JP2002069707A - Underwear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide, at a low cost, an underwear suitable for wide-ranging applications for men as well as ladies, excellent in percentage elongation and elastic recovery of percentage elongation, and also having enough burst strength and drape. SOLUTION: This underwear is made of a knitted fabric where conjugate fiber filaments formed by conjugating different kinds of polyester polymers with each other along the fiber length direction in a side-by-side fashion, are contained at >=10 wt.% based on the whole constituent yarns and whose average percentage elongation in the longitudinal and horizontal directions and average elastic recovery of percentage are >=55% and >=60% respectively, and also the knitted fabric has a burst strength of >=0.25 Mpa and a bending resistance determined by the cantilever method of 5-30 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to underwear. More specifically, the present invention relates to underwear having excellent stretchability and recovery, mechanical strength, and softness.

[0002]

2. Description of the Related Art Underwear includes general women's underwear such as slips, camisole, petticoats, shorts, shirts, bodysuits, girdle, brassiere, and general men's underwear such as round neck shirts, U neck shirts, running shirts and briefs. There are many underwear.

[0003] These underwears are required to have an excellent stretchability and recoverability to follow the movement of the body, to fit the body moderately and not to hinder the movement of the body, to have a soft touch, and to have a mechanical strength to withstand repeated wearing. Is done.

[0004] Compared to woven fabrics, knitted fabrics tend to exhibit stretchability in terms of their fabric structure, and are easy to move with the movement of the body.
It is often used for underwear because of its softness.

[0005] However, in recent years, underwear that fits the body and is more mobile has been desired, and various technical improvements have been made to the fibers and fabrics used.

In particular, in order to obtain high stretchability and recoverability, underwear is often used by using a knitted fabric in which a polyurethane-based elastic fiber called spandex is combined with nylon fiber, polyester fiber, cotton yarn, or the like.

[0007] However, although polyurethane-based elastic fibers have high stretchability, when they are mixed, the texture becomes hard as an inherent property of polyurethane, and the texture and drape of the underwear due to the knitted fabric tend to decrease. In addition, when mixed with polyester fibers, it is difficult to dye into disperse dyes for polyester, causing problems of washing liquid contamination,
In addition, the problem of deterioration of the fastness to wet friction of underwear is common. This not only complicates the dyeing process such as enhanced reduction washing, but also makes it difficult to dye the desired color. Furthermore, since heat resistance is inferior, there is a problem that the surface of the knitted fabric is rough and, consequently, the underwear surface is rough. Further, the cost of the polyurethane-based elastic fiber is very high.

Further, for example, a method of giving a stretch property by subjecting a polyester fiber or a nylon fiber to false twisting and mixing a fiber having a torque generated by twisting / untwisting is used. However, it is within the range of conventional stretchability.

Further, for example, a method of mixing polybutylene terephthalate fibers has been adopted. However, even if these fibers are mixed, it is still not possible to obtain underwear having a stretch property that is sufficiently satisfactory.

[0010]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and provides mechanical strength, chemical resistance, and the like.
An object of the present invention is to provide an undergarment made of a knitted fabric having excellent stretchability and recoverability while maintaining dyeing workability, softness, swelling, and the like, and to provide such underwear efficiently at low cost. Things.

[0011]

In order to achieve the above object, the present invention employs the following constitution. That is, (1) an average elongation in the vertical and horizontal directions is 55% or more, including 10% by weight or more of the entire constituent yarns of a composite fiber filament in which different kinds of polyester polymers are bonded in a side-by-side type along the fiber length direction. An undergarment comprising a knitted fabric having an average elongation recovery rate of 60% or more, and having a burst strength of the knitted fabric of 0.25 MPa or more and a softness by a cantilever method of 5 to 30 mm.

(2) A composite fiber filament in which different kinds of polyester polymers are bonded in a side-by-side manner along a fiber length direction, wherein at least one of the different kinds of polyester polymers is mainly composed of polytrimethylene terephthalate. An undergarment comprising a knitted fabric containing 10% by weight or more of the composite fiber filaments described above, and having a bursting strength of 0.25 MPa or more and a bending resistance of 5 to 30 mm by a cantilever method.

