LONG-SHORT COMPOSITE YARN HAVING EXCELLENT UNIFORMITY

Abstract

The present invention relates to a long-short composite yarn comprising short fibers and long fibers and, more particularly, to a long-short composite yarn that has excellent uniformity by having the short fibers inserted into the long fibers.

Description

TECHNICAL FIELD

The present disclosure relates to a long-short composite yarn including short fibers and long fibers, and more particularly, to a long-short composite yarn that has excellent uniformity by having the short fibers inserted into the long fibers.

BACKGROUND ART

A long-short composite yarn relates to a composite yarn that includes both long fibers having a long length and short fibers having a short length. As technology has advanced, long-short composite yarns have been developed due to an increase in the industrial fields of using fibers and the expansion of fiber functionality according to the tastes of various consumers.

The long-short composite yarn has the advantage of being able to use the respective strengths of long fibers and short fibers, and various structures, shapes, and manufacturing methods of the long-short composite yarn have been studied. For example, representative examples of conventional manufacturing methods of the long-short composite yarn include composite yarns manufactured through siro-spun or siro-fil methods. The siro-spun method has the advantage of being able to handle various types of fiber mixtures and thus manufacture long-short composite yarns with various properties, but has the disadvantage of lower fiber efficiency when the fibers may be physically clumped or manufactured irregularly. In addition, the siro-fil method has the disadvantage of being difficult to be applied to various fiber mixtures, and thus being difficult to manufacture various types of long-short composite yarns.

As such, the conventional technology has problems in that the formability of composite yarns is deteriorated, or the types of fibers that may be used are limited depending on the shape or manufacturing method of the composite yarn, and in particular, there is a problem of losing single fibers included in the long-short composite yarn.

In addition, in order to respond to the recent demand for eco-friendly recycling markets, in the case of using fibers made by regenerating waste fabrics, the length of the regenerated fibers is short and thus there is a problem in that it is difficult to apply conventional ring-spinning when manufacturing composite yarns using the regenerated fibers.

Accordingly, the present inventors developed a long-short composite yarn having a novel bonding form while conducting research to solve the above-mentioned problems, and found that in the case of a composite yarn having such a bonding form, short fibers are firmly bonded into long fibers so as not to be lost, and then completed the present disclosure.

In this regard, Korean Patent Registration No. 10-2561648 discloses a ring twisting long-short composite yarn and a manufacturing method thereof.

DISCLOSURE

Technical Problem

The present disclosure has been made to solve the problems of the related art, and an object of the present disclosure is to provide a long-short composite yarn including a short-fiber portion inserted into a long-fiber portion.

Technical Solution

As a technical means for achieving the aforementioned technical problem, one aspect of the present disclosure provides

• • a long-short composite yarn including: a short-fiber portion consisting of a plurality of short fibers adjacent to each other; and a long-fiber portion consisting of a plurality of long fibers formed by twisting on an outer peripheral surface of the short-fiber portion.

The short fibers may include a material selected from the group consisting of vegetable fibers, animal fibers, mineral fibers, regenerated fibers thereof, and combinations thereof.

The plant fibers may include a material selected from the group consisting of cotton fiber, cellulose fiber, hemp fiber, pineapple fiber, coffee bean fiber, banana fiber, ramie fiber, corn silk fiber, bamboo fiber, and combinations thereof, the animal fibers may include a material selected from the group consisting of leather fiber, wool fiber, cashmere, camel hair fiber, mohair fiber, alpaca fiber, silk fiber, and combinations thereof, and the mineral fibers may be mica fiber or glass fiber.

The long fibers may include a material selected from the group consisting of polyester-based fibers, polyamide-based fibers, polyurethane-based fibers, polyurea-based fibers, polyacrylic-based fibers, polyvinyl alcohol-based fibers, polyvinyl chloride-based fibers, polyvinylidene chloride-based fibers, polypropylene-based fibers, polyethylene-based fibers, polystyrene-based fibers, polyfluoroethylene-based fibers, biodegradable fibers, and combinations thereof.

