Tatami
The corrugated cardboard tatami mat with an impregnated adhesive region at the corners addresses the issue of increased parts and deformation by enhancing corner strength and reducing costs.
Patent Information
- Application Number
- JP2024008266
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-01-23
- Publication Date
- 2025-08-04
- Estimated Expiration
- 2044-01-23
AI Technical Summary
Existing tatami mats with corner holding members increase the number of parts, leading to higher costs and potential deformation issues.
A tatami mat design that incorporates a corrugated cardboard plate with an impregnated adhesive region at the corners, eliminating the need for additional corner holding members, thereby reducing parts and enhancing corner strength.
The design suppresses corner deformation while minimizing the number of parts, thus reducing costs and maintaining structural integrity.
Smart Images
Figure 2025113881000001_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to tatami mats.
Background Art
[0002] There is known a tatami mat including laminated corrugated cardboard, a corner holding member, and a tatami mat surface (see, for example, Patent Document 1). In the tatami mat described in Patent Document 1, the tatami mat surface covers the laminated corrugated cardboard and the corner holding member. In the laminated corrugated cardboard, a plurality of corrugated cardboard sheets are laminated in the thickness direction.
[0003] The corner holding member is inserted between two adjacent corrugated cardboard sheets in the thickness direction at the corner of the laminated corrugated cardboard. Thereby, deformation of the corner of the tatami mat is suppressed.
Prior Art Documents
Patent Documents
[0004]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0005] In the tatami mat described in Patent Document 1, a corner holding member is separately provided in addition to the corrugated cardboard sheet. Therefore, in the tatami mat described in Patent Document 1, the number of parts increases. When the number of parts increases, the cost increases.
[0006] The present disclosure provides a tatami mat in which deformation of the corner is suppressed and an increase in the number of parts is suppressed.
Means for Solving the Problems
[0007] The tatami mat according to the present disclosure includes a cardboard plate portion including a first main surface and a second main surface located on the opposite side of the first main surface, and a tatami mat 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 plate portion, the outer edge of the cardboard plate portion includes a first straight line portion along a first straight line, a second straight line portion along a second straight line intersecting the first straight line, and a corner portion connecting the first straight line portion and the second straight line portion. An impregnated region, which is a region impregnated with an adhesive, is formed in the cardboard plate portion so as to include the corner portion.
Advantages of the Invention
[0008] In the tatami mat of the present disclosure, deformation of the corner portion is suppressed while an increase in the number of parts is suppressed.
Brief Description of the Drawings
[0009]
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[0010] [Summary of Embodiment] The tatami mat according to the present disclosure includes a corrugated cardboard plate portion including a first main surface and a second main surface located on the opposite side of the first main surface, and a tatami mat 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 corrugated cardboard plate portion, the outer edge of the corrugated cardboard plate portion includes a first straight line portion along a first straight line, a second straight line portion along a second straight line intersecting the first straight line, and a corner portion connecting the first straight line portion and the second straight line portion. In the corrugated cardboard plate portion, an impregnated region, which is a region impregnated with an adhesive, is formed so as to include the corner portion.
[0011] When the tatami mat cover covers all of the first main surface and at least a part of the second main surface, a relatively large force is applied to the corner portion of the corrugated cardboard plate portion. Then, the corner portion is likely to be deformed. In the tatami mat according to the present disclosure, an impregnated region including the corner portion is formed in the corrugated cardboard plate portion. Therefore, the strength of the corner portion is increased and the deformation of the corner portion is suppressed. The strength includes rigidity. The tatami mat of the present disclosure has a configuration in which an impregnated region impregnated with an adhesive is formed in the corrugated cardboard plate portion, rather than a configuration in which another holding member for the corner portion is inserted into the corrugated cardboard plate portion as described in Patent Document 1. Therefore, an increase in the number of parts is suppressed. Then, the cost can be reduced. As a result, in this tatami mat, while the deformation of the corner portion is suppressed, an increase in the number of parts is suppressed.
[0012] In the tatami mat described above, the corrugated cardboard plate portion includes a corrugated cardboard. The corrugated cardboard includes a sheet and a corrugated portion. The corrugated portion includes a valley portion and a ridge line portion each extending along a first direction. The valley portion and the ridge line portion are alternately arranged in the first direction and a direction perpendicular to the thickness direction of the corrugated cardboard plate portion. The valley portion is joined to the sheet. The impregnated region is formed so as to include a region extending in the first direction of the outer edge.
