Light-shielding member for vehicle

Abstract

To provide a vehicular light shielding member which satisfactorily shields sunlight into a vehicle, thereby enabling temperature in the vehicle to be sufficiently suppressed, and enabling thermal sensation for an occupant to be reduced, and which furthermore enables inside of the vehicle to be hard to see from outside and privacy in the vehicle to be sufficiently ensured.SOLUTION: In a vehicular sheet-like or a film-like light shielding member, a first fiber component in which a reflection member for reflecting light is contained in fiber and a second fiber member in which an absorption member for absorbing light heat is contained in the fiber are woven. The vehicular sheet-like or a film-like light shielding member has: a first surface which faces an outside of the vehicle and is woven in such a manner that the first fiber member appears on a surface of the light shielding component at a higher ratio than the second fiber member; and a second surface which faces an inside of the vehicle and is woven in such a manner that the second fiber member appears on the surface of the light shielding component at a higher ratio than the first fiber member.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a light-shielding member for vehicles to be installed in the interior of an automobile or the like. [Background technology]

[0002] Shading members installed in the interior of an automobile, for example, can cover the vehicle's windows to block direct sunlight, suppress the temperature rise inside the vehicle due to sunlight entering the cabin, and ensure privacy inside the cabin. As the light-shielding member, one formed of black dope-dyed threads generally colored with carbon black is generally known. Also known is a light-shielding member made of fabric containing metal oxides such as titanium oxide in its fibers. For example, Patent Document 1 discloses a shade device for a vehicle in which the screen body is formed from a cloth containing metal oxides such as titanium oxide as light-reflecting particles in the fibers. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-185835 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the black dope-dyed yarn used in general vehicle light-shielding members is colored with carbon black, and this carbon black has a heat-storing effect, so it absorbs infrared rays that have passed through the vehicle's window glass, thereby reducing the amount of infrared rays that reach the passengers.However, because the carbon black stores heat, there is a problem in that the light-shielding member itself retains heat, causing a slow rise in the temperature inside the vehicle. On the other hand, the titanium oxide-containing thread used in Patent Document 1 (hereinafter also referred to as "titanium oxide thread") reflects infrared rays and returns them to the outside of the vehicle, making it less likely to raise the temperature inside the vehicle. However, its ability to reduce the amount of infrared rays reaching passengers is inferior to that of black dyed thread, so there was a problem in that passengers were more likely to feel the scorching heat of sunlight when using a shading material using titanium oxide thread. Therefore, the object of the present invention is to provide a shading member for a vehicle that has good shading properties against sunlight entering the vehicle interior, sufficiently suppresses the temperature inside the vehicle, reduces the feeling of heat felt by passengers, and makes it difficult to see inside the vehicle from outside the vehicle, thereby ensuring sufficient privacy inside the vehicle. [Means for solving the problem]

