by the loops composed of the sheath filaments is capable of exhibiting a fixed shape or a three-dimensional crimp, and is preferably subjected to heat treatment after being wound up or followed by bulking. The processing step of performing the heat treatment after the step of forming the loop is illustrated in FIG.

This heat treatment is performed, for example, by the heater 13 (Fig. 4). The temperature is determined by the crystallization temperature of the polymer used: ± 30 °C. When the treatment is carried out in this temperature range, since the treatment temperature is far from the melting point of the polymer, there is no weld-hardened portion between the sheath wires or the core wires, and there is no foreign matter sensation, and the good touch is not impaired. The heat treatment The heater used in the step may be a general contact or non-contact heater, but a non-contact heater is preferably used from the viewpoint of bulkiness before heat treatment or suppression of deterioration of the sheath filament. Here, the non-contact heater may be, for example, an air-heating heater such as a slit heater or a tube heater; and a steam heater that performs heating using high-temperature steam, a halogen heater that uses radiant heating, or carbon. Heaters, microwave heaters, etc.

Here, from the viewpoint of heating efficiency, it is preferred to use a radiant-heated heater. The heating time can be adjusted, for example, by fixing the fiber structure of the fiber constituting the processed yarn, fixing the shape of the processed yarn, and shortening the appearance of the sheath yarn, etc., and adjusting the characteristics of the processing temperature and time. . The processed yarn which has been subjected to the heat treatment step can be wound up by the winding machine 15 having the tension control function as long as the speed is regulated by the roller 14 (Fig. 4). The winding shape is not particularly limited, and so-called flat bobbin winding or bobbin winding can be formed. Further, in consideration of processing into a final product, a plurality of yarns may be previously formed into a bundle or directly thinned.

The bulky yarn of the present invention is preferably such that the polyfluorene-based oil agent is uniformly attached before and after the heat treatment step. The polyfluorene oxide attached thereto can be appropriately crosslinked by heat treatment or the like to form a film of polyfluorene oxide on the sheath wire and the core wire. Here, the polyoxo-based oil agent can be exemplified by dimethyl polysiloxane, hydrogenated diene methyl polyoxyalkylene, amine polyoxyalkylene oxide, epoxy polyoxyalkylene, and the like. Used alone or in combination. Moreover, in order to form a film uniformly on the surface of the bulky yarn, the oil agent may contain a dispersant, a viscosity modifier, a crosslinking accelerator, an antioxidant, and a flame retardant in the range of no damage and adhesion of the polyfluorene. And antistatic agents. The polyoxo-based oil agent can be used in a solvent-free state or in the form of a solution or an aqueous emulsion. From the standpoint of uniform adhesion of the oil agent, it is preferred to use an aqueous emulsion. The polyfluorene-based oil agent is preferably dispersed by an oil agent guide, a grease roller or a spray, and can adhere 0.1 to 5.0% with respect to the bulky yarn according to the mass ratio. The method is implemented. Preferably, drying is carried out at any temperature and time thereafter to effect a crosslinking reaction. The polyoxo-based oil agent can be attached in multiple times, and it is more suitable to separate the same type of polyoxynium or different kinds of poly-oxygen oxides to make a strong polyfluorene oxide film. By the above treatment, a film of polyfluorene is formed on the bulky yarn, thereby increasing the slipperiness and feel of the bulky yarn, and the effect of the present invention can be further enhanced.

[Examples]

The following examples are given to specifically describe the bulky yarn of the present invention and its effects.

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

A. fineness

The mass of the fiber 100 m was measured, and the fineness was calculated by multiplying by 100 times. This step was repeated 10 times, and the value obtained by rounding off the second decimal place of the simple average value was taken as the fineness (dtex) of the fiber. The monofilament fineness is calculated by dividing the fineness by the number of raw filaments constituting the fiber. In this case, the value obtained by rounding off the second decimal place is also set as the single-filament fineness.

