Ceiling inner material for vehicle

Abstract

[Solution] Provided is a ceiling inner material (100) for a vehicle for covering, from a boarding space (10A) side, a body exterior plate (11) of a ceiling (10B) of an automobile (10), the material (100) comprising a stack (105) comprising a plurality of layers that have been stacked. At least one of said layers is a ceiling base material (120) containing heat radiation absorbing material M (10) for absorbing heat radiation R (1B).

Description

Vehicle ceiling interior materials

[0001] The present disclosure relates to a vehicle ceiling interior material.

[0002] When the exterior body panels of a vehicle ceiling are heated by sunlight, heat is radiated from the exterior body panels. When this heat reaches the passenger space, it raises the temperature of the passenger space, which can result in increased air conditioning energy consumption in the summer.

[0003] One known technology for addressing this issue is the vehicle ceiling material disclosed in Japanese Patent Application Laid-Open No. 2013-129308. In this technology, an infrared reflective layer is bonded to a backside fiber layer that reinforces the vehicle ceiling material. This allows the vehicle ceiling material to block heat radiated from the outer body panels of the ceiling.

[0004] However, since the infrared reflective layer of the vehicle ceiling material is made of an aluminum vapor deposition film (metal film), the above-mentioned conventional technology requires measures to prevent short circuits, such as providing the vehicle ceiling material with a protective layer that insulates the infrared reflective layer from the electrical wiring inside the vehicle.

[0005] There has been a need for a vehicle ceiling interior material that suppresses heat radiation reaching the passenger space from the outer body panel of the ceiling without using a metal film that reflects infrared rays.

[0006] The first disclosure relates to a vehicle ceiling interior material that covers an outer body panel of a vehicle ceiling from the passenger space side. The ceiling interior material has a laminated structure in which multiple layers are stacked from the outer body panel side toward the passenger space side. The laminated structure includes a thermal radiation absorbing layer that is a layer blended with a thermal radiation absorbing material that absorbs thermal radiation that reaches the layer.

[0007] According to the vehicle ceiling interior material of the first disclosure, the thermal radiation absorbing layer included in the laminated structure absorbs thermal radiation that attempts to enter the passenger space from the outer body panel of the ceiling with the thermal radiation absorbing material. This makes it possible to provide a vehicle ceiling interior material that can suppress thermal radiation that reaches the passenger space from the outer body panel of the ceiling without using a metal film that reflects thermal radiation.

[0008] In the vehicle ceiling interior material according to the second disclosure, the heat radiation from the heat radiation absorbing material is non-directional.

[0009] In the vehicle ceiling interior material according to the first disclosure, the temperature of the thermal radiation absorbing material in the thermal radiation absorbing layer rises as it absorbs thermal radiation. The thermal radiation absorbing material dissipates the absorbed thermal energy by thermal radiation. In the vehicle ceiling interior material according to the second disclosure, the thermal radiation from the thermal radiation absorbing material is not directional and is radiated in all directions. Therefore, a portion of the thermal radiation from the thermal radiation absorbing material is directed toward the outside of the passenger space. This allows the vehicle ceiling interior material to suppress the thermal radiation that reaches the passenger space.

[0010] In the vehicle ceiling interior material according to the third disclosure, the heat radiation absorbing layer is provided so as to cover the entire body outer panel from the passenger space side.

[0011] According to the vehicle ceiling interior material of the third disclosure, heat radiated from any part of the outer body panel of the ceiling passes through the laminated thermal radiation absorbing layer before reaching the passenger space, thereby making it possible for the vehicle ceiling interior material to suppress thermal radiation that would otherwise pass through the laminated thermal radiation absorbing layer and reach the passenger space.

[0012] In the vehicle ceiling interior material according to the fourth disclosure, the laminated structure includes a heat insulating layer having a thermal conductivity lower than that of the thermal radiation absorbing layer, and the heat insulating layer is provided at a position closer to the passenger space than the thermal radiation absorbing layer.

[0013] According to the vehicle ceiling interior material of the first disclosure, the temperature of the thermal radiation absorbing material in the thermal radiation absorbing layer rises as it absorbs thermal radiation. The thermal radiation absorbing material then transfers the absorbed thermal energy to the surroundings by thermal conduction. According to the vehicle ceiling interior material of the fourth disclosure, the insulating layer prevents heat from the thermal radiation absorbing layer from being transferred to the passenger space by thermal conduction. This allows the vehicle ceiling interior material to prevent heat from reaching the passenger space.

