JPH08246282A - Long and short conjugate yarn and its production - Google Patents

Abstract

PURPOSE: To obtain a long and soft conjugate yarn having excellent luster, uniformity, warmness and a soft feeling, comprising single yarn constituting filament on the skin layer part of a spun yarn. CONSTITUTION: Polyester filament 4 of 50d/48f is opened between a first and a second nip rollers 5 and 7 through an opening electrode 6. On the other hand, cotton yarn 2 of 80<1> S English count is sent through a third nip roller 8 and both the cotton yarn 2 and the polyester filament 4 are properly arranged in the weight ratio the cotton yarn/the polyester filament of 5/95 to 95/5 and an overfeeding ratio to the filament 4 to the cotton yarn 2 of +0.05 to +20% and fed to a temporary twisting element 9. Both the yarn and the filament are twisted in the direction opposite to that of the cotton yarn 2, untwisted, heat-treated by a heater 11 to form long and short conjugate yarn 1. The conjugate yarn 1 has a shape in which the cotton yarn 2 as a core part is wound with the polyester filament 4, a part of the single yarn constituting the filament 4 exists in an irregular network state or an alternately twisted state and a part of fluff has a projected state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a long / short composite yarn and a method for producing the same. More specifically, the present invention relates to a long-short composite yarn in which single fibers constituting long fibers are present in the outer peripheral portion of a spun yarn arranged on a core, and a method for efficiently producing the long-short composite yarn.

[0002]

2. Description of the Related Art Techniques for combining spun yarn and long fibers into a long-short composite yarn include a method in which a yarn twisting machine is simply twisted to twist both yarns, and a spun yarn and long fibers are introduced into a false twister. A technique for tying both yarns together (Japanese Patent Laid-Open No. 61-245329) and a technique for drafting a short fiber bundle and subsequently twisting and winding (Japanese Patent Publication No. 60-450) have been proposed. .

[0003]

In the conventional technique based on the twisting method in which both yarns are twisted by simply setting the yarn in the twisting machine as described above, when the yarn is twisted in the direction opposite to the twisting direction (lower twist) of the spun yarn, spinning is performed. Since the undertwist of the yarn tends to be untwisted, there is a problem that a squeeze nep and a large amount of fluff are removed during the process, and the productivity is extremely low and the cost is high. If twisted in the same direction as the twist of the spun yarn, strong warp occurs, which is not preferable.

On the other hand, in the method described in JP-A-61-245329 or JP-B-60-450, a spun yarn or a short fiber bundle and an opened long fiber group are fed from the same position at the same speed. To be
There is a problem that it is difficult to form a core-sheath structure yarn, and thus the covering property with the sheath component is insufficient.

An object of the present invention is to provide a long / short composite yarn which can solve these problems and a method for producing the same.

[0006]

The long-short composite yarn of the present invention has the following constitution in order to achieve such an object.

That is, a long-short composite yarn composed of a spun yarn arranged in a core portion and long-fiber yarns present around the spun yarn, wherein some of the single fibers constituting the long-fiber yarn are irregularly meshed. Or alternately twisted on the surface of the spun yarn, and the other part of the monofilament constituting the long fiber is sandwiched between the spun yarn,
Furthermore, a part of the fluff of the spun yarn is present so as to project from the surface of the long / short composite yarn, and the long / short composite yarn is characterized.

The method for producing a long / short composite yarn of the present invention is
It has the following configuration.

That is, when the long fiber yarn is supplied by overfeeding the spun yarn supply speed and the both are made into a composite yarn by the twisting / untwisting action by the false twister, the long fiber yarn is opened. A method for producing a long-short composite yarn, characterized in that the spun yarn is united with the spun yarn in the state, then twisted in a direction opposite to the twist direction of the spun yarn, untwisted, and then wound.

The present invention will be described in more detail below.

