Tatami mat
The mat design with an impregnated adhesive region in the cardboard plate portion addresses corner deformation and part count issues, enhancing strength and cost-effectiveness.
Patent Information
- Application Number
- PCT/JP2024/041191
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-01-23
- Filing Date
- 2024-11-20
- Publication Date
- 2025-07-31
AI Technical Summary
Existing mats with corner holding members increase the number of parts, leading to higher costs and potential deformation issues at the corners.
A mat design that incorporates an impregnated region with adhesive in the cardboard plate portion, including the corners, to enhance corner strength and reduce part count, using a corrugated cardboard structure with alternating valley and ridge lines and a hot melt adhesive for easy application.
The design effectively suppresses corner deformation while minimizing the number of parts, reducing costs and maintaining structural integrity.
Smart Images
Figure JP2024041191_31072025_PF_FP_ABST
Abstract
Description
tatami
[0001] This application claims priority to Japanese Application No. 2024-8266, filed January 23, 2024, and incorporates by reference all of the contents of said Japanese application.
[0002] A tatami mat comprising a laminated cardboard, corner retaining members, and a tatami facing is known (see, for example, Patent Document 1). In the tatami mat described in Patent Document 1, the tatami facing covers the laminated cardboard and the corner retaining members. In the laminated cardboard, multiple pieces of corrugated cardboard are stacked in the thickness direction.
[0003] The corner retaining members are inserted between two adjacent pieces of corrugated cardboard in the thickness direction at the corners of the laminated corrugated cardboard, thereby preventing deformation of the corners of the tatami mat.
[0004] Japanese Patent Application Laid-Open No. 2001-32512
[0005] The tatami mat described in Patent Document 1 requires corner holding members in addition to the corrugated cardboard. This increases the number of parts required for the tatami mat described in Patent Document 1. The increased number of parts increases costs.
[0006] The present disclosure provides a tatami mat in which deformation of the corners is suppressed while an increase in the number of parts is suppressed.
[0007] A tatami mat according to the present disclosure comprises a corrugated cardboard plate including a first main surface and a second main surface located opposite the first main surface, and a tatami facing covering the entire first main surface and at least a portion of the second main surface. When viewed in the thickness direction of the corrugated cardboard plate, the outer edge of the corrugated cardboard plate includes a first linear portion along a first line, a second linear portion along a second line intersecting the first line, and a corner portion connecting the first linear portion and the second linear portion. An impregnated region, which is an area impregnated with adhesive, is formed in the corrugated cardboard plate, including the corner portion.
[0008] The tatami mat of the present disclosure prevents deformation of the corners while also preventing an increase in the number of parts.
[0009] FIG. 1 is a plan view of a tatami mat according to one embodiment of the present disclosure. In FIG. 1, impregnated areas are indicated by hatching. FIG. 2 is a side cross-sectional view including a corner of the tatami mat shown in FIG. 1. FIG. 2 is a cross-sectional view taken along line XX in FIG. 1. FIG. 3 is a cross-sectional view of the tatami mat shown in FIG. 2. FIG. 3 is a cross-sectional view taken along line YY in FIG. 2. FIG. 4 is a perspective view of a corner of the tatami mat shown in FIG. 3. In FIG. 4, the first insulating material, the second insulating material, the water-stopping material, and the tatami facing have been omitted. FIG. 5 is a side cross-sectional view of a modified tatami mat. FIG. 6 is a side cross-sectional view of a modified tatami mat. FIG. 7 is a side cross-sectional view of a modified tatami mat. FIG. 8 is a plan cross-sectional view of a modified tatami mat. FIG. 9 is a plan cross-sectional view of a modified tatami mat. FIG. 10 is a plan cross-sectional view of a modified tatami mat. FIG. 10 shows a further modification of FIG. 9. FIG. 11 is a plan view of a modified tatami mat. FIG. 12 is a partially enlarged view of the plan view of the modified tatami mat. FIG. 13 is a partially enlarged view of the plan view of the modified tatami mat.
