JP4556551B2 - High density fabric and manufacturing method - Google Patents

Description

  The present invention relates to a high-density fabric made of polytrimethylene terephthalate ultrafine yarn having excellent windproof properties and a method for producing the same, and more specifically, polylactic acid and polytrimethylene capable of producing polytrimethylene terephthalate ultrafine yarn by dissolution treatment. The present invention relates to a high-density woven fabric having excellent windproof properties obtained by using a sea-island type composite fiber made of methylene terephthalate and a method for producing the same.

  Hitherto, high-density fabrics using polyethylene terephthalate fiber yarns have been widely used as sports fabrics that have windproof and water repellency, but in order to obtain sufficient windproof and water repellency, higher density is required. Therefore, if weaving with a normal yarn made from polyethylene terephthalate and increasing the fabric density at the time of weaving, troubles in weaving are likely to occur, and the resulting fabric has a hard texture due to densification. It was a thing. In order to solve the problem of weaving due to this high density, the raw yarn used for increasing the thermal shrinkage rate can reduce the raw machinery density, but the yarn shrinkage is high, so the fabric after dyeing processing However, there was a problem that the texture was very hard like paper.

  As means for improving the hardness of these textures, a high-density fabric using a fiber yarn made of polytrimethylene terephthalate having a Young's modulus lower than that of polyethylene terephthalate has been proposed (see Patent Document 1 and Patent Document 2). Both are thought to contribute to a certain degree of softness, but are still not at a sufficient level, and the windproof properties (air permeability) are unsatisfactory.

  On the other hand, in order to improve the windproof property and water repellency, it is necessary to reduce the gap generated between the intersection point of the fabric where the warp yarn and the weft yarn intersect and the adjacent intersection point. In order to obtain a woven fabric having a simple structure, it is desirable to increase the number of fiber yarns, and ultrafine fibers are used for the synergistic effect of softening the texture. As a method for obtaining such ultrafine fibers, a method for directly producing thin yarns, and a method for obtaining one type of polymer by eluting or splitting two or more types of polymers having different chemical resistances after composite spinning. However, in the conventional method of eluting the latter polymer, satisfactory windproof and water repellency cannot be obtained due to the influence of the inter-fiber gap formed at the time of elution of the polymer. In the case of producing ultrafine fibers by direct spinning, there is a limit to the single fiber fineness obtained.

  These ultrafine fibers have been conventionally used to improve the hard texture as described above. Particularly, polyester ultrafine fibers having a single fiber fineness of 0.5 dtex or less are used for peach-woven fabrics and the like. However, the ultrafine fiber yarn made of polyethylene terephthalate has a high refractive index of about 1.6, so the color developability when it is made into an ultrafine fiber is not sufficient, and the product development is particularly limited due to inferior dark color developability. In addition, because the Young's modulus of the polymer itself was high, a sufficient soft feeling could not be imparted.

  In addition, many methods for producing ultrafine fibers of polyethylene terephthalate from sea-island type composite fibers or split type composite fibers have been proposed as methods for producing ultrafine fibers made of polyethylene terephthalate. These composite fibers are made of ultra-fine fibers made of polyethylene terephthalate by reducing and leaching one component by alkali treatment at the time of splitting, but polyethylene terephthalate that should be made into ultra-fine fibers at the time of weight-reducing processing Since the weight loss on the side also proceeds at the same time, the strength may be reduced and may not be able to withstand practical use. Conversely, in order to suppress the strength reduction, if the weight reduction processing conditions are relaxed, the division process is completely performed. In some cases, the quality of the product was degraded.

  On the other hand, the above-mentioned fiber made of polytrimethylene terephthalate has an excellent elastic recovery rate, a low Young's modulus, a good dyeability, is chemically stable, and has been known for a long time (Patent Document 3). And Patent Document 4). Furthermore, a method for producing polytrimethylene terephthalate ultrafine fibers from sea-island type composite fibers or split type composite fibers has also been proposed (see Patent Document 5 and Patent Document 6). However, the polymer used as an alkali elution component is a polyester copolymerized with an organic metal salt, the alkali elution time is long, the productivity is poor, and the polymer melting temperature is higher than that of polytrimethylene terephthalate. Since the spinning temperature is high, it is necessary to keep the spinning temperature high. For this reason, the thermal degradation of polytrimethylene terephthalate progresses, the operability is poor, and satisfactory raw yarn strength and texture cannot be obtained.

