Folding sheet, sheet, package, and method for folding sheet
The folding sheet design with alternating valley and mountain folds ensures quick and easy unfolding by positioning corners in outer pleated layers, addressing the challenges of conventional sheets.
Patent Information
- Application Number
- JP2024045021
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-03-21
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2044-03-21
AI Technical Summary
Conventional folding sheets are difficult to quickly unfold due to randomly positioned corners and require significant force, especially when folded inward multiple times.
A folding sheet design that alternately repeats valley and mountain folds to create accordion-like sections, ensuring the four corners are located in outermost pleated layers, allowing easy identification and quick unfolding by pulling the corners.
Facilitates rapid deployment by easily locating and unfolding the sheet without requiring much force, improving usability in emergency situations.
Smart Images
Figure 2025145046000001_ABST
Abstract
Description
[Technical Field]
[0001] The present invention relates to a folding sheet, a sheet, a package, and a method for folding a sheet. [Background technology]
[0002] Sheets such as blue tarps are often stored as folded sheets in storage locations such as disaster prevention warehouses. Known types of such folded sheets include sheets folded in half several times (see, for example, Patent Document 1) and sheets folded inward (see, for example, Patent Document 2). [Prior art documents] [Patent documents]
[0003] [Patent Document 1] Utility Model Registration No. 3229040 [Patent Document 2] Japanese Patent Application Publication No. 2020-101061 Summary of the Invention [Problem to be solved by the invention]
[0004] In emergencies such as disasters, it is necessary to quickly deploy the folding sheet. For example, if the roof is damaged by an earthquake, it is necessary to quickly deploy the folding sheet and cover the ceiling to prevent rain leaks.
[0005] In order to quickly unfold a folded sheet, it is effective to pull the four corners of the sheet. However, with conventional folding sheets, the four corners of the sheet are randomly positioned, which means it takes time to find the four corners. Furthermore, with conventional folding sheets, the sheet is folded inward multiple times, which means a large force is required to unfold the sheet and it takes a long time to unfold.
[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a folding sheet, a sheet, a package, and a method for folding a sheet that can be quickly unfolded. [Means for solving the problem]
[0007] [1] The folding sheet according to the present invention is a folding sheet obtained by folding a sheet, the folding sheet having a rectangular base portion that does not include the outer periphery of the sheet, and a folding portion that is folded toward a first surface of the base with respect to the base, the folding portion being a first folding portion in which the sheet is folded by alternately repeating valley folds and mountain folds from the base portion to the first side portion so that a first side portion of the sheet faces the opposite side to a second side portion of the sheet that faces the first side portion, and a second side portion facing the opposite side to the first side portion. a second folding portion in which the sheet is folded from the base to the second side by alternately repeating valley folds and mountain folds; a third folding portion in which the first folding portion and the second folding portion are folded from the base to a third side of the sheet that is perpendicular to the first side and the second side by alternately repeating valley folds and mountain folds; and a fourth folding portion in which the first folding portion and the second folding portion are folded from the base to a fourth side of the sheet that faces the third side by alternately repeating valley folds and mountain folds.
[0008] In this folding sheet, a folding portion having a first folding portion, a second folding portion, a third folding portion, and a fourth folding portion is folded toward a first surface of the base with respect to the base. In the first folding portion, the sheet is folded in an accordion-like (pleated) shape from the base to the first side with the first side facing away from the second side. In the second folding portion, the sheet is folded in an accordion-like shape from the base to the second side with the second side facing away from the first side. In the third folding portion, the first and second folding portions are folded in an accordion-like shape from the base to the third side, and in the fourth folding portion, the first and second folding portions are folded in an accordion-like shape from the base to the fourth side. As a result, when the portions separated by the valley folds and mountain folds of the third and fourth folding portions are pleated portions, the four corners of the sheet are located in the pleated portions located in the outermost layers of the third and fourth folding portions, opposite the base portion. This makes it easy and quick to find the four corners of the sheet. Furthermore, because the sheet is folded accordion-like from the base portion toward the four sides of the sheet, it can be easily and quickly unfolded by pulling the four corners without requiring much force.
[0009] [2] In the folding sheet described in [1], the third folding portion may be folded so that the third side faces the opposite side from the fourth side, and the fourth folding portion may be folded so that the fourth side faces the opposite side from the third side. In this folding sheet, the third folding portion is folded so that the third side faces the opposite side from the fourth side, and the fourth folding portion is folded so that the fourth side faces the opposite side from the third side, so that the four corners of the sheet are located on the surface opposite the base of the folding sheet. This makes it easier and faster to find the four corners of the sheet.
[0010] [3] In the folding sheet described in [1] or [2], the base may be located at the center of the first and second sides of the unfolded sheet in the direction in which they face each other, and at the center of the third and fourth sides of the unfolded sheet. In this folding sheet, since the base is located at the center of the first and second sides of the unfolded sheet in the direction in which they face each other, the first and second folding sections can be easily folded, and the first and second folding sections can be folded in the same way. Furthermore, since the base is located at the center of the third and fourth sides of the unfolded sheet in the direction in which they face each other, the third and fourth folding sections can be easily folded, and the third and fourth folding sections can be folded in the same way.
[0011] [4] In the folding sheet according to any one of [1] to [3], the distances between the valley folds and the mountain folds of the unfolded sheet may be substantially the same in each of the first folding section, the second folding section, the third folding section, and the fourth folding section. In this folding sheet, the distances between the valley folds and the mountain folds of the unfolded sheet are substantially the same in each of the first folding section, the second folding section, the third folding section, and the fourth folding section, so that partial protrusion of the sheet can be prevented in each of the first folding section, the second folding section, the third folding section, and the fourth folding section.
[0012] [5] In the folding sheet according to any one of [1] to [4], the folding portion may be located at substantially the same position as the base when viewed in the thickness direction of the base. In this folding sheet, since the folding portion is located at substantially the same position as the base when viewed in the thickness direction of the base, multiple folding sheets can be laid out closely together without any gaps. This improves the storability of the folding sheet.
[0013] [6] In the folding sheet according to any one of [1] to [5], the base may be rectangular, and the length of the short side of the base may be 1 / 100 to 1 / 3 of the length of the base in the short side direction of the unfolded sheet. In this folding sheet, the length of the short side of the rectangular base is 1 / 100 to 1 / 3 of the length of the base in the short side direction of the unfolded sheet. This prevents the number of folds in the folding section from increasing and the folding sheet from becoming too bulky, and allows the folding sheet to be made more compact.
