Ceiling surface material

Abstract

To provide a ceiling surface material which is light-weighted and thin, in which waviness hardly occurs, and which has excellent designability, and to provide a building ceiling formed by the ceiling surface material.SOLUTION: A ceiling surface material 30 is mounted on a ceiling backing material 40, and forms a building ceiling 60. The ceiling surface material 30 includes a surface material center 10 and a surface material peripheral edge 20 which is the peripheral edge of the surface material center 10, and the surface material center 10 includes a waviness prevention part 11. Regarding the surface material peripheral edge 20, surface material peripheral edges 20 of adjacent different ceiling surface materials 30 overlap to be fastened to each other. The ceiling surface material 30 is a pulp mold molded article formed by a material containing an inorganic material, a resin material, and a pump fiber. In the pump mold molded article, the inorganic material is in a range of 10-50 wt.%, the resin material is in a range of 3-50 wt.%, and the pulp fiber is in a range of 20-80 wt.%.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a ceiling surface material. [Background technology]

[0002] Building ceilings are generally formed by attaching hard ceiling surface materials such as gypsum boards to ceiling underlayment materials such as rough joists. However, ceiling surface materials such as gypsum boards are relatively heavy, so ceiling collapse in earthquakes is one of the issues. Therefore, by forming building ceilings with lightweight ceiling surface materials, this ceiling collapse issue can be resolved.

[0003] Examples of lightweight, thin ceiling facing materials include mixed sheets made primarily of pulp fiber, and by fastening such ceiling facing materials to ceiling underlayment to form a building ceiling, the building ceiling will have excellent design appeal.

[0004] Patent Document 1 proposes a ceiling material in which the front, back and peripheral edge surfaces of a corrugated cardboard sheet, which has a core part that forms a hollow air layer and an outer liner attached to the front and back surfaces of the core part, are covered with a non-combustible material. In this ceiling material, the mass per unit area of ​​the material that forms the outer liner is equal to or greater than the mass per unit area of ​​the material that forms the core part, and decorative paper or decorative film is attached to at least one surface of the ceiling material. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-66128 Summary of the Invention [Problem to be solved by the invention]

[0006] The ceiling material described in Patent Document 1 is lightweight because it uses corrugated cardboard as the core material, and does not pose the problem of the ceiling collapsing during an earthquake.

[0007] However, as mentioned above, when a lightweight and thin ceiling surface material is applied to a building ceiling, undulations (waving) tend to occur on the surface of the ceiling surface material, and the shadows caused by this undulation become conspicuous, which can actually impair the design of the building ceiling, raising concerns about a new problem. Furthermore, the ceiling material described in Patent Document 1 also has decorative paper attached to its surface, which means that it also has the same problem of undulations on the surface of the ceiling surface material.

[0008] The present invention has been made in view of the above problems, and aims to provide a ceiling surface material that is lightweight and thin, yet is less likely to swell, and has excellent design properties. [Means for solving the problem]

[0009] In order to achieve the above object, one aspect of the ceiling surface material according to the present invention is: A ceiling surface material that is attached to a ceiling substrate to form a building ceiling, The ceiling surface material has a surface material center and a surface material periphery that is a periphery of the surface material center, The center of the face material is provided with a ripple prevention portion, the ceiling surface material is a pulp molded product formed from a material containing an inorganic material, a resin material, and pulp fiber, The swell prevention portion is characterized in that the center of the face material is a curved surface that is convex toward the interior side of the room.

[0010] According to this aspect, the ceiling surface material is provided with a swell prevention portion at the center, so that even if the ceiling surface material is lightweight and thin, swells can be suppressed, resulting in a ceiling surface material with excellent design. Furthermore, because the swell prevention portion has a curved surface that is convex toward the interior of the room at the center of the surface material, swells at the center of the surface material can be effectively suppressed with a simple and inconspicuous swell prevention portion. Furthermore, because the ceiling surface material is a pulp molded product (pulp molded product), thin ceiling surface materials can be manufactured in a variety of three-dimensional shapes.