[0010] [Summary of the embodiment] A tatami mat according to the present disclosure comprises a corrugated cardboard plate including a first main surface and a second main surface located opposite the first main surface, and a tatami facing covering the entire first main surface and at least a portion of the second main surface. When viewed in the thickness direction of the corrugated cardboard plate, the outer edge of the corrugated cardboard plate includes a first linear portion along a first line, a second linear portion along a second line that intersects with the first line, and a corner portion connecting the first linear portion and the second linear portion. An impregnated region, which is an area impregnated with adhesive, is formed in the corrugated cardboard plate so as to include the corner portion.
[0011] When the tatami facing covers the entire first main surface and at least a portion of the second main surface, a relatively large force is applied to the corners of the corrugated cardboard plate. This makes the corners prone to deformation. In the tatami mat according to the present disclosure, an impregnated area including the corners is formed in the corrugated cardboard plate. This increases the strength of the corners and suppresses deformation of the corners. Strength includes rigidity. The tatami mat of the present disclosure is not configured in such a way that separate corner holding members are inserted into the corrugated cardboard plate, as described in Patent Document 1, but rather has an impregnated area impregnated with adhesive formed in the corrugated cardboard plate. This suppresses an increase in the number of parts, thereby reducing costs. As a result, this tatami mat suppresses deformation of the corners while suppressing an increase in the number of parts.
[0012] In the tatami mat described above, the corrugated cardboard plate portion includes a corrugated cardboard plate. The corrugated cardboard plate includes a sheet and a corrugated portion. The corrugated portion includes valleys and ridges that each extend along a first direction. The valleys and ridges are arranged alternately in a direction perpendicular to the first direction and the thickness direction of the corrugated cardboard plate portion. The valleys are joined to the sheet. The impregnated region is formed to include a region of the outer edge that extends in the first direction.
[0013] The area of the outer edge that intersects with the first direction has lower mechanical strength than the area of the outer edge that extends in the first direction, and is therefore more susceptible to deformation. However, in this tatami mat, the impregnation area is formed to include the area of the outer edge that extends in the first direction, so deformation of the area of the outer edge that extends in the first direction is suppressed while also suppressing an increase in the number of parts.
[0014] In the above-mentioned tatami mat, the corrugated cardboard may further include a second sheet located on the opposite side of the corrugated portion to the first sheet and joined to the ridge line portion. The second sheet increases the strength of the corrugated cardboard and suppresses deformation.
[0015] In the above-mentioned tatami mat, the corrugated board portion may include only one corrugated board. This tatami mat can be made thin. Therefore, the tatami mat is suitable for use as a tatami mat. A tatami mat is placed on top of a flooring material.
[0016] In the above-mentioned tatami mat, the corrugated cardboard plate portion may include a plurality of corrugated cardboard plates stacked in the thickness direction. This can increase the strength of the corrugated cardboard plate portion and further suppress deformation. The tatami mat is preferably used as an inset tatami mat.
[0017] In the above-mentioned tatami mat, the adhesive may be a hot melt adhesive. Since the adhesive is a hot melt adhesive, application is easy. Since the hot melt adhesive is solid at 25°C (room temperature), it can sufficiently improve the strength of the corners and suppress deformation of the corners.
[0018] In the above-mentioned tatami mat, the corrugated board portion may have a polygonal shape when viewed in the thickness direction. Since the corrugated board portion has a polygonal shape, the tatami mat can be easily installed.
[0019] In the above-mentioned tatami mat, the corrugated board portion may have a rectangular shape when viewed in the thickness direction. Since the corrugated board portion has a rectangular shape, the tatami mat can be easily installed.
[0020] In the above-mentioned tatami mat, the corrugated board portion may be made of paper. If the corrugated board portion is made of paper, the tatami mat will be light.
