JP4902220B2 - Windproof knitted fabric and textile products - Google Patents

Description

  The present invention relates to a windproof knitted fabric and a fiber product having a multifilament yarn having a single fiber diameter of 1000 nm or less and having excellent lightness and windproof properties.

  In general, knitted fabrics are superior in soft texture and stretchability compared to woven fabrics and the like, and are widely used for general clothing and sports clothing. On the other hand, since the knitted fabric has higher air permeability than the woven fabric, when used as an autumn / winter product, the knitted fabric has a drawback that it is easy to pass wind and is cold.

  In order to eliminate this drawback, several methods for improving the windproof property of the knitted fabric have been proposed. For example, a method of coating a resin or pasting a film on the back of a knitted fabric, a method of increasing windproof by laminating a high-density fabric on the back of a knitted fabric, using high shrinkage fibers or different shrinkage mixed yarns A method of knitting a high-density knitted fabric is known (see, for example, Patent Document 1, Patent Document 2, Patent Document 3, Patent Document 4, and Patent Document 5).

However, these knitted fabrics have a problem that the fabric becomes heavier and the texture becomes harder, and knitted fabrics having excellent lightness and windproof properties similar to those of fabrics have not been proposed.
Patent Document 6 proposes a sea-island type composite fiber having a fiber diameter of several tens of nanometers and a method for producing the same.

JP 2000-256948 A JP 2002-363443 A Japanese Patent Laid-Open No. 7-197254 JP-A-10-53940 JP 2000-170061 A International Publication No. 2005/095686 Pamphlet

  This invention is made | formed in view of said background, The objective is to provide the windproof knitted fabric and textiles which have the outstanding lightweight property and windproof property.

  As a result of intensive studies to achieve the above problems, the present inventors have used a multifilament yarn made of organic fibers and having a single fiber diameter of 1000 nm or less, and the total fineness and knitting density of the yarn are within a specific range. As a result, it has been found that a windproof knitted fabric having excellent lightness and windproof properties can be obtained, and the present invention has been completed by intensive studies.

Thus, according to the present invention, “a knitted fabric comprising 20% by weight or more of multifilament yarns made of organic fibers and having a single fiber diameter of 1000 nm or less, satisfying the following formula , and the number of single yarns of the multifilament yarns” Is provided. ”.
D ^1/2 × Co × We ≧ 25000
However, D is the total fineness (dtex) of the multifilament yarn, Co is the number of courses per 2.54 cm, and We is the number of wales per 2.54 cm.

In that case, it is preferable that the said multifilament yarn melt | dissolves and removes the sea component of a sea-island type composite fiber. The multifilament yarn is preferably made of polyester fiber.

In the windproof knitted fabric of the present invention, the knitted fabric preferably has a multilayer structure of two or more layers. In that case, it is preferable that a knitted fabric is comprised only with the said multifilament yarn. The knitted fabric includes polyester false twist crimped yarn as other yarn, at least one layer is composed of the multifilament yarn, and at least one layer is composed of the polyester false twist crimped yarn. It is preferred that Moreover, it is preferable that an elastic yarn is included as another yarn in the knitted fabric, and the multifilament yarn and the elastic yarn are knitted. Moreover, it is preferable that the knitted fabric surface is heat-pressed. Moreover, it is preferable that a fabric weight is 150 g / m < ² > or less. Moreover, it is preferable that air permeability is 30 cc / cm < ² > / s or less.

  Further, according to the present invention, the outer garment, the sports garment, the inner garment, the shoe material, the medical / hygiene products of diapers and care sheets, the bedding, the chair, Any textile product selected from the group consisting of sofa skins, carpets, car seats and interior goods is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the windproof knitted fabric and textiles which have the lightness and windproof property outstanding as the textile fabric are obtained.

