Textile

Abstract

To provide a textile having a further improved wavelength selective transmitting function.SOLUTION: A textile consists of: a tape-like yarn which has thermoplastic resin as a main component, and in which a value obtained by subtracting infrared transmittance from visible light transmittance is 35% or more; and a monofilament which has thermoplastic resin as a main component, and in which average transmittance at a wavelength 400 to 2500nm is 70% or more, where an intersection point of the tape-like yarn and the monofilament is fixed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to textile fabrics. [Background technology]

[0002] In agriculture, there is a problem of poor growth of agricultural crops and reduced productivity due to deterioration in quality caused by high temperatures in summer. In horticultural greenhouses (hereinafter sometimes referred to as greenhouses), the temperature inside the greenhouse rises, and the risk of workers suffering from sunstroke or heat stroke is increasing year by year due to the recent rise in temperature caused by climate change. To address these issues, the conventional approach has been to cover the outside of the greenhouse with a sunshade sheet to suppress the rise in temperature inside the greenhouse caused by sunlight.

[0003] However, when covering a greenhouse with a sunshade sheet, while infrared rays that cause heat are blocked, there is a trade-off issue in that visible light necessary for crop growth is also blocked.

[0004] In response to the above-mentioned problems, a woven fabric is known as a sunshade sheet, which uses tape-shaped yarns containing tungsten oxide microparticles with infrared shielding function as at least one of the warp and weft threads, and in which the total exposed area of ​​the tape-shaped yarns accounts for 50% or more of the unit area of ​​the fabric (see Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2022-59582 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the woven fabric described in Patent Document 1, in which a tape-shaped yarn containing tungsten oxide microparticles having an infrared shielding function and a monofilament are woven together, there is an intersection between the tape-shaped yarn and the monofilament, but the tape-shaped yarn and the monofilament are not fixed at this intersection. As a result, a space (i.e., an air layer) exists between the tape-shaped yarn and the monofilament at the intersection, and reflection occurs at the interface between the tape-shaped yarn and the air layer, reducing not only the infrared transmittance but also the visible light transmittance, resulting in a problem that the wavelength selective transmission function is insufficient depending on the type of agricultural crop grown in the greenhouse.

[0007] Here, the wavelength selective transmission function means the ability to transmit a large amount of visible light and block a large amount of infrared light, and the wavelength selective transmission function is a value obtained by subtracting the infrared transmittance (the arithmetic mean value of the transmittance of light with a wavelength of 781 to 2500 nm) from the visible light transmittance (the arithmetic mean value of the transmittance of light with a wavelength of 400 to 780 nm), and the larger the value, the better. Therefore, the larger the value, the more preferable it is as an agricultural sunshade sheet.

[0008] Furthermore, even if yarn with excellent wavelength selective transmission function is used in the woven fabric described in Patent Document 1, there is a problem in that the wavelength selective transmission function of the woven fabric is reduced.

[0009] In view of the above problems, an object of the present invention is to provide a woven fabric having a further improved wavelength selective transmission function. [Means for solving the problem]

[0010] In order to solve the above problems, the woven fabric of the present invention is as follows. That is, (1) Thermoplastic resin as the main component A tape-like yarn having a visible light transmittance minus infrared light transmittance of 35% or more; The main component is thermoplastic resin. It is made of monofilament with an average transmittance of 70% or more for wavelengths of 400 to 2500 nm. A woven fabric characterized in that the intersections of the tape-like yarn and the monofilament are fixed, Also, (2) the fabric has a plurality of through holes, When the optical aperture ratio is defined as the sum of the area of ​​the through holes and the area of ​​the monofilaments not intersecting with the tape-like yarn divided by the area of ​​the woven fabric, The woven fabric according to (1) is preferably characterized in that the optical aperture ratio is 1 to 15%. Also, (3) the fabric has a plurality of through holes, When the area of ​​the through holes is divided by the area of ​​the fabric, the ventilation opening rate is defined as the percentage. The numerical value (percentage) obtained by dividing the ventilation aperture ratio by the optical aperture ratio is 75 to 95%. It is preferable that the fabric is the fabric described in (1) or (2). Also, (4) a portion exposed on the first surface of the monofilament fabric, a first flatness at a portion fixed to the tape-like yarn; a portion of the monofilament fabric exposed on a second surface thereof; and The second flatness of the portion fixed to the tape-like yarn is The larger flatness value divided by the smaller flatness value is 1.5 to 5.0. It is preferable that the woven fabric is the fabric described in any one of (1) to (3), characterized in that: Effect of the Invention

[0011] According to the present invention, it is possible to provide a woven fabric having an improved wavelength selective transmission function. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic diagram showing an example of a woven fabric according to the present invention. [Diagram 2]2 is a schematic diagram of a cross section of a second woven fabric other than the woven fabric shown in FIG. 1 at the same positions as A and A' of the woven fabric shown in FIG. [Diagram 3] 2 is a conceptual diagram of cross sections of the woven fabric shown in FIG. 1 at A and A'. [Figure 4] 1. FIG. 2 is a conceptual diagram of a cross section of a third woven fabric other than the woven fabric shown in FIG. 1, taken at the same positions as A and A' of the woven fabric shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described in detail with reference to Fig. 1. Fig. 1 is a schematic diagram showing an example of a woven fabric according to the present invention.

[0014] The woven fabric 1 of the present invention is composed of a tape-shaped yarn 2 and a monofilament 3. The tape-shaped yarn 2 contains a thermoplastic resin as a main component, and the value obtained by subtracting the infrared transmittance from the visible light transmittance of the tape-shaped yarn is 35% or more. The monofilament 3 contains a thermoplastic resin as a main component, and the monofilament has an average transmittance of 70% or more for wavelengths of 400 to 2500 nm. The intersection of the tape-shaped yarn 2 and the monofilament 3 is fixed.

[0015] The woven fabric of the present invention, which has all of these characteristics, has excellent wavelength selective transmission function. Next, the mechanism by which the woven fabric of the present invention has excellent wavelength selective transmission function is presumed to be as follows. That is, the woven fabric of the present invention has an intersection between a tape-shaped yarn 1 having a characteristic that the value obtained by subtracting infrared transmittance from visible light transmittance is 35% or more (hereinafter, characteristic 1) and a monofilament 2 having a characteristic that the average transmittance at wavelengths of 400 to 2500 nm is 70% or more (hereinafter, characteristic 2), and also has a characteristic that the tape-shaped yarn and the monofilament are fixed at this intersection (hereinafter, characteristic 3). Although the details will be described later, at this intersection, the tape-shaped yarn and the monofilament overlap, but due to characteristics 1 and 2, most of the visible light that would pass through the intersection passes through the intersection, and most of the infrared light that would pass through the intersection is blocked at the intersection. Furthermore, at the intersection, the tape-shaped yarn and the monofilament are fixed, and there is no space between the tape-shaped yarn and the monofilament, which results in good wavelength selective transmission function at the intersection, and as a result, the wavelength selective transmission function of the woven fabric of the present invention is also good.