(3) The underwear according to (1) or (2), wherein the single fiber fineness of the composite fiber filament bonded in a side-by-side type is 0.1 to 11 dtex, and the total fineness is 22 to 193 dtex.

(4) The knitted fabric according to any one of (1) to (3), wherein the knitted fabric has a density of 22 to 85 wells / inch and 28 to 138 courses / inch and a basis weight of 60 to 280 g / m ² . underwear.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The knitted fabric for underwear according to the present invention comprises, as constituent yarns, a composite fiber filament in which different kinds of polyester polymers are bonded in a side-by-side type along the fiber length direction.

The side-by-side type conjugate fiber is formed by laminating polymers having different kinds, intrinsic viscosities, copolymerization components, copolymerization ratios, etc. of the polymer, and develops a crimp due to a difference in their elastic recovery rates and shrinkage characteristics. Things. In the case of a combination of polymers having different viscoelasticities, stress is concentrated on the high viscosity side during spinning and drawing, so that the internal strain differs between the two components. Therefore, the high-viscosity side shrinks due to the difference in elastic recovery rate after stretching and the difference in heat shrinkage rate in the heat treatment step of the knitted fabric, causing distortion within the single fiber to take a form of three-dimensional coil crimp. The diameter of the three-dimensional coil and the number of coils per unit fiber length are determined by the difference in shrinkage between the high shrinkage component and the low shrinkage component (including the difference in elastic recovery rate).
The larger the difference in shrinkage, the smaller the coil diameter and the larger the number of coils per unit fiber length.

The coil crimp required as a stretch material for underwear has a small coil diameter, a large number of coils per unit fiber length (excellent elongation characteristics, good appearance), and good coil set resistance. (The amount of settling of the coil in accordance with the recovery from elongation is small, and the stretch retention is excellent), and the hysteresis loss at the time of recovery from the elongation of the coil is small (excellent elasticity and good fit). The diameter of this coil is preferably 250 μm or less, and 200 μm or less.
m or less is more preferable.

The phase of the coil formed in the length direction of the filament yarn is such that, when the coil phases of all the single fibers constituting the yarn are aligned, one filament yarn is formed into one spring-like shape. It becomes a thread. The knitted fabric using this yarn has a soft feeling with cramps, and on the surface, underwear composed of a knitted fabric with a fine surface and a beautiful surface can be obtained. vice versa,
When the coil phases of all the single fibers constituting the yarn are different, one filament yarn becomes a false twisted / untwisted temporary twisted yarn having one swelling. The knitted fabric using this yarn has a soft feeling with swelling, and the underwear of the knitted fabric having a flat and beautiful surface can be obtained. When obtaining a stretch-knitted fabric for underwear, there is no particular limitation on which yarn to use, and it may be appropriately used depending on the kind of underwear, preference, and the like.

By satisfying these requirements and having the properties as polyester, for example, moderate tension, drape, and high color fastness, it is possible to prepare an undergarment made of a stretch material excellent in total balance. Here, in order to satisfy the above-mentioned coil characteristics, characteristics of a high shrinkage component (high viscosity component) are important. As for the expansion and contraction characteristics of the coil, since the expansion and contraction characteristics of the high contraction component with the low contraction component as the fulcrum are dominant, the polymer used for the high contraction component is required to have high extensibility and recovery characteristics.

The inventors of the present invention have conducted intensive studies to satisfy the above-mentioned properties without impairing the properties of the polyester. As a result, a polyester mainly composed of polytrimethylene terephthalate (hereinafter abbreviated as PTT) was used as a high shrinkage component. It has been found preferable to use them. PTT fiber is
It has excellent mechanical properties and chemical properties equivalent to typical polyester fibers such as polyethylene terephthalate (hereinafter abbreviated as PET) and polybutylene terephthalate (hereinafter abbreviated as PBT) fibers, and is extremely excellent in elongation recoverability. I have. This is because in the PTT crystal structure, the methylene chain of the alkylene glycol moiety has a Gauche-Gauche structure (the molecular chain is bent at 90 degrees), and furthermore, the constraint point density due to the interaction (stacking, parallel) between benzene rings. It is considered that the molecular chain is easily extended and recovered by the rotation of the methylene group because of low flexibility and high flexibility.

