JPH10102339A - Production of combined bundle-spun yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a combined bundle-spun yarn excellent in balance, tenacity, handleability, bulkiness, proper in tension, rigidity and improved in drape properties, comprising filaments and short fibers. SOLUTION: In drafting a silver comprising short fibers having <=100mm average fiber length, bundling the sliver by an air false twisting nozzle to give a bundle-spun yarn, a continuous multifilament is electrically opened so that a continuous filament amounts to 20-80% by a denier ratio based on the yarn and fed to just ahead the upper stream of a front roller and the filaments and the short fibers are fed to the air false twisting nozzle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a continuous filament having uniformity, strength, and good handleability, and a natural feeling of short fibers, bulkiness, warmth, and moderate elasticity, stiffness and drape. The present invention relates to a method for producing a novel composite tied spun yarn having processability.

[0002]

2. Description of the Related Art Until now, polyester filaments have been used in various applications including clothing, taking advantage of their excellent properties. In particular, recently, research targeting silk has been actively pursued for apparel use, and polyester filaments having a texture and properties exceeding silk have been developed in some cases.

[0003] However, since the filaments are generally uniform, they tend to have a monotonous surface, appearance, and touch, and are not suitable for use in the casual field and medium-weight field, and therefore have a non-uniformity in order to impart a natural unevenness to the filaments. Various manufacturing and processing methods such as stretching and (non-uniform) composite (air) processing are being studied. However, uneven drawing of filaments has problems such as unevenness being too noticeable, swelling of spun yarn, lack of warmth, and the tendency to have a metallic cold feel unique to filaments. It is also used in combination with false twisting, but after making it into a multi-layer structure, it is strongly twisted to prevent fluttering, bulging, and it is also done to reduce the weight to give drape properties, but still It was not enough.

On the other hand, filaments and staples are combined in the spinning process, but the productivity is not good when ring spinning is used. In open-end spinning, when compounded with continuous fiber, twisting and untwisting become unstable, and there is a problem in stability of quality. Core yarns are also made using the binding spinning technique, but the staples cover the entire outer layer of the core yarn, so that the appearance is similar to that of spun yarn.
In addition, since the filaments are bundled in the core, they are likely to be displaced and a problem is likely to occur in the processability. Attempts have also been made to open the multifilament and mix it uniformly with staples, but there is a problem that it is easily displaced similarly to the core yarn because it is distributed almost uniformly in the cross-sectional direction and the longitudinal direction.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the prior art, and has as its objects the uniformity, strength, and good handling of continuous filaments. , Short fiber natural feeling, bulkiness, warmth,
It is another object of the present invention to obtain a novel method for producing a composite conjugated spun yarn having a moderate elasticity, drapeability and good processability.

[0006]

Means for Solving the Problems The structure of the method for producing a conjugated spun yarn according to the present invention which can solve the above-mentioned problems is as follows. When bundling with a false twist nozzle to form a bound spun yarn, a continuous multifilament yarn is electrospread so that the continuous filament occupies 20 to 80% in denier ratio with respect to the yarn, and is supplied immediately upstream of the front roller. And supplying the combined short spun fiber to the air false twist nozzle.

In another preferred embodiment, at least the continuous filament is made of polyester.

Further, the continuous filament and the short fiber are practically made of polyester fiber, and the continuous filament has a twist number of substantially 5 to 50 per m,
And the number of filaments is 10 or more, the degree of irregularity is 1.1 or more,
When the filament denier is 1.5 denier or more, the intrinsic viscosity of the latter short fiber is 0.50 or less, and the single fiber fineness is 3.5 denier or less, a more preferable conjugated spun yarn can be obtained.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a composite tie spun yarn obtained by the method of the present invention will be described in detail. First, the composite tie spun yarn of the present invention is a composite tie spun yarn in which continuous filaments and short fibers are composited, and each occupies 20 to 80% in denier ratio. 20% continuous filament
If it is less than 80%, the characteristics of the composite conjugated spun yarn are too large, the unevenness is large, and there is a problem in handling. On the other hand, if it exceeds 80%, the filament is rich and lacks natural feeling, warmth and swelling. The ratio is too small, the binding component is small, and there is a problem in the convergence of the yarn.

Next, it is preferable that the short fibers have a fiber length of 100 mm or less and 40 fibers or more. Fiber length is 100
mm, the end part contributing to bundling is reduced, depending on the number of short fibers, the bundling part is reduced, the strength is reduced, and the fluff ends are reduced, so the spun yarn The sensation is reduced and excluded from the present invention. However, when the fiber length is too short, the component that strongly contributes to the strength becomes small. Furthermore, if the end portion of the fiber is reduced, the bulkiness, swelling and warmness inherent to the spun yarn due to the space of the end portion in the composite bunched spun yarn are lacking, which is not preferable. Further, if the number of fibers is small, the number is preferably 40 or more for the same reason.