[0016] More specifically, the woven fabric 1 of the present invention is composed of a tape-like yarn 2 and a monofilament 3, and in this woven fabric 1, there are parts where the tape-like yarn 2 and the monofilament 3 overlap, and parts where the tape-like yarn 2 and the monofilament 3 do not overlap. In addition, in the woven fabric of the present invention, there are parts where neither the tape-like yarn 2 nor the monofilament 3 exists, that is, openings. Here, the parts where the tape-like yarn 2 and the monofilament 3 overlap are the intersections of the tape-like yarn 2 and the monofilament 3. At these intersections, the tape-like yarn and the monofilament are fixed, so that the mesh is less likely to shift, and the gaps between the tape-like yarn or the monofilament and the woven fabric are smaller. Then, when the woven fabric of the present invention is covered in a house, burrs or protrusions on the surface of the house are less likely to get caught in the above-mentioned gaps, and the dynamic friction coefficient is smaller. A small dynamic friction coefficient is preferable because it can be slid with a small force when covering the house, and fine adjustment of the position is easy. In addition, the above-mentioned openings are through holes, and the presence of these openings makes the breathability of the woven fabric of the present invention excellent. If the woven fabric has excellent breathability, when the woven fabric of the present invention is used as a sunshade sheet to cover a greenhouse with the woven fabric, it is possible to prevent air that has become hot due to solar radiation from remaining between the greenhouse and the fabric, and as a result, it is possible to suppress the temperature rise of the greenhouse, which is preferable.

[0017] When a light ray passes through the woven fabric of the present invention substantially perpendicularly, the light ray passes through one of the following four regions: first, region (I) region 4 where there is only tape-shaped yarn, second, region (II) region 5 where there is only monofilament, third, region (III) region 6 where the tape-shaped yarn and monofilament intersect, and fourth, region (IV) region 7 where there is neither tape-shaped yarn nor monofilament, i.e., an opening. Of these regions, the two regions that exhibit the wavelength selective transmission function are region (I) and region (III), and the higher the ratio of the total area of ​​region (I) and region (III) to the total area of ​​the woven fabric, the more improved the wavelength selective transmission function of the woven fabric is, which is preferable.

[0018] Here, if the tape-like yarn and the monofilament are fixed at their intersections by a method such as fusion or adhesion, the space between the tape-like yarn and the monofilament, i.e., the air layer, can be eliminated and they can be integrated. If an air layer exists, the reflection occurring at the interface between the tape-like yarn and the air layer and the interface between the monofilament and the air layer does not exhibit the wavelength selective transmission function, and the wavelength selective transmission function of the woven fabric is reduced.

[0019] The mechanism by which the wavelength selective transmission function of the woven fabric is reduced due to the presence of an air layer between the tape-shaped yarn and the monofilament is assumed to be as follows. When the light source, tape-shaped yarn, air layer, monofilament, and observer are positioned in this order, at the time when the light from the light source (this light is assumed to be sunlight containing at least infrared light and visible light) passes through the tape-shaped yarn, most of the visible light passes through and most of the infrared light is blocked due to the wavelength selective transmission function of the tape-shaped yarn. Next, a certain ratio of the light that has passed through the tape-shaped yarn is reflected at the interface between the air layer and the monofilament, regardless of the wavelength. Next, the light that has passed through the interface between the air layer and the monofilament reaches the monofilament, but the monofilament does not absorb either visible light or infrared light, or if it does absorb, it is only a very small amount. Then, the light that has passed through the monofilament reaches the observer.

[0020] A specific example of the above is given below. In the case of the above region (III) of a fabric in which a light source, a tape-like yarn, an air layer, a monofilament, and an observer are arranged in this order, the ratio of the amount of visible light after passing through the tape-like yarn to the total amount of visible light before passing through the tape-like yarn is 100% (hereinafter, abbreviated to the ratio of visible light) is 64%, the ratio of the amount of infrared light after passing through the tape-like yarn to the total amount of infrared light before passing through the tape-like yarn is 100% (hereinafter, abbreviated to the ratio of infrared light) is 18%, and the wavelength selective transmission function of the tape-like yarn is 46%. Next, when 10% of both visible light and infrared light are reflected at the interface between the air layer and the monofilament, the ratio of visible light passing through the interface is 57.6%, and the ratio of infrared light passing through the interface is 16.2%. Furthermore, if neither visible nor infrared light is absorbed by the monofilament, the ratio of visible light reaching the observer (i.e., transmitting through the above region (III) of the fabric) is 57.6%, and the ratio of infrared light is 16.2%. In this case, the wavelength selective transmission function of the above region (III) of the fabric is 41.4%.

[0021] On the other hand, in the case of the above-mentioned region (III) of the fabric where there is no air layer between the tape-like yarn and the monofilament, that is, the above-mentioned region (III) of the fabric where the light source, the tape-like yarn, the monofilament and the observer are arranged in this order, when the ratio of visible light transmitted through the tape-like yarn is 64% and the ratio of infrared light transmitted through the tape-like yarn is 18%, the wavelength selective transmission function of the tape-like yarn is 46%. Next, the transmitted visible light and infrared light are transmitted through the fixed part (i.e., the interface) between the tape-like yarn and the monofilament, where neither the visible light nor the infrared light is reflected, or even if it is reflected, it is very small. When the reflection of the visible light and the infrared light does not occur at the fixed part, the ratio of the visible light and the infrared light that reach the monofilament is 64% and 18%, respectively, and when the visible light and the infrared light are not absorbed by the monofilament, the ratio of the visible light that reaches the observer (i.e., transmitted through the above-mentioned region (III) of the fabric) is 64%, and the ratio of the infrared light is 18%. In this case, the wavelength selective transmission function of the above region (III) of the fabric is 46%.

[0022] Therefore, the wavelength selective transmission function of the region (III) of the fabric without an air layer is 46%, which is higher than the wavelength selective transmission function of the region (III) of the fabric with an air layer, which is 41.4%, and it is found that the wavelength selective transmission function of the region (III) of the fabric without an air layer is excellent. Since the region (III), which is one of the multiple regions constituting the fabric, has an excellent wavelength selective transmission function, the fabric as a whole also has an excellent wavelength selective transmission function.

[0023] Strictly speaking, even when the tape-like yarn and the monofilament are fixed together, there is a fused surface between the tape-like yarn and the monofilament, and when an adhesive or pressure-sensitive adhesive is used for fixing, there is an interface between the tape-like yarn etc. and the adhesive etc.; however, in either case, it is an interface between substances whose main component is resin, and the difference in refractive index between them is significantly smaller than the difference in refractive index between the resin and the air layer, and reflection at the interface is significantly reduced.

[0024] Next, the tape-shaped yarn contained in the woven fabric of the present invention will be described. This tape-shaped yarn contains a thermoplastic resin as a main component.