Here, PTT is a polyester obtained by using terephthalic acid as a main acid component and 1.3-propanediol as a main glycol component. However, it may contain a copolymer component capable of forming another ester bond at a ratio of 20 mol%, more preferably 10 mol% or less. As the copolymerizable compound, for example, isophthalic acid, succinic acid, cyclohexanedicarboxylic acid, adipic acid, dimeric acid, sebacic acid, dicarboxylic acids such as 5-sodium sulfoisophthalic acid, ethylene glycol, diethylene glycol, butanediol,
Examples thereof include diols such as neopentyl glycol, cyclohexanedimethanol, polyethylene glycol, and polypropylene glycol, but are not limited thereto. If necessary, titanium dioxide as a matting agent, silica or alumina fine particles as a lubricant, hindered phenol derivatives as antioxidants, coloring pigments and the like may be added.

The low shrinkage component includes a high shrinkage component P
The fiber-forming polyester is not particularly limited as long as it is a fiber-forming polyester having good interfacial adhesion with TT and stable spinning properties. However, considering the mechanical properties, chemical properties, and raw material prices, the fiber-forming ability is high. PTT, PET, and PBT are preferred.

The melt viscosity of the PTT at the spinning temperature is preferably 1.0 to 5.0 times the melt viscosity of the other low shrinkage component at the spinning temperature. By setting it to 1.0 times or more, preferably 1.1 times or more, the PTT receives a larger spinning stress at the time of spinning fiber formation, and a stronger crimp developing ability can be obtained. On the other hand, 5.0
When the ratio is not more than 2.0 times, preferably not more than 4.0 times, the control of the composite form becomes easy, and the bending of the discharged polymer under the die can be suppressed to a level that does not cause a problem in spinning.

The composite ratio of the two components is determined in terms of the spinning properties and the dimensional homogeneity of the coil in the fiber length direction.
Low shrinkage component = 75: 25 to 35:65 (% by weight) is preferable, and 65:35 to 45:55 is more preferable.

The fiber cross-sectional shape of the side-by-side type conjugate fiber is a round cross section, a triangular cross section, a multi-lobal cross section,
A flat cross section, a Dharma cross section, a C cross section, an M cross section, an H cross section, an X cross section, a W cross section, an I cross section, and a + cross section can be used. Is a semicircular side-by-side (a) having a round cross section as shown in FIG. 2, a hollow side-by-side (d) for underwear aiming for lightness and heat retention, and a triangular-section side-by-side (g) for underwear aiming for a dry texture. Is preferably used.

The side-by-side type composite fiber is preferably composed of a filament yarn having a single yarn fineness of 0.1 to 11 dtex and a total fineness of 22 to 193 dtex.

By setting the single yarn fineness to 11 dtex or less, the texture of the knitted fabric is soft and has an appropriate drape property, and can be preferably used as underwear. In addition, by making it 0.1 decitex or more, more preferably 1.1 decitex or more, the composite yarn production becomes good, the crimped structure is reflected, and good stretchability can be obtained. Further, yarns having different single yarn deniers, such as mixed yarns of different deniers, may be used. Such a mixed fineness yarn is preferred from the viewpoint of producing an undergarment made of a knitted fabric having a soft and moderate tension.

The mixing ratio of the side-by-side type composite fiber to the constituent yarns of the knitted fabric is 10% by weight or more,
It is preferably at least 20% by weight, more preferably at least 30% by weight. When the mixing ratio is less than 10% by weight, it is difficult to obtain good characteristics regarding the average elongation and the average elongation recovery of the knitted fabric for underwear described later in the vertical and horizontal directions. As a method of mixing the side-by-side type composite fiber into a knitted fabric, normal knitting, twisting, drawing, covering, blending with other materials can be adopted,
It may be properly used depending on the intended use of the underwear type, the knitted fabric forming method, the knitted structure, and the like.

Other materials include synthetic fibers such as polyester fibers, polyamide fibers, polyacrylonitrile fibers, polyvinyl alcohol fibers, polyvinyl chloride fibers, polypropylene fibers, polyurethane fibers, and semi-synthetic fibers. Fiber-based acetate fiber or regenerated fiber viscose rayon, cellulosic fiber including cupra, milk protein fiber, protein fiber including soy protein fiber, polylactic acid-based fiber, or use of these filament yarns and spinning There are yarn use, blended yarn use, or plant-based natural fibers including cotton and hemp, or animal-based natural fibers including wool, cashmere, and silk, or further use of these mixed yarns.

