Three-dimensionally deformable paper bag

Abstract

To provide a three-dimensionally deformable paper bag.SOLUTION: A paper bag 100 which is closed on its sides and bottom and open on the top includes: a bag body part 200 that is open on the top; a left-side through hole 400 that is provided on the left side of the bag body part 200 and allows a user to insert fingers or a hand; a folded-back part 300 that is disposed on the right side of the bag body part 200, passes through the left-side through hole 400, and is folded back above the left-side through hole 400 on the left side; and a fold line 600 for three-dimensionally deforming the bag body part 200. The folded-back part 300 passes through the left-side through hole 400 and is folded back to the left, thereby forming a right-side through hole 330 on the right side, and the bag body part 200 can be three-dimensionally deformed by being folded along the fold line 600.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a paper bag. [Background technology]

[0002] Generally, paper bags such as envelopes are used by folding back the top portion (lid or flap) and attaching the folded portion with double-sided tape or glue.

[0003] Patent Document 1 discloses a paper bag that can be hung with the fingers, is easy to hold, is safe, can be produced simply and at low cost, and is recyclable.

[0004] Specifically, the paper bag in Patent Document 1 has carrying holes formed on the front and back of the bag near the opening, and when the bag is folded flat, two of the holes overlap, and when the bag is folded along the fold lines, all four holes overlap to form carrying holes, and the folded part has four sheets of paper overlapping, which increases its strength and makes it less likely to tear. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Utility Model Registration No. 3150081 Summary of the Invention [Problem to be solved by the invention]

[0006] However, although the invention of Patent Document 1 improves the strength of the handle, simply drilling through holes in the handle may cause the user's hand to be injured by the paper of the handle.

[0007] In addition, the invention of Patent Document 1 is configured so that a gusset is provided at the bottom of the paper bag from the beginning, which means that the folded gusset portion becomes thick and increases in thickness when stacked, resulting in the problem that a large amount of space is required when storing multiple paper bags or when carrying them around.

[0008] The main object of the present invention is to provide a paper bag having an improved handle strength and preventing a user from being injured by the paper of the handle.

[0009] Another object of the present invention is to provide a paper bag that is easy for users to carry.

[0010] Another object of the present invention is to provide a paper bag that is three-dimensionally deformable.

[0011] Another object of the present invention is to reduce the storage space or carrying space required when storing or carrying a plurality of paper bags. [Means for solving the problem]

[0012] A paper bag according to a first aspect of the present invention is a paper bag that is closed at the sides and bottom and open at the top, A bag body portion having an opening at the top; A left through hole provided on the left side of the bag body portion through which a user can pass a finger or hand; a folded-back portion disposed on the right side of the bag body portion, passing through the left-side through hole and folded back above the left-side through hole on the left side; A fold line for three-dimensionally deforming the bag body portion, The folded-back portion passes through the left-side through hole and is folded back to the left, thereby providing a right-side through hole on the right side, The paper bag has a body that can be deformed three-dimensionally by folding along the fold lines.

[0013] Such a paper bag can be deformed three-dimensionally, has improved strength at the handle, is less likely to injure the user with the paper handle, and is easy to hold.

[0014] A paper bag according to a second aspect of the present invention is the paper bag according to the first aspect, wherein the bag body has a front surface portion on a front side and a back surface portion on a back side, The fold line has a front fold line and a back fold line, The surface fold line includes a surface center line provided vertically at the center of the upper surface, a left oblique line extending from a lower portion of the front center line toward a left bottom portion of the front portion; a right oblique line extending from a lower portion of the front center line toward a right bottom portion of the front portion; The back folding line includes a back center line provided vertically at the center of the upper part of the back surface, a back left diagonal line extending from a lower portion of the back center line toward a left bottom portion of the back portion; The paper bag has a right oblique line on the back surface extending from the lower part of the back surface center line toward the right bottom part of the back surface.

[0015] Such a paper bag can be easily transformed into a three-dimensional shape.