[0013] Of the outer edges, the region intersecting the first direction has lower mechanical strength than the region extending in the first direction of the outer edge, and thus is more likely to deform. However, in this folded product, the impregnated region is formed to include the region extending in the first direction of the outer edge, so that while the deformation of the region extending in the first direction of the outer edge is suppressed, an increase in the number of parts is suppressed.
[0014] In the folded product described above, the cardboard sheet may further include a second sheet located on the opposite side of the sheet with respect to the corrugated portion and joined to the ridge line portion. The second sheet can increase the strength of the cardboard sheet and suppress deformation.
[0015] In the folded product described above, the cardboard sheet portion may include only one cardboard sheet. This folded product can be made thin. Therefore, the folded product is preferably used as a stacked folded product. The stacked folded product is placed on the upper surface of the floor material.
[0016] In the folded product described above, the cardboard sheet portion may include a plurality of cardboard sheets laminated in the thickness direction. The strength of the cardboard sheet portion can be made higher, and deformation can be further suppressed. The folded product is preferably used as an inserted folded product.
[0017] In the folded product described above, the adhesive may be a hot melt adhesive. Since the adhesive is a hot melt adhesive, the construction is easy. Since the hot melt adhesive has a solid shape at 25°C (room temperature), the strength of the corners can be sufficiently improved, and the deformation of the corners can be suppressed.
[0018] In the folded product described above, the cardboard sheet portion may have a polygonal shape when viewed in the thickness direction. Since the cardboard sheet portion has a polygonal shape, the construction of the folded product is easy.
[0019] In the folded product described above, the cardboard sheet portion may have a rectangular shape when viewed in the thickness direction. Since the cardboard sheet portion has a rectangular shape, the construction of the folded product is easy.
[0020] In the tatami described above, the cardboard plate portion may be made of paper. If the cardboard plate portion is made of paper, the tatami is light.
[0021] [Specific Examples of Embodiments] With reference to FIGS. 1 to 4, specific examples of the tatami of the present disclosure will be described. FIG. 1 is a plan view of a tatami according to an embodiment of the present disclosure. In FIG. 1, the invasion region is shown by hatching. FIG. 2 is a side sectional view including a corner portion of the tatami shown in FIG. 1. FIG. 2 is a sectional view taken along line XX of FIG. 1. FIG. 3 is a plan sectional view of the tatami shown in FIG. 2. FIG. 3 is a sectional view taken along line YY of FIG. 2. FIG. 4 is a perspective view of a corner portion of the tatami shown in FIG. 3. In FIG. 4, the first heat insulating material, the second heat insulating material, the water stop material, and the tatami surface are omitted.
[0022] [Configuration of Tatami] As shown in FIG. 1, the tatami 1 has a flat plate shape. The tatami 1 has a polygonal shape when viewed in the thickness direction TD (see FIG. 2). Specifically, the tatami 1 has a rectangular shape when viewed in the thickness direction TD. As shown in FIG. 2, the tatami 1 includes a cardboard plate portion 2, a first heat insulating material 3, a second heat insulating material 4, a water stop material 5, and a tatami surface 6.
[0023] [Cardboard Plate Portion 2] The cardboard plate portion 2 has the same shape as the tatami 1 when viewed in the thickness direction TD. The cardboard plate portion 2 has a thickness. The cardboard plate portion 2 has a plate shape. The cardboard plate portion 2 is a backing material for the tatami surface 6. As shown in FIGS. 2 and 4, the 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 portion of the cardboard plate portion 2 in the thickness direction TD. The first main surface 21 extends along a plane orthogonal to the thickness direction TD of the cardboard plate portion 2. In the present disclosure, the first main surface 21 is the upper surface of the 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 portion of the cardboard plate portion 2 in the thickness direction TD. The second main surface 22 extends along a plane orthogonal to the thickness direction TD of the cardboard plate portion 2. In the present disclosure, the second main surface 22 is the lower surface of the cardboard plate portion 2.
[0026] As shown in FIGS. 1 and 3, the cardboard plate portion 2 has a polygonal shape when viewed in the thickness direction TD. Specifically, the cardboard plate portion 2 has a rectangular shape (a rectangular shape) when viewed in the thickness direction TD. When viewed in the thickness direction TD of the cardboard plate portion 2, the outer edge 23 of the cardboard plate portion 2 includes two first straight portions 24A, 24B, two second straight portions 25A, 25B, and a corner portion 26.
