CN1585841B - Flat multifilament-yarn textile and textile material - Google Patents

Abstract

A flat multifilament yarn woven fabric having a low air permeability and excellent vision through-preventing property and water- or perspiration-absorbing property includes, as warp and/or weft yarns, multifilament yarns formed from a plurality of artificial individual filaments having a flat cross-sectional profile in which, on both the sides of a longitudinal center line of the profile, 3 or more projections projecting outward from the longitudinal center line and 2 or more constrictions formed between the projections, per side of the profile are formed approximately in symmetry with respect to the longitudinal center line, and a degree of flatness of the profile represented by a ratio (B/C1) of a largest length B of the profile in the direction of the longitudinal center line to a largest width C1 of the profile in the direction of right angles to the longitudinal center line is 2 to 6, the woven fabric having a cover factor of 800 to 3500.

Description

Flat multifilament yarn woven fabrics and textile materials

technical field

This invention relates to flat multifilament yarn woven fabrics. In particular, the present invention relates to woven fabrics comprising multifilament yarns composed of a plurality of rayon monofilaments having a flat cross-sectional profile having two or more constrictions on each side portion and exhibiting a soft Feel, in fact high water absorption, abrasion resistance and see-through resistance. the

Background technique

Currently, sports apparel and uniforms utilize different types of woven fabrics that are not sufficiently breathable. As low-air-permeability woven fabrics, known are high-density woven fabrics formed of synthetic fibers, such as polyester or polyamide fibers, and coated woven fabrics in which resin coatings are formed on woven fabrics, and calendered woven fabrics. fabric. the

However, high-density woven fabrics, surface-coated and calendered woven fabrics generally have low softness (hard hand), and the surface of the fabric exhibits low resistance to abrasion (abrasion resistance), so these types of woven fabrics must be Improve. the

Synthetic fibers such as polyester and polyamide fibers have excellent physical and chemical properties and actually have different uses such as clothing and industrial uses. In fact, polyester fibers exhibit excellent mechanical strength, dimensional stability and non-ironing properties, so that different types of woven fabrics formed from synthetic fibers such as polyester fibers can be widely used. the

However, in addition to having the above advantages, woven fabrics formed of synthetic fibers such as polyester fibers have high transparency. Thus, when high-transparency synthetic fibers are formed into a fabric, and the fabric is used as an upper garment, it can be found that there is a problem of wear of the garment under the upper garment, that is, underwear. the

As a method for solving the above-mentioned problems, it is known that inorganic fine particles such as titanium dioxide particles are distributed in synthetic fibers. This method results in the resulting synthetic fibers exhibiting increased opacity, which enhances see-through properties. However, woven fabrics formed from opaque synthetic fibers must still have an increased weave density to prevent light from passing through the gaps formed between the yarns from which the woven fabric is formed. An increase in weaving density brings about the problem that the resulting woven fabric exhibits a decrease in softness. the

In the case of woven fabrics used as interior materials such as curtains, the see-through performance (i.e., the performance of preventing vision from seeing through a product and people's movement in the room) and light penetration must be high. Usually, however, these properties are inconsistent with each other, and thus, it is difficult to realize them together. the

For this reason, usually, thin lace curtains are arranged on the window side, and thick drape curtains are arranged on the indoor side. At night, the drape curtains are drawn, and during the day, the lace curtains are drawn to meet the requirements of anti-perspective and light transmission. However, in general, thick hanging curtains have excellent anti-see-through performance and poor light-transmitting performance, and thin lace curtains have insufficient see-through performance not only during the day but also at night. Therefore, it is necessary to solve this problem. To solve this problem, for example, Japanese Patent No. 3167586 discloses a light-blocking curtain formed of a composite woven fabric comprising polyester fiber yarns containing a delustering agent such as titanium dioxide, and black pigments. A black polyester fiber yarn capable of reflecting and absorbing light; for example, a mirror curtain is disclosed in Japanese Unexamined Patent Publication 2000-237036, which is formed of a woven fabric or a knitted fabric, and on one side surface thereof Or both sides surfaces are provided with woven fabric flat luster yarn, the curtain has high performance of preventing the room from being seen from the outside through the curtain, this is because light is scattered when it is irradiated on the plain glossy surface of the woven fabric, the curtain also has satisfactory light transmission and air permeability; and, for example, a light-blocking woven fabric is disclosed in Japanese Unexamined Patent Publication No. 62-133787 in which a black light-shielding layer is formed on one surface of the woven fabric. the

The above-mentioned light-blocking woven fabric and light-blocking curtain having a black light-shielding layer formed on the surface of the woven fabric have a problem in that light transmission is poor, and the interior of the curtained room is dark, thereby creating a dull environment in the curtained room. Moreover, the light transmittance of the mirror reflection curtain is high. However, a problem with specular curtains is that the anti-see-through property of the specular curtain is not sufficient especially when possible, and the flat luster yarn produces a vivid sheen on the specular curtain. the

As described above, there is no woven fabric that has sufficient light transmission and excellent see-through resistance and can be used in practice. the

Furthermore, woven fabrics made of synthetic fibers are disadvantageous because their water absorption, especially sweat absorption, is inferior to that of woven fabrics made of natural fibers such as cotton fibers. the

As a means of enhancing the water absorption and sweat absorption of synthetic fiber woven fabrics, a water absorption enhancing method using a water absorbing agent for woven fabrics is known. Moreover, for example, when using shirts, sportswear and uniforms, further improvement of water and sweat absorption performance is required,

Under the above circumstances, there is an urgent need for man-made fiber woven fabrics, especially synthetic fiber woven fabrics with soft touch, high see-through resistance and excellent water and sweat absorption. the

Contents of the invention

An object of the present invention is to provide a flat multifilament yarn woven fabric which exhibits high soft hand, high water and sweat absorption, abrasion resistance, moderate air permeability, light transmission and high see-through resistance. the

Another object of the present invention is to provide a flat multifilament yarn woven fabric which is suitable for constituting a textile material with appropriate air permeability, a textile material with high see-through resistance, high water and sweat absorption properties and/or Especially useful for textile materials, and/or textile materials with high abrasion resistance. the

The above objects can be achieved by weaving fabrics from the flat multifilament yarns of the present invention. the

The flat multifilament yarn woven fabric for clothing materials or interior materials of the present invention includes a plurality of multifilament yarns including a plurality of rayon monofilaments whose main component includes a polyester polymer , and has a flat cross-sectional shape;

On both sides of the longitudinal centerline of the flattened cross-sectional profile of each artificial monofilament, 4-6 protrusions protrude outward from the longitudinal centerline on each side portion, and 3 protrusions are formed between the protrusions on each side portion - 5 constrictions shaped almost symmetrically with respect to the longitudinal centerline, and having a flatness of 2 to 6 in the cross-sectional profile, which is determined by the maximum length (B) of the cross-sectional profile in the direction of the longitudinal centerline and in relation to the longitudinal center The ratio (B/C1) of the maximum width (C1) of the cross-sectional profile in the direction at right angles to the line is expressed, and the woven fabric has a cover factor of 800 to 3500, characterized in that the total thickness of each multifilament yarn 30 to 170dtex. the

