JP2010133064A - Knitted fabric and lace curtain using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a knitted fabric having excellent light-reflectivity over a wide range. <P>SOLUTION: The knitted fabric using polyester fibers, each having a cross section flatness of 1.3-2.5 and multifoliate cross section. In the knitted fabric, the polyester fiber meets the relationship: 3≤D≤50 in formula (1): D=[(b1-b2)/b1]×100. The knitted fabric has a porosity of 10%-30% and a reflectance of 23% or greater on average within the light-receiving range of 20°-70°. In the knitted fabric, the polyester fiber has one circumference in the narrow side direction (the direction rectangular to the length of the longest wide side) and two or more circumferences in the wide side direction (the length direction of the longest wide side); and b1 is the maximum value of the distances from the apexes of the respective circumferences in the wide direction of the centerlines X dividing in two the narrow sides, while b2 is the minimum value. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a knitted fabric having excellent reflection characteristics over a wide range.

  In recent years, 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 a house, a curtain that is difficult to see from the outside and has high sunlight permeability is required. From these viewpoints, various proposals have been made regarding interior goods having eye-proofing properties. For example, Patent Document 1 proposes an interior product made of a fabric using a filament having a cross-sectional flatness of 2 to 6 and having two or more constricted portions in the cross-sectional shape. However, since the cross-sectional shape is not a multi-leaf cross section, there is a problem that the reflection characteristic from one direction is excellent but the reflection characteristic from multiple directions is inferior.
Patent No. 4065764

  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 knitted fabric having excellent reflection characteristics in a wide range without impairing the daylighting property and a curtain using the same. is there.

  The present invention has the following configuration in order to solve the above-mentioned problems.

  (1) A knitted fabric using a polyester fiber having a cross-sectional flatness of 1.3 to 2.5 and having a multi-leaf cross section, and the polyester fiber having a multi-lobe cross section is represented by 3 ≦ A knitted fabric satisfying D ≦ 50, having an open space ratio of 10% or more and 30% or less, and an average reflectance of 23% or more within a light receiving range of 20 ° to 70 °.

D = {(b1-b2) / b1} * 100 Formula (1)
Here, the polyester having the multi-leaf cross section has one circumferential portion in the short side direction (direction of the side perpendicular to the length of the longest long side) and the long side direction (longest long side). The maximum value of the distance from the apex of each circumferential part in the long side direction to the center line X that bisects the short side is b1, and the minimum value is b2. To tell.

  (2) The knitted fabric according to (1) above, wherein the knitted fabric has a daylighting property of 100 lx or more.

  (3) The knitted fabric according to the above (1) or (2), wherein the visibility of the knitted fabric is 2.2 or less.

  (4) A lace curtain using the knitted fabric according to any one of (1) to (3) above.

  According to the present invention, it is possible to obtain a knitted fabric and a curtain having excellent reflection characteristics over a wide range.

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

  The polyester fiber of 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. Moreover, the copolymer may be contained in the range which does not impair the effect of this invention. Commonly used matting agents, stabilizers, antistatic agents and the like may be included.

  It is important for the cross-sectional shape of the polyester fiber in the present invention that the cross-sectional flatness is 1.3 to 2.5 from the viewpoints of reflectance, lighting, and visibility. When the cross-sectional flatness is less than 1.3, the reflectance is lowered and the visibility is also lowered, so that the inside of the house cannot be easily seen from the outside. If the cross-sectional flatness exceeds 2.5, excellent reflection characteristics cannot be obtained in a wide range. More preferably, the cross-sectional flatness is 1.5 to 1.9.

  Here, the cross-sectional flatness is the length (A) of the longest long side and the length (B) of the longest side among the sides orthogonal to (A) in the cross section of the filament. Ratio (A / B).