The length of the short fibers may be 5 mm or less.

The long-short composite yarn may have uniformity U % of less than 2.

Advantageous Effects

According to the present disclosure, the long-short composite yarn includes short fibers, but can be used as a composite yarn because the short fibers are firmly bonded into the long fibers.

In addition, since the short fibers are inserted into the long fibers, the composite yarn can prevent the loss of the short fibers, and have excellent uniformity.

In addition, the composite yarn can be manufactured as composite yarns with various feels and effects by using various types of short fibers.

Finally, the composite yarn may have excellent tensile strength and elongation even by including short fibers, and thus can be widely used as a raw material for automobile interior materials, shoes components, or laminated and processed fabrics, such as rear surfaces of coated fabrics and non-woven intermediates.

DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic diagram showing a long-short composite yarn according to one embodiment of the present disclosure.

FIGS. 2 and 3 are photographs showing a long-short composite yarn according to one example of the present disclosure, respectively.

FIGS. 4 to 6 are SEM photographs showing a long-short composite yarn and a spun yarn according to one Comparative Example of the present disclosure, respectively.

BEST MODE

Hereinafter, Examples of the present disclosure will be described in detail to be easily implemented by those skilled in the art. However, the present disclosure may be implemented in various different forms and is not limited to Examples described herein.

Example 1. Manufacturing of Long-Short Composite Yarn

In order to manufacture a long-short composite yarn according to the present disclosure, recycled polyethylene terephthalate (PET) having a fineness of 420 denier (D) was used as long fibers and leather fibers having an average length of 1 mm were used as short fibers.

First, the leather fibers were injected into the long fibers to be bonded with each other. More specifically, the leather fibers were injected through a short fiber injection device, and the leather fibers were quantitatively supplied to a 2,000 rpm cylinder at a supply rate of 0.3 g/min/weight through a 70 rpm gear pump. At this time, air was supplied to the surface of the cylinder through a first air knife to remove clumped leather fibers attached onto a cylinder wire and impart uniform dispersion of the leather fibers in the long fibers. At this time, the air pressure of the first air knife was 1.5 kgf/cm².

Thereafter, the long fibers dispersed with the leather fibers passed through a second air knife to remove the clumped leather fibers from the leather fibers attached onto the surface of the long fibers and to be uniformly bonded with the leather fibers. At this time, the second air knife was designed to be positioned at the upper and lower portions of the long fibers bonded with the leather fibers, and the air pressure was 1.5 kgf/cm².

Next, the fibers passed through a winder to impart twists to the long-short composite yarn, and then were wound to obtain a long-short composite yarn. At this time, the winding speed was 15 m/min, twist per meter (TPM) was 600, and the weight ratio of leather fibers contained in the long-short composite yarn was 30 wt %.

Example 2. Manufacturing of Long-Short Composite Yarn

A long-short composite yarn was manufactured using the same method as in Example 1 above, except that leather fibers having an average length of 3 mm were used as short fibers.

Example 3. Manufacturing of Long-Short Composite Yarn

A long-short composite yarn was manufactured using the same method as in Example 1 above, except that leather fibers having an average length of 5 mm were used as short fibers.

Hereinafter, the conditions for manufacturing the long-short composite yarns of Examples 1 to 3 were summarized and shown in Table 1.

	TABLE 1
	Exam-	Exam-	Exam-
	ple 1	ple 2	ple 3
Long fiber	Type	Recycled PET
	Fineness (D)	420	420	420
Short fiber	Gear pump rotation rpm	70	70	70
	Cylinder rotation rpm	2,000	2,000	2,000
	Average length (mm)	1	3	5
	Supply amount	0.3	0.3	0.3
	(g/min/weight)*
Air knife	Air pressure (kgf/cm2)	1.5	1.5	1.5
Winding	Winding speed (m/min)	15	15	15
	Twist per meter (TPM)	600	600	600
Composite	Fineness (D)	600	600	600
yarn	Short fiber content (wt %)	30	30	30
*Added amount when manufacturing one composite yarn, in the case of 12 weights, long fibers and short fibers were added 12 times.