In the flat multifilament yarn woven fabric of the present invention, the fiber-forming polymer is preferably selected from polyvinylidene chloride, polypropylene, regenerated cellulose, and cellulose acetate. the

In the flat multifilament yarn woven fabric of the present invention, in the cross-sectional profile of the rayon monofilament, the ratio (C1/C2) of the maximum width (C1) to the minimum width (C2) is preferably in the range of 1.05 to 4.00 Inside. the

In the flat multifilament yarn woven fabric of the present invention, the total thickness of the multifilament yarns is preferably in the range of about 30 to 170 dtex, and the thickness of the monofilaments is preferably in the range of about 0.5 to 5 dtex. the

The flat multifilament yarn woven fabric of the present invention preferably has a fabric structure selected from plain weave, twill weave, and satin weave structures. the

In the flat multifilament yarn woven fabric of the present invention, the multifilament yarn including rayon monofilaments having a flat cross-sectional shape preferably has a mass content of 10 to 100% by mass based on the mass of the woven fabric. the

In one embodiment (1) of the flat multifilament yarn woven fabric of the present invention, the woven fabric has a cover factor in the range of about 1500 to 3500. the

In one embodiment (1) of the flat multifilament yarn woven fabric of the present invention, the multifilament yarn preferably has a twist (or twist) number of about 0 to 2500 turns/meter. the

In the embodiment (1) of the present invention, the flat multifilament yarn woven fabric preferably has an air permeability of 5 ml/cm ² ·sec (milliliter/cm ² ·second) or less according to JIS _L1096-1998 , 6.27 .1, method A (using Frazir type testing machine) to determine.

In one embodiment (1) of the flat multifilament yarn woven fabric of the present invention, the air permeability is preferably in the range of about 0.1 to 4.0 ml/cm ² ·sec.

In the embodiment (1) of the present invention, the flat multifilament yarn woven fabric preferably has a water absorption speed of 40 mm (millimeter) or more according to JIS L _1096-1998 , 6.26.1, (2) method B ( Byreck method) determined.

In the embodiment (1) of the present invention, the flat multifilament yarn woven fabric preferably has an abrasion resistance of 50 abrasiveness according to JIS L _1096-1998 , 6.171., (1) method A-1 (flat surface method) is determined.

A low-air-permeability textile material of the present invention includes the flat multifilament yarn woven fabric of Example (1) of the present invention. the

In one embodiment (2) of the flat multifilament yarn woven fabric of the present invention, the rayon of the multifilament yarn comprises a delustering agent with a mass content of 0.2%, and the cover factor of the woven fabric is in the range of about 1300 to 3000 range. the

In one embodiment (2) of the flat multifilament yarn woven fabric of the present invention, the multifilament yarn preferably has a twist number of about 0 to 1500 turns/m. the

In the embodiment (2) of the present invention, the flat multifilament yarn woven fabric preferably has a certain anti-see-through degree of the woven fabric, and in the L*a*b* color system, the anti-see-through degree of the woven fabric is worse than The value ΔL (=L* _W -L* _b ) indicates that the difference ΔL is 15 or less, the difference ΔL being the difference between the L* value of the woven fabric in L* _W and the value in L* _b Indicates the difference in L* values of the woven fabrics placed on the blackboard.

In the embodiment (2) of the present invention, the flat multifilament yarn woven fabric preferably has a water absorption speed of 40 mm or more according to JIS L _1096-1998 , 6.26.1, (2) method B (Byreck method) Sure.

A kind of anti-see-through, sweat-absorbing textile material of the present invention comprises the flat multifilament yarn woven fabric of embodiment (2) of the present invention. the

In one embodiment (3) of the flat multifilament yarn woven fabric of the present invention, the rayon of the multifilament yarn contains a delustering agent in a mass content of 0 to 0.2%, and the cover factor of the woven fabric is in the range of In the range of about 800 to 2000. the

In one embodiment (3) of the flat multifilament yarn woven fabric of the present invention, the multifilament yarn preferably has a twist number of 0 to 1000 turns/m. the

In the embodiment (3) of the present invention, the flat multifilament yarn woven fabric preferably has a light transmittance 7 of 10 to 70% determined according to JIS L _1055-1987 , 6.1, method A, with an illuminance of 100000 Lx.

A see-through, sweat-absorbing textile material of the present invention includes the flat multifilament yarn woven fabric of the embodiment (3) of the present invention. the

Description of drawings

Figure 1 is an illustrative cross-sectional profile of an example of a flat multifilament that can be used in the flat multifilament yarn woven fabric of the present invention;

Figure 2 is an illustrative cross-sectional profile of another example of a flat multifilament that can be used in the flat multifilament yarn woven fabric of the present invention; and

Fig. 3 is an illustrative cross-sectional profile of still another example of flat multifilaments usable in the flat multifilament yarn woven fabric of the present invention. the

Detailed ways

The inventors of the present invention have discovered that in woven fabrics comprising multifilament yarns as warps and/or wefts, the multifilament yarns each comprise a plurality of monofilaments comprising a rayon-forming polymeric material and having a flattened cross-section Shape, the cross-sectional shape of each monofilament has: relative to the longitudinal center line of the flat shape, at each side part of the flat shape, a protrusion protruding outward from the longitudinal center line of the flat shape, the number of which is 3 One or more, preferably 4 or more, preferably 4 to 6; and the constriction formed between the protrusions at each side portion of the flat shape relative to the longitudinal centerline of the flat shape, the The number of constrictions is 2 or more, preferably 3 or more, most preferably 3 to 5, and the projections and constrictions are respectively almost symmetrically shaped with respect to the longitudinal centerline of the flat shape, in this case , the flatness of the cross-sectional profile of the monofilament is controlled in the range of 2 to 6, which is determined by the maximum length (B) of the flat profile in the longitudinal direction and the maximum width (C1) in the transverse direction perpendicular to the longitudinal direction of the flat profile Ratio (B/C1) representation. (1) The flat monofilaments in the flat multifilament yarns of the formed woven fabric are in close contact with each other at their flat peripheries, and at the intersecting parts of the warp and weft threads of the woven fabric, the closely contacting flat monofilaments are easily distorted by the intersecting warp and weft threads. The compressive force of the weft threads slides and spreads out against each other so as to form a loose, dense cross section in the woven fabric, where the gaps between the flat monofilaments are reduced, (2) the flat peripheries of the flat monofilaments in close contact with each other have multiple protrusions portion and a plurality of constricted portions, which are rougher, and therefore, the frictional resistance between the flat monofilaments is reduced, so that the warp-weft intersecting portions of the formed flat multifilament yarn woven fabric exhibit high softness (flexibility) and Low breathability. the

Furthermore, the inventors of the present invention found that the plurality of constrictions formed on the periphery of the flat monofilaments cause capillarity of the generated liquid, and thus, the woven fabric of the present invention exhibits excellent water and sweat absorption properties. the