[0014] [7] The folding sheet according to any one of [1] to [6] may further include fastening parts provided at the four corners of the sheet to fasten the sheet, and when the portions separated by the mountain folds and valley folds of the third and fourth folding parts are pleated parts, the fastening parts may be located in the pleats located in the outermost layers of the first and fourth folding parts on the opposite side from the base. In this folding sheet, the fastening parts provided at the four corners of the sheet are located in the pleats located in the outermost layers of the third and fourth folding parts on the opposite side from the base, making it easy and quick to find the four corners of the sheet.
[0015] [8] In the folding sheet according to any one of [1] to [7], the sheet may not have breathability.
[0016] [9] In the folding sheet according to any one of [1] to [7], the sheet may be breathable.
[0017]
[10] A package according to the present invention includes the foldable sheet according to any one of [1] to [9] and a packaging material for packaging the foldable sheet. In this package, any one of the foldable sheets is packaged in the packaging material, so that the foldable sheet can be quickly unfolded after being removed from the packaging material.
[0018]
[11] A sheet according to the present invention is a sheet used in the folding sheet according to any one of [1] to [9], and includes markings provided at least in part at the folding positions that will become valley folds and mountain folds. Because the sheet has markings provided at least in part at the folding positions that will become valley folds and mountain folds, the sheet can be easily folded when creating a folding sheet or when refolding an unfolded sheet.
[0019]
[12] A sheet folding method according to the present invention is a sheet folding method, which includes folding the sheet by alternately repeating valley folds and mountain folds from a rectangular base not including the outer periphery of the sheet to a first side so that a first side of the sheet faces the opposite side to a second side of the sheet that faces the first side, folding the sheet by alternately repeating valley folds and mountain folds from the base to a second side so that the second side faces the opposite side to the first side, folding the first folded portion folded from the base to the first side and the second folded portion folded from the base to a third side of the sheet that is perpendicular to the first and second sides, by alternately repeating valley folds and mountain folds, and folding the first folded portion and the second folded portion from the base to a fourth side of the sheet that faces the third side, by alternately repeating valley folds and mountain folds.
[0020] In this sheet folding method, the sheet is folded from the base to the first side by alternating valley folds and mountain folds so that the first side faces away from the second side, the sheet is folded from the base to the second side by alternating valley folds and mountain folds so that the second side faces away from the first side, the first and second folding portions are folded from the base to the third side by alternating valley folds and mountain folds, and the first and second folding portions are folded from the base to the fourth side by alternating valley folds and mountain folds. This makes it possible to produce the above-described folded sheet that can be quickly unfolded. [Effects of the Invention]
[0021] The present invention allows for rapid deployment. [Brief explanation of the drawings]
[0022] [Figure 1] FIG. 2 is a plan view of a folding sheet according to the embodiment. [Figure 2] FIG. 2 is a bottom view of the folding sheet shown in FIG. [Figure 3] FIG. 2 is a side view of the folding sheet shown in FIG. [Figure 4] FIG. 2 is a front view of the folding seat shown in FIG. [Figure 5] 2 is a plan view of the folded sheet shown in FIG. 1 when unfolded. FIG. [Figure 6] FIG. 10 is a plan view showing how the first folding portion and the second folding portion are folded. [Figure 7] FIG. 10 is a front view illustrating a state immediately before the first folding portion and the second folding portion are folded. [Figure 8] FIG. 10 is a front view showing a state in which the first folding portion and the second folding portion are folded. [Figure 9] FIG. 10 is a front view showing how to fold the third folding portion and the fourth folding portion. [Figure 10] FIG. 10 is a side view illustrating a state immediately before the third folding portion and the fourth folding portion are folded. [Figure 11] FIG. 10 is a side view of a package in which the folded sheet is wrapped in a wrapping material. [Figure 12] FIG. 10 is a plan view of a folding sheet according to a modified example. [Figure 13] FIG. 13 is a side view of the folding sheet shown in FIG. [Figure 14] 13 is a plan view of the folded sheet shown in FIG. 12 when unfolded. FIG. [Figure 15] 13 is a plan view showing the folded sheet shown in FIG. 12 with the end pleats unfolded. FIG. [Figure 16] 13 is a side view showing the folded sheet shown in FIG. 12 with the end pleats unfolded. FIG. DETAILED DESCRIPTION OF THE INVENTION
[0023] Hereinafter, a folding sheet, a sheet, a package, and a folding method for a sheet according to embodiments will be described with reference to the drawings. Note that the same or corresponding elements in each drawing are designated by the same reference numerals, and redundant explanations will be omitted.
[0024] (folding seats and seats) FIG. 1 is a plan view of a folding sheet according to an embodiment. FIG. 2 is a bottom view of the folding sheet shown in FIG. 1. FIG. 3 is a side view of the folding sheet shown in FIG. 1. FIG. 4 is a front view of the folding sheet shown in FIG. 1. FIG. 5 is a plan view of the folding sheet shown in FIG. 1 unfolded. As shown in FIGS. 1 to 5, folding sheet 1 according to this embodiment is formed by folding sheet 100. Sheet 100 is a flexible sheet-like member. Sheet 100 may be breathable or non-breathable. Sheet 100 may also have a mesh or no mesh. Examples of such sheet 100 include a breathable resin sheet with no mesh, a breathable net sheet such as a net, a laminate sheet (blue sheet) in which resin fiber or net is laminated with a film to eliminate the breathability and mesh, and a breathable cloth sheet such as a woven or nonwoven fabric.
[0025] Sheet 100 is the unfolded sheet of folding sheet 1. Sheet 100 is also the sheet before it is folded into folding sheet 1. Sheet 100 is formed in a substantially rectangular shape. The term "substantially rectangular shape" refers not only to a rectangular shape but also to a shape that has been deformed due to manufacturing errors, changes over time, and the like.
[0026] The sheet 100 has four sides: a first side 101 and a second side 102 that face a first direction D1, and a third side 103 and a fourth side 104 that face a second direction D2 that is perpendicular to the first direction D1. The first direction D1 is also the direction in which the first side 101 and the second side 102 face each other, and the second direction D2 is also the direction in which the third side 103 and the fourth side 104 face each other.
[0027] The sheet 100 also has four corners: a first corner 105 located at the corner between the first side portion 101 and the third side portion 103; a second corner 106 located at the corner between the third side portion 103 and the second side portion 102; a third corner 107 located at the corner between the second side portion 102 and the fourth side portion 104; and a fourth corner 108 located at the corner between the fourth side portion 104 and the first side portion 101.