Furthermore, conventional sea-island type composite fibers or split type composite fibers use copolymerized polyester as an easily-eluting component and are mainly hydrolyzed and removed by alkali treatment, so the waste liquid after hydrolysis Are concerned that it will adversely affect the environment. In order to reduce the environmental impact of this waste liquid, a composite fiber using polylactic acid as an elution component has been proposed (see Patent Document 7), and although it is considered that the environmental impact is certainly reduced, as described above, Satisfactory windproof properties and water repellency cannot be obtained due to the effect of inter-single fiber voids formed between single fibers after elution of polylactic acid.
JP-A-11-200194 Japanese Patent Laid-Open No. 2001-55644 JP 52-5320 A Japanese Patent Laid-Open No. 52-8124 Japanese Patent Laid-Open No. 11-123330 JP 2001-348735 A Japanese Patent Laid-Open No. 11-302926

  Therefore, the object of the present invention was not achieved by the above-described conventional technology, and had excellent productivity, windproof property composed of ultrafine fibers made of polytrimethylene terephthalate, which was excellent in softness and color development when used as a woven fabric for clothing. The present invention provides a high-density fabric excellent in the above.

  Another object of the present invention is to provide a method for producing a high-density fabric excellent in windproof properties, which is composed of ultrafine fibers made of the above polytrimethylene terephthalate.

The object of the present invention can be achieved by employing the following configuration. That is, the high-density fabric of the present invention is a fabric formed by using a multifilament having a single fiber fineness of 0.01 to 0.5 dtex made of polytrimethylene terephthalate for warp and / or weft, And a weft woven fabric having a total coverage of 1700 or more and 3500 or less and an air permeability of less than 1.0 cc / cm ² · s.

And according to the preferable aspect of the high-density fabric of the present invention, the air permeability is less than 0.8 cc / cm ² · s, and the average profile of the multifilament monofilament made of polytrimethylene terephthalate is It is 1.05 or more and 5.0 or less, and it is mentioned that the multifilament which consists of said polytrimethylene terephthalate has a crimp.

  The method for producing a high-density fabric of the present invention is a sea-island composite fiber in which the sea component polymer is composed of polylactic acid and the island component polymer is composed of polytrimethylene terephthalate, A sea-island type composite fiber having a composite ratio of 10/90 to 50/50 and an island component single fiber fineness of 0.01 to 0.5 dtex obtained by dissolution treatment is used for warp and / or weft. Then, after weaving the woven fabric, polylactic acid is eluted by dissolution treatment.

  And according to the preferable aspect of the manufacturing method of the high-density fabric of this invention, 3% or more of the single fiber which consists of polytrimethylene terephthalate which is an island component polymer is eluted after the polylactic acid of the said sea component polymer by a dissolution process. It is mentioned that the solvent used for shrinking and the said dissolution process is an alkali.

ADVANTAGE OF THE INVENTION According to this invention, the high-density fabric excellent in the windproof property using the ultrafine fiber which consists of polytrimethylene terephthalate which was excellent in the soft feeling and coloring property when it was set as the textile for clothing is obtained.

Hereinafter, the best mode for carrying out the high-density fabric of the present invention and the production method thereof will be described in detail.
In the high-density fabric of the present invention, it is necessary to use a multifilament having a single fiber fineness of 0.01 to 0.5 dtex made of polytrimethylene terephthalate for warp and / or weft. The reason for this is to improve the hardness of a high-density fabric composed of conventional multifilaments made of polyethylene terephthalate and the insufficient color development when made into ultrafine fibers, and the single fiber fineness is less than 0.01 dtex. In this case, since the accuracy of each single fiber is lowered, quality problems such as generation of fluff are likely to occur. On the other hand, if the single fiber fineness exceeds 0.5 dtex, the intended soft feeling cannot be obtained. A more preferable single fiber fineness is 0.05 to 0.2 dtex.