[0005] The present invention has been made to achieve the above object and has the following configuration. <1> A sheet-like or film-like light-shielding member for vehicles made of woven or knitted fibers, The fibers to be woven or knitted include a first fiber member containing a reflective material that reflects light; a second fiber member containing an absorbing material that absorbs the heat of light; A first surface is woven or knitted so that the first fiber member appears on the surface of the light-blocking member at a higher ratio than the second fiber member, and is directed toward the outside of the vehicle; A light-shielding member for a vehicle, which is woven or knitted so that the second fiber member appears on the surface of the light-shielding member at a higher ratio than the first fiber member, and has a second surface facing the inside of the vehicle. <2> the appearance rate of the first fiber member on the first surface is 35% or more; <1> The light-shielding member for a vehicle described above. <3> the appearance rate of the second fiber member on the second surface is 50% or more; <1> or <2> The light-shielding member for a vehicle described above. <4> The reflective member contains titanium oxide, and the content of titanium oxide in the first fiber member is 2.0 mass % or more and 8.0 mass % or less. <1> ~ <3> 10. The light-shielding member for a vehicle according to claim 9, wherein the light-shielding member for a vehicle is a light-shielding member for a vehicle. <5> The absorbing member contains a heat absorbing pigment, and the content of the pigment in the second fiber member is 0.5% by mass or more and 3.0% by mass or less. <1> ~ <4> 10. The light-shielding member for a vehicle according to claim 9, wherein the light-shielding member for a vehicle is a light-shielding member for a vehicle. <6> A sheet-like or film-like light-shielding member for vehicles made of woven or knitted fibers, The fibers to be woven or knitted include a third fiber member containing a reflective material that reflects light and an absorbing material that absorbs the heat of light, and a fourth fiber member that does not contain a reflective material that reflects light or an absorbing material that absorbs the heat of light, a third surface that is woven or knitted so that the third fiber member appears on the surface of the light-shielding member at a higher ratio than the fourth fiber member, and that faces the outside of the vehicle; A light-shielding member for a vehicle, the light-shielding member having a fourth surface facing the inside of the vehicle, the fourth fiber member being woven or knitted so as to appear on the surface of the light-shielding member at a higher ratio than the third fiber member. <7> the appearance rate of the third fiber member on the third surface is 35% or more; <6> The light-shielding member for a vehicle described above. <8> the appearance rate of the third fiber member on the third surface is 50% or more; <6> or <7> The light-shielding member for a vehicle described above. <9> The reflective member contains titanium oxide, and the content of titanium oxide in the third fiber member is 2.0 mass % or more and 8.0 mass % or less. <6> ~ <8> 10. The light-shielding member for a vehicle according to claim 9, wherein the light-shielding member for a vehicle is a light-shielding member for a vehicle. <10> The absorption member contains a heat absorbing pigment, and the content of the pigment in the third fiber member is 0.5% by mass or more and 3.0% by mass or less. <6> ~ <9> 10. The light-shielding member for a vehicle according to claim 9, wherein the light-shielding member for a vehicle is a light-shielding member for a vehicle. [Effects of the Invention]

[0006] To provide a light-shielding member for a vehicle that has good shading properties for sunlight entering the vehicle interior, sufficiently suppresses the temperature inside the vehicle, reduces the feeling of heat felt by occupants, and also makes it difficult to see inside the vehicle from outside the vehicle, thereby ensuring sufficient privacy inside the vehicle. [Brief explanation of the drawings]

[0007] [Figure 1]FIG. 1 is a photograph of the product of the present invention (heat shielding screen 1) manufactured in Example 1. [Figure 2] FIG. 2 is a photograph of the comparative product (mass-produced product) prepared in Comparative Example 1. [Figure 3] FIG. 3 is a diagram showing a schematic diagram of a heat resistance testing device. [Figure 4] FIG. 4 is a graph showing the results of a heat resistance test under direct light. [Figure 5] FIG. 5 is a graph showing the results of a heat resistance test under light at a fixed distance. DETAILED DESCRIPTION OF THE INVENTION

[0008] The inventors conducted extensive research to solve the problems of light-shielding members using black dope-dyed yarn containing carbon black being insufficient in suppressing the temperature inside a vehicle, and light-shielding members using titanium oxide yarn being insufficient in reducing the amount of infrared rays reaching passengers.As a result, they found that the above problems can be solved by forming a light-shielding member using both black dope-dyed yarn containing carbon black and titanium oxide yarn, weaving and knitting the surface facing the outside of the vehicle so that the titanium oxide yarn appears on the surface in a higher proportion than the black dope-dyed yarn containing carbon black, and weaving and knitting the surface facing the inside of the vehicle so that the black dope-dyed yarn containing carbon black appears on the surface in a higher proportion than the titanium oxide yarn (first embodiment). As a result of further investigation, it was found that the above problems can also be solved by preparing a yarn containing both titanium oxide and carbon black and a yarn containing neither titanium oxide nor carbon black, and weaving and knitting the surface of the light-shielding member facing the outside of the vehicle so that the yarn containing both titanium oxide and carbon black appears on the surface at a higher rate than the yarn containing neither titanium oxide nor carbon black, while weaving and knitting the surface facing the inside of the vehicle so that the yarn containing neither titanium oxide nor carbon black appears on the surface at a higher rate than the yarn containing both titanium oxide and carbon black (second embodiment). First, a first embodiment of the present invention will be described.