[0011] Another aspect of the ceiling surface material according to the present invention is: A ceiling surface material that is attached to a ceiling substrate to form a building ceiling, The ceiling surface material has a surface material center and a surface material periphery that is a periphery of the surface material center, The center of the face material is provided with a ripple prevention portion, the ceiling surface material is a pulp molded product formed from a material containing an inorganic material, a resin material, and pulp fiber, The swell prevention portion is characterized by one or more fold lines and dividing surfaces in which the center of the panel is divided into multiple parts by the fold lines, and each dividing surface has a curved surface that convexly curves toward the interior side of the room at its center.

[0012] According to this aspect, the ripple prevention section is a divided surface divided into multiple sections by a crease line in the center of the panel, and the center of the divided surface is a curved surface that convexly curves toward the interior of the room, so that the ripple prevention section with a simple and unobtrusive configuration can effectively suppress ripples in the center of the panel. Furthermore, because each divided surface is vaguely (faintly) divided by shallow creases, it can create a design similar to that of quilted fabric.

[0013] Another aspect of the ceiling surface material according to the present invention is: A ceiling surface material that is attached to a ceiling substrate to form a building ceiling, The ceiling surface material has a surface material center and a surface material periphery that is a periphery of the surface material center, The center of the face material is provided with a ripple prevention portion, the ceiling surface material is a pulp molded product formed from a material containing an inorganic material, a resin material, and pulp fiber, The swell prevention portion is characterized by one or more grooves and dividing surfaces in which the center of the face material is divided into multiple parts by the grooves.

[0014] According to this aspect, the ripple prevention portion is a divided surface in which the center of the panel is divided into multiple parts by grooves, thereby creating a unified and contrasting design while effectively suppressing ripples in the center of the panel.

[0015] Another aspect of the ceiling surface material according to the present invention is: A ceiling surface material that is attached to a ceiling substrate to form a building ceiling, The ceiling surface material has a surface material center and a surface material periphery that is a periphery of the surface material center, The center of the face material is provided with a ripple prevention portion, the ceiling surface material is a pulp molded product formed from a material containing an inorganic material, a resin material, and pulp fiber, The swell prevention portion is characterized by being a convex ridge extending along the boundary line between the center of the panel and the periphery of the panel and projecting toward the interior side.

[0016] According to this aspect, the ripple prevention portion extends along the boundary line between the center of the panel and the periphery of the panel, and is a convex ridge that protrudes toward the interior side of the room, thereby creating a unified and contrasting design while effectively suppressing ripples in the center of the panel.

[0017] In another aspect of the ceiling surface material according to the present invention, The thickness of the peripheral edge of the face material is thinner than that of the center of the face material.

[0018] According to this embodiment, the relatively thick center of the face material increases its elasticity, particularly in pulp molded products, resulting in even better design. Furthermore, the relatively thin edge of the face material prevents the face material from becoming too bulky because the edge is where the face material is to be overlapped. The thin edge hardens the face material, improving flatness and improving overlapping properties. Furthermore, in the case of pulp molded products, it is particularly easy to manufacture molded products in which the thickness of both the center and the edge of the face material can be freely adjusted. For example, it is preferable to have a center thickness of approximately 1 mm and a peripheral thickness that is 0.1 to 0.3 mm thinner than the center of the face material. [Effects of the Invention]