[0016] A paper bag according to a third aspect of the present invention is the paper bag according to the first aspect, wherein the bag body has a front surface portion on a front side and a back surface portion on a back side, The fold line has a front fold line and a back fold line, The surface fold line is a surface left diagonal line provided from the upper end center of the surface portion to the left bottom of the surface portion; a right oblique line extending from the upper center of the surface portion toward the right bottom of the surface portion; The back folding line is a back left oblique line provided from the upper end center of the back portion to the left bottom portion of the back portion; The paper bag has a right oblique line on the back surface extending from the center of the upper end of the back surface toward the right bottom of the back surface.

[0017] Such a paper bag can be easily transformed into a three-dimensional shape.

[0018] A paper bag according to a fourth aspect of the present invention is a paper bag that is closed at the sides and bottom and open at the top, A bag body portion having an opening at the top; A rear through hole provided on the rear side of the bag body through which a user can pass a finger or hand; A folded-back portion is disposed on the front surface side of the bag body portion, passes through the rear surface through hole, and is folded back above the rear surface through hole on the rear surface side; A fold line for three-dimensionally deforming the bag body portion, The folded portion passes through the rear surface through hole and is folded back to the rear surface side, thereby providing a front surface through hole on the front surface side, The paper bag has a body that can be deformed three-dimensionally by folding along the fold lines.

[0019] Such a paper bag can be deformed three-dimensionally, has improved strength at the handle, is less likely to injure the user with the paper handle, and is easy to hold.

[0020] A paper bag according to a fifth aspect of the present invention is the paper bag according to the fourth aspect, wherein the bag body has a front surface portion on a front side and a back surface portion on a back side, The fold line has a front fold line and a back fold line, The surface fold line is a parabolic subsurface curve provided on the underside of the surface portion; a left parabolic surface curve provided on the left side of the surface portion; a right parabolic surface curve provided on the right side of the surface portion; The back fold line is a parabolic back lower curve provided on the lower side of the back portion; a parabolic back surface left curve provided on the left side of the back surface portion; The paper bag has a parabolic right back curve provided on the right side of the back portion.

[0021] Such a paper bag can be easily transformed into a three-dimensional shape. [Brief description of the drawings]

[0022] [Figure 1] FIG. 2 is a development view of a paper bag according to one embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. 13 is a front view of the paper bag according to the embodiment when it is three-dimensionally deformed. [Diagram 5] FIG. 13 is a rear view of the paper bag according to the embodiment after it has been three-dimensionally deformed. [Figure 6] FIG. 13 is a side view of the paper bag according to the embodiment when it is three-dimensionally deformed. [Figure 7] FIG. 13 is a perspective view of the paper bag according to the embodiment when it is three-dimensionally deformed. [Figure 8] FIG. 2 is a development view of a paper bag according to one embodiment of the present invention. [Figure 9] FIG. 2 is a development view of a paper bag according to one embodiment of the present invention. [Figure 10] FIG. 2 is a development view of a paper bag according to one embodiment of the present invention. [Figure 11] FIG. [Figure 12] FIG. [Figure 13] FIG. 13 is a perspective view of the paper bag according to the embodiment when it is three-dimensionally deformed. [Figure 14] FIG. 2 is a development view of a paper bag according to one embodiment of the present invention. [Figure 15] FIG. 13 is a front view of the paper bag according to the embodiment when it is three-dimensionally deformed. [Figure 16] FIG. 13 is a rear view of the paper bag according to the embodiment after it has been three-dimensionally deformed. [Figure 17] FIG. 2 is a development view of a paper bag according to one embodiment of the present invention. [Figure 18] FIG. 2 is a development view of a paper bag according to one embodiment of the present invention. [Figure 19] FIG. 2 is a front view of a folded portion of a paper bag according to one embodiment of the present invention. [Figure 20] FIG. 2 is a front view of a folded portion of a paper bag according to one embodiment of the present invention. [Figure 21] FIG. 2 is a front view of a folded portion of a paper bag according to one embodiment of the present invention. [Figure 22] FIG. 2 is a development view of a paper bag according to one embodiment of the present invention. [Figure 23] FIG. 2 is a development view of a paper bag according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, an example of the present invention will be described with reference to the drawings.