Next, the continuous filaments in the composite conjugated spun yarn are distributed almost uniformly in the cross-sectional direction, but it is essential that the continuous filaments be distributed with their positions periodically changed in the longitudinal direction. In the sheath / core yarn, since the sheath component covers the surface, the touch and characteristics of the fiber on the surface are enhanced, and a composite effect on the functional surface can be exhibited, but the touch and texture are those of the surface fiber. However, the uniform mixing in the cross-sectional direction results in a composite of a sheath / core fiber (short fiber, long fiber). In addition, since the long / short fibers are substantially uniformly distributed in the cross-sectional direction, it is possible to prevent irritability due to the difference in dyeing properties between the continuous multifilament and the short fibers.
The entanglement of the short fibers also increases.

Further, in the present invention, it is important that the continuous filaments are distributed at different positions in the longitudinal direction.
That is, when the continuous filaments are located at substantially the same position in the longitudinal direction, the short fibers are easy to move even if they are tied and converged. Movement is hindered at the convergence point, and it is unlikely to become a nep, and good convergence is maintained.

For this purpose, it is preferable that the continuous multifilament substantially consisting of a continuous multifilament has a twist number of 5 to 50 twists per 1 m. At less than 5 times / m, the movement of the focusing section is hardly hindered, and
If the number of turns / m is exceeded, even if an attempt is made to open continuous multifilaments in order to distribute the multifilaments uniformly in the composite bundled spun yarn, the bundle is insufficiently excluded from the present invention due to the bunching of the twist. Further, as another means for providing the converging portion, confounding which inhibits the spread may be provided. However, if the number of entanglements exceeds 50 / m, it is not preferable for the same reason as the above-mentioned twist.

In order to sandwich short fibers between continuous multifilaments, it is preferable that the continuous multifilaments consist of 10 or more filaments. Further, the continuous filament preferably has an irregular cross section having an irregularity of 1.1 or more. This is because the short fibers are easily sandwiched and fixed, and the relatively thick continuous filament has a less slimy feeling in the irregular cross section. For this purpose, a multi-leaf cross section of three or more leaves and a deformed cross section having a plurality of projections in the example shown in FIG. 1 are preferable. At this time, if the degree of irregularity is too small, the effect of the irregularity is not exhibited, so that the degree of irregularity evaluated by the ratio of the circumscribed circle to the inscribed circle is preferably 1.1 or more. Next, the filament denier of the continuous multifilament must be 1.5 denier or more. 1.5
If it is less than denier, the effect of the deformed shape is small, and the elasticity is inferior.

Next, the continuous multifilament used in the present invention is not particularly limited as long as it has been subjected to an openable treatment. Regenerated fibers such as rayon, diacetate and triacetate, and semi-synthetic fibers can be used. First, nylon, polyester, acrylic, promix and the like are preferably used. However, polyester is particularly preferred in terms of handling and texture.

The short fibers used in the present invention are not particularly limited, and natural fibers such as cotton, wool and hemp, synthetic fibers such as polyester, acrylic and nylon, and recycled fibers such as rayon and polynosic are preferably used. Is done. The fiber length is not particularly limited as long as it is within the above range. However, if the fiber length is too long, the number of ends forming the binding portion decreases, which is not preferable.

The yarn properties of the constituent fibers may be ordinary ones, but the continuous multifilament preferably has a strength of at least 3.5 g / d in terms of processability and fabric properties. However, the present invention is not limited to the case where the short fibers have a strong strength due to strong entanglement or twisting.

The thermal shrinkage of the continuous multifilament is set to 10% or more, and the shrinkage of the fabric is mainly caused by the filament, and the continuous multifilament is used to expand by heat, and the filament is expanded from the composite yarn. You can also express a soft and gentle touch.
Also, as for the short fibers, similarly to the continuous multifilaments described above, by using fibers that are elongated by heat, a composite yarn having a large bulge can be obtained.

Next, when the short fibers are made of polyester fibers, the intrinsic viscosity of the fibers is preferably 0.50 or less. The pilling of the spun yarn depends on the intrinsic viscosity, although it depends on the yarn form, and is preferably 0.50 or less, more preferably 0.48 or less.