Also, the inventors of the present invention found that the plurality of protrusions and constrictions formed on the periphery of the flat monofilaments resulted in frictional resistance of the periphery of the flat monofilaments and that the formed woven fabric of the present invention exhibited excellent abrasion resistance. Moreover, the inventors of the present invention found that the plurality of protrusions and constrictions formed in the periphery of the flat monofilament in the woven fabric of the present invention lead to the periphery being a rough surface that allows light to penetrate through irregular reflection. Light scattering from the surface, which helps reduce the see-through properties of the woven fabric and prevents items from being seen through the woven fabric without significantly reducing the amount of light transmitted through the woven fabric (the amount of light emitted through the woven fabric). the

Moreover, the inventors of the present invention have found that the air permeability of the flat multifilament yarn woven fabric of the present invention can be appropriately controlled by properly determining the cover factor of the flat multifilament yarn woven fabric of the present invention in the range from 800 to 3500. properties, water and sweat absorption, abrasion resistance and see-through resistance, therefore, different types of textile materials are available with the above properties. the

The present invention has been achieved based on the above findings. the

The flat multifilament yarn woven fabric of the present invention comprises a plurality of multifilament yarns as warps and/or wefts, each multifilament yarn comprising a plurality of artificial monofilaments, the main components of which include fiber forming synthetic polymeric and have a flat cross-sectional shape. the

For example, referring to Fig. 1, in the above-mentioned flat multifilament yarn woven fabric, the outside of the cross-section 1 of one monofilament forms a flat shape, wherein compared with the longitudinal length of the shape, in the direction perpendicular to the longitudinal centerline of the shape The width is smaller. the

In the cross-sectional profile 1 shown in Fig. 1, 3 or more protrusions 3 (4 protrusions in Fig. portion), and two or more constrictions 4 (three constrictions in FIG. 1 ) formed between the protruding portions are respectively formed on each side portion of the profile, and are almost symmetrical with respect to the longitudinal centerline 2. In the cross-sectional profile of Figure 1, the flatness of the cross-sectional profile is in the range of 2 to 6, which is determined by the maximum length (B) of the profile in the direction of the longitudinal centerline and the dimension of the profile in the direction perpendicular to the longitudinal centerline. It is indicated by the ratio (B/C1) of the maximum width (C1). the

In the cross-sectional profile of each flat monofilament, 3 or more protrusions and 2 or more constrictions formed on one side portion of the flat profile are almost symmetrical in shape and position with respect to the longitudinal centerline of the flat profile, On a side portion opposite to the above-mentioned one side portion of the flat profile, 3 or more protrusions and 2 or more constrictions are formed. the

In the above cross-sectional shape of the flat monofilament of the multifilament yarn, the number of protrusions is 3 or more, preferably 4 or more, more preferably 4 to 6. Also, the number of constricted portions is 2 or more, preferably 3 or more, more preferably 3 to 5 in each side portion of the flat profile. Also, the flatness of the cross-sectional profile is 2 to 6, preferably 3 to 5. the

If the number of protrusions is 2 or less and the number of constrictions is 1 or less, the outer periphery of the formed monofilament exhibits an increase in frictional resistance, so that at the portion where the warp and weft of the woven fabric intersect each other, part, the compressive forces of the warp and weft interact, the sliding and spreading of the monofilaments is not sufficient, the air permeability of the formed woven fabric becomes difficult to control, the wear resistance of the formed woven fabric is not sufficient, and the number of shrinkage parts is reduced leading to the formation of The water-absorbing and sweat-absorbing properties of the woven fabric are insufficient, and the light-scattering effect at the periphery of the monofilament is insufficient, so that the formed woven fabric exhibits unsatisfactory see-through resistance. the

In the flat multifilament yarn woven fabric of the present invention, the monofilaments of the flat multifilament yarn have a cross-sectional flatness (B/C1) of 2 to 6, preferably 3 to 5. If the cross-sectional flatness is less than 2, the bending resistance (rigidity) of the monofilament is too high, and the resulting woven fabric exhibits insufficient softness, so that the targeted soft touch of the woven fabric cannot be obtained. the

Moreover, when the cross-sectional flatness is less than 2, in the intersecting portion of the warp and weft of the woven fabric, due to the compressive force between the warp and the weft, the sliding spread of the monofilament in the multifilament yarn is insufficient, and the warp The gap between the yarn and the weft cannot be small enough, and the space size between the filaments cannot be small enough, so that the air permeability of the formed woven fabric is difficult to control to an ideal level. the

Also, monofilaments with a cross-sectional flatness (B/C1) greater than 6 are difficult to manufacture. the

In the cross-sectional profile of the flat monofilament of the flat multifilament yarn usable in the woven fabric of the present invention, in the direction perpendicular to the longitudinal centerline of the flat profile, the ratio of the maximum width (C1) to the minimum width (C2) (C1/C2) is preferably in the range of 1.05 to 4.00, more preferably 1.10 to 2.50. The aforementioned ratio (C1/C2) is a parameter related to the depth of the constricted portion of the flat monofilament. If the ratio (C1/C2) is less than 1.05, that is, the depth of the constriction is too small, the outer peripheral surface of the formed flat monofilament may exhibit too high frictional resistance, and the formed woven fabric may exhibit too high air permeability and insufficient Abrasion resistance, see-through resistance, and water and sweat absorption. Also, if the ratio (C1/C2) is greater than 4.0, the depth of the constricted portion of the flat monofilament is too large, the effect of the constricted portion is saturated, and the formed woven fabric may be unfavorable because the filament forming process may be unstable and the formed monofilament may be Sliding along the constriction, the uniformity of the cross-sectional shape of the monofilament may decrease. the

In each of Figs. 2 and 3, another example of the cross-sectional shape of flat monofilaments that cannot be used in the flat multifilament yarn woven fabric of the present invention is shown. the

The cross-section of the wire 1 shown in FIG. 2 has a profile which, compared to FIG. The profile of the shown protrusion presents an elliptical arch extending along the main axis of the ellipse, and the elliptical arch formed in this way is gentler than the round arch of the protrusion in Fig. 1, and like this, the depth of the constriction in Fig. smaller. the

The cross-sectional profile of the wire 1 shown in FIG. 3 has protrusions and constrictions formed on both side portions of the flat profile with respect to the longitudinal centerline, and respectively numbered on each side of the flat profile. for 4 and 3. In Fig. 3, the protrusion 3a is smaller in width and height than the other three protrusions 3, so that the depth of the constriction 4a formed on both sides of the protrusion 3a is from the top of the protrusion 3a to the constriction 4a The depth of the bottom of the constriction is smaller than that of the other constrictions 4 . the

As mentioned above, the cover factor of the flat multifilament yarn woven fabric is in the range from 800 to 3500, and the above range can be properly determined according to the necessary properties and properties of the woven fabric. the

The cover factor (CF) of a woven fabric is defined by the following formula. the

CF＝(DWp/1.1) ^1/2 xNWp+(DWf/1.1) ^1/2 xMWf

In the above formula,

DWp represents the total thickness of the warp (dtex),

MWp represents the weaving density of the warp (yarn/2.54cm)

DWf represents the total thickness of the weft (dtex),

MWf represents the weaving density of the weft (yarn/2.54cm)

