JPH1150360A - Windbreaking knit fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a windbreaking knit fabric having a prescribed air- permeability and excellent appearance and feeling and useful for sports wear, etc., by hot-pressing the surface of a specific knit fabric. SOLUTION: The objective windbreaking knit fabric having an air- permeability of <=70 cc/cm<2> /sec is produced by hot-pressing at least one surface of a knit fabric having a cover factor of 7,000-40,000 and knit with a conjugate yarn obtained by doubling two or more kinds of filament yarns having softening point difference. Preferably, the fiber yarn constituting the conjugate yarn and having lower softening point is a POY of polyester multifilament.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a windproof knitted fabric for general clothing, sports clothing and the like.

[0002]

2. Description of the Related Art Generally, a knitted fabric has a very high air permeability as compared to a woven fabric or the like, and has a drawback that when it is used as an autumn / winter product, the wind easily passes and it is cold. A knitted garment having low air permeability can be obtained by knitting the knitted fabric at a high density. However, there is a limit in the design of a knitting machine, and there is a limit in a method of knitting at a high density to obtain a knitted fabric with reduced air permeability.

[0003] In order to eliminate the above-mentioned disadvantages of knitted garments,
Several methods have been proposed to reduce the air permeability of the knitted fabric. One of the methods is to coat the back surface of the knitted fabric with a resin or attach a film. For example, Japanese Utility Model Application Laid-Open No. 63-50891 discloses that a resin coating is applied to the surface of a high-gauge knitted fabric of a double-gauge knitted fabric composed of different gauges to reduce air permeability and impart windproofness and heat insulation. The knitted fabric is described. However, although this method has a great effect of reducing the air permeability, it has a drawback that the texture of the knitted fabric is made coarse and hard, and the inherent elasticity of the knitted fabric is also reduced.

[0004] Attempts to reduce air permeability by laminating a high-density woven fabric on the back surface of a knitted fabric are also known. Although the knitted fabric based on this idea has reduced air permeability, the knitted fabric is bulky and the original elasticity of the knitted fabric is also reduced. Japanese Patent Publication No. 58-7736
As described in Japanese Unexamined Patent Publication, a method of applying calendering to a knitted fabric is also known. In this method, the composite yarn of the elastic fiber yarn and the bulky crimped yarn is set as a weft and the stretched composite yarn is spread in the stitch by calendering the knitted fabric inserted between the stitches in the course direction. The idea is to close the gaps of the stitches to reduce the air permeability by subdividing the stitches. However, in this method, since the fabric is subjected to heat and pressure processing, the appearance, texture, and the like of the knitted fabric are impaired.

Japanese Utility Model Laid-Open Publication No. Hei 3-18191 discloses that a knitted fabric having a high shrinkage yarn on one surface and a low shrinkage yarn on the other surface is heat-treated and shrunk to obtain a knitted fabric with stitches. Thus, the idea of reducing the air permeability is disclosed. In this method, not only the texture of the knitted fabric layer made of the highly shrinkable yarn becomes rough but also the problem is that the original stretchability of the knitted fabric is reduced.

An attempt to use a highly crimped yarn as a constituent yarn of a knitted fabric is also known, for example, from Japanese Utility Model Publication No. Sho 62-11981. According to this known method, the inner layer loop and the outer layer loop of a double-sided knitted fabric are knitted with a high crimped yarn, and the voids in the knitted fabric structure are reduced by the high crimped yarn. According to this idea, a knitted fabric having a reduced air permeability can be obtained with a knitted fabric having a soft feel, but the effect of reducing the air permeability of the obtained knitted fabric is small.

[0007] Focusing on the thermoformability of POY fibers, POY
2. Description of the Related Art Molded fiber products are demanded in which resilience, dimensional stability and shape retention of shoulder pads, collar cores and the like using fibers are required as performance. Japanese Patent Application Laid-Open No. 9-31727 discloses a heat-moldable and heat-pressable functional molded product obtained by using such a molded product by using POY fiber or POY fiber composite yarn.

