JP2009155736A - Woven fabric and curtain - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a woven fabric and a curtain having reflection characteristics within a wide range without deteriorating lighting properties, and having excellent non-visible properties. <P>SOLUTION: The woven fabric is obtained by using polyester fibers having an elliptical octa-lobal cross sectional shape, 1.3-1.8 cross-sectional flatness, and ≤0.5 wt.% content of an inorganic oxide. The reflectance of the woven fabric is ≥28% on the average within the light receiving range of 40-70°. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a woven fabric and a curtain having reflection characteristics in a wide range and excellent in daylighting and visibility.

  With the development of synthetic fibers, polyester fibers are mainly used today because of their superiority in functionality, ease of handling, and fashionability for curtains in the interior field, including those for clothing. In addition, this polyester fiber-based era continues, and there is no doubt about technological improvement and development.

  On the other hand, the living environment has been getting worse, and crime prevention equipment and curtains for ordinary houses, such as black curtains, that can not be seen from the outside are now being selected.

  Therefore, in order to insert sunlight into the house, it is necessary to open the curtain so that the inside of the house can be seen from the outside. Therefore, from the viewpoint of crime prevention, it is difficult to see the inside of the house from the outside and the curtain has high sunlight permeability. Is required. From these viewpoints, interior goods having eye-proofing properties have been proposed. For example, an interior article using a flat cross-section with a cross-sectional flatness of 2 to 6 in which the cross-sectional shape of the filament has two or more constricted portions has been proposed (see, for example, Patent Document 1).

However, this proposal has a problem that the flat cross section is high and the cross-sectional shape is a constricted portion, so that the reflection characteristic from one direction is excellent but the reflection characteristic from multiple directions is inferior.
JP 2004-162194 A

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a woven fabric and a curtain having a reflection characteristic in a wide range without impairing the daylighting property and having excellent visibility. There is.

The present invention has the following configuration in order to solve the above-mentioned problems. That is,
(1) A woven fabric using polyester fibers having a cross-sectional shape of elliptical foliage, a cross-sectional flatness of 1.3 to 1.8, and an inorganic oxide content of 0.5% by weight or less. The woven fabric is characterized by having an average reflectance of 28% or more within a light receiving range of 40 ° to 70 °.

  (2) The woven fabric according to (1) above, wherein the inorganic oxide is titanium dioxide.

(3) The woven fabric according to (1) or (2) above, wherein the cover factor (CF) calculated by the following formula of the woven fabric using the polyester fiber is 900 to 2200.
Cover factor (CF) = WR × (D1) ^1/2 + WF × (D2) ^1/2
(Here, WR is the warp density (main / 2.54 cm), D1 is the total warp fineness (dtex), WF is the weft density (main / 2.54 cm), and D2 is the total weft fineness (dtex)).
(4) The woven fabric according to any one of (1) to (3) above, wherein the daylighting property of the woven fabric using the polyester fiber is 100 lx or more.

  (5) The woven fabric according to any one of (1) to (4) above, wherein the visibility of the woven fabric using the polyester fiber is 2.2 or lower.

  (6) The woven fabric according to any one of (1) to (5), wherein the woven fabric using the polyester fiber is for a curtain.

  (7) A curtain comprising the woven fabric described in any one of (1) to (5).

  The present invention uses a polyester fiber having a cross-sectional shape of an elliptical eight leaf, a cross-sectional flatness of 1.3 to 1.8, and an inorganic oxide content of 0.5% by weight or less. Thus, it is possible to obtain a polyester fabric and curtain having reflection characteristics from multiple directions and excellent in daylighting and visibility.

  Hereinafter, embodiments of the present invention will be described in detail.

  The polyester fiber used in the present invention is a fiber made of polyester such as polyethylene terephthalate, polytrimethylene terephthalate, or polybutylene terephthalate. Among these, those substantially consisting of polyethylene terephthalate are preferable from the viewpoint of light resistance.

