JP2010275668A - Combined polyester yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyester multifilament-combined yarn of high hollow rate, high bulkiness, high lightweightness, soft in terms of touch feeling. <P>SOLUTION: The combined yarn comprising polyester fibers with at least 90 moL% or more of the constituent polymer component being ethylene terephthalate units; wherein each of the multifilament yarns meets the following requirements: (a) the sectional shape rectangular to the fiber axis of the constituent monofilament has a square hollow core; (b) there are 8 fin parts A projecting from the surface of the core radially relative to the core center point and extended longitudinally the length of the core; and (c) 20 or more of the single filaments are included. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a polyester multifilament mixed yarn that is soft in texture and excellent in lightness and a fabric including the same.

  Polyester fibers have various excellent properties including mechanical properties and are used in various applications and fields including clothing. However, it has been said that it is harder in texture than natural fibers, does not absorb water, and is not preferable in terms of touch. Therefore, recently, in order to improve the functionality of the polyester fiber, the cross-sectional shape of the polyester fiber is changed, the water absorption is improved, or the polymer is modified to increase the lightness or improve the fibrillation property. Or have improved deep color.

  In particular, various techniques have been disclosed for reducing the weight of fibers. For example, the spinneret is made into a hollow shape to make a high hollow fiber, or a polyvinyl alcohol resin is added to the center using a composite fiber (usually called conjugate spinning) device, and the spinneret is taken up. Later, various methods have been proposed in which the resin is eluted, the hollow ratio of the substantial polyester fiber is increased, and lightness is exhibited (for example, see Patent Document 1).

  However, as a spinning method for hollow fibers, a spinning method that achieves a high hollow ratio with only the die shape requires a technique for bonding the polymer that is melted and discharged from the die discharge hole (the die design itself), and the bonding is stable. Therefore, when it is intended to achieve a high hollow ratio, it is difficult to stably perform production while suppressing the occurrence of spun yarn. Moreover, although the method of eluting the agent which forms a hollow as a composite fiber has a high hollow formation rate, the cost becomes remarkably high. In addition, it is difficult to completely dissolve the long fibers.

  Furthermore, in recent years, it aimed at lightness composed of a core part having a hollow cross section perpendicular to the fiber axis and a fin part protruding from the outer surface of the core part and extending along the length direction of the core part. Although a cross section has been proposed, the hollowness and the porosity in the multifilament state are low, and as a result, the lightness is not satisfactory. (For example, see Patent Documents 2 and 3)

  Further, it aims at lightness comprising a core part having a circular hollow section perpendicular to the fiber axis and a fin part protruding from the outer surface of the core part and extending along the length direction of the core part. However, since the cross section is a highly atypical cross section with few fins, the silk factor (strength x √ elongation) of the fiber is low, and fluff is generated in the spinning and drawing process. And the subject that the fall of the hollow ratio and porosity by deformation | transformation of a cross section was large occurred. (For example, see Patent Document 4)

Although these disclosed techniques can achieve a certain weight reduction of the fabric, there are limits to the softness and bulkiness.
Therefore, especially for sports apparel, fabrics having softness, lightness and bulkiness as well as strength are required, and mixed yarns are preferably studied as meeting the needs. (For example, Patent Documents 5 and 6)
However, to date, no blended yarn has been obtained that can be made into a soft, light and bulky fabric.

JP 2002-173824 A JP-A-9-241941 JP 2001-115334 A JP 2008-57060 A JP 2008-115497 A JP 2008-231599 A

  The object of the present invention is to solve the above-mentioned problems and to provide a hollow modified polyester partially oriented multifilament mixed yarn having a high porosity, soft in texture and having high light weight.

The inventors of the present invention have been obtained as a result of earnest studies to achieve the above-described object,
According to the present invention,
A polyester blended yarn comprising a polyester multifilament yarn satisfying the following requirements, which is a blended yarn comprising a polyester fiber in which at least 90 mol% of the polymer component constituting the fiber is composed of ethylene terephthalate units,
a) The cross-sectional shape orthogonal to the fiber axis of the constituent single yarn has a square hollow core portion.
b) It has eight fin portions projecting radially from the outer surface of the core portion with respect to the center point of the core portion and extending along the length direction of the core portion.
c) The single yarn is composed of 20 or more.
Is provided.

