JPH08226034A - Core-sheath type conjugate spun yarn and its production - Google Patents

Abstract

PURPOSE: To provide a method for producing a raw material for clothes, excellent in strength characteristics, wound resistance, heat resistance, abrasion resistance and dyeing property and suitable for door sport, etc. CONSTITUTION: This core-sheath type conjugated spun yarn is composed of a core part comprising a short fiber bundle A and a sheath part comprising a short fiber bundle B and the short fiber bundle A comprises a blended fiber of a polyester short fiber with an aromatic polyamide short fiber, and the short fiber bundle B comprises a polyester short fiber. This method for producing a core-sheath type conjugated spun yarn is to feed the short fiber bundle A comprising the polyester short fiber and the aromatic polyamide short fiber and the short fiber bundle B comprising a polyester short fiber to a ring spinning frame having a front top roller 5 comprising a pair of taper roller 5 and a front bottom roller 6 so that an amount of the short fiber bundle A becomes lower than the feed out amount of the short fiber bundle B and wind the short fiber bundle B round the short fiber bundle A used as a core part and apply real twist to yarn.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core-sheath composite spun yarn and a method for producing the same. More specifically, it is a core-sheath type composite spun yarn composed of aromatic polyamide short fibers and polyester short fibers, and has excellent cut resistance, heat resistance, and abrasion resistance, and is used in fields of application requiring functionality such as outdoor sports. Regarding the material for clothing that can be provided.

[0002]

2. Description of the Related Art Conventionally, polyester fibers are excellent in mechanical properties, thermal stability, washability, dyeability, etc., and thus have been used in a very wide range of applications such as clothes, industrial materials and interiors.

On the other hand, in recent years, the number of people participating in outdoor sports such as snowboarding, fishing and mountain climbing has been remarkably increasing, and as a result, the materials for clothing have been required to have higher durability than before, and particularly, cut resistance. What improved functionality, such as heat resistance and abrasion resistance, is desired.

On the other hand, aromatic polyamide fibers having excellent heat resistance, high abrasion resistance and high yarn strength have been widely used. For example, 100% aromatic polyamide fibers are used.
The filament yarn and the spun yarn obtained by partially using the filament yarn and spun yarn are mixed and woven.
It has been proposed in Japanese Patent Laid-Open No. 900, Japanese Patent Laid-Open No. 292036, and the like. Although all of these have improved tear resistance and cut resistance, they have drawbacks of aromatic polyamide fibers such as frosting and poor dyeability due to fibrillation of the fibers.

As a solution to these drawbacks, JP-A-3-830 proposes a core-sheath type composite spun yarn in which aromatic polyamide fibers are arranged in the core and polyester fibers are arranged in the sheath.

However, since this method is a method for producing a spun yarn having a two-layer structure by a conventionally known blending method, aromatic polyamide fibers partially appear on the spun yarn surface, and aromatic polyamide fibers are present in the inner layer of the spun yarn. It was not possible to obtain a satisfactory core-sheath type composite spun yarn because the polyamide fiber could not be completely wrapped. Therefore, the drawbacks such as frosting and dyeability due to the aromatic polyamide fiber described above have not been solved. Even if two layers can be formed, the difference in the physical properties of the aromatic polyamide fiber of the inner layer and the polyester fiber of the outer layer is large, and the two layers of the spun yarn exhibit different behaviors due to the two layers. Tensile strength characteristics, fiber elongation is significantly different between aromatic polyamide fiber component and polyester fiber component,
The strength characteristics of only the low elongation aromatic polyamide fiber appear,
Polyester fibers have the drawback of not contributing to strength properties.

[0007]

SUMMARY OF THE INVENTION The present invention comprises an aromatic polyamide fiber and a polyester fiber capable of solving the above-mentioned drawbacks, and has strength properties, cut resistance,
It is an object of the present invention to provide a core-sheath composite spun yarn excellent in heat resistance, abrasion resistance and dyeability, and a method for producing the same.

[0008]

The core-sheath type composite spun yarn of the present invention which achieves the above object has the following constitution.