[0024] First Embodiment As shown in FIGS. 1 to 7, the paper bag 100 according to the first embodiment includes a bag body 200 that is open on the upper side (the positive y-axis direction side), a first folded portion 300 that is provided on the right side surface (x-axis positive direction side) and folded upward toward the left side surface (x-axis negative direction side); A left through hole 400 provided on the left side surface (x-axis negative direction side) of the bag body portion 200; a first held portion 500 into which a part of the first folded portion 300 is inserted; and a fold line 600 for three-dimensionally deforming the bag body portion 200.

[0025] The bag body portion 200 includes a surface portion 210 disposed on the front side (the positive z-axis direction side), and a back surface portion 220 disposed on the back side (the z-axis negative direction side).

[0026] In this embodiment, the bag main body 200 has a front surface 210 and a back surface 220 formed from a single piece of paper, and the front surface 210 and the back surface 220 are formed by folding back the paper.

[0027] The front surface portion 210 and the back surface portion 220 are formed by folding back the left end portion 231 and the right end portion 232 which are the end portions 230 .

[0028] In this embodiment, the connection is made at approximately the center of the back surface side 220 (approximately the center in the x-axis direction).

[0029] The front surface portion 210 includes a front surface lower connection portion 211 that is disposed on the lower side (y-axis negative direction side) folded back to the back surface side (z-axis negative direction side).

[0030] The back surface portion 220 is disposed on the right side (x-axis positive direction side) of the front surface portion 210, and has a left back surface portion 221 folded back to the back surface side (z-axis negative direction side). The right back surface portion 222 is disposed on the left side (the negative x-axis direction side) of the front surface portion 210 and is folded back to the back surface side (the negative z-axis direction side).

[0031] The left back surface portion 221 includes a left connection portion 221a that is connected to the right back surface portion 222, and a left lower connection portion 221b that connects to the surface lower connection portion 211.

[0032] The right back surface portion 222 has a right connection portion 222a that is connected to the left connection portion 221a of the left back surface portion 221, and a lower right connecting portion 222b that connects to the lower front connecting portion 211.

[0033] In this embodiment, the right connecting portion 222a is adhered onto the left connecting portion 221a.

[0034] The end (x-axis direction end) of the right connecting portion 222a (right back surface portion 222) is slightly to the right (x-axis negative direction side) of the center of the back surface portion 220, and is easy to fold at the mountain fold line 600 in the center of the back surface.

[0035] Moreover, by displacing the end (x-axis direction end) of the right connection portion 222a (right back surface portion 222) from the center of the back surface portion 220, the adhesion between the left connection portion 221a and the right connection portion 222a becomes less likely to come off.

[0036] In this embodiment, the front surface portion 210 and the back surface portion 220 are formed into a cylindrical shape by bonding the left connection portion 221a and the right connection portion 222a together with glue or the like, and then the front surface lower connection portion 212 is folded back to the back surface side, and the left lower connection portion 221b and the right lower connection portion 222b are bonded together with glue or the like.

[0037] This forms the bag body 200, which is open on the upper side (the y-axis positive direction side).

[0038] The first folded portion 300 is composed of a part of the right side (x-axis positive direction side) of the front portion 210 and the back portion 220, and is composed of a first folded line 310 which is a folded line arranged at the upper portion, The first holding portion 320 is a holding portion that is held by the first held portion 500.

[0039] The first folded portion 300 can be folded back about the first folding line 310 and passed through the left through-hole 400 .

[0040] The first folded portion 300 is rotated about the first folding line 310 as an axis and folded back to the rear side (the negative z-axis direction side), thereby forming a right-side through-hole 330.

[0041] The shape of the first folded portion 300 (the shape of the right-side through-hole 330) is slightly smaller than the left-side through-hole 400 except for the first holding portion 320, and the first folded portion 300 is structured to easily pass through the left-side through-hole 400.

[0042] In this embodiment, when the left and right sides of the upper part of the bag main body portion 200 are stacked, the left side through hole 400 is approximately elliptical when viewed in a plane, so the shape of the folded portion 300 (the shape of the right side through hole 330) is also approximately elliptical when viewed in a plane.

[0043] Specifically, the folded-back portion 300 may have rounded corners so as to prevent the user from cutting his or her hands.

[0044] The left through-hole 400 and the right through-hole 330 may be cut in a wavy shape to prevent the user from cutting his / her hands. This is the same for the other embodiments.

