bag body

Abstract

To provide a bag body that is simple, low in cost, and friendly to the earth.SOLUTION: The present invention is a flat bag body 101F in which a pocket is formed by folding one piece of paper sheet 101B. The one piece of paper sheet 101B includes at least: an approximately rectangular first sheet 1 in which a first fixing piece 11 is connected with either of top and bottom edges L2; an approximately rectangular second sheet 2 connected with either of left and right edges L1 of the first sheet 1; and an approximately rectangular third sheet 3 connected with either of top and bottom edges L3 of the second sheet 2. Each sheet is folded at each connection portion such that the first sheet 1 and the second sheet 2 pinch the other sheet 3. The first fixing piece 11 connected with the first sheet 1 is folded on the second sheet 2 and fixed, forming a file shape having at least two pockets.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a flat pouch capable of storing documents and the like. [Background technology]

[0002] BACKGROUND ART Conventionally, examples of pouches that can be used to carry documents and the like include files and envelopes, and various pouches with improved structures to make them easier for users are known.

[0003] For example, Patent Document 1 describes a clear file with three pockets formed by folding a single resin sheet and heat-sealing the bottom edge, and Patent Document 2 describes a clear file with tearable micro-perforations on the top and left edges so that when a single synthetic resin sheet is folded in half with the folded edge at the right edge, the left and bottom edges are heat-sealed in a strip shape, and the top edge is sealed to change from an envelope state to a clear file state. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3233573 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-132326 Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, the problem of plastic waste has become more serious worldwide, and there is a desire to switch from plastic to other materials in order to improve the global environment. Furthermore, forming pockets in resin sheets requires separate heat welding equipment and processes, which is expected to increase the manufacturing effort and costs.

[0006] An object of the present invention is to provide a bag that is simple, low-cost, and environmentally friendly. [Means for solving the problem]

[0007] A first form of bag according to the present invention is a flat bag in which a pocket is formed by folding a single paper sheet, the single paper sheet comprising at least a first, approximately rectangular sheet having a first fixing piece connected to either the top or bottom edge thereof, a second, approximately rectangular sheet connected to either the left or right edge of the first sheet, and a third, approximately rectangular sheet connected to either the top or bottom edge of the second sheet, and the first and second sheets are folded at their respective connecting portions so as to sandwich the other sheet between them, and the first fixing piece connected to the first sheet is folded over and fixed to the second sheet, thereby forming a file shape with at least two pockets.

[0008] A second form of the bag body according to the present invention is a bag body described as the first form, characterized in that the single paper sheet further includes a substantially rectangular fourth sheet connected to either the left or right edge of the third sheet, and the fourth sheet has a first cut line formed thereon to correspond to the outer contour of the first fixing piece connected to the first sheet.

[0009] A third form of the bag body according to the present invention is the bag body described as the second form, characterized in that the single paper sheet further includes a fifth sheet of approximately rectangular shape connected to either the left or right edge of the fourth sheet.

[0010] A fourth form of the bag body according to the present invention is a bag body described as any of the first to third forms, characterized in that second and third fixed pieces are further connected to the other of the upper and lower edges and the other of the left and right edges of the first sheet, and the first fixed piece, the second fixed piece, and the third fixed piece connected to the first sheet are each folded over and fixed to the second sheet, thereby forming an envelope shape with at least two pockets inside.

[0011] A fifth aspect of the bag according to the present invention is the bag described in the fourth aspect, characterized in that the second fixing piece is provided with a zipper portion for opening the envelope.

[0012] A sixth form of the bag body according to the present invention is a bag body described as the fourth form, characterized in that a first perforation is formed between the first sheet and the second fixed piece so that the second fixed piece can be separated from the first sheet, and a second perforation is formed between the first sheet and the third fixed piece so that the third fixed piece can be separated from the first sheet.

[0013] A seventh form of the bag body according to the present invention is a bag body described as the fourth form, characterized in that instead of folding and fixing the third fixed piece connected to the first sheet onto the second sheet, the third fixed piece connected to the second sheet is folded and fixed onto the first sheet, thereby forming an envelope shape with at least two pockets inside.

[0014] An eighth form of the bag body according to the present invention is a bag body described as the first or second form, characterized in that a second cut line is formed on the edge between the second sheet and the third sheet so that the first fixing piece can be inserted and fixed.

[0015] A ninth aspect of the bag according to the present invention is the bag according to the first or second aspect, characterized in that an index tab is connected to the edge of each sheet.

[0016] A tenth aspect of the bag body according to the present invention is a bag body according to the first or second aspect, characterized in that a window portion is formed in the upper part of each sheet so that the contents inside the pocket can be visually confirmed.

[0017] An eleventh form of the bag body according to the present invention is a blank for the bag body described as the first or second form, characterized in that it comprises at least a rectangular first sheet having a first fold line and a second fold line extending in a direction perpendicular to the first fold line, a rectangular second sheet connected to the first sheet via the first fold line and having a third fold line extending in a direction perpendicular to the first fold line, a rectangular third sheet connected to the second sheet via the third fold line, and a first fixing piece connected to the first sheet via the second fold line. [Effects of the Invention]

[0018] According to the present invention, a file having two or more pockets can be produced simply and at low cost by simply folding one sheet and fixing it with a fixing piece, and furthermore, since the one sheet is made of paper, it is possible to provide a bag body that is considerate of the global environment. [Brief explanation of the drawings]