[0008]

SUMMARY OF THE INVENTION In view of the foregoing problems, the present invention provides a knitted garment having sufficient windproof performance without significantly changing the feel, appearance quality and knitted fabric characteristics of the knitted fabric. It is intended for.

[0009]

SUMMARY OF THE INVENTION According to the present invention, an air permeability of 70 is provided.
cc / cm ² / sec or less, a knitted fabric having a cover factor of 7000 to 40000 knitted with a composite yarn composed of two or more types of fiber yarns having a difference in softening point,
The composite yarn knitting at least one side of the knitted fabric is a windproof knitted fabric in which a part of the low softening point fiber yarn is flattened and a gap between stitches is closed to form a windproof structure. .

The windproof knitted fabric of the present invention comprises a knitted fabric having a cover factor of 7000 to 40,000 knitted by a composite yarn in which two or more types of fiber yarns having a difference in softening point are combined, and at least one surface thereof. Hot pressed, air permeability is 7
It can be prepared by processing a knitted fabric characterized by forming a knitted fabric of 0 cc / cm ² / sec or less.

Here, the air permeability of the windproof knitted fabric of the present invention is an air permeability according to the Frazier method specified in JIS L1096, and is 70 cc / cm ² / sec or less, preferably 50 cc / cm ² / sec or less. It is. If the air permeability exceeds 70 cc / cm ² / sec, when worn in the presence of a wind (especially a strong cold wind), a cold wind will enter the clothes, making it difficult to withstand the cold.

The knitted fabric referred to in the present invention is a one-layer or two-layer or more knitted fabric which can be knitted in various knitting structures such as a flat knit, a circular knit, and a warp knit.
The knitted fabric may be a further knitted fabric knitted by a structure such as a links knitted fabric, or a knitted fabric by an applied knitting structure such as a double or triple knitted fabric by such a structure. The knitted fabric may have a pattern structure.

The knitted fabric of the present invention is basically knitted with a composite yarn composed of two or more kinds of fiber yarns having a difference in softening point. The thickness of the composite yarn is preferably fineness or count generally used for knitted fabrics for clothing, for example, 50 to 500 denier yarn. The knitted fabric may be a knitted fabric obtained by cross-knitting other commonly used knitting yarns, as long as the knitting structure can form the above-mentioned windproof structure by the composite yarn. In this case, the fibers other than the composite yarn can use the constituent fiber yarns of the composite yarn, but it is preferable to use a yarn having a softening point equal to or less than the low softening point fiber yarn constituting the composite yarn. avoid. This is because a windproof knitted fabric prepared through hot press working of a knitted fabric described later causes texture hardening. The knitted fabric of the present invention requires that the knitted fabric layer including at least one side of the knitted ground be composed of a composite yarn composed of two or more types of fiber yarns having a difference in softening point, and a design of a knitted fabric structure. Depending on the case, the intermediate layer of the knitted fabric or the back surface thereof may not be constituted by the knitted structure knitted with the composite yarn.

The knitted ground cover factor of the present invention is 7
000-40000, preferably 10,000-3000
Set to 0. Here, the cover factor (K) is calculated by the following equation. K = W * C * √D In the formula, W represents the well density of the knitted fabric (books / inch), C represents the course density of the knitted fabric (books / inch), and D represents the thickness of the yarn (denier).

When the knitted fabric has a staggered or striped pattern and the different materials are exposed on the surface, W ₁ , W ₂ . . . . . . W _n , C ₁ ,
C ₂ . . . . . . C _n and D ₁ , D ₂ . . . . D _n is calculated by the following equation. K ₁ = W ₁ * C ₁ * √D ₁ K ₂ = W ₂ * C ₂ * √D ₂ . . . . . . . . . . . . . K _n = W _n * C _n * √D _n K = K ₁ + K ₂ +. . . . . If the _Kn cover factor is less than 7000, the knitted fabric structure having a predetermined level of air permeability cannot be obtained because the stitch is too coarse. If the cover factor exceeds 40,000, the knitted fabric may be too dense and fuzz may be generated to prevent knitting.

