JP2010119492A - Sheet-like material for umbrella gore - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet-like material for umbrella gore having both of one-side see-through property and waterproofness. <P>SOLUTION: The sheet-like material 1 for umbrella gore is formed of a base fabric 2 having one-side see-through property and a transparent film 3 integrally laminated through an adhesive layer 4. The base fabric 2 has a thread part 5 of a knitted/woven fabric base and a gap part 6 to be a fabric seam, wherein the see-through property from the reverse side (lower side of Fig. 1) is secured through the gap part 6. In addition, in the sheet-like material 1 for umbrella gore, the surface side (upper side of Fig. 1) of the base fabric 2 is coated with an adhesive, wherein the integrated layer is formed by laminating the transparent film 3 on the surface of the base fabric 2 before the adhesive is hardened. In the base fabric, compared with luminosity of the color on the surface side, the luminosity of the color is lowered on the reverse side, thereby the light reflectance is reduced and see-through property in the reverse side of the base fabric is increased. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a umbrella-like sheet-like material used as an umbrella cloth for rain and rain or a parasol (rain umbrella), and particularly relates to a sheet-like article for umbrella cloth having both single-sided transparency and waterproof properties. .

Conventionally, as an umbrella cloth, there is an umbrella cloth formed from a mesh cloth. By increasing the light reflectance on the surface of the umbrella cloth and lowering the light reflectance on the back surface of the umbrella cloth, there is a sun shielding effect. The following patent document 1 proposes that the cloth can be seen through. When using the umbrella cloth as a rain umbrella, a waterproof sheet covering the surface of the umbrella cloth is attached, while when using as a parasol, the waterproof sheet is removed from the surface of the umbrella cloth.
JP 10-215927 A

  However, since the umbrella itself is not waterproof, the waterproof sheet must be attached and detached according to the weather conditions, and the installation and removal of the waterproof sheet is extremely complicated. However, it was too low to function as an umbrella. In addition, when the wind is received, air enters between the waterproof sheet and the umbrella cloth, and the waterproof sheet flutters, so that there is a problem that sufficient waterproofness as a rain umbrella cannot be secured.

  Then, this invention is made | formed in order to solve the problem mentioned above, and it aims at providing the sheet-like thing for umbrella cloth which has single-sided transparency and waterproofness.

  In order to achieve this object, the sheet material for umbrella cloth according to claim 1 is formed such that the light reflectance of the front surface is higher than that of the back surface of the knitted fabric substrate, and the back surface of the back surface of the knitted fabric substrate is higher. The base fabric to which single-sided transparency is imparted by increasing the transparency of the film and the transparent film having a waterproof property integrally laminated on the base fabric via an adhesive layer are provided.

  The sheet material for umbrella cloth according to claim 2 is the sheet material for umbrella cloth according to claim 1, wherein the transparent film has a base fabric through the adhesive layer made of an adhesive applied to the base fabric. Are integrally laminated.

  An umbrella cloth sheet according to claim 3 is the umbrella cloth sheet according to claim 1 or 2, wherein the transparent film is integrally laminated on the surface of the base fabric via the adhesive layer.

  An umbrella cloth sheet according to claim 4 is the umbrella cloth sheet according to any one of claims 1 to 3, wherein the base fabric has an opening ratio of the base fabric of 10% to 40%. Within range.

The sheet material for umbrella cloth according to claim 5 is the sheet material for umbrella cloth according to any one of claims 1 to 4, wherein the base fabric has a surface perspective lightness difference ΔL ^* ₁ of less than 3. Thus, the back surface perspective lightness difference ΔL ^* _{2 of} the base fabric exceeds 9.

  According to the sheet-like material for umbrella cloth of the present invention, the transparency from the back surface side is formed higher than the transparency from the surface side. By attaching to the umbrella with the back side facing the inside of the umbrella, it is possible to ensure visibility when looking from the inside to the inside of the umbrella, while looking into the inside from the outside of the umbrella There is an effect that it is possible to prevent seeing and seeing sunlight.