Hereinafter, embodiments of the present invention will be described in detail.
First, in the knitted fabric of the present invention, a multifilament yarn (hereinafter sometimes referred to as nanofiber) having a single fiber diameter (single fiber diameter) of 1000 nm or less (preferably 100 to 800 nm) is included in the knitted fabric weight. On the other hand, it is important that 20% by weight or more (preferably 30 to 90% by weight) is contained. When the single fiber diameter is converted into a single yarn fineness, it corresponds to 0.01 dtex or less. When the single fiber diameter is larger than 1000 nm, the inter-fiber voids become large, and a sufficient windproof property cannot be obtained. Here, when the cross-sectional shape of the single fiber is an atypical cross section other than the round cross section, the diameter converted to the round cross section is defined as the single fiber diameter. The single fiber diameter can be measured by photographing the cross section of the fiber with a transmission electron microscope.

In such a multifilament yarn, the total fineness is not particularly limited, but is preferably 100 dtex or less (more preferably 10 to 60 dtex). When the total fineness is larger than 100 dtex, the single yarn of the multifilament yarn (nanofiber) is difficult to spread, and as a result, there is a possibility that sufficient windproof property may not be obtained.
In such a multifilament yarn, the number of single yarns is not particularly limited, but is preferably 500 or more (more preferably 2000 to 10,000) in terms of windproof properties.

  The types of fibers forming such multifilament yarns (nanofibers) include: regenerated fibers such as rayon, semi-synthetic fibers such as acetate, polyester fibers such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, and polylactic acid. Examples thereof include synthetic fibers such as polyester fibers, polyether ester fibers, acrylic fibers, nylon fibers, and aramid fibers obtained by copolymerizing the third component. These fibers may be one type or a plurality of combinations. Of these, polyester fibers are preferred from the viewpoint of recyclability. In addition, in such fibers, a fine pore forming agent, a cationic dye dyeing agent, a coloring inhibitor, a heat stabilizer, a fluorescent brightening agent, a matting agent may be added as necessary within the range not impairing the object of the present invention. 1 type, or 2 or more types of a coloring agent, a hygroscopic agent, and inorganic fine particles may be contained.

  In the windproof knitted fabric of the present invention, when other yarns other than the above-mentioned multifilament yarns are included, the fiber type of the other yarns is not limited, but polyester fiber yarns are preferable in terms of recyclability. Of these, polyester fiber yarns that have been subjected to false twist crimping are particularly preferred for obtaining excellent windproof properties.

Next, in the windproof knitted fabric of the present invention, it is important to satisfy the following formula.
D ^1/2 × Co × We ≧ 25000 (preferably D ^1/2 × Co × We ≧ 30000)
Here, D is the total fineness (dtex) of the multifilament yarn (nanofiber), Co is the number of courses per 2.54 cm, and We is the number of wales per 2.54 cm.
Here, if the value of D ^1/2 × Co × We is smaller than 25000, it is not preferable because sufficient windproof properties cannot be obtained.

  In the windproof knitted fabric of the present invention, the knitting structure is not particularly limited, and may be a weft knitted fabric or a warp knitted fabric. Preferable examples of the weft knitting structure include flat knitting, rubber knitting, double-sided knitting, pearl knitting, tack knitting, floating knitting, one-side knitting, lace knitting, and bristle knitting. Examples of the warp knitting structure include a single denby knitting, a single atlas knitting, a double cord knitting, a half tricot knitting, a back hair knitting, and a jacquard knitting. The number of layers of the knitted fabric may be a single layer, but a multilayer of two or more layers is preferable in terms of windproof properties. For example, it is preferable that the knitted fabric has a multilayer structure of two or more layers and is constituted only by the multifilament yarn. Further, it is preferable that the knitted fabric has a multilayer structure of two or more layers, at least one layer is constituted by the multifilament yarn, and at least one layer is constituted by a polyester false twist crimped yarn which is another yarn. . Moreover, it is preferable that an elastic yarn is included as another yarn in the knitted fabric, and the multifilament yarn and the elastic yarn are knitted.