More preferably, in the cross section perpendicular to the fiber axis of the single yarn constituting the polyester multifilament, the hollow ratio shown by the following formula 1 is 30 to 60%, and the void forming ratio shown by the following formula 2 of the polyester multifilament yarn is 40%. -70% polyester blended yarn with a silk factor (strength x √ elongation) of 15 or more,
Hollow ratio (%) = (A / (B−A)) × 100 Formula 1
Void formation rate (%) = (NA / (C-NA)) × 100 (2)
A: Cross-sectional area B perpendicular to the single yarn fiber axis of the polyester multifilament constituting the present invention; Single-fiber cross-sectional outermost peripheral area C of the polyester multifilament constituting the present invention; Cross-sectional outermost peripheral area N; the number of single yarns included in the polyester multifilament constituting the present invention is provided.

  According to the present invention, not only the hollow ratio but also a large number of voids can be formed in the entire cross section of the polyester multifilament yarn, resulting in a decrease in the apparent specific gravity of the fiber yarn, and a very lightweight yet soft texture as a fiber / fabric. A certain fiber can be provided. By making it square hollow, generation | occurrence | production of the fluff at the time of a thread cut and extending | stretching is suppressed, and a hollow fiber can be manufactured with sufficient productivity.

The schematic diagram of the cross section orthogonal to the fiber axis of the single yarn of the atypical hollow polyester multifilament which comprises this invention. The schematic diagram of the cross section orthogonal to the fiber axis of atypical hollow polyester multifilament yarn. The schematic diagram of the discharge hole in the spinneret which manufactures the square hollow polyester multifilament yarn which has eight fin parts which comprise this invention. The blended fiber manufacturing apparatus of the Example of this invention. The schematic diagram of the cross section orthogonal to the fiber axis of the polyester fiber in the comparative example 2. FIG. The schematic diagram of the cross section orthogonal to the fiber axis of the polyester fiber in the comparative example 3. FIG.

The mixed yarn of the present invention includes a square hollow polyester multifilament having eight fin portions, and is entangled and mixed with other fibers by an air entanglement nozzle.
A square hollow polyester filament (which may be simply referred to as a polyester multifilament) having eight fin portions constituting the mixed fiber of the present invention will be described.

  The polyester used in the present invention comprises terephthalic acid as the main dicarboxylic acid component, and alkylene glycol such as ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, etc. Is a polyester containing 80% by weight or more, preferably 90% by weight or more of a polyester having diol as a main diol component, and the polyester includes, for example, isophthalic acid, naphthalenedicarboxylic acid, diphenyl, and the like within a range not impairing the object of the present invention. An aromatic dicarboxylic acid component such as dicarboxylic acid or another glycol component different from the above may be copolymerized.

  The intrinsic viscosity of the polyester (measured at 35 ° C. using orthochlorophenol as a solvent) is preferably in the range of 0.55 to 0.80, which is the same category as the polyester used as a fabric material for clothing. Further, if necessary, an additive such as a matting agent, an antistatic agent and a stabilizer, or an additive capable of forming micropores and fibrils on the fiber surface by alkali weight reduction may be included.

  As shown in FIG. 1 as a single yarn cross-sectional shape of a polyester multifilament, a core portion having a square hollow cross section perpendicular to the fiber axis, and a radial shape from the outer surface of the core portion to the core center point It is necessary to have a shape consisting of eight fin portions protruding in the length direction and extending along the length direction of the core portion. First, the shape of the hollow part of the core part can be made square by using the spinneret discharge slits as shown in FIG. The desired single yarn cross-sectional shape can be obtained.

  When the shape of the hollow part of the core part is round and hollow, the single yarn cross-sectional deformation frequently occurs due to poor bonding during spinning (because it is necessary to increase the number of bonded parts), and the process passability due to broken yarn is significantly reduced. .

As for the fin portion, a multifilament is formed by forming the fin portion into eight fin portions that project radially from the outer surface of the core portion with respect to the center point of the core portion and extend along the length direction of the core portion. A high volume exclusion effect due to interference between single yarns in a state can be obtained, and a desired void formation rate can be obtained.
Moreover, since the inter-fiber friction coefficient is reduced by setting the number of fins to eight, there is an effect that generation of fuzz and yarn breakage during stretching is small.

  The fineness of the polyester multifilament is preferably 30 to 400 dtex. If it is less than 30 dtex, the bulkiness is insufficient, and if it exceeds 400 dtex, the texture becomes hard. Preferably it is 30-200 dtex.

In addition, the number of single yarns of the polyester multifilament needs to be 20 or more, and if the number of single yarns is less than 20, the volume exclusion effect due to the attachment of the fins is not sufficient, and the desired bulkiness and lightness are achieved. I can't get it. On the other hand, when the number of single yarns is increased (when the fineness as a multifilament is increased), the bending rigidity of the fibers is increased, and the soft feeling in the fabric is lowered, which is not preferable. Preferably it is 25-50.
The polyester multifilament can be produced by a known melt spinning and stretching method using a die having a discharge shape schematically shown in FIG.

