panel

Abstract

To provide a panel of which the buckling-deformation is suppressed.SOLUTION: A panel is provided, comprising a core material and first surface and second surface materials, the core material is sandwiched between the first and second surface materials, the core material has a thickness of 15 to 25 mm, and the first and second surface materials are adhered to the core material, wherein when (Young's modulus of the first surface material [GPa])×(thickness of the first surface material [mm])2 denotes a first surface material strength index, (Young's modulus of the second surface material [GPa])×(thickness of the second surface material [mm])2 denotes the second surface material strength index, and an average value of the first and second surface material strength indexes is an average surface material strength index, a panel strength index defined by the average surface material strength index X (10% compressive stress [MPa] of the core material) is 0.7 or more.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a panel that can be used as a luggage board or the like to be installed in a luggage compartment of a vehicle. [Background technology]

[0002] Patent Document 1 discloses a panel constructed by attaching thin plate-shaped face materials to a core material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-7900 A Summary of the Invention [Problem to be solved by the invention]

[0004] Panels such as that described in Patent Document 1 have excellent strength, but when the inventors conducted a detailed study on the strength of the panel, they found that the panel is prone to buckling deformation, in which the panel bends, when a localized load is applied to the face material.

[0005] The present invention has been made in view of the above circumstances, and provides a panel in which the occurrence of buckling deformation is suppressed. [Means for solving the problem]

[0006] According to the present invention, there is provided a panel comprising a core material and first and second face materials, the core material being sandwiched between the first and second face materials, the core material having a thickness of 15 to 25 mm, the first and second face materials being bonded to the core material, and (Young's modulus of the first face material [ G Pa]) × (First surface material thickness [mm]) 2 is the strength index of the first surface material, (Young's modulus of the second surface material [ G Pa]) × (2nd surface thickness [mm]) 2is the second panel strength index, and the average of the first and second panel strength indices is the average panel strength index, the panel having a panel strength index defined as the average panel strength index x (10% compressive stress [MPa] of the core material) of 0.7 or more is provided.

[0007] The inventors conducted extensive research and found that buckling deformation occurs when a panel is locally deformed when a local load is applied to the panel. Based on this knowledge, the inventors found that the occurrence of buckling deformation can be effectively suppressed by setting the panel strength index, which correlates with the local strength of the panel, to 0.7 or more, and thus completed the present invention.

[0008] Various embodiments of the present invention will be described below. The embodiments described below can be combined with each other. Preferably, the panel is the above-described panel, wherein the panel strength index is 5.0 or less. Preferably, the panel has a basis weight of 3000 g / m 2 Below is the panel. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1A is a perspective view of a panel 1 according to one embodiment of the present invention, FIG. 1B is an enlarged view of an end face in region B in FIG. 1A, and FIG. 1C is a view in which only a core material 2 is extracted from FIG. 1B. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, embodiments of the present invention will be described. Various features shown in the following embodiments can be combined with each other. Also, each feature can be an invention independently.

[0011] 1. First embodiment 1-1. Structure of Panel 1 As shown in Fig. 1, a panel 1 according to one embodiment of the present invention includes a core material 2 and first and second face materials 3a, 3b. The core material 2 is sandwiched between the face materials 3a, 3b. The panel 1 preferably has a substantially rectangular parallelepiped shape. The panel 1 can be used as a luggage board or the like to be installed in the luggage compartment of a vehicle.

[0012] The length of the panel 1 in the first direction is L1, and the length in the second direction perpendicular to the first direction is L2, where L1≧L2. L1 is, for example, 600 to 1200 mm, specifically, for example, 600, 700, 800, 900, 1000, 1100, 1200 mm, and may be within a range between any two of the numerical values ​​exemplified here. L1 is, for example, 300 to 1200 mm, specifically, for example, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200 mm, and may be within a range between any two of the numerical values ​​exemplified here. The value of L2 / L1 is, for example, 0.3 to 1, specifically, for example, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, and may be within a range between any two of the numerical values ​​exemplified here.

[0013] The weight per unit area of ​​Panel 1 is set at 3000g / m2 to reduce the weight of Panel 1. 2 The weight per unit area is preferably 1500 to 3000 g / m or less. 2 Specifically, for example, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900, 3000 g / m 2 and may be in the range between any two of the values ​​given here.