The cover factor of the knitted ground occupied by the composite yarn is at least 20% or more, preferably 30% or more, with respect to the cover factor of the knitted ground to be subjected to hot pressing.
% Or less. If it is less than 20%, the rate of filling the stitches by hot pressing is low, and a predetermined air permeability cannot be obtained.
Further, in the knitted fabric of the present invention, the fibers used in addition to the composite yarn may be the fibers listed in the composite yarn, but are preferably equal to or less than the low softening point yarn constituting the composite yarn. Avoid the use of softening point fiber yarns. This is because the texture of the entire knitted fabric tends to be hardened by hot pressing.

The composite yarn comprising two or more kinds of fiber yarns having a softening point difference referred to in the present invention comprises a low softening point fiber yarn and a high softening point fiber yarn.
The temperature is 0 ° C or higher, preferably 30 ° C or higher. The fiber yarns constituting this composite yarn can also be constituted by three or more fiber yarns as long as at least two yarns satisfy a softening point difference of 20 ° C. or more. When a hot press is applied to the knitted ground using the composite yarn, the low softening point yarn can be thermally deformed, and the stitch of the knitted fabric formed when knitting is performed by the action of the thermal deformation. , The air permeability of the as-knit fabric can be substantially reduced. The high-softening-point fiber yarn component of the composite yarn is a composite yarn component that maintains a soft feel because it is not significantly affected by the heat of a hot press such as a heat calender treatment of a knitted fabric. If the difference in softening points of the fiber yarns constituting the composite yarn is less than 20 ° C., the high and low softening point fiber yarns constituting the composite yarn are affected by heat by a heat press for reducing air permeability, and the texture of the knitted fabric is affected. Becomes harder.

The softening point referred to in the present invention is a temperature (Tm ° C.) at the time of occurrence of maximum thermal stress obtained from the relationship between temperature and stress by a thermal stress tester as a softening parameter (measurement conditions: Initial load 1 / 30g / d, heating rate 15
0 ° C / min). The softening point of the low softening point fiber yarn used in the present invention is 80 to 180 ° C, preferably 100 to 160 ° C. Low softening point fibers having a softening point of less than 80 ° C. cannot withstand the heat received in the process of preparing a windproof knitted fabric described below. If the softening point of the low softening point fiber exceeds 180 ° C., the fibers constituting the knitted fabric are yellowed or have a reduced strength due to heat during hot pressing.

Thermoplastic fibers, particularly undrawn yarns, semi-drawn yarns or copolymerized yarns of polyamides and polyesters, low-polymerized yarns, graft-polymerized yarns, different-polymer blended yarns, etc. are used as the low-softening fiber yarns. Preferred in terms of surface. More preferably, the polyester multifilament PO
Use Y fiber. POY fiber is highly oriented and has a low crystal structure, so it easily undergoes thermal deformation at low temperature, densifies the hot pressed surface layer and easily fills the gaps in the stitches. Excellent in workability, quality, etc. Further, the POY and the high softening point yarn are aligned and preliminarily processed to form a composite yarn having a core-in-sheath structure. The POY has a swelling feeling, and the effect of filling the stitches by hot pressing. Increase. Furthermore, the POY is subjected to relaxation heat treatment to impart spontaneous extensibility, and by performing the preliminary twisting similarly, the yarn length of the POY is increased, the swelling feeling is further increased, and the gaps of the stitches are easily filled.