[0009] First Embodiment The light-shielding member for a vehicle according to the first embodiment is in the form of a sheet or film, and is formed by weaving or knitting fibers. The fibers to be woven or knitted include a first fiber member containing a reflective material that reflects light; The second fiber member has fibers containing an absorbing material that absorbs the heat of light.

[0010] (First fiber member) The first fiber member includes a reflective member (hereinafter also referred to as a light-reflective member) that reflects light, particularly infrared light. The fibers may be made of polyolefin fibers such as polyester fibers or polypropylene fibers, polyamide fibers, acrylic fibers, or the like. For example, the polyester that constitutes the polyester fiber may be polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), or the like. In addition to the light-reflective member, the fiber may also include additives such as a curing agent, a flame retardant, an antibacterial agent, a colorant, or the like as minor components. The term "minor component" refers to a component that is contained in a smaller amount than the main component of the fiber (for example, polyester in the case of polyester fiber). When multiple additives are present, the total additive content is less than the main component.

[0011] The fiber may take the form of a multifilament yarn, a monofilament yarn, a spun yarn, or the like. The fineness of a single yarn (single fiber density) constituting the fiber is not particularly limited, but can be, for example, 0.9 dtex or more and 3.5 dtex or less. Here, the unit "dtex" means the number of grams of mass per 10 km of length. In the case of a multifilament yarn, a single yarn refers to one of the multiple filaments constituting the multifilament yarn. The cross-sectional shape of the single yarn is not particularly limited, and can be an ellipse including a perfect circle, a triangle, a flat shape, or the like. In the case of a multifilament yarn, the fineness of the fiber is not particularly limited, but can be, for example, 1.1 dtex or more and 2.5 dtex or less. The fiber density in the finished product is preferably 42 fibers / inch to 52 fibers / inch in the warp direction, and particularly preferably 46 fibers / inch to 48 fibers / inch. The weft direction preferably has a density of 23 to 32 fibers / inch, and more preferably 27 to 29 fibers / inch. By having the fiber density within the above range, it is possible to appropriately suppress infrared rays penetrating from external light and to structure the yarns with different performance characteristics so as to take advantage of their respective heat-shielding properties by varying the appearance ratios on the front and back surfaces.

[0012] The light reflecting member can be made of metal oxides, metals, ceramics, non-metallic inorganic materials, or a combination of some or all of these. For example, the metal oxide can be titanium oxide (TiO2 in a stoichiometric ratio), zinc oxide, or the like. The metal can be stainless steel, or the like. The ceramic can be silicon oxide, or the like. Among these, titanium oxide is particularly preferred because it has a higher refractive index than diamond and can therefore efficiently reflect light, imparting high light-shielding and heat-shielding properties to the light-shielding member.

[0013] The content of the light-reflecting material in the first fiber member is preferably 2.0% by mass or more and 8.0% by mass or less, and more preferably 3.0% by mass or more and 5.0% by mass or less. When the content of the light-reflecting material is equal to or more than the above-mentioned lower limit, the light-shielding material can have particularly good light-shielding and heat-shielding properties. When the content of the light-reflecting material is equal to or less than the above-mentioned upper limit, it is preferable because it is easy to form a single yarn incorporating the light-reflecting material.

[0014] The first fiber member containing the light reflecting member described above can be manufactured by various known methods. For example, fibers incorporating a light-reflecting material can be produced by mixing additive-free polyester chips with titanium oxide and, if necessary, other additives, drying, melting, and spinning the mixture. When producing multifilament fibers, single yarns incorporating a light-reflecting material are formed. Fibers incorporating a light-reflecting material can also be produced by drying and melting additive-free polyester chips, mixing them with titanium oxide and, if necessary, other additives, and spinning the mixture. When mixing titanium oxide and, if necessary, other additives, a pre-formed high-concentration masterbatch may be mixed.

[0015] (Second fiber member) The second fiber member includes an absorbing material (hereinafter also referred to as a light absorbing material) that absorbs light, particularly infrared heat. As with the first fiber member, the fibers may include polyester fibers, polyolefin fibers such as polypropylene fibers, polyamide fibers, acrylic fibers, etc. For example, polyesters that make up the polyester fibers may include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), etc. In addition to the light absorbing material, the fibers may also include additives such as curing agents, flame retardants, antibacterial agents, colorants, etc. as secondary components.