The long fibers constituting the long-short composite yarn of the present invention are
Any of synthetic fibers such as polyester, polyamide, polyacrylonitrile, etc., cellulosic regenerated fibers, and cellulosic semi-synthetic fibers can be applied, but it is necessary to use multifilament yarns.
Furthermore, there are some restrictions on the properties of the single fibers constituting the long fiber yarn, that is, the single yarn fineness, the cross-sectional shape, and the presence or absence of crimping (crimping provided by post-processing or latent crimping provided by the fiber structure). Not a thing.

The monofilament fineness of the long fiber yarn is 0.05 from the viewpoint of preventing the filament breakage and the filament breakage caused by rubbing during the process passage, and obtaining an appropriate texture.
It is preferably not less than denier and not more than 10 denier,
More preferably, it is 0.1 denier or more and 6 denier or less.

The physical properties such as strength and elongation and shrinkage, and the dyeability are not restricted.

On the other hand, the spun yarn that constitutes the long-short composite yarn of the present invention refers to a short fiber yarn (single yarn) bundled by actual twist, specifically, 100% natural fiber and 100% synthetic fiber. ,
A mixed yarn of natural fibers, synthetic fibers and semi-synthetic fibers may be used, and is not limited in any way. The thing using functional fiber etc. can also be applied. This spun yarn must be a twisted yarn in a fixed direction. The thickness of the spun yarn is preferably 8 ^s to 200 ^{s, in} terms of British cotton count, from the viewpoint of allowing long fibers to exist on the surface of the spun yarn. More preferably, it is 20 ^s to 80 ^s .

Next, the long-short composite yarn of the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a schematic diagram for explaining the long-short composite yarn of the present invention. As shown in FIG. 1, in the long-short composite yarn of the present invention, spun yarn 2 is arranged in the core portion, and the single filament 3 of the long fiber yarn 4 is formed so as to envelop the outer peripheral portion of the spun yarn 2. It regularly exists in the form of a mesh (b) and alternating twists (a). It should be noted that K shown in FIG. 1 is the fluff of the spun yarn 2.

In the long-short composite yarn of the present invention, a part of the monofilaments constituting the long-fiber yarn are irregularly present in the form of a mesh or alternating twists on the surface of the spun yarn, so that the fluff binding effect is great. The fluff detachment that tends to occur during the process is greatly reduced.
Further, when it is made into a fiber product, it has excellent gloss and uniformity of a product that long fibers have, and further has excellent anti-pill performance.

On the other hand, if some of the monofilaments constituting the long-fiber yarn are irregularly meshed or alternately twisted and do not exist on the surface of the spun yarn, fluffing becomes prominent, causing yarn breakage and product damage. However, the product appearance is inferior in terms of uneven glossiness, uneven texture, and pill resistance.

Further, in the long-short composite yarn of the present invention, the other part of the monofilament constituting the long fiber is sandwiched between the spun yarns, which means that the anchor effect, that is, the long fiber and the spun yarn are firm. The long fibers mainly arranged on the surface do not shift even if they pass through the process, and they are excellent in resistance to squeeze and in maintaining the yarn form.

On the other hand, when the other part of the monofilament constituting the long fiber is not sandwiched between the spun yarns, the yarn form collapses due to various external forces when passing through the process, resulting in poor coverage.

Further, in the long / short composite yarn of the present invention, a part of the fluff of the spun yarn is present so as to protrude from the surface of the long / short composite yarn, so that a soft touch feeling and a warm feeling are brought about.
Moreover, it is excellent in wearing comfort without feeling stuffy.

Next, the method for producing the long-short composite yarn of the present invention will be described.

In the production method of the present invention, long fibers are supplied in an opened state while giving a relative speed difference between the yarns of the long fiber yarns and the spun yarns, and the long and short composite yarns are processed by false twisting. It is what

That is, the supply speeds of the respective components of the long fiber yarn and the spun yarn are set to give a relative difference in the supply speed so that the spun yarn is positively arranged on the core portion, and the long fiber yarn components are The spun yarn is fed at an overfeed rate with respect to the feeding rate. The overfeed rate (indicated by + in front of the number) is preferably in the range of +0.05 to + 20% from the viewpoint of forming a long and short composite yarn having excellent coverage and smooth like a rod yarn.

