Cooling interior materials

Abstract

To easily provide cooling and cooling functions to vehicles that do not have a cooling function. [Solution] The cooling interior material 10 comprises a bottom plate 20 made of a hollow structure made of synthetic resin, a plate-shaped heat insulating material 30 provided to cover one main surface of the bottom plate 20, and a lid plate 40 made of a hollow structure made of synthetic resin and provided to cover the main surface of the heat insulating material 30 opposite to the bottom plate 20, and the heat insulating material 30 is provided with a recess 31 that opens toward the lid plate 40 and can accommodate the cooling material.

Description

Technical Field

[0001] The present invention relates to an interior material for cooling.

Background Art

[0002] A cold storage vehicle for transporting foods and the like in a cooled state is known. Patent Document 1 describes an invention related to the floor structure of the loading platform of a truck used as a refrigerated cold storage vehicle. The floor structure is composed of a floor panel in which a stainless steel floor covering for waterproofing, a veneer board as a rigid material, a heat insulating material made of foamed resin, and an aluminum sheet for waterproofing are integrated.

[0003] The truck described in Patent Document 1 is a vehicle dedicated to cooling and cold storage in which the loading platform is formed as a box-shaped refrigerated cold storage independent of the passenger space. A refrigerator is arranged at the upper part of the front wall, and the cargo in the cargo compartment can be cooled and kept cold by the cold air directly introduced from the refrigerator.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, due to the influence of global warming and the like, not only the transportation of cooled foods and the like, but also goods that usually do not need to be cooled may be exposed to high temperatures and have unfavorable effects. Therefore, it is conceivable to give a cooling function not only to vehicles dedicated to cooling and cold storage such as refrigerated cold storage vehicles and refrigerated cold storage vehicles, but also to general vehicles that do not have a cooling function. However, the floor panel described in Patent Document 1 does not have a cooling function by itself.

[0006] Furthermore, the use of plywood to provide rigidity tends to increase the overall weight. Installing this floor panel in a vehicle while simultaneously adding a cooling function is not easy. There is a need for a cooling interior material that can easily provide both cooling and insulation functions to a vehicle. [Means for solving the problem]

[0007] To solve the above problems, the cooling interior material of the present invention comprises a bottom plate made of a hollow structure made of synthetic resin, a plate-shaped insulating material provided to cover one main surface of the bottom plate, and a lid plate made of a hollow structure made of synthetic resin and provided to cover the main surface of the insulating material opposite to the bottom plate, wherein the insulating material is provided with a recess that opens to the lid plate side and can accommodate a cooling material.

[0008] According to the above configuration, the cooling interior material consists of a plate-shaped insulating material sandwiched between hollow structures made of synthetic resin. The insulating material has a recess that opens towards the lid plate side of the hollow structure. Therefore, by housing the cooling material in the recess, the surrounding objects can be cooled by the cold air from the cooling material. For example, in the rear cargo compartment of a van-type vehicle used for transporting goods, if the cooling interior material is attached to the floor or walls and the cooling material is housed inside, the cargo compartment can be cooled and kept cool.

[0009] Furthermore, the hollow structure made of synthetic resin is lightweight yet possesses adequate rigidity. Therefore, it is easy to install in the cargo area. It can easily provide cooling and insulation functions to vehicles that lack them.

[0010] In the above configuration, it is preferable that the cover plate is configured to accommodate the coolant in the recess while attached to the heat insulating material. With the above configuration, it is easy to replace the coolant in the recess that opens on the lid plate side. By replacing the coolant as needed, the cooling function can be maintained.

[0011] In the above configuration, it is preferable that the lid plate comprises a lid plate body made of a hollow structure and an aluminum layer that is joined to the main surface of the lid plate body opposite to the heat insulating material to form the outer surface.

[0012] With the above configuration, even if sunlight enters the vehicle's cargo compartment, it is reflected by the aluminum layer. This suppresses the temperature rise inside the cargo compartment caused by sunlight. In addition, because the aluminum layer has good thermal conductivity, the cooling effect of the coolant contained in the recess is easily transmitted to the entire surface of the lid plate of the cooling interior material.

[0013] In the above configuration, it is preferable that the cover plate comprises a cover plate body made of a hollow structure and aluminum layers joined to each of the two main surfaces of the cover plate body. When aluminum layers are bonded to both sides of the lid plate, the cooling effect of the coolant is more easily transmitted across the entire surface of the lid plate.

[0014] In the above configuration, it is preferable that the depth of the recess is 50% or more of the thickness of the thermal insulation material. The recesses formed in the insulation material and opening to the lid plate do not penetrate to the bottom plate. When the coolant is housed in the recesses, the portion of the coolant on the bottom plate side is covered by the insulation material. Therefore, the insulation effect is well maintained. On the other hand, if the thickness of the bottom plate is increased to maintain a good insulation effect, the overall thickness of the insulation material increases. In this respect, if the depth of the recesses is 50% or more of the thickness of the insulation material, it is possible to maintain a good insulation effect while keeping the thickness of the insulation material down. This also allows for a reduction in the thickness of the cooling interior material itself, thus providing more space in the cargo area.