In the flat multifilament yarn woven fabric of the present invention, if the cover factor (CF) of the woven fabric is less than 800, the gap between the warp and the weft is large, and the air permeability of the woven fabric is difficult to control to the desired value, and has the desired Woven fabrics with a high level of see-through resistance are difficult to manufacture. the

Also, if the cover factor (CF) is greater than 3500, the resulting woven fabric exhibits insufficient softness, and unsatisfactory light transmittance (illumination). the

The fiber-forming polymers useful for forming the flat multifilament yarns of the flat multifilament yarn woven fabrics of the present invention may be selected from such fiber-forming synthetic polymers as polyester, polyamide, polyvinylidene chloride, polypropylene Resins; fiber-forming semi-synthetic polymers, such as cellulose acetate, and recycled polymers, such as regenerated cellulose, among others. In view of the ease or difficulty of making flat multifilament yarns, fiber-forming thermoplastic polymers can be formed into fibers by, for example, melt spinning, preferably using e.g. polyester, polyethylene terephthalate, cyclopropane para Phthalates, etc.; polyamides such as nylon 6, nylon 66, etc., polyvinylidene chloride and polypropylene. the

In the fiber-forming synthetic polymer, an additive may be mixed, the additive comprising at least one component selected from, for example, a delustering agent (for example, titanium dioxide, etc.), a pore former (for example, an organic sulfonic acid metal salt, etc.), a cationic Dye dyeability additives (such as sulfonium isophthalate salt, etc.), antioxidants (such as hindered phenolic compounds, etc.), heat stabilizers, flame retardants (such as antimony trioxide, etc.), fluorescent brighteners, Coloring materials, antistatic agents, (for example, organic sulfonates, etc.), moisture conditioners (for example, polyoxyalkylene glycol, etc.), and fine particles of antibacterial agents, etc. the

There is no limit to the total thickness of multifilament yarns and the thickness of flat monofilaments usable in the woven fabric of the present invention as long as the target woven fabric of the present invention can be obtained. Usually, the overall thickness of the yarn is preferably 30 to 170 dtex, more preferably 50 to 100 dtex, and the thickness of the monofilament is preferably 0.5 to 5 dtex, more preferably 1 to 4 dtex. the

Also, there is no limit to the twist number of the flat multifilament yarn that can be used for the flat multifilament yarn woven fabric of the present invention as long as the target woven fabric of the present invention can be obtained. the

That is, the number of twists can be appropriately determined according to the usage and necessary properties of the target woven fabric. Usually, the number of twists is preferably from 0 to 2500 turns/m, more preferably from 0 to 600 turns/m. the

The multifilament yarns usable in the woven fabric of the present invention may be textured yarns formed by false twisting, TASLAN, or air synthetic fiber texturing methods such as air-jet entanglement, as long as the target woven fabric of the present invention can be obtained. the

In the woven fabric of the present invention, the warp and/or weft constituting the woven fabric must be composed of a multifilament yarn including a plurality of monofilaments having the above-mentioned flat cross-sectional shape. the

That is, the flat multifilament yarn may be used as the warp and the weft, or may be used as either of the warp and the weft, and either of the warp and the weft may be composed of a different yarn from the flat multifilament yarn. the

The different yarns may be selected from monofilament yarns, multifilament yarns, and spun yarns. These different yarns can have specific properties such as antistatic properties, luster, etc. Also, among the warps and/or wefts usable in the woven fabric of the present invention, a small amount of filaments or fibers other than flat monofilaments may be used in combination with the flat multifilament yarn as long as the target woven fabric of the present invention can be obtained. the

In the flat multifilament yarn woven fabric of the present invention, based on the total mass of the woven fabric, the mass content of the flat multifilament yarn is preferably from 10 to 100%, more preferably from 20 to 100%, most preferably from 40 to 100%. %. the

The flat multifilament yarn used in the woven fabric of the present invention is produced using a flat filament spinneret, for example, a spinneret provided with a plurality of spinning holes having Japanese Unexamined Patent Work Document Cross-sectional profile shown in Figure 2-C on page 5 of 56-107044. the

The flat multifilament yarn woven fabric of the present invention can be manufactured using a conventional weaving process, wherein the flat multifilament yarn manufactured as described above is used as warp and/or weft, and can be dyed and finished by conventional dyeing and finishing processes. processing. Where the flat multifilament yarn is a flat polyester multifilament yarn, the resulting woven fabric can be subjected to a downgrading treatment with alkali. Moreover, in the finishing process, the woven fabric may be simultaneously or continuously subjected to one or more water absorption enhancing treatments (by coating or impregnation with water-absorbing agents such as anionic hydrophilic polymers), hydrophobic treatments (by hydrophobic agents such as hydrophobic fluorine compound coating or impregnation), ultraviolet blocking treatment (by performing dispersion of ultrafine particles of metal oxide), antistatic treatment, application of deodorant treatment, application of mothproof agent treatment, and application of optical storage agent treatment. the

In one embodiment of the flat multifilament yarn of the present invention, the thickness of the warp and weft threads and the weave density of the warp and weft threads are controlled to such an extent that the cover factor of the resulting woven fabric is in the range from 1500 to 3500. the

In the embodiment (1) of the present invention, the cover factor of the woven fabric is preferably in the range of 1500-3000, most preferably in the range of 1500-2500. the

Moreover, in the embodiment (1) of the present invention, the flat multifilament yarn preferably has a twist number of 0 to 2500 turns/m, more preferably has a twist number of 0 to 600 turns/m, most preferably 0 turns /m, that is, no twisting. the

In the embodiment (1) of the present invention, the flat multifilament yarn woven fabric preferably has an air permeability of 5 ml/cm ² ·sec or less, more preferably has an air permeability of 4 ml/cm ² ·sec or less, It is preferable to have an air permeability of 0.1 ml/cm ² ·sec to 3 ml/cm ² ·sec. Air permeability was determined in accordance with JIS L _1096-1998 , 6.27.1, method A (using a Frazir type testing machine).

In the embodiment (1) of the present invention, the flat multifilament yarn woven fabric preferably has a water absorption speed of 40 mm or more, more preferably a water absorption speed of 50 to 70 mm, according to JIS _L1096-1998 , 6.26.1, (2) Determined by method B (Byreck method), and, preferably, has an abrasion resistance of 50 or more, more preferably has an abrasion resistance of 80 or more, most preferably has an abrasion resistance of 100 or more wear resistance.

In the embodiment (1) of the present invention, if the cover factor (CF) of the woven fabric is less than 1500, the gap area formed between the warp and weft may be too large, and the resulting woven fabric may exhibit too high air permeability (for example, more than ml/cm ² ·sec), and insufficient water and sweat absorption, and insufficient abrasion resistance. Also, if the cover factor (CF) of the woven fabric is greater than 3500, warp threads and weft threads in the resulting woven fabric may be in close contact with each other, and the resulting woven fabric may have insufficient soft hand, and too high flexural strength, Thus, the hand of the woven fabric may become unsatisfactory, and the abrasion resistance of the woven fabric may not be sufficient.