[0027] Each of the two first straight portions 24A and 24B extends along the first straight line L1. The two first straight portions 24A and 24B are arranged at intervals. The two first straight portions 24A and 24B are parallel.
[0028] Each of the two second straight portions 25A, 25B extends along the second straight line L2. The second straight line L2 intersects the first straight line. In the present disclosure, the second straight line L2 is orthogonal to the first straight line L1. The second straight portion 25A connects one end portions of the two first straight portions 24A and 24B in the direction along the first straight line L1. The second straight portion 25B connects the other end portions of the two first straight portions 24A and 24B in the direction along the first straight line L1. The second straight portions 25A and 25B are parallel.
[0029] The corner portion 26 connects the first straight portions 24A, 24B, the second straight portions 25A and 25B. Specifically, the corner portion 26 includes a plurality (four) of corner portions 261, 262, 263, 264.
[0030] The corner portion 261 connects the first straight portion 24A and the second straight portion 25A. The corner portion 262 connects the first straight portion 24A and the second straight portion 25B. The corner portion 263 connects the first straight portion 24B and the second straight portion 25A. The corner portion 264 connects the first straight portion 24B and the second straight portion 25B. The corner portions 261 and 264 face each other. The corner portions 262 and 263 face each other.
[0031] [Cardboard plate portion 2] As shown in FIGS. 2 and 4, the cardboard plate portion 2 includes a cardboard plate 27. In the folding box 1 of the present disclosure, the cardboard plate portion 2 includes only one cardboard plate 27. The cardboard plate 27 includes a sheet 271, a corrugated portion 272, and a second sheet 273. This cardboard plate 27 may be referred to as double-sided cardboard.
[0032] <Sheet 271> The sheet 271 is located at the other 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 a first straight line L1 and a second straight line L2. The sheet 271 may be referred to as a back sheet. The sheet 271 forms the second main surface 22 of the cardboard plate portion 2.
[0033] <Corrugated portion 272> The corrugated portion 272 is located on one side of the sheet 271 in the thickness direction TD. The corrugated portion 272 extends along a plane including a first straight line L1 and a second straight line L2. The corrugated portion 272 may be referred to as a core portion. The corrugated portion 272 includes a sine wave shape (or a zigzag shape). Specifically, the corrugated portion 272 includes a plurality of valley portions 2721 and a plurality of ridge line portions 2722.
[0034] Each of the plurality of valley portions 2721 extends along a first direction D1. In the present disclosure, the first direction D1 is, for example, a direction along the first straight line L1. Each of the plurality of valley portions 2721 has a U-shaped (or V-shaped) opening toward one side of the thickness direction TD when viewed in the first direction D1. The valley portion 2721 is joined to the sheet 271. Specifically, the bottom of the valley portion 2721 is adhered to the sheet 271 via an adhesive.
[0035] Each of the plurality of ridge portions 2722 extends along the first direction D1. The ridge portion 2722 is located on the opposite side of the sheet 271 with respect to the valley portion 2721 when viewed in the thickness direction TD. Each of the plurality of ridge portions 2722 has a U-shaped configuration that opens toward the other side in the thickness direction TD when viewed in the first direction D1. 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, the valley portions 2721 and the ridge portions 2722 are alternately arranged in the first direction D1 and in the direction perpendicular to 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 the plane including the first straight line L1 and the second straight line L2.
[0037] <The 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 plate 27. The second sheet 273 is located on the opposite side of the sheet 271 with respect to the corrugated portion 272. The second sheet 273 extends along the plane including the first straight line L1 and the second straight line L2. The second sheet 273 may be referred to as the front sheet. The second sheet 273 is connected to the ridge portion 2722. Specifically, the second sheet 273 is adhered to the top of the ridge portion 2722 via an adhesive.
[0038] <The size of the cardboard plate 27> The thickness of the cardboard sheet 27 is, for example, 1 mm or more and 20 mm or less. The thickness of the sheet 271 is 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 corrugated 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 corrugated portion 272 is the length from the bottom of the valley portion 2721 to the top of the ridge line portion 2722 in the thickness direction TD. The pitch of the corrugated portion 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 corrugated portion 272 to the top of the corrugated portion 272 adjacent to the one corrugated portion 272. The thickness of the second sheet 273 is, for example, the same as the thickness of the sheet 271. Specifically, the thickness of the 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 cardboard sheet portion 2> The cardboard sheet portion 2 is preferably made of paper. Note that the cardboard sheet portion 2 may be made of plastic. Examples of the plastic include olefin resins. Olefin resins include polyethylene, polypropylene, and ethylene - propylene copolymers. The plastic - made cardboard sheet portion 2 may be referred to as cardboard plastic, plastic cardboard, or plastic - cardboard.