[0025] Here, the term "contains a thermoplastic resin as a main component" means that the thermoplastic resin is contained in an amount of more than 50% by mass relative to the entire tape-shaped yarn. Specifically, the thermoplastic resin may be any thermoplastic resin, such as polyolefin, polyester, methacrylic acid ester, polycarbonate, or a mixture thereof. From the viewpoint of productivity, polyethylene, polypropylene, and polyethylene terephthalate are preferred.

[0026] In this tape-shaped yarn, the value obtained by subtracting the infrared transmittance from the visible light transmittance is 35% or more. Here, the higher the value obtained by subtracting the infrared transmittance from the visible light transmittance, the more visible light the tape-shaped yarn transmits and the more infrared rays it blocks. Therefore, it can be said that the higher the value obtained by subtracting the infrared transmittance from the visible light transmittance of a tape-shaped yarn, the more suitable it is for a woven fabric to be used in a sunshade sheet. One method for making the value obtained by subtracting the infrared transmittance from the visible light transmittance of the tape-shaped yarn 35% or more is to add an infrared shielding agent to the tape-shaped yarn.

[0027] Examples of the infrared shielding agent include inorganic compounds such as tungsten oxide, antimony oxide, and indium oxide, and organic compounds such as cyanine dye, phthalocyanine dye, naphthalocyanine compound, nickel dithiolein complex, and azo compound. The infrared shielding agent dispersed in a thermoplastic resin has a feature that the visible light transmittance is higher than the infrared transmittance. From the viewpoint of weather resistance, the infrared shielding agent is preferably an inorganic compound, and more preferably tungsten oxide because it has excellent ability to shield infrared rays of 800 to 1200 nm, which are abundant in sunlight, and more preferably cesium tungsten oxide among tungsten oxides from the above viewpoint.

[0028] When the tape-shaped yarn contains an infrared shielding agent, the basis weight of the infrared shielding agent in the tape-shaped yarn is determined depending on the intended visible light transmittance and infrared transmittance. From the viewpoint of excellent wavelength selective transmission function, the basis weight is preferably 0.5 to 2.5 g / m 2 It is preferable that the thickness is within the range of 1.0 to 2.0 g / m 2 and more preferably 1.3 to 1.8 g / m 2 It is.

[0029] The thickness of the tape-shaped yarn is preferably 20 to 100 μm, more preferably 25 to 80 μm, and even more preferably 30 to 60 μm. By making the thickness 20 μm or more, the tensile strength in the direction parallel to the longitudinal direction of the tape-shaped yarn can be increased. By making the thickness 100 μm or less, the woven fabric can be made lightweight.

[0030] The width of the tape-shaped yarn is preferably 1.0 to 20.0 mm. More preferably, it is 2.0 to 10.0 mm, and even more preferably, it is 2.5 to 8.0 mm. By making the width of the tape-shaped yarn 1.0 mm or more, the number of threads can be reduced, and the productivity can be increased. In addition, the tape-shaped yarn becomes flat, and twisting of the threads during weaving can be suppressed. By making the width of the tape-shaped yarn 20.0 mm or less, the tape-shaped yarn can be easily applied to a general-purpose loom instead of a special loom.

[0031] The tape-like yarn is preferably a three-layer laminate consisting of a fixing layer, a base layer, and a fixing layer laminated in this order, since the fixing of the intersection of the tape-like yarn and the monofilament is stronger and the occurrence of floating and void inclusion can be suppressed. If floating or void inclusion occurs, an air layer is present for the light passing through the woven fabric in a substantially perpendicular direction, which may reduce the wavelength selective transmission function of the woven fabric. The fixing layer is a layer having a function of fixing the contact portion (intersection) of the tape-like yarn and the monofilament, and as the material thereof, low-melting point thermoplastic resins such as low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE), various adhesives such as acrylic, silicone, and epoxy, and various pressure-sensitive adhesives such as acrylic, silicone, urethane, and rubber can be used. Among these, it is more preferable to use low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), or a mixture thereof for the fixing layer of the tape-like yarn, from the viewpoints that the fixing layer and the base layer can be simultaneously produced by co-extrusion, there is no room temperature tackiness, and a protective film is not required.

[0032] The base material layer is a layer that functions as a base material when an infrared shielding agent is contained and that provides mechanical strength to the tape-shaped yarn, and can be made of materials such as high-density polyethylene, polypropylene, and polyvinyl chloride.

[0033] The ratio of the thickness of the fixing layer, the base layer, and the fixing layer is preferably 1:98 to 25:50, more preferably 5:90 to 15:70, for the fixing layer on one side to the base layer. By making the fixing layer 5% or more, the fixation of the tape-like yarn and the monofilament can be strengthened, and floating and void bite can be reduced. In addition, by making the base layer, which is more rigid than the fixing layer, 40% or more, deformation of the tape-like yarn can be suppressed. In addition, the ratio of the thickness of the fixing layer on the other side to the base layer is also preferably within the above range. In addition, the ratio of the thickness of the fixing layer on one side to the base layer and the ratio of the thickness of the fixing layer on the other side to the base layer may be the same or different.

[0034] The monofilament contained in the woven fabric of the present invention will now be described. This monofilament contains a thermoplastic resin as a main component.

[0035] Here, "containing as a main component" means that the monofilament contains a thermoplastic resin in an amount exceeding 50% by mass. Specifically, any thermoplastic resin such as polyolefin, polyester, methacrylic acid ester, polycarbonate, or a mixture thereof can be used as the thermoplastic resin. From the viewpoint of productivity, polyethylene, polypropylene, and polyethylene terephthalate are preferred.

[0036] The diameter of the monofilament is preferably 0.1 to 1.0 mm. By making the diameter 0.1 mm or more, the tensile strength in the direction parallel to the monofilament can be increased, and the thickness (diameter) of the monofilament thread can be used to generate three-dimensional gaps and surface irregularities in the woven fabric. The three-dimensional gaps in the woven fabric can be expected to provide a passage for air that has become hot due to sunlight, thereby cooling the house, and discharging moisture when condensation occurs due to environmental changes. In addition, the unevenness of the woven fabric can limit the contact area between the woven fabric and the ceiling or wall surface of the house when covering the house, and is preferable because it can suppress adhesion due to dirt. By making the diameter of the monofilament 1.0 mm or less, the stiffness (bending resistance) of the filament can be limited, making it easy to fold the woven fabric.

[0037] In addition, it is preferable that the monofilament has a core-sheath structure with the fixing layer as the sheath and the base layer as the core, since the fixation of the intersection of the tape-like yarn and the monofilament is stronger and the occurrence of floating and void bite can be suppressed. If there is floating or void bite, an air layer will be present for the light passing through the woven fabric in a substantially perpendicular direction, which may reduce the wavelength selective transmission function of the woven fabric. The fixing layer is a layer that has the function of fixing the contact portion (intersection) of the tape-like yarn and the monofilament, and the fixing layer can be made of low-melting thermoplastic resins such as low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE), various adhesives such as acrylic, silicone, and epoxy, and various pressure-sensitive adhesives such as acrylic, silicone, urethane, and rubber. Among these, it is more preferable to use low-density polyethylene (LDPE) or linear low-density polyethylene (LLDPE) or a mixture thereof, which is fixed by heat fusion, from the viewpoints that the fixing layer and the base layer can be simultaneously produced by co-extrusion, and that there is no tackiness at room temperature and it is easy to handle.