  The cross-sectional shape of the polyester fiber needs to be multileaf. Here, multi-leafy means that there is one circumferential portion in the short side direction (the direction of the side perpendicular to the length of the longest long side) and the long side direction (the longest long side of the long side). There are two or more circumferential parts in the length), and the maximum part b1 and the minimum part b2 of the distance from the vertex of each circumferential part in the long side direction to the center line X that bisects the short side are expressed by the following equations: It represents that D to represent is 5 or more and 30 or less. When D> 0, the circumference in the long side direction has a height difference with respect to the center line X. When D is in the range of 5 or more and 30 or less, the reflection is excellent in a wide range. Has characteristics. Among them, the cross-sectional shape is preferably an ellipsoidal Yaba, from the viewpoint that excellent reflection characteristics can be obtained over a wide range.

D = {(b1-b2) / b1} × 100
The multi-leaf cross section of the polyester fiber of the present invention is not less than eight leaves, and those having a cross-sectional shape such as ellipse eight leaves, ellipse ten leaves, ellipse twelve leaves are preferably used. Representative forms of the ellipse eight leaves, the ellipse ten leaves, and the ellipse twelve leaves are shown in FIGS.

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

  In the curtain knitted fabric according to the present invention, the open space ratio is preferably 10% to 30%. If the open space ratio is less than 10%, the daylighting property is impaired, and the insertion of sunlight into the house cannot be expected. Further, when the open space ratio exceeds 30%, 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. Here, the open space ratio means that the fabric is photographed at a magnification of 25 times using a microscope, the gap portion is black and the fiber portion is color-coded into two colors using image processing software, and then the black and white portions are The ratio was calculated as a numerical value using image processing software, and the ratio of the black portion was defined as the open space ratio.

  The reflectance of the knitted fabric of the present invention is preferably 23% or more on average within the light receiving range of 20 ° to 70 °. In this invention, it can have this performance by satisfy | filling said cross-sectional oblateness ratio and open space ratio, and also using the polyester fiber which has a multileaf cross section. Here, the average value of the reflectance is obtained by measuring the reflectance in the light receiving range of 20 ° to 70 ° every 1 °.

  Further, the knitted fabric of the present invention preferably has a daylighting property of 100 lx or more and an anti-visibility property of 2.2 or less.

  The production method of the knitted fabric of the present invention is shown below.

  The structure of the knitted fabric is not particularly limited as long as it does not impair the characteristics of the present invention, but if used for a curtain, it is preferably a lace knitted fabric.

  After knitting, desizing and scouring to remove the oil on the yarn is performed. 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.

  For the dyeing, any machine can be used, but a liquid dyeing machine or an overmeier dyeing machine is used. The temperature condition of the dyeing liquid flow dyeing machine may be a dyeing temperature of a normal polyester knitted fabric, but is generally preferably 90 ° C. or higher and 135 ° C. or lower, and more preferably 120 to 135 ° C. In the dyeing operation, the dyeing assistant and its concentration, the pH of the dyeing solution, the bath ratio, the dyeing time, and the like may be the conditions normally used for polyester knitted fabrics.

  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.

  Since the knitted fabric of the present invention has excellent daylighting and visibility, it can be suitably used as a curtain that ensures particularly high safety.

  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. Cavity ratio Using a microscope, the fabric is photographed at a magnification of 25 times, and the image processing software is used to color the gaps in black and the fibers in two colors, and then the ratio of the black and white parts is image processing software. Was calculated as a numerical value, and the ratio of the black portion was defined as the open space ratio.
2. Reflectance The reflectance was measured with an Shimadzu spectrophotometer at an incident angle of 60 ° and a wavelength set in the visible light region, the incident light source and the sample were fixed, and the light receiving portion was rotated from 20 ° to 70 °. The average value was the average of the values measured every 1 ° for the reflectivity in the attendance range of 20 ° to 70 °.
3. Daylighting After turning off the lighting in the room, it was covered with a black screen so that light other than the sample part did not enter, and a fluorescent lamp was installed 100 cm from the sample to adjust the illuminance outside the sample to 600 lx. Thereafter, an illuminometer was installed at a position 20 cm behind and 10 cm in height, and the illuminance was measured.
4). Anti-Visibility The interior was placed in a state of 500 to 600 lx, and a curtain was installed at a position 100 cm away from the evaluator. After that, 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 Covered 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 visually judged. The judgment criterion is the class where the gray scale for fading color can be visually recognized as the judgment result.
Example 1
Create a lace knitting using polyester fiber with a single yarn fineness of 84 dtex, 36 single yarns, an elliptical eight-leaf cross section with a flatness of 1.6, and a D value of 19.8%. A lace curtain with an open space ratio of 13% was created.