Comparative Example 1. Manufacturing of Long-Short Composite Yarn

A long-short composite yarn was manufactured using the same method as in Example 1 above, except that leather fibers having an average length of 7 mm were used as short fibers.

Comparative Example 2. Manufacturing of Long-Short Composite Yarn

A long-short composite yarn was manufactured using the same method as in Example 1 above, except that leather fibers having an average length of 11 mm were used as short fibers.

Comparative Example 3. Manufacturing of Spun Yarn

A spun yarn was manufactured using recycled PET staple fibers (SFs) having a fineness of 1.4 denier (D) and a length of 38 mm and leather fibers having an average length of 12 mm.

At this time, the spun yarn was manufactured using a conventional spinning process (blending-carding-drawing-roving-spinning), and the content of the recycled PET SFs was 70 wt %, and the content of the leather fibers was 30 wt %.

Hereinafter, the conditions for manufacturing the long-short composite yarns of Comparative Examples 1 and 2 were summarized and shown in Table 2.

	TABLE 2
	Comparative	Comparative
	Example 1	Example 2
Long fiber	Type	Recycled PET	Recycled PET
	Fineness (D)	420	420
Short fiber	Gear pump	70	70
	rotation rpm
	Cylinder rotation	2,000	2,000
	rpm
	Average length	7	11
	(mm)
	Supply amount	0.3	0.3
	(g/min/weight)*
Air knife	Air pressure	1.5	1.5
	(kgf/cm2)
Winding	Winding speed	15	15
	(m/min)
	Twist per meter	600	600
	(TPM)
Composite	Fineness (D)	600	600
yarn	Short fiber	30	30
	content (wt %)
*Added amount when manufacturing one composite yarn, in the case of 12 weights, long fibers and short fibers were added 12 times.

Experimental Example 1. Confirmation of Appearance of Long-Short Composite Yarns

The photographs of the long-short composite yarn manufactured in Example 1 were shown in FIGS. 2 and 3.

As shown in FIGS. 2 and 3, in the case of the long-short composite yarn manufactured according to Example 1 of the present disclosure, it was confirmed that the short fibers were not lost, but firmly bonded to the long fibers.

In addition, it was confirmed that since the short fibers were inserted into the twisted long fibers, only the long fibers were observed on the outer surface, but no short fibers were observed.

Meanwhile, cross-sectional and lateral SEM photographs of the long-short composite yarns manufactured in Comparative Examples 1 and 2 were shown in FIGS. 4 (Comparative Example 1) and 5 (Comparative Example 2), respectively, and cross-sectional and lateral SEM photographs of the spun yarn manufactured in Comparative Example 3 were shown in FIG. 6.

As shown in FIGS. 4 and 5, it was confirmed that in the long-short composite yarns manufactured according to Comparative Examples 1 and 2, the short fibers all were not inserted into the long fibers, and thus some of the short fibers were exposed to the outside of the long fibers. It was analyzed that the long-short composite yarns according to Comparative Examples used short fibers having longer lengths than the short fibers of the long-short composite yarns according to Examples.

In addition, as shown in FIG. 6, it was confirmed that in the spun yarn manufactured according to Comparative Example 3, the leather fibers were not inserted into the recycled PET fibers, similarly to the long-short composite yarns according to Comparative Examples 1 and 2.

Experimental Example 2. Confirmation of Uniformity of Long-Short Composite Yarns

The uniformity (U %) of the long-short composite yarns and the spun yarns manufactured in Examples and Comparative Examples was measured, and the results thereof were shown in Table 3 below. At this time, the uniformity (U %) was measured using a uniformity measuring device (yarn speed: 100 m/min, measurement range: 25%, measurement time: 3 min) from Keisuke Co., Ltd. in Japan. Meanwhile, when the uniformity (U %) shown in Table 3 below had a value of 1.2 or less, it was determined to be good, and when the uniformity (U %) had a value of 2.0 or more, it was determined to be poor.