[0016] The fiber may take the form of a multifilament yarn, a monofilament yarn, a spun yarn, or the like, as in the first fiber member. The fineness of a single yarn constituting the fiber is not particularly limited, but may be, for example, 0.9 to 3.5 dtex (decitex). Here, the unit "dtex" means the number of grams of mass per 10 km of length. In the case of a multifilament yarn, a single yarn refers to one of the multiple filaments constituting the multifilament yarn. The cross-sectional shape of the single yarn is not particularly limited, and may be an ellipse including a perfect circle, a triangle, a flat shape, or the like. In the case of a multifilament yarn, the fineness of the fiber is not particularly limited, but may be, for example, 1.1 to 2.5 dtex. The fiber density in the finished product is preferably 42 fibers / inch to 52 fibers / inch in the warp direction, and more preferably 46 fibers / inch to 48 fibers / inch. The weft direction preferably has a density of 23 to 32 fibers / inch, and more preferably 27 to 29 fibers / inch. By having the fiber density within the above range, it is possible to appropriately suppress infrared rays penetrating from external light and to structure the yarns with different performance characteristics so as to take advantage of their respective heat-shielding properties by varying the appearance ratios on the front and back surfaces.

[0017] Examples of the light absorbing material include heat absorbing pigments, and examples of the heat absorbing pigments include carbon black and pigment-based black. Among these, carbon black is particularly preferred from the viewpoint of heat absorption.

[0018] The content of the light absorbing material in the second fiber member is preferably 0.5% by mass or more and 3.0% by mass or less, and more preferably 1.0% by mass or more and 1.4% by mass or less, in the second fiber member. If the content of the light-absorbing material falls within the above range, it is preferable in terms of light absorption performance (performance of controlling transmission into the room), color expression, and required strength of the raw yarn.

[0019] The second fibrous member containing the light-absorbing member described above can be produced by various known methods. For example, the second fibrous member can be produced by kneading the raw material into PET fibers and then forming the raw material into fibers.

[0020] In the light-shielding member of the first embodiment, the surface facing the outside of the vehicle is woven or knitted so that the first fiber member appears on the light-shielding member surface at a higher ratio than the second fiber member, and this surface is referred to as the first surface. It is preferable that the first fiber member have an application ratio of 35% or more on the first surface, as this has the effect of making the inside of the vehicle less visible from the outside of the vehicle and efficiently reflects infrared rays. On the other hand, the surface facing the inside of the vehicle is woven or knitted so that the second fiber members appear on the surface of the light-shielding member at a higher ratio than the first fiber members, and this surface is referred to as the second surface. It is preferable that the appearance ratio of the second fiber members on the first surface is 50% or more, in order to ensure that the outside of the vehicle is not obstructed from the inside of the vehicle. The appearance rate refers to the area ratio of a specific fiber component to a specific surface.

[0021] The light-shielding member of the first embodiment is formed by weaving and knitting a first fiber member and a second fiber member. The weaving and knitting of the first fiber member and the second fiber member can be carried out by various known methods, but considering the strength, elongation, thickness, interior and exterior visibility, and light-shielding properties required for the product of the present invention, which is a vehicle light-shielding member, weaving and knitting using a warp knitting machine is preferred, and tricot knitting is more preferred among them.

[0022] The layer constituting the first surface (hereinafter referred to as the first surface layer) is preferably made of tricot, and has a basis weight of 60 / m 2 More than 85 / m 2 less than 60 / m 2 More than 80 / m 2 By having the basis weight within the above range, it is possible to ensure the biotechnical suitability, light-shielding properties, and heat insulation properties required for a vehicle light-shielding member. In the case of tricot, the density of the first surface layer is preferably 26 threads / inch or more and 30 threads / inch or less in the weft direction and 45 threads / inch or more and 49 threads / inch or less in the course direction, but there is no problem in selecting a weight appropriate to the required performance.