Next, the twisting direction of the twisting region when the yarns of both the long fiber yarn and the spun yarn are introduced into the false twister and united, the viewpoint is to make the long and short composite yarn excellent in covering property. Therefore, the reverse twist direction of the spun yarn is opposite, and the number of twists in the twisting area is 50
% Or more is preferable. More preferably, the twist number exceeds 100%.

FIG. 2 is an explanatory view showing an example of a process mode for producing the long-short composite yarn of the present invention.

In FIG. 2, the long-fiber yarn 4 is guided to the fiber-spreading electrode 6 following the first nip roller 5, and the yarn 4 is spread into units of single filaments 3. In the production method of the present invention, it is important to open the long fiber yarn by a desired means such as electrostatic opening, opening by frictional charging, or physical opening means.

Then, it is sent out from the second nip roller 7. The yarn 4 is preferably in a relaxed state between the first nip roller 5 and the second nip roller 7. If expressed by the overfeed rate, it is +0.001 to + 10%. If it exceeds this range, opening is unstable, which is not preferable.

The overfeed rate α here is calculated as follows.

That is, α [%] = 100 × (V ₂ −V
₁ ) / V ₂ where V ₁ is the surface speed of the first nip roller 5 [m /
Min], V ₂ is the surface speed of the second nip roller 7 [m /
Minute].

On the other hand, the spun yarn 2 is guided to the third nip roller 8 and sent out. Here, the speed relationship between the nip roller 7 and the nip roller 8 is faster than the nip roller 7 that supplies the spun yarn 2 when the opened long fiber 4 is supplied. If this speed difference is indicated by the overfeed rate, For example, the range of +0.05 to + 20% is preferable, and the long / short composite yarn 1 of the present invention, that is, the single fiber 3 of the long fiber 4 opened on the outer peripheral portion of the spun yarn 2 is irregular only by providing this overfeed rate. In particular, it adopts a structure in which a mesh portion and alternating twists are arranged, and is an important technical element essential for determining the yarn structure of the present invention.

The overfeed rate β here is calculated as follows.

That is, β [%] = 100 × (V ₄ −V
₃ ) / V ₄ Here, V ₃ is the surface speed of the third nip roller 8 [m /
Min], V ₄ is the surface speed of the fourth nip roller 10 [m /
Minute].

Next, the filament yarn 4 and the spun yarn 2 which are sent out at a speed difference are supplied to the false twister 9. At this time, the twisting direction of the twisting region is opposite to the twisting direction of the spun yarn 2. The twist density in the twisting region is not particularly limited, but it is preferable that a part of the single fiber 3 of the long fiber 4 is sandwiched inside the spun yarn 2 which is being untwisted. In that sense, it is preferable that the spun yarn 2 has a lower twist number of 20% or more. When the monofilaments 3 of the long fiber yarns 4 in this region are twisted and united with the spun yarn 2, the irregular starting point of the monofilaments 3 causes a situation in which the filaments are not untwisted in an orderly manner, Therefore, the monofilaments 3 are arranged irregularly on the surface layer of the spun yarn 2 in the form of a mesh or alternate twists. Next, it is sent out from the fourth nip roller 10.
The feed rate γ of this zone (between the second nip roller 7 and the fourth nip roller 10) is -5 to + in the following equation.
It is preferably 20%.

That is, γ [%] = 100 × (V ₅ −V
₂ ) / V ₅ where V ₂ is the surface speed of the second nip roller 7 [m /
Min], V ₅ is the surface speed of the fifth nip roller 10 [m /
Minute].

Further, in the manufacturing method of the present invention, as shown in FIG. 2, a fifth nip roll 12 is provided, if necessary.
In the meantime, the heater 11 can also perform heat treatment for the purpose of shrinkage ratio control, torque fixing control, yarn leveling control, and yarn glossiness control. In this case, the feed rate during heat treatment may be overfeed or underfeed. The feed rate δ here is calculated as follows.