  The multifilament having a single fiber fineness of 0.01 to 0.5 dtex used in the present invention is preferably employed in a range of 33 to 168 dtex in terms of the total fineness.

The high-density fabric of the present invention is constituted by using a multifilament made of 0.01 to 0.5 dtex of polytrimethylene terephthalate for warp and / or weft, but is made of polyethylene terephthalate as another fiber. There may be no problem even if synthetic fibers such as fibers or natural fibers are partially included, and the fibers made of polyethylene terephthalate may have a so-called irregular cross section such as a triangle or a flat shape. Here, in order to obtain a high-density fabric excellent in windproof property of the present invention, the polytrimethylene terephthalate is preferably used in a weight ratio of preferably 30% or more, more preferably 40% or more, As the woven structure, a flat structure (1/1 flat, piece mat, etc.) having a large binding force at the crossing point is desirable.
Next, in the present invention, in order to obtain a high-density fabric excellent in windproof property, which is the object of the present invention, the total coverage of the warp yarn and the weft yarn constituting the high-density fabric is 1700 or more and 3500 or less, and high It is necessary that the air permeability of the density fabric is less than 1.0 cc / cm ² · s.

  The total coverage of warp and weft is a factor that represents the fineness of the warp and weft that make up the fabric. If the total coverage is less than 1700, windproof and water repellency will not be sufficient. A woven fabric having a total coverage exceeding 3500 is not preferable because it is a region that cannot be stably obtained in industrial production. A more preferable range of the total coverage is 2000 or more and 3000 or less. The total coverage mentioned here is calculated by the following equation.

Total cover rate = warp yarn cover rate + width yarn cover rate Warp yarn cover rate = warp yarn density (lines / inch) × (warp yarn fineness (dtex)) ^1/2
Cover rate of weft yarn = weft yarn density (lines / inch) × (weft yarn fineness (dtex)) ^1/2
The air permeability is a measured value representing the windproof and water repellency performances of the present invention, and the air permeability of the high-density fabric of the present invention is less than 1.0 cc / cm ² · s, more preferably Is less than 0.8 cc / cm ² · s. Such air permeability is necessary to exhibit functionality when a high-density fabric is used as clothing. This air permeability can be reduced relatively easily by applying a high-temperature and high-pressure press commonly called “calendar” processing when producing the fabric, but the texture of the high-density fabric obtained in the present invention becomes paper-like. Therefore, the adoption is not preferable, and even if it is adopted, it is desirable to keep the processing under light conditions. In addition to the calendering, a method of thinly coating the surface of the fabric with a polyurethane resin can also be employed as a means for reducing the air permeability.

  The air permeability here represents windproof and water repellent performance, but secondary performance is that the high-density fabric is dense, so the fabric itself or light water repellent finish can be applied. Since it is difficult for powder and particles such as pollen to adhere and easily fall off, it can also be used for allergy prevention clothing such as hay fever.

  Here, the filament made of polytrimethylene terephthalate constituting the high-density fabric in the present invention preferably has a deformed cross section having an average deformity of the single fiber of 1.05 or more and 3.0 or less. This is because irregularly shaped fibers have a bending moment characteristic because of the bending moment characteristics, and as an extreme example, flat-shaped fibers tend to bend in the short axis direction of the cross section, but the long axis of the cross section. Hard to bend in the direction. This characteristic affects the opening state of the multifilament when it is made into a woven fabric, and the fibers with irregular cross-section tend to have better opening performance than the uniform round-section fibers, and between the constituent single fibers. It is even better if there is variation in the degree of irregularity. This high fiber-opening property has the effect of reducing the gap that occurs between the crossing point of the fabric where the warp yarn and the horizontal yarn intersect and the adjacent crossing point, which are necessary to improve windproof and water repellency. is there. The average irregularity of the cross section for obtaining this effect is 1.05 or more and 5.0 or less, and when the average irregularity is less than 1.05, it is difficult to obtain the desired effect of improving the opening property, On the other hand, if the average irregularity exceeds 5.0, the yarn becomes very flat and the direction in which it is easy to bend becomes constant, and the single fibers are lined up in the same direction on the fabric. Tend to be.