The knitted fabric for underwear according to the present invention is characterized in that an excellent elongation rate and elongation recovery rate can be obtained without mixing polyurethane elastic fibers as in the prior art. In order to obtain the characteristics of the knitted fabric, polyurethane-based elastic fibers may be mixed within a range that does not impair the texture, the dyeing property, and the like.

The knitted fabric worn under the skin is a single circular knit or double circular knit which is a circular knit, a single tricot or double tricot knit which is a warp knit, a single raschel knit or a double raschel knit. It can be knitted by each dedicated knitting machine according to the target underwear type and the like. The knitting structure is used as an undergarment such as a half knitted fabric, a satin structure, a mesh structure, and a one-sided unevenness structure of a warp knitted fabric, such as a circular knitted fabric, a jersey structure, a fawn structure, an interlock structure, a mesh structure, and a one-sided unevenness changing structure. Of the knitting organization that is applicable.

The knitted fabric for skin of the present invention has a density of 22 to 85.
At wells / inch and 28-138 courses / inch,
Further, the basis weight is preferably from 60 to 280 g / m ² . By setting the density of the knitted fabric to 22 wells / inch or more and 28 courses / inch or more, the strength of the underwear is not reduced, and the occurrence of kinks is eliminated, and the knitting property is improved. And a density of less than 85 wells / inch;
By setting it to 8 courses / inch or less, the texture of the knitted fabric is not hardened, and the knitting property is further improved without impairing the lightweight feeling, which is preferable.

By setting the basis weight of the knitted fabric to 60 g / m ² or more, underwear having mechanical strength can be obtained, and 280 g / m ^2.
By setting it as follows, the texture of the underwear does not become hard, it feels heavy, the ease of movement is not hindered, and the wearability is good.

The knitting conditions in this knitting are preferably such that the loop length and the runner length are slightly longer than the knitting conditions for ordinary threading to reduce the knitting density. This allows
By passing the conjugate fiber bonded in the side-by-side type through the dyeing process, it is possible to obtain a knitted fabric having sufficient crimping property and excellent stretchability, softness, and swelling feeling.

The heat treatment, scouring, dyeing and the like of the knitted greige fabric may be performed in accordance with a normal knitted fabric processing method, but the latent crimp of the side-by-side type composite fiber is more effectively used as a spring structure. It is preferable that the temperature for the relaxation and scouring heat treatment be 80 ° C. or higher in order to achieve the optimum expression. In addition, as ancillary processing at the dyeing stage, antifouling processing, antibacterial processing, deodorizing processing, deodorant processing, sweat absorption processing, moisture absorption processing, ultraviolet absorption processing, weight reduction processing, etc. It is desirable to appropriately provide the desired underwear type, such as processing, raising processing, and opal processing, according to the required characteristics of the underwear type.

It is important that the knitted fabric for underwear of the present invention has an average elongation in the vertical and horizontal directions of 55% or more and an average elongation recovery in the vertical and horizontal directions of 60% or more.

The average elongation rate and the average elongation recovery rate can be measured by the methods described in the examples. The elongation rate indicates the degree of elongation of the knitted fabric. When worn, it is easy to follow the movement of the body,
Easy to move and less tired. In addition, the elongation recovery rate indicates the degree of recovery that the knitted fabric stretched by the movement of the body tends to return to the original state quickly. The larger the value, the better the fit when worn as underwear. Easy to move.

It is necessary to consider the elongation rate and the elongation recovery rate by averaging the numerical values of the knitted fabric in the warp direction and the weft direction.
This means that when actually wearing and moving underwear, the knitted fabric is stretched not only in one direction but in the vertical or horizontal direction, but the fabric is stretched three-dimensionally according to the roundness of the human body That's why. This three-dimensional elongation characteristic is an average elongation rate that is an average elongation rate in the vertical and horizontal directions of the knitted fabric,
It is correlated with the average elongation recovery rate and is in good agreement.