[0038] The base material layer is a layer that functions as a base material when an infrared shielding agent is contained and that provides the mechanical strength of the monofilament. Materials that can be used for this layer include high-density polyethylene, polypropylene, and polyvinyl chloride. When the monofilament has a core-sheath structure with the fixing layer as the sheath and the base layer as the core, the ratio of the cross-sectional area of ​​the fixing layer to the cross section of the monofilament is preferably 1 to 50%, more preferably 5 to 15%. When this ratio is 1% or more, the tape-like yarn and the monofilament are firmly fixed, and floating and void bite can be reduced. When this ratio is 50% or less, the content of the base layer in the monofilament is relatively high, and since this base layer is rigid, the tensile strength in the direction parallel to the longitudinal direction of the monofilament is high, and as a result, the strength of the woven fabric of the present invention is superior. The cross-sectional shape of the monofilament is not particularly limited to a circle, an ellipse, a rectangle, a star, a Y-shape, etc., but a circle is preferable because it is easy to manufacture and maintain the spinneret.

[0039] The woven fabric of the present invention may be made of either a tape-like yarn as the warp and a monofilament as the weft, or a tape-like yarn as the weft and a monofilament as the weft. Using the tape-like yarn as the warp is preferred because the tape-like yarn is less likely to be twisted or broken.

[0040] The fabric of the present invention can be woven by any known method such as plain weave, twill weave, satin weave, leno weave, etc., but plain weave is preferred from the viewpoint of effectively generating surface irregularities due to the thickness of the monofilament.

[0041] The woven fabric of the present invention has a plurality of through holes, and the optical aperture ratio is defined as the total area of ​​the through holes and the area of ​​the monofilaments not intersecting with the tape-like yarn divided by the area of ​​the woven fabric. The optical aperture ratio is preferably 1 to 15%. To explain in detail with reference to FIG. 1, the optical aperture ratio can be calculated by dividing the total area of ​​the region (II) indicated by the reference number 5 in FIG. 1 and the region (IV) indicated by the reference number 7 in FIG. 1 by the total area of ​​the region (I) indicated by the reference number 4 in FIG. 1, the region (II) indicated by the reference number 5 in FIG. 1, the region (III) indicated by the reference number 6 in FIG. 1, and the region (IV) indicated by the reference number 7 in FIG. 1, and multiplying the result by 100. The optical aperture ratio is more preferably 2 to 13%, and even more preferably 3 to 10%. The smaller the optical aperture ratio, the smaller the ratio of the total area of ​​the region (II) and the region (IV) to the total area of ​​the woven fabric. On the other hand, the ratio of the total area of ​​the region (I) and the region (III) to the total area of ​​the woven fabric increases. Here, the region (II) and the region (IV) do not have the wavelength selective transmission function, but the region (I) and the region (III) have the wavelength selective transmission function, so that the smaller the optical aperture ratio, the better the wavelength selective transmission function of the entire woven fabric. From the above, by setting the optical aperture ratio to 15% or less, the wavelength selective transmission function of the woven fabric is excellent. It is presumed that this effect is obtained because the tape-like yarn having the wavelength selective transmission function occupies a large area of ​​the woven fabric, and the woven fabric can shield a large amount of infrared rays. If the optical aperture ratio is less than 1%, the area of ​​the through hole becomes small, and it may be difficult to discharge the heated air and moisture between the house and the sunshade sheet. As a means for setting the optical aperture ratio to 1 to 15%, the width and the number of threads of the tape-like yarn and the monofilament are set to an appropriate range, and the weaving method of the woven fabric is set to a plain weave, and the intersection of the tape-like yarn and the monofilament is heat-sealed.

[0042] In the woven fabric of the present invention, the woven fabric has a plurality of openings, i.e., through holes, and when the value (percentage) obtained by dividing the area value of the through holes by the area value of the woven fabric is defined as the ventilation aperture ratio, the value obtained by dividing the ventilation aperture ratio by the optical aperture ratio is preferably 75 to 95%. To explain specifically with reference to Fig. 1, the ventilation aperture ratio can be calculated by multiplying the value obtained by dividing the area of ​​region (IV) indicated by reference number 7 in Fig. 1 by the total area of ​​region (I) indicated by reference number 4 in Fig. 1, region (II) indicated by reference number 5 in Fig. 1, region (III) indicated by reference number 6 in Fig. 1, and region (IV) indicated by reference number 7 in Fig. 1 by 100.

[0043] When the numerical value (percentage) obtained by dividing the ventilation aperture rate by the optical aperture rate is 75% or more, the breathability of the woven fabric of the present invention is superior, whereas when the numerical value (percentage) obtained by dividing the ventilation aperture rate by the optical aperture rate is 95% or less, the strength of the woven fabric of the present invention is superior.

[0044] Methods for setting the ventilation opening rate divided by the optical opening rate (percentage) to 75 to 95% include using narrow monofilaments or reducing the number of monofilaments woven, within the range where the necessary strength of the woven fabric can be maintained.

[0045] The woven fabric of the present invention is characterized by having a high wavelength selective transmission function while having the minimum necessary air permeability. The exposed area of ​​the monofilament in the woven fabric that does not contribute to any of these and does not form an intersection with the tape-shaped yarn is preferably small. It is preferable that the value (percentage) obtained by dividing the ventilation aperture rate by the optical aperture rate is in the range of 75 to 95%, since it is possible to enhance the wavelength selective transmission function while maintaining the minimum necessary air permeability. In order to ensure sufficient strength of the woven fabric in the direction parallel to the longitudinal direction of the monofilament, the monofilament must be present with a certain thickness or more and with a certain number of threads or more, and as a result, the monofilament occupies a certain area. Therefore, it is preferable that the value (percentage) obtained by dividing the ventilation aperture rate of the monofilament by the optical aperture rate is 95% or less.

[0046] The woven fabric of the present invention may be provided with functions such as anti-fog agent, antifouling agent, repellent, insect repellent, antibacterial agent, etc., by post-processing, within the range that does not impair the effects of the present invention. Examples of the method for providing the functions include a dip-nip method and a spray method.

[0047] When the woven fabric of the present invention is expected to be used in an environment exposed to sunlight, such as outdoors as an agricultural sheet, it is preferable to impart an ultraviolet shielding agent or a light stabilizer to improve weather resistance. Examples of ultraviolet shielding agents include triazine derivatives and benzotriazole derivatives. Examples of light stabilizers include hindered amine derivatives. The ultraviolet shielding agent or light stabilizer may be imparted with the function by blending it inside the tape-shaped yarn or monofilament, or by post-processing.