That is, a composite spun yarn in which the core portion is made up of short fiber bundles A and the sheath portion is made up of short fiber bundles B, and the short fiber bundles A are made by blending polyester short fibers and aromatic polyamide short fibers. The core-sheath type composite spun yarn is characterized in that the short fiber bundle B is a polyester short fiber.

The core-sheath composite spun yarn manufacturing method of the present invention has the following constitution.

That is, in a ring spinning machine having a front top roller and a front bottom roller composed of a pair of tapered rollers arranged so that the draft ratio gradually increases in the width direction of the fiber bundle, polyester short fibers and aromatic polyamide short fibers are used. Short fiber bundle A consisting of fibers
And a short fiber bundle B made of polyester short fibers is fed so that the short fiber bundle A is lower than the delivery amount of the short fiber bundle B, and the short fiber bundle A is used as a core portion to form the short fiber bundle B. A method for producing a core-sheath composite spun yarn, which comprises winding and winding a real twist.

The present invention will be described in detail below.

The core-sheath type composite spun yarn of the present invention substantially eliminates the portion where the aromatic polyamide fiber appears on the spun yarn surface,
By arranging it in the core (inner layer) of the spun yarn, thereby improving frosting and dyeability, and eliminating the individual behavior in the yarn of the fiber having a large difference in physical properties, which is a drawback of double-layering, polyester and It is a spun yarn that allows the polyamide fiber to fully exhibit its properties.

That is, the core-sheath type composite spun yarn of the present invention is
The short fiber group to be arranged in the core is not composed of a single aromatic polyamide fiber, but is composed of a mixture of polyester fiber and aromatic polyamide fiber. By using a blended yarn of polyester fiber and aromatic polyamide fiber for the core, the difference in characteristics between the two can be alleviated, and by further coating polyester fiber as the sheath on the aromatic polyamide It is a core-sheath type composite spun yarn in which fibers are almost completely wrapped.

The short fiber bundle A constituting the core portion of the core-sheath composite spun yarn of the present invention will be described in detail.

The short fiber bundle A constituting the core portion is a fiber bundle made of a mixed spinning of polyester short fibers and aromatic polyamide short fibers. The polyester as used herein is a melt-spinnable polyester polymer such as polyethylene terephthalate or polybutylene terephthalate, and these polymers may contain a third component such as isophthalic acid, polyethylene glycol or polytetramethylene glycol, if necessary. Several types and those copolymerized are also included. The cross-sectional shape, single fiber fineness, and yarn physical properties of the polyester fibers constituting the short fiber bundle A are not particularly limited, but the breaking elongation thereof is preferably 10 to 40%.

On the other hand, aromatic polyamide fibers generally have a tensile strength of 15 to 30 g / d, a breaking elongation of 2 to 5% and a thermal decomposition starting temperature of 500 ° C., and are stronger and more heat resistant than general synthetic fibers. Much more expensive. Specific examples thereof include poly (p-phenylene terephthalamide), poly (m-phenylene isophthalamide), and aromatic copolyamide. These aromatic polyamides are often used mainly in the field of industrial materials because of their excellent strength properties. In the garment field, it is not often used due to problems such as poor dyeability, which is a defect of aromatic polyamide fibers, and poor abrasion resistance due to frosting due to fibrillation.

In the present invention, such aromatic polyamide short fibers are mixed with polyester short fibers to be used as a core portion of a composite spun yarn, and a spun yarn utilizing the characteristics of the aromatic polyamide short fibers is used for clothing. It is applicable.

The fiber bundle composed of a mixture of polyester short fibers and aromatic polyamide short fibers, which constitutes the short fiber bundle A as the core, is a sliver or roving produced by an ordinary spinning method. Is not particularly limited.

In the core-sheath composite spun yarn of the present invention,
The proportion of aromatic polyamide short fibers in the spun yarn is preferably 10% by weight or more from the viewpoint of imparting functionality such as cut resistance, heat resistance and abrasion resistance, and frosting improves frosting. And from the viewpoint of improving the dyeability, it is preferably 40% by weight or less. In addition,
In order to achieve this composition ratio, the ratio of the aromatic polyamide short fibers in the short fiber bundle A forming the core is 15 to
It is preferably in the range of 85% by weight.