[0021] [Specific example of embodiment] A specific example of a tatami mat according to the present disclosure will be described with reference to Figures 1 to 4. Figure 1 is a plan view of a tatami mat according to one embodiment of the present disclosure. In Figure 1, the impregnated area is indicated by hatching. Figure 2 is a side cross-sectional view including a corner of the tatami mat shown in Figure 1. Figure 2 is a cross-sectional view taken along line XX in Figure 1. Figure 3 is a plan cross-sectional view of the tatami mat shown in Figure 2. Figure 3 is a cross-sectional view taken along line YY in Figure 2. Figure 4 is a perspective view of a corner of the tatami mat shown in Figure 3. In Figure 4, the first insulating material, second insulating material, water-stopping material, and tatami facing are omitted.
[0022] [Configuration of Tatami Mat] As shown in Figure 1, the tatami mat 1 has a flat plate shape. When viewed in the thickness direction TD (see Figure 2), the tatami mat 1 has a polygonal shape. Specifically, when viewed in the thickness direction TD, the tatami mat 1 has a rectangular shape. As shown in Figure 2, the tatami mat 1 comprises a corrugated cardboard plate portion 2, a first insulating material 3, a second insulating material 4, a water-stopping material 5, and a tatami facing 6.
[0023] [Corrugated cardboard plate portion 2] The corrugated cardboard plate portion 2 has the same shape as the tatami mat 1 when viewed in the thickness direction TD. The corrugated cardboard plate portion 2 has a thickness. The corrugated cardboard plate portion 2 has a plate shape. The corrugated cardboard plate portion 2 is a backing material for the tatami mat facing 6. As shown in Figures 2 and 4, the corrugated cardboard plate portion 2 includes a first main surface 21 and a second main surface 22.
[0024] The first main surface 21 is located at one end of the corrugated cardboard plate portion 2 in the thickness direction TD. The first main surface 21 extends along a plane perpendicular to the thickness direction TD of the corrugated cardboard plate portion 2. In the present disclosure, the first main surface 21 is the upper surface of the corrugated cardboard plate portion 2.
[0025] The second main surface 22 is located on the opposite side to the first main surface 21. The second main surface 22 is located at the other end of the corrugated cardboard section 2 in the thickness direction TD. The second main surface 22 extends along a plane perpendicular to the thickness direction TD. In the present disclosure, the second main surface 22 is the lower surface of the corrugated cardboard section 2.
[0026] 1 and 3 , the corrugated cardboard plate portion 2 has a polygonal shape when viewed in the thickness direction TD. Specifically, the corrugated cardboard plate portion 2 has a rectangular shape when viewed in the thickness direction TD. When viewed in the thickness direction TD of the corrugated cardboard plate portion 2, the outer edge 23 of the corrugated cardboard plate portion 2 includes two first linear portions 24A, 24B, two second linear portions 25A, 25B, and a corner portion 26.
[0027] The two first linear portions 24A and 24B are aligned along the first straight line L1 and are spaced apart from each other. The two first linear portions 24A and 24B are parallel to each other.
[0028] Each of the two second straight line portions 25A, 25B is aligned with a second straight line L2. The second straight line L2 intersects with the first straight line. In the present disclosure, the second straight line L2 is perpendicular to the first straight line L1. The second straight line portion 25A connects one end of the two first straight line portions 24A and 24B in the direction along the first straight line L1. The second straight line portion 25B connects the other end of the two first straight line portions 24A and 24B in the direction along the first straight line L1. The second straight line portions 25A and 25B are parallel to each other.
[0029] The corner portion 26 connects the first linear portions 24A and 24B and the second linear portions 25A and 25B. Specifically, the corner portion 26 includes a plurality of (four) corner portions 261, 262, 263, and 264.