That is, δ [%] = 100 × (V ₅ −V
₄ ) / V ₅ where V ₄ is the surface speed of the fourth nip roller 10 [m
/ Min], V ₅ is the surface speed of the fifth nip roller 12 [m
/ Min].

Subsequently, the long / short composite yarn 1 is wound up by the sixth take-up roll 13.

Here, although the feed rate is not specified, it may be wound so that the winding shape is good and there is no problem in unwinding.

FIG. 3 is an explanatory view showing an example of a state in which the opened long fiber yarn and the spun yarn are united and twisted together. FIG.
Shows a mode in which the spun yarn 2 and the single fiber 3 of the opened long fiber 4 are united and twisted by the false twister 9. In FIG. 3, a nip point AA ′ where the long fiber 4 is nipped by the first nip roller 5, a nip point BB ′ where the spun yarn 2 is nipped by the third nip roller 8, and the length of the invention. Nip point C- of the fourth nip roller 10 that sends out the composite yarn 1
C'is shown respectively. As can be seen from this explanatory view, the twisting start points of the single fibers 3 constituting the long fibers 4 are not the same. Such irregular twisting is performed by false twisting 9
In the untwisted region, that is, in the untwisted region, the untwisted or alternating twisted form is effectively exerted.

The yarn of the present invention may be used by applying a desired twist number from sweet twist to strong twist, if necessary.
For the purpose of imparting crimp to the long-short composite yarn of the present invention, temporary twisting may be performed. In addition, entanglement treatment may be performed for the purpose of improving the yarn converging property.

[0042]

EXAMPLES The present invention will be described in more detail below with reference to examples.

[Example 1] Cotton yarn of 1125 T / m twist and Z twist of 80 ^s (British cotton count) and polyester filament 5
Using 0 denier 48 filament yarn as a raw material, long fibers were electrostatically opened under overfeed, and cotton yarn was twisted with a false twist. An air swirling nozzle was used as the false twister, a pneumatic pressure of 3.0 kgf / cm ² was set, and the speed of each nip roll was set as follows to produce a long-short composite yarn.

First nip roll: 100.0 [m / min] Second nip roll: 99.5 [m / min] Third nip roll: 96.0 [m / min] Fourth nip roll: 95.0 [m / min] The obtained long / short composite yarn was a long / short composite yarn in which fine mesh filament filaments of approximately 1 denier were arranged on the surface of the cotton yarn, and irregular mesh portions and alternating twisted portions were arranged on the yarn surface. This long / short composite yarn has good yarn quality, has the excellent luster of long fibers, and has excellent water absorption properties that cotton originally possesses.
The yarn had a moisture absorbing function and cotton fluff protruding from the surface of the long / short composite yarn.

This long / short composite yarn is made up of 140 warps / inch,
When we made 95 wide / inch wide cloth, in addition to exhibiting a soft texture, it has a smooth luster surface and a glossy finish, and it is rich in drape, and is comfortable to wear and esthetics to wear. It became an excellent fabric. In addition, ICI
The pilling performance by the method of 10 hours was 5th grade, which was extremely excellent.

[Comparative Example 1] The same long-fiber yarn and spun yarn as in Example 1 were set in an ordinary ring twisting machine, and the two were twisted together without any difference in yarn length, so-called intertwisted yarn (650 T / m, S). Twist)
Was produced. The obtained yarn has a large twist on the long fiber side, but on the cotton yarn side, the lower twist is untwisted, so that the yarn is stretched in the opposite direction, resulting in a wavy form in the yarn axis direction. It became the heddle thread presented.

When this yarn was woven with the same woven design as in Example 1, it was a fabric having a core and a rough texture, having serpentine spots and no gloss, and having no drape property. It was also stiff in terms of wearing and became extremely uncomfortable to the touch. In addition, when the pilling performance was evaluated by the ICI method for 10 hours, the grade was 1-2 and was a failure level.