[0028] The first corner 105, the second corner 106, the third corner 107, and the fourth corner 108 each have a fixing portion 131 for fixing the sheet. Examples of the fixing portion 131 include holes such as eyelets, buttonholes, and joint holes, loop-shaped carry handles, and protrusions such as linear ropes. Note that such fixing portions 131 may be provided not only at the first corner 105, the second corner 106, the third corner 107, and the fourth corner 108, but also along the first side 101, the second side 102, the third side 103, and the fourth side 104. In this embodiment, as an example, grommets are provided at the four corners of the sheet 100 as fixing portions 131, but the grommets may be optionally replaced with the holes and / or protrusions described above.
[0029] The folding sheet 1 has a rectangular base 2 that does not include the outer periphery of the sheet 100, and a folding portion 3 that is folded relative to the base 2 toward a first surface 21 of the base 2. The first surface 21 is one of the front and back surfaces of the sheet 100.
[0030] The base 2 is formed in a rectangular shape. That is, the base 2 is formed in a rectangular shape when viewed in the thickness direction of the base 2. The shape of the base 2 is determined appropriately depending on the shape of the sheet 100 and the number of times it is folded, and is preferably a square or rectangular shape. The thickness direction of the base 2 is also the normal direction of the first surface 21. In this embodiment, as an example, the base 2 will be described as being square.
[0031] The base 2 has four sides, namely, a first side 121 and a second side 122 that face each other, and a third side 123 and a fourth side 124 that face each other. The first side 121 and the second side 122 face each other in a first direction D1 in the unfolded sheet 100. The first side 121 is the side on the first side portion 101 side of the unfolded sheet 100, and the second side 122 is the side on the second side portion 102 side of the unfolded sheet 100. The third side 123 and the fourth side 124 face each other in a second direction D2 in the unfolded sheet 100. The third side 123 is the side on the third side portion 103 side of the unfolded sheet 100, and the fourth side 124 is the side on the fourth side portion 104 side of the unfolded sheet 100.
[0032] The base 2 is located at the center in the first direction D1 of the unfolded sheet 100. That is, in the unfolded sheet 100, the length from the base 2 to the first side 101 is the same as the length from the base 2 to the second side 102. Furthermore, the base 2 is located at the center in the second direction D2 of the unfolded sheet 100. That is, in the unfolded sheet 100, the length from the base 2 to the third side 103 is the same as the length from the base 2 to the fourth side 104.
[0033] The folding section 3 is composed of a first folding section 31, a second folding section 32, a third folding section 33, and a fourth folding section .
[0034] FIG. 6 is a plan view showing how to fold the first folding portion and the second folding portion. FIG. 7 is a front view illustrating the state immediately before the first folding portion and the second folding portion are folded. FIG. 8 is a front view showing the state in which the first folding portion and the second folding portion are folded. As shown in FIGS. 5 to 8, the first folding portion 31 is formed by folding the sheet 100 from the base 2 to the first side 101 with alternating valley folds H1 and mountain folds H2. In other words, the unfolded sheet 100 is folded along the first side 121 of the base 2 toward the first surface 21 of the base 2, and the portion from the line along the first side 121 of the base 2 to the first side 101 is folded in an accordion-like (pleated) shape on the first surface 21 of the base 2. In the first folding portion 31, the sheet 100 is folded so that the first side 101 faces away from the second side 102. Note that, because the first folding portion 31 is folded toward the first surface 21 of the base 2, the valley fold H1 and mountain fold H2 of the first folding portion 31 refer to the valley fold and mountain fold as seen from the first surface 21 of the base 2. In FIG. 5, the valley fold H1 is indicated by a thin line, and the mountain fold H2 is indicated by a dashed line.
[0035] In the example shown in FIG. 5, four fold lines, a first fold line L11, a second fold line L12, a third fold line L13, and a fourth fold line L14, are formed from the base 2 to the first side 101. The first fold line L11 is a fold line that runs along the first side 121 of the base 2. The second fold line L12 is a fold line that is adjacent to the first fold line L11 on the side of the first side 101. The third fold line L13 is a fold line that is adjacent to the second fold line L12 on the side of the first side 101. The fourth fold line L14 is a fold line that is adjacent to the third fold line L13 on the side of the first side 101. The first fold line L11 forms a valley fold H1, the second fold line L12 forms a mountain fold H2, the third fold line L13 forms a valley fold H1, and the fourth fold line L14 forms a mountain fold H2.
[0036] The first fold line L11, the second fold line L12, the third fold line L13, and the fourth fold line L14 are fold lines extending from the third side portion 103 to the fourth side portion 104 and are substantially parallel to one another. "Substantially parallel" not only means parallel, but also includes an error of about 5% between the spacing between the first fold line L11, the second fold line L12, the third fold line L13, and the fourth fold line L14 at the third side portion 103 and the spacing between the first fold line L11, the second fold line L12, the third fold line L13, and the fourth fold line L14 at the fourth side portion 104 due to manufacturing errors, aging, etc. Furthermore, the spacing between the first fold line L11, the second fold line L12, the third fold line L13, and the fourth fold line L14 is substantially the same. That is, in the unfolded sheet 100, the spacing between the valley fold H1 and the mountain fold H2 at the first folded portion 31 is substantially the same. "Approximately the same" does not just mean the same, but also includes the same error of about 5% as above due to manufacturing errors, aging, and the like.
[0037] Here, the portion of the first folded portion 31 separated by the mountain fold H2 and the valley fold H1 is referred to as the pleated portion P1. The first folded portion 31 has a plurality of pleated portions P1, and each pleated portion P1 is formed from a single piece of sheet 100. Of the plurality of pleated portions P1, the pleat portion P1 located on the outermost layer opposite the base portion 2 is referred to as the end pleat portion P1E.
[0038] In the example shown in FIG. 5, four pleat portions P1 are provided: a first pleat portion P11, a second pleat portion P12, a third pleat portion P13, and a fourth pleat portion P14. The first pleat portion P11 is formed by a portion of the sheet 100 located between the first fold line L11 and the second fold line L12. The second pleat portion P12 is formed by a portion of the sheet 100 located between the second fold line L12 and the third fold line L13. The third pleat portion P13 is formed by a portion of the sheet 100 located between the third fold line L13 and the fourth fold line L14. The fourth pleat portion P14 is formed by a portion of the sheet 100 located between the fourth fold line L14 and the first side portion 101. The fourth pleat portion P14 is an end pleat portion P1E located in the outermost layer opposite the base portion 2.