[0015] In the above configuration, it is preferable that the cover plate is formed by arranging a plurality of divided cover plates side by side in the direction in which the main surface of each divided cover plate extends. The above configuration allows for a smaller size for each segmented cover plate. Therefore, it is easier to move each segmented cover plate when replacing the coolant. Replacing the coolant in the recessed opening on the cover plate side is also easy.

[0016] In the above configuration, it is preferable that the adjacent divided cover plates are connected via a hinge portion. According to the above configuration, if one of the adjacent divided cover plates is rotated at the hinge portion, the recess of the heat insulating material can be exposed. When replacing the coolant, it is easy to move each divided cover plate, and it is easy to replace the coolant in the recess.

Effects of the Invention

[0017] According to the present invention, a cooling function and a cold storage function can be easily imparted to a vehicle that does not have a cooling function.

Brief Description of the Drawings

[0018] [Figure 1] It is a partially broken perspective view of a vehicle equipped with the interior material for cooling of the present embodiment. [Figure 2] It is a perspective view of the interior material for cooling. [Figure 3] It is a sectional view taken along line A-A of FIG. 2 and an enlarged view of the hollow structure constituting the cover plate. [Figure 4] (a) to (d) are diagrams for explaining a modification example of the cover plate of the interior material for cooling. [Figure 5] It is a diagram for explaining a modification example of the interior material for cooling. [Figure 6] It is a diagram for explaining a modification example of the interior material for cooling. [Figure 7] It is a diagram for explaining the hollow plate material constituting the cover plate and the bottom plate. (a) is a sectional perspective view of the hollow plate material. (b) is a schematic sectional view taken along line α-α of (a). (c) is a schematic sectional view taken along line β-β of (a). [Figure 8] It is a diagram for explaining a manufacturing method of the hollow plate material. (a) is a partial perspective view of the sheet material constituting the core layer. (b) is a partial perspective view showing a state during folding of the sheet material constituting the core layer. (c) is a partial perspective view showing a state where the sheet material constituting the core layer is folded.

Modes for Carrying Out the Invention

[0019] As shown in Figure 1, the cooling interior material 10 of this embodiment (hereinafter referred to as interior material 10) is applied to a van-type vehicle 1 capable of carrying and transporting cargo. At the front of the vehicle 1, a passenger compartment 4 is formed, in which a driver's seat 2 and a passenger seat 3 are arranged side by side in the width direction of the vehicle. At the rear of the vehicle 1, a cargo compartment 6 is formed, with a cargo bed 5 provided below. The passenger compartment 4 and the cargo compartment 6 are in communication via the space above the driver's seat 2 and the passenger seat 3, as well as the side spaces. Side windows 7 are formed on the sides of the cargo compartment 6 in the vehicle 1. A back window 9 is formed on the back door 8 at the rear of the cargo compartment 6. Figure 1 shows the interior material 10 being used by being placed on the cargo bed 5 of the vehicle 1.

[0020] <Regarding interior material 10> As shown in Figures 1 and 2, the interior material 10 of this embodiment is formed in the shape of a rectangular plate with a length of approximately 1220 mm in the vehicle width direction, a length of approximately 1800 mm in the vehicle longitudinal direction, and a thickness of approximately 51 mm when placed on the cargo bed 5. The length in the vehicle width direction and the length in the vehicle longitudinal direction are set to cover almost the entire cargo bed 5. The four corners 13 of the interior material 10 are chamfered.

[0021] As shown in Figures 2 and 3, the interior material 10 of this embodiment comprises a bottom plate 20 made of a hollow structure of synthetic resin, a plate-shaped heat insulating material 30 made of resin foam, and a lid plate 40 made of a hollow structure of synthetic resin. In this embodiment, the bottom plate 20 and the heat insulating material 30 are joined together via an adhesive layer (not shown). The heat insulating material 30 and the lid plate 40 are not joined together, and the lid plate 40 is placed on top of the heat insulating material 30.

[0022] The base plate 20, the insulation material 30, and the cover plate 40 have the same length in both the vehicle width direction and the vehicle longitudinal direction. The insulation material 30 is joined to cover the entire main surface of one of the base plates 20. The cover plate 40 is placed on top of the insulation material 30 so as to cover the entire main surface on the side opposite to the base plate 20.

[0023] <Regarding the base plate 20 and lid plate 40> The base plate 20 is formed by cutting a hollow plate material 50 made of synthetic resin, which will be described later, to the above size. The hollow plate material 50 has a hollow structure in which multiple cells S are arranged in parallel inside. The base plate 20 is a hollow structure consisting only of the hollow plate material 50. The thickness of the base plate 20, that is, the thickness of the hollow plate material 50, is approximately 5 mm.