[0014] By having the above-mentioned configurations, the present disclosure can provide a vehicle ceiling interior material that suppresses heat radiation reaching the passenger space from the outer body panel of the ceiling without using a metal film that reflects infrared rays.

[0015] It is a schematic diagram of an automobile for explaining a vehicle ceiling interior material according to a first embodiment. It is an enlarged view of a part II in Fig. 1. It is a schematic diagram of an automobile for explaining a vehicle ceiling interior material according to a second embodiment. It is an enlarged view of a part IV in Fig. 3.

[0016] First Embodiment As shown in Fig. 1 , an automobile 10, which is one type of "vehicle," has a ceiling 10B. The ceiling 10B has a body outer panel 11. A vehicle ceiling interior material 100 according to a first embodiment of the present disclosure is provided on the ceiling 10B and covers the entire body outer panel 11 from the passenger space 10A side. As shown in Fig. 2 , the ceiling interior material 100 has a layer laminate structure 105 including a plurality of layers (for example, two layers). The layer laminate structure 105 has a ceiling base material 120 located on the body outer panel 11 side and a skin material 110 located on the passenger space 10A side.

[0017] The body outer panel 11 is expected to be heated to a maximum of approximately 120°C by sunlight R0. Therefore, thermal radiation R1 is radiated from the heated body outer panel 11. This thermal radiation R1 is mainly composed of infrared rays in the wavelength range of, for example, approximately 1 μm to 30 μm, and also contains electromagnetic waves with longer wavelengths, from far infrared rays to submillimeter waves (radio waves).

[0018] The cover material 110 is a layer that forms the design surface of the ceiling 10B of the automobile 10 (see FIG. 1 ) and improves its aesthetics. In this embodiment, the cover material 110 is formed of, for example, a layer of nonwoven fabric.

[0019] <Configuration of Ceiling Substrate> The ceiling substrate 120 is a layer that exhibits strength to maintain the shape of the vehicle ceiling interior material 100. For example, the ceiling substrate 120 is stronger than the other layers. The ceiling substrate may be composed of a mixed laminate of multiple layers, or may be composed of only a single layer. When the ceiling substrate is composed of a mixed laminate of multiple layers, the ceiling substrate may be composed of a layer of thermosetting resin (e.g., semi-rigid polyurethane foam) and a layer of glass fiber for ensuring strength. When the ceiling substrate is composed of only a single layer, the ceiling substrate may be, for example, a layer of a mat-like thermoplastic sheet material made of a mixture of glass fiber and polypropylene fiber. In these cases, the ceiling substrate may have enough strength to withstand deformation under a force equivalent to the weight of the vehicle ceiling interior material 100 itself.

[0020] As shown in FIG. 2 , the ceiling base material 120 contains a thermal radiation absorbing material M10. The thermal radiation absorbing material M10 absorbs thermal radiation R1B, which is a portion of the thermal radiation R1 that reaches the interior of the ceiling base material 120 from the outer body panel 11 of the ceiling 10B. As a result, the ceiling base material 120 suppresses thermal radiation R1A, which is part of the thermal radiation R1 that passes through the ceiling base material and reaches the passenger space 10A. In other words, the ceiling base material 120 corresponds to the "thermal radiation absorbing layer" in this disclosure. In this embodiment, carbon black, which can absorb a wide range of electromagnetic waves in the ultraviolet to infrared wavelength range, is used as the thermal radiation absorbing material M10. The thermal radiation absorbing material M10 is, for example, granular.

[0021] The thermal radiation absorbing material M10 may be blended into any part of the ceiling base material 120. If the ceiling base material is composed of a laminate of a thermoplastic resin layer and a glass fiber layer, the thermal radiation absorbing material can be blended into the thermoplastic resin layer. If the ceiling member is composed of only a single foamed resin layer, the thermal radiation absorbing material can be blended into the foamed resin that makes up the foamed resin layer. In Figure 2, the thermal radiation absorbing material M10 is depicted as being uniformly dispersed throughout the ceiling base material 120.

[0022] In this embodiment, the ceiling base material 120 is provided so as to cover the entire outer body panel 11 of the ceiling 10B from the passenger space 10A side. Therefore, heat radiated from any part of the outer body panel 11 of the ceiling 10B passes through the ceiling base material 120 before reaching the passenger space 10A.