  In addition, since the surface of the umbrella-like sheet-like material has a higher light reflectance than the back surface, the amount of light transmitted from the outside of the umbrella to the inside of the umbrella can be reduced, and sunlight incident on the inside of the umbrella can be blocked. effective. Moreover, since a transparent film having waterproof properties is integrally laminated on the base fabric having such single-sided transparency through an adhesive layer, the sheet-like shape for umbrella cloth can be obtained without hindering the single-sided transparency of the base fabric. There is an effect that waterproofness is imparted to the object itself.

  Hereinafter, a sheet-like material for umbrella cloth, which is a preferred embodiment of the present invention, will be described. This umbrella-like sheet-like material combines single-sided transparency and waterproofness, and mainly includes a base fabric and a transparent film, and the base fabric and the transparent film are integrally laminated via an adhesive layer. It has been done.

<Base fabric>
The base fabric is a fabric having single-sided transparency. Here, the single-sided transparency means a property that the transparency is exhibited only on either the front surface or the back surface of the fabric because the transparency is different between the front surface and the back surface of the fabric. In particular, in the base fabric in the present embodiment, the transparency of the back surface is enhanced as compared to the front surface.

  That is, in this embodiment, the single-sided transparency possessed by the base fabric means that the transparency is ensured by reducing the light reflectance on the back surface of the base fabric, and the light reflectance on the surface of the base fabric. It means the property of not being seen through by being raised or being lowered compared to the surface of the base fabric even if it is present.

  This base fabric uses a knitted fabric as a raw material, and the knitted fabric means a general term for a woven fabric and a knitted fabric. The knitted fabric (hereinafter referred to as “knitted fabric base”) used as a material for the base fabric is, for example, a knit weave (entangled weave or entangled weave) in order to impart single-sided transparency to the base fabric. Hereinafter, it is referred to as “entangled weave” in the present specification), and those having a coarse weaving density or knitting density such as a strong twisted georgette, mesh, tricot, and raschel.

  Here, in order to impart transparency to the base fabric, the knitted fabric base of the base fabric has an aperture ratio of 10% to 40%, more preferably the fabric mesh. The aperture ratio is in the range of 15% to 30%. Here, the opening ratio of the fabric stitch means the ratio of the fabric mesh (gap) that is open within a predetermined area range of the fabric surface in the knitted fabric substrate.

  Moreover, for example, a twisted yarn or a monofilament yarn is used as the yarn for the base fabric. But about the kind of fiber of this thread | yarn, it is not necessarily limited to a specific thing. In this way, the knitted fabric base of the base fabric adopts the above-described range of the opening ratio of the fabric, and is formed using the above-described twisted yarn or monofilament yarn, so that a coarse weave for ensuring transparency is achieved. The density or knitting density is set, and strength reduction is prevented.

(Single side perspective processing of base fabric)
In addition, the base fabric is a process for increasing the light reflectance of the surface of the knitted fabric substrate and lowering the light reflectance of the back surface of the knitted fabric substrate (hereinafter referred to as “single-sided transparency treatment”). ”), The single-sided transparency is imparted. Specifically, by reducing the lightness of the color on the back side of the base fabric compared to the lightness of the color on the front side of the base fabric, the light reflectance on the back side of the base fabric is lowered and the transparency Has been increased.

  For example, a sublimation thermal transfer printing method, a vapor deposition method, a sputtering method, or a gravure coating method is used as the single-sided fluoroscopic treatment applied to the knitted fabric base.

  For example, according to the sublimation type thermal transfer printing method, sublimation is performed on one side (the back side of the base fabric) of a knitted fabric base having a high brightness color (hereinafter referred to as “high brightness color”) such as silver, white or light color. By coloring a low-lightness color such as black or dark color (hereinafter referred to as “low-lightness color”) by mold thermal transfer printing, the light reflectance on one side of this knitted fabric substrate is reduced, and single-sided transparency A base fabric to which is given is generated.

  In addition, according to the vapor deposition method, such a knitted fabric is obtained by performing vapor deposition using a vapor deposition material such as aluminum on one side (the surface of the base fabric) of the knitted fabric substrate that is colored in a low brightness color on both the front and back surfaces. By making one side of the substrate (the surface of the base fabric) a high brightness color, the light reflectance on the one side of the knitted fabric substrate is increased, and a base fabric with single-sided transparency is generated.