[0014] The core material 2 is preferably a plate-shaped member. The thickness of the core material 2 is 15 to 25 mm, preferably 18 to 22 mm. If the core material 2 is too thin, the overall deflection of the panel 1 becomes too large. On the other hand, if the core material 2 is too thick, the weight of the panel 1 becomes too large. Specifically, the thickness is, for example, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25 mm, and may be within a range between any two of the numerical values ​​exemplified here. The thickness of the core material 2 means the distance at the portion where the distance between the first and second main surfaces 2a and 2b of the core material 2 facing each other is the largest. The core material 2 is preferably provided with a recess, and the face materials 3a and 3b are fixed in the recess. This prevents the face materials 3a and 3b from peeling off the core material 2.

[0015] The core material 2 may be a foamed or non-foamed body. The core material 2 may be a hollow or solid body. The core material 2 is preferably formed by molding using a mold. In this case, the core material 2 can be formed into a desired shape before the panel 1 is manufactured, and therefore, it is easy to handle. In addition, the core material 2 can be formed into a shape that matches the desired panel shape, and therefore, a product with an optimized shape can be obtained.

[0016] Examples of the core material 2 include a bead foam molded body obtained by bead expansion molding, a foamed or non-foamed sheet molded body obtained by imparting an uneven shape to a foamed or non-foamed resin sheet, and a foamed or non-foamed hollow molded body obtained by molding a foamed or non-foamed cylindrical parison or two resin sheets.

[0017] The bead foam can be made of, for example, expanded polystyrene, expanded acrylonitrile styrene, expanded polypropylene, etc., and its expansion ratio is, for example, 20 to 50 times, specifically, for example, 20, 25, 30, 35, 40, 45, 50 times, or may be within a range between any two of the numerical values ​​exemplified here.

[0018] The foamed parison or foamed resin sheet can be made of a polyolefin such as polyethylene or polypropylene, and the foaming ratio of a molded article using the same is, for example, 1.1 to 8 times, specifically, for example, 1.1, 1.5, 2, 3, 4, 5, 6, 7, or 8, and may be within a range between any two of the numerical values ​​exemplified here.

[0019] The 10% compressive stress of the core material 2 is, for example, 0.1 to 1.0 MPa. If this value is too small, buckling deformation is likely to occur, and if this value is too large, the weight of the panel 1 is likely to become excessive. Specifically, this value is, for example, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, or 1.00 MPa, and may be within a range between any two of the numerical values ​​exemplified here. The 10% compressive stress of the core material 2 can be measured according to JIS K 7220.

[0020] The weight of the core material 2 is, for example, 400 to 1000 g / m 2 Specifically, for example, 400, 500, 600, 700, 800, 900, 1000 g / m 2 and may be in the range between any two of the values ​​given here.

[0021] The face materials 3a and 3b are plate-like members, respectively, and are bonded to the main surfaces 2a and 2b of the core material 2. The face materials 3a and 3b can be made of a material having a higher rigidity per unit thickness than the core material 2, for example, metal (aluminum, iron, etc.) or fiber-reinforced resin. The thickness of each of the face materials 3a and 3b is, for example, 0.05 to 1 mm, and preferably 0.08 to 0.5 mm. Specifically, for example, the thickness is 0.05, 0.08, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.60, 0.70, 0.80, 0.90, or 1.00 m, and may be within a range between any two of the numerical values ​​exemplified here. In this specification, values ​​of thickness, depth, etc. mean average values ​​unless otherwise specified.

[0022] The weight of each of the facing materials 3a and 3b is, for example, 400 to 1000 g / m 2 Specifically, for example, 400, 500, 600, 700, 800, 900, 1000 g / m 2 and may be in the range between any two of the values ​​given here.

[0023] The facing materials 3a and 3b can be bonded to the core material 2 via adhesive layers 6a and 6b, respectively. Examples of adhesives constituting the adhesive layers 6a and 6b include urethane adhesives and olefin adhesives, and one-liquid reactive urethane adhesives are preferred. The thickness of each of the adhesive layers 6a and 6b is, for example, 0.01 to 0.5 mm, and more specifically, for example, 0.01, 0.05, 0.1, 0.2, 0.3, 0.4, and 0.5 mm, and may be within a range between any two of the numerical values ​​exemplified here. The basis weight of each of the adhesive layers 6a and 6b is, for example, 10 to 100 g / m 2 Specifically, for example, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 g / m 2 and may be in the range between any two of the values ​​given here.