  The polyethylene terephthalate used in the present invention is preferably composed of a polymer component having an ethylene terephthalate unit as a main repeating unit. That is, as the polyethylene terephthalate, a polyester obtained using terephthalic acid as the main acid component and ethylene glycol as the main glycol component is preferable. However, it is preferable that a copolymer component capable of forming another ester bond is contained in a proportion of 20 mol% or less, and more preferred is a component contained in a proportion of 10 mol% or less. Examples of copolymerizable compounds include sulfonic acid, sodium sulfonic acid, sulfuric acid, sulfuric ester, diethyl sulfate, ethyl sulfate, aliphatic sulfonic acid, ethanesulfonic acid, chlorobenzene sulfonic acid, alicyclic sulfonic acid, isophthalic acid, sebacic acid Dicarboxylic acids such as azelaic acid, dimer acid, adipic acid, oxalic acid and decanedicarboxylic acid, dicarboxylic acids such as p-hydroxybenzoic acid and ε-caprolactone, triethylene glycol, polyethylene glycol, propanediol Diols such as butanediol, pentanediol, hydroquinone and bisphenol A are preferably used.

  Further, matting agents, stabilizers, antistatic agents and the like which are usually used within a range not losing the object of the present invention may be included.

  It is important that the cross-sectional shape of the polyester fiber in the present invention is an elliptical eight leaf and a cross-sectional flatness of 1.3 to 1.8 from the viewpoints of reflectance, daylighting, and visibility. If the flatness is less than 1.3, the reflectance is lowered and the visibility is also lowered, so that it is difficult to see the inside of the house from the outside from the viewpoint of crime prevention, which is a feature of the present invention. It becomes difficult to make it below grade. On the other hand, when the flatness exceeds 1.8, the reflection characteristic, which is a feature of the present invention, is poor in the reflection characteristics in a wide range of an average of 28% or more within the light receiving range of 40 ° to 70 °. More preferably, it has an elliptical lobe and a cross-sectional flatness of 1.5 to 1.6. In addition, the typical form of the cross-sectional shape of an ellipse eight leaf is shown in FIG.

  Here, the cross-sectional flatness is the ratio (A / B) of the length (A) of the long side and the length (B) of the short side in the cross section of the filament.

  Further, the copolymer may be contained within a range not losing the object of the present invention, but the inorganic oxide (usually titanium dioxide is usually used) used as a matting agent is 0.5% by weight. The following is preferable. If the amount exceeds 0.5% by weight, the surface reflection characteristics of the fibers are lowered, and the visibility is also lowered, making it difficult to see the inside of the house from the outside from the viewpoint of crime prevention, which is the original purpose. Further, even if no inorganic oxide is used, there is no particular problem with the present invention.

  The fiber form of the polyester fiber in the present invention is not particularly limited, and may be a long fiber or a short fiber, and may be subjected to air twisting such as false twist crimping, taslan processing, or interlace processing.

  The total fineness and single yarn fineness of the polyester fiber in the present invention are not particularly limited, but from the viewpoint of texture, the total fineness is 30 to 500 dtex, more preferably 50 to 250 dtex, and the single yarn fineness is 0.1 to 5 dtex, more preferably. What is in the range of 0.5-3 dtex is good.

  The polyester fiber having an elliptical lobe of the present invention and having a cross-sectional flatness of 1.3 to 1.8 is usually made of polyester using a spinneret having a discharge hole in the shape of a polymer discharge hole as shown in FIG. It can be obtained by melt spinning by the method, winding up while cooling and refueling, and then drawing at a desired draw ratio.

In the woven fabric in the present invention, the cover factor (CF) calculated by the following formula is preferably 900 to 2200. When the cover factor is less than 900, the reflectivity decreases, and from the viewpoint of crime prevention, which is a feature of the present invention, it is difficult to see the inside of the house from the outside, and it becomes difficult to make the visibility level 2.2 or lower. On the other hand, when the cover factor exceeds 2200, the daylighting ability is impaired, and it becomes difficult to achieve the daylighting ability of 100 lx or more, which is a feature of the present invention, and the insertion of sunlight into the house cannot be expected.
Cover factor (CF) = WR × (D1) ^1/2 + WF × (D2) ^1/2
(Here, WR is the warp density (main / 2.54 cm), D1 is the total warp fineness (dtex), WF is the weft density (main / 2.54 cm), and D2 is the total weft fineness (dtex)).
A loom, rapier, air jet loom, water jet loom or the like can be used as the loom, but a water jet loom method in which yarn fluff is less likely to scatter is preferable. The weaving conditions such as the weaving speed can be set appropriately as long as weaving is possible, and may be any condition as long as it is usually performed for polyester fabrics.