[0040] [First heat insulating material 3] As shown in FIG. 2, the first heat insulating material 3 is located on the first main surface 21 of the cardboard sheet portion 2. Specifically, the first heat insulating material 3 covers the entire upper surface of the second sheet 273 of the cardboard sheet 27. The first heat insulating material 3 is in contact with the entire upper surface of the second sheet 273 of the cardboard sheet 27. The first heat insulating material 3 spreads in a plane orthogonal to the thickness direction TD. The first heat insulating material 3 has a sheet shape. The first heat insulating material 3 is formed from, for example, a resin foam. Examples of the material of the resin foam include polyolefins. The thickness of the first heat insulating material 3 is, for example, 0.5 mm or more and 5 mm or less.
[0041] [Second heat insulating material 4] The second heat insulating material 4 is positioned on the second main surface 22 of the cardboard plate portion 2. Specifically, the second heat insulating material 4 covers the entire lower surface of the sheet 271 of the cardboard plate 27. The second heat insulating material 4 is in contact with the entire lower surface of the sheet 271 of the cardboard plate 27. The second heat insulating material 4 extends in a direction orthogonal to the thickness direction TD. The second heat insulating material 4 has a sheet shape. The second heat insulating material 4 is formed of, for example, a resin foam. Examples of the material of the resin foam include polyolefin. The thickness of the second heat 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 positioned on the opposite side of the cardboard plate portion 2 when viewed from the second heat insulating material 4. Specifically, the waterstop material 5 is in contact with the central portion of the lower surface of the second heat insulating material 4. Further, the waterstop material 5 is also in contact with the lower surface of the tatami cover 6 positioned at the outer end portion of the lower surface of the second heat insulating material 4. The waterstop material 5 seals the outer edge of the tatami cover 6. The waterstop material 5 spreads along a plane orthogonal 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 cover 6] The tatami cover 6 covers the entire first main surface and at least a part of the second main surface. Specifically, the tatami cover 6 covers the entire upper surface of the first heat insulating material 3, the outer peripheral surfaces of the first heat insulating material 3, the cardboard plate portion 2, the second heat insulating material 4, and the waterstop material 5, and the outer end portion of the lower surface of the waterstop material 5. The tatami cover 6 is in contact with the entire upper surface of the first heat insulating material 3, the outer peripheral surfaces of the first heat insulating material 3, the cardboard plate portion 2, the second heat insulating material 4, and the waterstop material 5, and the outer end portion of the lower surface of the waterstop material 5. The material of the tatami cover 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 a natural material and a chemical material. The thickness of the tatami cover 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 cardboard plate portion 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 (may penetrate, may be contained, may be absorbed) into the sheet 271, the corrugated portion 272, and the second sheet 273. The impregnated region 28 is harder than the region where the adhesive 280 is not impregnated.
[0045] As shown in FIGS. 1 and 3, the impregnated 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 corners 26.
[0046] The first region 281 includes the corner 261 when viewed in the thickness direction. The second region 282 includes the corner 262 when viewed in the thickness direction. The third region 283 includes the corner 263 when viewed in the thickness direction. The fourth region 284 includes the corner 264 when viewed in the thickness direction. Each of the first region 281, the second region 282, the third region 283, and the fourth region 284 has, for example, an L shape when viewed in the thickness direction.
[0047] The impregnated region 28 further includes a fifth region 285 and a sixth region 286. The fifth region 285 includes the first straight portion 24A. The sixth region 286 includes the first straight portion 24B. In other words, the impregnated region 28 is formed to include a region extending in the first direction D1 of the outer edge 23.
[0048] The fifth region 285 connects the first region 281 and the second region 282. The first region 281, the second region 282, and the fifth region 285 have a U shape that is open toward the first straight portion 24B when viewed in the thickness direction. Note that the first region 281 and the fifth region 285 may not be clearly distinguished and may include overlapping portions. The second region 282 and the fifth region 285 may not be clearly distinguished and may include overlapping portions.