This POY is a yarn spun at a take-up speed of 2000 m / min or more, preferably 2500 to 4000 m / min, and the fiber has a birefringence (Δn) of 0.02.
-0.08, preferably 0.03-0.05. If the birefringence is out of this range, the POY does not become spontaneously elongated yarn, so that the feeling of swelling is reduced and the filling of the stitches by hot pressing is reduced. The crystallinity of POY fiber is 30%.
The following is preferred. If it is larger than 30%, the heat deformability is inferior.

Further, the low softening point fiber yarn preferably has an irregular cross section. Elliptical,
Polygons such as triangles and squares, C shapes, Y shapes, H shapes, I shapes, L
Various irregular shapes such as a shape, a W shape, and a deformed type obtained by applying the same can be used, and a fiber yarn having a flat cross section such as a W shape or a flat shape is more preferably used. This is advantageous in that the flat cross-section fiber yarns are arranged in the surface direction, and the yarn voids and the stitches are further closed to reduce air permeability. The short / major diameter ratio of the flat section of the fiber is 0.15 or more, preferably 0.20 to 0.20.
0.80. If it is less than 0.15, spinning is difficult or yarn properties deteriorate.

On the other hand, the high softening point fiber yarn can be selected from natural fibers such as cotton, hemp, wool, and silk having no softening point, and synthetic fibers. Among them, a thermoplastic synthetic fiber multifilament yarn, preferably a polyester multifilament yarn is used. For example, single yarn denier is 0.5 ~
6 denier ordinary polyester multifilament yarn, polyester multifilament POY having a different Δn from POY described above, and cold drawn yarns thereof, so-called thick and thin yarn having an undrawn portion in the yarn axis direction, solid or hollow yarn Conjugate yarn of side-by-side type, eccentric type, etc., 6000 m / min, preferably 7000 m / min
The so-called high speed obtained by a spin take-up method in which spinning is performed at a winding speed of at least 4000 m / min or a spin draw-take-up method in which spinning-drawing-winding is performed in a series of steps at a winding speed of 4000 m / min or more, preferably 5000 m / min or more. There are polyester yarns for spinning, cold drawn yarns thereof, high shrinkage yarns having a boiling water shrinkage ratio of about 6 to 30 and so-called different shrinkage mixed fiber yarns composed of such high shrinkage yarns and low shrinkage yarns. You may mix two or more types.

Among them, the use of a high shrinkage yarn is more preferable.
This is effective in increasing the density of the knitted fabric by the heat treatment received during the processing step, and providing a swelling to the low softening point yarn serving as the sheath, thereby easily filling the stitches, and is effective in reducing the ventilation. Examples of the high shrinkage yarn include isophthalic acid, sulfoisophthalic acid, diethylene glycol, 2.2-bis@4- (2
-Hydroxyethoxy) phenyl @ propane
Ingredients are 2 to 12 mole% copolymerized sita polyester, cationic dyeable polyester having 1 to 4% dimethyl (5-sodium sulfo) isophthalic acid copolymerized or polybutylene terephthalate and ordinary polyethylene terephthalate (such as titanium oxide). Composite spinning (eg, conjugate yarn of side-by-side type, eccentric type, etc.) or spinning of polyester or the like obtained by copolymerizing other components having no cationic dyeing seat, including so-called semi-dull and full-dull yarns containing an eraser. There is a mixed fiber.

The fineness (thickness of the yarn) of a composite yarn comprising two or more types of fiber yarns having a difference in softening point can be appropriately selected depending on the application, but is generally used in a knitted fabric for clothing. It is selected from 50 to 500 denier. The fineness ratio of the low softening point fiber yarn / high softening point fiber yarn of the composite yarn is 0.5
To 5.0, preferably 1.0 to 3.0. When the fineness ratio is less than 0.5, the number of low softening point fiber yarns is too small, the heat press effect is small, and the effect of closing the stitch is insufficient, so that a predetermined low air permeability cannot be imparted to the knitted fabric. When the fineness ratio exceeds 5.0,
Although there are too many low softening point fiber yarns, the effect of hot pressing becomes large and the effect of closing the voids between stitches becomes large, but the appearance of the windproof knitted fabric is greatly impaired and the feel becomes hard.