[0019] As can be understood from the above explanation, the ceiling surface material of the present invention can provide a ceiling surface material that is lightweight and thin, yet is less likely to swell, and has excellent design properties. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a perspective view of an example of a ceiling surface material according to a first embodiment, as viewed from the front side (the indoor side when forming a building ceiling). [Figure 2] 1 is a perspective view of an example of a ceiling surface material according to a first embodiment, viewed from the rear side. FIG. [Figure 3] 3 is a view taken along the line III-III in FIG. 1, and is a vertical cross-sectional view of an example of a ceiling surface material. [Figure 4] FIG. 10 is a plan view of an example of a ceiling surface material according to a second embodiment, viewed from the front side. [Figure 5] FIG. 10 is a perspective view of an example of a ceiling surface material according to a third embodiment. [Figure 6] FIG. 10 is a perspective view of an example of a ceiling surface material according to a fourth embodiment. [Figure 7] FIG. 10 is a perspective view of an example of a ceiling surface material according to a fifth embodiment. [Figure 8] FIG. 2 is a view of a portion of a building ceiling viewed from diagonally below, in which a plurality of ceiling surface materials of the first embodiment are fastened to a ceiling underlayment. DETAILED DESCRIPTION OF THE INVENTION

[0021] The ceiling surface materials according to each embodiment will be described below with reference to the attached drawings together with the building ceiling to which the ceiling surface materials are applied. Note that in this specification and the drawings, substantially identical components may be designated by the same reference numerals to avoid redundant description.

[0022] [Ceiling surface material according to the first embodiment] First, a ceiling surface material according to a first embodiment will be described with reference to Figures 1 to 3. Here, Figure 1 is a perspective view of an example of a ceiling surface material according to the first embodiment as seen from the front side (the room side when a building ceiling is formed), Figure 2 is a perspective view of an example of a ceiling surface material according to the first embodiment as seen from the back side, and Figure 3 is a view taken along the arrows III-III in Figure 1, which is a vertical cross-sectional view of the example of the ceiling surface material.

[0023] The illustrated ceiling panel 30 has a panel center 10 that is substantially box-shaped and square (an example of a rectangle) in plan view, and a panel peripheral edge 20 that is rectangular and surrounds the panel center 10.

[0024] The roughly box-shaped center 10 of the panel rises from the rectangular frame-shaped peripheral edge 20 of the panel, and the wide surface of the center 10 of the panel forms a curved surface 11 (an example of a swell prevention part) that convexly faces the front side (the indoor side when forming the building ceiling).

[0025] The length of one side of the center of the face material 10 is t1, and the height of the end is t2, where t1 can be set to about 400 mm to 700 mm (for example, 580 mm), and t2 can be set to about 10 mm to 30 mm (for example, 20 mm). Furthermore, the curvature of the curved surface 11 can be set to about 1 / 80 to 1 / 10 (for example, 1 / 25 or 1 / 50).

[0026] The panel periphery 20 is formed by four straight line portions 21, all of which have the same width t3, and these straight line portions 21 are arranged to overlap the straight line portions 21 of the panel periphery 20 of an adjacent separate ceiling panel 30. Here, the width t3 can be set to approximately 10 mm to 30 mm (for example, 20 mm).

[0027] Here, the width t3 of the straight portion 21 is the joint width when the straight portions 21 of adjacent separate ceiling panel materials 30 are overlapped, and the height t2 of the end of the panel center 10 is the joint depth.

[0028] A fastening hole 22 through which a fastener (not shown) is inserted is provided in the center of each straight portion 21 of the face material peripheral edge 20, and similar fastening holes 22 are provided at the four corners. The fastening hole 22 is preferably provided in the center of the width of the straight portion 21. Here, the number and positions of the fastening holes 22 are not limited to those in the illustrated example.

[0029] Furthermore, the thickness t4 of the center 10 of the face material is thicker than the thickness t5 of the peripheral edge 20 of the face material, and the thickness t4 of the center of the face material can be set to about 1 mm (0.7 mm as an example), and the thickness t5 of the peripheral edge of the face material can be set to about 0.1 to 0.3 mm thinner than the thickness t4 (0.5 mm as an example).

[0030] The ceiling surface material 30 is a pulp molded product formed by pulp molding processing, and is made of a material containing an inorganic material, a resin material, and pulp fiber.

[0031] The proportions of each material in the pulp molded product are 10 to 50% by weight of inorganic material, 3 to 50% by weight of resin material, and 20 to 80% by weight of pulp fiber.