[0030] Corner 261 connects first linear portion 24A and second linear portion 25A. Corner 262 connects first linear portion 24A and second linear portion 25B. Corner 263 connects first linear portion 24B and second linear portion 25A. Corner 264 connects first linear portion 24B and second linear portion 25B. Corners 261 and 264 face each other. Corners 262 and 263 face each other.
[0031] 2 and 4, the corrugated board portion 2 includes a corrugated board 27. In the tatami mat 1 of the present disclosure, the corrugated board portion 2 includes only one corrugated board 27. The corrugated board 27 includes a sheet 271, a corrugated portion 272, and a second sheet 273. This corrugated board 27 is sometimes referred to as double-sided corrugated board.
[0032] <Sheet 271> The sheet 271 is located at one end of the cardboard plate 27 in the thickness direction TD. The sheet 271 is the bottom wall of the cardboard plate 27. The sheet 271 extends along a plane including the first straight line L1 and the second straight line L2. The sheet 271 is sometimes referred to as a back sheet. The sheet 271 forms the second main surface 22 of the cardboard plate portion 2.
[0033] <Wavy portion 272> The wave-shaped portion 272 is located on one side of the sheet 271 in the thickness direction TD. The wave-shaped portion 272 is aligned along a plane including the first straight line L1 and the second straight line L2. The wave-shaped portion 272 is sometimes referred to as a core portion. The wave-shaped portion 272 has a sinusoidal shape (or a zigzag shape). Specifically, the wave-shaped portion 272 includes a plurality of valleys 2721 and a plurality of ridges 2722.
[0034] Each of the multiple valleys 2721 extends along a first direction D1. In the present disclosure, the first direction D1 is, for example, a direction along a first straight line L1. When viewed in the first direction D1, each of the multiple valleys 2721 has a U-shape (or V-shape) that opens toward one side in the thickness direction TD. The valleys 2721 are joined to the sheet 271. Specifically, the bottoms of the valleys 2721 are bonded to the sheet 271 via an adhesive.
[0035] Each of the multiple ridge portions 2722 extends along the first direction D1. The ridge portions 2722 are located on the opposite side of the sheet 271 from the valley portions 2721 when viewed in the thickness direction TD. When viewed in the first direction D1, each of the multiple ridge portions 2722 has a U-shape that opens toward the other side in the thickness direction TD. One ridge portion 2722 connects two valley portions 2721 adjacent to the one ridge portion 2722 in the direction along the second straight line L2.
[0036] In the corrugated portion 272, valleys 2721 and ridges 2722 are alternately arranged in a direction perpendicular to the first direction D1 and the thickness direction TD of the cardboard plate portion 2. In the present disclosure, the direction perpendicular to the first direction D1 is the direction along the second straight line L2. The direction perpendicular to the first direction D1 is the direction along a plane including the first straight line L1 and the second straight line L2.
[0037] <Second sheet 273> The second sheet 273 is located at the other end in the thickness direction TD. The second sheet 273 is the top wall of the cardboard board 27. The second sheet 273 is located on the opposite side of the corrugated portion 272 from the sheet 271. The second sheet 273 extends along a plane including the first straight line L1 and the second straight line L2. The second sheet 273 is sometimes referred to as the front sheet. The second sheet 273 is connected to the ridge portion 2722. Specifically, the second sheet 273 is bonded to the top of the ridge portion 2722 via an adhesive.
[0038] <Size of the Corrugated Cardboard Board 27> The thickness of the corrugated cardboard board 27 is, for example, 1 mm or more and 20 mm or less. The thickness of the sheet 271 is, for example, 0.01 mm or more, preferably 0.1 mm or more, and 3 mm or less, preferably 2 mm or less. The thickness of the wavy portion 272 is, for example, 1 mm or more, preferably 3 mm or more, and 20 mm or less, preferably 5 mm or less. The thickness of the wavy portion 272 is the length from the bottom of the valley portion 2721 to the top of the ridge portion 2722 in the thickness direction TD. The pitch of the wavy portions 272 is, for example, 0.3 mm or more and 10 mm or less. The pitch is the distance along the second straight line L2 from the top of one wavy portion 272 to the top of the wavy portion 272 adjacent to the one wavy portion 272. The thickness of second sheet 273 is, for example, the same as the thickness of sheet 271. Specifically, the thickness of second sheet 273 is 0.01 mm or more, preferably 0.1 mm or more, and 3 mm or less, preferably 2 mm or less.