[0024] As shown in Figure 2, the cover plate 40 of this embodiment is formed by arranging two divided cover plates 40a and 40b of the same size side by side in the direction in which their respective main surfaces extend. The cover plate 40 is divided into two parts, the divided cover plate 40a and 40b, at an intermediate position in the short-side direction of the cover plate 40.

[0025] The right side of Figure 3 shows an enlarged view of the hollow structure that makes up the lid plate 40. The divided lid plates 40a and 40b are made of the same hollow plate material 50 as the bottom plate 20 and a pair of aluminum layers 41 and 42. The lid plate 40 is a hollow structure made of the hollow plate material 50 and the aluminum layers 41 and 42. The lid plate body as referred to in the claims is the hollow plate material 50 that makes up the lid plate 40.

[0026] As shown in Figure 2, the two divided lid plates 40a and 40b are joined together by tape (not shown) with their edges butted together. When joined, the butted edges form a hinge portion 43. The hinge portion 43 extends in the longitudinal direction of the lid plate 40. When the lid plate 40 is placed on the insulation material 30, with the divided lid plates 40a and 40b joined together, it is possible to lift only one of the divided lid plates 40a or only the other divided lid plate 40b.

[0027] As shown on the right side of Figure 3, the lid plate 40 (divided lid plates 40a and 40b) is formed by joining an aluminum layer 41 to one main surface of a hollow plate material 50 and an aluminum layer 42 to the other main surface. The aluminum layers 41 and 42 are joined to the entire surface of the hollow plate material 50 via an adhesive layer (not shown). The thickness of the lid plate 40 is approximately 6 mm. For convenience, the aluminum layer 41 is located on the surface side of the interior material 10, and the aluminum layer 42 is located on the side of the insulation material 30.

[0028] Nonwoven fabric tape (not shown) is joined around the entire circumference of the edges of the divided cover plates 40a and 40b. The nonwoven fabric tape is joined so as to cover the ends of the hollow plate material 50 and the aluminum layers 41 and 42. The ends of the divided cover plates 40a and 40b are protected by the nonwoven fabric tape.

[0029] <About Hollow Sheet Material 50> As shown in Figure 7(a), the hollow plate material 50 is composed of a thermoplastic resin core layer 51 in which a plurality of cells S are arranged in parallel inside, and thermoplastic resin skin layers 52 and 53 that are joined to cover the entire core layer 51 on both main surfaces of the core layer 51.

[0030] As shown in Figures 7(b) and (c), the core layer 51 is formed by folding a single thermoplastic resin sheet material 100 that has been molded into a predetermined shape. The core layer 51 consists of an upper wall portion 54, a lower wall portion 55, and a side wall portion 56 erected between the upper wall portion 54 and the lower wall portion 55 to divide the cell S into a hexagonal prism shape. As will be explained below, the upper wall portion 54 and the lower wall portion 55 of the core layer 51 have a mixed structure of single-layer and double-layer structures, but in Figure 7(a), the upper wall portion 54 and the lower wall portion 55 of the core layer 51 are shown as a single-layer structure. Also, the right-hand figure of Figure 3 shows a portion of the first cell S1 having a double-layer upper wall portion 54 and a single-layer lower wall portion 55.

[0031] As shown in Figures 7(b) and (c), the cells S partitioned within the core layer 51 include a first cell S1 and a second cell S2 with different configurations. As shown in Figure 7(b), in the first cell S1, a two-layer upper wall 54 is provided above the side wall 56. Each layer of this two-layer upper wall 54 is joined to the others. In addition, an opening (not shown) is formed in the two-layer upper wall 54 due to the thermal shrinkage of the thermoplastic resin during the molding of the core layer 51. In the first cell S1, a single-layer lower wall 55 is provided below the side wall 56.

[0032] On the other hand, as shown in Figure 7(c), in the second cell S2, a single-layer upper wall 54 is provided above the side wall 56. Also in the second cell S2, a two-layer lower wall 55 is provided below the side wall 56. Each layer of this two-layer lower wall 55 is joined to the others. An opening (not shown) is formed in the two-layer lower wall 55 due to the thermal shrinkage of the thermoplastic resin during the molding of the core layer 51.

[0033] Furthermore, as shown in Figures 7(b) and (c), the spaces between adjacent first cells S1 and adjacent second cells S2 are separated by two-layer sidewalls 56. These two-layer sidewalls 56 have portions in the center of the core layer 51 in the thickness direction that are not heat-welded to each other. Therefore, the internal space of each cell S in the core layer 51 is in communication with the internal space of other cells S via the spaces between the two-layer sidewalls 56.