[0045] Furthermore, the shape of the first folded portion 300 (the shape of the right-side through hole 330) is not limited as long as it can be passed through the left-side through hole 400 and the first holding portion 320 can be inserted into the first held portion 500 and fixed.

[0046] When first folded portion 300 is not folded back at first folding line 310, first holding portion 320 is disposed below first folded portion 300 (on the negative y-axis direction side).

[0047] In this embodiment, when not folded back at the first folding line 310, the first holding portion 320 has a protruding shape that protrudes downward (toward the negative y-axis direction).

[0048] The left side through hole 400 is configured on the left side of the bag main body portion 200 and is positioned at the same position as the first folded portion 300, and is positioned on the left side of the bag main body portion 200 so that the first folded portion 300 can pass through the left side through hole 400 when the left and right sides of the upper part of the bag main body portion 200 are stacked.

[0049] Specifically, the left side through hole 400 is slightly larger than the first folded portion 300, and is configured so that when the left and right sides of the upper part of the bag main body portion 200 are stacked together and the first folded portion 300 rotates to the left around the first fold line 310, the first folded portion 300 can easily pass through the left side through hole 400.

[0050] In this embodiment, the left through-hole 400 has a generally elliptical shape in a plan view.

[0051] The first held portion 500 is located on the upper side (positive y-axis side) of the left through hole 400, and is the portion into which the first holding portion 320 is inserted when the first folded portion 300 is folded back to the left side (negative x-axis side).

[0052] In this embodiment, by inserting the first holding portion 320 into the first held portion 500, the first folded portion 300 folded back to the left (x-axis negative direction side) is fixed and held in a detachable state.

[0053] This makes it difficult for the first folded portion 300 to open, and the user can easily hold the paper bag 100 by passing his / her fingers or hands through the right through-hole 330 and the left through-hole 400.

[0054] In addition, by folding back first fold portion 300, the strength of the handle is improved, and since first fold line 310 comes into contact with the user's fingers or hand, the user can be effectively prevented from being injured by the paper.

[0055] It should be noted that the first holding portion 320 and the first held portion 500 may not be provided.

[0056] Even in such a case, the strength of the handle portion is improved by folding back first fold portion 300, and since first fold line 310 comes into contact with the user's fingers or hand, the user can be effectively prevented from being injured by the paper.

[0057] The fold line 600 includes a first front fold line 610 which is a front fold line on the front side (positive z-axis direction side) and a first back fold line 620 which is a back fold line on the back side (negative z-axis direction side).

[0058] In this embodiment, the first surface fold line 610 is a first surface center line 611 that is a surface center line provided vertically at the center of the upper part (center in the x-axis direction) on the surface side (positive z-axis direction side), A first surface left oblique line 612 that is a surface left oblique line provided from a lower portion of the first surface center line 611 toward the left bottom portion (y-axis negative direction and x-axis negative direction) of the bag body portion 200; A first surface right oblique line 613 that is a surface right oblique line provided from a lower portion of the first surface center line 611 toward the right bottom portion of the bag body portion 200; The first surface has a first surface center line 611, and a surface horizontal line 614 extending horizontally at the point where the first surface left diagonal line 612 and the first surface right diagonal line 613 intersect.

[0059] The first front center line 611, the first front left diagonal line 612, and the first front right diagonal line 613 are mountain fold lines, and the front horizontal line 614 is a valley fold line.

[0060] It should be noted that the first surface center line 611 , the first surface left diagonal line 612 , the first surface right diagonal line 613 and the surface horizontal line 614 may be any line that assists the user in folding the bag body portion 200 .

[0061] In this embodiment, the first back folding line 620 is a first back center line 621 provided vertically at the center of the upper part (center in the x-axis direction) on the back side (negative z-axis direction side), A first back surface left diagonal line 622 is provided from the lower part of the first back surface center line 621 toward the left bottom part of the bag body portion 200, A first back surface right oblique line 623 is provided from the lower part of the first back surface center line 621 toward the right bottom part of the bag body portion 200, The first back surface has a first back surface center line 621, and a back surface horizontal line 624 extending horizontally at a point where the first back surface left oblique line 622 and the first back surface right oblique line 623 intersect.