[0039] The second folding portion 32 is formed by folding the sheet 100 such that valley folds H1 and mountain folds H2 are alternately repeated from the base 2 to the second side 102. That is, the unfolded sheet 100 is folded along the second side 122 of the base 2 toward the first surface 21 of the base 2, and the portion from the line along the second side 122 of the base 2 to the second side 102 is folded in an accordion-like (pleated) shape on the first surface 21 of the base 2. In the second folding portion 32, the sheet 100 is folded so that the second side 102 faces away from the first side 101. Note that, because the second folding portion 32 is folded toward the first surface 21 of the base 2, the valley fold H1 and mountain fold H2 of the second folding portion 32 refer to the valley folds and mountain folds as viewed from the first surface 21 of the base 2.
[0040] In the example shown in FIG. 5, four fold lines, a first fold line L21, a second fold line L22, a third fold line L23, and a fourth fold line L24, are formed from the base 2 to the second side 102. The first fold line L21 is a fold line that runs along the second side 122 of the base 2. The second fold line L22 is a fold line adjacent to the first fold line L21 on the side of the second side 102. The third fold line L23 is a fold line adjacent to the second fold line L22 on the side of the second side 102. The fourth fold line L24 is a fold line adjacent to the third fold line L23 on the side of the second side 102. The first fold line L21 forms a valley fold H1, the second fold line L22 forms a mountain fold H2, the third fold line L23 forms a valley fold H1, and the fourth fold line L24 forms a mountain fold H2.
[0041] The first fold line L21, the second fold line L22, the third fold line L23, and the fourth fold line L24 extend from the third side portion 103 to the fourth side portion 104 and are substantially parallel to one another. The first fold line L21, the second fold line L22, the third fold line L23, and the fourth fold line L24 are spaced apart at substantially the same intervals. That is, in the unfolded sheet 100, the distances between the valley fold H1 and the mountain fold H2 in the first folding portion 32 are substantially the same.
[0042] Here, the portion of the second folded portion 32 separated by the mountain fold H2 and the valley fold H1 is referred to as the pleated portion P2. The second folded portion 32 has a plurality of pleated portions P2, and each pleated portion P2 is formed from a single piece of sheet 100. Of the plurality of pleated portions P2, the pleated portion P2 located on the outermost layer opposite the base portion 2 is referred to as the end pleat portion P2E.
[0043] In the example shown in FIG. 5, four pleat portions P2 are provided: a first pleat portion P21, a second pleat portion P22, a third pleat portion P23, and a fourth pleat portion P24. The first pleat portion P21 is formed by a portion of the sheet 100 located between the first fold line L21 and the second fold line L22. The second pleat portion P22 is formed by a portion of the sheet 100 located between the second fold line L22 and the third fold line L23. The third pleat portion P23 is formed by a portion of the sheet 100 located between the third fold line L23 and the fourth fold line L24. The fourth pleat portion P24 is formed by a portion of the sheet 100 located between the fourth fold line L24 and the second side portion 102. The fourth pleat portion P24 is an end pleat portion P2E located in the outermost layer opposite the base portion 2.
[0044] The first folding portion 31 and the second folding portion 32 do not overlap each other, and a slit S1 is formed between the first folding portion 31 and the second folding portion 32. The slit S1 is a cut between the first folding portion 31 and the second folding portion 32. The first surface 21 of the base 2 is opened at the slit S1.
[0045] Furthermore, the number of valley folds H1 and mountain folds H2 in the first folded portion 31 is the same as the number of valley folds H1 and mountain folds H2 in the second folded portion 32. In other words, the number of pleat portions P1 in the first folded portion 31 is the same as the number of pleat portions P2 in the second folded portion 32.
[0046] Fig. 9 is a front view showing how to fold the third and fourth folding portions. Fig. 10 is a side view illustrating the state immediately before the third and fourth folding portions are folded. As shown in Figs. 6 to 10 and 2, the third folding portion 33 is formed by folding the first folding portion 31 and the second folding portion 32 from the base 2 to the third side 103 with alternating valley folds H1 and mountain folds H2. That is, the first folding portion 31 and the second folding portion 32 formed by folding the sheet 100 are folded along the third side 123 of the base 2 toward the first surface 21 of the base 2, and the portion from the line along the third side 123 of the base 2 to the third side 103 is folded in an accordion-like (pleated) shape on the first surface 21 of the base 2. In the third folding portion 33, the first folding portion 31 and the second folding portion 32 are folded so that the third side 103 faces away from the fourth side 104. Note that, because the third folding portion 33 is folded toward the first surface 21 of the base 2, the valley fold H1 and the mountain fold H2 of the third folding portion 33 refer to the valley fold and the mountain fold as seen from the first surface 21 of the base 2. In FIG. 6, the valley fold H1 is indicated by a thin line, and the mountain fold H2 is indicated by a dashed line.
[0047] In the example shown in FIG. 6, four fold lines, a first fold line L31, a second fold line L32, a third fold line L33, and a fourth fold line L34, are formed from the base 2 to the third side 103. The first fold line L31 is a fold line that runs along the third side 123 of the base 2. The second fold line L32 is a fold line adjacent to the first fold line L31 on the side of the third side 103. The third fold line L33 is a fold line adjacent to the second fold line L32 on the side of the third side 103. The fourth fold line L34 is a fold line adjacent to the third fold line L33 on the side of the third side 103. The first fold line L31 forms a valley fold H1, the second fold line L32 forms a mountain fold H2, the third fold line L33 forms a valley fold H1, and the fourth fold line L34 forms a mountain fold H2. In addition, since the valley fold H1 and mountain fold H2 of the third folding portion 33 are fold lines of the first folding portion 31 and the second folding portion 32, in the unfolded sheet 100, the first fold line L31, the second fold line L32, the third fold line L33, and the fourth fold line L34 are each fold lines in which the valley folds H1 and the mountain folds H2 are alternately continuous (see Figure 5).
[0048] The first fold line L31, the second fold line L32, the third fold line L33, and the fourth fold line L34 are fold lines that extend from the first side portion 101 to the second side portion 102 and are substantially parallel to one another. The first fold line L31, the second fold line L32, the third fold line L33, and the fourth fold line L34 are spaced apart at substantially the same intervals. That is, in the unfolded sheet 100, the distances between the valley fold H1 and the mountain fold H2 in the third folded portion 33 are substantially the same.
[0049] Here, the portion of the third folded portion 33 separated by the mountain fold H2 and the valley fold H1 is referred to as the pleated portion P3. The third folded portion 33 has a plurality of pleated portions P3, and each pleated portion P3 is made up of a plurality of first folded portions 31 and second folded portions 32. Of the plurality of pleated portions P3, the pleated portion P3 located in the outermost layer on the side opposite the base portion 2 is referred to as the end pleat portion P3E.