Next, the short fiber bundle B constituting the sheath portion of the core-sheath type composite spun yarn of the present invention will be described.

The short fiber bundle B constituting the sheath portion is a polyester fiber and may be the same as the polyester fiber constituting the short fiber bundle A, but the cross sectional shape and the single fiber fineness may be changed, and the polymer is polyethylene. Terephthalate,
It may be a polyester polymer obtained by copolymerizing one or several third components such as polybutylene terephthalate and, if necessary, isophthalic acid, polyethylene glycol, polytetramethylene glycol and the like. Also,
When imparting a different color effect, a cationic dyeable polyester can be preferably used.

Further, the cross-sectional shape and the single fiber fineness of the short fiber bundle A and the short fiber bundle B in the present invention are not particularly limited. The fiber length is also not particularly limited according to the spinning method, but from the viewpoint of improving the quality of the spun yarn, it is preferable that the short fiber bundle A and the short fiber bundle B have the same fiber length.

The twist number of the spun yarn of the present invention is not particularly limited, but the twist coefficient K is preferably in the range of 2.8 to 4.5. here,
The number of twists = twist coefficient K × (count) ^1/2 .

Next, the method for producing the core-sheath composite spun yarn of the present invention will be described.

The method for producing the core-sheath composite spun yarn of the present invention is as follows:
By a ring spinning machine having a front top roller and a front bottom roller consisting of a pair of taper rollers, a short fiber bundle B after the apron draft that has passed through the guide to the side with a high delivery amount of the front roller,
The short fiber bundle A after the apron draft, which has been passed to the side with the lower delivery amount, is simultaneously spun, and the short fiber bundle B is centered around the short fiber bundle A.
Is sequentially wound at the time of applying the actual twist, and the short fiber bundle A of the core portion is wrapped in a twisted shape to form a yarn.

FIG. 1 is a process schematic view showing an example of a method for producing a core-sheath type composite spun yarn of the present invention.

FIG. 1 shows an outline of drafting and twisting in a spinning machine. Short fiber bundles A and short fiber bundles B supplied to the fine spinning machine are respectively supplied to a back roller 3 and then passed through an apron draft 4. It is gripped by a pair of tapered front rollers. At this time, the short fiber bundle B is supplied to the side of the front roller having a high feed amount via the trumpet 1, and the short fiber bundle A is supplied to the side of the front roller having a low feed amount via the trumpet 2. The two components gripped by the front roller are combined, combined with a ring and a traveler to give a true twist, and wound into a yarn tube by a usual method.

It is preferable that the proportion of the aromatic polyamide short fibers in the spun yarn as a whole of the core-sheath type composite spun yarn is 10 to 40% by weight, from the viewpoint of uniformly coating the aromatic polyamide, and the core component. It is preferable to carry out spinning in such a manner that the ratio of the aromatic polyamide short fibers in the short fiber bundle A is within the range of 15 to 85% by weight.

The core-sheath of the present invention is prepared by appropriately selecting the thicknesses of the short fiber bundle A and the short fiber bundle B, and simultaneously spinning them with a ring spinning machine having a distance between the short fiber bundles of about 3 to 15 mm. A type composite spun yarn can be obtained. The degree of these intervals is to change the difference in the delivery amount of both components, that is, the winding state of the short fiber bundle B, and can be set by observing the overlapping state and the physical properties of the composite yarn.

FIG. 2 is a front view showing an example of a tapered bottom roller used in the method for producing a core-sheath type composite spun yarn of the present invention.

FIG. 3 is a front view showing an example of a tapered top roller used in the method for producing a core-sheath composite spun yarn of the present invention.

In the ring spinning machine used in the present invention, as shown in FIG. 2, the front bottom roller 6 has a tapered shape for each spindle corresponding to the spindle. Then, as shown in FIG. 3, a pair of top rollers whose surfaces are made of rubber cot in the same taper direction are attached to the penjoram arm in the same manner as the conventional top roller so as to correspond to these taper front bottom rollers 6, and a load is applied. To do so.