[0062] The first reverse surface central line 621, the first reverse surface left diagonal line 622, and the first reverse surface right diagonal line 623 are mountain fold lines, and the reverse surface horizontal line 624 is a valley fold line.

[0063] The front horizontal line 614 and the back horizontal line 624 are disposed at the same position in the vertical direction (y-axis direction), making it easy for the right side through-hole 330 and the left side through-hole 400 to overlap.

[0064] It should be noted that the first surface center line 611 , the first surface left diagonal line 612 , the first surface right diagonal line 613 and the surface horizontal line 614 may be any line that assists the user in folding the bag body portion 200 .

[0065] A user can fold the paper bag 100 along the fold lines 600 to give it a three-dimensional shape as shown in FIG.

[0066] In addition, a lid portion may be provided on the upper portion of the bag body portion 200.

[0067] In addition, in this embodiment, the point where the first front surface center line 611, the first front surface left diagonal line 612, and the first front surface right diagonal line 613 intersect (the point where the first back surface center line 621, the first back surface left diagonal line 622, and the first back surface right diagonal line 623 intersect) is below the folded portion 300 (the negative y-axis direction side), but as shown in Figure 8, it may be the center in the vertical direction of the folded portion 300, or it may be further upward, etc., and the position is not limited.

[0068] As shown in FIG. 8, the front horizontal line 614 and the back horizontal line 624 may not be provided.

[0069] Furthermore, as shown in FIG. 9, the first front left diagonal line 612 and the first front right diagonal line 613 (the first back side left diagonal line 622 and the first back side right diagonal line 623) do not have to have the same length.

[0070] In this case, the positions of the left end 231 and the right end 232 shown in FIG. 9 differ from those in FIGS. 1 to 8, and the location of the underside connection portion 211 also differs.

[0071] Even in this case, the bag body 200 can be three-dimensionally deformed.

[0072] <Second embodiment> The second embodiment is an embodiment in which the folding line 600 is different from that of the first embodiment. The same components as those of the first embodiment will be referred to by the same reference numerals as those of the first embodiment. Furthermore, the description of the same components as those of the first embodiment will be omitted or will be simplified.

[0073] As shown in Figures 10 to 13, in the second embodiment, the fold line 600 has a second surface fold line 630 which is a surface fold line on the surface side (positive z-axis direction side) and a second back surface fold line 640 which is a back surface fold line on the back surface side (negative z-axis direction side).

[0074] In this embodiment, the second surface fold line 630 is a second surface left oblique line 631 that is a surface left oblique line provided from the upper end center part (the center part in the x-axis direction) of the surface part 210 toward the left bottom part (the y-axis negative direction and the x-axis negative direction) of the bag main body part 200, and a second front surface right oblique line 632 that is a front surface right oblique line provided from the upper end center part (center part in the x-axis direction) of the front surface part 210 toward the right bottom part of the bag body part 200.

[0075] The left diagonal line 631 on the second front surface and the right diagonal line 632 on the second front surface are mountain folds.

[0076] The second front left oblique line 631 and the second front right oblique line 632 may be any line that assists the user in folding the bag main body portion 200.

[0077] In this embodiment, the second back surface fold line 640 is a second back surface left oblique line 641 provided from the upper end center part (the center part in the x-axis direction) of the back surface part 220 toward the left bottom part of the bag main body part 200, and a second back surface right oblique line 642 provided from the upper center of the back surface portion 220 toward the right bottom portion of the bag body portion 200.

[0078] The second back surface left diagonal line 641 and the second back surface right diagonal line 642 are mountain fold lines.

[0079] The second back surface left oblique line 641 and the second back surface right oblique line 642 may be any line that assists the user in folding the bag main body portion 200.

[0080] A user can fold the paper bag 100 along the fold lines 600 to give it a three-dimensional shape as shown in FIG.

[0081] In addition, a lid portion may be provided on the upper portion of the bag body portion 200.

[0082] <Third embodiment> The third embodiment is an embodiment of a fold line 600 different from the first and second embodiments. The symbols of the first embodiment are used for the same configurations as those of the first embodiment. Also, the description of the same configurations as those of the first embodiment may be omitted or simplified.