[Example 2] 796 T / m twist, 4 Z twists
0 ^s (English cotton count) 100% polyester (1.2
(5d × 44 mm) spun yarn and polyester filament 50 denier 48 filament yarn were used as feed materials, the filament was electrostatically opened under overfeed, and the cotton yarn was twisted with a false twist. As the false twister, an air swirling nozzle was used, a pneumatic pressure was 3.50 kgf / cm ² , and the speed of each nip roll was set as follows to produce a long-short composite yarn.

First nip roll: 150 [m / min] Second nip roll: 149 [m / min] Third nip roll: 143 [m / min] Fourth nip roll: 142 [m / min] The obtained long-short composite yarn is The single-filament filament fine yarn having a fineness of about 1 denier was irregularly arranged in the surface layer of 100% polyester spun yarn to form an envelop type. This long / short composite yarn is a yarn that has good yarn quality and has the excellent luster of long fibers, and also has the excellent water-absorbing / moisture-absorbing functions that cotton originally possesses and cotton fluff protruding from the surface of the long / short composite yarn. there were.

This long / short composite yarn is made up of 120 warps / inch,
When we made a horizontal woven fabric of 85 horizontals / inch, it has a unique soft texture of long fibers and a refined luster, and it has excellent drapeability and also has the comfort of short fibers. The fabric has excellent aesthetic appeal. The pilling performance by the ICI method for 10 hours was 4-5 grade, which was extremely good.

[Comparative Example 2] The same long-fiber yarn and spun yarn as in Example 2 were set in an ordinary ring twisting machine, and both were twisted without any difference in yarn length, so-called intertwisted yarn (537T / m, S). Twist)
Was produced. The obtained yarn has a large twist on the long fiber side, but on the cotton yarn side, the lower twist is untwisted, so that the yarn is stretched in the opposite direction, resulting in a wavy form in the yarn axis direction. It became the heddle thread presented.

When this yarn was woven by the same woven fabric design as in Example 1, it was a fabric having a core and a coarse and hard texture, having serpentine spots and no gloss, and having no drape property. It was extremely uncomfortable to the touch even when it was worn. The pilling performance by the ICI method for 10 hours was grade 1 and was unacceptable.

[Embodiment 3] Number of twists of 870 T / m, 4 of Z twists
5 ^s (English cotton count) 50% polyester (1.25
d × 44 mm) and upland cotton 50% cotton mixed spun yarn and polyester filament 50 denier 24 filament yarn are used as feed materials, and the filament is electrostatically opened under overfeed and the cotton yarn is false twisted. Twisted. As the false twister, a pin winding type false twist spindle was used and rotated at 180000 rpm. The speed of each nip roll was set as follows to produce a long-short composite yarn. In this example, a fifth nip roll was provided after the fourth nip roll for the purpose of suppressing the shrinkage ratio of the long and short composite yarns, and a heater was provided therebetween. The heater length was 50 cm and the heater temperature was 210 ° C.

First nip roll: 200 [m / min] Second nip roll: 198 [m / min] Third nip roll: 193 [m / min] Fourth nip roll: 191 [m / min] Fifth nip roll: 190 [m / Min] Heater length between the 4th nip roll and the 5th nip roll x temperature: 50cm x 220 ° C The obtained long / short composite yarn has irregular fine filament fine filaments of approximately 1 denier on the surface layer of 100% polyester spun yarn. It was a type that was arranged by means of a mesh-like portion and alternating twists. This long / short composite yarn is a yarn that has good yarn quality and has the excellent luster of long fibers, and also has the excellent water-absorbing / moisture-absorbing functions that cotton originally possesses and cotton fluff protruding from the surface of the long / short composite yarn. there were.

This long / short composite yarn is used for 120 warps / inch,
When we made a horizontal woven fabric with 85 horizontals / inch, it was a fabric with soft texture, good luster, excellent drape, and comfort and aesthetics. In addition, ICI
The pilling performance by the method for 10 hours was 4-5 grade, which was a very good result.