B. Mechanical properties of fibers

The fiber was stretched under the conditions of a test piece length of 20 cm and a tensile speed of 100%/min using a tensile tester "TENSILON" (registered trademark) UCT-100 manufactured by ORIENTEC Co., Ltd. to obtain a stress-strain curve. The load at the time of fracture was read, and the breaking strength (cN/dtex) was calculated by dividing the load by the initial fineness. Further, the strain at the time of the fracture was read, and the value after dividing the length of the sample was multiplied by 100 times to calculate the elongation at break (%). Any value is repeated five times at each level to obtain a simple average of the results obtained. And the value after rounding off the second decimal place.

C. Evaluation of loops (size, staggered point, break point)

A 0.01 cN/dtex load was applied to the wire of the sample in such a manner that it did not relax, and as illustrated in Fig. 2, the wire was placed on a pair of wire guides 4. On the side of the bulky yarn of the hanged wire, the KEYENCE company's microscope VHX-2000 can be used to observe the magnification of the loop of more than 10 places. For the 10 places randomly selected from the image, the image processing software (WINROOF) was used to measure the distance 5 from the center line 3 of the front end of the pile to the apex of the loop (Fig. 2). This operation is to take images of 10 places in total for one piece of processed yarn, and measure the loops of 100 places per one piece of wire in millimeters to the second place of the decimal point. The average value of the numerical value is calculated, and the value obtained by rounding off the second decimal place or less is set as the loop size of the expanded yarn.

In the above 10 images, the sheath wire forming the apex of the loop is formed at a position 1.0 mm or more from the center line 3 of the processed wire, and is a point of intersection with a straight line at a position 0.6 mm from the center line 3 of the processed wire. , count the number of processed wires per 1 mm.

The interlaced points (number/mm) of the total of 10 images were measured, and the average value was rounded off to the nearest decimal point.

As in the above 10 images, 10 break points of the loop of the processed yarn per 1 mm were counted. The breaking point (number/mm) of each of the 100 pile loops of the bulky yarn was measured, and the average value was rounded off to the second decimal place. Here, the sample having a breaking point of less than 0.2/mm was evaluated as being substantially not broken by the sheath yarn (description of each example, comparative example, and "None" in Tables 1, 2, and 3), and 0.2. The number of pieces per mm or more was rated as broken (description of each example and comparative example and "yes" in each table).

D. Evaluation of curling form (with or without three-dimensional crimping, radius of curvature)

In the 10 places randomly selected from the processed yarns, the magnification of the monofilament crimped form was observed by using the microscope VHX-2000 manufactured by KEYENCE Co., Ltd. In the ten images, the core wire 10 and the sheath wire 10 were observed, and when it had a spiral shape (spiral structure), it was judged that it had a three-dimensional crimp structure (description of each example, a comparative example, In the case of Table 1, Table 2 and Table 3, "None" is determined. In the case where this is not the case, the non-crimped structure is determined (the description of each embodiment, the comparative example, and the description of "None" in each table). Further, from the same image, the radius of the bending 6 (Fig. 3) of the crimped monofilament was measured using a video processing software (WINROOF). As described above, 100 pieces of the core wire and 100 pieces of the sheath wire which were randomly selected are measured to the second place of the decimal point in units of millimeters, and the value of the second decimal place of the simple average is rounded off to be a three-dimensional crimp structure. The radius of curvature.

E. Static friction coefficient between fibers

The measurement was carried out in accordance with the method according to JIS L 1015 (2010) using a radar type friction coefficient tester. Further, the samples were evaluated in parallel with the cylinders without performing pretreatment such as opening.

F. Unwinding (inhibition effect of the buckle phenomenon)

The wring of the wound wire of 500 m or more was hung on the creel, and the yarn was unwound at a speed of 30 m/min in the cross-sectional direction of the wringer for 5 minutes, and the yarn jumping and the hooking caused by the fastening phenomenon were visually confirmed. The evaluation was carried out in accordance with the following four stages.

A: No jump wire was found, and it was well unwound.

B: Although some micro jumps were found, they can still be retracted without any problem.

C: Although it is found that there are jump wires and some slight hooks, it can still be unwound.

D: Jumping and hooking occur, and it is impossible to unwind.