[0039] <Material of the Corrugated Board Part 2> The corrugated board part 2 is preferably made of paper. However, the corrugated board part 2 may also be made of plastic. Examples of plastic include olefin resin. Examples of olefin resin include polyethylene, polypropylene, and ethylene-propylene copolymer. A plastic corrugated board part 2 may be referred to as corrugated plastic, corrugated plastic, or corrugated plastic.
[0040] [First insulating material 3] As shown in FIG. 2 , the first insulating material 3 is located on the first main surface 21 of the cardboard plate portion 2. Specifically, the first insulating material 3 covers the entire upper surface of the second sheet 273 of the cardboard plate 27. The first insulating material 3 contacts the entire upper surface of the second sheet 273 of the cardboard plate 27. The first insulating material 3 extends in a plane perpendicular to the thickness direction TD. The first insulating material 3 has a sheet shape. The first insulating material 3 is formed, for example, from a resin foam. Examples of materials for the resin foam include polyolefin. The thickness of the first insulating material 3 is, for example, 0.5 mm or more and 5 mm or less.
[0041] [Second insulating material 4] The second insulating material 4 is located on the second main surface 22 of the cardboard plate portion 2. Specifically, the second insulating material 4 covers the entire lower surface of the sheet 271 of the cardboard plate 27. The second insulating material 4 contacts the entire lower surface of the sheet 271 of the cardboard plate 27. The second insulating material 4 extends in a direction perpendicular to the thickness direction TD. The second insulating material 4 has a sheet shape. The second insulating material 4 is formed, for example, from a resin foam. Examples of materials for the resin foam include polyolefin. The thickness of the second insulating material 4 is, for example, 0.5 mm or more and 5 mm or less.
[0042] [Waterstop material 5] The waterstop material 5 is located on the opposite side of the corrugated board portion 2 from the second insulating material 4. Specifically, the waterstop material 5 contacts the center of the underside of the second insulating material 4. The waterstop material 5 also contacts the underside of the tatami facing 6, which is located at the outer edge of the underside of the second insulating material 4. The waterstop material 5 seals the outer edge of the tatami facing 6. The waterstop material 5 extends along a plane perpendicular to the thickness direction TD. The waterstop material 5 has a sheet shape. The material of the waterstop material 5 is rubber. The thickness of the waterstop material 5 is, for example, 0.5 mm or more and 5 mm or less.
[0043] [Tatami facing 6] The tatami facing 6 covers the entire first main surface and at least a portion of the second main surface. Specifically, the tatami facing 6 covers the entire upper surface of the first insulating material 3, the outer peripheral surfaces of the first insulating material 3, the corrugated cardboard plate 2, the second insulating material 4, and the water-stopping material 5, and the outer edge of the lower surface of the water-stopping material 5. The tatami facing 6 contacts the entire upper surface of the first insulating material 3, the outer peripheral surfaces of the first insulating material 3, the corrugated cardboard plate 2, the second insulating material 4, and the water-stopping material 5, and the outer edge of the lower surface of the water-stopping material 5. The material of the tatami facing 6 is a natural material, a chemical material, or a hybrid material. The natural material includes rush. The chemical material includes polyethylene resin. The polyethylene resin includes polypropylene. The hybrid material includes natural and chemical materials. The thickness of the tatami facing 6 is, for example, 0.5 mm or more and 5 mm or less.