[0048] The woven fabric of the present invention is a portion exposed on the first surface of the woven fabric of the monofilament, and a first flatness at a portion fixed to the tape-like yarn and a second flatness at a portion exposed to a second surface of the monofilament fabric and fixed to the tape-like yarn, the larger of the two being divided by the smaller of the two being 1.5 to 5.0; It is preferable that there is.

[0049] The structure of the woven fabric having the above value of 1.5 to 5.0 means, for example, the following. That is, when comparing the first flatness of the portion fixed to the monofilament tape-like yarn exposed on the first surface side of the woven fabric with the second flatness of the portion fixed to the monofilament tape-like yarn exposed on the second surface side of the woven fabric, the first flatness means a woven fabric in which the first flatness is 1.5 to 5.0 times the second flatness. Here, the larger the flatness of the monofilament, the closer its cross-sectional shape is to a rectangular shape, and the larger the dynamic friction coefficient between the surface of the woven fabric to which the monofilament with a larger flatness is exposed and other members is. When the woven fabric of the present invention is used for a sunshade sheet, the above other members are assumed to be materials constituting the ceiling or wall of the house.

[0050] Then, in the case of a woven fabric having the above value of 1.5 to 5.0, the kinetic friction coefficient of either the first surface of the woven fabric or the second surface of the woven fabric is large, and the kinetic friction coefficient of the other surface is smaller than the kinetic friction coefficient of the one surface. When such a woven fabric is used as a sunshade sheet, the following effects can be expected. When the sunshade sheet is installed on the house so that the surface of the woven fabric with a large kinetic friction coefficient contacts the house, the sunshade sheet can be prevented from slipping off the house. Conversely, when the sunshade sheet is installed on the house so that the surface of the woven fabric with a small kinetic friction coefficient contacts the house, it becomes easier to adjust the installation position of the sunshade sheet after placing it on the house. That is, the user of the sunshade sheet can select and obtain the desired effect from "prevention of slipping off" and "ease of adjustment of the installation position" by which surface of the woven fabric contacts the house.

[0051] In addition, the method for obtaining a woven fabric having the above value of 1.5 to 5.0 is not particularly limited, but the following can be mentioned. That is, in the woven fabric of the present invention, the flatness of the monofilament can be controlled by a method for fixing the intersection of the tape-like yarn and the monofilament. When the tape-like yarn and the monofilament are plain woven and then fused by applying pressure and heat from both the first and second sides with a hot roll, the monofilament that comes into contact with the hot roll is deformed flat (monofilaments 3A and 3B in FIG. 4). That is, the flatness of the monofilament can be increased. When the tape-like yarn and the monofilament are plain woven and then fused by heating with a hot air oven or an IR heater, the monofilament does not deform much (monofilaments 3A and 3B in FIG. 2). When the tape-like yarn and the monofilament are plain woven and then fused by applying pressure and heat only with a hot roll, only the monofilament on the second side that comes into contact with the hot roll is deformed flat (monofilament 3B in FIG. 3). That is, the flatness of the monofilament can be increased. Also, the monofilament on the first surface that does not contact the heated roll can be left largely undeformed (monofilament 3A in FIG. 3). As a method for pressurizing and heating only the second surface with the heated roll, there is a method in which the woven fabric is wrapped around the heated roll at a large wrap angle so that the second surface comes into contact with the heated roll, and tension is applied to the woven fabric.

[0052] FIG. 2 is a conceptual diagram of a cross section of a second woven fabric other than the woven fabric shown in FIG. 1 at the same sites A and A' as the woven fabric shown in FIG. 1. In this cross section, the flatness of the monofilament 3A exposed on the first surface side 8A of the woven fabric at the intersection between the monofilament and the tape-like yarn 2 is low. In addition, in this cross section, the flatness of the monofilament 3B exposed on the second surface side 8B of the woven fabric at the intersection between the monofilament and the tape-like yarn 2 is also low. Therefore, the dynamic friction coefficient between the two surfaces of the woven fabric and other members is low. In addition, this type of woven fabric tends to have the above value outside the range of 1.5 to 5.0.

[0053] Next, FIG. 3 is a conceptual diagram of the cross sections of the woven fabric shown in FIG. 1 at A and A'. In this cross section, the flatness of the monofilament 3A exposed on the first surface side 8A of the woven fabric at the intersection between the monofilament and the tape-like yarn 2 is low. On the other hand, in this cross section, the flatness of the monofilament 3B exposed on the second surface side 8B of the woven fabric at the intersection between the monofilament and the tape-like yarn 2 is high. Therefore, the dynamic friction coefficient between the first surface of the woven fabric and other members is low, and the dynamic friction coefficient between the second surface of the woven fabric and other members is high. In addition, this type of woven fabric tends to have the above value within the range of 1.5 to 5.0.

[0054] Finally, FIG. 4 is a conceptual diagram of a cross section of a third woven fabric other than the woven fabric shown in FIG. 1 at the same sites A and A' as the woven fabric shown in FIG. 1. In this cross section, the flatness of the monofilament 3A exposed on the first surface side 8A of the woven fabric is high at the intersection between the monofilament and the tape-like yarn 2. In addition, in this cross section, the flatness of the monofilament 3B exposed on the second surface side 8B of the woven fabric is also high at the intersection between the monofilament and the tape-like yarn 2. Therefore, the dynamic friction coefficient between the two surfaces of the woven fabric and other members is high. In addition, this type of woven fabric tends to have the above value outside the range of 1.5 to 5.0.

[0055] The woven fabric of the present invention, which has excellent wavelength selective transmission function, preferably also has necessary and sufficient breathability.Moreover, the woven fabric of the present invention preferably has a function of being able to select between the above-mentioned effects of "suppression of slipping down" and "ease of adjustment of installation position" by having one side with a high dynamic friction coefficient and the other side with a low dynamic friction coefficient.

[0056] It is more preferable that the woven fabric of the present invention, which has excellent wavelength selective transmission function, further has sufficient breathability and further has the function of being able to select the effects of "suppression of slipping down" and "ease of adjusting the installation position" described above.

[0057] The woven fabric of the present invention is also suitable for use as a sunshade sheet, awning, shade, interior curtain, blind, etc. Here, these may contain sheet-like materials other than the woven fabric of the present invention, etc., within the scope that does not impair the effects of the woven fabric of the present invention. Specifically, when the woven fabric of the present invention is applied to an object to be applied, such as an agricultural greenhouse, and the width or length of the woven fabric is insufficient, the woven fabric may be integrated with a sheet-like material other than the above-mentioned woven fabric by sewing. EXAMPLES

[0058] The present invention will be described in detail below with reference to examples, but the present invention is not limited to these. The performances in the examples were measured by the following methods.