  In addition, according to the sputtering method, by performing sputtering using stainless steel (SUS), oxide, or the like on one side (surface of the base fabric) of the knitted fabric base material colored on the front and back surfaces in a low brightness color. By making one side of the knitted fabric base (the surface of the base fabric) a high brightness color, the light reflectance on one side of the knitted fabric base is increased, and a base fabric with single-sided transparency is generated. The

  In addition, according to the gravure coating method, a metal paste such as an aluminum paste or a white pigment is applied to one side (the surface of the base fabric) of the knitted fabric substrate having a high light reflectance that is colored in a low brightness color on both the front and back surfaces. The light reflectance of one side of the knitted fabric substrate (surface of the base fabric) is printed by a gravure coating machine together with the adhesive resin, so that one side of the knitted fabric substrate (surface of the base fabric) has a high brightness color. Is increased to produce a base fabric with single-sided transparency.

(Single-sided transparency of base fabric)
By imparting single-sided transparency in this way, the base fabric has a surface transparency lightness difference ΔL ^* ₁ of less than 3 (ΔL ^* ₁ <3) and its backside lightness difference ΔL ^*. ₂ exceeds 9 (ΔL ^* ₂ > 9).

Here, the surface transparency lightness difference ΔL ^* ₁ means that when the base fabric is placed on the white paper with the back surface of the base fabric facing the white paper, The brightness of white paper (hereinafter referred to as “surface whiteness”) L ^* ₁₁ is measured with a colorimeter, and the base fabric is placed with the back side of the base fabric facing the black paper side. When superposed on the black paper, the lightness of the black paper appearing from the surface of the base fabric (hereinafter referred to as “surface blackness”) L ^* ₁₂ is measured by a colorimeter, and the surface white color is measured. A difference value (ΔL ^* ₁ = L ^* ₁₁₋ L ^* ₁₂ ) obtained by subtracting the surface blackness L ^* ₁₂ from the lightness L ^* ₁₁ .

Further, the back surface perspective lightness difference ΔL ^* ₂ means that when the base fabric is placed on the white paper with the surface of the base fabric facing the white paper side, the base fabric is passed through from the back surface of the base fabric. The brightness of white paper (hereinafter referred to as “backside whiteness brightness”) L ^* ₂₁ is measured with a colorimeter, and the base fabric is black with the surface of the base fabric facing the black paper side. When superimposed on paper, the lightness of the black paper that appears on the base fabric from the backside of the base fabric (hereinafter referred to as “backside blackness”) L ^* ₂₂ is measured with a colorimeter, and the whiteness of the backside is measured. L ^* ₂₁ difference values obtained by subtracting the backside black lightness ^L _{* 22} from the _{^{(ΔL * 2 = L * 21}} -L * 22) say.

<Transparent film>
The transparent film is for imparting waterproofness (hydrophobicity) to the base fabric while maintaining the single-sided transparency of the base fabric. As this transparent film, a transparent polymer film having a hydrophobicity with a water resistance of 350 mmH ₂ O (water injection) (1 kgf / cm ² ≈0.098 MPa) or more is used.

Here, the JUPA standard (Japan Ocean Umbrella Promotion Council) stipulates that the water resistance (water pressure) is 250 mmH ₂ O or more as a standard indicating the waterproofness of the umbrella. On the other hand, the sheet-like material for umbrella cloth according to the present embodiment ensures the water resistance equal to that exhibited by the transparent film by integrally laminating the transparent film to the base fabric via the adhesive layer. Therefore, the above JUPA standards are sufficiently satisfied.

  Specifically, as the hydrophobic transparent film used as this transparent film, for example, a polymer film such as polyurethane, polyester, polyamide, polyethylene, polypropylene, polyacrylate, vinyl polymer, polyfluoroethylene polymer, etc. Is used.

  Furthermore, this transparent film is integrally laminated with the base fabric by a lamination method. Here, in the lamination method, the transparent film is bonded to the base fabric through an adhesive layer made of an adhesive, so that the transparent film is integrally laminated on the base fabric.

  When laminating the transparent film to the base fabric, it is preferable to apply (apply) an adhesive to the front or back surface of the base fabric on which the transparent film is laminated, and to bond the transparent film there. By applying the adhesive to the base fabric in this way, the sheet-like material for umbrella cloth according to this embodiment is maintained without losing its single-sided transparency even after lamination.