The average elongation in the warp and weft directions of the knitted fabric in the present invention is 55% or more, preferably 70% or more, more preferably 80% or more. If the average elongation is less than 55%, the underwear is worn as underwear, and if the user moves violently, the underwear does not easily follow the movement of the body, and it is not easy to be tired.

The average elongation recovery rate of the knitted fabric in the warp and weft directions in the present invention is preferably 60% or more.
0% or more is more preferable, and 80% or more is further preferable. If the average elongation recovery rate is less than 60%, the knitted fabric that has been stretched by the movement will be in a stretched state, and it will be difficult to follow the movement of the body due to poor fit to the body. In addition, the appearance as underwear is also inferior.

It is important that the underwear of the present invention has a softness by a cantilever method of 5 to 30 mm. The bending resistance according to the cantilever method serves as a standard for the softness of the knitted fabric, and can be measured by the method described in Examples.
If the bending resistance is less than 5 mm, the texture of the knitted fabric becomes too soft, and it becomes difficult to move with the body. Also, 30m
If it is larger than m, the texture of the knitted fabric becomes hard and becomes unsuitable as underwear.

The knitted fabric used for the undergarment of the present invention has a bursting strength of 0.25 MPa or more. If the rupture strength of the knitted fabric is less than 0.25 MPa, the knitted fabric breaks during wearing and cannot be used.

If only the above softness is used, it can be achieved to some extent by appropriately setting the fineness of the yarn used and the basis weight of the knitted fabric, but it is possible to obtain a desired softness while maintaining the burst strength. is important.

Also from this point, the PTT / PET conjugate fiber is suitable for the underwear knitted fabric of the present invention since it has good flexibility while maintaining the strength as a fiber.

The underwear of the present invention can be widely developed as follows by appropriately selecting it. For example, slips, camisoles, petticoats that are general women's underwear,
Shorts, underpants, shirts, bodysuits, girdle, brassiere, etc. It can be preferably used for round neck shirts, U neck shirts, running shirts, briefs, trunks, under pants and the like which are general men's underwear.

[0046]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. Each evaluation in the examples was performed as follows.

(1) Melt viscosity Melt viscosity was measured in a nitrogen atmosphere using a Capillograph 1B manufactured by Toyo Seiki Co., Ltd. The temperature shown in the examples (Example 1
Is 275 ° C.), and the strain rate is 608.
The measurement at ⁰ sec ^-1 was performed three times, and the average value was taken as the melt viscosity.

(2) Average Elongation Rate First, the elongation rate was tested according to the grab method of the constant speed elongation method of JIS L 1018 “Knitted fabric test method”. That is, a test piece of 10 cm × about 15 cm is vertical,
Three samples were taken in each of the horizontal directions. Using a constant-speed extension-type tensile tester with a self-recording device, the upper and lower grips are 2.54 cm x 2.54 cm on the front side and 2.54 cm x on the back side.
Attach the one with 5.08cm and set the grip distance to 7.6c
The test piece was fixed to a grip except for slack and tension as m. This is 17.7 N at a tensile speed of 10 cm / min.
(1.8 Kg) was stretched to the load, and the gripping interval at that time was measured. Next, it was immediately returned to the original gripping distance of 7.6 cm in the direction to remove the load. The behavior by the load-unloading was drawn as a load-elongation-recovery curve on a self-recording recorder (see FIG. 1). Based on this, the elongation rate LA is calculated by the following equation.
(%) Was determined and expressed as an average of three sheets. Elongation ratio LA (%) = [(L1−L) / L] × 100 L: gripping distance (mm) L1: gripping distance when extended to 17.7N (mm) Each of the vertical and horizontal directions of the knitted fabric , And the sum was further halved to obtain an average elongation rate.

(3) Average elongation recovery rate The elongation recovery rate LB (%) is based on the load-elongation-recovery curve drawn by the self-recording recorder, and shows the residual strain from the time when the recovery curve becomes zero load. The rate L2 (%) was obtained, and the elongation recovery rate LB (%) was calculated according to the following equation, and represented by the average value of three sheets. Elongation recovery rate LB (%) = (L3 / L1) × 100 The elongation recovery rates in the vertical and horizontal directions of the knitted fabric are added, and the added value is halved to obtain an average elongation recovery rate. .