The composite yarn is prepared by twisting, covering, air blending, false twisting, composite spinning, spinning blending, or the like. The form of the composite yarn is preferably a structure in which a low softening point fiber yarn is disposed around a high softening point fiber, that is, a core-sheath structure in which a high softening point yarn is provided in a core and a low softening point fiber yarn is provided in a sheath. When the core-sheath structure is adopted, the low softening point fiber yarn of the sheath portion is easily heated by hot pressing. That is, there is an obstruction effect that thermal deformation easily occurs and stitches of the knitted fabric are efficiently filled. on the other hand,
The fiber yarn having a high softening point at the core is hardly subjected to heat, and thus has an effect of hardening the texture and hardly causing damage to the yarn. As a composite yarn in which the core fiber is a high softening point fiber yarn, and the sheath fiber is a low softening point fiber yarn, a high shrinkage yarn on the core side and a low shrinkage yarn on the sheath side, a different shrinkage composite yarn, Alternatively, a hetero-shrinkable composite yarn in which the above combination is reversed in terms of shrinkability, a composite yarn in which a high feed fiber yarn is disposed in a sheath with a low feed fiber yarn as a core, and a high elongation yarn with a low elongation yarn as a core Techniques such as a composite yarn placed on a sheath can be used to prepare the composite yarn.

The fiber yarns constituting the composite yarns include a heat storage agent such as titanium nitride, zirconium carbide, titanium carbide, hafnium, tantalum, antimony-containing tin oxide, indium-containing tin oxide, carbon, etc. at the spinning stage depending on the application and use form. , Zirconia, alumina, silica, titanium oxide,
UV shielding agents such as barium sulfate, calcium carbonate, boron nitride, strontium aluminate, and zinc sulfide; coloring agents such as pigments; heat-resistant agents such as copper oxide; other antistatic agents; phosphorescent agents; antibacterial agents; Substances and fine powders can be added to make the composite yarn have an additional function.

In the windproof knitted fabric of the present invention, a knitted fabric containing a composite yarn is subjected to hot pressing on at least one side of the knitted ground. By this hot pressing, the low softening point fiber yarns constituting the composite yarns on the surface of the knitted fabric are thermally deformed to be flattened and densified, and substantially close the inter-thread voids and stitches on the knitted fabric surface, and The fiber filling degree of the surface layer portion of the knitted fabric is increased to reduce the air permeability to a predetermined value. The flattening of fiber yarns
It mainly indicates that the yarn itself is flattened, but a part of the single fiber in the yarn configuration may be flattened due to thermal deformation.
Also, since the heat press works effectively only on the low softening point fiber yarns constituting the composite yarn, the high softening point fiber yarns constituting the composite yarn and the middle layer and the back layer of the knitted fabric are less affected by heat. No impact, almost the initial texture (before hot pressing) is maintained, and the strength is hardly reduced. Further, a knitted fabric that does not significantly impair the change in appearance can be obtained.