[0034] As shown in Figure 7(a), the first cells S1 are arranged in rows along the X direction. Similarly, the second cells S2 are arranged in rows along the X direction. The rows of first cells S1 and second cells S2 are arranged alternately in the Y direction, which is perpendicular to the X direction. These first cells S1 and second cells S2 form a honeycomb structure as a whole in the core layer 51.

[0035] The thermoplastic resins constituting the core layer 51 and the skin layers 52 and 53 may be any conventionally known thermoplastic resin, such as polypropylene resin, polyamide resin, polyethylene resin, acrylonitrile-butadiene-styrene copolymer resin, acrylic resin, or polybutylene terephthalate resin. In this embodiment, the core layer 51 and the skin layers 52 and 53 are made of polypropylene resin. It is preferable that the thermoplastic resin constituting the core layer 51 and the thermoplastic resin constituting the skin layers 52 and 53 are made of the same material. In this embodiment, the thickness of the skin layer 52 and the skin layer 53 are the same.

[0036] Next, we will explain how to manufacture the hollow plate material 50. As shown in Figure 8, the hollow plate material 50 is manufactured by forming a core layer 51 from a single sheet material 100 and then joining skin layers 52 and 53 to the core layer 51.

[0037] As shown in Figure 8(a), the sheet material 100 is formed by molding a single sheet of thermoplastic resin into a predetermined shape. The sheet material 100 has strip-shaped planar regions 110 and bulging regions 120 arranged alternately in the longitudinal direction (X direction) of the sheet material 100. In the bulging region 120, a first bulge portion 121, which has a downward groove-like cross-section consisting of an upper surface and a pair of side surfaces, is formed over the entire length of the bulging region 120 in the direction in which it extends (Y direction). Preferably, the angle between the upper surface and the side surface of the first bulge portion 121 is 90 degrees, and as a result, the cross-sectional shape of the first bulge portion 121 is a downward U-shape. Furthermore, the width of the first bulge portion 121 (length in the short direction of the upper surface) is set to be equal to the width of the planar region 110 and twice the bulge height of the first bulge portion 121 (length in the short direction of the side surface).

[0038] Furthermore, the bulging region 120 has multiple second bulges 122, each having a trapezoidal cross-section obtained by bisecting a regular hexagon with its longest diagonal, formed perpendicular to the first bulge 121. The bulge height of the second bulges 122 is set to be equal to the bulge height of the first bulge 121. The spacing between adjacent second bulges 122 is equal to the width of the upper surface of the second bulge 122.

[0039] The first bulge 121 and the second bulge 122 are formed by utilizing the plasticity of the sheet to partially bulge the sheet upward. Furthermore, the sheet material 100 can be formed from a single sheet using well-known molding methods such as vacuum forming or compression molding.

[0040] As shown in Figures 8(a) and (b), the core layer 51 is formed by folding the sheet material 100, configured as described above, along boundary lines P and Q. Specifically, the sheet material 100 is valley-folded at boundary line P between the planar region 110 and the bulging region 120, and mountain-folded at boundary line Q between the upper surface and side surface of the first bulging portion 121, thereby compressing it in the X direction. Then, as shown in Figures 8(b) and (c), the upper surface and side surface of the first bulging portion 121 overlap, and the end surface of the second bulging portion 122 overlaps with the planar region 110, thereby forming a prismatic compartment 130 extending in the Y direction for each bulging region 120. As these compartments 130 are continuously formed in the X direction, a hollow plate-like core layer 51 is formed.

[0041] As described above, when the sheet material 100 is compressed, the upper wall portion 54 of the core layer 51 is formed by the upper surface and side surface of the first bulge portion 121, and the lower wall portion 55 of the core layer 51 is formed by the end surface and planar region 110 of the second bulge portion 122. As shown in Figure 8(c), the portion of the upper wall portion 54 where the upper surface and side surface of the first bulge portion 121 overlap to form a two-layer structure, and the portion of the lower wall portion 55 where the end surface of the second bulge portion 122 overlaps with the planar region 110 to form a two-layer structure, each become an overlapping portion 131.

[0042] Furthermore, the hexagonal prism-shaped region formed by the folding of the second bulge 122 becomes the second cell S2, and the hexagonal prism-shaped region formed between a pair of adjacent partitions 130 becomes the first cell S1. In this embodiment, the upper surface and side surface of the second bulge 122 constitute the side wall portion 56 of the second cell S2, and the side surface of the second bulge 122 and the planar portion located between the second bulges 122 in the bulging region 120 constitute the side wall portion 56 of the first cell S1. The contact portions of the upper surfaces of the second bulges 122 and the contact portions of the planar portions in the bulging region 120 form a two-layer side wall portion 56. It is preferable to heat-treat the sheet material 100 to soften it before carrying out this folding process.