Next, the mixed yarn will be described.
Although not limited as a partner to be mixed with the above-mentioned polyester multifilament, it is preferably a hollow polyester fiber, for example, a fiber mixed with a hollow round cross-section, a hollow triangular hollow cross-section, a hollow square cross-section, etc. from the viewpoint of light weight. I can give you. As the blend ratio, for example, when the square hollow polyester multifilament having the eight fin portions is the yarn (1) and the partner polyester multifilament to be combined with this is the yarn (2), the blend ratio is each The total fineness ratio of the yarn is preferably in the range of (2) / (1) = 1.0 to 2.0.

  Although the manufacturing method of the mixed fiber of this invention is not specifically limited, For example, it can manufacture with an apparatus like FIG. That is, in FIG. 4, the square hollow polyester multifilament D having eight fin portions and the polyester multifilament E as a blended fiber constituting the present invention are supplied from the raw yarn supply roller 1 via the preheating roller 2, After being interlaced between fibers by a compressed air entanglement device (interless nozzle) 3, it is taken up by a take-up roller 4, heat-set by a set heater 5, and then wound as a polyester mixed yarn 6 of a product. At this time, it is preferable to adjust the peripheral speed ratio between the raw yarn supply roller and the take-up roller to give a slight relaxation.

There are no particular limitations on the method of weaving the polyester blended yarn and the weaving structure, but it is preferable to select a weaving method and structure that take advantage of the appearance characteristics and the swelling and texture of the blended fiber.
In order to effectively express the advantages of the blended yarn of the present invention, it is preferable to boil off, pre-set, dye, and final-set in accordance with conventional methods after the yarn is made into a fabric.

  Hereinafter, an example is given and the composition and effect of the present invention are explained in detail. In addition, the physical property in an Example is measured with the following method.

(1) Hollow ratio (%)
The hollow ratio is measured by cutting a section of polyester multifilament obtained by spinning and taking a cross-sectional photograph (from 560 times to 35,000 times) perpendicular to the fiber axis of a single yarn by SEM (scanning electron micrograph). The outer peripheral portion of the cross section perpendicular to the fiber axis of each single yarn in the image is connected by a line (the broken line portion in FIG. 1), and the inner area is defined as area A. Moreover, the cross-sectional area orthogonal to the fiber axis of the polyester filament yarn was calculated from the fineness and density and was defined as area B, and the hollow ratio was determined by the following equation. Here, the density was determined according to the density gradient tube method described in JIS L1013.
Hollow ratio (%) = A / (A−B) × 100
A: Cross-sectional polymer part area orthogonal to single yarn fiber axis B: Single yarn fiber cross-sectional outermost peripheral area Measurement was carried out from five fiber cross sections, and the average value was defined as the hollow ratio (%).

(2) Void formation rate (%)
The void formation rate was determined as follows. Cut the section of the polyester multifilament that has been spun and cut, take a cross-sectional photograph of the fiber (560 to 35000 times) with SEM, and draw the outer periphery of the polyester multifilament yarn in the photographic image with a line (dashed line in Fig. 2). The area of the knot was defined as area C.
Further, the cross-sectional area of the polyester multifilament yarn was calculated from the fineness and density to be area A, and the void formation rate was determined by the following formula. Here, the density was determined according to the density gradient tube method described in JIS L1013.
Void formation rate (%) = NA / (C-NA) × 100
A: Cross-sectional polymer part area C perpendicular to the single fiber axis C: Polyester multifilament yarn cross-sectional outermost peripheral area N: Number of single yarns contained in the polyester multifilament yarn The void formation rate (%).

(3) Weight reduction rate (%)
Measure the fabric weight (g / m ² ) and fabric thickness (mm) of a 24 gauge circular knitted fabric using 24 filaments and 167 dtex 48 filaments of polyester fiber 84 dtex, which is composed of a normal solid section, and measure the fabric weight with respect to the fabric thickness. Create a reference curve. The reduction rate of the basis weight at the same thickness value of the reference curve when the same 24 gauge circular knitted fabric was produced was defined as the weight reduction rate (%).