[0059] [Measurement method] (1) Visible light transmittance and infrared transmittance of tape-shaped yarn Five tape-like yarn test pieces, including parts that do not intersect with the monofilament, were randomly taken from the woven fabric. Using a microscopic ultraviolet-visible-near infrared spectrophotometer "MSV-5200DGK (manufactured by JASCO Corporation)", the transmittance of light in the wavelength range of 400 to 2500 nm was measured on one side and the other side of the test piece for the parts that do not intersect with the monofilament of the tape-like yarn. The average value of the transmittance of 10 pieces in the wavelength range of 400 to 780 nm on one side and the other side was taken as the visible light transmittance (%), and the average value of the transmittance in the wavelength range of 781 to 2500 nm was taken as the infrared transmittance (%). The measurement aperture diameter was 100 μm, and the sampling interval was 1 nm.

[0060] (2) Average transmittance of monofilament at wavelengths of 400 to 2500 nm Five monofilament test pieces, including parts that do not intersect with the tape-like yarn, were randomly taken from the woven fabric. Using a microscopic ultraviolet-visible-near infrared spectrophotometer "MSV-5200DGK (manufactured by JASCO Corporation)", the transmittance of light in the wavelength range of 400 to 2500 nm was measured on one side and the other side of the test piece for the parts that do not intersect with the tape-like yarn of the monofilament. The average value of the transmittance in the wavelength range of 400 to 2500 nm obtained on one side and the other side was taken as the average transmittance of the monofilament in the wavelength range of 400 to 2500 nm. The measurement aperture diameter was 100 μm, and the sampling interval was 1 nm.

[0061] (3) Optical aperture ratio The optical aperture ratio was determined by observing the woven fabric with a Keyence Corporation VHX8000 microscope at an objective lens magnification of 25x from a direction perpendicular to the plane of the fabric, and using the area measurement function of the attached software, dividing the total area of ​​region (II) indicated by reference number 5 in Figure 1 and region (IV) indicated by reference number 7 in Figure 1 by the total area of ​​region (I) indicated by reference number 4 in Figure 1 and region (II) indicated by reference number 5 in Figure 1 and region (III) indicated by reference number 6 in Figure 1 and region (IV) indicated by reference number 7 in Figure 1, and multiplying the value obtained by 100. Ten points were randomly sampled from the fabric, and the above measurements were performed, and the average value was determined as the optical aperture ratio.

[0062] (4) Ventilation opening rate The optical aperture ratio can be determined by observing the woven fabric with a Keyence Corporation VHX8000 microscope at an objective lens magnification of 25x from a direction perpendicular to the plane of the fabric, and using the area measurement function of the attached software, dividing the area of ​​region (IV) indicated by reference number 7 in Fig. 1 by the total area of ​​region (I) indicated by reference number 4 in Fig. 1, region (II) indicated by reference number 5 in Fig. 1, region (III) indicated by reference number 6 in Fig. 1, and region (IV) indicated by reference number 7 in Fig. 1, and multiplying the value obtained by this by 100. Ten points were randomly sampled from the fabric, and the above measurements were performed, and the average value was taken as the optical aperture ratio.

[0063] (5) Width and thickness of tape-like yarn and monofilament The tape-like yarn and monofilament were cut perpendicular to the longitudinal direction at positions that did not form intersections with a single-edged razor, and the cross section was observed perpendicular to the cross section with a Keyence Corporation VHX8000 microscope at an objective lens magnification of 25. The lengths were measured at 10 random locations using the attached software, and the average values ​​were used as the width and thickness of the tape-like yarn or monofilament.

[0064] (6) Flatness of the monofilament at the intersection of the tape-like yarn and the monofilament Observation was performed using a VHX8000 microscope manufactured by Keyence Corporation, and the cross section of the monofilament at the intersection of the tape-like yarn and the monofilament was observed at an objective lens magnification of 25 times, and the flatness was calculated using the following formula (length in the major axis direction D / length in the minor axis direction d): The above operation was performed at 10 points randomly selected from the woven fabric, and the average of the 10 values ​​obtained was taken as the flatness of the monofilament at the intersection of the tape-like yarn and the monofilament. Flatness=D / d (7) Coefficient of kinetic friction Ten rectangular samples, 70 mm wide and 150 mm long, were cut from the fabric at random positions and angles. The surface of the agricultural polyolefin film (Clintate EX manufactured by Santerra Co., Ltd.) that is instructed to be the outer surface when laid out in a greenhouse was used as the mating material, and measurements were made according to the method of JIS K7125 (1999), except that the total mass of the sliding piece was set to 500 g. The average value of the 10 measurements was taken as the dynamic friction coefficient.

[0065] [Example 1] (Tape-like yarn) High-density polyethylene resin chips (E8040 manufactured by Keiyo Polyethylene Co., Ltd.) and a powder in which cesium tungsten oxide was dispersed as tungsten oxide fine particles (YMDS-874 manufactured by Sumitomo Metal Mining Co., Ltd., cesium tungsten oxide concentration 23% by mass) were kneaded and chipped in a compounding ratio of 43.5:56.5 to prepare a master chip.

[0066] In a three-layered coextrusion process, the master chip was diluted with high-density polyethylene resin chips (E8040 manufactured by Keiyo Polyethylene Co., Ltd.) to make a substrate layer containing 2.9% by mass of cesium tungsten oxide, and low-density polyethylene (Sumikathene F200 manufactured by Sumitomo Chemical Co., Ltd.) was arranged on both sides of the substrate layer as an anchoring layer to produce a film. At this time, the thickness ratio of the anchoring layer / substrate layer / anchoring layer was 1 / 8 / 1.

[0067] The film was then slit to a specified width, stretched 7 times on a 110°C hot plate, and heat-set at 120°C to obtain a tape-like yarn with a width of 3 mm and a thickness (total thickness of anchoring layer / base layer / anchoring layer) of 44 μm.

[0068] The wavelength selective transmission function of the tape-like yarn was 48.4%.

[0069] (Monofilament) In a spinning machine having a concentric core-sheath spinneret, a high-density polyethylene resin (E8040 manufactured by Keiyo Polyethylene Co., Ltd.) was used as the core, i.e., substrate layer, and a low-density polyethylene resin (Sumikasen F200 manufactured by Sumitomo Chemical Co., Ltd.) was used as the sheath, i.e., fixing layer, and a core-sheath structure monofilament was obtained at an extrusion temperature of 190°C, a stretching water tank temperature of 100°C, a heat setting temperature of 120°C, and a stretching ratio of 15 times. The extrusion amount was adjusted so that the area ratio of the core in the cross section when the monofilament was cut perpendicular to the longitudinal direction was 80% and the area ratio of the sheath was 20%. The average transmittance of the monofilament at wavelengths of 400 to 2500 nm was 89.9%, and the width and thickness were 0.29 mm.

[0070] (fabric) Using a rapier loom, the tape-like yarn was plain woven as the warp yarn at 8.0 yarns / 25.4 mm intervals and the monofilament was plain woven as the weft yarn at 16.0 yarns / 25.4 mm intervals, and then only one side of the weave was brought into contact with a heated roll having a surface temperature of 125°C to fix the intersections of the tape-like yarn and the monofilament by thermal fusion, thereby obtaining the woven fabric of Example 1.