  Such a modified cross-section fiber can have a cross-section by setting the spinneret, changing the island component polymer arrangement of the sea-island type composite fiber, the number of island components, the composite ratio of the sea component polymer and the island component polymer, etc. It can be obtained as an irregularly shaped fiber.

  Moreover, it is also a preferable aspect that the multifilament made of polytrimethylene terephthalate used in the high-density fabric of the present invention has crimps. This is due to the fact that the multifilament has crimps, and when it is made into a woven fabric, the effect of reducing the gap formed between the woven fabric intersection where the warp yarn and the weft yarn intersect and the adjacent intersection point is improved, and wind resistance This is because the water repellency is improved. As a method for imparting crimps to the multifilament, a general false twisting method or the like can be employed.

  Next, the manufacturing method of the high-density fabric of this invention is demonstrated. The high-density fabric of the present invention is composed of ultrafine fibers made of polytrimethylene terephthalate, and these ultrafine fibers are preferably obtained from so-called sea-island type composite fibers. Specifically, after weaving a fabric using a sea-island type composite fiber using a polylactic acid polymer for the sea component and a polytrimethylene terephthalate polymer for the island component, the sea component is used in the dyeing process or a process accompanying it. The polylactic acid is dissolved and removed to obtain ultrafine fibers of polytrimethylene terephthalate. The ultrafine fiber obtained here is obtained as a multifilament because it has a cross-sectional structure in which a plurality of island components are scattered in the sea component.

  In the sea-island type composite fiber used in the present invention, it is important to arrange polylactic acid as a sea component. Polylactic acid has a lower melting temperature than polytrimethylene terephthalate or polyethylene terephthalate, so the spinning temperature is higher than when polyethylene terephthalate copolymerized with an organic metal salt whose melting temperature is higher than that of polytrimethylene terephthalate is used as the sea component. Can be kept low, and it is possible to stabilize the operation in the process from the raw yarn production stage to the high-order processing stage, and to prevent a decrease in texture due to thermal deterioration of the polytrimethylene terephthalate which is an island component.

  Polylactic acid generally has a higher alkali elution rate than a polyester copolymerized with an organic metal salt. However, polylactic acid can be used as a sea-island composite fiber with polylactic acid as a sea component and polytrimethylene terephthalate as an island component. The orientation of polylactic acid is suppressed, and the alkali elution rate of polylactic acid becomes faster.

  Furthermore, the sea-island type composite fiber combining polylactic acid and polytrimethylene terephthalate in this way is an ultrafine fiber composed of polytrimethylene terephthalate divided as island components after removing the polylactic acid of the sea component by alkali treatment etc. Therefore, it is possible to impart a unique phenomenon of leaving shrinkage, and therefore, after forming the ultrafine fiber, the woven density of the fabric can be increased and further densified.

  This point will be further described. Conventional polyester sea-island type composite fibers generally use polyethylene terephthalate copolymerized with an organic metal salt having a high alkali hydrolysis rate as a sea component, and ordinary polyethylene terephthalate as an island component. The sea component is eluted after the sea-island type composite fiber is knitted into a knitted fabric. In the polyethylene terephthalate sea-island composite fiber copolymerized with this organometallic salt, the sea component and the island component have substantially the same heat setting property, and therefore the sea-island component exhibits uniform shrinkage after spinning / drawing. In addition, in order to surely elute polyethylene terephthalate copolymerized with an organometallic salt after knitting fabric formation, alkaline treatment alone tends to cause poor elution, and the alkali hydrolysis rate between sea and island components is compared. In order to selectively decompose only the sea component because it is close to the target, the process of eluting the sea component by alkali treatment after treating the knitted fabric with a high-temperature acid in advance and cracking the interface between the sea component and the sheath component Often take. For this reason, the island component after eluting the sea component has already hardly contracted.