  On the other hand, when the adhesive is applied to the surface of the transparent film when the transparent film is laminated on the base fabric, the transparency of the umbrella-like sheet-like material is lost. This is considered to be caused by the irregular reflection of light on the transparent film by forming an uneven smooth layer on the transparent film by the adhesive coated on the transparent film.

  The adhesive used for lamination of the transparent film is preferably a transparent adhesive. However, the adhesive is not necessarily transparent as long as the adhesive is applied to the base fabric side. For example, if the amount of adhesive applied is small, most of the applied adhesive is present in the thread portion of the base fabric, and there is no or no adhesive in the void portion of the base fabric. This is because the transparency of the base fabric is not hindered due to the adhesive present in the gap portion of the base fabric.

  In addition, the transparent film can impart waterproofness to the base fabric regardless of whether it is laminated on the surface or the back surface of the base fabric, but more preferably on the surface side of the base fabric. When the layers are laminated, the single-sided transparency on the back side that the base fabric originally has is not hindered, and more remarkable single-sided transparency can be secured in the umbrella-like sheet-like material.

  Because, when a transparent film is laminated on the back surface of the base fabric having a low light reflectance and high transparency, the transparent reflection is induced by the transparent film, and the transparency of the back surface of the base fabric is reduced. This is to prevent such harmful effects. Moreover, by laminating and forming a transparent film on the surface side of the base fabric, the light reflection performance of the transparent film is also added to the surface side of the umbrella-like sheet, so it is combined with the light reflectivity of the surface of the base fabric. This is because the light reflectivity of the surface of the umbrella-like sheet is improved.

  In addition, although there is waterproofing processing (coating treatment) with a conventional coating agent as a means to impart waterproofness to the base fabric, it is formed by such coating agent that is not used. This is because the surface of the waterproof coating is not flat and has a non-smooth surface with irregularities, and therefore, light reflection occurs on the surface of the waterproof coating and the transparency of the base fabric disappears.

  The transparent film also has a function of improving the ultraviolet shielding property of the base fabric of the umbrella cloth sheet. Here, in the above-mentioned JUPA standard, it is specified that the ultraviolet ray cut rate is 70% or more as a standard value for admitting the display regarding the ultraviolet ray prevention processing of pure parasol. The ultraviolet cut rate means the ultraviolet shielding rate.

  On the other hand, in the sheet-like material for umbrella cloth according to the present embodiment, the transparent film is laminated on the base fabric, so that an ultraviolet cut rate equal to or higher than the reference value for the pure parasol of the JUPA standard is secured. For example, in the case of a base fabric alone, an ultraviolet cut rate of about 80% can be increased to about 90% by laminating a transparent film on the base fabric.

  In addition, the JUPA standard stipulates that the UV cut rate is 90% or more as a reference value for the display regarding the UV protection processing of umbrellas for rain and rain. However, a transparent film having an UV protection property should be used. In this case, since the ultraviolet ray cut rate is increased to about 99%, such a standard can be easily cleared.

  Further, when the transparent film is laminated on the surface of the base fabric, that is, when the transparent film is present on the surface side of the umbrella-like sheet-like material, by using a hydrophobic film as the transparent film, Water repellency is imparted to the surface of the umbrella-like sheet. On the other hand, when the transparent film is laminated and formed on the back surface of the base fabric, that is, when the surface of the umbrella-like sheet-like material becomes the surface of the base fabric, the base fabric is subjected to water repellent treatment. Thus, water repellency is imparted to the surface of the umbrella-like sheet-like material.

  As described above, the water repellency of the surface of the umbrella-like sheet-like material is imparted, so that the water repellency standard defined in the JUPA standard is grade 3 or higher.

  Next, in this specification, an evaluation method and a measurement method performed on the umbrella-like sheet-like material will be described below.

(Opening ratio of fabric eyes)
The opening ratio of the fabric is measured with a digital microscope (manufactured by Keyence Corporation, model: VHX-900) for the base fabric. For example, in the measurement of the opening ratio of the fabric eye, a measurement image is generated based on an image obtained by photographing a knitted fabric base used for a base fabric by a photographing measurement device such as a digital microscope. The ratio of the total area of the void portion present in the measurement surface image to the total area of the measurement area is calculated, and the ratio as the calculation result is obtained as the opening ratio of the fabric.