G. Touch

A wring having a wound wire of 500 m or more was hung on a creel, and the wire was unwound using a length measuring machine in the cross-sectional direction of the wrap to form a winding form, and a 10 m wound bobbin was formed. A part of the wound tube was fixed to prepare a sample for feeling evaluation. The tactile sensation for gripping the sample was evaluated in accordance with the following four stages.

A: Excellent bulkiness and softness, and excellent hand feeling without foreign body sensation.

B: Good hand feeling with bulkiness and softness.

C: Good hand feeling which is bulky and does not feel the degree of foreign body sensation.

D: There is no bad feeling of bulkiness and feeling of foreign body.

H. Intrinsic viscosity of polymer (IV)

In 10 mL of o-chlorophenol at a temperature of 25 ° C and a purity of 98% or more, 0.8 g of the polymer to be evaluated was dissolved, and the intrinsic viscosity (IV) was determined at 25 ° C using an Oswald viscometer.

[Example 1]

Polyethylene terephthalate (PET: IV = 0.65 dl / g) was melted at 290 ° C, metered and flowed into the spinning assembly, and then concentric from the three slits 17 (width 0.1 mm) shown in Figure 6. The hollow section of the fan-shaped arrangement is discharged through the discharge hole. The discharged air was blown off from one side by a flow of 100 m/min to cool and solidify. The non-ionic spun oil was applied to the yarn, and the undrawn yarn was taken up at a spinning speed of 1500 m/min. Then, the unstretched filaments which were taken up were stretched 3.0 times at an extension speed of 800 m/min between the rolls heated to 90 ° C and 140 ° C to obtain an elongated yarn having a fineness of 78 dtex, a number of strands of 12, and a hollow ratio of 30%. .

The hollow section wire obtained is supplied to each of the two supply rollers by one hollow section yarn, one of which is supplied at a speed of 50 m/min and the other is sucked at a suction nozzle at a speed of 1000 m/min. . In the suction nozzle, the compressed air is ejected at a flow velocity of 400 m/s at 20°, and the wire is ejected from the nozzle along with the airflow in such a manner that the core wire and the sheath wire do not become staggered. The yarns ejected from the nozzles were swept away from the airflow for 1.0 × 10 ^-4 seconds, and the guide wire path was changed by a ceramic guide to form a processed yarn having a loop formed of a sheath wire, and then the traction roller was used at 50 m/min. Traction.

Next, the processed wire was guided to the tube heater via a roller, and heat treatment was performed by heating the air at 150 ° C for 10 seconds to shape the shape of the expanded filament, and the sheath filament was visualized to be three-dimensionally crimped. The bulky yarn was taken up on the reel at 52 m/min using a tension-controlled coiler disposed behind the tube heater.

The bulky yarn obtained in Example 1 was formed by projecting a loop of a sheath yarn having an average of 23.0 mm from the center line of the processed yarn, and the loop was formed at a frequency of 13 pieces/mm. The protruding loops are excellent in size and cycle uniformity.

The sheath wire is formed with a loop, which is fixed by the interlacing of the core wires. The core wire and the sheath wire have a millimeter-scale three-dimensional crimping structure having a radius of curvature of 5.0 mm. The sheath wire does not have a broken place, and the loop is continuously formed. (Fracture place: 0.0)

The sheath wire forming the continuous pile has a three-dimensional crimping structure, the coefficient of static friction between the fibers is 0.3, the unwinding property of the bulked yarn is not problematic, and no entanglement or the like occurs, and the roll can be smoothly rolled from the roll. Unwind the wound on the take-up (unwinding: B). Further, it has a good hand feeling (feel: B) derived from the specific structure of the present invention. The results are shown in Table 1.

[Embodiment 2]

In the bulky yarn to be used in the first embodiment, the polyfluorene-based oil agent containing polyoxyalkylene at a concentration of 8 mass% is 1% by mass based on the amount of the final polyoxydecane attached to the bulky yarn. The spray was spread evenly, and heat treatment was performed at a temperature of 165 ° C for 20 minutes to take a bulky yarn.