	TABLE 3
	Ex. 1	Ex. 2	Ex. 3	Com. Ex. 1	Com. Ex. 2	Com. Ex. 3
Uniformity	0.8	1	1.2	2.2	3.1	2.1
(U %)
Loss of short	Absence	Absence	Absence	Presence	Presence	—
fibers

As shown in Table 3 above, in the case of the long-short composite yarns manufactured according to Examples 1 to 3, it was confirmed that the uniformity was excellent and there was no loss of short fibers.

On the other hand, in the case of the long-short composite yarns manufactured in Comparative Examples 1 and 2, it was confirmed that the uniformity was poor, and it was also confirmed that short fibers were lost. It was analyzed because the short fibers having the long length were used.

In addition, it was analyzed that the spun yarn manufactured in Comparative Example 3 also had poor uniformity.

Experimental Example 3. Confirmation of Physical Properties of Long-Short Composite Yarns

The physical properties of the long-short composite yarns and the spun yarns manufactured in Examples and Comparative Examples were measured, and the results thereof were shown in Table 4 below.

	TABLE 4
	Ex. 1	Ex. 2	Ex. 3	Com. Ex. 1	Com. Ex. 2	Com. Ex. 3
Tensile strength (g/d)	2.5	2.4	2.4	1.9	1.2	1.2
Tensile elongation (%)	29	28	29	28	27	24

As shown in Table 4 above, it was confirmed that the long-short composite yarns manufactured according to Examples of the present disclosure had excellent tensile strength and tensile elongation, and it was confirmed that the long-short composite yarns and the spun yarn manufactured according to Comparative Examples had reduced tensile strength.

MODES

Hereinafter, the present disclosure will be described in more detail. However, the present disclosure may be embodied in various different forms, and the present disclosure is not limited by examples described herein, and the present disclosure will be only defined by claims to be described below.

Terms used in the present disclosure are used only to describe specific examples, and are not intended to limit the present disclosure. A singular expression includes a plural expression unless the context indicates otherwise. Throughout the present specification, unless explicitly described to the contrary, ‘comprising’ a certain component means further comprising another component other than excluding the other component.

In the present disclosure, a long-short composite yarn includes both long fibers having a long length and short fibers having a short length, which may be referred to as a long-short composite yarn. At this time, the short fibers may be short fibers having a short length of 150 mm or less (preferably 60 mm or less, more preferably 0.01 mm to 10 mm, and even more preferably 1 mm to 5 mm), and may include a plurality of short fibers. In addition, the long fibers may mean long fibers having a length of more than 150 mm, i.e., a length longer than the length of the short fibers.

The present disclosure provides

• • a long-short composite yarn including: a short-fiber portion consisting of a plurality of short fibers adjacent to each other; and a long-fiber portion consisting of a plurality of long fibers formed by twisting on an outer peripheral surface of the short-fiber portion.

Hereinafter, the long-short composite yarn according to the present disclosure will be described in detail with reference to FIG. 1.

In one embodiment of the present disclosure, the long-short composite yarn may include a short-fiber portion consisting of a plurality of short fibers adjacent to each other. That is, the plurality of short fibers are adjacent to each other to form a lumped shape, which may be collectively referred to as a short-fiber portion.

In one embodiment of the present disclosure, the short fibers may be manufactured using fibers or may be obtained from waste fibers. In addition, the short fibers may be staple fibers, and preferably, the short fibers may include a plurality of the short fibers. At this time, the length of the fibers may be 150 mm or less, preferably 60 mm or less, more preferably 0.01 mm or more and less than 10 mm, and may be 1 mm to 5 mm according to one embodiment of the present disclosure. When the length of the short fibers is more than 5 mm, there may be problems that the uniformity of the manufactured long-short composite yarn is reduced, and the short fibers are lost.

In one embodiment of the present disclosure, the short fibers may be selected from the group consisting of vegetable fibers, animal fibers, mineral fibers, and combinations thereof.