A rubber cot is attached to the surface of the top roller so that it is oriented in the same direction as the bottom roller taper portion. The taper angle is set to be substantially the same as the bottom taper angle, and the working width is set to be substantially the same as the bottom taper width, but it may be slightly smaller.

In the manufacturing method of the present invention, as described above, a bottom roller consisting of a pair of taper rollers,
Attach the top roller and grip the sliver and roving in the usual way. Therefore, the draft changes along the width direction of the fleece, and the short fiber bundle A gripped by the large diameter portion is sequentially wound around the short fiber bundle A gripped by the small diameter portion, and the core-sheath type having excellent covering properties is obtained. A composite spun yarn can be obtained.

The fleece of the rovings A and B can be controlled by a collector or the like.

As the fiber bundle composed of the polyester short fibers and the aromatic polyamide short fibers which compose the short fiber bundle A, sliver or roving produced by a usual spinning method and spun yarns can be used. It may be.

[0038]

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

The method of measuring the characteristic values and the like in the examples is as follows.

(1) Cutability (cutting resistance) Two sample sheets are held in the center of the frame body at intervals of about 3 mm, and the slit portion of the sample sheet is cut on two sides at an angle of 60 degrees. The vertical load was applied against the blade of a certain blade rope, and the maximum load at which the sample sheet was cut when the blade edge was pressed against the sample sheet at a speed of 500 mm / min to measure the cut load was evaluated.

(2) Abrasion Strength (Frosting) It was measured according to JIS L 1096 "General woven fabric test method".

(3) Anti-fusing property (heat-fusible property of tobacco) When the sample was brought into contact with the tip of a metal rod (diameter of about 0.6 cm) heated to 360 ° C. for 5 seconds, the degree of perforation was grade 5 ( The grade was judged in 5 grades from no hole) to 1st class (completely holed).

(4) L value The brightness L value was measured using an SM color computer (manufactured by Suga Test Instruments Co., Ltd.).

[Example 1, Comparative Examples 1-2] Fineness 1.5
d, 60% of polyester short fibers having a fiber length of 51 mm, and an aromatic polyamide (poly (p
-Phenylene terephthalamide)) Short fiber (Dupont
Toray-Kevlar "Kevlar" (trademark) 40% by weight raw cotton blended by a normal spinning method, thickness 0.3g
/ M of roving was prepared.

On the other hand, 100% polyester short fibers having a fineness of 1.5 d and a fiber length of 51 mm were made to have a thickness of 0.3 by the same spinning method.
Each g / m roving was prepared.

These two rovings were set on a 2-inch ring spinning machine having a pair of front taper rollers.

A roving obtained by mixing polyester fibers and aromatic polyamide fibers is fed through a trumpet from the back roller to the side where the front roller feed amount is low, and to the side where the front roller output amount is high 100% polyester short fibers. Threads were fed through the trumpet. The total spinning draft is 30.4 times, the core-sheath composite spun yarn count is 30S (cotton count), and the twist coefficient is K =
It was set to 4.0 (21.9 T / in). Fleece spacing of each roving is 5mm
After drafting and coalescing, it was wound up on a yarn tube by a usual method to obtain a core-sheath composite spun yarn of 20% aromatic polyamide fiber having a core-sheath ratio of 50/50.

For comparison, a polyester fiber and an aromatic polyamide fiber similar to those described above were made into 100% roving yarns having a thickness of 0.8 g / m and 0.2 g / m, respectively, and the same taper roller as above was used. With a spinning machine having a total draft of 50.7 times, a core-sheath composite spun yarn of 20% aromatic polyamide fiber having the same number and the same twist with aromatic polyamide fiber as an inner layer and polyester fiber as an outer layer was obtained. (Comparative example 1).