In the flat multifilament yarn woven fabric having a cover factor of 1500 to 3500 of the embodiment (1) of the present invention, due to the compressive force generated at the intersecting portion of the warp and weft of the woven fabric, the warp and/or threads constituting the woven fabric The flat multifilament yarns of the weft or weft are more flattened and spread laterally, under which the flattened monofilaments contact each other at their flattened peripheries and slide against each other laterally so as to flatten the yarn. In the flattened yarns, the area of the gaps between the warp and weft threads is reduced such that the resulting woven fabric exhibits reduced air permeability. Therefore, the flat multifilament yarn woven fabric of Example (1) of the present invention preferably exhibits a low air permeability of 5 ml/cm ² ·sec or less.

In the embodiment (1) of the present invention, the flattening of the flat multifilament yarn resulted in the resulting woven fabric exhibiting a decrease in flexural strength, an increase in softness, and a good soft hand. Also, in the woven fabric of the embodiment (1) of the present invention, each flat monofilament in the multifilament yarn has 3 or more protrusions extending in the longitudinal direction of the periphery at each side portion of its flat shape. portion, and 2 or more constricted portions formed between the protruding portions, so that the periphery of the flat monofilament becomes rough. In this way, when the monofilaments in the yarn are in contact with each other, especially under the action of the compressive force generated by the intersecting parts of the warp and weft threads, the contact area of the monofilaments in contact with each other is small, so that the frictional resistance between the monofilaments smaller. Thus, the roughened periphery of the monofilaments helps to enhance the softness of the resulting woven fabric. Furthermore, even when the peripheries of the monofilaments are in contact with each other, in the peripheries of each monofilament, the constricted portions extending in the longitudinal direction of the peripheries do not or substantially do not approach. Therefore, water or sweat easily spreads along the constricted portion due to the capillary phenomenon, so that the resulting woven fabric exhibits excellent water and sweat absorption properties. the

The flat multifilament yarn woven fabric of the embodiment (1) of the present invention exhibits excellent soft hand feeling, high water absorption and sweat absorption, and high wear resistance, so it is very useful as a low air permeability textile material for different clothes, Different garments are, for example, sportswear, men's and women's uniforms, and national clothing (national clothing), such as tabes, underwear, shirts, hats, woven fabrics for umbrellas and parasols. the

In one embodiment (2) of the flat multifilament yarn woven fabric of the present invention, the multifilament yarn contains a delustering agent in an amount of 0.2% by mass or higher, more preferably 0.4 to 3.5% by mass. The delustering agent preferably comprises a delustering agent with a mass content of 1.0 to 2.5%. The cover factor (CF) of the woven fabric is in the range from 1300 to 3000, preferably 1400 to 2500. the

The composition and type of the delustering agent contained in the multifilament yarn of the flat multifilament yarn woven fabric of Example (2) of the present invention are not limited as long as the target woven fabric of the present invention can be obtained. Typically, matting agents may include at least one type of fine inorganic particles, such as titanium dioxide and barium surfaces. Depending on the total mass of the multifilament, if the mass content of the delustering agent is less than 0.2%, the resulting multifilament yarn may exhibit insufficient reflectivity, and thus, the resulting woven fabric may not be able to exhibit satisfactory visual see-through resistance. It should be noted that if the content of the delustering agent is greater than 7% by mass, the fiber-forming properties of the resulting polymer component may become unstable. the

If the cover factor (CF) of the woven fabric of Example (2) of the present invention is less than 1300, the gap area formed between the warp and weft may be too large, and the resulting woven fabric may exhibit unsatisfactory anti-see-through sex. Also, if the cover factor (CF) of the woven fabric is greater than 3000, the resulting woven fabric may exhibit insufficient softness and unsatisfactory hand. the

In the case where the woven fabric of the embodiment (2) of the present invention has a plain weave structure, the cover factor (CF) of the plain weave is preferably in the range from 1400 to 1800, more preferably from 1400 to 1800. 1500 to 1700 range. the

In the case where the woven fabric of the embodiment (2) of the present invention has a twill structure, the cover factor (CF) of the resulting twill woven fabric is preferably in the range from 1900 to 2400, more preferably in the range of range from 2000 to 2300. the

There is no particular limitation on the twist number of the multifilament yarn usable for the woven fabric of Example (2) of the present invention as long as the target woven fabric of the present invention can be obtained. However, in order to fully ensure that the monofilaments in the yarn move relatively freely, the twist number of the flat multifilament yarn is preferably 0 to 1500 turns/m, more preferably 0 to 600 turns/m, most preferably 0 turns /m, that is, without twisting. the

In embodiment (2) of the present invention, the flat multifilament yarn woven fabric preferably has certain anti-see-through degree, and in L*a*b* color system, this woven fabric anti-see-through degree is represented by difference ΔL(= L* _W -L* _b ) means that the difference ΔL is 15 or less, preferably 10 to 13, the difference ΔL being the L* value of the woven fabric expressed in L* _W and The difference between the L* values of the woven fabrics placed on the blackboard expressed as L* _b . If the see-through resistance ΔL is greater than 15, the see-through resistance of the resulting woven fabric may be insufficient in practice.

In the embodiment (2) of the present invention, the flat multifilament yarn woven fabric preferably has a water absorption speed of 40 mm or more, more preferably has a water absorption speed of 45 mm or more, most preferably has a water absorption speed of 50 to 70 mm, This is determined according to JIS L _1096-1998 , 6.26.1, (2) method B (Byreck method). If the water absorption speed is less than 40 mm, the resulting woven fabric practically exhibits insufficient water and sweat absorption.

In the flat multifilament yarn woven fabric of Example (2) of the present invention, the cross-sectional profile of the monofilaments constituting the flat multifilament yarn is flat. In the flat cross-sectional profile, three or more protrusions and two or more constrictions between the protrusions are formed at each side portion of the flat profile. Thus, the peripheries of the monofilaments in contact with each other exhibit low mutual frictional resistance and can easily slide against each other. When a compressive force acts on the multifilament yarn, the monofilaments can easily move relative to each other along the contact periphery, and thus, the multifilament yarn flattens and expands laterally. Also, the monofilaments are in close contact with each other at the flat periphery so that the gaps between the yarns arranged in the woven fabric are reduced and the amount of light transmitted through the woven fabric is reduced. Also, the delustering agent contained in the monofilament at a mass content of 0.2% reduces light transmitted through the resulting woven fabric, and causes light irradiated on the woven fabric to be reflected irregularly on the woven fabric. Also, the plurality of protrusions and constrictions formed on the periphery of the monofilament cause the periphery of the monofilament to be roughened so as to scatter incident light and prevent seeing through the woven fabric. At the intersection of the warp and weft of the woven fabric, the flattening and spreading of the multifilament yarns results in a softer intersection and the resulting woven fabric has a softer hand. the

Furthermore, the constricted portion extending along the longitudinal axis of the monofilament wicks the generated water and sweat, and the resulting woven fabric exhibits a high water and sweat absorption rate. the

Thus, the flat multifilament yarn woven fabric of the embodiment (2) of the present invention is useful as a textile material, and it is necessary to have high see-through resistance and water and sweat absorption when used for example for shirts, sportswear and uniforms. . the