  On the other hand, in the case of a sea-island type composite fiber using a polylactic acid polymer for the sea component and a polytrimethylene terephthalate polymer for the island component as in the present invention, first, the difference in heat setting properties between polylactic acid and polytrimethylene terephthalate Is noted. Polylactic acid is heat-set at a relatively low temperature, whereas polytrimethylene terephthalate is not heat-set unless the temperature is higher than that of polylactic acid, and shrinkage remains at a temperature at which polylactic acid can be heat-set. Become. In addition, compared with polyethylene terephthalate copolymerized with organic metal salts of the prior art, polylactic acid is faster in alkali hydrolysis, and the island component polytrimethylene terephthalate has higher alkali hydrolysis than ordinary polyethylene terephthalate. slow. Therefore, when the sea component is eluted as in the prior art described above, the sea component can be stably eluted only by a relatively low temperature alkali treatment without performing a high temperature acid treatment in advance. Even after elution of some polylactic acid, the island component polytrimethylene terephthalate still has shrinkage performance, and after elution of the sea component, the density of the dough can be further densified.

  Specifically, the rate of shrinkage of ultrafine fibers made of polytrimethylene terephthalate after elution of polylactic acid, which is a sea component, depends on so-called textile design such as woven structure and woven density. Densification of the fabric can be achieved by shrinking 3% or more.

  Due to the combined effect of these polylactic acid and polytrimethylene terephthalate, it is excellent in productivity, which is the object of the present invention, and from the fine fibers of polytrimethylene terephthalate, which is excellent in softness and color development when used as a woven fabric for clothing. It is possible to provide a high-density fabric excellent in windproof properties.

  The polylactic acid referred to in the present invention is not particularly limited, but preferably has an average molecular weight of 50,000 to 100,000 and is composed of L-lactic acid having a purity of 95.0% to 99.5%. If it is, the intensity | strength in each manufacturing process can be maintained, and since the moderate biodegradability is obtained, the environmental load of the waste liquid after elution is small. Further, the polylactic acid may be a copolymerized polylactic acid obtained by copolymerizing other components having ester forming ability in addition to L-lactic acid and D-lactic acid.

  Particularly preferable polylactic acid includes polylactic acid, which is a polyester mainly composed of L-lactic acid, and polyglycolic acid, which is a polyester mainly composed of glycolic acid, from the viewpoint of a high melting point and a low refractive index. . “L-lactic acid as a main component” means that 60% by weight or more of the constituent components is made of L-lactic acid, and is a polyester containing D-lactic acid within a range not exceeding 40% by weight. Also good.

  Other components copolymerizable with polylactic acid include glycolic acid, 3-hydroxybutyric acid, 4-hydroxybutyric acid, 4-hydroxyvaleric acid, 6-hydroxycaproic acid and other hydroxycarboxylic acids, ethylene glycol, propylene glycol , Butanediol, neopentyl glycol, polyethylene glycol, glycerin, pentaerythritol and other compounds containing a plurality of hydroxyl groups in the molecule or derivatives thereof, adipic acid, sebacic acid, fumaric acid, terephthalic acid, isophthalic acid, 2, Examples thereof include compounds containing a plurality of carboxylic acid groups in the molecule, such as 6-naphthalenedicarboxylic acid, 5-sodium sulfoisophthalic acid and 5-tetrabutylphosphonium isophthalic acid, or derivatives thereof.

  The average molecular weight of polylactic acid is preferably as high as not exceeding 300,000, the more preferable average molecular weight is 50,000 or more, and the more preferable average molecular weight is 100,000 or more.

  By setting the average molecular weight to 50,000 or more, fiber strength physical properties at a level that can be practically used can be obtained, and by increasing the average molecular weight to 300,000 or less, the increase in the viscosity of the polymer can be suppressed. The temperature can also be kept low, so that thermal decomposition of the polymer can be prevented and stable spinning can be performed.