[0049] The sixth region 286 connects the third region 283 and the fourth region 284. The sixth region 286, the third region 283, and the fourth region 284 have a U-shaped form that opens toward the first straight portion 24A when viewed in the thickness direction. Note that the sixth region 286 and the third region 283 may not be clearly distinguishable and may include overlapping portions. The sixth region 286 and the fourth region 284 may not be clearly distinguishable and may include overlapping portions.
[0050] <Adhesive 280> The adhesive 280 is a hot melt adhesive or a thermosetting resin. From the viewpoint of easy application, the adhesive 280 is preferably a hot melt adhesive. The hot melt adhesive contains a thermoplastic resin. Examples of the hot melt adhesive include an ethylene-vinyl acetate copolymer, a polyolefin resin, a polyester resin, a polyamide resin, an acrylic resin, and a synthetic rubber. Preferably, the hot melt adhesive includes an ethylene-vinyl acetate copolymer and a polyolefin resin. The polyolefin resin includes paraffin having a solid form at 25°C. The blending ratio of the ethylene-vinyl acetate copolymer with respect 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 has a solid form at 25°C.
[0051] The thickness of the first tatami at the corner 26 is, for example, 5 mm or more and 60 mm or less.
[0052] [Method for manufacturing the first tatami] To manufacture the first tatami, first, a cardboard plate portion 2, a first heat insulating material 3, a second heat insulating material 4, a water stop material 5, and a tatami surface 6 are each prepared. The impregnation region 28 is not yet formed in the cardboard plate portion 2.
[0053] Next, the first main surface 21 and the second main surface 22 of the cardboard plate portion 2 are each adhered to the first heat insulating material 3 and the second heat insulating material 4 via an adhesive.
[0054] Next, an impregnation region 28 is formed in the cardboard plate portion 2. The adhesive 280 is impregnated into the impregnation region 28. Specifically, using a melter (hot melter) filled with pellets made of the raw material of the adhesive 280, the above-described adhesive 280 is impregnated into the impregnation region 28. Specifically, using the melter, the adhesive 280 is injected from the outside into each of the two first straight portions 24A and 24B and each of the four corner portions 261, 262, 263, and 264. The heating temperature of the melter exceeds the softening point of the adhesive 280.
[0055] Thereafter, the adhesive 280 is cooled. Specifically, the adhesive 280 is left to stand at, for example, 25°C. As a result, the adhesive 280 loses its fluidity. Thereafter, with the tatami cover 6, the cardboard plate portion 2, the first heat insulating material 3, the second heat insulating material 4, and the water stop material 5 are covered. At this time, it is allowed that a force of a certain magnitude is applied to each of the four corner portions 261, 262, 263, and 264 of the cardboard plate portion 2.
[0056] Thereafter, the water stop material 5 is disposed on the second heat insulating material 4 and the lower surface of the tatami cover 6.
[0057] [Modification Example] With reference to FIGS. 5 to 13, a modification example of the tatami will be described. FIG. 5 is a side cross-sectional view of the modified tatami. FIG. 6 is a side cross-sectional view of the modified tatami. FIG. 7 is a side cross-sectional view of the modified tatami. FIG. 8 is a plan cross-sectional view of the modified tatami. FIG. 9 is a plan cross-sectional view of the modified tatami. FIG. 10 is a plan cross-sectional view of the modified tatami. FIG. 10 shows a further modification example of FIG. 9. FIG. 11 is a plan view of the modified tatami. FIG. 12 is a partially enlarged plan view of the modified tatami. FIG. 13 is a partially enlarged plan view of the modified tatami.
[0058] As shown in FIG. 5, the cardboard sheet 27 may include only the sheet 271 and the corrugated portion 272, without including the second sheet 273. This cardboard sheet 27 may be referred to as single-sided cardboard.
[0059] As shown in FIGS. 6 and 7, the cardboard sheet portion 2 may include a plurality of cardboard sheets 27 laminated in the thickness direction TD. Specifically, the cardboard sheet portion 2 includes a cardboard sheet 27A and a cardboard sheet 27B in this order in the thickness direction TD. In the modification of FIG. 6, each of the cardboard sheets 27A and 27B includes a sheet 271, a corrugated portion 272, and a second sheet 273. In the modification of FIG. 7, the cardboard sheet 27A includes a sheet 271 and a corrugated portion 272. The cardboard sheet 27B includes a sheet 271, a corrugated portion 272, and a second sheet 273.