  In addition, in the measurement of the opening ratio of the fabric, the influence of irregular reflection generated on the knitted fabric base is removed from the image obtained by actually photographing the knitted fabric base as a measurement image using a photographing measurement device such as a digital microscope. The corrected image is used. As a result, a more precise calculation of the opening ratio of the fabric is performed.

(Transparent)
In the evaluation of fluoroscopy, in a situation where normal visual acuity measurement can be performed using a visual acuity test chart, the distance that the subject should leave from the visual acuity test chart during normal visual acuity measurement is secured between the visual acuity test chart and the judge In addition, the inspection sign (Landolt ring, etc.) on the visual acuity test table is read (or determined) in a state where the sheet material for umbrella cloth to be determined is suspended at a position 50 cm in front of the eye of a judge having a visual acuity of 1.0. As a result, the highest visual acuity value among the test signs that can be read is used as an evaluation value for judging transparency (hereinafter referred to as “transparency evaluation value”).

  For example, by carrying out this evaluation method of transparency, the judge can read the test sign with a visual acuity of 0.1, and if the test sign with a visual acuity of 0.2 or more cannot be read, the judge can read. Since the visual acuity value of 0.1 corresponds to the highest visual acuity value among the inspection marks, the transparency evaluation value of the umbrella-like sheet at this time is 0.1.

  Moreover, this transparency evaluation value is each determined about both the surface of a sheet-like material for umbrella cloth, and a back surface. When evaluating the transparency of the “surface” of the umbrella-like sheet-like material, the umbrella-cloth sheet-like material is hung down to the predetermined location with the “surface” directed toward the judge. On the other hand, when evaluating the transparency of the “rear surface” of the umbrella-like sheet-like material, the umbrella-cloth sheet-like material is hung down to the predetermined location with the “back surface” directed toward the judge.

(Single-sided transparency)
The evaluation of single-sided transparency is to determine the transparency evaluation value for both the front and back surfaces of the umbrella-like sheet-like material using the above-described transparency evaluation method. When the surface transparency evaluation value is 1/2 times or less of the transparency evaluation value of the back side of the umbrella sheet, the umbrella sheet is evaluated as having single-sided transparency. It is.

  For example, the transparency of both the front and back surfaces of the umbrella-like sheet-like material is evaluated. As a result, the transparency evaluation value of the front surface is 0.1, and the transparency evaluation value of the back surface is 0.3. In some cases, since the former is ½ times or less than the latter, this umbrella-like sheet is evaluated as having single-sided transparency. On the other hand, when the transparency evaluation value of the front surface is 0.2 and the transparency evaluation value of the back surface is 0.3, the former exceeds 1/2 of the latter, so this sheet for umbrella cloth is used. The thing is evaluated as having no single-sided transparency.

(UV cut rate)
The UV cut rate is an average of all the wavelength ranges in the wavelength range of 280 nm to 400 nm measured using a UV-visible spectrophotometer (manufactured by JASCO Corporation, model: V-650) for the sheet-like material for umbrella cloth. It is calculated by the law.

(Water repellency)
The water repellency is measured in accordance with the “water repellency test (spray test)” in JIS standard L1092 “Test method for waterproofness of textile products” for umbrella-like sheets.

(Water resistance)
Water resistance is measured in accordance with “Method A (low water pressure method)” of “Water resistance test (hydrostatic pressure method)” in JIS standard L1092 “Test method for waterproofness of textile products” for umbrella-like sheets. It is a thing.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings and tables. “Parts” used in the following examples and comparative examples represents parts by weight.

  FIG. 1 is a partial schematic sectional view showing the structure of an umbrella cloth sheet 1 in the first and second embodiments of the present invention. As shown in FIG. 1, an umbrella cloth sheet 1 is obtained by integrally laminating a base fabric 2 having a single-sided transparency and a transparent film 3 with an adhesive layer 4 interposed therebetween. The base fabric 2 has a yarn portion 5 of a knitted fabric base and a gap portion 6 that becomes a fabric stitch, and the transparency from the back side (lower side in FIG. 1) is secured through the gap portion 6.