In the hot pressing process, one is heated and the other is at low temperature
Processing by pressing between rolls, belts, flat plates, etc.
However, from the viewpoint of workability, one is a metal heating roll and the other is
Hard low-temperature paper roll made of metal, resin, etc.
Is made of medium soft low-temperature rolls such as rubber and felt.
It is preferable to use a general calendering machine. This heat pump
The condition of the heating side is the temperature of the heating side surface (T₁° C) is T
m + 80> T ₁> Tm-10, preferably Tm + 60>
T₁> Tm (Tm is low softening of the composite yarn)
Represents the temperature of the softening parameter of the dotted yarn). T₁Is Tm
Above + 80 ° C, the low softening point yarn becomes too soft and after processing
The texture becomes coarse and hard and the appearance is impaired. T₁Is Tm-1
Below 0 ° C, the low softening point yarn becomes insufficiently softened, causing thermal deformation.
Flattening and densification cannot be achieved without this. Also, the temperature of the low temperature side
(T_Two° C) is T₁-30> T_Two Preferably T₁-5
0> T_TwoAnd T_TwoAbove T1-30 ° C, the whole knitted fabric
The texture became rough and hard because the body was affected by high temperature heat
Or impair the appearance. The pressurization is performed as a linear pressure of 1
0 to 150 kgf / cm, preferably 30 to 100 kg
f / cm. Low softness when linear pressure is 10Kgf / cm or less
Flattening and densification of the knitting point yarn are insufficient, and the ventilation cannot be reduced.
When the linear pressure is 150 kgf / cm or more, the whole knitted fabric is crushed.
As a result, the texture is rough and the appearance is impaired. As processing speed
Is 3 to 30 m / min, preferably 5 to 20 m / min
And Poor productivity when processing speed is 3m / min or less
At 30m / min or more, hot press spots are generated and appearance
Degrades quality and performance. In addition, this hot press is heated side
Is usually processed with a flat material.
If you want to change the appearance or change the appearance or pattern,
Processing with uneven texture (embossing in general)
May be performed.

This hot pressing step is usually performed after dyeing (including printing), but may be performed after scouring before dyeing. In the knitted fabric of the present invention, the hot-pressed surface may be used upside down or upside down, depending on the application and use form. In addition, the knitted fabric of the present invention has a water absorbing agent, a water repellent agent, a heat storage agent, an ultraviolet ray shielding or absorbing agent depending on the use and use form,
The function may be imparted by various processes such as an antistatic agent, an antibacterial agent, a deodorant, an insect repellent, a phosphorescent agent, and a retroreflective agent.

The windproof knitted fabric of the present invention obtained by the above-mentioned structure can achieve the target low air permeability while maintaining the stretch characteristics of the knitted fabric with almost no impairment in texture and appearance. As a fall / winter material for sports apparel including general apparel use, it is extremely excellent in windproofness and wearing comfort.

[0031]

EXAMPLES Examples of the present invention will be described below in comparison with comparative examples. In the following examples (comparative examples), the texture was evaluated by touch and the appearance was evaluated by visual observation. The evaluation display of the judgment was as follows. (1) Texture evaluation criteria ○ Almost the same as knitted fabric △ slightly harder than knitted fabric × hardened (2) Evaluation criteria of appearance ○ hardly changed from knitted fabric △ slightly changed × changed [Examples 1 to 2, Comparative Examples 1-4] As a high softening point fiber yarn, a normal polyester drawn yarn 30d / 12f (softening parameter 185 ° C) and a low softening point fiber yarn 35
Polyester POY spun at a winding speed of 00 m / min
Combining a 75d / 48f round cross section (Δn = 0.043, softening parameter 95 ° C.) with a fiber yarn, and a normal polyester drawn yarn 75d / 48f round cross section (softening parameter 187 ° C.) instead of the POY fiber for comparison, After interlace processing, simultaneous temporary processing (1 heater 165 ° C processing)
To obtain a false twist yarn with a different elongation. The obtained composite yarn was 28
The knitted fabric was knitted with a gauge circular knitting machine and then knitted with a scouring dyeing finish.

Each of the knitted fabrics has a single side of 80 ° C. and 120 ° C.
℃, 160 ℃, 200 ℃ metal heat roll, the other is 6
Using a paper roll made of resin at 0 ° C, a linear pressure of 90 kg /
The single-sided thermal calendering was performed at a processing speed of 10 m / min. As shown in the test results in Table 1, in the examples of the present invention, the feeling and the appearance change were good and the effect of reducing air permeability was large.