[0043] Next, the skin layer 52 is placed on top of the core layer 51, and the skin layer 53 is placed on top of the core layer 51. It is preferable to heat-treat the skin layers 52 and 53 to soften them. When the skin layers 52 and 53 are heat-treated, the adhesive layer of thermoplastic resin coated on the skin layers 52 and 53 is partially melted. Therefore, the skin layers 52 and 53 placed on top of the core layer 51 are positioned in a state of temporary bonding to the core layer 51. As the temperature of the core layer 51 and the skin layers 52 and 53 decreases, the adhesive layer solidifies, and the skin layers 52 and 53 are bonded to the core layer 51 to form the hollow plate material 50.

[0044] The elongated hollow plate material 50 formed in this way can be cut to a predetermined length and width and applied to the bottom plate 20 and the lid plate 40. <Regarding insulation material 30> As shown in Figure 2, the thermal insulation material 30 of this embodiment is formed by cutting a resin foam with a thickness of approximately 40 mm into a rectangular plate shape of approximately 1220 mm x approximately 1800 mm.

[0045] The material of the insulation material 30 is not particularly limited as long as it has insulation properties. It can be appropriately selected from conventionally known resin foams. Examples of resin foams include polystyrene foam, polyurethane foam, polyethylene foam, polypropylene foam, phenolic foam, silicone foam, PVC foam, melamine foam, acrylic foam, and polyimide foam. In this embodiment, the insulation material 30 uses Styrofoam® 1B (manufactured by DuPont Styrofoam Co., Ltd.), which is a polystyrene foam.

[0046] As shown in Figures 2 and 3, the insulation material 30 has a plurality of recesses 31 that open towards the cover plate 40. Four recesses 31 are arranged in the short direction of the insulation material 30, and five recesses 31 are arranged in the long direction of the insulation material 30. All 20 of these recesses 31 are the same size and shape. In this embodiment, the recesses 31 are recessed in the shape of a rectangular parallelepiped, with a length of approximately 145 mm in the short direction of the insulation material 30, a length of approximately 200 mm in the long direction of the insulation material 30, and a depth of approximately 30 mm.

[0047] When used in interior material 10, the coolant 32 is housed in the recess 31. The coolant 32 has the same shape as the recess 31 and is approximately the same size. Specifically, the coolant 32 in this embodiment is a rectangular parallelepiped with dimensions of approximately 140 mm x 195 mm x 25 mm.

[0048] Therefore, the opening area and volume of the recesses 31 are set from the viewpoint of effectively exhibiting the cooling function. Preferably, the sum of the opening areas of all the recesses 31 (20 recesses 31) is 15% to 70% of the area of ​​the main surface of the insulation material 30, and more preferably 30% to 70%. Also, preferably, the sum of the volumes of all the recesses 31 is 10% to 60% of the volume of the insulation material 30, and more preferably 20% to 60%. When the sum of the opening areas and the sum of the volumes of the recesses 31 are within this range, the cooling effect of the interior material 10 can be effectively exhibited.

[0049] As shown in Figure 3, the thickness of the insulation material 30 in the portion where the recess 31 is formed is set not only from the viewpoint of providing a cooling effect by the interior material 10, but also from the viewpoint of effectively demonstrating the compressive strength and bending strength of the interior material 10. Preferably, the thickness of the insulation material 30 in the portion where the recess 31 is formed is 10% to 50% of the thickness of the insulation material 30; in other words, preferably, the depth of the recess 31 is 50% to 90% of the thickness of the insulation material 30. When the depth of the recess 31 is within this range, it is possible to achieve both the cooling effect of the interior material 10 and the securing of the compressive strength and bending strength of the interior material 10.

[0050] The coolant 32 can be appropriately selected from conventionally known coolants. For example, a coolant contained in a blow-molded container made of synthetic resin can be used. <Regarding the function of interior material 10> The function of the interior material 10 will be explained, along with its usage method when applied to the vehicle 1 shown in Figure 1 to cool and maintain the temperature of luggage in the cargo compartment 6.

[0051] In the interior material 10, the bottom plate 20 and the insulation material 30 are joined together via an adhesive layer, while the insulation material 30 and the lid plate 40 are not joined together. Therefore, when installing the interior material 10 in the cargo compartment 6, the bottom plate 20 and the insulation material 30, which are joined together, are first placed on the cargo bed 5. In this state, the recess 31 formed in the insulation material 30 is open upwards.

[0052] Next, the coolant 32, which has been pre-cooled and frozen, is placed in the recesses 31. After all the coolant 32 has been placed in the recesses 31, the cover plate 40 is placed on top of the insulation material 30. The insulation material 30 is made of polystyrene foam, which has low thermal conductivity. The lid plate 40 is placed so as to cover the entire main surface of the insulation material 30 opposite to the bottom plate 20, and aluminum layers 41 and 42, which have high thermal conductivity, are bonded to both main surfaces of the lid plate 40. As a result, the cooling material 32 contained in the recess 31 efficiently lowers the surface temperature of the interior material 10 in the area corresponding to the recess 31. The cooling effect of the cooling material 32 then propagates from the area corresponding to the recess 31 to the area not corresponding to the recess 31 via the aluminum layers 41 and 42. A cooling effect is obtained throughout the interior material 10. The cargo compartment 6 is cooled and kept cool.