  The structure of the woven fabric is not particularly limited as long as the characteristics of the present invention are not impaired, and a woven fabric structure such as a plain structure, a twill structure, and a satin structure can be used.

  After weaving, scouring without scouring is performed to remove the glue that has been attached to warp the warp before weaving. The desizing scouring may be performed according to a conventional method using an open soap or the like. Moreover, you may perform drying and a preset in the temperature range of 120-180 degreeC generally performed.

  Staining is performed using a liquid dyeing machine. The liquid dyeing machine includes a method in which a cloth is conveyed through the liquid dyeing machine by a liquid flow jetted by a nozzle or a flow pipe and a reel drive, and a method in which the cloth is conveyed only by a nozzle, but is not particularly limited. For the former, nozzle type and reel drive type “circular” (manufactured by Nissen Co., Ltd.), “uniace” (Nisaka Manufacturing Co., Ltd.) and the like are generally used. For the latter, UNIACE and circular types that circulate the cloth only by the nozzle method are generally used. It can be appropriately set according to the nozzle pressure, reel speed, cloth speed, liquid amount, weaving density, input amount, dye concentration, and the like. The temperature condition of the liquid dyeing machine may be any temperature at which the polyester fabric is usually dyed, but is generally 90 ° C. or higher and preferably 135 ° C. or lower, more preferably 120 to 135 ° C. Further, in the dyeing operation, the dyeing assistant and its concentration, the pH of the dyeing solution, the bath ratio, the dyeing time, etc. may be the conditions that are usually used for polyester fabrics.

  Further, after dyeing, resin processing according to the purpose such as antifouling, flexibility, main body, water repellency may be applied.

  In order to stabilize the product quality after the dyeing process, a finishing set which is usually performed for the purpose of widthening or removing wrinkles may be applied. Generally, a pin tenter is used and the set temperature is 160 to 200 ° C. Moreover, you may dry with a thermal cylinder, a net dryer, etc. before setting as needed.

  The thus obtained woven fabric having reflective characteristics over a wide range according to the present invention has an elliptical eight-leaf section, and a woven fabric using polyester fibers having a cross-sectional flatness of 1.3 to 1.8 has a light receiving range of 40. It is a woven fabric having reflection characteristics over a wide range of 28% or more on average within the range of ° to 70 °.

  Further, in the woven fabric used in the present invention, the cover factor (CF) calculated by the following formula is 900 to 2200, and the woven fabric has a reflective property in a wide range.

  Further, the woven fabric used in the present invention is a woven fabric having reflection characteristics in a wide range, characterized by having a daylighting property of 100 lx or more.

  Further, the woven fabric used in the present invention is a woven fabric having reflective properties in a wide range, characterized in that the visibility of the woven fabric is 2.2 or lower.

Hereinafter, the present invention will be described in detail with reference to examples. The evaluation method used in the present invention is as follows.
(1) [Fineness]
According to the measurement method described in JIS-L-1013.
(2) [Weaving density]
According to the measurement method described in JIS-L-1096.
(3) [Cover factor]
It was calculated by the following formula.
Cover factor (CF) = WR × (D1) ^1/2 + WF × (D2) ^1/2
(Here, WR is the warp density (main / 2.54 cm), D1 is the total warp fineness (dtex), WF is the weft density (main / 2.54 cm), and D2 is the total weft fineness (dtex)).
(4) [Reflectance]
With an Shimadzu spectrophotometer, the incident angle was 60 °, the wavelength was set in the visible light region, the incident light source and sample were fixed, and the reflectance was measured when the light receiving part was rotated to 0 to ± 90 °.
(5) [Daylighting]
After the room illumination is turned off, the light is covered with a black screen so that light does not enter other than the sample portion, and a fluorescent lamp is installed at a distance of 100 cm from the sample to adjust the illuminance outside the sample to 600 lx. Thereafter, an illuminometer is installed at a position 20 cm behind and 10 cm in height, and the illuminance is measured.
(6) [Visibility prevention]
The room illuminance is set to 500 to 600 lx, and a curtain is installed at a position 100 cm away from the evaluator. A gray scale for fading color of JIS-L-0804 is installed at the position of 70cm behind, and the space 70cm square in front of it is surrounded by a silk screen cloth, a fluorescent lamp is installed over the cloth, and the outside is further covered. Cover with a black curtain. At that time, the illuminance in the 70 cm square in front of the gray scale for fading was adjusted to 1300 lx, and then visual judgment was performed. The judgment criterion is the class where the gray scale for fading color can be visually recognized as the judgment result. The gray scale for fading color is displayed with 1 to 5 grades divided into 0.5 grades, and the measurement is performed with 0.5 grade divisions. In calculating the results, the maximum and minimum one measurement results are excluded from the five measurement results, and the average value of the remaining three measurement results is used as the final measurement result.