[0060] As shown in FIG. 8, the first region 281, the second region 282, and the fifth region 285 may have a linear shape parallel to the first straight line L1 and the first direction T1 when viewed in the thickness direction. The sixth region 286, the third region 283, and the fourth region 284 may have a linear shape parallel to the first straight line L1 and the first direction T1 when viewed in the thickness direction.
[0061] As shown in FIG. 9, the impregnated region 28 may have a frame shape when viewed in the thickness direction. Specifically, the impregnated region 28 may further include a seventh region 287 and an eighth region 288. Each of the seventh region 287 and the eighth region 288 extends in a direction orthogonal 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 impregnated region 28 is formed over the entire circumference of the outer edge 23.
[0062] As shown in FIG. 10, the first direction D1 may intersect with the direction along the first straight line L1 and the direction along the second straight line L2, respectively.
[0063] As shown in FIG. 11, the impregnated region 28 may include only the first region 281, the second region 282, the third region 283, and the fourth region 284, and may not include the fifth region 285 and the sixth region 286.
[0064] Although not shown, the impregnated region 28 may include at least one selected from the group consisting of the first region 281, the second region 282, the third region 283, and the fourth region 284.
[0065] The shape of the impregnated region 28 is not limited to the above. As shown in FIG. 12, the shape of the impregnated region 28 (the first region 281) may be rectangular. As shown in FIG. 13, the shape of the impregnated region 28 (the first region 281) may be triangular.
[0066] Although not shown, the shape of the cardboard plate portion 2 when viewed in the thickness direction TD is not limited to the above. The cardboard plate portion 2 may include a corner portion 26 that is an acute angle or an obtuse angle. The cardboard plate portion 2 may be polygonal (excluding rectangular) when viewed in the thickness direction TD. The polygon includes a triangle, a pentagon, and a hexagon. A part of the outer edge 23 of the cardboard plate portion 2 may have a curved portion. The curved portion includes an arc.
[0067] It should be understood that all embodiments of the present disclosure are illustrative in all respects and are not restrictive in any way. The scope of the present invention is defined by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims be included.
Explanation of Signs
[0068] 1 tatami, 2-ply cardboard sheet part 21 first main surface, 22 second main surface, 23 outer edge, 24A first straight part, 24B first straight part, 25A second straight part, 25B second straight part, 26 corner part, 27 cardboard sheet, 28 inclusion region, 252 corrugated part, 253 second sheet, 261, 262, 263, 264 corner parts, 271 sheet, 272 corrugated part, 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 part, 2722 ridge line part, 2822 sixth region, 3 first heat insulating material, 4 second heat insulating material, 5 water stop material, 6 tatami surface, L1 first straight line, L2 second straight line, P plane, S1 gap, S2 gap, T1 first direction, TD thickness direction
Claims
1. A corrugated board portion 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 corrugated board portion, the outer edge of the corrugated board portion is A first straight line portion along a first straight line, A second straight line portion along a second straight line intersecting the first straight line, and A corner portion connecting the first straight line portion and the second straight line portion, A fold in which an impregnated region, which is a region impregnated with an adhesive, is formed in the corrugated board portion so as to include the corner portion.
2. The corrugated board portion includes a corrugated board, The corrugated board includes a sheet and a corrugated portion, The corrugated portion is a valley portion and a ridge line portion extending along a first direction, and includes valley portions and ridge line portions alternately arranged in the first direction and a direction perpendicular to the thickness direction of the corrugated board portion, The valley portion is joined to the sheet, The fold according to claim 1, wherein the impregnated region is formed so as to include a region extending in the first direction among the outer edges.
3. The fold according to claim 2, wherein the corrugated board further includes a second sheet located on the opposite side of the sheet with respect to the corrugated portion and joined to the ridge line portion.
4. The fold according to claim 2 or claim 3, wherein the corrugated board portion includes only one corrugated board.
5. The fold according to claim 2 or claim 3, wherein the corrugated board portion includes a plurality of the corrugated boards laminated in the thickness direction.
6. The fold according to claim 1 or claim 2, wherein the adhesive is a hot melt adhesive.
7. The fold according to claim 1 or claim 2, wherein the corrugated board portion has a polygonal shape when viewed in the thickness direction.
8. The fold according to claim 1 or claim 2, wherein the corrugated board portion has a rectangular shape when viewed in the thickness direction.
9. The fold according to claim 1 or claim 2, wherein the corrugated board portion is made of paper.
Citation Information
Patent Citations
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