In Example 2, by forming a film composed of polyfluorene oxide, the touch feeling is smoother than that of the bulky yarn of Example 1, and the texture with the bulkiness of the bulky yarn has a smooth texture. . The coefficient of static friction between the fibers of the bulky yarn was 0.1, which was found to be lower than that of Example 1. After investigation, the effect of polyfluorene treatment on the morphology of the lofty silk was found to be consistent with the morphological characteristics of Example 1, and other functions were also maintained. The unwinding and feel are also excellent.

In addition to the unwinding property, the bulky yarn is cut into 10 bundles according to a length of 50 cm and formed into a bundle, and the two ends are gripped and rubbed or wiped, but the sheath filaments are not entangled with each other, and the yarn bundle can be drawn from the yarn bundle. A good filament separation of one bulky filament was simply taken out. The results are shown in Table 1.

[Comparative Examples 1 and 2]

In order to verify the effect of the bulking process of the present invention, the same procedure as in the first embodiment was carried out except that a nozzle which changed the injection angle of the compressed air to 90° was used, and the turning point by the ceramic guide was not designed. . However, in Comparative Example 1, according to the same flow rate of compressed air as in Example 1, the core wire and the sheath wire were excessively entangled, and it was difficult to perform stable wire processing due to nozzle clogging, and the gas flow rate was reduced to one half of Example 1. After 200 m/s, the migration of the silk was obtained, and the obtained processed yarn was taken, and the characteristics were evaluated (Comparative Example 1).

The woven yarn composed of the sheath wire at the time point before the heat treatment of the processed yarn of Comparative Example 1 The ring size is smaller than that of the first embodiment and is formed in a very short cycle. Therefore, when the sheath wire is subjected to crimping by heat treatment, although the sheath wire has a loop formed, it lacks bulkiness. If the details of the loops composed of the sheath wires were confirmed, it was found that the loops were uneven in size, and the untreated filaments were found in the processed yarns taken before the heat treatment (fracture "Yes": break point 0.5).

The processed yarn obtained in Comparative Example 1 was subjected to a de-twisting treatment by using a pair of rubber discs (Comparative Example 2). Although the bulkiness was found to be improved, the rupture of the pile was more than that of Comparative Example 1, and the entanglement of the sheath filaments was promoted, and the foreign body sensation was felt during compression. Further, as compared with the case of Comparative Example 1, when the unwinding was performed, there were many cases where the yarn was entangled, and the unwinding property was also lowered. The results are shown in Table 2.

[Comparative Example 3]

Using the processed yarn of Comparative Example 1, a polyfluorination treatment was carried out in the same manner as in the treatment of Example 2 to obtain a processed yarn.

Compared with the first comparative example, although the smoothness of the polypyrene is smooth, the relevant unwinding property tends to be improved, but the morphology of the obtained processed yarn does not change much, and a small-sized loop is formed in a short cycle, and thus the phase is formed. Below the second embodiment, there is a lack of swelling and a poor hand feeling. The results are shown in Table 2.

[Comparative Example 4]

In order to verify the effect of the bulking process of the present invention, except that a nozzle that changes the injection angle of the compressed air to 60° is used, and the ceramic guide is disposed in the discharge hole of the nozzle and then the wire can be discharged, the rest are It was carried out in accordance with Comparative Example 3.

Comparative Example 4 showed a form in which a small-sized pile loop and a larger-sized pile loop were mixed before heat treatment. Although the core wire and the sheath wire are contracted by heat treatment, it appears The three-dimensional crimping structure, but compared to the first embodiment, the overall bulkiness is greatly reduced. In addition, the unevenness of the pile before the heat treatment was promoted, and it was found that some of the loops were loose. Further, since the injection angle of the compressed air is large, the yarn in the nozzle is disturbed and opened, and the monofilament is deteriorated by rubbing the inner wall of the nozzle at a high frequency. Therefore, after the heat treatment, when compared with Comparative Example 3, although some improvement tendency was found, the pile ring break point was partially found. The results are shown in Table 2.

[Examples 3 and 4]

The same procedure as in Example 2 was carried out except that the supply speed was changed to Example 3: core wire 50 m/min, sheath wire 500 m/min, and Example 4: core wire 20 m/min, sheath wire 1000 m/min. Implementation.