Example 1
A polyethylene terephthalate having an intrinsic viscosity of 0.66 is used, melt-spun at a spinning temperature of 290 ° C. and a spinning speed of 1600 m / min, using a spinneret having a discharge hole shape shown in FIG. 2, and has a cross section as shown in FIG. A polyester fiber having a yarn fineness of 84 dtex and a single yarn number of 36 was obtained.
Subsequently, hot roll drawing was performed at a drawing speed of 800 m / min, a heating roller of 90 ° C. at a draw ratio of 30 ± 2%, and the single yarn fineness was 84 dtex, the number of single yarns was 36, and the flatness was 1 at the elliptical eight leaf cross section. .6 filament drawn yarn not containing titanium dioxide.
Using these drawn yarns as warp and weft, a plain woven boil curtain was prepared, and after scouring dyeing, drying / heat treatment was applied to weave a woven fabric having a cover factor (CF) of 1300.
The reflectance of the fabric was an average of 30% in the light receiving range of 40 ° to 70 °, a daylighting property of 108 lx, and a visibility of 1.9 grade.

(Comparative Example 1)
A polyethylene terephthalate having an intrinsic viscosity of 0.66 is used, melt spinning is performed at a spinning temperature of 290 ° C. and a spinning speed of 1600 m / min using a usual spinneret having a round discharge hole shape, and a single yarn fineness having a round cross section of 84 dtex, A polyester fiber having 36 yarns was obtained.
Subsequently, hot roll drawing was performed at a drawing speed of 800 m / min, a heating roller of 90 ° C. at a draw ratio of 30 ± 2%, and the single yarn fineness was 84 dtex, the number of single yarns was 36, and the flatness was 1 at the elliptical eight leaf cross section. .6 filament drawn yarn not containing titanium dioxide.
Using these drawn yarns as warp and weft, a plain woven boil curtain was prepared, and after scouring dyeing, drying / heat treatment was applied to weave a woven fabric having a cover factor (CF) of 1300.
The reflectance of the fabric was an average of 20% in the light receiving range of 40 ° to 70 °, the lighting performance was 140 lx, and the visibility was 4.25 grade.

It is a cross-sectional view of the fiber which shows the typical form of the cross-sectional shape of the ellipse eight leaf of this invention. It is a figure which shows an example of the spinneret discharge hole which obtains the fiber of the cross-sectional shape of the elliptical eight leaf of FIG.

Explanation of symbols

A: Length of long side in cross section of filament B: Length of short side in cross section of filament

Claims (7)

Reflectivity of woven fabric using polyester fiber having a cross-sectional shape of an elliptical octalo, a cross-sectional flatness of 1.3 to 1.8, and an inorganic oxide content of 0.5% by weight or less Is an average of 28% or more within a light receiving range of 40 ° to 70 °. The woven fabric according to claim 1, wherein the inorganic oxide is titanium dioxide. The woven fabric according to claim 1 or 2, wherein a cover factor (CF) calculated by the following formula of the woven fabric using polyester fibers is 900 to 2200.
Cover factor (CF) = WR × (D1) ^1/2 + WF × (D2) ^1/2
(Here, WR is the warp density (main / 2.54 cm), D1 is the total warp fineness (dtex), WF is the weft density (main / 2.54 cm), and D2 is the total weft fineness (dtex)). The woven fabric according to any one of claims 1 to 3, wherein the daylighting property of the woven fabric using the polyester fiber is 100 lx or more. The fabric according to any one of claims 1 to 4, wherein the fabric using polyester fiber has a visibility of 2.2 or lower. The woven fabric according to any one of claims 1 to 5, wherein the woven fabric using polyester fibers is used for curtains. A curtain comprising the woven fabric according to any one of claims 1 to 5.

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