[0023] The thermal radiation absorption material M10 absorbs the above-mentioned thermal radiation R1B, causing the temperature to rise. The thermal radiation absorption material M10, whose temperature has risen, dissipates the absorbed thermal energy as thermal radiation R2. Here, the thermal radiation R2 from the thermal radiation absorption material M10 is non-directional. In other words, the thermal radiation R2 from the thermal radiation absorption material M10 is radiated in all directions.

[0024] <Function of Vehicle Ceiling Interior Material> Next, the function of the vehicle ceiling interior material 100 according to the embodiment described above will be described mainly with reference to FIG.

[0025] In the automobile 10, when the outer body panel 11 of the ceiling 10B is heated by sunlight R0, thermal radiation R1 is generated from the outer body panel 11 toward the interior of the automobile 10. This thermal radiation R1 attempts to pass through the ceiling base material 120 and enter the passenger space 10A. However, a portion of the thermal radiation R1, thermal radiation R1B, is absorbed by the thermal radiation absorber M10. Therefore, only a portion of the thermal radiation R1A passes through the ceiling base material 120 and reaches the passenger space 10A.

[0026] Furthermore, the temperature of the thermal radiation absorbing material M10 in the ceiling base material 120 rises as it absorbs the thermal radiation R1B. As a result, the thermal radiation absorbing material M10, whose temperature has risen by absorbing the thermal radiation R1B, dissipates the absorbed thermal energy as thermal radiation R2. Here, the thermal radiation R2 from the thermal radiation absorbing material M10 is not directional and is radiated in all directions. Therefore, only a portion of the thermal radiation R2 from the thermal radiation absorbing material M10, namely thermal radiation R2A, is directed toward the passenger space 10A, while the remaining thermal radiation R2B is directed toward the body outer panel 11 of the ceiling 10B or toward the interior of the ceiling base material 120.

[0027] Due to these effects, the vehicle ceiling interior material 100 suppresses thermal radiation (thermal radiation R1A and thermal radiation R2A) from sunlight R0 that attempts to enter the passenger space 10A, thereby reducing the impact of this thermal radiation on the temperature rise in the passenger space 10A.

[0028] <Effects> According to the above-described vehicle ceiling interior material 100, the ceiling base material 120 included in the laminated structure 105 absorbs the thermal radiation R1B that attempts to enter the passenger space 10A from the body outer panel 11 of the ceiling 10B using the thermal radiation absorbing material M10. This makes it possible to provide a vehicle ceiling interior material 100 that can suppress the thermal radiation R1A that reaches the passenger space 10A from the body outer panel 11 of the ceiling 10B without using a metal film that reflects the thermal radiation.

[0029] Furthermore, according to the vehicle ceiling interior material 100, the temperature of the thermal radiation absorbing material M10 in the ceiling base material 120 rises after absorbing the thermal radiation R1B. As a result, the thermal radiation absorbing material M10 dissipates the absorbed thermal energy as thermal radiation R2. The thermal radiation R2 from the thermal radiation absorbing material M10 is not directional and is radiated in all directions. As a result, part of the thermal radiation R2 from the thermal radiation absorbing material M10 is directed toward the outside of the passenger space 10A. This allows the vehicle ceiling interior material 100 to suppress the thermal radiation R2A from reaching the passenger space 10A.

[0030] Furthermore, according to the vehicle ceiling interior material 100, when heat radiated from any part of the body outer panel 11 of the ceiling 10B attempts to reach the passenger space 10A, it passes through the ceiling base material 120 of the laminated structure 105. This allows the vehicle ceiling interior material 100 to suppress thermal radiation R1A that passes through the ceiling base material 120 of the laminated structure 105 and reaches the passenger space 10A.

[0031] According to each configuration of the vehicle ceiling interior material 100, it is possible to provide a vehicle ceiling interior material 100 that suppresses thermal radiation (thermal radiation R1A and thermal radiation R2A) that reaches the passenger space 10A from the body outer panel 11 of the ceiling 10B without using a metal film that reflects infrared rays.

[0032] Second Embodiment Next, the configuration of a vehicle ceiling interior material 600 according to a second embodiment of the present disclosure will be described with reference to Fig. 4. The vehicle ceiling interior material 600 according to the second embodiment is a modified version of the vehicle ceiling interior material 100 according to the first embodiment. Therefore, for components common to the respective components of the vehicle ceiling interior material 100 according to the first embodiment, reference numerals obtained by adding "500" to the reference numerals assigned to the respective components of the vehicle ceiling interior material 100 according to the first embodiment are assigned to correspond to the respective components, and detailed description thereof will be omitted.