  In order to reduce the melt viscosity, aliphatic polyester polymers such as polycaprolactone, polybutylene succinate, and polyethylene succinate can be used as an internal plasticizer or as an external plasticizer. Furthermore, inorganic fine particles and organic compounds can be added as necessary as matting agents, deodorants, flame retardants, yarn friction reducing agents, antioxidants and coloring pigments.

Polytrimethylene terephthalate used as an island component 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% or less, preferably 10 mol% or less.
Examples of the copolymerizable compound include dicarboxylic acids such as isophthalic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, and sebacic acid, while the glycol component includes, for example, ethylene glycol, diethylene glycol, Examples thereof include butanediol, neopentyl glycol, cyclohexanedimethanol, polyethylene glycol, and polypropylene glycol, but are not limited thereto.

Further, titanium dioxide as a matting agent, silica or alumina fine particles as a lubricant, hindered phenol derivatives as an antioxidant, and coloring pigments can be added as necessary.
In addition, the sea / island component ratio of the sea-island composite fiber used in the present invention is preferably 10/90 to 50/50 from the viewpoint of stability of the composite form, yarn-forming property and productivity. It is. When the composite ratio of the sea component is less than 10%, a composite abnormality occurs, resulting in poor splitting, or even if the composite form is normal, poor splitting due to poor dissolution of the sea component results in sufficient softness. There are things you can't get. On the contrary, when the composite ratio of the sea component exceeds 50%, productivity is lowered, which is not preferable. The more preferable composite ratio of the sea component / island component of the sea-island type composite fiber is 15/85 to 40/60.

  Moreover, in the sea-island type composite fiber used by this invention, it is preferable that the single fiber fineness of the island component after removing a sea component is 0.01-0.5 dtex. This is to improve the hardness of the conventional high-density fabric composed of polyethylene terephthalate and the insufficient color developability when made into ultrafine fibers. If the single fiber fineness is less than 0.01 dtex, the single fiber 1 Since the accuracy of one book is lowered, quality problems are likely to occur. On the other hand, if the single fiber fineness is larger than 0.5 dtex, the desired soft feeling cannot be obtained, which is not desirable. A more preferable single fiber fineness is 0.05 to 0.2 dtex.

  The sea component removal treatment can be preferably carried out in an alkaline solution of 10 to 100 g / l, more preferably 20 to 80 g / l. What is necessary is just to process at the temperature of 60-120 degreeC normally using a sodium hydroxide solution as an alkaline solution.

  The cross-sectional shape of the sea-island type composite fiber used in the present invention may be an irregular cross-section such as flat, hollow, and triangular in addition to a round cross-section. Moreover, the island component may be completely covered with the sea component on the fiber surface of the sea-island type composite fiber, or the island component may be partially exposed. Furthermore, the cross-sectional shape of the island component after removing the sea component may be a deformed cross section such as a flat shape or a triangular shape in addition to the round cross section.

  In addition, the sea-island type composite fiber used in the present invention is, for example, an apparatus shown in FIG. 3 described in Japanese Patent Laid-Open No. 57-47938 or FIG. 2 described in Japanese Patent Laid-Open No. 57-82526. It can be used as a suitable example, and the polymer as the sea component and the polymer as the island component are filtered through separate polymer introduction pipes in the respective filtration chambers, and then into the mouthpiece pores via the mouthpiece inflow holes. It can be obtained by using a composite spinneret that can associate (join) in a split flow state.

  In producing the sea-island type composite fiber used in the present invention, any method such as a method in which spinning and drawing processes are continuously performed, a method in which the yarn is once wound as an undrawn yarn and then drawn, or a high-speed yarn making method is applied. can do. Furthermore, the sea-island type composite fiber used in the present invention may be subjected to yarn processing such as false twisting or air entanglement as necessary.

  The high-density fabric of the present invention is suitably used for sportswear and casual wear that make use of windproof and water repellency, and for outer fabrics such as down jackets and batting jackets that make use of high density.