  The windproof knitted fabric of the present invention can be produced, for example, by the following production method. That is, first, the following sea-island type composite fiber is obtained. In such a sea-island type composite fiber, the polymer constituting the fiber is arbitrary as long as the sea component polymer is a combination having higher solubility than the island component polymer, but the dissolution rate ratio (sea / island) is particularly 200 or more. Preferably there is. When the dissolution rate ratio is less than 200, part of the island component of the fiber cross-section surface layer portion is dissolved while the sea component of the fiber cross-section central portion is dissolved, so the sea component is completely dissolved and removed. For this reason, the island component is reduced by a percentage, and strength deterioration due to the thickness variation of the island component and solvent erosion occurs, and problems such as fluff and pilling are likely to occur.

  The sea component polymer may be any polymer as long as the dissolution rate ratio with respect to the island component is 200 or more, but polyesters, polyamides, polystyrenes, polyethylenes, and the like having good fiber forming properties are particularly preferable. For example, as an easily soluble polymer in an alkaline aqueous solution, polylactic acid, an ultra-high molecular weight polyalkylene oxide condensation polymer, a polyethylene glycol compound copolymer polyester, a copolymer polyester of polyethylene glycol compound and 5-sodium sulfonic acid isophthalic acid may be used. Is preferred. Nylon 6 is soluble in formic acid, and polystyrene and polyethylene are very well soluble in organic solvents such as toluene. Among them, in order to achieve both easy alkali solubility and sea-island cross-section formability, the polyester-based polymer is 3 to 10% by weight of polyethylene glycol having 6 to 12 mol% of 5-sodium sulfoisophthalic acid and a molecular weight of 4000 to 12000. % Copolymerized polyethylene terephthalate copolymer polyester having an intrinsic viscosity of 0.4 to 0.6 is preferred. Here, 5-sodium isophthalic acid contributes to improving hydrophilicity and melt viscosity, and polyethylene glycol (PEG) improves hydrophilicity. PEG has a higher hydrophilicity effect, which is thought to be due to its higher order structure, as the molecular weight increases, but it is preferable from the viewpoints of heat resistance and spinning stability because the reactivity becomes poor and a blend system is formed. Disappear. On the other hand, when the copolymerization amount is 10% by weight or more, it is difficult to achieve the object of the present invention because of its inherently low melt viscosity. Therefore, it is preferable to copolymerize both components within the above range.

  On the other hand, the island component polymer may be any polyester polymer as long as there is a difference in dissolution rate from the sea component, but as described above, fiber-forming polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polylactic acid, Polyester such as polyester copolymerized with the third component is preferred. In the polymer, a fine pore forming agent, a cationic dye dyeing agent, an anti-coloring agent, a heat stabilizer, a fluorescent whitening agent, a matting agent, a coloring agent may be added as necessary within the range not impairing the object of the present invention. 1 type, or 2 or more types of an agent, a hygroscopic agent, and inorganic fine particles may be contained.

  The sea-island composite fiber composed of the sea component polymer and the island component polymer preferably has a sea component melt viscosity higher than that of the island component polymer during melt spinning. In such a relationship, even if the composite weight ratio of the sea component is less than 40%, the islands are joined together, or the majority of the island components are joined to be different from the sea-island type composite fiber. hard.

  A preferred melt viscosity ratio (sea / island) is in the range of 1.1 to 2.0, especially 1.3 to 1.5. If this ratio is less than 1.1 times, the island components are likely to be joined during melt spinning, whereas if it exceeds 2.0 times, the viscosity difference is too large and the spinning tone tends to be lowered.

  Next, the greater the number of islands, the higher the productivity when producing ultrafine fibers by dissolving and removing sea components, and the fineness of the resulting nanofibers becomes remarkable, and the softness and smoothness that is unique to nanofibers. It is preferable that it is 100 or more (more preferably 300 to 1000) in that it can be expressed. Here, when the number of islands is less than 100, there is a possibility that even if the sea component is dissolved and removed, a high multifilament yarn composed of a single yarn having a very fineness cannot be obtained and the object of the present invention cannot be achieved. is there. If the number of islands is too large, not only the manufacturing cost of the spinneret increases, but also the processing accuracy itself tends to decrease.