(4) Bursting Strength This was carried out in accordance with JIS L 1018 “Knitted fabric test method”. Five test pieces of 15 mm × 15 mm are collected. With the test piece facing upward and in a normal state without applying tension, the test piece was attached to a Mullen-type burst tester, and the burst strength was measured.

(5) Bending Softness by Cantilever Method This was carried out according to JIS L 1018 “Knitted fabric test method”. Five test pieces each of 2 cm × 15 cm are collected in the vertical and horizontal directions. Using a cantilever type tester having a 45 ° slope at one end, the short side of one end of the test piece is adjusted to the reference of the scale on the slope side of the tester. The test piece is slid in the direction of the slope, and the position of the other end when one end of the test piece contacts the slope is read. The sliding length of the test piece is defined as the softness (mm). Evaluation is made based on the average value of 5 pieces each of vertical and horizontal. The smaller this value is, the softer it is.

(6) Wear Evaluation (Mobility During Wear) Each of the knitted fabrics was made into a slip as a women's underwear,
In a room at 20 ° C. and 65% RH, five adult female subjects
Using a treadmill, walking at 5 km / h was performed for 10 minutes while wearing outer garments, slips and underwear. Thereafter, the self-report of the subject was evaluated based on the following three-level evaluation of the ease of walking. Judgment display ：: very easy to move and easy to walk △: easy to move and easy to walk as well as normal slip ×: hard to move and difficult to walk

(7) Comprehensive evaluation Two levels were displayed as follows.

Example 1 The intrinsic viscosity (IV) was 1.4.
A homo-PTT having a melt viscosity of 750 poise at 0 and 275 ° C and a homo-PET having a melt viscosity of 650 poise at 275 ° C and an intrinsic viscosity (IV) of 0.60 and 275 ° C are separately melted. The mixture was discharged from the die at a compounding ratio (weight%) of 50:50, and was taken out at a spinning speed of 1400 m / min to obtain a side-by-side type composite structure undrawn yarn. Further, the film was stretched using a hot roll-hot plate stretching machine, and then continuously relaxed and wound up without being once taken out, to obtain a stretched yarn of 56 dtex 24 filaments (fiber cross section in FIG. 2A).

Using a 40G double-sided circular knitting machine, the above-mentioned PTT / PET side-by-side composite filament yarn is used for both the constituent yarns A and B in the knitting diagram of FIG. 3 and supplied to the yarn feeders F1 and F2 in the knitting diagram. The yarn was knitted to form an interlock structure knitted fabric composed of 100% PTT / PET side-by-side composite filament yarn.

The greige machine was subjected to a relaxation / scouring, dyeing and finishing set in accordance with the usual method of dyeing a circular polyester knitted fabric, and was set to 143 g / m ² , density 61 wale, 65
I got the knitted fabric of the course. The obtained knitted fabric was excellent in stretch characteristics, with the average elongation rate of vertical and horizontal lengths being 103% and the average elongation recovery rate being 82%. The bursting strength is 0.7 MPa, and the bending resistance by the cantilever method is 22 mm.
Met. The wearing evaluation result with the camisole made of this knitted fabric was also determined to be easy to move and excellent as underwear. Table 1 shows the detailed results.

Example 2 A PTT / PET side-by-side composite filament yarn (fiber cross section is a in FIG. 2) similar to that of Example 1 except that the fineness and the number of filaments were different, using a 33 decitex 12 filament and a 36G single filament Using a tricot machine, the side-by-side composite filament yarn of PTT / PET is arranged on the back side constituting yarn C in the knitting diagram of FIG. 4, and 33 decitex 24 filaments made of PET yarn are arranged on the front side constituting yarn d. The knitted fabric was knitted. The yarn mixing ratio (% by weight) in this knitted fabric design is 2% for the PTT / PET side-by-side composite yarn.
5% and 75% PET yarn.

The greige fabric was subjected to relaxation, scouring, dyeing and finishing setting in accordance with the usual polyester warp knitting and dyeing method to obtain a knitted fabric of 83 g / m ² , density of 66 wales and 78 courses. The obtained knitted fabric was excellent in stretch characteristics, with an average elongation of vertical and horizontal lengths of 92% and an average elongation recovery of 87%. In addition, the burst strength is also 0.
The bending resistance by the cantilever method at 32 MPa was 9 mm. The wearing evaluation result by the slip made of the knitted fabric was also judged to be easy to move and excellent as underwear. The detailed results are also shown in Table 1.