The reflectance of the knitted fabric was an average of 28% in a light receiving range of 20 ° to 70 °, a daylighting property of 110 lx, and an anti-viewing property of 1.6 grade.
(Example 2)
Create a lace knitting using polyester fiber with a single yarn fineness of 84 dtex, 36 single yarns, an elliptical eight-leaf cross section with a flatness of 1.6 and a D value of 19.8%. After scouring dyeing, dry / heat treatment A lace curtain having an open space ratio of 26% was prepared. The reflectance of the knitted fabric was an average of 25% in a light receiving range of 20 ° to 70 °, a lighting performance of 132 lx, and an anti-visibility of 2.0 grade.
(Example 3)
Create a lace knitting using polyester fiber with a single yarn fineness of 125 dtex, 72 single yarns, an elliptical eight-leaf cross section with a flatness of 1.8 and a D value of 18.8%. After scouring dyeing, dry / heat treatment A lace curtain with an open space ratio of 15% was created.

The reflectance of the knitted fabric was an average of 27% in a light receiving range of 20 ° to 70 °, a daylighting ability of 115 lx, and a visibility of 1.7 grade.
(Comparative Example 1)
Create a lace knitting using polyester fiber with a single yarn fineness of 84 dtex, 36 single yarns, round cross-section flatness of 1.0, and after scouring dyeing, dry / heat treatment to create a lace curtain with 29% free space Created.

The reflectance of the knitted fabric was an average of 8% in the light receiving range of 20 ° to 70 °, a daylighting property of 239 lx, and an anti-visibility property of 3.2.
(Comparative Example 2)
Create a lace knitting using polyester fiber with a single yarn fineness of 84 dtex, 30 single yarns, oval ten-lobed cross section flatness of 4.5, and D value of 0%. A lace curtain with a vacancy rate of 21% was created.

  The reflectance of the knitted fabric was 18% on average in the light receiving range of 20 ° to 70 °, daylighting 132 lx, and anti-visibility 2.6 grade.

It is an example of a cross-sectional view of the present invention fiber. 1 is an example of a cross-sectional view of a fiber of the present invention. It is an example of a twelve leaf cross-sectional view of the fiber of the present invention.

Claims (4)

A knitted fabric using a polyester fiber having a cross-sectional flatness of 1.3 to 2.5 and having a multi-leaf cross section, and the polyester fiber having a multi-leaf cross section is represented by 3 ≦ D ≦ 50 in the following formula (1). The knitted fabric is characterized in that the open space ratio of the knitted fabric is 10% or more and 30% or less, and the reflectance is an average of 23% or more within the light receiving range of 20 ° to 70 °.
D = {(b1-b2) / b1} * 100 Formula (1)
Here, the polyester having the multi-leaf cross section has one circumferential portion in the short side direction (direction of the side perpendicular to the length of the longest long side) and the long side direction (longest long side). The maximum value of the distance from the apex of each circumferential part in the long side direction to the center line X that bisects the short side is b1, and the minimum value is b2. To tell. The knitted fabric according to claim 1, wherein the knitting has a daylighting property of 100 lx or more. The knitted fabric according to claim 1 or 2, wherein the knitted fabric has a visibility of 2.2 or less. A lace curtain using the knitted fabric according to any one of claims 1 to 3.

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