  This umbrella cloth sheet 1 is coated with an adhesive on the surface side (upper side in FIG. 1) of the base fabric 2, and the transparent film 3 is laminated on the surface of the base fabric 2 before the adhesive is cured. It is a laminated one. That is, the adhesive is cured to form the adhesive layer 4, and the transparent film 3 is integrally laminated on the surface of the base fabric 2 via the adhesive layer 4.

<First embodiment>
In the sheet 1 for umbrella cloth according to the first embodiment, a woven fabric made of polyester is used as a knitted fabric base used for the base fabric 2, and the thread thickness of the woven fabric is 84 dtex. . This entangled fabric has an open area ratio of 23%.

  Here, the base fabric 2 of the first embodiment is generated by subjecting the woven fabric, which is the knitted fabric base material, to a single-sided fluoroscopic treatment including a first step and a second step described below.

(First step)
In the first step, both the front and back surfaces of the entangled fabric used as the knitted fabric base of the base fabric 2, that is, the entire entangled fabric is dyed black (color code: # 000000), and after this dyeing Calendering is performed on one side (surface) of the entangled fabric.

(Second step)
In the second step, aluminum is vapor-deposited on the calendar glossy surface of the woven fabric calendered in the first step, so that an aluminum vapor deposition layer having a thickness of 1000 mm is formed on one side (surface) of the base fabric 2.

  In this way, by the first and second steps, the transparent film 3 is laminated and formed on the base fabric 2 made transparent on one side, so that the sheet 1 for umbrella cloth of the first embodiment is generated.

  Here, the transparent film 3 is a polyurethane film (Rack Skin U-2265 (manufactured by Seiko Kasei Co., Ltd.)), and the film thickness is 20 μm. And this transparent film 3 is integrally laminated | stacked on the base fabric 2 by the 3rd process mentioned below.

(Third step)
In the third step, two-component urethane is applied as an adhesive on the aluminum vapor deposition surface, which is the surface of the base fabric 2, and the transparent film 3 is coated on the aluminum vapor deposition surface of the base fabric 2 coated with this adhesive. Are laminated by a gravure coater. Thereafter, the adhesive is cured, so that the transparent film 3 is integrally bonded to the base fabric 2 via the adhesive layer 4.

  The two-component urethane used as the adhesive is specifically Crisbon AD-865 (manufactured by DIC Corporation), and Crisbon DN-950 (manufactured by DIC Corporation) is used as its cross-linking agent. Accelerator T-81 (manufactured by DIC Corporation) is used as a crosslinking accelerator.

<Second embodiment>
In the sheet 1 for umbrella cloth according to the second embodiment, a polyester strong twisted gauze fabric is used as a knitted fabric base used for the base fabric 2, and the thickness of the strong twisted gauze fabric is small. 84 decitex. This strong twisted gauze fabric has an opening rate of 23%.

  Here, the base fabric 2 of the second embodiment is generated by performing a single-sided fluoroscopy treatment including the first step and the second step described below on the strong twisted gauze fabric that is the knitted fabric substrate. .

(First step)
In the first step, both the front and back surfaces of the above-mentioned strong twisted gauze fabric used as the knitted fabric base of the base fabric 2, that is, the whole of the twisted gauze fabric is dyed black (color code: # 000000). After that, calendering is performed on one side (surface) of the dyed strong twisted gauze fabric.

(Second step)
In the second step, a sputtering layer having a film thickness of 600 mm is formed on one side (surface) of the base fabric 2 by sputtering stainless steel on the calendar glossy surface of the strong twisted gauze that has been calendered in the first step. To do.

  As described above, the transparent film 3 is laminated and formed on the base fabric 2 that is made transparent on one side in the first and second steps, whereby the umbrella-like sheet-like product 1 of the second embodiment is generated.

  Here, the transparent film 3 is made of polyurethane (Rack Skin U-2265 (manufactured by Seiko Kasei Co., Ltd.)) containing 2 parts of an ultraviolet absorber (Hostavin 3206 (manufactured by Clariant)), and its film thickness The transparent film 3 is integrally laminated on the base fabric 2 in the third step described below.