[0050] In the example shown in FIG. 6, four pleat portions P3 are provided: a first pleat portion P31, a second pleat portion P32, a third pleat portion P33, and a fourth pleat portion P34. The first pleat portion P31 is formed by the portions of the first folded portion 31 and the second folded portion 32 located between the first fold line L31 and the second fold line L32. The second pleat portion P32 is formed by the portions of the first folded portion 31 and the second folded portion 32 located between the second fold line L32 and the third fold line L33. The third pleat portion P33 is formed by the portions of the first folded portion 31 and the second folded portion 32 located between the third fold line L33 and the fourth fold line L34. The fourth pleat portion P34 is formed by the portions of the first folded portion 31 and the second folded portion 32 located between the fourth fold line L34 and the third side portion 103. The fourth pleat portion P34 becomes an end pleat portion P3E located in the outermost layer on the side opposite to the base portion 2.
[0051] The fourth folding portion 34 is formed by folding the first folding portion 31 and the second folding portion 32 from the base 2 to the fourth side 104 with alternate valley folds H1 and mountain folds H2. In other words, the first folding portion 31 and the second folding portion 32 formed by folding the sheet 100 are folded toward the first surface 21 of the base 2 along the fourth side 124 of the base 2, and the portion from a line along the fourth side 124 of the base 2 to the fourth side 104 is folded in an accordion-like (pleated) shape on the first surface 21 of the base 2. In the fourth folding portion 34, the first folding portion 31 and the second folding portion 32 are folded so that the fourth side 104 faces away from the third side 103. In addition, since the fourth folding portion 34 is folded toward the first surface 21 of the base 2, the valley fold H1 and mountain fold H2 of the fourth folding portion 34 refer to the valley fold and mountain fold when viewed from the first surface 21 side of the base 2.
[0052] In the example shown in FIG. 6, four fold lines, a first fold line L41, a second fold line L42, a third fold line L43, and a fourth fold line L44, are formed from the base portion 2 to the fourth side 104. The first fold line L41 is a fold line that runs along the fourth side 124 of the base portion 2. The second fold line L42 is a fold line adjacent to the first fold line L31 on the side of the fourth side 104. The third fold line L43 is a fold line adjacent to the second fold line L42 on the side of the fourth side 104. The fourth fold line L44 is a fold line adjacent to the third fold line L43 on the side of the fourth side 104. The first fold line L41 forms a valley fold H1, the second fold line L42 forms a mountain fold H2, the third fold line L43 forms a valley fold H1, and the fourth fold line L44 forms a mountain fold H2. In addition, since the valley fold H1 and mountain fold H2 of the fourth folding portion 34 are fold lines of the first folding portion 31 and the second folding portion 32, in the unfolded sheet 100, the first fold line L41, the second fold line L42, the third fold line L43, and the fourth fold line L44 are each fold lines in which the valley folds H1 and the mountain folds H2 are alternately continuous (see Figure 5).
[0053] The first fold line L41, the second fold line L42, the third fold line L43, and the fourth fold line L44 are fold lines that extend from the first side portion 101 to the second side portion 102 and are substantially parallel to one another. The first fold line L41, the second fold line L42, the third fold line L43, and the fourth fold line L44 are spaced apart at substantially the same intervals. That is, in the unfolded sheet 100, the distances between the valley fold H1 and the mountain fold H2 in the fourth folded portion 34 are substantially the same.
[0054] Here, the portion of the fourth folded portion 34 separated by the mountain fold H2 and the valley fold H1 is referred to as the pleat portion P4. The fourth folded portion 34 has a plurality of pleat portions P4, and each pleat portion P4 is made up of a plurality of first folded portions 31 and second folded portions 32. Of the plurality of pleat portions P4, the pleat portion P4 located in the outermost layer on the side opposite the base portion 2 is referred to as the end pleat portion P4E.
[0055] In the example shown in FIG. 6, four pleat portions P4 are provided: a first pleat portion P41, a second pleat portion P42, a third pleat portion P43, and a fourth pleat portion P44. The first pleat portion P41 is formed by the portions of the first folded portion 31 and the second folded portion 32 located between the first fold line L41 and the second fold line L42. The second pleat portion P42 is formed by the portions of the first folded portion 31 and the second folded portion 32 located between the second fold line L42 and the third fold line L43. The third pleat portion P43 is formed by the portions of the first folded portion 31 and the second folded portion 32 located between the third fold line L43 and the fourth fold line L44. The fourth pleat portion P44 is formed by the portions of the first folded portion 31 and the second folded portion 32 located between the fourth fold line L44 and the fourth side portion 104. The fourth pleat portion P44 becomes an end pleat portion P4E located in the outermost layer on the side opposite to the base portion 2.
[0056] The third folding portion 33 and the fourth folding portion 34 do not overlap each other, and a slit S2 is formed between the third folding portion 33 and the fourth folding portion 34. The slit S2 is a cut between the third folding portion 33 and the fourth folding portion 34. When viewed from the first surface 21 side of the base 2, the slits S1 and S2 form a cross-shaped slit, and the first surface 21 of the base 2 is opened at the portion where the slits S1 and S2 intersect.
[0057] Furthermore, the number of valley folds H1 and mountain folds H2 in the third folded portion 33 is the same as the number of valley folds H1 and mountain folds H2 in the fourth folded portion 34. In other words, the number of pleat portions P3 in the third folded portion 33 is the same as the number of pleat portions P4 in the fourth folded portion 34.
[0058] The folding portion 3 is located at approximately the same position as the base 2 when viewed from the thickness direction of the base 2. "Approximately the same position" means not only the same position but also a position that is shifted due to manufacturing errors, aging, etc. Furthermore, the folding portion 3 has approximately the same shape as the base 2 when viewed from the thickness direction of the base 2. "Approximately the same shape" means not only the same shape but also a shape that has been deformed due to manufacturing errors, aging, etc. The shape of the folding portion 3 when viewed from the thickness direction of the base 2 is a combined shape of the first folding portion 31, the second folding portion 32, the third folding portion 33, and the fourth folding portion 34. In this embodiment, the shape of the base 2 when viewed from the thickness direction of the base 2 is square, and therefore the shape of the folding portion 3 when viewed from the thickness direction of the base 2 is also square.
[0059] The fixing portions 131 provided at the first corner 105 and the second corner 106 of the sheet 100 are disposed at the end pleat P3E of the third folded portion 33. The fixing portions 131 provided at the third corner 107 and the fourth corner 108 of the sheet 100 are disposed at the end pleat P4E of the fourth folded portion 34.