In one embodiment of the present disclosure, the vegetable fibers may be fibers extracted or produced from the leaves, stems, barks or seeds of plants, and may be selected from the group consisting of cotton fiber, cellulose fiber, hemp fiber, pineapple fiber, coffee bean fiber, banana fiber, ramie fiber, corn silk fiber, bamboo fiber and combinations thereof. Meanwhile, when the vegetable fibers are included as the short fibers, the long-short composite yarn may increase naturalness and absorbency, and may have an eco-friendly effect.

In addition, the vegetable fibers may be short fibers that are difficult to be applied to ring spinning due to the short length, and for example, may be fibers made by drying and preservative-treating wood powder made from ground waste wood, coffee grounds, tea grounds, etc.

In one embodiment of the present disclosure, the animal fibers may be fibers obtained or produced from the wool of animals, and may be selected from the group consisting of, for example, leather fiber, wool fiber, cashmere, camel hair fiber, mohair fiber, alpaca fiber, silk fiber, and combinations thereof. Meanwhile, when the short fibers include the animal fibers, the short fibers may have the effects of soft feel, natural aesthetics, and warmth. In addition, the leather fiber may mean cowhide fiber.

In one embodiment of the present disclosure, the mineral fibers may be fibers extracted from natural mineral or mineral, and may be selected from, for example, mica fiber or glass fiber. Meanwhile, when the short fibers include the mineral fibers, the short fibers may have the effects of fire resistance, corrosion resistance, heat and noise insulation.

In addition, the short fibers may be regenerated fibers, and specifically, may be fibers obtained by regenerating short fibers selected from the group consisting of the vegetable fibers, animal fibers, mineral fibers, and combinations thereof. That is, the short fibers may be fibers regenerated from discarded fabrics or clothing, and for example, when cotton short fibers collected by re-carding underwear are used, the short fibers may have effects of soft feel, absorbency, and breathability of the cotton.

In one embodiment of the present disclosure, the long-short composite yarn may include a long-fiber portion consisting of a plurality of long fibers formed by twisting on the outer peripheral surface of the short-fiber portion. That is, the plurality of long fibers is twisted to have a predetermined directionality and formed along the outer peripheral surface of the short-fiber portion, which may be collectively referred to as the long-fiber portion. Accordingly, since the short-fiber portion exists in a form inserted into the long-fiber portion, the loss of the short fibers may be completely prevented. Meanwhile, since the short fibers use fibers having a short length, twisting may not occur even if the twisting is performed during the manufacturing process.

In one embodiment of the present disclosure, the long fibers may be polymer fibers, and long fibers having a long length may be used.

In one embodiment of the present disclosure, the long fibers may be in the form of a filament yarn, a spun yarn, a draw textured yarn (D.T.Y), or an air textured yarn (A.T.Y).

In one embodiment of the present disclosure, the long fibers may include fibers selected from the group consisting of polyester-based fibers, polyamide-based fibers, polyurethane-based fibers, polyurea-based fibers, polyacrylic-based fibers, polyvinyl alcohol-based fibers, polyvinyl chloride-based fibers, polyvinylidene chloride-based fibers, polypropylene-based fibers, polyethylene-based fibers, polystyrene-based fibers, polyfluoroethylene-based fibers, biodegradable fibers, and combinations thereof. Preferably, the long fibers may include fibers selected from the group consisting of nylon, vinylon, acrylic, polyvinyl alcohol (PVA), polyethylene (PE), and polypropylene (PP), polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), recycled polyethylene terephthalate (PET), polylactic acid (PLA), Tencel, chitosan, spider silk fibers, and combinations thereof. Meanwhile, preferably, the long fibers may include recycled polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT) or polylactic acid (PLA).

In one embodiment of the present disclosure, in the long-short composite yarn, the thickness of the long fibers may be 60 denier (D) or more, preferably 100 denier (D) to 2,000 denier (D), more preferably 100 denier (D) to 1,000 denier (D), and even more preferably 300 denier (D) to 1,000 denier (D). When the thickness of the long fiber is less than 100 denier (D), the thickness as a reference fiber may be too thin, so that the composite yarn containing the long fibers may not have sufficient physical properties, thereby making it difficult to be applied as a fabric. When the thickness thereof exceeds 2,000 denier (D), the thickness as the reference fiber may be too thick, so that there may be a problem that a unique texture expressed by including the short fibers is not well expressed.