[0033]

[Table 1]

[Comparative Example 5] A knitted fabric having the same structure as that of the above-described embodiment was prepared by heating both rolls at 160 ° C.
The two-sided thermal calendering was performed at a linear pressure of 90 kg / cm at a temperature of 10 ° C. and a speed of 10 m / min. As shown in the test results in Table 1, the effect of reducing the ventilation was large, but the texture and the appearance change were large. [Examples 3-5, Comparative Examples 6-7] As a high softening point fiber yarn, a normal polyester drawn yarn 30d / 12f (softening parameter 185 ° C) and a low softening point fiber yarn of 33 were used.
Polyester POY spun at a winding speed of 00 m / min
75d / 30fW type cross section, short / long diameter ratio of fiber cross section 0.3
5, using a yarn having Δn = 0.047 and softening parameter of 98 ° C.), interlacing was performed simultaneously with the provisional tempering (processing at 1 heater at 165 ° C.) to prepare a false-twist false twist composite yarn. The knitted fabric was knitted with a 22, 28 and 32 gauge circular knitting machine, and the composite yarn was scoured and dyed.
The knitted fabric of the cover factor shown in was created.

The knitted fabric was subjected to single-sided heat calendering at a linear pressure of 90 kg / cm and a processing speed of 10 m / min using a metal hot roll at 160 ° C. on one side and a resin paper roll at 60 ° C. on the other side. . The test results are shown in Table 2,
In the examples of the present invention, the texture and the appearance change were good and the effect of reducing air permeability was large.

[0036]

[Table 2]

Examples 6 to 8, Comparative Example 8 As a high softening point fiber yarn, a normal polyester drawn yarn 30d / 12f was used.
(Softening parameter: 185 ° C.) and the short / major diameter ratio of the cross section of the polyester POY 75d / 30fW type cross-section fiber (softening parameter: 98 ° C.) spun at a winding speed of 3300 m / min as a low softening point fiber yarn, respectively. ,
Using the yarns composed of 0.18, 0.71 and 0.80, after the interlace processing, simultaneous twisting (1 heater 16
5 ° C.) to obtain a false twist composite yarn. After knitting these composite yarns with a 28 gauge circular knitting machine,
A knitted fabric subjected to scouring and dyeing was prepared. The knitted fabric was subjected to single-sided heat calendering at a linear pressure of 90 kg / cm and a processing speed of 10 m / min using a metal hot roll at 160 ° C. on one side and a resin paper roll at 60 ° C. on the other side.
Table 3 shows the test results. The knitted fabric of the example of the present invention has a good texture and change in appearance and has a large effect of reducing air permeability.

[0038]

[Table 3]

Examples 9 to 11 and Comparative Examples 9 to 10 As a high softening point fiber yarn, ηsp / c = 0.22 containing 2.2 mol% of dimethyl (5-sodium sulfo) isophthalate was used.
57, ηsp / c = 0.70 not containing polyester and copolymer containing 0.2% titanium oxide, 0.2% titanium oxide
The normal polyesters contained are separately melted and mixed at a mixing ratio of 1:
The composite was formed into a side-by-side and spun and wound. Subsequently, it was drawn to obtain a polyester conjugate yarn having a circular cross section of 50d / 12f (softening parameter: 164 ° C). Polyester POY 75d / 30fW type cross section fiber spun as a low softening point fiber yarn at a winding speed of 3300 m / min (softening parameter 98 ° C, cross section short / major diameter ratio 0.1
35) Using the yarn, the fineness ratio of low softening point fiber yarn / high softening point fiber yarn is 0.40, 0.60, 2.00, 4.17.
And 5.83, and interlacing was performed at the same time (1 heater at 165 ° C.) to obtain a composite yarn.
Using these composite yarns, a knitted fabric was knitted with a 28 gauge circular knitting machine and then knitted with a scouring finish. A linear pressure of 90 ° C. was applied to the knitted fabric using a metal hot roll at 160 ° C. on one side and a resin paper roll at 60 ° C. on the other side.
The single-sided heat calendering was performed at a processing speed of 10 m / min at kg / cm. Table 4 shows the test results. The knitted fabric of the example of the present invention has a good texture and change in appearance and has a large effect of reducing air permeability.