[0083] As shown in FIGS. 14 to 16, the paper bag 100 according to the third embodiment includes a bag body 200 that is open on the upper side (the positive y-axis direction side), a first folded portion 300 which is folded upward toward the back surface side (the z-axis negative direction side); A rear through hole 700 provided on the rear side (z-axis negative direction side) of the bag body portion 200; a first held portion 500 into which a part of the first folded portion 300 is inserted; and a fold line 600 for three-dimensionally deforming the bag body portion 200.

[0084] The bag body portion 200 includes a surface portion 210 disposed on the front side (the positive z-axis direction side), and a back surface portion 220 disposed on the back side (the z-axis negative direction side).

[0085] In this embodiment, the bag body 200 has a front surface 210 and a back surface 220 formed from a single sheet of paper, and the front surface 210 and the back surface 220 are formed by folding back the paper at an end 230.

[0086] The front surface portion 210 has a front surface lower connection portion 211 disposed on the lower side (y-axis negative direction side) folded back to the back surface side (z-axis negative direction side), and a front side lateral side connecting portion 212 disposed on the lateral side (x-axis direction side) folded back to the rear side (z-axis negative direction side).

[0087] The back surface portion 220 has a back surface side connection portion 223 that connects to the front surface side connection portion 212, and a back surface lower connection portion 224 that connects to the front surface lower connection portion 212.

[0088] In this embodiment, the front surface portion 210 and the back surface portion 220 are folded at the front surface side connection portion 231, and the front surface side connection portion 212 and the back surface side connection portion 240 are bonded together with glue or the like to form a tube, and then the front surface lower connection portion 212 is folded back to the back surface side, and the front surface lower connection portion 212 and the back surface lower connection portion 222 are bonded together with glue or the like.

[0089] In this embodiment, the front side lateral connection portion 212 and the back side lateral connection portion 240 are bonded on the back side 220 side (z-axis negative direction side).

[0090] This forms the bag body 200, which is open on the upper side (the y-axis positive direction side).

[0091] End portion 230 is a portion that connects front surface portion 210 and back surface portion 220. In this embodiment, end portion 230 is a folded portion that forms front surface portion 210 and back surface portion 220 by folding a single sheet of paper.

[0092] The first folded portion 300 is formed from a part of the surface portion 210, and includes a first folded line 310, which is a folded line disposed at the upper portion, and The first holding portion 320 is a holding portion that is held by the first held portion 500.

[0093] The first folded portion 300 can be folded back about the first folding line 310 as an axis and passed through the rear surface through-hole 700 .

[0094] The first folded portion 300 is rotated about the first folding line 310 as an axis and folded back to the rear side (the negative z-axis direction side), thereby forming a surface through-hole 750.

[0095] The shape of the first folded portion 300 (shape of the front surface through hole) is slightly smaller than the rear surface through hole 700 except for the first holding portion 320, and the structure is such that the first folded portion 300 can easily pass through the rear surface through hole 700.

[0096] In this embodiment, since the rear surface through-hole 700 has a generally elliptical shape when viewed in the xy plane, the shape of the folded portion 300 (the shape of the front surface through-hole 750) also has a generally elliptical shape when viewed in the xy plane.

[0097] Specifically, the folded-back portion 300 may have rounded corners so as to prevent the user from cutting his or her hands.

[0098] The shape of the first folded portion 300 (the shape of the front surface through-hole 750) is not limited as long as it can pass through the back surface through-hole 700 and allow the first holding portion 320 to be inserted into the first held portion 500 and fixed.

[0099] When first folded portion 300 is not folded back at first folding line 310, first holding portion 320 is disposed below first folded portion 300 (on the negative y-axis direction side).

[0100] In this embodiment, when not folded back at the first fold line 310, the first retaining portion 320 has a protruding shape that protrudes downward at the horizontal (x-axis) center on the lower side (negative y-axis side).

[0101] The back surface through-hole 700 is formed in the back surface portion 220 and is arranged at the same position as the first folded portion 300 in the xy plan view, and is arranged in the back surface portion 220 so that the first folded portion 300 can pass through the back surface through-hole 700.