  Next, the diameter of the island component needs to be 1000 nm or less (preferably 10 to 1000 nm). Further, each island in the cross section of the sea-island composite fiber is more preferable as the diameter is uniform because the quality and durability of the knitted fabric obtained by removing the sea components are improved.

  In the sea-island composite fiber, the sea-island composite weight ratio (sea: island) is preferably in the range of 40:60 to 5:95, and particularly preferably in the range of 30:70 to 10:90. Within such a range, the thickness of the sea component between the islands can be reduced, the sea component can be easily dissolved and removed, and the conversion of the island component into ultrafine fibers is facilitated. Here, when the proportion of the sea component exceeds 40%, the thickness of the sea component becomes too thick. On the other hand, when the proportion is less than 5%, the amount of the sea component becomes too small, and joining between the islands easily occurs.

  In the above-mentioned sea-island type composite fiber, the thickness of the sea component between the islands is suitably 500 nm or less, particularly in the range of 20 to 200 nm. When the thickness exceeds 500 nm, the thick sea component is dissolved and removed. As the dissolution of the components progresses, not only the homogeneity between the island components decreases, but defects and dyeing spots such as fuzz and pilling are likely to occur.

  The sea-island type composite fiber can be easily produced, for example, by the following method. That is, first, a polymer having a high melt viscosity and an easily soluble polymer and a polymer having a low melt viscosity and a hardly soluble polymer are melt-spun so that the former is a sea component and the latter is an island component. Here, the relationship between the melt viscosity of the sea component and the island component is important.If the ratio of the sea component decreases and the thickness between the islands decreases, if the melt viscosity of the sea component is small, some of the flow paths between the islands This is not preferable because sea components flow at high speed and joining between islands easily occurs.

  As the spinneret used for melt spinning, any one such as a hollow pin group for forming an island component or a group having a fine hole group can be used. For example, any spinneret that forms a cross section of the sea island by joining the island component extruded from the hollow pin or the fine hole and the sea component flow designed to fill the gap between the sea component flow may be used. . Examples of spinnerets that are preferably used are shown in FIGS. 1 and 2, but are not necessarily limited thereto. FIG. 1 shows a method in which hollow pins are discharged into the sea component resin reservoir portion and merged and compressed. FIG. 2 shows a method in which islands are formed by a fine hole method instead of hollow pins.

  The discharged sea-island type cross-section composite fiber is solidified by cooling air, and is preferably wound after being melt-spun at 400 to 6000 m / min. The obtained undrawn yarn is made into a composite fiber having desired strength, elongation, and heat shrinkage properties through a separate drawing process, or is taken up by a roller at a constant speed without being wound once, and subsequently drawn. Any of the methods of winding after passing through may be used.

  Here, in order to produce a sea-island type composite fiber having a particularly fine island diameter with high efficiency, the fiber structure is not changed prior to neck stretching (orientation crystallization stretching) with ordinary so-called orientation crystallization. It is preferable to employ a fluid stretching process in which only the diameter is extremely reduced. In order to facilitate fluid drawing, it is preferable to preheat the fiber uniformly using an aqueous medium having a large heat capacity and draw at a low speed. By doing so, it becomes easy to form a fluid state at the time of stretching, and it can be easily stretched without development of the fine structure of the fiber. In this process, both the sea component and the island component are preferably polymers having a glass transition temperature of 100 ° C. or less, and particularly suitable for polyesters such as polyethylene terephthalate, polybutylene terephthalate, polylactic acid, and polytrimethylene terephthalate. Specifically, it is immersed in a hot water bath in the range of 60 to 100 ° C., preferably 60 to 80 ° C., and uniformly heated, the draw ratio is 10 to 30 times, the supply speed is 1 to 10 m / min, and the winding speed is It is preferable to carry out in the range of 300 m / min or less, particularly 10 to 300 m / min. If the preheating temperature is insufficient and the stretching speed is too high, the desired high-magnification stretching cannot be achieved.