[Comparative Example 1] The same circular knitting machine as in Example 1 was used, and both the constituent yarns A and B in the knitting diagram of FIG. 3 used PET-processed yarn 56 decitex 12 filament yarn. , F2, and knitted an interlocked knitted fabric consisting of 100% normal yarn.

The greige fabric was subjected to the same dyeing method as in Example 1 to obtain a knitted fabric of 121 g / m ² , a density of 65 wales and 57 courses. The obtained knitted fabric had an average elongation recovery rate of 61% for the vertical and horizontal lengths, but an average elongation rate of 48%.
And poor stretch characteristics. In addition, although the burst strength was 0.65 MPa, the softness by the cantilever method was 32 mm, which was inferior to drape property. The wearing evaluation result by the slip made of this knitted fabric,
It was difficult to move and was judged to be unsuitable as underwear.
The detailed results are also shown in Table 1.

[Comparative Example 2] The same warp knitting machine as in Example 2 was used.
A PET yarn 33 decitex 24 filament yarn was arranged on the nt side constituent yarn 2, and a half-structure knitted fabric composed of 100% PET yarn was knitted.

The greige fabric was subjected to the same dyeing method as in Example 2 to obtain a knitted fabric of 71 g / m ² , density of 55 wales and 71 courses. The obtained knitted fabric was inferior in stretch characteristics, with an average elongation percentage of vertical and horizontal lengths of 48% and an average elongation recovery rate of 57%. In addition, burst strength is 0.21MP
a was inferior. The bending resistance according to the cantilever method was 11 mm. The wearing evaluation result by the slip made of the knitted fabric was determined to be difficult to move and unsuitable as underwear. The detailed results are also shown in Table 1.

[0063]

[Table 1]

[0064]

The underwear according to the present invention has an excellent elongation rate and elongation recovery rate as compared with conventional underwear, and also has sufficient bursting strength and drapeability as underwear, and is suitable for women to men. It can be applied to a wide range of fields and can be manufactured efficiently and at low cost.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a load-elongation recovery curve.

FIG. 2 is a model diagram showing an example of a fiber cross-sectional shape of a fiber used in the present invention.

FIG. 3 is a knitting diagram of a knitted fabric of Example 1 and Comparative Example 1.

FIG. 4 is a knitting diagram of a knitted fabric of Example 2 and Comparative Example 2.

[Explanation of symbols]

 L1: Elongation of the knitted fabric L2: Strain elongation of the knitted fabric L3: Recovery elongation of the knitted fabric a to g: Fiber cross-sectional shape F1 to F2: Yarn feeder NO of knitting machine I to C: Yarn of knitted fabric

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3B028 DA00 3B029 HA01 HB07 4L002 AA07 AB02 AB05 CA01 EA00 EA06 FA03

Claims (4)

[Claims] An average elongation in the vertical and horizontal directions is at least 55%, comprising 10% by weight or more of a composite yarn comprising a composite fiber filament in which different kinds of polyester polymers are bonded in a side-by-side manner along the fiber length direction. An undergarment comprising a knitted fabric having an average elongation recovery rate of 60% or more, and having a burst strength of the knitted fabric of 0.25 MPa or more and a softness by a cantilever method of 5 to 30 mm. 2. A composite fiber filament in which different kinds of polyester polymers are bonded in a side-by-side manner along a fiber length direction, wherein at least one of the different kinds of polyester polymers mainly comprises polytrimethylene terephthalate. Composite fiber filaments
An undergarment consisting of a knitted fabric containing 0% by weight or more, and having a burst strength of the knitted fabric of 0.25 MPa or more and a softness by a cantilever method of 5 to 30 mm. 3. The composite fiber filaments bonded in a side-by-side type have a single yarn fineness of 0.1 to 11 dtex and a total fineness of 22 to 193 dtex.
Or the underwear according to 2. 4. A knitted fabric having a density of 22 to 85 wells / inch and 28 to 138 courses / inch and a basis weight of 60.
Underwear according to claim 1 which is ~280g / m ^2.