[0060] The length of each side of the base 2 is, for example, 1 / 100 to 1 / 3, preferably 1 / 25 to 1 / 5, and more preferably 1 / 11 to 1 / 7 of the length in the extension direction of the corresponding side of the base 2 of the unfolded sheet 100 (first side portion 101 for the first side 121, second side portion 102 for the second side 122, third side portion 103 for the third side 123, and fourth side portion 104 for the fourth side 124).
[0061] To facilitate easy transportation and storage of the foldable sheet 1, the first side 121, second side 122, third side 123, and fourth side 124 are preferably 10 cm to 2 m, more preferably 20 cm to 1 m, and even more preferably 30 cm to 80 cm. To achieve the above preferred ranges, the number of fold lines (fold lines) in the first direction D1 and the number of fold lines (fold lines) in the second direction D2 can be selected appropriately depending on the shape and size of the sheet 100 and the shape and size of the desired foldable sheet 1.
[0062] The sheet 100 may have markings (not shown) to indicate the folding portions at at least some of the folding positions that form the valley fold H1 and mountain fold H2 of each of the first folding portion 31, the second folding portion 32, the third folding portion 33, and the fourth folding portion 34. The folding positions that form the valley fold H1 and the mountain fold H2 are the positions that form each fold line, and in the example of FIG. 5, these are the positions that form the first fold line L11, the second fold line L12, the third fold line L13, and the fourth fold line L14 of the first folding portion 31; the first fold line L21, the second fold line L22, the third fold line L23, and the fourth fold line L24 of the second folding portion 32; the first fold line L31, the second fold line L32, the third fold line L33, and the fourth fold line L34 of the third folding portion 33; and the first fold line L41, the second fold line L42, the third fold line L43, and the fourth fold line L44 of the fourth folding portion 34. Markings can be provided on sheet 100 by, for example, printing on the surface of sheet 100, laminating a printed layer within sheet 100, laminating a component such as a string within sheet 100, or marking a portion of the laminate that does not contain resin fibers.
[0063] (package) Fig. 11 is a side view of a package in which a folding sheet is wrapped in a wrapping material. As shown in Fig. 11, package 200 according to this embodiment includes the folding sheet 1 described above and wrapping material 201 that wraps the folding sheet 1. In other words, package 200 is formed by wrapping the folding sheet 1 described above in wrapping material 201. As wrapping material 201, for example, a storage bag that contains folding sheet 1 is used. Furthermore, folding sheet 1 may be further folded along slit S1 in Fig. 8 and wrapped in wrapping material 201.
[0064] (How to fold the seat) Next, a method for folding a sheet according to this embodiment will be described. The method for folding a sheet according to this embodiment is a method for manufacturing the foldable sheet 1 described above.
[0065] First, the above-described sheet 100 is prepared. Then, as shown in FIGS. 5 to 8 , the sheet 100 is folded from a rectangular base 2 not including the periphery of the sheet 100 to the first side 101 by alternately repeating valley folds H1 and mountain folds H2 so that the first side 101 faces the opposite side from the second side 102. This forms a first folded portion 31 in which the sheet 100 is folded from the base 2 to the first side 101 by alternately repeating valley folds H1 and mountain folds H2 so that the first side 101 faces the opposite side from the second side 102. Furthermore, the sheet 100 is folded from the base 2 to the second side 102 by alternately repeating valley folds H1 and mountain folds H2 so that the second side 102 faces the opposite side from the first side 101. This forms a second folded portion 32 in which the sheet 100 is folded from the base 2 to the second side 102 by alternating valley folds H1 and mountain folds H2 so that the second side 102 faces the opposite side to the first side 101.
[0066] Once the first folding portion 31 and the second folding portion 32 are formed, the first folding portion 31 and the second folding portion 32 are folded from the base portion 2 to the third side 103 by alternately forming valley folds H1 and mountain folds H2. At this time, the first folding portion 31 and the second folding portion 32 are folded so that the third side 103 faces away from the fourth side 104. As a result, the first folding portion 31 and the second folding portion 32 are folded from the base portion 2 to the third side 103 by alternately forming valley folds H1 and mountain folds H2 so that the third side 103 faces away from the fourth side 104, forming the third folding portion 33. Furthermore, the first folding portion 31 and the second folding portion 32 are folded from the base portion 2 to the fourth side 104 by alternately forming valley folds H1 and mountain folds H2. At this time, the first folding portion 31 and the second folding portion 32 are folded so that the fourth side portion 104 faces the opposite side from the third side portion 103. As a result, the first folding portion 31 and the second folding portion 32 are folded from the base portion 2 to the fourth side portion 104 by alternately repeating valley folds H1 and mountain folds H2 so that the fourth side portion 104 faces the opposite side from the third side portion 103, forming a fourth folding portion 34.
[0067] As described above, in the folding sheet 1 according to this embodiment, the folding section 3 having the first folding section 31, the second folding section 32, the third folding section 33, and the fourth folding section 34 is folded toward the first surface 21 of the base 2 with respect to the base 2. In the first folding section 31, the sheet 100 is folded in an accordion-like (pleated) shape from the base 2 to the first side 101 so that the first side 101 faces away from the second side 102, and in the second folding section 32, the sheet 100 is folded in an accordion-like shape from the base 2 to the second side 102 so that the second side 102 faces away from the first side 101. In addition, in the third folding section 33, the first folding section 31 and the second folding section 32 are folded accordion-like from the base 2 to the third side 103, and in the fourth folding section 34, the first folding section 31 and the second folding section 32 are folded accordion-like from the base 2 to the fourth side 104. As a result, the four corners of the sheet 100 are located in the end pleats P3E and P4E, which are located in the outermost layers of the third folding section 33 and the fourth folding section 34, opposite the base 2. This makes it easy and quick to find the four corners of the sheet 100. Furthermore, because the sheet 100 is folded accordion-like from the base 2 toward the four sides of the sheet 100, the sheet 100 can be easily and quickly unfolded by pulling the four corners without requiring a large force.
[0068] Furthermore, in this folding sheet 1, the third folding portion 33 is folded so that the third side 103 faces away from the fourth side 104, and the fourth folding portion 34 is folded so that the fourth side 104 faces away from the third side 103, so that the four corners of the sheet 100 are located on the surface of the folding sheet 1 opposite the base 2. This makes it easier and faster to find the four corners of the sheet 100.
[0069] Furthermore, in this folding sheet 1, the base 2 is located in the center of the direction in which the first side 101 and the second side 102 of the unfolded sheet 100 face each other, so the first folding portion 31 and the second folding portion 32 can be easily folded, and the first folding portion 31 and the second folding portion 32 can be folded in the same way. Furthermore, the base 2 is located in the center of the direction in which the third side 103 and the fourth side 104 of the unfolded sheet 100 face each other, so the third folding portion 33 and the fourth folding portion 34 can be easily folded, and the third folding portion 33 and the fourth folding portion 34 can be folded in the same way.