[0019] [Figure 1] 1A and 1B are plan views of a bag having three pockets according to a first embodiment of the present invention, in which (a) is a front view of the bag, and (b) is a plan view of a blank in which the bag is unfolded. [Figure 2] 5A and 5B are plan views of a bag body having three pockets according to a modified example of the first embodiment of the present invention, in which (a) is a front view of the bag body, and (b) is a plan view of a blank in which the bag body is unfolded. [Figure 3] 10A and 10B are plan views of a bag having two pockets according to a second embodiment of the present invention, where (a) is a rear view of the bag before opening, (b) is a rear view of the bag after opening, and (c) is a plan view of the blank when the bag is unfolded. [Figure 4] 10A and 10B are plan views of a bag body having three pockets according to a first variant of the second embodiment of the present invention, where (a) is a rear view of the bag body before opening, (b) is a rear view of the bag body after opening, and (c) is a plan view of the blank when the bag body is unfolded. [Figure 5]10A and 10B are plan views of a bag body having four pockets according to a second variant of the second embodiment of the present invention, where (a) is a rear view of the bag body before opening, (b) is a rear view of the bag body after opening, and (c) is a plan view of the blank when the bag body is unfolded. [Figure 6] 10A and 10B are plan views of a bag body having five pockets according to a third variant of the second embodiment of the present invention, in which (a) is a rear view of the bag body before opening, (b) is a rear view of the bag body after opening, and (c) is a plan view of the blank when the bag body is unfolded. [Figure 7] 10A and 10B are plan views of a bag body having three pockets according to a third embodiment of the present invention, in which (a) is a rear view of the bag body before opening, (b) is a rear view of the bag body after opening and removing the second and third fixing pieces, and (c) is a plan view of the blank when the bag body is unfolded. [Figure 8] 10A and 10B are plan views of a bag body having four pockets according to a first variant of the third embodiment of the present invention, where (a) is a rear view of the bag body before opening, (b) is a rear view of the bag body after opening and removing the second and third fixing pieces, and (c) is a plan view of the blank when the bag body is unfolded. [Figure 9] 10A and 10B are plan views of a bag body having five pockets according to a second variant of the third embodiment of the present invention, where (a) is a rear view of the bag body before opening, (b) is a rear view of the bag body after opening and removing the second and third fixing pieces, and (c) is a plan view of the blank when the bag body is unfolded. [Figure 10] 10A and 10B are plan views of a bag body having three pockets according to a fourth embodiment of the present invention, in which (a) is a rear view of the bag body before opening, (b) is a rear view of the bag body after opening and removing the second and third fixing pieces, and (c) is a plan view of the blank when the bag body is unfolded. [Figure 11] 10A and 10B are plan views of a bag body having three pockets according to a fifth embodiment of the present invention, in which (a) is a back view of the bag body before opening, (b) is a front view of the bag body after opening, removing the second fixing piece, and breaking the third perforation P3, and (c) is a plan view of the unfolded blank of the bag body. [Figure 12]10A and 10B are plan views of a bag body having three pockets according to a sixth embodiment of the present invention, in which (a) is a front view of the bag body before opening, (b) is a back view of the bag body before opening, and (c) is a plan view of the blank when the bag body is unfolded. [Figure 13] 10A and 10B are plan views of a bag body having three pockets according to a seventh embodiment of the present invention, where (a) is a front view of the bag body, (b) is a back view of the bag body, and (c) is a plan view of a blank when the bag body is unfolded. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 13. However, the present invention is not limited to this embodiment. In this specification and claims, the term "substantially rectangular" includes not only rectangular, oblong, and approximately rectangular shapes, but also square and approximately square shapes. In this specification and claims, the term "bag" refers to a file and an envelope. In addition to a file having the shape of a so-called clear file, the term "file" refers to a file simply having a pocket and an opening and having a structure for storing documents and the like. In this specification, claims, and drawings, the term "bag blank" refers to the blank before it is torn by the perforations or zipper.

[0021] First Embodiment FIG. 1 is a plan view of a bag having three pockets according to a first embodiment of the present invention, where FIG. 1(a) is a front view of the bag, and FIG. 1(b) is a plan view of a blank in which the bag is unfolded.

[0022] The bag 101F according to this embodiment is flat and has a pocket formed by folding a single paper sheet 101B, and has a file shape. Documents and the like can be stored in the pocket. The paper sheet 101B is made of cardboard. In the present invention, the items stored in the bag are not limited to documents, and various items can be used as long as they are thin and have a size that allows them to be stored.

[0023] As shown in Figures 1(a) and 1(b), the single paper sheet 101B constituting the bag body 101F of the present invention comprises at least a first sheet 1 of approximately rectangular shape with a first fixed piece 11 connected to either its upper or lower edge L2, a second sheet 2 of approximately rectangular shape connected to either its left or right edge L1 of the first sheet 1, and a third sheet 3 of approximately rectangular shape connected to either its upper or lower edge L3 of the second sheet 2.The first sheet 1 and the second sheet 2 are folded at each connecting portion so as to sandwich the other sheet, and the first fixed piece 11 connected to the first sheet 1 is folded over and fixed to the second sheet 2, thereby forming a file shape with at least two pockets.

[0024] More specifically, as shown in FIGS. 1(a) and 1(b), the single paper sheet 101B constituting the bag 101F according to this embodiment further includes a substantially rectangular fourth sheet 4 connected to either the left or right edge L4 of the third sheet 3, and a first cut line CL1 is provided on the fourth sheet 4 to correspond to the outer contour of the first fixing piece 11 connected to the first sheet 1. In this embodiment, the first cut line CL1 is wide and inverted U-shaped, and there is no cut along the second folding line L2. Note that, in the present invention, a cut may be formed along the second folding line L2, as in the modified examples and embodiments described below. In addition, in the present invention, there may be a fifth sheet connected to the substantially rectangular fourth sheet 4, or a sheet connected to the fifth sheet.

[0025] Furthermore, in the bag 101F according to this embodiment, as shown in Figures 1(a) and 1(b), index tabs 2T, 3T, and 4T are connected to the edges of the sheets 2, 3, and 4, respectively. The index tabs are spaced apart so that the information written on each tab can be seen at a glance when the bag is in a file state.