  The drawn yarn drawn in the fluidized state is oriented, crystallized and drawn at a temperature of 60 to 220 ° C. in accordance with a conventional method in order to improve mechanical properties such as the strength and elongation. If the drawing conditions are outside this range, the properties of the resulting fiber will be insufficient. The draw ratio varies depending on the melt spinning conditions, flow stretching conditions, orientation crystallization stretching conditions, etc., but is 0.6 to 0.95 times the maximum draw ratio that can be stretched under the orientation crystallization stretching conditions. What is necessary is just to extend | stretch.

The sea-island composite fiber described above is untwisted or retwisted as necessary, and after knitting a knitted fabric with other yarns as necessary, the sea components are dissolved and removed with an alkaline aqueous solution. At that time, a multifilament yarn having a single fiber diameter of 1000 nm or less (that is, the island component) is contained in the knitted fabric in an amount of 20% by weight or more and satisfies the following formula.
D ^1/2 × Co × We ≧ 25000
However, D is the total fineness (dtex) of the multifilament yarn, Co is the number of courses per 2.54 cm, and We is the number of wales per 2.54 cm. Further, the number of single yarns of the multifilament yarn is calculated from the number of single yarns before the sea component is dissolved and removed with an alkaline aqueous solution and the record of the island components.

  In addition, you may give a dyeing process before and / or after the melt | dissolution removal process of the sea component by the said alkaline aqueous solution. In addition, conventional processing such as hydrophilic processing, brushed processing, ultraviolet shielding or antistatic agent, and various processing that provides functions such as antibacterial agent, deodorant agent, insect repellent agent, phosphorescent agent, retroreflective agent, negative ion generator, etc. May be additionally applied.

The knitted fabric thus obtained has excellent windproof properties and light weight. In particular, when the surface of the knitted fabric is subjected to heat and pressure processing (calendar processing), wind resistance is improved, which is preferable. Such windproof property is preferably air permeability and 30 cc / cm ² / s or less. As the light weight, it is preferable 150 g / ^{m 2} or less (more preferably 50~130g / ^{m 2)} is in basis weight.

  Next, the textile product of the present invention uses the above windproof knitted fabric, outer clothing, sports clothing, inner clothing, shoe materials, medical and hygiene products such as diapers and nursing sheets, bedding bedding, It is a textile product selected from the group consisting of skin materials such as chairs and sofas, carpets, car seats, and interior goods. Such a textile product includes the above windproof knitted fabric, and thus has excellent windproof properties and light weight.

Next, although the Example and comparative example of this invention are explained in full detail, this invention is not limited by these. In addition, each measurement item in an Example was measured with the following method.
<Melting viscosity> The polymer after drying is set in the orifice set to the ruder melting temperature at the time of spinning, melted and held for 5 minutes, extruded with several levels of load, and the shear rate and melt viscosity at that time are plotted. To do. By gently connecting the plots, a shear rate-melt viscosity curve is created, and the melt viscosity when the shear rate is 1000 sec- ¹ is observed.
<Dissolution rate> The yarn is wound up at a spinning speed of 1000 to 2000 m / min with a 0.3φ-0.6L × 24H base of each of the sea and island components, and the residual elongation is in the range of 30 to 60%. To produce a 84 dtex / 24 fil multifilament. The weight loss rate was calculated from the dissolution time and the dissolution amount at a bath ratio of 100 at a temperature at which the solvent was dissolved in each solvent.
<Mass weight> It was measured according to JIS L1096 6.4.2.

[Example 1]
Polyethylene terephthalate (melting viscosity at 280 ° C. at 280 ° C.) as an island component, polyethylene terephthalate (melting at 280 ° C.) copolymerized with 6 mol% of 5-sodium sulfoisophthalic acid and 6% by weight of polyethylene glycol having a number average molecular weight of 4000 as a sea component Viscosity is 1750 poise) (dissolution rate ratio (sea / island) = 230), sea: island = 30: 70, number of islands = 836 sea-island type composite undrawn fiber, spinning temperature: 280 ° C., spinning speed: 1500 m / It was melt-spun in minutes and wound up once.