Further, if the fineness of the short fiber is too large, it is not preferable because the bending moment is large and it is difficult to bind. For the same reason, if the second moment of area is large, such as a hollow or deformed section, the short fiber denier must be thin. In general, the fineness of the short fiber is preferably smaller than the fineness of the continuous multifilament. However, the fineness varies depending on the use, required characteristics, and texture, and is not necessarily limited thereto.
5 denier or less is preferable.

When the continuous multifilaments and / or short fibers are made of polyester fibers, it is preferable that a part or all of the polyester fibers contain a fine pore-forming agent. This is to prevent slime and the like by forming fine pores on the side surfaces of the filament by weight reduction treatment or the like after forming the woven or knitted fabric. Of course, for this purpose, it is preferable that the filaments be present in all the filaments. However, in the case of a yarn in which continuous filaments / short fibers are distributed almost uniformly, such as the composite conjugated spun yarn of the present invention, the composition ratio and the number of micropores are small. , Depending on the size, one of the objects of the present invention,
A gentle dry touch is obtained.

As the fine pore-forming agent for this purpose, those having an optical refractive index substantially the same as that of polyester, such as kaolin and metakaolin, are preferable because they do not cause dullness and can give a deep color, but titanium oxide is also preferable. Further, other fine ceramics which do not impair spinnability and are uniformly dispersed in a polymer can also be used. Further, polyethylene glycol or the like may be mixed.

Next, the continuous filaments and / or short fibers have different thicknesses of the constituent fibers in the longitudinal direction and / or the cross-sectional direction, so that the natural natural feeling and bulkiness of the composite tied spun yarn of the present invention are further promoted. Is done. This is particularly effective when the ratio of short fibers is small.

The polyester fiber referred to in the present invention has an ethylene terephthalate unit as a main constituent unit and is usually a copolyester containing at least 85 mol% of an ethylene terephthalate unit or a mixture of these polyesters. Terephthalic acid, copolymerization components other than ethylene glycol include isophthalic acid, 2-6 naphthalene dicarboxylic acid, adipic acid, hypocinic acid, oxalic acid, diethylene glycol, cyclohexane, dimethanol, P-oxybenzoic acid and derivatives thereof. Can be

The polyester fiber may be a combination of the above-mentioned differently dyeable materials. Other examples include polyester filaments and synthetic short fibers such as acrylic, rayon and polynosic, and natural fibers such as cotton, hemp and wool. Composite tying spinning that can be applied to a wide range of applications, such as emphasizing metachromaticity, emphasizing tone, and further imparting a chambray effect, in addition to obtaining the above properties, by combining fiber with metachromatic fiber You can get yarn.

[0026] Also, unlike a composite spun yarn having a normal twist, the composite wrapped spun yarn has a short wound portion, so that the tied end may return and become free and fall off by ironing. Twisting is also preferred. In this case, the twisting direction is preferably the binding direction (winding direction) because the binding portion returns in the anti-binding direction and the end moves, and the slab or the nep is easily formed. In this case, the twist coefficient (T · D ^1/2 ) is preferably about 2000 or less.

Next, a specific method and apparatus for implementing the present invention will be described. FIG. 2 is a side view of an apparatus for producing a composite tied spun yarn of the present invention, wherein A is a sliver, B is a continuous multifilament, C is a composite tied spun yarn, and sliver A is a back roller 2 and a front roller 4. Receive a prescribed draft between The filament which is supplied to the electrospreading device in a low tension state by the feed roller 9 and is applied with a high voltage of, for example, 1000 Volt or more, and is spread by the repulsive force is fed to the front roller 4.
The filaments are combined with the sliver in a state where they are periodically opened upstream, and the continuous filaments are almost uniformly dispersed in the cross-sectional direction, but are periodically changed and distributed in the longitudinal direction. In addition, 1 is a guide, 3 is a second roller, and 11 and 12 are guides. Composite united spun yarn C
Is twisted and untwisted by the air false twist nozzle 5 through the front roller 4 and the terminal fibers of the free short fibers are bound to obtain a composite bound spun yarn. Next, the cheese is wound around the cheese 8 driven by the roller 7 via the delivery roller 6.

[0028]

Next, the present invention will be described in more detail with reference to examples and comparative examples. However, the present invention is not limited to the following examples, and the scope of the present invention can be adapted to the above and following points. Of course, it is also possible to implement the present invention with appropriate modifications, and all of them are included in the present invention.