In one embodiment (3) of the flat multifilament yarn woven fabric of the present invention, the rayon of the multifilament yarn contains a small amount of delustering agent in a mass content of 0 to 0.2%. The cover factor of the woven fabric ranges from 800 to 2000. the

The mass content of the delustering agent in the rayon is 0 to 0.2%, preferably 0 to 0.1%. Even better, there is no deluster in the monofilament. The matting agent of the present invention may be selected from conventional matting agents such as titanium dioxide and barium surfaces. If the mass of delustering agent is greater than 0.2%, in the preferred application of the woven fabric of embodiment (3) of the present invention, such as curtains, the resulting woven fabric may exhibit insufficient light transmittance, which has unsatisfactory illuminance. Brightness. the

In the flat multifilament yarn woven fabric of the embodiment (3) of the present invention, the multifilament yarn preferably has a twist number of 0 to 1000 turns/m, more preferably 0 to 200 turns/m, Preferably without twisting. the

The cover factor (CF) of the flat multifilament yarn woven fabric of the embodiment (3) of the present invention is preferably in the range from 80 to 200, more preferably from 900 to 1800, most preferably From 1000 to 1800. the

In the best use of the flat multifilament yarn woven fabric of embodiment (3) of the present invention, such as curtains, if the cover factor (CF) is less than 800, the gap area between the warp and weft in the woven fabric may be too large. Large, resulting woven fabrics may exhibit unsatisfactory see-through resistance. Also, if the cover factor (CF) of the woven fabric is greater than 2000, the resulting woven fabric may exhibit insufficient illumination. the

The flat multifilament yarn woven fabric of the embodiment (3) of the present invention preferably exhibits a light transmittance of 10 to 70%, more preferably 20 to 50%, which is determined according to JIS L _1055-1987 , 6.1, method A, With illuminance of 100000Lx. Light transmission in percent was calculated by subtracting the percent opacity of the woven fabric from 100%. If the light transmittance is less than 10%, the resulting woven fabric may not be sufficiently illuminated in preferred uses of the woven fabric, such as curtains. Also, if the light transmittance is greater than 70%, the resulting woven fabric may exhibit insufficient see-through resistance.

The flat multifilament yarn woven fabric of the embodiment (3) of the present invention is preferably colorless, or dyed in a light or moderate color. The type and amount of pigment used for dyeing can be determined according to the use and necessary properties of the resulting dyed woven fabric. the

In the flat multifilament yarn woven fabric of Example (3) of the present invention, the flat multifilaments expand laterally and flatten at the intersecting portion of the warp and weft of the woven fabric due to the action of compressive force generated at the intersecting portion , the monofilaments are in close contact with each other at their flat peripheries to form a dense structure. In this dense structure, the gap between the warp and weft threads is small, and the amount of light passing through the gap is reduced. A small amount of light passing through the gap is scattered in the small gap, and the transmitted light rays passing through the small gap close to each other interfere with each other, so as to enhance the anti-see-through effect of the woven fabric. Moreover, compared with filaments with a flat cross-sectional profile and provided with a smooth periphery, filaments with a circular cross-sectional profile, and filaments with a triangular cross-sectional profile, the special cross-sectional shape of the flat monofilaments in the multifilament yarn The cross-sectional profile results in irregular reflection of incident light at the periphery of the monofilament, and increased refraction of light transmitted through the filament. In this way, the resulting woven fabric exhibits excellent see-through resistance without reducing its illuminance. the

The flat multifilament yarn woven fabric of Example (3) of the present invention exhibited good soft hand, low flexural strength, low air permeability, and high abrasion resistance, similar to Examples (1) and (2). the

For the above reasons, the flat multifilament yarn woven fabric of the embodiment (3) of the present invention is useful for indoor see-through prevention materials such as curtains, roller blinds (curtains) and partitions. the

example

The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. the

Example 1

The polyethylene terephthalate resin was melt-extruded at a temperature of 300° C. through 30 melt spinning holes formed in the melt spinneret and having filaments corresponding to those shown in FIG. 1 Hole shape of a cross-sectional profile having, on each side portion of the profile, 4 arc-shaped protrusions and 3 constrictions formed between the arc-shaped protrusions, which are formed at the longitudinal centerline of the profile on both sides. The extruded silk melt flow is taken up at a take-up speed of 4000m/min, while the melt flow is cooled and solidified. The finally formed drawn multifilaments were drawn directly at a draw ratio of 1.3 at a temperature of 97° C. without entanglement to produce drawn multifilament yarns with a yarn count of 84 d t/30 filaments. The monofilament of the multifilament had the cross-sectional profile shown in Fig. 1, the flatness of the cross-sectional profile was 3.2, and the filament width ratio C1/C2 was 1.2. the

Flat multifilaments were used as warp and weft yarns, which were left untwisted to produce a plain weave with the following warp and weft densities. the

Warp density: 101 warp yarns/2.54cm. the

Weft density: 90 warp yarns/2.54cm. the

In the final formed plain weave, the content of the flat multifilament is 100%. Finishing of plain weave by washing and dyeing. The finished plain weave had a cover factor of 1782. the

The finished plain weave was subjected to the following tests. the

(1) Breathability

The air permeability of the woven fabric was determined according to JIS L _1096-1998 , 6.27.1, Method A (using a Frazir type testing machine).

(2) Abrasion resistance

The abrasion resistance of the woven fabric was determined according to JIS L _1096-1998 , 6.17.1, (1), method A-1 (flattened surface method).

(3) water absorption

The water absorption speed of the woven fabric was determined according to JIS L _1096-1998 , 6.26.1, (2), method B (Byreck method).

(4) Feel

The hand of the woven fabric was evaluated as the following 5 grades by touching with hands. the

(5) Comprehensive evaluation

The overall evaluation results of the woven fabrics after the test are shown in the following four grades. the

The test results are shown in Table 1. the

Example 2

Plain weaving of flat multifilaments was produced and tested by the same procedure as in Example 1 with the exceptions shown below. the

In the cross-sectional profile of the flat monofilament, the number of arc-shaped protrusions changes from 4 to 3, and the number of constrictions changes from 3 to 2 at each side portion of the longitudinal centerline of the flat profile. the

The flatness (B/C1) of the flat cross-sectional profile was 3.2, the ratio (C1/C2) was 1.2, and the cover factor of the plain weave was 1782. the

The test results are shown in Table 1. the

comparative example

Example 1

Plain weaving of flat multifilaments was produced and tested by the same procedure as in Example 1 with the exceptions shown below. the

In the flat cross-sectional profile of the monofilament, no constrictions are formed. the

The flatness (B/C1) of the flat cross-sectional profile was 3.2, the ratio (C1/C2) was 1.0, and the cover factor of the plain weave was 1782. the

The test results are shown in Table 1. the

comparative example

Example 2

Plain weaving of flat multifilaments was produced and tested by the same procedure as in Example 1 with the exceptions shown below. the

The flat cross-sectional profile of the monofilament becomes a circular cross-sectional profile. the