In one embodiment of the present disclosure, in the long-short composite yarn, the content of the short fibers may be 10 parts by weight to 80 parts by weight based on 100 parts by weight of the composite yarn, preferably 20 parts by weight or more to less than 70 parts by weight, and may be about 30 parts by weight according to one embodiment of the present disclosure. When the content of the short fibers is less than 10 parts by weight based on 100 parts by weight of the composite yarn, the content of short fibers is too small, so that various feelings and effects may not be exhibited well by including various types of short fibers. When the content of the short fibers exceeds 80 parts by weight, the content of long fibers is relatively too small, so that there may be problems that the physical properties of the composite yarn deteriorate, and the short fibers may be lost.

In one embodiment of the present disclosure, the long-short composite yarn may completely prevent the loss of the short fibers because the long fibers are formed to wrap around the outside of the short fibers. In addition, in the long-short composite yarn, it is possible to collect the short fibers through a re-separation process after use.

In one embodiment of the present disclosure, the long-short composite yarn may have uniformity U % of less than 2, and preferably 1.2 or less. In addition, the tensile strength may be 2.0 g/D to 3.0 g/D, and the elongation may be 25% to 50%.

Hereinafter, a manufacturing method of a long-short composite yarn according to the present disclosure will be described in detail.

First, in one embodiment of the present disclosure, the manufacturing method of the long-short composite yarn may include injecting short fibers onto long fibers.

In one embodiment of the present disclosure, the injecting of the short fibers may be performed through a short fiber injection device, and the short fiber injection device may continuously include a gear pump for quantitatively supplying short fibers and a cylinder for uniformly dispersing and injecting the short fibers onto the surface of the long fibers. At this time, the amount of short fiber supplied through the gear pump may be 0.1 g/min/weight to 200 g/min/weight, and may be about 0.1 g/min/weight to 1.0 g/min/weight according to one example of the present disclosure. When the supply amount of the short fibers is less than 0.1 g/min/weight, the short fiber content is too low, so that the formability of the composite yarn becomes poor, and when the supply amount of the short fibers exceeds 1.0 g/min, there may be a problem that the physical properties of the manufactured long-short composite yarn are deteriorated. In addition, the rotation rpm of the gear pump may be 300 rpm or less, and the rotation rpm of the cylinder may be 3,000 rpm or less.

In one embodiment of the present disclosure, the short fiber injection device may further include a first air knife for supplying air to the cylinder. That is, the air is supplied to the cylinder to remove clumped short fibers attached onto the cylinder wire and provide uniform dispersion of the short fibers in the long fibers. At this time, the angle of the first air knife may be adjustable as needed, and the injected air pressure may be 3.0 kgf/cm² or less.

Next, in one embodiment of the present disclosure, the manufacturing method of the long-short composite yarn may include injecting air onto the long fibers into which the short fibers have been injected.

In one embodiment of the present disclosure, the injecting of the air may be performed through a second air knife, and the air may be injected at positions above and below the long fibers into which the short fibers have been injected. At this time, the angle of the second air knife may be adjustable as needed, and the injected air pressure may be 3.0 kgf/cm² or less.

In one embodiment of the present disclosure, the air is injected onto the long fibers into which the short fibers have been injected to remove clumped short fibers from the short fibers attached onto the surface of the long fibers and may be more uniformly bonded with the short fibers.

Next, in one embodiment of the present disclosure, the manufacturing method of the long-short composite yarn may include twisting the long fibers into which the short fibers have been injected.