[0026] In this embodiment, as shown in Figures 1(a) and 1(b), the blank 101B of the bag body 101F comprises a rectangular first sheet 1 having a first folding line L1 and a second folding line L2 extending in a direction perpendicular to the first folding line L1, a rectangular second sheet 2 connected to the first sheet 1 via the first folding line L1 and having a third folding line L3 extending in a direction perpendicular to the first folding line L1, a rectangular third sheet 3 connected to the second sheet 2 via the third folding line L3 and having a fourth folding line L4 extending in a direction perpendicular to the third folding line L3, a rectangular fourth sheet 4 connected to the third sheet 3 via the fourth folding line L4, and a first fixed piece 11 connected to the first sheet 1 via the second folding line L2.

[0027] For example, a user may fold blank 101B as shown in FIG. 1(a) by making valley folds at second fold line L2 and third fold line L3 so that the fourth sheet 4 and third sheet 3 overlap the first sheet 1 and second sheet 2, respectively, then fold fourth sheet 4 by making a mountain fold at first fold line L2 and a valley fold at fourth fold line L4 so that the fourth sheet 4 overlaps the third sheet 3 (so that the first sheet 1 and second sheet 2 sandwich the other sheets 3 and 4), and then make a valley fold at first fixing piece 11 of first sheet 1 so that the first fixing piece 11 overlaps the second sheet 2 and adheres them with glue, a sticker, or the like, to form a bag body 101F as shown in FIG. 1(b).

[0028] According to this embodiment, a single sheet 101B can be folded and secured with a seal or the like using a securing piece 11, so that a file 101F having two or more pockets can be produced simply and at low cost. Furthermore, since the single sheet 101B is made of paper, it is possible to provide a bag that is considerate of the global environment.

[0029] In the present invention, at least one of the sheets may be provided with a window through which the contents in the pocket can be seen.

[0030] <Modification> 2A and 2B are plan views of a bag body having three pockets according to a modification of the first embodiment of the present invention, with Fig. 2A being a front view of the bag body and Fig. 2B being a plan view of the unfolded blank of the bag body. Of the elements constituting bag body 102F according to this modification, those having similar functions are assigned the same reference numerals as in the first embodiment and their description will be omitted.

[0031] In this embodiment, the first cut line CL1 is formed between the first sheet 1 and the fourth sheet 4, and more specifically, it is formed to extend from both ends of the second folding line L2 and is formed into a wide U-shape so as to be sandwiched between the two extension line portions.

[0032] 2(a) and 2(b), in the bag body 102F according to this modification, windows 1a, 2a, and 4a are formed in the upper part of each of the sheets 1, 2, and 4, respectively, so that the contents inside the pockets can be visually confirmed. In the present invention, the number, size, and arrangement of the windows are not limited to this.

[0033] Furthermore, in the bag 102F according to this modified embodiment, as shown in FIGS. 2(a) and 2(b), index tabs 1T, 3T, and 4T are connected to the edges of the sheets 1, 3, and 4, respectively.

[0034] For example, a user may fold a paper blank 102B as shown in Figure 2(a) by mountain folding the fourth fold line L4 so that the fourth sheet 4 overlaps the third sheet 3, then by valley folding the third fold line L3 so that the third sheet 3 overlaps the second sheet 2, and then by valley folding the first fold line L1 so that the fourth sheet 4 overlaps the first sheet 1 (so that the first sheet 1 and the second sheet 2 sandwich the other sheets 3 and 4), and then by valley folding the first fixing piece 11 of the first sheet 1 so that it overlaps the second sheet 2 and adhering them with glue or a sticker, etc., to form a bag body 102F as shown in Figure 2(b).

[0035] According to this modified example, the same effect as in the first embodiment can be obtained, and in addition, it is possible to easily check whether or not there is paper stored in file 102F through windows 1a, 2a, and 4a without having to open file 102F one by one to check the contents.

[0036] Second Embodiment In the second embodiment of the present invention, unlike the first embodiment, the second fixed piece 12 and the third fixed piece 13 are connected to the first sheet 1, allowing it to take on an envelope shape and be usable as a file after opening.

[0037] Fig. 3 is a plan view of a bag having two pockets according to a second embodiment of the present invention, with Fig. 3(a) being a rear view of the bag before opening, Fig. 3(b) being a rear view of the bag after opening, and Fig. 3(c) being a plan view of the blank when the bag is unfolded. Of the elements constituting bags 201E and 201F and blank 201B according to this embodiment, those having similar functions are assigned the same reference numerals as in the first embodiment, and their description will be omitted.

[0038] In this embodiment, as shown in Figures 3(a) to 3(c), a second fixed piece 12 and a third fixed piece 13 are further connected to edges L5 and L6 of the first sheet 1, and the first fixed piece 11, the second fixed piece 12, and the third fixed piece 13 connected to the first sheet 1 are each folded over and fixed to the second sheet 2, thereby forming an envelope shape with two pockets inside. Furthermore, in this embodiment, the second fixed piece 12 is provided with a zipper portion Z for opening the envelope.

[0039] Furthermore, in the bag body 201F according to this embodiment, as shown in FIGS. 3(a) to 3(c), an index tab 3T is connected to the edge of the third sheet 3.

[0040] 3(a), a user may fold a paper blank 201B by making a valley fold along the third fold line L3 so that the third sheet 3 overlaps the second sheet 2, then by making a valley fold along the first fold line L1 so that the third sheet 3 overlaps the first sheet 1 (so that the first sheet 1 and the second sheet 2 sandwich the other sheet 3), and then by making a valley fold over the first fixing piece 11, the second fixing piece 12, and the third fixing piece 13 of the first sheet 1 so that they overlap the second sheet 2 and attach them with glue, a sticker, or the like, to form an envelope-shaped bag 201E as shown in FIG. 3(a). Then, by tearing and opening the zipper portion Z of the second fixing piece 12, a file-shaped bag 201F as shown in FIG. 3(b) is formed.