On the other hand, 80% of polyester fiber and 20% of aromatic polyamide fiber were mixed and spun into raw cotton to obtain 1.0 g / m 2.
Of the aromatic polyamide fiber is uniformly mixed in a single layer by a conventional spinning method (a count and a twist number are the same as those in Example 1). Obtained (Comparative Example 2).

Each of these various spun yarns obtained was made into a fabric with a weaving density of 96 × 70 yarns / in by using warp yarns and weft yarns, and then polyester fibers were dyed by a usual dyeing method (130 ° C. × 60 min), The appearance state of the aromatic polyamide fiber on the spun yarn surface (covering property of aramid fiber), tear strength, dyeability, cut resistance, abrasion resistance (abrasion strength), anti-fusion property and the like were evaluated.

The evaluation results are shown in Table 1.

[0052]

[Table 1] As shown in Table 1, the aromatic polyamide fiber 2 of Comparative Example 2
In the 0% raw cotton blended yarn, many polyamide fibers appeared on the surface of the spun yarn, and the dyeability and the color developability were poor. In addition, the core-sheath composite spun yarn of Comparative Example 1 in which the aromatic polyamide fiber is independently arranged in the inner layer and the polyester fiber is arranged in the outer layer, the appearance of the aromatic polyamide fiber on the spun yarn surface is higher than that of Comparative Example 2. Although improved, it was inferior to Example 1 of the present invention in tear strength, dyeability, cut resistance, abrasion resistance (abrasion strength), and fusion resistance.

[0053]

The core-sheath type composite spun yarn of the present invention has an aromatic polyamide fiber by arranging a fiber bundle composed of a blend of polyester fiber and aromatic polyamide fiber in the core part and polyester fiber in the sheath part. Is a core-sheath type composite spun yarn that is evenly coated, solves the drawbacks of aromatic polyamide fibers, and has excellent strength characteristics, cut resistance, heat resistance, abrasion resistance, and dyeability, such as outdoor sports. It is possible to obtain a material for clothing which can be provided in the application fields where the functionality of is required.

Further, according to the method for producing a core-sheath type composite spun yarn of the present invention, a 2-inch ring spinning machine having a pair of front taper rollers is used, and the polyester fiber and the aromatic polyamide fiber constituting the core portion are combined. Supplying a fiber bundle consisting of mixed spinning to the side with a low delivery amount of the front roller,
Aromatic polyamide fibers can be uniformly coated by supplying the polyester fibers that form the sheath to the side of the front roller having a high delivery amount, and the strength characteristics, cut resistance, heat resistance, wear resistance, and further A clothing material having excellent dyeability can be provided.

[Brief description of drawings]

FIG. 1 is a process schematic view showing an example of a method for producing a core-sheath composite spun yarn of the present invention.

FIG. 2 is a front view showing an example of a front bottom roller used in the core-sheath composite spun yarn manufacturing method of the present invention.

FIG. 3 is a front view showing an example of a front top roller used in the method for producing a core-sheath composite spun yarn of the present invention.

[Explanation of symbols]

A: A coarse yarn made of a blend of polyester short fibers and aromatic polyamide short fibers B: A coarse yarn made of polyester short fibers 1, 2: Trumpet 3: Back roller 4: Apron draft 5: Front top roller having a taper 6: Front bottom roller with taper 7: Core-sheath composite spun yarn

Claims (2)

[Claims] 1. A composite spun yarn having a core portion of a short fiber bundle A and a sheath portion of a short fiber bundle B, wherein the short fiber bundle A is made of a mixed spinning of polyester short fibers and aromatic polyamide short fibers, A core-sheath type composite spun yarn, wherein the short fiber bundle B is a polyester short fiber. 2. A ring spinning machine having a front top roller and a front bottom roller composed of a pair of taper rollers arranged so that the draft ratio is gradually increased in the width direction of the fiber bundle. A short fiber bundle A made of fibers and a short fiber bundle B made of polyester short fibers are fed so that the short fiber bundle A is lower than the delivery amount of the short fiber bundle B, and the short fiber bundle A is cored. A method for producing a core-sheath type composite spun yarn, wherein the short fiber bundle B is wound as a part and a real twist is imparted.