(Third step)
In the third step, two-component urethane is applied as an adhesive on the sputtering surface, which is the surface of the base fabric 2, and the transparent film 3 is applied to the aluminum deposition surface of the base fabric 2 coated with the adhesive. Are laminated by a gravure coater. The two-component urethane used as the adhesive is the same as that in the first embodiment.

  About the umbrella-like sheet-like material 1 of the first and second examples obtained as described above, the transparency, single-sided transparency, ultraviolet cut rate, water repellency, and water resistance are described above. The results of evaluation and measurement using the method are shown in Table 1 below. In Table 1, the evaluation results and the measurement results for the same items as those of the umbrella-like sheet-like material 1 of this example are shown together with respect to the comparative example described below.

<Comparative example>
In the point that the base fabric is obtained by applying the first step and the second step in the second example to the same knitted fabric base as in the second example, the sheet-like material for umbrella cloth of the comparative example, This is common with the second embodiment. In other words, the base fabric of the comparative example is the same as the base fabric of the second embodiment described above. However, the umbrella-like sheet-like material of the comparative example is obtained by performing the coating process in the following coating process on the umbrella-like sheet-like material of the second embodiment, instead of the above-described transparent film.

(Coating process of comparative example)
In the coating process of this comparative example, a water repellent (a solution containing 3 parts of Asahi Guard AG-710 (manufactured by Asahi Glass Co., Ltd.)) is applied to the sputtering processed surface, which is the surface of the base fabric, by a pad method. After water-repellent processing and drying it, a polyurethane solution (Shin Binder B-1006) containing 3 parts of an ultraviolet absorber (UV-SUNCUT (manufactured by Huntsman)) with respect to the water-repellent sputtering surface. (Matsui Dye Chemical Co., Ltd.)) is coated at a viscosity of 15000 cps, dried, and then further heat-treated.

  According to Table 1, the sheet-like material for umbrella cloth according to the first and second examples of the present invention has one-side perspective, whereas the sheet-like article for umbrella cloth according to the comparative example does not have one-side transparency. In addition, water repellency and UV cut rate that satisfy the JUPA standard value for pure parasol were obtained. In addition, in the second example, an ultraviolet cut rate that satisfies the JUPA standard value for a rain and rain umbrella was obtained. In particular, as for the water resistance, a high measurement result significantly exceeding the JUPA standard value was obtained.

  The present invention has been described above based on the embodiments and examples. However, the present invention is not limited to the above examples, and various improvements and modifications can be made without departing from the spirit of the present invention. This can be easily guessed.

  For example, the sheet-like material for umbrella cloth in the present embodiment and examples has been described on the assumption that it is a sheet-like article for umbrella cloth, such as a rain umbrella and a rain / rain umbrella, but the use of the sheet-like material is not necessarily However, the present invention is not limited to these, and may be applied as a tent fabric such as a simple tent.

  In addition, the base fabric used in the umbrella-like sheet-like material in the present embodiment and examples may be applied to uses such as a parasol, a curtain, a mosquito net, a crib cover, a screen door, and a warm bed.

It is the partial schematic sectional drawing which showed the structure of the sheet-like material for umbrella fabrics in the 1st and 2nd Example of this invention.

Claims (5)

A base fabric that is formed with a high light reflectance on the front surface compared to the back surface of the knitted fabric substrate, and has a single-sided transparency property by increasing the transparency of the back surface compared to the surface of the knitted fabric substrate,
A sheet-like article for umbrella cloth, comprising a waterproof film having waterproof properties integrally laminated on the base fabric through an adhesive layer.   2. The umbrella-like sheet-like material according to claim 1, wherein the transparent film is integrally laminated on the base fabric through the adhesive layer made of an adhesive applied to the base fabric. .   The said transparent film is integrally laminated | stacked on the surface of the said base fabric through the said adhesive layer, The sheet-like material for umbrella cloths of Claim 1 or 2 characterized by the above-mentioned.   4. The umbrella-like sheet-like material according to claim 1, wherein the base fabric has an opening ratio of the base fabric in a range of 10% to 40%. 5. The base fabric has a surface perspective lightness difference ΔL ^* ₁ of the base fabric of less than 3 and a back surface transparency brightness difference ΔL ^* _{2 of} the base fabric of more than 9. The sheet-like material for umbrella cloth according to any one of 4.

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