[0041] According to this embodiment, similar to the first embodiment, an envelope 201E or a file 201F having two pockets can be produced simply and at low cost, and furthermore, an environmentally friendly bag can be provided.

[0042] In the present invention, even with four or more sheets, the same effect as in the second embodiment can be achieved.

[0043] <First Modification> Fig. 4 is a plan view of a bag having three pockets according to a first modified example of the second embodiment of the present invention, with Fig. 4(a) being a rear view of the bag before opening, Fig. 4(b) being a rear view of the bag after opening, and Fig. 4(c) being a plan view of the blank when the bag is unfolded. Of the elements constituting bags 202E, 202F and blank 202B according to this modified example, those having similar functions are assigned the same reference numerals as in the second embodiment, and their description will be omitted.

[0044] As shown in FIG. 4(b), a blank 202B according to this modification is provided with a rectangular fourth sheet 4 connected to the third sheet 3 via a fourth folding line L4.

[0045] Furthermore, in the blank 202B according to this modification, as shown in FIG. 4(b), index tabs 2T, 3T, and 4T are connected to the edges of the second sheet 2 to the fourth sheet 4, respectively.

[0046] 4(c), a user can fold the fourth sheet 4 onto the third sheet 3 by mountain folding along the fourth fold line L4, then fold the third sheet 3 onto the second sheet 2 by valley folding along the third fold line L3, and then fold the fourth sheet 4 onto the first sheet 1 by valley folding along the first fold line L1 (so that the first sheet 1 and the second sheet 2 sandwich the other sheets 3 and 4). Finally, the user can valley fold the first fixing piece 11, the second fixing piece 12, and the third fixing piece 13 of the first sheet 1 onto the second sheet 2 and adhere them together with glue or a sticker, thereby creating an envelope-shaped bag 202E as shown in FIG. 4(a). Then, by tearing and opening the zipper portion Z of the second fixing piece 12, the bag becomes a file-shaped bag 202F as shown in FIG. 4(b).

[0047] <Second Modification> Fig. 5 is a plan view of a bag having four pockets according to a second modification of the second embodiment of the present invention, with Fig. 5(a) being a rear view of the bag before opening, Fig. 5(b) being a rear view of the bag after opening, and Fig. 5(c) being a plan view of the blank when the bag is unfolded. Of the elements constituting bags 203E, 203F and blank 203B according to this modification, those having similar functions are assigned the same reference numerals as in the second embodiment, and their description will be omitted.

[0048] As shown in FIG. 5(c), a blank 203B according to this modification is provided with a rectangular fifth sheet 5 connected to the fourth sheet 4 via a seventh folding line L7.

[0049] Furthermore, in blank 203B according to this modification, as shown in FIG. 5(c), index tabs 2T, 3T, 4T, and 5T are connected to the edges of second sheet 2 to fifth sheet 5, respectively.

[0050] For example, a user can fold a paper blank 203B as shown in Figure 5(c) by mountain folding the seventh fold line L7 so that the fifth sheet 5 overlaps the fourth sheet 4, then mountain folding the fourth fold line L4 so that the fifth sheet 5 overlaps the third sheet 3, then valley folding the third fold line L3 so that the third sheet 3 overlaps the second sheet 2, and then valley folding the first fold line L1 so that the fourth sheet 4 overlaps the first sheet 1 (so that the first sheet 1 and the second sheet 2 sandwich the other sheets 3, 4, and 5).Furthermore, the user can valley fold the first fixing piece 11, the second fixing piece 12, and the third fixing piece 13 of the first sheet 1 so that they overlap the second sheet 2 and adhere them together with glue, a sticker, or the like, to create an envelope-shaped bag body 203E as shown in Figure 5(a). Thereafter, when the zipper portion Z of the second fixing piece 12 is broken and opened, a file-shaped bag body 203F as shown in FIG. 5(b) is obtained.

[0051] <Third Modification> Fig. 6 is a plan view of a bag having five pockets according to a third modified example of the second embodiment of the present invention, with Fig. 6(a) being a rear view of the bag before opening, Fig. 6(b) being a rear view of the bag after opening, and Fig. 6(c) being a plan view of the blank when the bag is unfolded. Of the elements constituting bags 204E, 204F and blank 204B according to this modified example, those having similar functions are assigned the same reference numerals as in the second embodiment, and their description will be omitted.

[0052] As shown in FIG. 6(c), a blank 204B according to this modification is provided with a rectangular sixth sheet 6 connected to the fifth sheet 5 via an eighth folding line L8.

[0053] Furthermore, in blank 204B according to this modification, as shown in FIG. 6(c), index tabs 2T, 3T, 4T, 5T, and 6T are connected to the edges of second sheet 2 to sixth sheet 6, respectively.

[0054] For example, the user may fold the paper blank 204B shown in FIG. 6(c) by making a valley fold along the eighth folding line L8 so that the sixth sheet 6 overlaps the fifth sheet 5, by making a valley fold along the seventh folding line L7 so that the sixth sheet 6 overlaps the fourth sheet 4, by making a mountain fold along the fourth folding line L4 so that the fourth sheet 4 overlaps the third sheet 3, and then by making a mountain fold along the third folding line L4 so that the third sheet 3 overlaps the second sheet 2. 6(a) is obtained by valley-folding fifth sheet 5 along first fold line L1 so that it overlaps first sheet 1 (so that first sheet 1 and second sheet 2 sandwich the other sheets 3, 4, 5, and 6), and then valley-folding first fixing piece 11, second fixing piece 12, and third fixing piece 13 of first sheet 1 so that they overlap second sheet 2 and adhering them together with glue, a sticker, or the like. This results in envelope-shaped bag 204E as shown in FIG. 6(a). Thereafter, zipper portion Z of second fixing piece 12 is broken and opened, resulting in file-shaped bag 204F as shown in FIG. 6(b).