(4) Knitted texture (soft feeling)
The texture of a 24-gauge circular knitted fabric was evaluated in the following three stages in comparison with a 24-filament circular knitted fabric of 84 dtex of polyester fiber having a normal solid cross section.
Level 1: Soft and supple feel Level 2: Slightly soft feeling but repellent feel Level 3: Rough feel or hard feel

[Example 1]
Polyethylene terephthalate having an intrinsic viscosity of 0.64 was melted at 285 ° C. and discharged from a spinneret having 36 discharge holes shown in FIG. The discharged yarn was cooled and oiled with an oiling nozzle and wound up at a speed of 3000 m / min. The obtained partially undrawn yarn was drawn 1.5 times at a temperature of 80 ° C. and then heat-set at a temperature of 200 ° C. to obtain an 84 dtex polyester fiber. Polyethylene terephthalate filament yarn (E) having a hollow round cross section is mixed with the obtained square hollow polyester multifilament (D) having 8 fin portions by the apparatus shown in FIG. A polyester blended yarn was obtained. The obtained circular knitted fabric had a high weight reduction rate of 50% or more, and a soft feeling could be confirmed.

[Example 2]
A polyester mixed yarn having a fineness ratio shown in Table 1 was obtained in the same manner as in Example 1 except that the yarn was discharged from a spinneret having 24 discharge holes shown in FIG. In the obtained circular knitted fabric, the soft feeling was slightly inferior to that of Example 1, but a high weight reduction rate of 50% or more was confirmed.

[Comparative Example 1]
A polyester mixed yarn was obtained in the same manner as in Example 1 except that the yarn was discharged from a spinneret having 12 discharge holes shown in FIG. Although the obtained circular knitted fabric has a high weight reduction rate of 50% or more, it has a hard and crisp feel, and it has been difficult to develop for use in clothing.

[Comparative Example 2]
A polyester mixed yarn was obtained in the same manner as in Example 1 except that the core portion was round and hollow and the number of fins was 4 and was discharged from a spinneret having 36 discharge holes having the cross-sectional shape shown in FIG. The silk factor is low, the processability due to yarn breakage and fluff in the spinning process is reduced, and the obtained circular knitted fabric has a high weight reduction rate of 50% or more, but it is a hard and crisp feel and is used in clothing applications. Deployment was difficult.

[Comparative Example 3]
The polyester mixture was discharged in the same manner as in Example 1 except that the core portion was square hollow and the direction of the fins was non-radial with respect to the center point of the core portion and was discharged from a spinneret having 36 discharge holes having the sectional shape shown in FIG. A yarn was obtained. The weight reduction rate of the obtained circular knitted fabric was 50% or less, and a large weight reduction rate could not be confirmed.

  The polyester blended yarn of the present invention has many voids formed in the cross section of the fiber, and as a result, the apparent specific gravity of the fiber is lowered, and a very light and yet soft textured fiber / fabric is provided. Can do. Furthermore, alkali weight reduction processing can be implemented like a solid fiber. Therefore, woven and knitted fabrics with a wide variety can be created using this mixed yarn. Useful for sports clothing.

A: Multifilament single yarn fiber cross-sectional polymer part area constituting the blended yarn of the present invention B: Multifilament single filament fiber cross-sectional outermost peripheral area constituting the blended yarn of the present invention C: Blend of the present invention Cross-sectional outermost peripheral area D of multifilament constituting the yarn D: Square hollow polyester multifilament yarn E having 8 fin portions E: Polyester multifilament yarn 1 of the mixed fiber partner 1: Raw yarn supply roller 2: Preheating roller 3: Compressed air entanglement device 4: take-up roller 5: set heater 6: mixed yarn of product

Claims (3)

A polyester mixed fiber comprising a polyester multifilament yarn satisfying the following requirements, wherein the mixed yarn is a polyester fiber in which at least 90 mol% of the polymer component constituting the fiber is composed of an ethylene terephthalate unit. yarn.
a) The cross-sectional shape orthogonal to the fiber axis of the constituent single yarn has a square hollow core portion.
b) It has eight fin portions projecting radially from the outer surface of the core portion with respect to the center point of the core portion and extending along the length direction of the core portion.
c) The single yarn is composed of 20 or more. In the cross section orthogonal to the fiber axis of the single yarn constituting the polyester multifilament yarn, the hollow ratio shown by the following formula 1 is 30 to 60%, the void formation rate shown by the following formula 2 is 40 to 70%, and the silk factor ( The polyester mixed yarn according to claim 1, wherein the strength × √elongation) is 15 or more.
Hollow ratio (%) = (A / (B−A)) × 100 Formula 1
Void formation rate (%) = (NA / (C-NA)) × 100 (2)
A: cross-sectional area B orthogonal to single yarn fiber axis; single yarn fiber cross section outermost peripheral area C; multifilament yarn cross section outermost peripheral area N; number of single yarns included in multifilament yarn   A fabric comprising the polyester blended yarn according to claim 1.

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