[0023] The first surface layer preferably has a thickness of 0.30 mm or less, and more preferably 0.15 mm or more and 0.25 mm or less. By having the thickness within this range, it is possible to ensure the productivity, light-shielding properties, and heat insulation properties required for a vehicle light-shielding member. The surface of the first surface layer may be further treated depending on the intended use, for example, to have water repellency, antibacterial properties, or antiviral properties. The total thickness of the first surface layer and the second surface layer is preferably 0.3 mm to 0.7 mm. Having the total thickness within this range is preferable in terms of terminal processability during commercialization and compatibility with layout restrictions when mounted on a vehicle.

[0024] The layer constituting the second surface (hereinafter referred to as the second surface layer) is preferably a tricot with a basis weight of 130 g / m 2 More than 180g / m 2 or less, especially 140 g / m 2 More than 170g / m 2 By having the basis weight within the above range, it is possible to ensure the biotechnical suitability, light-shielding properties, and heat insulation properties required for a vehicle light-shielding member. In the case of tricot, the density of the second surface layer is preferably 26 to 30 per inch in the weft direction and 45 to 49 per inch in the course direction, but there is no problem in selecting an appropriate weight depending on the required performance.

[0025] The thickness of the second surface layer is preferably 0.35 mm or more and 0.50 mm or less, and more preferably 0.40 mm or more and 0.50 mm or less. The surface of the second surface layer may be further treated depending on the intended use, for example, to have water repellency, antibacterial properties, or antiviral properties.

[0026] Next, a light blocking member according to a second embodiment will be described. The light-shielding member of the second embodiment is the same as the light-shielding member of the first embodiment, except that, instead of the first fiber member, a third fiber member is used as the fiber for weaving, the fiber containing a light-reflecting member that reflects light and a light-absorbing member that absorbs the heat of light, and instead of the second fiber member, a fourth fiber member is used that does not contain either a light-reflecting member that reflects light or a light-absorbing member that absorbs the heat of light.

[0027] (Third fiber member) The light reflecting member used in the third fiber member is the same as the light reflecting member used in the first fiber member, and the description of the first fiber member applies as is. The content of the light reflecting member in the third fiber member is preferably 2.0% by mass to 8.0% by mass, more preferably 3.0% by mass to 5.0% by mass. The light absorbing member used in the third fiber member is the same as the light absorbing member used in the second fiber member, and the description of the second fiber member applies as is. The content of the light absorbing material in the third fiber member is preferably 0.5% by mass to 3.0% by mass, more preferably 1.0% by mass to 1.4% by mass.

[0028] The fibers used in the third fibrous member are the same as the fibers used in the first fibrous member, and the description of the first fibrous member applies as is. The third fiber member described above can be manufactured in the same manner as the first fiber member, except that a light absorbing member is added in addition to the light reflecting member.

[0029] The fourth fiber member is the second fiber member that does not contain a light-absorbing member, and the fibers used are the same as those used in the second fiber member. Therefore, the same explanation as for the second fiber member applies to the fourth fiber member, except for the explanation regarding the light-absorbing member.

[0030] In the second embodiment, the surface facing the outside of the vehicle is woven or knitted so that the third fiber member appears on the surface of the light-shielding member at a higher rate than the fourth fiber member, and this surface is referred to as the third surface. The third surface preferably has an application rate of the third fiber member of 35% or more, and the surface facing the inside of the vehicle is woven or knitted so that the fourth fiber member appears on the surface of the light-shielding member at a higher rate than the third fiber member, and this surface is referred to as the fourth surface. The application rate of the fourth fiber member on the fourth surface is preferably 50% or more. The appearance rate has the same meaning as in the first embodiment.

[0031] The light-shielding member of the second embodiment is formed by weaving and knitting a third fibrous member and a fourth fibrous member in the same manner as the weaving and knitting of the first fibrous member and the second fibrous member in the first embodiment. Furthermore, the explanations for the third and fourth surfaces can be applied directly to the explanations for the first and second surfaces in the first embodiment, except for the points relating to the light reflecting member and the light absorbing member, respectively.