The resulting plain weave had a cover factor of 1782. the

The test results are shown in Table 1. the

Table 1

Example 3

A polyethylene terephthalate resin containing 2.5% by mass of a delustering agent composed of titanium dioxide was melt-extruded at a temperature of 300°C through 30 melt-spinning holes formed in the melt-spinning In the head and having a hole shape corresponding to the cross-sectional profile of the wire shown in FIG. Constrictions, which are formed on both side portions of the longitudinal centerline of the profile. While cooling and solidifying the melt stream, the extruded silk melt stream was coiled at a coiling speed of 4000 m/min. The finally formed drawn multifilament was drawn directly without taking up at a draw ratio of 1.3 at a temperature of 97° C. to prepare drawn multifilament having a yarn count of 84 dt/30 filaments. The monofilament of the multifilament had the cross-sectional profile shown in Fig. 1, the flatness of the cross-sectional profile was 3.2, and the filament width ratio C1/C2 was 1.2. the

Flat multifilaments were used as warp and weft yarns, which were left untwisted to produce a plain weave with the following warp and weft densities. the

Warp density: 101 warp yarns/2.54cm. the

Weft density: 90 warp yarns/2.54cm. the

In the final formed plain weave, the content of the flat multifilament is 100%. Finishing of plain weave by washing and dyeing. The finished plain weave had a cover factor (CF) of 1700. the

The resulting woven fabrics were subjected to the following tests. the

(1) Anti-perspective degree

In the L*a*b* color system, use the L* value of the woven fabric placed on a white board, denoted by L* _w , and the L* value of a woven fabric placed on a black board, denoted by L* _b indicates that the difference ΔL (= L* _w - L* _b ) indicates the anti-see-through degree of the woven fabric under test.

(2) water absorption

The water absorption speed of the woven fabric was determined according to JIS L _1096-1998 , 6.26.1, (2), method B (Byreck method), as in Example 1.

(3) Feel

The hand of the woven fabric was evaluated in the following 5 grades by touching with hands, as in Example 1. the

(4) Comprehensive evaluation

The overall evaluation results of the tested woven fabrics are shown in the following four grades, as in Example 1. the

The test results are shown in Table 2. the

Example 4

Plain weave of flat multifilaments was produced and tested by the same procedure as Example 3 with the exception shown below. the

In the cross-sectional profile of the flat monofilament, the number of arc-shaped protrusions changes from 4 to 3, and the number of constrictions changes from 3 to 2 at each side portion of the longitudinal centerline of the flat profile. the

The flatness (B/C1) of the flat cross-sectional profile was 3.2, the ratio (C1/C2) was 1.2, and the cover factor of the plain weave was 1700. the

The test results are shown in Table 2. the

comparative example

Example 3

Plain weave of flat multifilaments was produced and tested by the same procedure as Example 3 with the exception shown below. the

In the flat cross-sectional profile of the monofilament, no constrictions are formed. the

The flatness (B/C1) of the flat cross-sectional profile was 3.2, the ratio (C1/C2) was 1.0, and the cover factor of the plain weave was 1700. the

The test results are shown in Table 2. the

comparative example

Example 4

Plain weave of flat multifilaments was produced and tested by the same procedure as Example 3 with the exception shown below. the

The flat cross-sectional profile of the monofilament becomes a circular cross-sectional profile. the

The resulting plain weave had a cover factor of 1700. the

The test results are shown in Table 2. the

Table 2

Example 5

The polyethylene terephthalate resin was melt-extruded at a temperature of 300° C. through 30 melt spinning holes formed in the melt spinneret and having filaments corresponding to those shown in FIG. 1 Hole shape of a cross-sectional profile having, on each side portion of the profile, 4 arc-shaped protrusions and 3 constrictions formed between the arc-shaped protrusions, which are formed at the longitudinal centerline of the profile on both sides. While the melt flow was cooled and solidified, the extruded silk melt flow was taken up at a take-up speed of 4000 m/min. The finally formed drawn multifilament was directly drawn without being entangled at a draw ratio of 1.3 at a temperature of 97° C. to prepare a drawn multifilament having a yarn count of 84 dt/30 filaments. The monofilament of the multifilament had the cross-sectional profile shown in Fig. 1, the flatness of the cross-sectional profile was 3.2, and the filament width ratio C1/C2 was 1.2. the

Flat multifilaments were used as warp and weft yarns, which were left untwisted to produce a plain weave with the following warp and weft densities. the

Warp density: 63 warp yarns/2.54cm. the

Weft density: 52 warp yarns/2.54cm. the

In the final formed plain weave, the content of the flat multifilament is 100%. Finishing of plain weave by washing and dyeing. The finished plain weave had a cover factor (CF) of 1000. the

The resulting woven fabrics were subjected to the following tests. the

(1) Light transmittance

Under an illuminance of 100000 Lx, according to JIS L _1055-1987 , 6.1, method A, the light blocking rate of the woven fabric was measured, and the light transmittance of the woven fabric was calculated according to the following equation.

Light transmittance (%) = 100- light blocking rate (%)

(2) anti-perspective property

Perspective resistance during the day

By using an 80W fluorescent lamp in the room to provide 700Lx illuminance lighting in the room, an article viewed through the woven fabric (color: red, shape: cuboid, size: 15cm x 7cm x 7cm) was placed at a position 20cm away from the surface of the woven fabric, And the observer's naked eyes are located outside the room at a position 30cm away from the opposite surface of the woven fabric, and the illuminance of sunlight is 100000Lx, so that the observer can see the article through the woven fabric. the

The see-through resistance of the daytime woven fabric was evaluated in the following 4 grades. the

Perspective resistance at night

Except at night when the illuminance is 0.2Lx, and the observer of the article is located outside the room, use the same method as during the day to test the anti-see-through property of the woven fabric at night. the

The see-through resistance of woven fabrics at night was evaluated on the same 4 levels as during the day. the

The test results are shown in Table 3. the

Example 6

Plain weave of flat multifilaments was produced and tested in the same procedure as in Example 5, with the exceptions shown below. the

The plain weave fabric structure became to have a warp density of 55 warp yarns/2.54 cm and a weft density of 36 weft yarns/2.54 cm, and the resulting plain weave had a cover factor (CF) of 880. the

The test results are shown in Table 3. the

Example 7

Plain weave of flat multifilaments was produced and tested in the same procedure as in Example 5, with the exceptions shown below. the

The plain weave fabric structure became to have a warp density of 112 warp yarns/2.54 cm and a weft density of 74 weft yarns/2.54 cm, and the resulting plain weave had a cover factor (CF) of 1800. the

The test results are shown in Table 3. the

Example 8

Plain weave of flat multifilaments was produced and tested in the same procedure as in Example 5, with the exceptions shown below. the

The flat multifilament was twisted at a twist count of 200 turns/m, and the cover factor (CF) of the finally formed plain weave was 1000. the

The test results are shown in Table 3. the

comparative example

Example 5

Plain weave of flat multifilaments was produced and tested in the same procedure as in Example 5, with the exceptions shown below. the

The flat cross-sectional profile of the monofilaments of the multifilament has no constrictions. (flatness of flat profile: 3.2, ratio (C1/C2): 1.0)