[0071] The wavelength selective transmission function of the obtained fabric was 47.0%, the value obtained by subtracting the wavelength selective transmission function of the first yarn from the wavelength selective transmission function of the fabric was 1.4%, and the air permeability was 41cc / cm 2 / s, ventilation aperture ratio was 4.5%, optical aperture ratio was 5.5%, and the value obtained by dividing the ventilation aperture ratio by the optical aperture ratio was 82%. The flatness of the monofilaments on the first surface of the woven fabric was 2.2, and the flatness of the monofilaments on the second surface was 1.2, resulting in a flatness ratio of 1.9. The ratio of the dynamic friction coefficient of the first surface to the dynamic friction coefficient of the second surface was 1.21.

[0072] [Example 2] A woven fabric of Example 2 was obtained in the same manner as in Example 1, except that in the preparation of the tape-shaped yarn, the master chips were diluted with high-density polyethylene resin chips to form a base layer containing 0.9 mass % cesium tungsten oxide.

[0073] The structures and physical properties of the obtained tape-like yarn, monofilament and woven fabric are shown in Table 1.

[0074] [Example 3] High density polyethylene resin chips (E8040 manufactured by Keiyo Polyethylene Co., Ltd.) and titanium oxide fine particles (R-390 manufactured by Ishihara Sangyo Kaisha, Ltd.) were mixed and chipped in a ratio of 90:10 to prepare a master chip.

[0075] The woven fabric of Example 3 was obtained in the same manner as Example 1, except that in the monofilament production process, the master chips were diluted with high-density polyethylene resin chips (E8040 manufactured by Keiyo Polyethylene Co., Ltd.) to form the core so that the titanium oxide microparticles were 1.0 mass %.

[0076] The structures and physical properties of the obtained tape-like yarn, monofilament and woven fabric are shown in Table 1.

[0077] [Example 4] A woven fabric of Example 4 was obtained in the same manner as in Example 1, except that in the weaving process, the tape-like yarns of the warp were arranged at an interval of 8.2 yarns / 25.4 mm. The structures and physical properties of the obtained tape-like yarn, monofilament and woven fabric are shown in Table 1.

[0078] [Example 5] A woven fabric of Example 5 was obtained in the same manner as in Example 1, except that in the weaving process, the tape-like yarns of the warp were arranged at 7.5 yarns / 25.4 mm intervals.

[0079] The structures and physical properties of the obtained tape-like yarn, monofilament and woven fabric are shown in Table 1.

[0080] [Example 6] In the process of producing the tape-like yarn, the film after the three-layer co-extrusion was slit narrower than in Example 1, then stretched 7 times on a 110°C hot plate and heat-set at 120°C to obtain a tape-like yarn with a width of 2.8 mm and a thickness (total thickness of fixing layer / base layer / fixing layer) of 44 μm. Except for this, the fabric of Example 6 was obtained in the same manner as Example 1.

[0081] The structures and physical properties of the obtained tape-like yarn, monofilament and woven fabric are shown in Table 1.

[0082] [Example 7] In the process of producing the tape-like yarn, the film after the three-layer co-extrusion was slit narrower than in Example 1, then stretched 7 times on a 110°C hot plate and heat-set at 120°C to obtain a tape-like yarn with a width of 2.7 mm and a thickness (total thickness of fixing layer / base layer / fixing layer) of 44 μm. Except for this, the woven fabric of Example 7 was obtained in the same manner as in Example 1.

[0083] The structures and physical properties of the obtained tape-like yarn, monofilament and woven fabric are shown in Table 2.

[0084] [Example 8] In the monofilament production process, a monofilament having a width and thickness of 0.20 mm was obtained in the same manner as in Example 1, except that the diameter of the spinning machine nozzle was narrowed and the draw ratio was set to 20. Then, in the weaving process, a woven fabric of Example 8 was obtained in the same manner as in Example 1, except that the weft yarn pick count was set to 8 yarns / 25.4 mm interval.

[0085] The structures and physical properties of the obtained tape-like yarn, monofilament and woven fabric are shown in Table 2.

[0086] [Example 9] In the monofilament production process, a monofilament having a width and thickness of 0.50 mm was obtained in the same manner as in Example 1, except that the diameter of the spinning machine nozzle was increased and the draw ratio was set to 10. Then, in the weaving process, a woven fabric of Example 9 was obtained in the same manner as in Example 1, except that the weft yarn pick count was set to 12 / 25.4 mm interval.

[0087] The structures and physical properties of the obtained tape-like yarn, monofilament, and woven fabric are shown in Table 2. [Example 10] The woven fabric of Example 10 was obtained in the same manner as in Example 1, except that in the weaving process, the tape-like yarns of the warp were arranged at 22 threads / 25.4 mm intervals.

[0088] The structures and physical properties of the obtained tape-like yarn, monofilament and woven fabric are shown in Table 2.

[0089] [Example 11] A woven fabric of Example 11 was obtained in the same manner as in Example 9, except that in the weaving process, the tape-like yarns of the warp were arranged at 40 ends / 25.4 mm intervals.

[0090] The structures and physical properties of the obtained tape-like yarn, monofilament and woven fabric are shown in Table 2.

[0091] [Example 12] The woven fabric of Example 12 was obtained in the same manner as in Example 1, except that in the weaving process, the intersections were heat-fused by contacting both the first and second sides with heated rolls having a surface temperature of 125°C.

[0092] The structures and physical properties of the obtained tape-like yarn, monofilament and woven fabric are shown in Table 3.

[0093] [Example 13] The woven fabric of Example 13 was obtained in the same manner as in Example 1, except that in the weaving process, neither the first nor second sides were brought into contact with a heated roll, and the intersections were heat-sealed in a hot air oven at a temperature of 130°C.

[0094] The structures and physical properties of the obtained tape-like yarn, monofilament and woven fabric are shown in Table 3.

[0095] [Comparative Example 1] (First tape-like yarn) In the process of producing the tape-shaped yarn, the three-layer co-extruded film was slit narrower than in Example 1, then stretched 7 times on a 110°C hot plate and heat-fixed at 120°C to obtain a tape-shaped yarn with a width of 2.4 mm and a thickness (total thickness of fixing layer / base layer / fixing layer) of 44 μm.

[0096] (Second tape-like yarn) A three-layered co-extrusion film was produced with high-density polyethylene resin chips (E8040 manufactured by Keiyo Polyethylene Co., Ltd.) as the base layer and low-density polyethylene (Sumikasen F200 manufactured by Sumitomo Chemical Co., Ltd.) as the anchoring layers on both sides of the base layer. The thickness ratio of the anchoring layer / base layer / anchoring layer was 1 / 8 / 1.