[0033] A vehicle ceiling interior material 600 according to a second embodiment of the present disclosure is provided on a ceiling 60B of an automobile 60, as shown in Fig. 3. The ceiling interior material 600 covers the entire body outer panel 61 of the ceiling 60B from the passenger space 60A side. As shown in Fig. 4, the vehicle ceiling interior material 600 has a laminated structure 605 including a plurality of layers. The laminated structure 605 has a ceiling base material 620 located on the body outer panel 61 side and a skin material 610 located on the passenger space 60A side.

[0034] <Configuration of ceiling base material> In the ceiling base material 620, five layers are laminated in this order from the body outer panel 61 side of the ceiling 60B toward the passenger space 60A side: a protective layer 621, a thermal radiation absorption layer 622, an absorption layer adhesive layer 625, a heat insulating layer 623, and a skin adhesive layer 624. In this embodiment, the layers that make up the ceiling base material 620 are adhered by an appropriately selected method.

[0035] <Configuration of Protective Layer> The protective layer 621 is a layer of nonwoven fabric made of entangled fibers mainly made of thermoplastic resin such as polyester. This protective layer 621 is a buffer material sandwiched between the thermal radiation absorption layer 622 and the body outer panel 61 of the ceiling 60B. In this embodiment, the fiber density of the nonwoven fabric is uniform per unit area.

[0036] <Configuration of Thermal Radiation Absorption Layer> The thermal radiation absorption layer 622 is a film-like layer made of a thermoplastic resin (e.g., polyamide) blended with a thermal radiation absorption material M10. The thermal radiation absorption material M10 blended in the thermal radiation absorption layer 622 is the same as the thermal radiation absorption material M10 used in the vehicle ceiling interior material 100 according to the first embodiment. That is, the thermal radiation absorption material M10 increases in temperature by absorbing the thermal radiation R1B that reaches the thermal radiation absorption layer 622. Furthermore, the thermoplastic resin constituting the thermal radiation absorption layer 622 remains stable against a temperature increase (e.g., a temperature increase up to 120°C) of the same magnitude as the temperature increase caused by the absorption of thermal radiation R1B by the thermal radiation absorption material M10.

[0037] In this embodiment, the thermal radiation absorbing material M10 is blended in an amount of, for example, 1 to 10% by weight relative to the thermoplastic resin that is the raw material of the thermal radiation absorbing layer 622. The thermal radiation absorbing layer 622 is formed by inflation molding (a method of obtaining a tubular resin molded product by extruding molten resin into a cylindrical shape and introducing cooling air into the cylinder) of the thermoplastic resin blended with the thermal radiation absorbing material M10. However, the thermal radiation absorbing layer 622 may also be formed by, for example, cast molding (a method of obtaining a strip-shaped resin molded product by extruding molten resin into a strip-shaped shape and bringing it into contact with a cooling roll).

[0038] The thermal radiation absorbing layer 622 is airtight. Therefore, sound propagates between the outer body panel 61 of the ceiling 60B and the passenger space 60A via the thermal radiation absorbing layer 622. The thermal radiation absorbing layer 622 has a density greater than that of air (not shown), so sound pressure is suppressed. In other words, the thermal radiation absorbing layer 622 has the function of insulating sound between the outer body panel 61 of the ceiling 60B and the passenger space 60A.

[0039] Furthermore, the heat radiation absorption layer 622, due to its airtightness, prevents air (not shown) in the passenger space 60A from flowing into the body outer panel 61 of the ceiling 60B.

[0040] <Configuration of the Heat Insulating Layer> The heat insulating layer 623 is configured by sandwiching a layer of plastic foam (e.g., semi-rigid polyurethane with a heat resistance temperature of 120°C or higher) containing a plurality of bubbles M20 between layers of reinforcing fiber (not shown, e.g., glass fiber) on both the front and back sides. The reinforcing fiber layers provide the heat insulating layer 623 with the strength to maintain the shape of the vehicle ceiling interior material 600. This heat insulating layer 623 is located closer to the passenger space 60A than the thermal radiation absorbing layer 622. The heat insulating layer 623 is configured so that its thermal conductivity is smaller than both the thermal conductivity of the thermal radiation absorbing layer 622 and the thermal conductivity of the skin material 610.