[0040]

[Table 4]

Example 12 As a high softening point fiber yarn,
The same polyester conjugate yarn 50 as in Example 9 above
d / 12f (softening parameter: 164 ° C.) and a polyester POY75d / 30fW type cross section fiber spun as a low softening point fiber yarn at a winding speed of 3300 m / min (softening parameter: 98 ° C., short / long diameter ratio of cross section: 0.35 ) Using the yarn, a composite yarn A was prepared in which both yarns were interlaced and then simultaneously twisted (processing at 165 ° C with one heater). on the other hand,
Ordinary polyester drawn yarn 150d / 60fW cross section fiber (short / long diameter ratio of cross section 0.32 Softening parameter 183
Temporary twisted yarn B (1 heater at 175 ° C). These yarns were inlaid on the outer fabric in a staggered pattern using a 24-gauge single circular knitting machine using a composite yarn A for the outer fabric and a processing yarn B for the lining. After knitting, a two-layer knitted fabric subjected to scouring and dyeing was prepared. The knitted fabric was subjected to single-sided heat calendering at a linear pressure of 90 kg / cm and a processing speed of 10 m / min using a metal hot roll at 160 ° C. on one side and a resin paper roll at 60 ° C. on the other side. Table 5 shows the test results. The knitted fabric of the example of the present invention has a good texture and change in appearance and has a large effect of reducing air permeability.

[0042]

[Table 5]

[Examples 13 and 14, Comparative Example 11] Ordinary polyester drawn yarn 50d / 2 as a high softening point fiber yarn
4f (softening parameter 185 ° C) and 75d / 30fW type cross section (short / long diameter ratio 0.33, softening parameter 1)
83 ° C.), a composite yarn C was prepared in which both yarns were interlaced and then subjected to simultaneous false twisting (processing at 165 ° C. with one heater). Using the composite yarn C, the composite yarn A prepared in Example 12, and the temporary twisted yarn B, the composite yarns A and C were 1: 1, 1: 1:
The fabric is knitted at a ratio of 2: 1: 3, and the knitted fabric is knitted. The lining is made of a processing yarn B. The stitches are inlaid in a staggered pattern with two stitches using a twisted yarn B. Performed two-layer knitted fabric. The knitted fabric was calendered under the same conditions as in Example 12. Table 5 shows the test results. The knitted fabric of the example of the present invention has a good texture and change in appearance and has a large effect of reducing air permeability.

[0044]

As described above, the windproof knitted fabric of the present invention can realize low air permeability without substantially impairing the appearance, texture and knitted fabric characteristics, and is extremely excellent in windproofness for autumn and winter items. , With high commercial value.

Claims (5)

[Claims] 1. A knitted yarn composed of two or more types of fiber yarns having an air permeability of 70 cc / cm ² / sec or less and a softening point difference, and a cover factor of 7000 to 40
000, and the composite yarn knitting on at least one side of the knitted fabric has a part of the low softening point fiber yarn flattened, and forms a windproof structure by closing a gap between stitches. Windproof knitted fabric. 2. The windproof knitted fabric according to claim 1, wherein one of the low softening point fiber yarns constituting the composite yarn is made of polyester multifilament POY. 3. The windproof knitted fabric according to claim 1, wherein one of the low softening point fiber yarns constituting the composite yarn is formed of a modified cross-section yarn. 4. A cover factor knitted by a composite yarn in which two or more fiber yarns having a difference in softening point are composited has a cover factor of 70.
A method for producing a windproof knitted fabric, which comprises hot-pressing at least one side of a knitted fabric having a thickness of 100 to 40,000 to form a knitted fabric having an air permeability of 70 cc / cm ² / sec or less. 5. The method for producing a windproof knitted fabric according to claim 4, wherein one of the low softening point fiber yarns constituting the composite yarn is made of polyester multifilament POY.