  The obtained undrawn yarn was roller-drawn at a drawing temperature of 80 ° C. and a draw ratio of 2.5 times, and then heat-set at 150 ° C. and wound up. The obtained sea-island type composite drawn yarn was 50 dtex / 10 fil and the cross section of the fiber was observed with a transmission electron microscope TEM. As a result, the shape of the island was round and the diameter of the island was 710 nm.

  Next, using a 36-gauge ordinary tricot knitting machine, the sea-island type composite drawn yarn is passed through the back heel and front heel in a full set, and an on-machine course with a half structure (back 10-12, front 23-10). The knitting conditions were 110 courses / 2.54 cm.

  In order to remove the sea component of the sea-island type composite drawn yarn, the obtained knitted fabric was subjected to alkali weight reduction at 30 ° C. with a 25 g / liter NAOH aqueous solution at 70 ° C. Thereafter, a conventional dyeing process was performed, and a heat calendering process was performed with a roller calender (manufactured by Yuri Roll Co., Ltd.) at a roller temperature of 160 ° C. and a nip pressure of 60 kgf / cm.

The density of the obtained knitted fabric was 88 course / 56 wale, the total fineness of the multifilament yarn in the knitted fabric was 41 dtex, the single fiber diameter was 710 nm, the number of single yarns 8360, D ^1/2 × Co × We was 31555, and ventilation sex 12cc / ^cm 2 / s (calendering before 43cc / ^cm 2 / s), it was those having excellent lightweight and windproof fabric weight 125 g / ^{m 2} and the fabric par.

[Example 2]
Example 1 was the same as Example 1 except that the knitting structure was changed to a satin structure. In the obtained knitted fabric, the density of the knitted fabric was 87 course / 57 wale, the total fineness of the multifilament yarn in the knitted fabric was 41 dtex, the single fiber diameter was 710 nm, the number of single yarns 8360, D ^1/2 × Co × We but 31,753, had a breathable 1.2cc / ^cm 2 / s (calendering before 8.0cc / ^cm 2 / s), excellent lightweight properties of basis weight 135 g / ^{m 2} and the fabric par and windproof .

[Example 3]
The same sea-island type composite drawn yarn used in Example 1 is fully set on the front rivet, and a normal polyethylene terephthalate multifilament false twist crimped yarn (total fineness 33 dtex / 36 fil) is fully set on the back heel, and half The organization (back 10-12, front 23-10) was knitted on the condition of on-board course 110 course / 2.54 cm.

In the obtained knitted fabric, since the mixing ratio of the sea-island type composite drawn yarn was 65%, the dyeing process and the heating and pressing process were performed in the same manner as in Example 1 except that the weight loss rate was changed to 19.5% by weight. gave. In the obtained knitted fabric, the mixing ratio of nanofibers was 46% by weight, the density of the knitted fabric was 102 course / 76 wales, the total fineness of the multifilament yarn in the knitted fabric was 41 dtex, the single fiber diameter was 710 nm, and the number of single yarns 8360 D ^1/2 × Co × We is 396370, air permeability is 7.3 cc / cm ² / s (15 cc / cm ² / s before calendering), basis weight is 121 g / m ^2, and excellent lightweight and wind-proof properties like fabrics It was what had.

[Example 4]
Using a 36 gauge single circular knitting machine, using the same sea-island type composite drawn yarn used in Example 1 and a normal polyurethane elastic yarn (total fineness 22 dtex / 1 fil), polyurethane elastic yarn 2 A circular knitted fabric with a tengu structure (a sea-island type composite drawn yarn and a polyurethane elastic yarn formed a composite loop) was knitted by simultaneously feeding both yarns to the knitting machine while drafting at a draft rate of 0.0.