[0041] <Configuration of Covering Material Adhesive Layer> The covering material adhesive layer 624 is a film-like layer made of a thermoplastic resin (e.g., polyamide). The covering material adhesive layer 624 acts as a bridge for bonding the covering material 610 to the ceiling base material 620. The covering material adhesive layer 624 can be formed by the same method as the method for forming the thermal radiation absorption layer 622 described above.

[0042] <Configuration of Absorbing Layer Adhesive Layer> The absorbing layer adhesive layer 625 is a layer having exactly the same configuration as the skin material adhesive layer 624, and serves as a bridge for bonding the heat insulating layer 623 to the thermal radiation absorbing layer 622. The method for forming the absorbing layer adhesive layer 625 is the same as the method for forming the skin material adhesive layer 624.

[0043] <Function of Vehicle Ceiling Interior Material> Next, the function of the vehicle ceiling interior material 600 according to the embodiment described above will be described mainly with reference to FIG.

[0044] In automobile 60, when the outer body panel 61 of the ceiling 60B is heated by sunlight R0, thermal radiation R1 is generated from this outer body panel 61 toward the interior of automobile 60. This thermal radiation R1 attempts to pass through the ceiling base material 620 and enter the passenger space 60A. However, a portion of the thermal radiation R1, thermal radiation R1B, is absorbed by the thermal radiation absorption material M10. Therefore, only a portion of the thermal radiation R1A passes through the ceiling base material 620 and reaches the passenger space 60A.

[0045] Furthermore, the temperature of the thermal radiation absorbing material M10, which has absorbed the thermal radiation R1B in the thermal radiation absorbing layer 622, rises. Then, the thermal radiation absorbing material M10, whose temperature has risen by absorbing the thermal radiation R1B, dissipates the absorbed thermal energy as thermal radiation R2. Here, the thermal radiation R2 from the thermal radiation absorbing material M10 is non-directional and is radiated in all directions. Therefore, only a portion of the thermal radiation R2 from the thermal radiation absorbing material M10, namely, thermal radiation R2A, is directed toward the passenger space 60A, while the remaining thermal radiation R2B is directed toward the body outer panel 61 of the ceiling 60B or toward the interior of the thermal radiation absorbing layer 622.

[0046] Due to these actions, the vehicle ceiling interior material 600 suppresses the thermal radiation (thermal radiation R1A and thermal radiation R2A) from sunlight R0 that attempts to enter the passenger space 60A, thereby reducing the impact of this thermal radiation on the temperature rise in the passenger space 60A.

[0047] Furthermore, in the thermal radiation absorption layer 622, the thermal radiation absorption material M10 that absorbs the thermal radiation R1B from the body outer panel 61 of the ceiling 60B increases in temperature. The thermal radiation absorption material M10, whose temperature has increased, transfers the absorbed thermal energy to the surroundings by thermal conduction T1. Because this thermal conduction T1 has no directionality, the heat tends to move in all directions, including toward the body outer panel 61 and the passenger space 60A. In contrast, the heat insulating layer 623, due to its low thermal conductivity, prevents the heat by thermal conduction T1 from being transferred to the passenger space 60A (see the state in FIG. 4 where the heat conduction T1 transferred to the passenger space 60A is indicated by a dashed arrow within the heat insulating layer 623).

[0048] Furthermore, sound propagates between the outer body panel 61 of the ceiling 60B and the passenger space 60A via air (not shown) and the thermal radiation absorbing layer 622. This suppresses the sound pressure during sound propagation between the outer body panel 61 of the ceiling 60B and the passenger space 60A.

[0049] Furthermore, the heat radiation absorption layer 622 prevents air (not shown) in the passenger space 60A from flowing toward the body outer panel 61. This prevents dust (not shown) in the passenger space 60A from flowing together with the air into the vehicle ceiling interior material 600 and adhering to the skin material 610.

[0050] <Effects> According to the vehicle ceiling interior material 600 described above, the temperature of the thermal radiation absorbing material M10 in the thermal radiation absorbing layer 622 rises after absorbing the thermal radiation R1B. The thermal radiation absorbing material M10 then transfers the absorbed thermal energy to the surroundings by thermal conduction T1. Here, the heat insulating layer 623 prevents the heat from the thermal radiation absorbing layer 622 from being transferred to the passenger space 60A by thermal conduction T1 (see the thermal conduction T1 depicted by the dashed arrow in FIG. 4). This allows the vehicle ceiling interior material 600 to prevent the heat from reaching the passenger space 60A.