[0032] First, because the ceiling panel 30 is a pulp molded product, it is possible to manufacture thin ceiling panels in a variety of three-dimensional shapes. Also, the thickness t4 of the panel center 10 and the thickness t5 of the panel periphery 20 can be easily manufactured to different thicknesses, as shown in the example.

[0033] In the ceiling panel 30 made from a pulp molded product, the thickness of the panel center 10 is relatively thick, which increases its elasticity and improves the design. Also, the thickness of the panel periphery 20 is relatively thin, which prevents the panel periphery 20 from becoming too bulky as it is where the panels are overlapped, and the thinness of the panel periphery 20 makes it hard, and the increased flatness improves overlapping properties.

[0034] Furthermore, by setting the ratio of each material forming the pulp molded product 30 within the above numerical ranges, the following effects are achieved.

[0035] First, inorganic materials have the effect of suppressing the heat generation of products, and since sufficient non-combustibility cannot be achieved unless the inorganic material content is 10% by weight or more, the lower limit of the inorganic material content is preferably 10% by weight or more. More specifically, sufficient non-combustibility can be ensured by having an inorganic material content of 20% by weight or more. On the other hand, if the inorganic material content is too high, the amount of pulp fiber will be insufficient, and the molded product will not have sufficient strength, so the upper limit of the inorganic material content is preferably 50% by weight or less.

[0036] Furthermore, the resin material has the effect of improving the processability (moldability) during pulp molding. However, if there is too much resin material, the amount of heat generated increases, and the effect of the inorganic material in suppressing the amount of heat generated is diminished. Therefore, it is desirable to set the lower limit at 3% by weight and the upper limit at 50% by weight.

[0037] Furthermore, with regard to pulp fiber, it is desirable to have a high content because it is a material that contributes to the strength (rigidity) of the molded product. However, from the viewpoint of the processability and non-combustibility mentioned above, it is desirable to set the lower limit at 20% by weight and the upper limit at 80% by weight, taking into account the relationship between the upper and lower limits of the other inorganic materials and resin materials.

[0038] More specifically, Minerpa (registered trademark) manufactured by Nippon Paper Industries Co., Ltd. can be used as a molding material. The inorganic materials in Minerpa include magnesium carbonate (MgCO3) and hydrotalcite (MgCo6Al2(OH) 16 Various materials are used, such as aluminum hydroxide (Al(OH)3), silica (SiO2), and barium sulfate (BaSO4), but aluminum hydroxide (Al(OH)3) is preferred due to its higher non-flammability or flame retardancy. Both inorganic materials release water of crystallization when heated, and release carbon dioxide during decomposition, thereby achieving non-flammability or flame retardancy. Minerpa is a material in which inorganic materials are attached to pulp fibers, making it preferable as it is a material that makes it easy to obtain non-flammability and strength in molded products.

[0039] In the ceiling surface material 30, the surface material center 10 has a curved surface 11 that is convex toward the front side, which makes it lightweight and thin, and even though it is a pulp molded product, it is possible to suppress the occurrence of undulations that may occur in the surface material center 10. As a result, when the surface material peripheral edges 20 of multiple ceiling surface materials 30 are overlapped to form a building ceiling, no undulations occur in the ceiling surface materials 30 that make up the building ceiling, making it possible to form a building ceiling with excellent design.

[0040] Here, according to the ceiling surface material 30, the weight of the building ceiling including the ceiling underlayment is 2 kg / m 2 The ceiling surface material 30 alone can achieve the following: 2 The following can be achieved:

[0041] Furthermore, since the center 10 of the surface material is simply provided with a curved surface 11 that is convex toward the front side, it is possible to create a building ceiling with a simple design that is easy to be accepted by everyone.

[0042] Furthermore, in the ceiling surface material 30, the planar shape of the center 10 of the surface material is square, and the width t3 of each straight section 21 that makes up the peripheral edge 20 of the surface material is the same. Therefore, when the ceiling surface material 30 is fastened to a ceiling base material (not shown) to construct a building ceiling, no directionality is created in the ceiling surface material 30, which improves the ease of construction of the building ceiling.