[0053] In vehicle 1, the passenger compartment 4 and the cargo compartment 6 are connected via the space above and to the sides of the driver's seat 2 and passenger seat 3. Therefore, air heated in the passenger compartment 4 flows into the cargo compartment 6, causing the temperature inside the cargo compartment 6 to rise. However, the cooling effect of the interior material 10 suppresses the temperature rise inside the cargo compartment 6 and maintains a cooling effect.

[0054] Sunlight enters the cargo area 6 through the side windows 7 and rear window 9 of vehicle 1. In addition, since windows are formed in the front and sides of the passenger compartment 4, sunlight also enters the cargo area 6 through the space above the driver's seat 2 and passenger seat 3, as well as the side spaces. An aluminum layer 41 is bonded to the surface of the lid plate 40 so as to cover the hollow plate material 50. Therefore, the incident sunlight is reflected by the aluminum layer 41. The temperature rise of the entire interior material 10 is suppressed.

[0055] After transporting cargo in vehicle 1 and storing cargo in cargo compartment 6, when the cooling effect of the coolant 32 diminishes, the coolant 32 is removed from the recess 31. Since the lid plate 40 is composed of divided lid plates 40a and 40b connected by a hinge portion 43, if one of the divided lid plates 40a is rotated at the hinge portion 43 while the lid plate 40 is placed on the insulation material 30, the recess 31 beneath the divided lid plate 40a is exposed. In this state, the coolant 32 located on the side of the divided lid plate 40a is removed. The same procedure is performed with the other divided lid plate 40b, allowing the coolant 32 to be removed from all the recesses 31.

[0056] When reusing the interior material 10 to transport goods, etc., the coolant 32, which has been pre-cooled and frozen, can be placed in the recess 31 using the same procedure. According to this embodiment, the following effects can be obtained.

[0057] (1) The interior material 10 has a structure in which a plate-shaped insulating material 30 is sandwiched between a bottom plate 20 and a lid plate 40 made of a hollow structure of synthetic resin. The insulating material 30 has a plurality of recesses 31 that open towards the lid plate 40 and can accommodate a cooling material 32. The lid plate 40 is placed so as to cover the insulating material 30.

[0058] Therefore, by housing the coolant 32 in the recess 31, the surrounding objects can be cooled by the cold air from the coolant 32. By placing the interior material 10 on the cargo bed 5, the inside of the cargo compartment 6 can be effectively cooled and kept cool.

[0059] (2) The bottom plate 20 is formed from a hollow plate material 50 in which multiple cells S are arranged side by side. The lid plate 40 is formed by joining aluminum layers 41 and 42 to the same hollow plate material 50. The hollow plate material 50 is lighter than solid plate material such as plywood.

[0060] Therefore, the work of installing the interior material 10 inside the cargo compartment 6 can be easily performed. Cooling and cooling functions can be easily added to a vehicle 1 that does not have a cooling function. (3) The hollow plate material 50 has appropriate rigidity. Since the main components of the bottom plate 20 and the lid plate 40 are hollow plate material 50, the necessary rigidity is obtained for the interior material 10 on which luggage is placed.

[0061] (4) The cover plate 40 is formed by connecting divided cover plates 40a and 40b, which are arranged side by side in the direction in which the main surface of the cover plate 40 extends, with a hinge portion 43. Therefore, by rotating one of the divided cover plates 40a and 40b at the hinge portion 43, the recess 31 of the insulation material 30 can be exposed. When replacing the coolant 32, it is easy to move each of the divided cover plates 40a and 40b, making it easy to replace the coolant 32 in the recess 31.

[0062] (5) On the main surface of the hollow plate material 50 of the lid plate 40 opposite to the insulation material 30, an aluminum layer 41 is joined so as to cover the hollow plate material 50. When the lid plate 40 is placed on the insulation material 30, the aluminum layer 41 is located on the outer surface of the interior material 10.

[0063] Therefore, even if sunlight enters the vehicle 1 through the side windows 7, rear window 9, and the windows of the passenger compartment 4, it is reflected by the aluminum layer 41. This suppresses the temperature rise of the interior material 10 and also suppresses the temperature rise inside the cargo compartment 6.

[0064] (6) The lid plate 40 has both main surfaces covered with aluminum layers 41 and 42. Since the aluminum layers 41 and 42 have good thermal conductivity, the cooling effect of the coolant 32 contained in the recess 31 is easily transmitted to the entire lid plate 40 of the interior material 10. The cooling effect of the interior material 10 is improved, and the cooling and insulation effects inside the cargo compartment 6 can be improved.