In the obtained knitted fabric, since the mixing ratio of the sea-island type composite drawn yarn was 87%, dyeing was performed in the same manner as in Example 1 except that the weight loss rate was changed to 26% by weight. Did not do. In the obtained knitted fabric, the mixing ratio of nanofibers was 61% by weight, the density of the knitted fabric was 100 course / 54 wale, the total fineness of the multifilament yarn in the knitted fabric was 41 dtex, the single fiber diameter was 710 nm, and the number of single yarns 8360 D ^1/2 x Co x We is 34577, breathability is 13 cc / cm ² / s (30 cc / cm ² / s before calendering), and the basis weight is 165 g / m ^2. I had it.

[Comparative Example 1]
Using a 28-gauge ordinary tricot knitting machine, the same sea-island type composite drawn yarn as used in Example 1 was fully set on the back heel and the front heel, and a half structure (back 10-12, front 23-10) ) And knitting conditions of on-machine course 50 course / 2.54 cm.

The obtained knitted fabric was dyed and heated and pressed in the same manner as in Example 1. In the obtained knitted fabric, the density of the knitted fabric is 52 course / 47 wale, the total fineness of the multifilament yarn in the knitted fabric is 41 dtex, the single fiber diameter is 710 nm, the number of single yarns 8360, D ^1/2 × Co × We Of 15649, air permeability of 45 cc / cm ² / s (120 cc / cm ² / s before calendering), basis weight of 68 g / m ^2, and windproof properties were insufficient.

  ADVANTAGE OF THE INVENTION According to this invention, the windproof knitted fabric and textiles which have the lightness and windproof property outstanding as a textile fabric are provided, The industrial value is very large.

1 is a schematic view showing an example of a spinneret used for spinning a sea-island type composite fiber that can be used in the present invention. It is the schematic which shows the other example of the spinneret used in order to spin the sea-island type | mold composite fiber which can be used in this invention.

Explanation of symbols

1: pre-distribution island component polymer reservoir portion 2: island component distribution introduction hole 3: sea component introduction hole 4: pre-distribution sea component polymer reservoir portion 5: individual sea / island = sheath / core structure forming portion 6: entire sea island confluence Part

Claims (11)

A knitted fabric composed of organic fibers and containing 20% by weight or more of multifilament yarns having a single fiber diameter of 1000 nm or less, satisfying the following formula , and the number of single yarns of the multifilament yarns being 500 or more. Windproof knitted fabric.
D ^1/2 × Co × We ≧ 25000
However, D is the total fineness (dtex) of the multifilament yarn, Co is the number of courses per 2.54 cm, and We is the number of wales per 2.54 cm. The windproof knitted fabric according to claim 1, wherein the multifilament yarn is obtained by dissolving and removing a sea component of a sea-island type composite fiber. The windproof knitted fabric according to claim 1 or 2, wherein the multifilament yarn is made of polyester fiber. The windproof knitted fabric according to any one of claims 1 to 3, wherein the knitted fabric has a multilayer structure of two or more layers. The windproof knitted fabric according to claim 4, wherein the knitted fabric is composed only of the multifilament yarn. The knitted fabric includes polyester false twist crimped yarn as other yarn, at least one layer is composed of the multifilament yarn, and at least one layer is composed of the polyester false twist crimped yarn. The windproof knitted fabric according to claim 4. The windproof knitted fabric according to any one of claims 1 to 4, wherein the knitted fabric includes an elastic yarn as another yarn, and the multifilament yarn and the elastic yarn are knitted. The windproof knitted fabric according to any one of claims 1 to 7, wherein the knitted fabric surface is heat-pressed. The basis weight is 150 g / m ² The windproof knitted fabric according to any one of claims 1 to 8, which is as follows. Breathability is 30cc / cm ² The windproof knitted fabric according to any one of claims 1 to 9, which is / s or less. An outer garment, a sports garment, an inner garment, a shoe material, a medical / hygiene product for diapers or a care sheet, a bedding, a chair, using the windproof knitted fabric according to any one of claims 1 to 10. One of the textile products selected from the group consisting of skin materials for sofas, carpets, car seats, and interior goods.

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