[0043] [Ceiling surface material according to the second embodiment] Next, a ceiling surface material according to a second embodiment will be described with reference to Fig. 4. Here, Fig. 4 is a plan view of an example of a ceiling surface material according to the second embodiment, viewed from the front side.

[0044] The illustrated ceiling surface material 30A has a surface material center 10 equipped with the same anti-waviness portion 11 as the ceiling surface material 30, but differs from the ceiling surface material 30 in that it has a surface material peripheral edge 20A equipped with straight portions 21A and 21B of different widths.

[0045] The panel peripheral edge 20A in the illustrated example has two adjacent wide straight portions 21A (L-shaped straight portions in plan view) and two similarly adjacent narrow straight portions 21B (L-shaped straight portions in plan view).

[0046] The narrow straight portion 21B has recesses 24 that penetrate into the face material center 10 at its longitudinal center position (an example of an intermediate position) and at the corners (another example of an intermediate position) of the narrow straight portion 21B, and fastening holes 22 are provided in the recesses 24. The wide straight portion 21A has fastening holes 22 at its longitudinal center position and at the corners.

[0047] The width t3 of the wide linear portion 21A can be set to, for example, 20 mm, and the width t6 of the narrow linear portion 21B can be set to, for example, 5 mm. In the narrow linear portion 21B, the width t7 to the engraving 24 can be set to 20 mm, the same as the width t3 of the wide linear portion 21A.

[0048] The peripheral edge 20A of the face material has a total of four straight line sections 21A, 21B of relatively wide and narrow widths, and an indentation 24 is provided midway on the narrow straight line section 21B, and fastening holes 22 for fasteners are provided in the indentation 24, so that the width of the center 10 of the face material can be made as wide as possible by the narrow straight line section 21B.

[0049] Furthermore, when overlapping the straight sections of adjacent ceiling surface materials 30A, when the narrow straight section 21B of one ceiling surface material 30A is overlapped with the wide straight section 21A of the other ceiling surface material 30A, the fastening holes 22 in the wide straight section 21A and the fastening holes 22 in the recesses 24 of the narrow straight section 21B can be aligned, making it possible to insert a fastener (not shown) into both aligned fastening holes 22.

[0050] [Ceiling surface material according to the third embodiment] Next, a ceiling surface material according to a third embodiment will be described with reference to Fig. 5. Here, Fig. 5 is a perspective view of an example of the ceiling surface material according to the third embodiment.

[0051] The illustrated ceiling panel 30B has a panel periphery 20 similar to that of the ceiling panel 30 shown in Figure 1 etc., but has a panel center 10A different from that of the ceiling panel 30. The panel center 10A has four fold lines 12, and each fold line 12 divides the panel center 10A into four dividing surfaces 13 that are square in plan view, and the center of each dividing surface 13 is a curved surface that convexly curves toward the front side (inside the room). Here, the ceiling panel 30B may have a panel periphery 20A of a different width, similar to the ceiling panel 30A.

[0052] In the ceiling panel 30B, multiple (four in the illustrated example) fold lines 12 and dividing surfaces 13, which are curved surfaces with a convex central portion formed by each fold line 12, form a swell prevention portion, thereby preventing swells in the center 10A of the panel.

[0053] Furthermore, in the ceiling surface material 30B, each dividing surface 13 is vaguely divided by shallow fold lines 12, which gives it a design reminiscent of quilted fabric.

[0054] [Ceiling surface material according to the fourth embodiment] Next, a ceiling surface material according to a fourth embodiment will be described with reference to Fig. 6. Here, Fig. 6 is a perspective view of an example of the ceiling surface material according to the fourth embodiment.