[0065] (7) The recess 31 formed in the thermal insulation material 30 has a depth of 50% or more of the thickness of the thermal insulation material 30. Since the recess 31 does not penetrate the hollow plate material 50, when the coolant 32 is contained, the sides and bottom of the coolant 32 are covered with the insulation material 30. Therefore, the cooling effect of the coolant 32 can be maintained for a long time. On the other hand, if the thickness of the bottom of the recess 31 is adjusted to be thicker in order to maintain the cooling effect for a long time, that is, if the depth of the recess 31 is adjusted to be shallower, the overall thickness of the insulation material 30 will increase. As a result, the volume of the cargo compartment 6 in which the interior material 10 is installed will decrease. In this regard, if the depth of the recess 31 is 50% or more of the thickness of the insulation material 30, the insulation effect can be maintained well while keeping the thickness of the insulation material 30 down. This makes it possible to secure a large space in the cargo compartment 6.

[0066] Furthermore, since the recess 31 is formed in the insulation material 30, the compressive strength and bending strength of the interior material 10 are improved compared to when the part that accommodates the coolant 32 is a through hole. By having a recess 31 that is 50% or more the depth of the insulation material 30 and is not a through hole, it is possible to achieve both a cooling effect and the securing of compressive strength and bending strength.

[0067] (8) Multiple recesses 31 are formed in the thermal insulation material 30. The coolant 32 can be easily placed in and replaced in the recesses 31 by rotating one of the divided lid plates 40a and 40b on the hinge portion 43. This makes it easy to adjust the type and number of coolant 32 placed in the recesses 31. This makes it easy to adjust the cooling effect. It can also be used without placing coolant 32 and without providing a cooling function.

[0068] The above embodiment can be modified as follows. Note that the above embodiment and the following modifications can be combined and applied to the extent that they do not contradict each other technically. In the interior material 10 of the above embodiment, the divided lid plates 40a and 40b are divided into two at an intermediate position in the short direction of the lid plate 40, and the hinge portion 43 extends in the longitudinal direction of the lid plate 40. The divided lid plates 40a and 40b are not limited to this shape. For example, as shown as interior material 10a in Figure 4(a), the divided lid plates 40a and 40b may be divided into two at an intermediate position in the longitudinal direction of the lid plate 40, and the hinge portion 43 may extend in the short direction of the lid plate 40.

[0069] In the interior material 10 of the above embodiment, the divided lid plates 40a and 40b are joined and connected by tape (not shown) with their edges butted together. However, as shown as interior material 10b in Figure 4(b), they do not need to be connected. In this case, the divided lid plates 40a and 40b can be handled separately. This makes them lighter and smaller, and easier to handle.

[0070] As shown in Figure 4(c) as interior material 10c, the divided lid plates 40a and 40b, which are divided into two at the midpoint in the longitudinal direction of the lid plate 40, do not necessarily have to be connected to each other. In the interior material 10 of the above embodiment, the lid plate 40 is divided into two divided lid plates 40a and 40b, but the number of divisions is not limited to this. As shown in Figure 4(d) as interior material 10d, it may be divided into three divided lid plates 40a, 40b, and 40c. It may also be four or more. Furthermore, it may be divided into pieces of different sizes and shapes.

[0071] The lid plate 40 does not need to be divided. As shown in Figure 5 as interior material 11, the lid plate 40 may have multiple notches 44 formed therein. The notches 44 are formed at positions corresponding to the recesses 31 of the insulation material 30, along three sides of the recesses 31. These notches 44 form a hinge portion 45 along the remaining side of the recess 31, creating a lid 46 that opens and closes the recess 31. By rotating the lid 46 at the hinge portion 45, the coolant 32 can be easily placed in and replaced in the recess 31.

[0072] As shown in Figure 6 as interior material 12, the lid plate 40 may have two hinge portions 43 formed on it and be joined by an adhesive layer (not shown) formed on the joint portion 47 between the two hinge portions 43. In this case, while the lid plate 40 remains joined and attached to the heat insulating material 30, the coolant 32 can be placed in and replaced in the recess 31 by rotating each of the two hinge portions 43.

[0073] The lid plate 40 and the insulation material 30 may be joined by an adhesive layer. In this case, multiple openings are formed in the lid plate 40 and closing plates are provided to close the openings. The openings (closing plates) are formed at positions corresponding to the recesses 31 of the insulation material 30. For example, the portion shown as the hinge portion 45 in Figure 5 is also cut out as a notch 44, so that the lid 46 is formed as a closing plate which is a plate material independent of the lid plate 40. By making the closing plate detachable from the lid plate 40, the cooling material 32 can be stored in and replaced in the recesses 31.