Hereinafter, the present invention will be described in more detail with reference to examples. In addition, each characteristic value in an Example was calculated | required with the following method.
A. Intrinsic viscosity [η]
A sample of 0.10 g was dissolved in 10 ml of orthochlorophenol and measured using an Ostwald viscometer at a temperature of 25 ° C.
B. Air permeability Measured according to JIS L1096 (Method A).
C. Average degree of irregularity Create a section of the fiber cross section, observe it with a photograph, measure the diameter n of the maximum inscribed circle of the cross section and the maximum width m of the cross section, and calculate the degree of irregularity of each single fiber by the following formula The average degree of deformity was determined.
Deformity = m / n × 100 (%)
Example 1
Tetrabutyl titanate was used as a catalyst in 19.4 kg of dimethyl terephthalic acid and 15.2 kg of 1,3-propanediol, and the ester exchange reaction was carried out while distilling methanol at a temperature of 140 ° C to 230 ° C. Polymerization was conducted for 3.5 hours under the condition of a constant temperature of 1.5 to obtain polytrimethylene terephthalate having an intrinsic viscosity [η] of 0.96. Using the polytrimethylene terephthalate obtained by the above manufacturing method as an island component, using poly-L-lactic acid having an optical purity of 98.0% as a sea component, the island component at a composite ratio of sea / island = 20/80 An undrawn yarn was obtained by winding a sea island type compound base having a number of 8 and a number of holes of 36 with a compound spinning machine at a spinning temperature of 250 ° C. and a take-up speed of 1500 m / min. Subsequently, the unstretched yarn is stretched at a stretching temperature of 80 ° C. using a normal hot roll-hot roll stretching machine, and the stretching ratio is adjusted so that the stretched yarn has an elongation of 35% at a heat setting temperature of 120 ° C. In addition, stretching was performed to obtain a stretched yarn of 66 dtex-36 filament. The obtained drawn yarn had a strength of 3.7 cN / dtex and a boiling water shrinkage of 10.0%. Using the obtained drawn yarn for warp and weft, weave a plain fabric with warp density of 145 (lines / inch) and weft density of 95 (lines / inch), and then sodium hydroxide 30 (g / l) It processed for 60 minutes in the 80 degreeC warm water of a density | concentration, the sea component polylactic acid was eluted, and the textile fabric which consists of an ultrafine fiber (multifilament) was obtained. At this stage, the obtained fabric sample was cut and the cross section of the fabric was observed with a scanning electron microscope (SEM) to confirm that the sea component was completely eluted. Subsequently, after presetting at a temperature of 150 ° C., using a flow dyeing machine, Dianix Navy Blue BE-SF was used at a concentration of 2% owf, dyed / reduced and washed at a temperature of 120 ° C., and finished at a temperature of 140 ° C. I set it. The obtained woven fabric is a high-density woven fabric having a warp yarn density of 170 (lines / inch) and a weft yarn density of 108 (lines / inch), and has an air permeability of 0.5 cc / cm ² · s and a high windproof property and is soft. It had a good touch and excellent color developability. At this time, the cover rate of the warp yarn was 1235, the cover rate of the weft yarn was 785, and the total cover rate was 2020.

  When the multifilament was disassembled from this high-density fabric, a section of the fiber cross-section was collected by the embedding method, and a cross-sectional photograph was taken to calculate the average irregularity, which was 1.26. The surface photograph of the obtained high-density fabric is shown in FIG.