[0055] The illustrated ceiling panel 30C has a panel periphery 20 similar to that of the ceiling panel 30 shown in Figure 1 etc., but has a panel center 10B different from that of the ceiling panel 30. The panel center 10B has two grooves 15 that are perpendicular to each other, and four dividing surfaces 16 that are square in plan view due to the two grooves 15. Here, the ceiling panel 30C may have panel peripheries 20A of different widths, similar to the ceiling panel 30A.

[0056] The dividing surface 16 may be a flat surface, or may be a curved surface whose center is convex toward the front side (inside the room), similar to the dividing surface 13 of the ceiling surface material 30B.

[0057] In the ceiling surface material 30C, a swell prevention portion is formed by multiple (two in the illustrated example) grooves 15 and dividing surfaces 16 in which each groove 15 divides the center of the surface material into multiple (four in the illustrated example) parts, thereby preventing swells in the center 10B of the surface material.

[0058] Furthermore, the ceiling surface material 30C has divided surfaces 16 in which the center 10B of the surface material is divided into a plurality of sections by the grooves 15, thereby creating a design that has a sense of unity and contrast.

[0059] [Ceiling surface material according to the fifth embodiment] Next, a ceiling surface material according to a fifth embodiment will be described with reference to Fig. 7. Here, Fig. 7 is a perspective view of an example of the ceiling surface material according to the fifth embodiment.

[0060] The illustrated ceiling panel 30D has a panel peripheral edge 20 similar to that of the ceiling panel 30 shown in Figure 1 etc., but has a panel center 10C that is different from the ceiling panel 30. The panel center 10C has a protruding ridge 18 that extends along a boundary line 19 with the panel peripheral edge 20 and protrudes toward the front side (inside the room). Here, the ceiling panel 30D may have a panel peripheral edge 20A of a different width, similar to the ceiling panel 30A.

[0061] In the ceiling panel 30D, ribs 18 form a rib prevention section, preventing ribbing at the panel center 10C. In addition, in the ceiling panel 30D, ribs 18 extending along the boundary line 19 between the panel center 10C and the panel periphery 20 create a unified and contrasting design.

[0062] [Building ceiling] Next, the building ceiling will be described with reference to Fig. 8. Fig. 8 is a view of a portion of the building ceiling as seen from diagonally below. Fig. 8 will be described as a form in which the ceiling surface material 30 shown in Fig. 1 and the like is applied. Fig. 8 also shows the ceiling underlayment material 40, and therefore shows the state in which the ceiling surface material 30 is fastened to part, but not all, of the ceiling underlayment material 40.

[0063] As shown in the figure, the ceiling underlayment 40 is composed of a joist 41, a joist support 42, a hanger 43, and a suspension bolt 44. The suspension bolt 44 hangs down from a ceiling beam, deck plate, concrete slab, etc. (not shown), and the hanger 43 is screwed to the suspension bolt 44, and the joist support 42 is supported by the hanger 43. Here, in Fig. 8, to make the drawing easier to see, only a portion of the hanger 43 and the suspension bolt 44 that support the joist support 42 are shown.

[0064] A plurality of fastening holes 14a are provided at various locations on the sill 41, into which the tips of fasteners 50 can be fastened.

[0065] As shown in the figure, the straight portions 21 of the peripheral edges 20 of adjacent ceiling panel materials 30 are overlapped, and corresponding fastening holes 22 in both straight portions 21 are aligned at the overlapping points, and fasteners 50 are fastened to fastening holes 14a in the joist 41 through the aligned fastening holes 22, thereby forming a building ceiling 60.

[0066] In the building ceiling 60 shown in the figure, the peripheral edges 20 of multiple ceiling surface materials 30 are overlapped and fastened to the ceiling base material 40 with fasteners 50 via mutually aligned fastening holes 22, thereby forming a building ceiling 60 with excellent design and excellent fall prevention and safety in the event of an earthquake because the ceiling surface materials 30 are lightweight, and the ceiling surface materials 30 are less likely to swell, resulting in a building ceiling 60 with excellent design.