[0055] <Third embodiment> In the third embodiment of the present invention, unlike the first embodiment, the second fixed piece 12 and the third fixed piece 13 are each connected to the first sheet 1 by perforations, allowing it to take on an envelope shape, and when the second fixed piece 12 and the third fixed piece 13 are each torn along the perforations, it can be used as a file.

[0056] Fig. 7 is a plan view of a bag having three pockets according to a third embodiment of the present invention, with Fig. 7(a) being a rear view of the bag before opening, Fig. 7(b) being a rear view of the bag after opening and removing the second and third fixing pieces, and Fig. 7(c) being a plan view of the blank when the bag is unfolded. Of the elements constituting bags 301E and 301F and blank 301B according to this embodiment, those having similar functions are assigned the same reference numerals as in the first embodiment, and their description will be omitted.

[0057] In this embodiment, as shown in Figures 7(a) to 7(c), the second fixed piece 12 and the third fixed piece 13 are connected to the upper and right edges of the first sheet 1 via a first perforation P1 and a second perforation P2. That is, the first perforation P1 is formed between the first sheet 1 and the second fixed piece 12 so that the second fixed piece 12 can be separated from the first sheet 1, and the second perforation P2 is formed between the first sheet 1 and the third fixed piece 13 so that the third fixed piece 13 can be separated from the first sheet 1. In other words, the first perforation P1 and the second perforation P2 are formed on the upper and right edges of the first sheet 1, respectively, so that the second fixed piece 12 and the third fixed piece 13, which are fixed to the second sheet 2, can be separated to form a file shape having at least two pockets. In the present invention, a file having only the first perforation P1 or only the second perforation P2 is also acceptable. Also, in the present invention, it is possible to use a file with only the second fixed piece 12 cut off.

[0058] Furthermore, in the bag body 301F according to this embodiment, as shown in FIGS. 7(a) to 7(c), index tabs 3T and 4T are connected to the edges of the third sheet 3 and the fourth sheet 4, respectively.

[0059] For example, a user may fold a paper blank 301B as shown in Figure 7(c) by mountain folding the fourth fold line L4 so that the fourth sheet 4 overlaps the third sheet 3, then by valley folding the third fold line L3 so that the third sheet 3 overlaps the second sheet 2, and then by valley folding the first fold line L1 so that the fourth sheet 4 overlaps the first sheet 1 (so that the first sheet 1 and the second sheet 2 sandwich the other sheets 3 and 4), and then by valley folding the first fixing piece 11, the second fixing piece 12, and the third fixing piece 13 of the first sheet 1 so that they overlap the second sheet 2 and adhering them together with glue, a sticker, or the like, to form an envelope-shaped bag body 301E as shown in Figure 7(a). Then, when the second fixed piece 12 and the third fixed piece 13 are released from the adhesive and the first perforation P1 and the second perforation P2 formed on the base end edges of the second fixed piece 12 and the third fixed piece 13 are torn, a file-shaped bag body 301F as shown in Fig. 7(b) is obtained. Although the third fixed piece 13 is cut off in Fig. 7(b), the present invention also allows for an embodiment in which only the second perforation P2 is torn and the third fixed piece 13 remains adhesively fixed to the second sheet 2 (the same applies to each embodiment and modified example described below).

[0060] According to this embodiment, similarly to the first embodiment, an envelope 301E or a file 301F having three pockets can be produced easily and at low cost, and furthermore, an environmentally friendly bag can be provided.

[0061] In the present invention, even with five or more sheets, it is possible to achieve the same effect as in the third embodiment.

[0062] <First Modification> Fig. 8 is a plan view of a bag having four pockets according to a first modified example of the third embodiment of the present invention, with Fig. 8(a) being a rear view of the bag before opening, Fig. 8(b) being a rear view of the bag after opening and removing the second and third fixing pieces, and Fig. 8(c) being a plan view of the blank when the bag is unfolded. Of the elements constituting bags 302E and 302F and blank 302B according to this modified example, those having similar functions are assigned the same reference numerals as in the third embodiment, and their description will be omitted.

[0063] As shown in FIG. 8(b), a blank 302B according to this modification is provided with a rectangular fifth sheet 5 connected to the fourth sheet 4 via a seventh folding line L7.

[0064] Furthermore, in blank 302B according to this modification, as shown in FIG. 8(b), index tabs 3T, 4T, and 5T are connected to the edges of third sheet 3 to fifth sheet 5, respectively.

[0065] For example, a user can fold a paper blank 302B as shown in Figure 8(c) by mountain folding the seventh fold line L7 so that the fifth sheet 5 overlaps the fourth sheet 4, then mountain folding the fourth fold line L4 so that the fifth sheet 5 overlaps the third sheet 3, then valley folding the third fold line L3 so that the third sheet 3 overlaps the second sheet 2, and then valley folding the first fold line L1 so that the fourth sheet 4 overlaps the first sheet 1 (so that the first sheet 1 and the second sheet 2 sandwich the other sheets 3, 4, and 5).Furthermore, the user can valley fold the first fixing piece 11, the second fixing piece 12, and the third fixing piece 13 of the first sheet 1 so that they overlap the second sheet 2 and adhere them together with glue, a sticker, or the like, to create an envelope-shaped bag body 302E as shown in Figure 8(a). Thereafter, the second fixed piece 12 and the third fixed piece 13 are detached from the adhesive, and the first perforation P1 and the second perforation P2 formed on the base end edges of the second fixed piece 12 and the third fixed piece 13 are broken, respectively, to form a file-shaped bag body 302F as shown in Figure 8(b).