In the third embodiment, the loop size was slightly smaller than that of the second embodiment, but the unwinding property was excellent and the hand feeling was good.

In Example 4, compared to Example 2, although the loop size was a large state of 59 mm, the loop was hardly slack. The related hand feeling is excellent in bulkiness and is excellent in unwinding property because it is a structure in which the cutting or the relaxation of the sheath wire is suppressed. The results are shown in Table 3.

[Example 5]

In addition to changing the spinning nozzle used to 6 holes, the yarn was produced so that the hollow ratio was 20%, and the elongation yarn having a single yarn fineness and a hollow ratio was changed (denier 78 dtex, original yarn number 6 (single filament fineness) 13dtex), hollow rate 20%). Except that the stretched yarn was used as a sheath wire, the same was carried out in the same manner as in Example 1.

In the fifth embodiment, the rigidity of the loop is increased by thickening the sheath yarn, and the loft is excellent in rebound feeling. Although the flexibility is lower than that of the first embodiment, it still has sufficient bulkiness. In actual use, by adjusting the number of the yarns, the touch of the product can be adjusted to exhibit a level that does not pose a problem. The results are shown in Table 3.

[Embodiment 6]

In addition, it is changed to a spinning nozzle which is provided with a hole of 24 holes having a hollow cross section arranged in a concentric manner by four slits having a width of 0.1 mm, and a yarn having a single filament fineness and a hollow ratio is changed. (denier 78dtex, number of raw yarns 24 (single filament denier 3.3dtex), medium The void rate is 40%). Except that the stretched yarn was used as a sheath wire, the same was carried out in the same manner as in Example 1.

In the sixth embodiment, the loops formed of the sheath wires are in a self-standing state by the interlacing with the core wires, and the sheath filaments are thinner than in the first embodiment, and thus the bulky yarns having excellent flexibility are obtained. By increasing the number of strands of the sheath filament and reducing the radius of curvature of the crimp (1.5 mm), a number of strands are found when unwinding from the strand, but by adjusting the winding tension of the strand. It can be lifted, and it will not pose a problem when it is actually used. The results are shown in Table 3.

[Embodiment 7]

In the same manner as in the first embodiment, a spinning nozzle which is formed by a circular hole having 12 holes is used, and in the same manner as in the first embodiment, it is cooled and spun from one side by a cooling air of 20 ° C, and other conditions are obtained. The extension wire is equally taken. The crimped form of the drawn yarn after heat treatment exhibited a relaxed form compared to Example 1, and the radius of curvature of the crimp was 28 mm. Except that the extension yarn was used as a sheath filament, it was carried out in accordance with Example 2.

In the seventh embodiment, the crimped form of the sheath filament becomes loose, and the loop of the sheath filament becomes a flocculent form, and an excellent hand feeling with moderate rebound property is obtained. The results are shown in Table 4.

[Embodiment 8]

Except that the round-section fiber used in Example 7 used a sheath yarn in addition to the sheath yarn, the rest was carried out in accordance with Example 7.

In the eighth embodiment, the loops formed by the sheath wires are formed into a floc structure by exhibiting a loosely crimped form of the sheath wires. Further, since the crimped form of the core wire is loose, the constraint of the intersection of the core wire and the sheath wire is weak, and the sheath wire can be laterally moved even when the bulky wire is loaded in the fiber axis direction. In the case of unwinding, the horizontal movement is lower than that in the seventh embodiment, but there is still a situation in which the yarn is entangled, and the level of practical use does not pose a particular problem. The results are shown in Table 4.

[Comparative Example 5]

In order to verify the three-dimensional crimping effect of the core wire and the sheath wire, the core wire and the sheath wire were changed from the conditions of Example 2, and wire processing was performed.

First, the core wire system was changed to the general circular cross-section fiber used in Example 7. The spinneret and the sheath wire were changed to the spinneret having the discharge hole for the hollow section in which the slits were arranged in a concentric manner with three slits having a width of 0.1 mm, and the cooling air velocity was changed to 20 m/ Min. The conditions other than this were taken in the same manner as in Example 1. The core yarn and the sheath yarn have an elongation of about 78 dtex and a number of strands of 12, which are not subjected to the so-called three-dimensional crimping form of the present invention after heat treatment. The processed yarn was taken in accordance with Example 1 except that the extended filaments were utilized.