(Comparative Example 1)
Using polyethylene terephthalate with intrinsic viscosity [η] of 0.56 copolymerized with 4.5 mol% of 5-sodiumsulfoisophthalic acid as sea component, and using polyethylene terephthalate without copolymerizing third component as island component Using the same base and composite spinning machine as in Example 1, the yarn was wound at a spinning temperature of 280 ° C. and a take-up speed of 1500 m / min, and the resulting undrawn yarn was drawn in the same manner as in Example 1 to obtain a drawn yarn. The obtained drawn yarn was 66 dtex-36 filament, the strength was 2.5 cN / dtex, and the boiling water shrinkage was 8.0%. Using the obtained drawn yarn for warp and weft, weaving a plain woven fabric having a warp density of 145 (lines / inch) and a weft density of 95 (lines / inch), and a sodium hydroxide concentration of 30 (g / l) The elution of the sea component copolyester was conducted for 60 minutes in 80 ° C. warm water, and a sample of the fabric after alkali treatment was cut and the cross section of the fabric was observed with a scanning electron microscope (SEM). It was not completely eluted, and it was confirmed that the resolution was poor. For this reason, the obtained raw machine was first acid-treated for 30 minutes under hot water conditions of acetic acid 1 (g / l) concentration at 130 ° C., neutralized / washed, and again at 80 ° C. of sodium hydroxide 30 (g / l) concentration. Attempt to elute copolyester of sea component by treating in warm water for 60 minutes, cut sample of fabric after alkali treatment and observe cross section of fabric with scanning electron microscope (SEM), sea component completely eluted I confirmed that Next, after presetting at a temperature of 150 ° C, using a flow dyeing machine, Dianix Navy Blue BE-SF at a 2% owf concentration, dyeing / reducing washing at a temperature of 130 ° C, and finishing setting at a temperature of 140 ° C did. The resulting fabric is a fabric with a warp density of 153 (lines / inch) and a weft density of 100 (lines / inch). The air permeability is 6.7 cc / cm ² · s and the windproof property is not high. Although it was a soft hand, the color was poor. At this time, the cover rate of the warp yarn was 1112, the cover rate of the weft yarn was 727, and the total cover rate was 1839. A photograph of the surface of the resulting fabric is shown in FIG.

(Example 2)
The same sea-island type composite fiber as that used in Example 1 is used for the weft yarn, and the warp yarn is a 56 dtex-144 filament polyethylene terephthalate false twisted yarn. The warp yarn density is 199 (lines / inch), and the weft yarn density is Weaving 111 (lines / inch) plain fabric and then treating it in 80 ° C warm water with a concentration of sodium hydroxide of 30 (g / l) for 60 minutes to elute the polylactic acid, the sea component of the weft yarn, Filament) was obtained. Subsequently, after presetting at a temperature of 150 ° C., dyeing / reduction washing was performed at a temperature of 130 ° C. using a liquid dyeing machine, and a temperature finishing set at 160 ° C. was performed. The obtained woven fabric is a high-density woven fabric having a warp yarn density of 238 (lines / inch) and a weft yarn density of 129 (lines / inch), and its air permeability is 0.8 cc / cm ² · s, which is windproof. It was expensive. At this time, the cover rate of the warp yarn was 1781, the cover rate of the weft yarn was 937, and the total cover rate was 2718.

  The high-density fabric using the fiber yarn made of polyethylene terephthalate according to the present invention can achieve higher density than ever, and can be used widely for sports fabric having windproof and water repellency.

FIG. 1 is a surface photograph of a high-density fabric obtained in Example 1 of the present invention. FIG. 2 is a photograph of the surface of the fabric obtained in Comparative Example 1.

Claims (4)

A fabric warp and / or a single fiber fineness of poly trimethylene terephthalate weft is using multifilament 0.01～0.5Dtex, monofilament multifilament made of the polytrimethylene terephthalate However, the average irregularity is 1.05 or more and 5.0 or less, the cross-sectional shape is flat or triangular, the total coverage of the warp yarn and the weft yarn is 1700 or more and 3500 or less, and the air permeability is 0.8 cc / cm ^2. A high density fabric characterized by being less than s. The high-density fabric according to claim 1 , wherein the multifilament made of polytrimethylene terephthalate has crimps. The sea component polymer is composed of polylactic acid and the island component polymer is composed of polytrimethylene terephthalate, and the sea component / island component composite ratio is 10/90 to 50/50, Weaving the woven fabric using sea-island type composite fiber with a single fiber fineness of 0.01-0.5 dtex of island component obtained by dissolution treatment for warp and / or weft yarn, and then eluting polylactic acid by dissolution treatment after manufacturing method of high-density woven fabric characterized by Rukoto is a monofilament made of polytrimethylene terephthalate is an island component polymer at least 3% shrinkage. The method for producing a high-density fabric according to claim 3 , wherein the solvent used for the dissolution treatment is an alkali.