[0066] <Second Modification> Fig. 9 is a plan view of a bag having five pockets according to a second modified example of the third embodiment of the present invention, with Fig. 9(a) being a rear view of the bag before opening, Fig. 9(b) being a rear view of the bag after opening and removing the second and third fixing pieces, and Fig. 9(c) being a plan view of the blank when the bag is unfolded. Of the elements constituting bags 303E and 303F and blank 303B according to this modified example, those having similar functions are assigned the same reference numerals as in the third embodiment, and their description will be omitted.

[0067] As shown in FIG. 9(c), a blank 303B according to this modification is provided with a rectangular sixth sheet 6 that is connected to the fifth sheet 5 via an eighth folding line L8.

[0068] Furthermore, in blank 303B according to this modification, as shown in FIG. 9(c), index tabs 3T, 4T, 5T, and 6T are connected to the edges of third sheet 3 to sixth sheet 6, respectively.

[0069] For example, the user may fold the paper blank 303B shown in FIG. 9(c) by making a valley fold along the eighth folding line L8 so that the sixth sheet 6 overlaps the fifth sheet 5, by making a mountain fold along the seventh folding line L7 so that the fifth sheet 5 overlaps the fourth sheet 4, by making a mountain fold along the fourth folding line L4 so that the sixth sheet 6 overlaps the third sheet 3, and by making a mountain fold along the third folding line L5 so that the third sheet 3 overlaps the second sheet 2. 9(a)。 Then, the fourth sheet 4 is folded along the first fold line L1 so as to overlap the first sheet 1 (so that the first sheet 1 and the second sheet 2 sandwich the other sheets 3, 4, 5, and 6), and then the first fixing piece 11, the second fixing piece 12, and the third fixing piece 13 of the first sheet 1 are valley-folded so as to overlap the second sheet 2 and are adhered to each other with glue or a sticker, etc., to form an envelope-shaped bag 303E as shown in Fig. 9(a). After that, the adhesion of the second fixing piece 12 and the third fixing piece 13 is released, and the first perforation P1 and the second perforation P2 formed on the base end edges of the second fixing piece 12 and the third fixing piece 13 are broken, to form a file-shaped bag 303F as shown in Fig. 9(b).

[0070] <Fourth embodiment> In the fourth embodiment of the present invention, unlike the first embodiment, the second fixed piece 12 and the third fixed piece 13 are connected to the first sheet 1 by perforations, allowing the sheet to have an envelope shape, and when the second fixed piece 12 and the third fixed piece 13 are torn along the perforations, the sheet can be used as a file. Furthermore, as shown in Figures 10(a) to 10(c) described below, the second fixed piece 12 has a ninth fold line L9 that avoids the index tab.

[0071] Fig. 10 is a plan view of a bag having three pockets according to a fourth embodiment of the present invention, with Fig. 10(a) being a rear view of the bag before opening, Fig. 10(b) being a rear view of the bag after opening and removing the second and third fixing pieces, and Fig. 10(c) being a plan view of the blank when the bag is unfolded. Of the elements constituting bags 401E and 401F and blank 401B according to this embodiment, elements having similar functions are assigned the same reference numerals as in the first embodiment, and their description will be omitted.

[0072] In this embodiment, as shown in Figures 10(a) to 10(c), the second fixed piece 12 and the third fixed piece 13 are connected to the upper and right edges of the first sheet 1 via a first perforation P1 and a second perforation P2. That is, the first fixed piece 12 and the third fixed piece 13 fixed to the second sheet 2 are respectively formed on the upper and right edges of the first sheet 1 so that the first sheet 1 can assume the shape of a file with three pockets by separating the second fixed piece 12 and the third fixed piece 13 fixed to the second sheet 2. Also, in this embodiment, as shown in Figures 10(a) to 10(c), a ninth fold line L9 is provided on the second fixed piece 12 so as to avoid the index tab.

[0073] Furthermore, in the bag body 401F of this embodiment, as shown in Figures 10(a) to 10(c), index tabs 2T, 3T, and 4T are connected to the edges of the second sheet 2 to the fourth sheet 4, respectively.

[0074] For example, a user can fold a paper blank 401B as shown in Figure 10(e) by mountain folding the fourth fold line L4 so that the fourth sheet 4 overlaps the third sheet 3, then by valley folding the third fold line L3 so that the third sheet 3 overlaps the second sheet 2, and then by valley folding the first fold line L1 so that the fourth sheet 4 overlaps the first sheet 1 (so that the first sheet 1 and the second sheet 2 sandwich the other sheets 3 and 4), and then by valley folding the first fixing piece 11, the second fixing piece 12, and the third fixing piece 13 of the first sheet 1 so that they overlap the second sheet 2 and attaching them with glue, a sticker, etc., to create an envelope-shaped bag body 401E as shown in Figures 10(a) and 10(b). Then, the second fixed piece 12 and the third fixed piece 13 are detached from the adhesive and the first perforation P1 and the second perforation P2 formed on the base end edges of the second fixed piece 12 and the third fixed piece 13 are broken, respectively, to form a file-shaped bag body 401F as shown in Figures 10(c) and 10(d).

[0075] According to this embodiment, similar to the first embodiment, envelope 401E and file 401F having three pockets can be produced easily and at low cost, and furthermore, it is possible to provide an environmentally friendly bag.

[0076] Fifth Embodiment In the fifth embodiment of the present invention, unlike the first embodiment, the second fixed piece 12 and the third fixed piece 13 are connected to the first sheet 1 by perforations, allowing the sheet to have an envelope shape, and when the second fixed piece 12 and / or the third fixed piece 13 are torn along the perforations, the sheet can be used as a file. Furthermore, the third fixed piece 13 is provided with a third perforation P3 so that it can be torn along the edge of the second sheet when only the second fixed piece 12 is torn off.