[0032] The vehicle light-shielding member of the present invention having the above-mentioned configuration has a two-layer structure (first embodiment) consisting of a first surface layer facing the outside of the vehicle, in which a first fiber member having a light-reflecting material impregnated in its fibers appears on the surface of the light-shielding member at a higher ratio than a second fiber member having a light-absorbing material impregnated in its fibers, and a second surface layer facing the inside of the vehicle, in which a second fiber member having a light-absorbing material impregnated in its fibers appears on the surface of the light-shielding member at a higher ratio than a first fiber member having a light-reflecting material impregnated in its fibers; or The two-layer structure includes a third surface layer, facing the outside of the vehicle, in which a third fiber member containing both a light-reflecting material and a light-absorbing material appears on the surface of the light-blocking member at a higher ratio than a fourth fiber member containing neither a light-reflecting material nor a light-absorbing material, and a fourth surface layer, facing the inside of the vehicle, in which a fourth fiber member containing neither a light-reflecting material nor a light-absorbing material appears on the surface of the light-blocking member at a higher ratio than a third fiber member containing neither a light-reflecting material nor a light-absorbing material, and the fourth surface layer, facing the inside of the vehicle, in which a fourth fiber member containing neither a light-reflecting material nor a light-absorbing material appears on the surface of the light-blocking member at a higher ratio than a third fiber member containing neither a light-reflecting material nor a light-absorbing material. Light, particularly infrared light, transmitted through the vehicle's window glass is first reflected by the light-reflecting material contained in the first surface layer (or third surface layer), thereby reducing the total amount of infrared light remaining inside the vehicle. Furthermore, infrared light not reflected by the light-reflecting material is absorbed by the light-absorbing material. Light transmitted through the first surface layer (or third surface layer) is further absorbed by the light-absorbing material contained in the second surface layer (or fourth surface layer), further reducing the amount of infrared light reaching passengers. The infrared reflection effect reduces the amount of infrared rays that enter the car, preventing the temperature inside the car from rising, and the double effect of infrared reflection and absorption reduces the scorching heat of sunlight felt by passengers. In addition, the first surface layer (third surface layer) is gray in color, which also has the effect of making it difficult to see inside the vehicle from outside. [Example]

[0033] The present invention will be described in more detail below with reference to examples and comparative examples. In the examples, the measurements of the various items were carried out according to the following methods.

[0034] Example 1 Two types of fibers with different properties were prepared: a first fiber member made of polyester fiber (110 dtex) containing titanium oxide (titanium oxide content: 4.0% by mass in the first fiber member), and a second fiber member made of polyester fiber (84 dtex) containing carbon black (carbon black content: 1.2% by mass in the second fiber member). The prepared first and second fiber components were knitted in an appropriate proportion using a 28 gauge / 4 bar tricot warp knitting machine, and then the fabric was immersed in a bath of 20% sol of water-soluble polyester hardener solution and passed through a drying oven at 180°C to set the fabric to the desired density, thereby producing the product of this invention (heat shielding screen 1) shown in Figure 1. In the heat shielding screen 1, the occurrence rate of the first fibrous members on the first surface was 35% or more, and the occurrence rate of the second fibrous members on the second surface was 50% or more.

[0035] <Example 2> Two types of fibers with different properties were prepared: a third fiber member made of polyester fiber (110 dtex) containing titanium oxide and carbon black (titanium oxide content: 4.0 mass% in the third fiber member / carbon black content: 1.2 mass% in the fourth fiber member), and a fourth fiber member made of polyester fiber (84 dtex) containing neither titanium oxide nor carbon black. The prepared third and fourth fiber components were knitted in appropriate amounts using a 28 gauge / 4 Bar tricot warp knitting machine, and then the fabric was immersed in a bath of 20% sol of water-soluble polyester-based hardener solution and passed through a drying oven at 180°C to set the fabric to the desired density, thereby producing a heat-shielding screen 2 similar to that of Example 1. In the heat shielding screen 2, the appearance rate of the third fibrous members on the third surface was 35% or more, and the appearance rate of the fourth fibrous members on the fourth surface was 50% or more.

[0036] <Comparative Example 1> For comparison, a mass-produced screen (28 gauge / 3 Bar tricot) shown in Figure 2 was prepared. This mass-produced product was made only of black dope-dyed yarn. The black dope-dyed yarn is polyester fiber containing carbon black, and has a thickness of 0.56 mm and a weight of 145 g / m. 2 It is a component for the same purpose with a density of 57 pieces / course and 28 pieces / well.