[0044] [Impregnated Region 28] Next, the impregnated region 28 will be described. The impregnated region 28 is formed in the corrugated cardboard section 2. The impregnated region 28 is a region impregnated with the adhesive 280. The impregnated region 28 includes a gap S1 partitioned by the corrugated portion 272 and the sheet 271, and a gap S2 partitioned by the corrugated portion 252 and the second sheet 253. In the impregnated region 28, the adhesive 280 may be impregnated (permeated) (contained) (absorbed) into the sheet 271, the corrugated portion 272, and the second sheet 273. The impregnated region 28 is harder than a region not impregnated with the adhesive 280.
[0045] 1 and 3 , the impregnation region 28 includes a first region 281, a second region 282, a third region 283, and a fourth region 284. The first region 281, the second region 282, the third region 283, and the fourth region 284 include four corner portions 26.
[0046] When viewed in the thickness direction, first region 281 includes corner 261. When viewed in the thickness direction, second region 282 includes corner 262. When viewed in the thickness direction, third region 283 includes corner 263. When viewed in the thickness direction, fourth region 284 includes corner 264. When viewed in the thickness direction, first region 281, second region 282, third region 283, and fourth region 284 each have, for example, an L-shape.
[0047] Impregnation region 28 further includes a fifth region 285 and a sixth region 286. Fifth region 285 includes first linear portion 24A. Sixth region 286 includes first linear portion 24B. In other words, impregnation region 28 is formed to include a region of outer edge 23 that extends in first direction D1.
[0048] The fifth region 285 connects the first region 281 and the second region 282. When viewed in the thickness direction, the first region 281, the second region 282, and the fifth region 285 have a U-shape that opens toward the first linear portion 24B. Note that the first region 281 and the fifth region 285 may not be clearly distinguished from each other and may include overlapping portions. The second region 282 and the fifth region 285 may not be clearly distinguished from each other and may include overlapping portions.
[0049] The sixth region 286 connects the third region 283 and the fourth region 284. When viewed in the thickness direction, the sixth region 286, the third region 283, and the fourth region 284 have a U-shape that opens toward the first linear portion 24A. Note that the sixth region 286 and the third region 283 may not be clearly distinguished from each other and may include portions that overlap with each other. The sixth region 286 and the fourth region 284 may not be clearly distinguished from each other and may include portions that overlap with each other.
[0050] <Adhesive 280> The adhesive 280 is a hot melt adhesive or a thermosetting resin. From the viewpoint of ease of application, the adhesive 280 is preferably a hot melt adhesive. The hot melt adhesive contains a thermoplastic resin. Examples of hot melt adhesives include ethylene-vinyl acetate copolymer, polyolefin resin, polyester resin, polyamide resin, acrylic resin, and synthetic rubber. Examples of hot melt adhesives include ethylene-vinyl acetate copolymer and polyolefin resin. The polyolefin resin contains paraffin that is solid at 25°C. The blending ratio of the ethylene-vinyl acetate copolymer to the total amount of the ethylene-vinyl acetate copolymer and the polyolefin resin is 60% by mass or more, preferably 70% by mass or more, and 99% by mass or less, preferably 90% by mass or less. The softening point of the adhesive 280 (hot melt adhesive) is 50°C or more, preferably 70°C or more, and 150°C or less. The hot melt adhesive is solid at 25°C.
[0051] The thickness of the tatami mat 1 at the corner 26 is, for example, 5 mm or more and 60 mm or less.
[0052] [Method for manufacturing tatami mat 1] To manufacture tatami mat 1, first, prepare the cardboard board portion 2, the first insulating material 3, the second insulating material 4, the water-stopping material 5, and the tatami facing 6. The impregnation region 28 has not yet been formed in the cardboard board portion 2.
[0053] Next, the first insulating material 3 and the second insulating material 4 are bonded to the first main surface 21 and the second main surface 22 of the cardboard plate portion 2, respectively, via an adhesive.