[0077] Fig. 11 is a plan view of a bag having three pockets according to a fifth embodiment of the present invention, with Fig. 11(a) being a back view of the bag before opening, Fig. 11(b) being a front view of the bag after opening, removing the second fixing piece, and breaking the third perforation P3, and Fig. 11(c) being a plan view of the blank when the bag is unfolded. Of the elements constituting bags 501E and 501F and blank 501B according to this embodiment, elements having similar functions are designated by the same reference numerals as in the first embodiment, and their description will be omitted.

[0078] In this embodiment, as shown in Figures 11(a) to 11(c), a second fixed piece 12 and a third fixed piece 13 are connected to the upper and right edges of the first sheet 1 via a first perforation P1 and a second perforation P2. That is, the first and second perforations P1 and P2 are formed on the upper and right edges of the first sheet 1, respectively, so that the first sheet 1 can assume the shape of a file having three pockets by cutting off the second fixed piece 12 fixed to the second sheet 2. Also, in this embodiment, as shown in Figures 11(a) to 11(c), a third perforation P3 is formed on the third fixed piece 13 so that it can be cut along the edge of the second sheet when only the second fixed piece 12 is cut off.

[0079] Furthermore, in the bag body 501F according to this embodiment, as shown in FIGS. 11(a) to 11(c), index tabs 3T and 4T are connected to the edges of the third sheet 3 and the fourth sheet 4, respectively.

[0080] For example, a user can fold a paper blank 501B as shown in Figure 11(c) by mountain folding the fourth fold line L4 so that the fourth sheet 4 overlaps the third sheet 3, then by valley folding the third fold line L3 so that the third sheet 3 overlaps the second sheet 2, and then by valley folding the first fold line L1 so that the fourth sheet 4 overlaps the first sheet 1 (so that the first sheet 1 and the second sheet 2 sandwich the other sheets 3 and 4), and then by valley folding the first fixing piece 11, the second fixing piece 12, and the third fixing piece 13 of the first sheet 1 so that they overlap the second sheet 2 and adhering them together with glue, a sticker, etc., to create an envelope-shaped bag body 501E as shown in Figure 11(a). Then, the second fixed piece 12 is detached from the adhesive, the first perforation P1 formed on the base edge of the second fixed piece 12 is broken, the third perforation P3 of the third fixed piece 13 is broken, and then part of the second perforation P2 is broken upward, resulting in a file-shaped bag body 501F as shown in Figure 11(b).

[0081] According to this embodiment, as in the first embodiment, envelopes 501E and files 501F each having three pockets can be produced easily and at low cost, and an environmentally friendly bag can be provided. In addition, by tearing the third perforation P3, the edges of the opening are aligned, allowing documents to be inserted and removed more quickly.

[0082] Sixth Embodiment In the sixth embodiment of the present invention, unlike the first embodiment, the second fixed piece 12 is connected to the first sheet 1 and the third fixed piece 23 is connected to the second sheet 2, making it possible to assume the shape of a so-called Western-style envelope and to use it as a file after opening.

[0083] Fig. 12 is a plan view of a bag having three pockets according to a sixth embodiment of the present invention, in which Fig. 12(a) is a front view of the bag before opening, Fig. 12(b) is a back view of the bag before opening, and Fig. 12(c) is a plan view of the blank after the bag has been unfolded. Of the elements constituting a bag 601E and a blank 601B according to this embodiment, those having similar functions are assigned the same reference numerals as in the first embodiment, and their description will be omitted.

[0084] 12(a) to 12(c), in this embodiment, a substantially triangular second fixed piece 12 is further connected to edge L5 of the first sheet 1, and a third fixed piece 23 is further connected to edge L10 of the second sheet 2. The first fixed piece 11 and the second fixed piece 12 connected to the first sheet 1 are each folded and fixed to the second sheet 2, and the third fixed piece 23 connected to the second sheet 2 is folded and fixed to the first sheet 1, thereby forming an envelope shape with two pockets inside. That is, instead of the third fixed piece 13 connected to the first sheet 1 being folded and fixed to the second sheet 2 in the above embodiments, the third fixed piece 23 connected to the second sheet 2 is folded and fixed to the first sheet 1.

[0085] Furthermore, in the bag body 601F according to this embodiment, as shown in Figures 12(a) to 12(c), index tabs 2T, 3T, and 4T are connected to the edges of the second sheet 2 to the fourth sheet 4.

[0086] 12(c), the user may fold the paper blank 601B by, for example, making a valley fold along the fourth fold line L4 so that the fourth sheet 4 overlaps the third sheet 3, then by making a valley fold along the third fold line L3 so that the fourth sheet 4 overlaps the second sheet 2, and then by making a valley fold along the first fold line L1 so that the third sheet 3 overlaps the first sheet 1 (so that the first sheet 1 and the second sheet 2 sandwich the other sheets 3 and 4), and then by making a valley fold so that the first fixing piece 11 and the second fixing piece 12 of the first sheet 1 overlap the second sheet 2 and adhere them with glue or a sticker, and then by making a valley fold so that the third fixing piece 23 of the second sheet 2 overlaps the first sheet 1 and adheres them with glue or a sticker, to form the envelope-shaped bag 601E shown in FIGS. 12(a) and 12(b). When opened, the bag is a file-shaped bag.

[0087] According to this embodiment, similar to the first embodiment, an envelope 601E or a file having three pockets can be produced easily and at low cost, and furthermore, an environmentally friendly bag can be provided.

[0088] Seventh Embodiment In the seventh embodiment of the present invention, unlike the first embodiment, a second cut line CL2 is formed on the edge between the second sheet 2 and the third sheet 3 so that the first fixing piece 11 can be inserted and fixed.

[0089] Fig. 13 is a plan view of a bag body having three pockets according to a seventh embodiment of the present invention, with Fig. 13(a) being a front view of the bag body, Fig. 13(b) being a back view of the bag body, and Fig. 13(c) being a plan view of the blank when the bag body is unfolded. Of the elements constituting the bag body 701F and blank 701B according to this embodiment, those having similar functions are assigned the same reference numerals as in the first embodiment, and their description will be omitted.