[0074] In the interior material 10 of the above embodiment, the thermal insulation material 30 is formed by creating a recess 31 with a depth of approximately 30 mm in a single layer of polystyrene foam with a thickness of approximately 40 mm. The thermal insulation material 30 is not limited to a single layer structure, but may also have a multilayer structure. For example, it may have a structure in which a thermal insulation material with a thickness of approximately 30 mm and a thermal insulation material with a thickness of approximately 10 mm are laminated together. In this case, a through hole is formed in the thermal insulation material with a thickness of approximately 30 mm. By laminating these two layers of thermal insulation material, the thermal insulation material with a thickness of approximately 10 mm becomes the bottom of the through hole, and the through hole formed in the thermal insulation material with a thickness of 30 mm becomes the recess 31 in the laminated thermal insulation material.

[0075] Alternatively, for example, a three-layer structure consisting of an insulating material approximately 20 mm thick, an insulating material approximately 10 mm thick, and another insulating material approximately 10 mm thick may be used. In this case, through-holes may be formed in one of the insulating materials, specifically the one approximately 20 mm thick and the one approximately 10 mm thick.

[0076] A structure for attaching the cover plate 40 to the insulation material 30 may exist. For example, an engaging portion provided on the cover plate 40 may be made to engage with the insulation material 30. In the interior material 10 of the above embodiment, the bottom plate 20 and the insulation material 30 are joined via an adhesive layer (not shown), but they do not necessarily have to be joined to each other. For example, the insulation material 30 may be placed on top of the bottom plate 20 without being joined, as in the case of the lid plate 40.

[0077] In the interior material 10 of the above embodiment, a nonwoven fabric tape (not shown) is joined to the entire circumference of the edge of the lid plate 40, but the nonwoven fabric tape may be omitted. Alternatively, a nonwoven fabric tape may be joined to the edge of the bottom plate 20 to protect the ends.

[0078] The size, thickness, and shape of the interior material 10 are not limited to those of the above embodiment. In the above embodiment, the interior material 10 is formed as a single sheet of material sized to cover almost the entire cargo bed 5, but for example, two sheets of material each approximately half the size of the cargo bed 5 may be used in combination. Also, the shape is not limited to a rectangular sheet; for example, it may be a square sheet or a triangular sheet.

[0079] The corners 13 of the interior material 10 do not need to be chamfered. A space may be formed around the periphery of the recess 31 for inserting a hand when inserting or removing the coolant 32. In that case, the opening area and volume of the recess 31 will increase, but the preferred numerical range for the opening area and volume of the recess 31 described above does not include this space.

[0080] • As the hollow plate material 50, conventionally known plate-shaped hollow structures can be used as appropriate. In addition to being used on the cargo bed 5 of the vehicle 1, the interior material 10 may also be used by attaching it to the side of the cargo compartment 6 of the vehicle 1 or to the ceiling of the cargo compartment 6.

[0081] The interior material 10 may be applied to vehicles other than vehicle 1. The technical concept understood from the above embodiments is described below. (a) A cooling interior material comprising a bottom plate made of a hollow structure made of synthetic resin, a plate-shaped insulating material provided to cover one main surface of the bottom plate, and a lid plate made of a hollow structure made of synthetic resin and provided to cover the main surface of the insulating material opposite to the bottom plate, wherein the insulating material is provided with a recess that opens toward the lid plate and can accommodate a cooling material, and the lid plate has a lid body formed at a position corresponding to the recess that can open the recess. [Explanation of Symbols]

[0082] 10, 10a, 10b, 10c, 10d, 11, 12...Interior material (cooling interior material) 20…Bottom plate 30…Insulation 31…recess 32...Coolant 40…Lid plate 50...Hollow plate material (hollow structure, cover plate body)

Claims

1. A base plate made of a hollow structure of synthetic resin, A plate-shaped insulating material is provided so as to cover one main surface of the bottom plate, It consists of a hollow structure made of synthetic resin, and a lid plate is provided to cover the main surface of the insulating material opposite to the bottom plate. Equipped with, The aforementioned heat insulating material is characterized by having a recess that opens to the lid plate side and is capable of accommodating a cooling material.

2. The cooling interior material according to claim 1, characterized in that the cover plate is configured to accommodate the cooling material in the recess when attached to the heat insulating material.

3. The cooling interior material according to claim 1, characterized in that the cover plate comprises a cover plate body made of a hollow structure and an aluminum layer that is joined to the main surface of the cover plate body opposite to the heat insulating material to form an outer surface.

4. The cooling interior material according to claim 1, characterized in that the cover plate comprises a cover plate body made of a hollow structure and aluminum layers joined to each of the two main surfaces of the cover plate body.

5. The cooling interior material according to claim 1, characterized in that the depth of the recess is 50% or more of the thickness of the heat insulating material.

6. The cooling interior material according to any one of claims 1 to 5, characterized in that the cover plate is formed by arranging a plurality of divided cover plates side by side in the direction in which the main surface of the divided cover plate extends.

7. The cooling interior material according to claim 6, characterized in that the adjacent divided lid plates are connected via a hinge portion.

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