[0067] Here, there are various forms of fastener 50. For example, in addition to the form in which one fastener 50 is fastened to fastening hole 14a via fastening hole 22 of overlapping straight portions 21 as in the illustrated example, snap buttons may also be applied in which a female snap button is attached to joist 41, and a male snap button inserted through fastening hole 22 of overlapping straight portions 21 is fastened to the female snap button.

[0068] The illustrated building ceiling 60 may be applied to either a temporary building or a permanent building. Temporary buildings include temporary arenas for outdoor events, temporary housing that requires rapid construction after an earthquake, temporary accommodation facilities, etc. Permanent buildings include large stores such as commercial facilities and leisure facilities, factories, office buildings (system ceilings), medical and welfare facilities, government buildings, hotels and accommodation facilities, educational facilities, etc.

[0069] The configurations of the above-described embodiments may be combined with other components, and the present invention is not limited to the configurations shown here. In this regard, the present invention may be modified within the scope of the spirit of the present invention, and may be appropriately determined depending on the application form. [Explanation of symbols]

[0070] 10, 10A, 10B, 10C: Center of surface material 11: Convex curved surface toward the interior (curved surface, anti-swelling part) 12: Fold line 13: Divided surface (curved surface) 14: Swell prevention part 15: Groove 16: Divided surface (flat surface, curved surface) 17: Swell prevention part 18: Convex strip (anti-swelling part) 19: Boundary Line 20, 20A: Face material periphery 21: Straight section 21A: Wide straight section (straight section) 21B: Narrow straight section (straight section) 22: Fastening hole 24: Engraving 30, 30A, 30B, 30C: Ceiling surface material (pulp molded product) 40: Ceiling underlayment 41: Rough lining (ceiling underlayment) 41a: Fastening hole 42: Roof joist support (ceiling underlayment material) 43: Hanger (ceiling underlayment) 44: Hanging bolt (ceiling base material) 45: Fastening hole 50: Fastener 60: Building ceiling

Claims

1. A ceiling surface material that is attached to a ceiling substrate to form a building ceiling, The ceiling surface material has a surface material center and a surface material periphery that is a periphery of the surface material center, The center of the face material is provided with a ripple prevention portion, the ceiling surface material is a pulp molded product formed from a material containing an inorganic material, a resin material, and pulp fiber, The swell prevention portion is a ceiling surface material characterized in that the center of the surface material is a curved surface that convexly faces the interior side of the room.

2. A ceiling surface material that is attached to a ceiling substrate to form a building ceiling, The ceiling surface material has a surface material center and a surface material periphery that is a periphery of the surface material center, The center of the face material is provided with a ripple prevention portion, the ceiling surface material is a pulp molded product formed from a material containing an inorganic material, a resin material, and pulp fiber, The swell prevention portion is a divided surface formed by dividing the center of the panel into multiple sections by one or more fold lines, and the center of each divided surface is a curved surface that is convex toward the inside of the room.

3. A ceiling surface material that is attached to a ceiling substrate to form a building ceiling, The ceiling surface material has a surface material center and a surface material periphery that is a periphery of the surface material center, The center of the face material is provided with a ripple prevention portion, the ceiling surface material is a pulp molded product formed from a material containing an inorganic material, a resin material, and pulp fiber, A ceiling surface material characterized in that the swell prevention portion is one or more grooves and a dividing surface in which the center of the surface material is divided into multiple parts by the grooves.

4. A ceiling surface material that is attached to a ceiling substrate to form a building ceiling, The ceiling surface material has a surface material center and a surface material periphery that is a periphery of the surface material center, The center of the face material is provided with a ripple prevention portion, the ceiling surface material is a pulp molded product formed from a material containing an inorganic material, a resin material, and pulp fiber, A ceiling surface material characterized in that the swell prevention portion is a convex ridge extending along the boundary line between the center of the surface material and the periphery of the surface material and convex toward the interior side.

5. The ceiling panel according to claim 1 , wherein the thickness of the peripheral edge of the panel is thinner than that of the center of the panel.

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