[0090] In this embodiment, as shown in Figures 13(a) to 13(c), a pair of first fixing pieces 11 are provided by making an incision between the fourth sheet 4 and the first sheet 1 to connect both end portions and by making an incision so that two approximately inverted U-shaped incisions spaced apart between the end portions are formed, and a pair of second incision lines CL2 are formed on the edge between the second sheet 2 and the third sheet 3 so that the first fixing pieces 11 can be inserted and fixed.

[0091] Furthermore, in the bag body 701F according to this embodiment, as shown in Figures 13(a) to 13(c), index tabs 2T, 3T, and 4T are connected to the edges of the second sheet 2 to the fourth sheet 4.

[0092] 13(c), a user can fold the paper blank 701B by, for example, making a mountain fold along the fourth fold line L4 so that the fourth sheet 4 overlaps the third sheet 3, then by making a mountain fold along the third fold line L3 so that the fourth sheet 4 overlaps the second sheet 2, and then by making a mountain fold along the first fold line L1 so that the third sheet 3 overlaps the first sheet 1 (so that the first sheet 1 and the second sheet 2 sandwich the other sheets 3 and 4), and then by inserting and fixing the first fixing piece 11 of the first sheet 1 into the second cut line CL2 of the second sheet 2, thereby forming a file-shaped bag 701F as shown in FIGS. 13(a) and 13(b). The present invention also allows for a configuration in which the second fold line L2 is provided in a straight line between the first sheet 1 and the fourth sheet 4, and the first sheet 1 and the fourth sheet 4 are not separated. In this case, the position of the index tab and the folding method of the sheet can be designed as appropriate.

[0093] According to this embodiment, like the first embodiment, a file 701F having three pockets can be produced easily and at low cost, and an environmentally friendly bag can be provided. Furthermore, in the file 701F, by removing the first fixing piece 11 of the first sheet 1 from the second cut line CL2 of the second sheet 2, the file becomes a single sheet, which can be used as a poster by applying a printing process to the surface, for example, and therefore the poster and file can be used repeatedly.

[0094] <Other> The present invention is not limited to the above-described embodiment or the modifications described throughout, and appropriate changes and modifications can be made without departing from the technical concept of the present invention. [Explanation of symbols]

[0095] 101F, 102F, 201F, 202F, 203F, 204F, 301F, 302F, 303F, 401F, 501F, 601F, 701F file (example of bag) 201E, 202E, 203E, 204E, 301E, 302E, 303E, 401E, 501E, 601E Envelope (example of a bag) 1~6 1st to 6th sheets 11 1st fixed piece 12 Second fixed piece 13, 23 Third fixed piece 1T, 2T, 3T, 4T, 5T, 6T index tabs L1~L10: 1st to 10th edges (1st to 10th folding lines) CL1 First cutting line CL2 Second cutting line P1~P3 1st to 3rd perforations 101B, 102B, 201B, 202B, 203B, 204B, 301B, 302B, 303B, 401B, 501B, 601B, 701B bag blanks

Claims

1. A flat bag in which a pocket is formed by folding a single paper sheet, The single paper sheet is a first sheet having a substantially rectangular shape and a first fixing piece connected to one of its upper and lower edges; a substantially rectangular second sheet connected to one of the left and right edges of the first sheet; a substantially rectangular third sheet connected to either the upper or lower edge of the second sheet, the first sheet and the second sheet are folded at their connecting portions so as to sandwich another sheet between them, and the first fixing piece connected to the first sheet is folded over and fixed to the second sheet, thereby forming a file shape having at least two pockets; a second fixing piece and a third fixing piece are further connected to the other of the upper and lower edges and the other of the left and right edges of the first sheet; A bag body characterized in that the first fixed piece, the second fixed piece, and the third fixed piece, which are connected to the first sheet, are each folded over and fixed to the second sheet, thereby forming an envelope shape with at least two pockets inside.

2. The single paper sheet further includes a substantially rectangular fourth sheet connected to either the left or right edge of the third sheet, 2. The bag body according to claim 1, wherein the fourth sheet is provided with a first cut line that corresponds to an outer contour of the first fixing piece that is connected to the first sheet.

3. 3. The bag according to claim 2, wherein the single paper sheet further comprises a generally rectangular fifth sheet connected to either the left or right edge of the fourth sheet.

4. 4. The bag according to claim 1, wherein the second fixing piece is provided with a zipper portion for opening the envelope.

5. A bag body as described in any one of claims 1 to 3, characterized in that a first perforation is formed between the first sheet and the second fixed piece so that the second fixed piece can be separated from the first sheet, and a second perforation is formed between the first sheet and the third fixed piece so that the third fixed piece can be separated from the first sheet.

6. A bag body as described in any one of claims 1 to 3, characterized in that instead of folding and fixing the third fixed piece connected to the first sheet to the second sheet, the third fixed piece connected to the second sheet is folded and fixed to the first sheet, thereby forming an envelope shape with at least two pockets inside.

7. 3. The bag body according to claim 1, wherein a second cut line is formed on the edge between the second sheet and the third sheet so that the first fixing piece can be inserted and fixed.

8. 3. The bag according to claim 1, wherein an index tab is connected to the edge of each sheet.

9. 3. The bag body according to claim 1, wherein a window is formed in the upper part of each sheet to enable the contents of the pocket to be visually confirmed.

10. A bag blank according to claim 1 or claim 2, a rectangular first sheet having a first fold line and a second fold line extending in a direction perpendicular to the first fold line; a rectangular second sheet connected to the first sheet via the first folding line and having a third folding line extending in a direction perpendicular to the first folding line; a rectangular third sheet connected to the second sheet via the third folding line; a first fixing piece connected to the first sheet via the second folding line; A bag blank comprising at least:

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