[0054] Next, the impregnation region 28 is formed in the corrugated cardboard plate portion 2. The adhesive 280 is impregnated into the impregnation region 28. Specifically, the adhesive 280 is impregnated into the impregnation region 28 using a melter (hot melter) filled with pellets made of the raw material of the adhesive 280. Specifically, the adhesive 280 is injected from the outside into each of the two first linear portions 24A and 24B and each of the four corner portions 261, 262, 263, and 264 using the melter. The heating temperature of the melter exceeds the softening point of the adhesive 280.
[0055] The adhesive 280 is then cooled. Specifically, the adhesive 280 is left at, for example, 25°C. This causes the adhesive 280 to lose its fluidity. The corrugated cardboard board portion 2, the first insulating material 3, the second insulating material 4, and the water-stopping material 5 are then covered with the tatami facing 6. At this time, it is acceptable for a fairly large force to be applied to each of the four corners 261, 262, 263, and 264 of the corrugated cardboard board portion 2.
[0056] Thereafter, the waterproof material 5 is placed on the underside of the second insulating material 4 and the tatami mat 6 .
[0057] [Modifications] Modifications of tatami mats will be described with reference to Figures 5 to 13. Figure 5 is a side cross-sectional view of a modified tatami mat. Figure 6 is a side cross-sectional view of a modified tatami mat. Figure 7 is a side cross-sectional view of a modified tatami mat. Figure 8 is a plan cross-sectional view of a modified tatami mat. Figure 9 is a plan cross-sectional view of a modified tatami mat. Figure 10 is a plan cross-sectional view of a modified tatami mat. Figure 10 shows a further modification of Figure 9. Figure 11 is a plan view of a modified tatami mat. Figure 12 is a partially enlarged view of the plan view of a modified tatami mat. Figure 13 is a partially enlarged view of the plan view of a modified tatami mat.
[0058] 5, the corrugated board 27 may include only the sheet 271 and the corrugated portion 272, without including the second sheet 273. This corrugated board 27 may be referred to as single-faced corrugated board.
[0059] As shown in Figures 6 and 7, the corrugated cardboard plate unit 2 may include multiple corrugated cardboard plates 27 stacked in the thickness direction TD. Specifically, the corrugated cardboard plate unit 2 includes a corrugated cardboard plate 27A and a corrugated cardboard plate 27B in this order in the thickness direction TD. In the modified example of Figure 6, each of the corrugated cardboard plates 27A and 27B includes a sheet 271, a corrugated portion 272, and a second sheet 273. In the modified example of Figure 7, the corrugated cardboard plate 27A includes the sheet 271 and the corrugated portion 272. The corrugated cardboard plate 27B includes the sheet 271, the corrugated portion 272, and the second sheet 273.
[0060] 8 , the first region 281, the second region 282, and the fifth region 285 may have linear shapes parallel to the first line L1 and the first direction T1 when viewed in the thickness direction, while the sixth region 286, the third region 283, and the fourth region 284 may have linear shapes parallel to the first line L1 and the first direction T1 when viewed in the thickness direction.
[0061] 9 , the impregnation region 28 may have a frame shape when viewed in the thickness direction. Specifically, the impregnation region 28 may further include a seventh region 287 and an eighth region 288. The seventh region 287 and the eighth region 288 each extend in a direction perpendicular to the first direction D1. The seventh region 287 connects the first region 281 and the third region 283. The eighth region 288 connects the second region 282 and the fourth region 284. The impregnation region 28 is formed around the entire periphery of the outer edge 23.
[0062] As shown in FIG. 10, the first direction D1 may intersect with both the direction along the first straight line L1 and the direction along the second straight line L2.
[0063] As shown in FIG. 11, the impregnation region 28 may not include the fifth region 285 and the sixth region 286, but may include only the first region 281, the second region 282, the third region 283, and the fourth region 284.