[0070] Furthermore, in this folding sheet 1, the distance between the valley fold H1 and the mountain fold H2 of the unfolded sheet 100 is approximately the same in each of the first folding portion 31, the second folding portion 32, the third folding portion 33, and the fourth folding portion 34, so that partial protrusion of the sheet 100 can be prevented in each of the first folding portion 31, the second folding portion 32, the third folding portion 33, and the fourth folding portion 34.
[0071] Furthermore, in this folding sheet 1, the folding portion 3 is located at approximately the same position as the base portion 2 when viewed in the thickness direction of the base portion 2, so multiple folding sheets 1 can be laid out closely together with no gaps between them, thereby improving the storage properties of the folding sheet 1.
[0072] Furthermore, in this folding sheet 1, the length of each side of the base 2 is 1 / 100 to 1 / 3, preferably 1 / 25 to 1 / 5, and more preferably 1 / 11 to 1 / 7 of the length of the corresponding side of the base 2 in the extension direction of the unfolded sheet 100. This prevents the number of folds in the folding section 3 from increasing and the folding sheet 1 from becoming too bulky, and also makes it possible to make the folding sheet 1 more compact.
[0073] In addition, in this folding sheet 1, the fixing portions 131 provided at the four corners of the sheet 100 are arranged at the end pleat portions P3E and P4E of the third folding portion 33 and the fourth folding portion 34, so that the four corners of the sheet 100 can be found more easily and quickly.
[0074] In the package 200 according to this embodiment, the folding sheet 1 is wrapped in the wrapping material 201, so that after the folding sheet 1 is removed from the wrapping material 201, the folding sheet 1 can be quickly unfolded.
[0075] Furthermore, since this sheet 100 has markings M at at least some of the folding positions that form the valley fold H1 and mountain fold H2, the sheet 100 can be easily folded when creating the folding sheet 1 or when refolding the unfolded sheet 100.
[0076] In the folding method of sheet 100 according to this embodiment, sheet 100 is folded from base 2 to first side 101 by alternately repeating valley folds H1 and mountain folds H2 so that first side 101 faces the opposite side from second side 102; sheet 100 is folded from base 2 to second side 102 by alternately repeating valley folds H1 and mountain folds H2 so that second side 102 faces the opposite side from first side 101; first folding portion 31 and second folding portion 32 are folded from base 2 to third side 103 by alternately repeating valley folds H1 and mountain folds H2; and first folding portion 31 and second folding portion 32 are folded from base 2 to fourth side 104 by alternately repeating valley folds H1 and mountain folds H2. This makes it possible to produce the above-described foldable sheet 1, which can be quickly unfolded.
[0077] Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.
[0078] For example, in the above embodiment, the third folding portion is described as being folded so that the third side faces away from the fourth side, and the fourth folding portion is described as being folded so that the fourth side faces away from the third side. However, the third folding portion may be folded so that the third side faces toward the fourth side. The fourth folding portion may be folded so that the fourth side faces toward the third side. Furthermore, the third folding portion and the fourth folding portion may be configured to have one less mountain fold and the eyelets may be positioned inside the third folding portion and the fourth folding portion.
[0079] Fig. 12 is a plan view of a folding sheet of a modified example. Fig. 13 is a side view of the folding sheet shown in Fig. 12. Fig. 14 is a plan view of the folding sheet shown in Fig. 12 when unfolded. The folding sheet 1A shown in Figs. 12 to 14 is basically the same as the folding sheet 1 of the above embodiment, except that the unfolded sheet 100A has a shorter length in the second direction D2 than the sheet 100 of the above embodiment. The folding sheet 1A has a base 2 and a folding portion 3A, and the folding portion 3A has a first folding portion 31A, a second folding portion 32A, a third folding portion 33A, and a fourth folding portion 34A.
[0080] The first folding portion 31A is formed by folding the sheet 100A from the base 2 to the first side 101 with alternate valley folds H1 and mountain folds H2. In the first folding portion 31A, the sheet 100A is folded so that the first side 101 faces away from the second side 102. The second folding portion 32A is formed by folding the sheet 100A from the base 2 to the second side 102 with alternate valley folds H1 and mountain folds H2. In the second folding portion 32A, the sheet 100A is folded so that the second side 102 faces away from the first side 101.
[0081] The third folding portion 33A is configured by folding the first folding portion 31A and the second folding portion 32A alternately from the base portion 2 to the third side 103 with valley folds H1 and mountain folds H2. In the third folding portion 33A, the first folding portion 31A and the second folding portion 32A are folded so that the third side 103 faces the fourth side 104. The fourth folding portion 34A is configured by folding the first folding portion 31A and the second folding portion 32A alternately from the base portion 2 to the fourth side 104 with valley folds H1 and mountain folds H2. In the fourth folding portion 34A, the first folding portion 31A and the second folding portion 32A are folded so that the fourth side 104 faces the third side 103.
[0082] In the method for folding sheet 100A to produce foldable sheet 1A, first folding portion 31A and second folding portion 32A are formed in the same manner as in the above embodiment. After first folding portion 31A and second folding portion 32A are formed, first folding portion 31A and second folding portion 32A are folded by alternately repeating valley folds H1 and mountain folds H2 from base portion 2 to third side 103 so that third side 103 faces fourth side 104. Furthermore, first folding portion 31A and second folding portion 32 are folded by alternately repeating valley folds H1 and mountain folds H2 from base portion 2 to fourth side 104 so that fourth side 104 faces third side 103. In this manner, foldable sheet 1A is produced.
[0083] In this folded sheet 1A, the four corners of the sheet 100A are not positioned on the surface of the folded sheet 1A opposite the base 2. However, the four corners of the sheet 100A are positioned in the end pleats P3E and P4E, which are located on the outermost layers of the third folded portion 33A and the fourth folded portion 34A opposite the base 2, respectively. Therefore, as shown in FIGS. 15 and 16, by unfolding the end pleats P35 of the third folded portion 33A and the end pleats P45 of the fourth folded portion 34A, the four corners of the sheet 100A are positioned on the surface of the folded sheet 1A opposite the base 2. FIG. 15 is a plan view showing the unfolded end pleats of the folded sheet shown in FIG. 12. FIG. 16 is a side view showing the unfolded end pleats of the folded sheet shown in FIG. 12. Therefore, the four corners of the sheet 100A can be easily and quickly found, and the sheet 100A can be easily and quickly unfolded by pulling the four corners.