[Comparative Example 3] The same filament yarn and spun yarn as in Example 4 were set in an ordinary ring twisting machine, and both were twisted without any difference in yarn length to prepare a so-called mixed twisted yarn. The obtained yarn has a large twist on the long fiber side, whereas the cotton yarn side is stretched in the opposite direction because the lower twist is untwisted.
As a result, the yarn was wavy in the axial direction.

When this yarn was woven with the same woven design as in Example 1, a fabric having a core and a rough and hard texture, having serpentine spots and no gloss, and having no drape property was obtained. It was extremely uncomfortable to the touch even when it was worn. In addition, the pilling performance by the ICI method for 10 hours was 1-2, which was unacceptable.

[0058]

EFFECTS OF THE INVENTION According to the present invention, since the single fiber constituting the long fiber is present on the surface of the spun yarn on the surface of the spun yarn, it has a fluffing effect and is excellent in process passability. Of course, due to the structure in which both fiber bundle components are layered within the yarn cross section, the excellent luster and uniformity of long fibers are fully exhibited on the yarn surface, while at the same time the excellent unevenness and warmth of short fibers, The soft feeling is exhibited inside the thread. Therefore,
It is a perfect material for fabric design that requires high sensitivity, high texture and high functionality. In particular, if the single yarn fineness of the long fibers is set to 1 denier or less, the effect of producing a feeling of fine hair such as feathers is obtained.

Further, since the long-short composite yarn of the present invention does not use the real twist having low productivity, extremely high productivity can be secured. Therefore, an inexpensive long-short composite yarn can be provided.

[Brief description of drawings]

FIG. 1 is a schematic diagram illustrating a long-short composite yarn of the present invention.

FIG. 2 is an explanatory view showing an example of a process mode for producing the long-short composite yarn of the present invention.

FIG. 3 is an explanatory diagram showing an example of a state in which an opened long fiber yarn and a spun yarn are combined and twisted.

[Explanation of symbols]

 1: Long fiber envelope type long and short composite yarn of the present invention 2: Spun yarn 3: Single filament of long fiber yarn 4 4: Long fiber yarn 5: First nip roller 6: Opening electrode 7: Second nip roller 8: Second 3 nip roller 9: false twister 10: fourth nip roller 11: heater 12: fifth nip roller 13: take-up roller b: a portion in which monofilaments of long fibers are arranged in an alternating twisted pattern b: of long fibers Portion where single fibers are arranged in a mesh K: Fluff of spun yarn 2

Claims (5)

[Claims] 1. A long-short composite yarn comprising a spun yarn arranged in a core portion and long-fiber yarns present around the spun yarn, wherein some of the single fibers constituting the long-fiber yarn are irregularly meshed. And alternate twists are present on the surface of the spun yarn, and another part of the monofilaments constituting the continuous fiber is sandwiched between the spun yarn, and further, a part of the fluff of the spun yarn is a long-short composite yarn. A long-short composite yarn characterized by being present so as to protrude from the surface. 2. The long / short composite yarn according to claim 1, wherein the weight ratio of spun yarn / long fiber yarn constituting the long / short composite yarn is 5/95 to 95/5. 3. When the long fiber yarn is supplied by over-feeding with respect to the spun yarn supply speed and the both are made into a composite yarn by a twisting / untwisting action by a false twister, the long fiber yarn is opened. A method for producing a long-short composite yarn, comprising: combining the spun yarn in a state, then twisting in a direction opposite to the twisting direction of the spun yarn, untwisting, and winding. 4. A twisted yarn is twisted in a direction opposite to the twisted direction,
The method for producing a long-short composite yarn according to claim 3, wherein a heat treatment is performed after the untwisting. 5. The method for producing a long-short composite yarn according to claim 3, wherein the overfeed ratio of the long-fiber yarn to the spun yarn supply rate is +0.05 to + 20%.