[0064] Although not shown, the impregnated region 28 may include at least one region selected from the group consisting of a first region 281 , a second region 282 , a third region 283 , and a fourth region 284 .
[0065] The shape of the impregnation region 28 is not limited to the above. As shown in Fig. 12, the shape of the impregnation region 28 (first region 281) may be rectangular. As shown in Fig. 13, the shape of the impregnation region 28 (first region 281) may be triangular.
[0066] Although not shown, the shape of the corrugated cardboard plate portion 2 when viewed in the thickness direction TD is not limited to the above. The corrugated cardboard plate portion 2 may include corners 26 that are acute or obtuse angles. The corrugated cardboard plate portion 2 may have a polygonal shape (excluding a rectangular shape) when viewed in the thickness direction TD. Polygonal shapes include triangular, pentagonal, and hexagonal shapes. A portion of the outer edge 23 of the corrugated cardboard plate portion 2 may have a curved portion. The curved portion may include an arc.
[0067] The embodiments of the present disclosure are illustrative in all respects and should not be construed as limiting in any respect. The scope of the present invention is defined by the claims, and it is intended to include all modifications within the meaning and scope of the claims.
[0068] 1 Tatami mat, 2 Corrugated cardboard plate portion 21 First main surface, 22 Second main surface, 23 Outer edge, 24A First linear portion, 24B First linear portion, 25A Second linear portion, 25B Second linear portion, 26 Corner portion, 27 Corrugated cardboard plate, 28 Impregnated region, 252 Wave-shaped portion, 253 Second sheet, 261, 262, 263, 264 Corner portion, 271 Sheet, 272 Wave-shaped portion, 273 Second sheet, 280 Adhesive, 281 First region, 282 Second region, 283 Third region, 284 Fourth region, 285 Fifth region, 286 Sixth region, 287 Seventh region, 288 Eighth region, 2721 Valley portion, 2722 Ridge portion, 2822 Sixth region, 3 First insulating material, 4 Second insulating material, 5 Water-stopping material, 6 Tatami mat surface, L1 first straight line, L2 second straight line, P plane, S1 gap, S2 gap, T1 first direction, TD thickness direction.
Claims
1. A cardboard board part including a first main surface and a second main surface located on the opposite side of the first main surface, and a folding cover covering all of the first main surface and at least a part of the second main surface. When viewed in the thickness direction of the cardboard board part, the outer edge of the cardboard board part includes a first straight line part along a first straight line, a second straight line part along a second straight line intersecting the first straight line, and a corner part connecting the first straight line part and the second straight line part. An impregnated area, which is an area impregnated with an adhesive, is formed in the cardboard board part so as to include the corner part. A folding box.
2. The cardboard board part includes a cardboard board. The cardboard board includes a sheet and a corrugated part. The corrugated part includes a valley part and a ridge line part each extending along a first direction, and the valley part and the ridge line part are alternately arranged in the first direction and a direction perpendicular to the thickness direction of the cardboard board part. The valley part is joined to the sheet. The impregnated area is formed so as to include an area extending in the first direction among the outer edges. The folding box according to claim 1.
3. The cardboard board further includes a second sheet located on the opposite side of the sheet with respect to the corrugated part and joined to the ridge line part. The folding box according to claim 2.
4. The cardboard board part includes only one cardboard board. The folding box according to claim 2 or claim 3.
5. The cardboard board part includes a plurality of the cardboard boards laminated in the thickness direction. The folding box according to claim 2 or claim 3.
6. The adhesive is a hot melt adhesive. The folding box according to claim 1 or claim 2.
7. The cardboard board part has a polygonal shape when viewed in the thickness direction. The folding box according to claim 1 or claim 2.
8. The cardboard board part has a rectangular shape when viewed in the thickness direction. The folding box according to claim 1 or claim 2.
9. The cardboard board part is made of paper. The folding box according to claim 1 or claim 2.
Citation Information
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