The methods for measuring the properties used in the following examples are as follows. (1) Breaking strength, elongation According to JIS-L-1013 (1992), sample length (gauge length) 2 using Tensilon manufactured by Toyo Baldwin Co., Ltd.
An SS curve was measured at 00 mm and a tensile speed of 200 mm / min, and the breaking strength and elongation were calculated. (2) Shrinkage ratio of hot water (SHW) According to JIS-L-1013 (1992), the following was performed. That is, the initial load (1/1 /
10) Take 8 turns of scalpel with g / denier and add (1)
/ 30) g / denier load and the length L ₀ (m
m) is measured. Then the load was removed and (1/1
000) Immerse the scalpel in boiling water for 30 minutes under a load of g / denier. Thereafter, the moss is taken out of the boiling water, and after cooling, a load of (１ ／) g / denier is applied again, and the length L ₁ (mm) at that time is measured. The hot water shrinkage (SHW) is calculated by the following equation. SHW = (L ₀ −L ₁ ) × 100 ÷ L ₀

(3) Degree of Entanglement A yarn of an appropriate length is taken out and suspended vertically by applying a load of (1/10) g / denier to the lower end. Then, an appropriate needle is pierced into the thread, gently lifted, and the distance L ₂ (cm) at which the needle stops is measured 100 times, and the average value L (cm) is obtained and calculated by the following equation. Degree of confounding = 100２ (2 × L)

(4) Worcester Normal (URn) Using a Worcester Evenness Tester Type C manufactured by Zerbeger Co., Ltd., running at a yarn speed of 50 M / min. The measurement and chart are drawn at 2.5 cm / min. Next, the chart was divided into two sections of 2.5 cm, and the highest value (M ₁ ,
M ₂ ) / minimum value (L ₁ , L ₂ ) is read out and calculated from the following equation. URn = [(M ₁ + M ₂ ) + (L ₁ + L ₂ )] / 2

(5) Degree of Deformity A cross section is photographed at a magnification of 100 to 1500 times and is expressed by a ratio of a circumscribed circle to an inscribed circle. (6) Intrinsic viscosity 20 ° C. ± 0.5 ° C. using an equal weight mixture of phenol and tetrachloroethane as a solvent using an Ubbelohde viscometer.
The viscosity ηsp / C is plotted against the solution concentration C under the constant temperature condition of, and extrapolated ηsp / C from C → 0.

Example 1 An MJS binding spinning machine manufactured by Murata Machinery Co., Ltd. was used, and a fiber-spreading device using a high-voltage electrode was mounted just before the front roller. Continuous multifilament B: Toyobo ester 50d-
12f Twisting number: 18 T / m, 0.5% of an amine oxide represented by the following chemical formula 1 (see JP-A-61-12972) was deposited as an oil.

[0034]

Embedded image

Here, R ₁ and R ₃ are an alkyl group having 1 to 4 carbon atoms, and R ₂ is an alkyl group or an alkenyl group having 1 to 18 carbon atoms. High-voltage electrode (described in Japanese Patent Publication No. 52-38144) Applied voltage 7500 V Tension immediately before the electrode 3 g / Y Roving: Toyobo Tough Cell (1.2 denier fiber length 38 m)
m cut) Spinning speed: 30th speed (English) Speed of the draw-out roller 6 150 m / min Air false twist nozzle (Murata Kikai) Air pressure 4.5 k
g / cm ² G The obtained composite tied spun yarn is woven in a twill structure, dyed and finished, and has a warp density of 98 yarns / in and a weft yarn density of 82 yarns / i.
n. The resulting woven fabric had a natural natural feeling of short fibers, bulkiness, warmth, and also moderate elasticity and drape. In addition, continuous multifilaments are almost uniformly distributed in the cross-section direction of the composite bunched spun yarn, but are distributed periodically at different positions in the longitudinal direction, so they are strong against ironing and have good processability. Met.

Example 2 Continuous multifilament B: Toyobo ester 50d /
12f Twisting number: 18T / m Roving: Toyobo ester (0.7 denier fiber length 38m
m cut), intrinsic viscosity: oiling of 0.48 continuous multifilament, production conditions of composite united spun yarn, and fabric standard were the same as in Example 1. The obtained woven fabric had a natural natural feeling of short fibers, bulkiness and warmth, and furthermore, the single fibers of the short fibers were fine, so that a product with a very gentle touch was obtained. Further, since the filament fineness of the continuous multifilament was large, there was also a moderate firmness and firmness. Furthermore,
Pilling that is likely to be a problem with polyester (JISL-
1076-'92A method (measured in accordance with the ICI method)) was 4.5 class without any problem, and the entanglement of the composite bundled spun yarn was similar to that in Example 1 because continuous multifilaments were distributed. On the other hand, there was no problem in the process passability.