In one embodiment of the present disclosure, the short fibers may be inserted into the long fibers by twisting the long fibers into which the short fibers have been injected. Therefore, as shown in FIG. 1, the short fibers are not lost, but may be firmly bonded into the long fibers. More specifically, the twisting may be performed through a winder, and the twisting may be performed through twisting and winding. That is, the short fibers may be more firmly bonded into the long fibers. Meanwhile, the twisting and winding speed may be 60 m/min or less, preferably 10 m/min to 60 m/min, and more preferably 15 m/min to 50 m/min. When the speed is less than 10 m/min, economic efficiency may be reduced, and when the speed exceeds 60 m/min, the twist per meter (TPM) of composite yarn formation may be low, resulting in loss of short fibers. In addition, the TPM level may be 800 or less, preferably 100 to 800, and more preferably more than 300 to 800 or less. When the TPM level is 300 or less, the short fibers may be lost from the formed composite yarn, and when the TPM level exceeds 800, excessive production speed reduction and excessive twisting may occur. Meanwhile, when the twisting is performed, the short fibers may not be twisted due to the short length, and only the long fibers may be twisted to have predetermined directionality.

In one embodiment of the present disclosure, the long-short composite yarn may be manufactured preferably under constant temperature and humidity conditions, and more specifically under room temperature and humidity conditions. That is, the long-short composite yarn may be manufactured at a constant temperature of about 20° C. to 30° C. and a constant relative humidity of 50% to 60%. At this time, when the long-short composite yarn is manufactured out of the temperature and humidity ranges, there may be a problem that static electricity is generated when supplying short fibers.

Hereinabove, the present disclosure has been described in detail along with preferred examples with reference to the drawings, but the scope of the technical spirit of the present disclosure is not limited to these drawings and examples. Accordingly, various modifications or equivalent ranges of examples may exist within the scope of the technical spirit of the present disclosure. Therefore, the scope of the technical idea according to the present disclosure should be interpreted by the appended claims, and the technical idea within the same or equivalent scope should be interpreted as belonging to the scope of the present disclosure.

INDUSTRIAL APPLICABILITY

As described above, according to the present disclosure, the long-short composite yarn includes short fibers, but can be used as a composite yarn because the short fibers are firmly bonded into the long fibers.

In addition, since the short fibers are inserted into the long fibers, the composite yarn can prevent the loss of the short fibers, and have excellent uniformity.

In addition, the composite yarn can be manufactured as composite yarns with various feels and effects by using various types of short fibers.

Finally, the composite yarn may have excellent tensile strength and elongation even by including short fibers, and thus can be widely used as a raw material for automobile interior materials, shoes components, or laminated and processed fabrics, such as rear surfaces of coated fabrics and non-woven intermediates.

Claims

1. A long-short composite yarn comprising:

a short-fiber portion consisting of a plurality of short fibers adjacent to each other; and

a long fiber portion consisting of a plurality of long fibers formed by twisting on an outer peripheral surface of the short-fiber portion.

2. The long-short composite yarn of claim 1, wherein the short fibers include a material selected from the group consisting of vegetable fibers, animal fibers, mineral fibers, regenerated fibers thereof, and combinations thereof.

3. The long-short composite yarn of claim 2, wherein the vegetable fibers include a material selected from the group consisting of cotton fiber, cellulose fiber, hemp fiber, pineapple fiber, coffee bean fiber, banana fiber, ramie fiber, corn silk fiber, bamboo fiber, and combinations thereof, the animal fibers include a material selected from the group consisting of leather fiber, wool fiber, cashmere, camel hair fiber, mohair fiber, alpaca fiber, silk fiber, and combinations thereof, and the mineral fibers are mica fibers or glass fibers.

4. The long-short composite yarn of claim 1, wherein the long fibers include a material selected from the group consisting of polyester-based fibers, polyamide-based fibers, polyurethane-based fibers, polyurea-based fibers, polyacrylic-based fibers, polyvinyl alcohol-based fibers, polyvinyl chloride-based fibers, polyvinylidene chloride-based fibers, polypropylene-based fibers, polyethylene-based fibers, polystyrene-based fibers, polyfluoroethylene-based fibers, biodegradable fibers, and combinations thereof.

5. The long-short composite yarn of claim 1, wherein the length of the short fiber is 5 mm or less.

6. The long-short composite yarn of claim 1, wherein the long-short composite yarn has uniformity U % of less than 2.