The resulting woven fabric had a cover factor (CF) of 1000. the

The test results are shown in Table 3. the

comparative example

Example 6

Plain weave of flat multifilaments was produced and tested in the same procedure as in Example 5, with the exceptions shown below. the

The flat cross-sectional profile of the monofilaments of the multifilament is changed to a triangular cross-sectional profile. the

The resulting woven fabric had a cover factor (CF) of 1000. the

The test results are shown in Table 3. the

comparative example

Example 7

Plain weave of flat multifilaments was produced and tested in the same procedure as in Example 5, with the exceptions shown below. the

The flat cross-sectional profile of the monofilaments of the multifilament is changed to a circular cross-sectional profile. the

The resulting woven fabric had a cover factor (CF) of 1000. the

The test results are shown in Table 3. the

comparative example

Example 8

Plain weave of flat multifilaments was produced and tested in the same procedure as in Example 6, with the exceptions shown below. the

The flat cross-sectional profile of the monofilaments of the multifilament is changed to a triangular cross-sectional profile. the

The resulting woven fabric had a cover factor (CF) of 880. the

The test results are shown in Table 3. the

comparative example

Example 9

Plain weave of flat multifilaments was produced and tested in the same procedure as in Example 7, with the exceptions shown below. the

The flat cross-sectional profile of the monofilaments of the multifilament is changed to a triangular cross-sectional profile. the

The resulting woven fabric had a cover factor (CF) of 1800. the

The test results are shown in Table 3. the

table 3

Industrial applicability of the present invention

In the flat multifilament yarn fabric of the present invention, the specific flat cross-sectional profile of the monofilaments in the multifilaments enables the monofilaments to slide relatively easily due to the compressive pressure generated at the intersecting portions of the warp and weft yarns, As a result, the multifilaments can flatten and spread out laterally, and the gaps between the yarns are narrowed. Therefore, the air permeability of the woven fabric can be properly controlled. The woven fabric finally formed by the present invention exhibits high wear resistance and good water absorption and perspiration, and the incident light can be scattered through light diffraction and irregular reflection, so as to reduce the visual transmission characteristics of the woven fabric without Will significantly reduce the light transmittance of the woven fabric. Accordingly, the flat multifilament woven fabrics of the present invention are useful as low light transmission textile materials, see-through anti-textile materials, water-absorbent and perspiration-wicking textile materials, and lighting-resistant, vision-transmitting textile materials. the

Claims (20)

1. A flat multifilament yarn woven fabric for clothing materials or interior materials, comprising a plurality of multifilament yarns comprising a plurality of rayon monofilaments, the rayon monofilaments mainly comprising polyester Ester polymers and having a flat cross-sectional profile; wherein on both sides of the longitudinal centerline of the flat cross-sectional profile of each artificial monofilament, 4-6 protrusions protrude outward from the longitudinal centerline on each side portion, and each side portion is formed between the protrusions 3-5 constrictions are formed almost symmetrically with respect to the longitudinal centerline, and the flatness of the cross-sectional shape is 2 to 6, which is determined by the maximum length (B) of the cross-sectional shape in the direction of the longitudinal centerline and the cross-sectional shape Expressed by the ratio (B/C1) of the maximum width (C1) in the direction perpendicular to the longitudinal centerline, and the woven fabric has a cover factor of 800 to 3500, characterized in that the total thickness of each multifilament yarn is 30 to 170 dtex . 2. The flat multifilament yarn woven fabric as claimed in claim 1, characterized in that, in the cross-sectional profile of the rayon monofilament, the ratio (C1/C2) of the maximum width (C1) to the minimum width (C2) is between in the range of 1.05 to 4.00. 3. The flat multifilament yarn woven fabric according to claim 1, wherein the total thickness of the multifilament yarns is in the range of 30 to 170 dtex, and the thickness of the monofilaments is in the range of 0.5 to 5 dtex. 4. The flat multifilament yarn woven fabric according to claim 1, which has a weave structure selected from plain weave, twill weave, and satin weave structures. 5. The flat multifilament yarn woven fabric according to claim 1, wherein the mass content of the multifilament yarn including artificial monofilaments having a flat cross-sectional profile is 10 to 100% based on the mass of the fabric. 6. The flat multifilament yarn woven fabric of claim 1, wherein the woven fabric has a cover factor in the range of 1500 to 3500. 7. The flat multifilament yarn woven fabric according to claim 6, wherein the multifilament yarn has a twist number of 0 to 2500 turns/m. 8. The flat multifilament yarn woven fabric according to claim 6, which has an air permeability of 0.1 to 5 ml/cm ² ·sec, which is based on JIS L _1096-1998 , 6.27.1, using a Frazir type The testing machine is confirmed. 9. The flat multifilament yarn woven fabric according to claim 8, wherein the air permeability is in the range of 0.1 to 4.0 ml/cm ² ·sec. 10. The flat multifilament yarn woven fabric according to claim 6, characterized in that it has a water absorption speed of 40 mm to 70 mm, which is determined using the Byreck method according to JIS L _1096-1998 , 6.26.1, (2). 11. The flat multifilament yarn woven fabric as claimed in claim 1, wherein the artificial monofilament of the multifilament yarn comprises a delustering agent with a mass content of 0.2%-7%, and the cover factor of the woven fabric is in the range of In the range of 1300 to 3000. 12. The flat multifilament yarn woven fabric according to claim 11, wherein the multifilament yarn has a twist number of 0 to 1500 turns/meter. 13. The flat multifilament yarn woven fabric as claimed in claim 11, characterized in that, it has a certain anti-see-through degree of the woven fabric, and in the L*a*b* color system, the anti-perspective degree of the woven fabric is equal to or greater than The difference ΔL means that the difference ΔL is between 10 and 15, where the difference ΔL is the value of L* expressed as L* _W for the woven fabric placed on the white board and expressed as L* _b for the woven fabric placed on the blackboard The difference between the L* values. 14. The flat multifilament yarn woven fabric according to claim 11, which has a water absorption speed of 40 mm to 70 mm, which is determined by the Byreck method according to JIS L _1096-1998 , 6.26.1, (2). 15. The flat multifilament yarn woven fabric as claimed in claim 1, wherein the artificial monofilament of the multifilament yarn comprises a delustering agent in a mass content of 0 to 0.2%, and the cover factor of the woven fabric is in the range of 800 to 2000 range. 16. The flat multifilament yarn woven fabric according to claim 15, wherein the multifilament yarn has a twist number of 0 to 1000 turns/meter. 17. The flat multifilament yarn woven fabric as claimed in claim 15, characterized in that, under the illuminance of 100000 Lx, it has a light transmittance of 10 to 70%, which according to JIS _L1055-1987 , 6.1, utilizes Frazir type The testing machine is confirmed. 18. A low air permeability textile material comprising a flat multifilament yarn woven fabric as claimed in any one of claims 6 to 10. 19. A see-through sweat-absorbent textile material comprising a flat multifilament yarn woven fabric as claimed in any one of claims 11 to 14. 20. A see-through anti-textile material comprising a flat multifilament yarn woven fabric as claimed in any one of claims 15 to 17.

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