[0037] The heat insulating properties of the present invention (heat shielding screen 1) obtained in Example 1 and the mass-produced product of Comparative Example 1 were evaluated by the method described below. The results are shown in FIGS.

[0038] [Heat resistance test method] FIG. 3 shows a schematic diagram of a heat resistance testing apparatus 100 for conducting an insulation test using the infrared lamp 60°C method. The interior dimensions of a box 140 of this heat resistance testing apparatus 100 are length L1 = 54 cm, width (depth in FIG. 3) = 54 cm, and height H1 = 45 cm. An opening is formed in the front of the box, and a glass plate 120 is attached to this opening. An infrared lamp 130 is installed at a position 50 cm away from the glass plate 120, and temperature sensors 150 and 151 are installed at positions L2 = 46 cm and L3 = 4 cm from the back of the box, respectively.

[0039] Samples of the present invention and comparative products, each 50 cm wide and 40 cm high, were hung as test pieces 110 on the back side of the glass plate 120 of the heat resistance testing device 100, and the samples were irradiated with an infrared lamp 130 for 60 minutes at an ambient temperature of 25.0°C, and the temperature inside the box 140 was measured by temperature sensors 150 and 151.

[0040] The temperature measured by temperature sensor 150 at a position L2=46 cm from the back of the box corresponds to the temperature change in direct light, and the temperature measured by temperature sensor 151 at a position L3=4 cm corresponds to the temperature change inside the car.

[0041] [Measurement results] After 60 minutes of irradiation, the temperature change of the product of the present invention was about 2.3°C lower than that of the mass-produced product used as a comparison product. This confirmed that the product has excellent blocking effects against both direct sunlight and the temperature inside the car. [Explanation of symbols]

[0042] 100 Heat resistance test equipment 110 test specimens 120 Glass Plate 130 Infrared lamp 140 boxes 150, 151 Temperature sensor

Claims

1. A sheet-like or film-like light-shielding member for vehicles made of woven or knitted fibers, The fibers to be woven or knitted include a third fiber member containing a reflective material that reflects light and an absorbing material that absorbs the heat of light, and a fourth fiber member that does not contain a reflective material that reflects light or an absorbing material that absorbs the heat of light, a third surface that is woven or knitted so that the third fiber member appears on the surface of the light-shielding member at a higher ratio than the fourth fiber member, and that faces the outside of the vehicle; The fourth fiber member is woven or knitted so that it appears on the surface of the light-shielding member at a higher ratio than the third fiber member, and has a fourth surface facing the inside of the vehicle.

2. A sheet-like or film-like light-shielding member for vehicles made of woven or knitted fibers, The fibers to be woven or knitted are a third fiber member containing a reflective material that reflects light and an absorbing material that absorbs the heat of light, and a fourth fiber member that does not contain a reflective material that reflects light or an absorbing material that absorbs the heat of light, the light-shielding member is formed by weaving or knitting the third fibrous member and the fourth fibrous member into a sheet or film shape, a third surface that is woven or knitted so that the third fiber member appears on one surface of the light-shielding member at a higher ratio than the fourth fiber member, the one surface being directed toward the outside of the vehicle; A light-shielding element for a vehicle, having a fourth surface that is woven or knitted so that the fourth fiber member appears on the other surface of the light-shielding element at a higher ratio than the third fiber member, and the other surface is directed toward the inside of the vehicle.

3. The light-shielding member for a vehicle according to claim 1 or 2, wherein the light-shielding member is formed by warp knitting the third fiber member and the fourth fiber member.

4. The vehicle light-shielding member according to any one of claims 1 to 3, wherein an appearance rate of the third fiber member on the third surface is 35% or more.

5. The vehicle light-shielding member according to any one of claims 1 to 4, wherein an appearance rate of the third fiber member on the third surface is 50% or more.

6. The vehicle light-shielding member according to any one of claims 1 to 5, wherein the reflective member contains titanium oxide, and the content of the titanium oxide in the third fiber member is 2.0 mass% or more and 8.0 mass% or less.

7. The vehicle shading member according to any one of claims 1 to 6, wherein the absorption member contains a heat absorbing pigment, and the pigment content in the third fiber member is 0.5 mass% or more and 3.0 mass% or less.

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