[0097] The film was then slit to a specified width, stretched 7 times on a 110°C hot plate, and heat-set at 120°C to obtain a tape-shaped yarn with a width of 2.4 mm and a thickness (total thickness of anchoring layer / base layer / anchoring layer) of 44 μm.

[0098] (fabric) Using a rapier loom, the first tape-shaped yarn was plain woven as the warp yarn at 8.0 threads / 25.4 mm intervals and the second tape-shaped yarn was plain woven as the weft yarn at 8.0 threads / 25.4 mm intervals, and the intersections were heat-fused by contacting only one side with a heated roll with a surface temperature of 125°C to obtain the woven fabric of Comparative Example 1.

[0099] The structures and physical properties of the two types of tape-like yarn and woven fabric obtained are shown in Table 3. [Comparative Example 2] High density polyethylene resin chips (E8040 manufactured by Keiyo Polyethylene Co., Ltd.) and titanium oxide fine particles (R-390 manufactured by Ishihara Sangyo Kaisha, Ltd.) were mixed and chipped in a ratio of 90:10 to prepare a master chip.

[0100] The woven fabric of Comparative Example 2 was obtained in the same manner as Example 1, except that in the monofilament production process, the master chips were diluted with high-density polyethylene resin chips (E8040 manufactured by Keiyo Polyethylene Co., Ltd.) to form the core so that the titanium oxide microparticles were 4.2 mass%.

[0101] The structures and physical properties of the obtained tape-like yarn, monofilament and woven fabric are shown in Table 3.

[0102] [Comparative Example 3] The tape-like yarn and monofilament were produced in the same manner as in Example 1. In the weaving process, the tape-like yarn was woven as the warp yarn at 6.5 yarns / 25.4 mm intervals, and the monofilament was woven as the weft yarn at 16.0 yarns / 25.4 mm intervals, to obtain the tape-like yarn of Comparative Example 3.

[0103] The structures and physical properties of the obtained tape-like yarn, monofilament and woven fabric are shown in Table 3.

[0104] Comparing Example 1 with Comparative Example 1, which uses tape-shaped yarns instead of monofilaments for the weft, Example 1 has a better wavelength selective transmission function as a woven fabric. In particular, while Example 1 and Comparative Example 1 use the same warp threads, the value obtained by subtracting the wavelength selective transmission function of the warp threads from the wavelength selective transmission function of the woven fabric is better in Example 1, which shows that the decrease in wavelength selective transmission function during weaving is mitigated.

[0105] Comparing Example 1 with Comparative Example 2, in which a monofilament having an average transmittance of 10% for wavelengths of 400 to 2500 nm is used as the weft yarn, it is found that Example 1 is superior in wavelength selective transmission function and in terms of reduction in wavelength selective transmission function during weaving.

[0106] Comparing Example 1 with Comparative Example 3 in which the optical aperture ratio of the woven fabric is 23.2%, it is found that Example 1 is superior in wavelength selective transmission function and in reducing the decrease in wavelength selective transmission function when woven.

[0107] Example 1, in which only one side of the woven fabric before fixing the intersection of the tape-like yarn and the monofilament is brought into contact with the heating roll when fixing the intersection of the tape-like yarn and the monofilament, is compared with Example 12, in which both sides of the woven fabric before fixing the intersection are brought into contact with the heating roll when fixing the intersection of the tape-like yarn and the monofilament. In terms of the value obtained by dividing the larger flatness value of the first flatness at the portion exposed to the first side of the woven fabric of the monofilament and fixed to the tape-like yarn and the second flatness at the portion exposed to the second side of the woven fabric of the monofilament and fixed to the tape-like yarn by the smaller flatness value, the above value of the woven fabric of Example 1 is larger than the above value of Example 12. As a result, in the woven fabric of Example 1, the desired effect of "suppression of slipping" and "ease of adjustment of installation position" could be selected and obtained by selecting the surface that contacts the house when covering the house. On the other hand, the woven fabric of Example 12 did not obtain the above effect obtained with the woven fabric of Example 1.

[0108] Example 1, in which only one side of the woven fabric before fixing the intersection between the tape-like yarn and the monofilament is brought into contact with a heating roll when fixing the intersection between the tape-like yarn and the monofilament, is compared with Example 13, in which both sides of the woven fabric before fixing the intersection are not brought into contact with a heating roll, and instead the intersection is heat-fused in a hot air oven at a temperature of 130 ° C. When fixing the intersection between the tape-like yarn and the monofilament, the intersection is heat-fused in a hot air oven at a temperature of 130 ° C. The above value of the woven fabric of Example 1 is larger than the above value of Example 13 in terms of the value obtained by dividing the larger flatness value of the first flatness at the part exposed to the first side of the woven fabric of the monofilament and fixed to the tape-like yarn, and the second flatness at the part exposed to the second side of the woven fabric of the monofilament and fixed to the tape-like yarn, by the smaller flatness value. As a result, in the woven fabric of Example 1, the desired effect of "suppression of slipping" and "ease of adjustment of installation position" can be selected and obtained by selecting the side that contacts the house when covering the house. On the other hand, with the woven fabric of Example 13, the above-mentioned effects obtained with the woven fabric of Example 1 were not obtained.

[0109] [Table 1]

[0110] [Table 2]

[0111] [Table 3] [Industrial Applicability]

[0112] The woven fabric of the present invention is preferably used for agricultural sunshade sheets, awnings, shades, interior curtains and blinds, etc. [Explanation of symbols]

[0113] 1 textile 2. Tape-like yarn 3. Monofilament 3A First Face Monofilament 3B Second surface monofilament 4 area(I) 5 Area (II) 6 Area (III) 7 areas (IV) 8A First surface side 8B Second surface side

Claims

1. The main component is thermoplastic resin. a tape-shaped yarn having a visible light transmittance minus infrared transmittance of 35% or more; The main component is thermoplastic resin. It is made of a monofilament having an average transmittance of 70% or more in the wavelength range of 400 to 2500 nm, A woven fabric characterized in that the intersections of the tape-like yarn and the monofilament are fixed.

2. the fabric has a plurality of through holes; When the optical aperture ratio is defined as the value obtained by dividing the total area of the through holes and the area of the monofilaments that do not intersect with the tape-like yarn by the area of the fabric, 2. The woven fabric according to claim 1, wherein the optical aperture ratio is 1 to 15%.

3. the fabric has a plurality of through holes; When the area of the through holes is divided by the area of the fabric (percentage), the ventilation opening rate is defined as: The numerical value (percentage) obtained by dividing the ventilation opening ratio by the optical opening ratio is 75 to 95%. The woven fabric of claim 1.

4. a portion of the monofilament fabric exposed on the first surface thereof; and a first flatness at a portion fixed to the tape-like yarn; a portion of the monofilament fabric exposed on the second surface thereof; and The second flatness of the portion fixed to the tape-like yarn is The value obtained by dividing the larger flatness value by the smaller flatness value is 1.5 to 5.

0. The woven fabric according to claim 1 .

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