[0051] According to each configuration of the vehicle ceiling interior material 600, it is possible to provide a vehicle ceiling interior material 600 that suppresses thermal radiation (thermal radiation R1A and thermal radiation R2A) that reaches the passenger space 60A from the body outer panel 61 of the ceiling 60B without using a metal film that reflects infrared rays.

[0052] <Other Embodiments> The above-described embodiments have been used to describe the modes for carrying out the present disclosure. However, it will be apparent to those skilled in the art that various substitutions, modifications, and changes are possible without departing from the scope of the present invention. In other words, the modes for carrying out the scope of the present invention may include all substitutions, modifications, and changes that do not depart from the spirit and purpose of the claims appended hereto. For example, the following various modes can be implemented as modes for carrying out the present disclosure.

[0053] In the present disclosure, the thermal radiation absorber is not limited to carbon black, and any appropriately selected infrared absorbing material can be used. Examples of such infrared absorbing materials include tungsten oxide microparticles, composite tungsten oxide microparticles, diimonium compounds, aminium compounds, phthalocyanine compounds, organometallic complexes, cyanine compounds, azo compounds, polymethine compounds, quinone compounds, diphenylmethane compounds, and triphenylmethane compounds. In addition, in the present disclosure, multiple types of thermal radiation absorbers with different absorption wavelengths may be used in combination. In this case, some of the thermal radiation absorbers may be electromagnetic wave absorbers that effectively absorb electromagnetic waves from far infrared rays to submillimeter waves (radio waves).

[0054] In the present disclosure, the thermal radiation absorbing material may have directional thermal radiation. Such a thermal radiation absorbing material can be obtained, for example, by forming the thermal radiation absorbing material into a flat particle shape. Even in this case, by blending the thermal radiation absorbing material in an irregular orientation in the thermal radiation absorbing layer, the thermal radiation from the entire thermal radiation absorbing layer can be made non-directional.

[0055] In the vehicle ceiling interior material according to the second embodiment, the thermal radiation absorbing material is not limited to being blended into the layer that provides airtightness between the protective layer and the insulating layer. That is, in the vehicle ceiling interior material, the thermal radiation absorbing material may be blended into any of the protective layer, the absorbing layer adhesive layer, the insulating layer, and the surface material adhesive layer. Here, when the protective layer is blended with the thermal radiation absorbing material, a method can be employed in which fibers are produced from a resin material blended with the thermal radiation absorbing material, and a nonwoven fabric produced from these fibers is used as the protective layer. Furthermore, when the absorbing layer adhesive layer or the surface material adhesive layer is blended with the thermal radiation absorbing material, a method can be employed in which the adhesive layer is produced from a resin material blended with the thermal radiation absorbing material. Furthermore, when the insulating layer is blended with the thermal radiation absorbing material, a method can be employed in which the thermal radiation absorbing material is previously blended into the raw material of the insulating layer (e.g., polyol or polyisocyanate when the insulating layer is made of urethane resin).

[0056] In the vehicle ceiling interior material according to the second embodiment, the specific materials of the thermal radiation absorption layer and the adhesive layer are not limited to those described in the second embodiment. That is, the materials of the thermal radiation absorption layer and the adhesive layer may be polypropylene or polyethylene terephthalate. Similarly, the specific material of the heat insulating layer is not limited to those described in the second embodiment. That is, the material of the heat insulating layer may be modified polyphenylene oxide.

Claims

1. A vehicle ceiling interior material that covers the outer body panel of the ceiling of a vehicle from the passenger space side, the vehicle ceiling interior material having a laminated structure with a plurality of laminated layers, at least one of the plurality of layers being a thermal radiation absorbing layer that contains a thermal radiation absorbing material that absorbs thermal radiation.

2. A vehicle ceiling interior material according to claim 1, wherein the thermal radiation from the thermal radiation absorbing material is non-directional.

3. A vehicle ceiling interior material according to claim 1 or 2, wherein the heat radiation absorption layer is provided so as to cover the entire body outer panel from the passenger space side.

4. A vehicle ceiling interior material according to any one of claims 1 to 3, wherein at least one of the plurality of layers is a heat insulating layer having a thermal conductivity lower than that of the thermal radiation absorbing layer, and the heat insulating layer is provided at a position closer to the passenger space than the thermal radiation absorbing layer.

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