In Comparative Example 5, the loop was formed outside the nozzle, and the loop was formed, but the sheath was not curled after the heat treatment, and the straight state was maintained. Further, since there was no crimping composed of the sheath yarn, the loop size was uneven as compared with the comparative example 1, and a partially loose loop was exhibited.

In Comparative Example 5, although the sheath filaments did not appear to be three-dimensionally crimped, the loops were formed. When compared with Example 1, the sheath filaments were easily entangled with each other, and a plurality of filaments were entangled during unwinding. Further, the processed yarn unwound from the strand is subjected to compression deformation, and the pile is fixed in a state of permanent fatigue and sliding in the lateral direction, resulting in a decrease in bulkiness. The results are shown in Table 4.

[Comparative Example 6]

Prepare low viscosity PET with IV=0.51dl/g and polytrimethylene terephthalate (3GT) with IV=1.20dl/g. After melting at 280°C, mix into low viscosity PET/3GT=50/50 In the manner of metering, the spinning assembly is combined with the combined composite spinneret to discharge the composite polymer stream. Then, the cooling air of 20 ° C was blown toward the wire at 20 m/min, and the film was cooled and solidified. After the oil agent was applied, the undrawn yarn was taken up at a spinning speed of 1500 m/min. Next, the undrawn yarn thus wound was stretched 3.0 times at an elongation speed of 800 m/min between rolls heated to 90 ° C and 130 ° C, and a stretched yarn of 78 dtex, a number of strands 12, and a side-by-side type composite fiber was taken. The extension wire was used as a sheath wire, and Comparative Example 5 The round cross-section fiber used was used as a core wire, and the other processed yarn was used in the same manner as in Comparative Example 1.

Although the sample of Comparative Example 6 was heat-treated, the sheath filament exhibited a three-dimensionally crimped form, but the radius of curvature was a very fine state of several tens of micrometers, and the sheath filament was found to be broken (with a fracture: 0.4/mm). Further, by exhibiting the crimped form, the loop of the sheath yarn is significantly smaller than that before the heat treatment, and is less than 0.6 mm from the center line of the processed yarn. Therefore, although the tactile sensation of the processed silk exhibits a rubbery unique shape, it does not have the bulkiness and softness of the object of the present invention. Further, since the micron-scale fine crimping, the sheath filament breaks, and the loops are unevenly protruded, the coefficient of static friction between the fibers is high (0.4), and the unwinding property of the strand is difficult to be good. The results are shown in Table 4.

1‧‧‧sheath

2‧‧‧core wire

Claims (7)

A bulky yarn consisting of a synthetic fiber consisting of: a sheath wire having a three-dimensional crimping structure; and a core wire, which is formed by interlacing the sheath wire to fix the sheath wire; Further, the sheath wire does not substantially break and continuously forms a loop. The bulking yarn of claim 1, wherein the single filament fineness ratio (sheath/core) of the core filament and the sheath filament is in the range of 0.5 to 2.0; the intersection of the core filament and the sheath filament is in the fiber axis direction of the expanded filament There is 1/mm to 30/mm; the crimped structure of the sheath wire has a radius of curvature of 2 mm to 30 mm. The bulky yarn of claim 1 or 2, wherein the fibers constituting the bulky yarn have a single yarn fineness of 3.0 dtex or more; and the interfiber friction coefficient is 0.3 or less. The bulking yarn of any one of claims 1 to 3, wherein the core wire has a three-dimensional crimp. The bulking yarn according to any one of claims 1 to 4, wherein one or both of the core yarn and the sheath yarn are hollow cross-section fibers having a hollow ratio of 20% or more. The bulking yarn of any one of claims 1 to 5, wherein the core filament and the sheath filament are the same single-component fibers. A fibrous article, at least a portion of which contains the bulking yarn of any one of claims 1 to 6.