[0024] (Young's modulus of the first surface material 3a [ G Pa]) × (thickness of first surface material 3a [mm]) 2 is the strength index of the first surface material, (Young's modulus of the second surface material 3b [ G Pa]) × (thickness of second surface material 3b [mm]) 2 If the second panel strength index is taken as the second panel strength index and the average of the first and second panel strength indexes is taken as the average panel strength index, the panel strength index defined as the average panel strength index x (10% compressive stress of the core material [MPa]) is 0.7 or more.

[0025] The face material strength index is an index showing the strength of the face materials 3a and 3b. The first and second face material strength indexes and the average face material strength index are each preferably 1.5 or more and 10 or less. If this value is too small, buckling deformation is likely to occur, and if this value is too large, the weight of the panel 1 is likely to be excessive. Specifically, this value is, for example, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, or 10.0, and may be within a range between any two of the numerical values ​​exemplified here.

[0026] The panel strength index is an index showing strength correlated with the local strength of the panel 1. It is preferable that the panel strength index is 0.7 or more and 5.0 or less. If this value is too small, buckling deformation is likely to occur, and if this value is too large, the weight of the panel 1 is likely to become excessive. Specifically, this value is, for example, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0, and may be within a range between any two of the numerical values ​​exemplified here.

[0027] The buckling load (the minimum load at which buckling deformation occurs) when a load is applied to the center of the panel 1 in the first direction with a presser having a contact surface diameter of 50 mm while the two edges of the panel 1 are supported in the first direction is preferably 40 kg or more and preferably 300 kg or less. If this value is too small, buckling deformation is likely to occur, and if this value is too large, the weight of the panel 1 is likely to be excessive. Specific examples of this value are 40, 50, 60, 70, 80, 90, 100, 150, 200, 250, and 300 kg, and may be within a range between any two of the values ​​exemplified here.

[0028] 1-2. Manufacturing method of panel 1 The panel 1 can be manufactured by applying adhesive (eg, spraying or beading) onto the core material 2 and then pressing the facing materials 3 a and 3 b onto the core material 2 .

[0029] 2. Other embodiments If necessary, a skin material may be provided so as to cover the core material 2 and the face materials 3a, 3b. This improves the appearance and prevents the face materials 3a, 3b from peeling off from the core material 2. The skin material is, for example, a nonwoven fabric, and can be adhered to the face materials 3a, 3b and the core material 2 via an adhesive layer. EXAMPLES

[0030] A panel 1 having a planar shape of 1000 mm × 450 mm was manufactured using the core material 2 and the surface materials 3a and 3b shown in Table 1. A one-liquid reactive urethane adhesive was used as the adhesive for bonding the core material 2 and the surface materials 3a and 3b, and the adhesive was 60 g / m 2 In the examples and comparative examples in Table 1, the materials and thicknesses of the face materials 3a and 3b were the same. Al5052 was used as the Al, and SUS304 was used as the SUS. The core material 2 was manufactured using Heat Pole GR (JSP Corporation).

[0031] With both ends of the panel 1 in the longitudinal direction supported, a load was applied to the longitudinal center of the panel 1 using a presser with a contact surface diameter of 50 mm. The load was increased by 10 kg at a time, and the load at which buckling deformation occurred was taken as the buckling load. The results are shown in Table 1.

[0032] [Table 1]

[0033] As shown in Table 1, in all Examples in which the panel strength index was 0.7 or more, buckling deformation was unlikely to occur. [Explanation of symbols]

[0034] 1: Panel 2: Core material 2a: 1st main surface 2b: Second main surface 3a: 1st surface material 3b: Second surface material 6a: Adhesion layer 6b: Adhesion layer

Claims

1. A panel comprising a core material and first and second face materials, The core material is sandwiched between first and second face materials, The core material has a thickness of 15 to 25 mm; the first and second face materials are bonded to the core material; (Young's modulus of the first surface material [GPa]) × (thickness of the first surface material [mm]) ２ is the first face material strength index, (Young's modulus of the second surface material [GPa]) × (thickness of the second surface material [mm]) ２ is the second face material strength index, If the average value of the first and second face material strength indices is taken as the average face material strength index, A panel having a panel strength index, defined as the average surface material strength index x (10% compressive stress [MPa] of the core material), of 0.7 or more and 5.0 or less.

2. 2. The panel of claim 1, The panel has a basis weight of 3000 g / m ２ Below is the panel.

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