Comparative Example 1 Continuous multifilament B: Toyobo ester 50d /
48f, number of twists: 60T / m, roving: Toyobo ester (1.4 denier, fiber length 38m)
m cut), intrinsic viscosity: 0.60, continuous multifilament oiling, production conditions of composite united spun yarn, and fabric standard were the same as in Example 1. The obtained woven fabric had a natural feeling of natural shortness, bulkiness and warmth, but the filament denier of continuous multifilament was thin and firm.
It was inferior in stiffness. In addition, since the intrinsic viscosity is as high as 0.60, the pilling is as poor as 2.0 grade, and the twist number of the polyester multifilament is as large as 60 T / m, so that the opening is poor and the continuous multifilament is hardened and distributed in a core yarn shape. However, there was also a problem in the entanglement of the composite united spun yarn, and the slab / nep was generated by the warper, and the yarn breakage was also a problem.

Comparative Example 2 Continuous multifilament B: Toyobo ester 50d /
18f, number of twists: 3 T / m, roving: Toyobo ester (1.4 denier, fiber length 38 m)
m cut), Intrinsic viscosity: 0.60 Continuous multifilament oiling, production conditions of composite united spun yarn, and fabric standard were the same as in Example 1. The obtained woven fabric had a natural natural feeling, bulkiness and warmth of short fibers, but was inferior in continuous multifilament filament denier and thin and firm. In addition, since the intrinsic viscosity is as high as 0.60, the pilling is as poor as 2.0 grade, and the twist number of the polyester multifilament is 3 T /
m, the spread is almost uniform, and it is almost uniformly distributed in the cross-sectional direction, but it is also almost uniformly distributed in the longitudinal direction.Therefore, there is also a problem with the entanglement of the composite bundled spun yarn. Slabs and neps also occurred, and thread breakage became a problem.

Comparative Example 3 Continuous multifilament B: Toyobo ester 30d / 8
f, number of twists: 10 T / m roving: Toyobo ester (1.4 denier fiber length 38 mm cut), intrinsic viscosity: 0.4
8 Continuous multifilament oiling, production conditions of composite united spun yarn, and fabric standard were the same as those in Example 1. The resulting woven fabric had a short fiber content of 83.1%, which was a spun yarn-like natural feeling, bulkiness and warmth, but had a low ratio of continuous multifilaments and was inferior in firmness and firmness. there were. Further, the number of filaments of the continuous multifilament was as low as eight, and there was also a problem in the entanglement of the composite spun yarn, and there was the same problem as in Comparative Example 2.

Comparative Example 4 Continuous multifilament B: Toyobo ester 150d /
72f, number of twists: 10 T / m, roving: Toyobo ester (1.4 denier, fiber length 38 m)
m cut), intrinsic viscosity: 0.48 The oiling of the continuous multifilament, the production conditions of the composite spun yarn, and the fabric standard were the same as those in Example 1. The obtained woven fabric had a short fiber ratio of 15.3% and had a spun yarn-like natural feeling, bulkiness, no warmth, and a feeling of continuous multifilament. In addition, the average staple is 19 and the number of binding fibers is small, and the thread is strong.
There was also a problem in the convergence, and the same problem as in Comparative Example 2.

[0041]

As described above, according to the method for producing a composite conjugated spun yarn of the present invention, compared to the conventional one, the natural natural feeling of the short fiber, the bulkiness,
A remarkable effect is obtained in that a composite tied spun yarn having warmth, more moderate elasticity, drapability and good processability can be obtained.

[Brief description of the drawings]

FIG. 1 is an example of a cross section of a continuous filament suitably used in the present invention.

FIG. 2 is a schematic side view showing an example of the manufacturing apparatus of the present invention.

[Explanation of symbols]

A: Sliver back roller
Take-up drum B: Continuous multifilament front roller
Feed roller C: Composite united spun yarn Air false twist nozzle
1 Opening nozzle

Claims (3)

[Claims] When a sliver composed of short fibers having an average fiber length of 100 mm or less is drafted and bound by an air false twist nozzle to form a bound spun yarn, a continuous filament with respect to the yarn has a denier ratio of 20 to 80. %, Wherein the continuous multifilament yarn is electrospread so as to occupy the same, and supplied immediately upstream of a front roller, and supplied together with the short fibers to the air false twist nozzle. 2. The method according to claim 1, wherein at least the continuous filament is made of polyester. 3. The continuous filaments and the staple fibers consist essentially of polyester fibers and the former have a twist number of 5 to 50 per m substantially, and the number of filaments is 10 or more, and the degree of irregularity is 1.1 or more. , Filament denier is 1.
The method for producing a composite tie spun yarn according to claim 1, wherein the denier is 5 denier or more, and the intrinsic viscosity of the latter fiber is 0.50 or less and the single fiber fineness is 3.5 denier or less.