[0084] In addition, in the above embodiment, it has been described that grommets are provided as fixing portions at the four corners of the sheet, but grommets may also be provided at the first side, second side, third side, and fourth side.
[0085] Furthermore, in the above embodiment, the unfolded sheet is described as being formed in an approximately rectangular shape with sharp corners, but the unfolded sheet may also be formed in an approximately rectangular shape with rounded (chamfered) corners.
[0086] In the above embodiment, the base is described as being square, but the base may be formed in a rectangular shape. In this case, the base may be a rectangular shape that is long in a first direction of the unfolded sheet, or a rectangular shape that is long in a second direction of the unfolded sheet.
[0087] In addition, in the above embodiment, the first folding portion and the second folding portion are described as not overlapping each other and a slit is formed between the first folding portion and the second folding portion, but the first folding portion and the second folding portion may overlap each other or may be spaced apart to form a gap (play) between the first folding portion and the second folding portion. Similarly, in the above embodiment, the third folding portion and the fourth folding portion are described as not overlapping each other and a slit is formed between the third folding portion and the fourth folding portion, but the third folding portion and the fourth folding portion may overlap each other or may be spaced apart to form a gap (play) between the third folding portion and the fourth folding portion. [Explanation of symbols]
[0088] 1...folding sheet, 1A...folding sheet, 2...base, 3...folding portion, 3A...folding portion, 21...first surface, 31...first folding portion, 31A...first folding portion, 32...second folding portion, 32A...second folding portion, 33...third folding portion, 33A...third folding portion, 34...fourth folding portion, 34A...fourth folding portion, 100...sheet, 100A...sheet, 101...first side portion, 102...second side portion, 103...third side portion, 104...fourth side portion, 105...first corner, 106...second corner, 107...third corner, 108...fourth corner, 121...first side, 122...second side, 123...third side, 124...fourth side, 131...fixing part, 200...package, 201...packaging material, D1 ...First direction, D2...Second direction, H1...Valley fold, H2...Mountain fold, L11...First fold line, L12...Second fold line, L13...Third fold line, L14...Fourth fold line, L21...First fold line, L22...Second fold line, L23...Third fold line, L 24...fourth fold line, L31...first fold line, L32...second fold line, L33...third fold line, L34...fourth fold line, L41...first fold line, L42...second fold line, L43...third fold line, L44...fourth fold line, P1...pleat portion, P2...pleat portion, P3...pleat portion, P4...pleat portion, P11...first pleat portion, P12...second pleat portion, P13...third pleat portion, P14...fourth pleat portion, P1E...end pleat portion, P21...first pleat P21...first pleat portion, P22...second pleat portion, P23...third pleat portion, P24...fourth pleat portion, P2E...end pleat portion, P31...first pleat portion, P32...second pleat portion, P33...third pleat portion, P34...fourth pleat portion, P3E...end pleat portion, P41...first pleat portion, P42...second pleat portion, P43...third pleat portion, P44...fourth pleat portion, P4E...end pleat portion, S1...slit, S2...slit.
Claims
1. A folding seat in which the seat is folded, The folding sheet is a rectangular base portion that does not include the outer periphery of the sheet; a folding portion folded toward the first surface of the base portion relative to the base portion, The folding portion is a first folded portion in which the sheet is folded by alternately repeating valley folds and mountain folds from the base portion to the first side portion so that a first side portion of the sheet is directed to an opposite side to a second side portion of the sheet facing the first side portion; a second folded portion in which the sheet is folded by alternately repeating valley folds and mountain folds from the base portion to the second side portion so that the second side portion faces the opposite side to the first side portion; a third folded portion in which the first folded portion and the second folded portion are folded from the base portion to a third side portion of the sheet perpendicular to the first side portion and the second side portion by alternately repeating valley folds and mountain folds; a fourth folding portion formed by folding the first folding portion and the second folding portion from the base portion to a fourth side portion of the sheet opposite the third side portion by alternately repeating valley folds and mountain folds, Folding seat.
2. the third folding portion is folded so that the third side portion faces the opposite side to the fourth side portion, The fourth folding portion is folded so that the fourth side portion faces the opposite side to the third side portion.
2. The folding sheet according to claim 1.
3. the base is located at a center of the unfolded sheet in a direction in which the first side and the second side face each other, and at a center of the unfolded sheet in a direction in which the third side and the fourth side face each other.
2. The folding sheet according to claim 1.
4. the distances between the valley folds and the mountain folds of the unfolded sheet are substantially the same at the first folding portion, the second folding portion, the third folding portion, and the fourth folding portion; 2. The folding sheet according to claim 1.
5. The folding portion is located at approximately the same position as the base portion when viewed in the thickness direction of the base portion.
2. The folding sheet according to claim 1.
6. The base is rectangular, The length of the short side of the base is 1 / 100 to 1 / 3 of the length of the unfolded sheet in the short side direction of the base.
2. The folding sheet according to claim 1.
7. The seat further includes fixing portions provided at four corners of the seat for fixing the seat, When the portions of the third folding portion and the fourth folding portion partitioned by the mountain folds and the valley folds are defined as pleat portions, the fixing portion is disposed in the pleat portion located in the outermost layer of the first folding portion and the fourth folding portion opposite to the base portion.
2. The folding sheet according to claim 1.
8. The sheet is not breathable.
2. The folding sheet according to claim 1.
9. The sheet is breathable.
2. The folding sheet according to claim 1.
10. A folding sheet according to any one of claims 1 to 9; and a packaging material for packaging the folded sheet. package.
11. A sheet used in the folding sheet according to any one of claims 1 to 9, markings provided at least at some of the folding positions that become the valley folds and the mountain folds; Sheet.
12. A method for folding a seat, comprising: Folding the sheet by alternately repeating valley folds and mountain folds from a rectangular base portion not including the outer periphery of the sheet to the first side portion so that the first side portion of the sheet is directed to the side opposite to a second side portion of the sheet that faces the first side portion, Folding the sheet from the base portion to the second side portion by alternately repeating valley folds and mountain folds so that the second side portion faces the opposite side to the first side portion; a first folded portion folded from the base portion to the first side portion and a second folded portion folded from the base portion to the second side portion are folded alternately in valley folds and mountain folds from the base portion to a third side portion of the sheet perpendicular to the first side portion and the second side portion; The first folding portion and the second folding portion are folded by alternately repeating valley folds and mountain folds from the base portion to a fourth side portion of the sheet opposite the third side portion. How to fold the seat.
Citation Information
Patent Citations
Folding method for construction sheet and construction sheet
JP2020101061A
Eyelet and sheet body and belt using same
JP3229040U