[0102] Specifically, the back surface through hole 700 is slightly larger than the first folded portion 300, and is configured so that when the first folded portion 300 rotates toward the back surface portion 220 around the first folded line 310 as an axis, the first folded portion 300 can easily pass through the back surface through hole 700.

[0103] In this embodiment, the rear surface through-hole 700 has a generally elliptical shape when viewed in an xy plane.

[0104] In this embodiment, the first held portion 500 is positioned above (on the positive y-axis side) the back surface through-hole 700 provided in the back surface portion 220, and is the portion into which the first holding portion 320 is inserted when the first folded portion 300 is folded back to the back surface side (on the negative z-axis side).

[0105] By inserting the first holding portion 320 into the first held portion 500, the first folded portion 300 folded back to the back surface side (z-axis negative direction side) is fixed and held in a detachable state.

[0106] This makes it difficult for the first folded portion 300 to open, and the user can easily hold the paper bag 100 by passing a finger or hand through the front through-hole 750 and the back through-hole 700.

[0107] In addition, by folding back first fold portion 300, the strength of the handle is improved, and since first fold line 310 comes into contact with the user's fingers or hand, the user can be effectively prevented from being injured by the paper.

[0108] In addition, the first holding portion 320 and the first held portion 500 may not be provided.

[0109] Even in such a case, the strength of the handle portion is improved by folding back first fold portion 300, and since first fold line 310 comes into contact with the user's fingers or hand, the user can be effectively prevented from being injured by the paper.

[0110] The fold line 600 is a mountain fold line in this embodiment, and has a front fold line 650 and a back fold line 660 .

[0111] The fold line 600 does not have to be a mountain fold line, but may be any line that makes it easy for a user to fold.

[0112] The surface fold line 650 includes a surface under curve 651 provided on the surface underside (y-axis negative direction side), A left surface curve 652 provided on the left side of the surface (the negative x-axis direction side); and a right surface curve 653 provided on the right side of the surface (the positive x-axis direction side).

[0113] The subsurface curve 651 is provided on the underside of the surface portion 210, and in this embodiment is a parabolic curved fold line.

[0114] Specifically, the subsurface curve 651 is a parabolic curve that extends from the lower left corner to the lower right corner of the surface portion 210 and is highest at the center in the horizontal direction (x-axis direction).

[0115] The left surface curve 652 is provided on the left side of the surface portion 210, and in this embodiment is a parabolic curved fold line.

[0116] Specifically, the left surface curve 652 is a parabolic curve extending from the upper left side of the surface portion 210 to the lower left corner.

[0117] The right surface curved line 653 is provided on the right side of the surface portion 210, and in this embodiment is a parabolic curved fold line.

[0118] Specifically, the surface right curve 653 is a parabolic curve extending from the upper right side of the surface portion 210 to the lower right corner.

[0119] The back folding line 660 includes a back lower curved line 661 provided on the bottom side of the back surface (the negative y-axis direction side), A lower connection curve 662 provided on the surface lower connection portion 211 that is folded back and connected to the back surface side; A back surface left curved line 663 provided on the back surface left side (x-axis positive direction side); A back surface right curve 664 provided on the back surface right side (x-axis negative direction side); and a lateral connection portion curve 665 provided at the front side lateral connection portion 212 that is folded back from the left side of the front side to the back side.

[0120] The rear surface lower curved line 661 is provided on the lower side of the rear surface portion 220, and in this embodiment is a parabolic curved fold line.

[0121] Specifically, the back surface lower curve 661 is provided from the lower left corner to the lower right corner of the back surface portion 220, and is a parabolic curve that is highest at the center in the horizontal direction (x-axis direction).

[0122] The lower connection portion curved line 662 is provided on the front surface lower connection portion 211 and is a fold line that overlaps with the back surface lower curved line 661 .

[0123] The back left curved line 663 is provided on the left side of the back surface portion 220, and in this embodiment is a parabolic curved fold line.

[0124] Specifically, the rear left curved line 663 is a parabolic curve extending from the upper left side of the rear surface portion 220 to the lower left corner.

[0125] The back right curved line 664 is provided on the right side of the back surface portion 220, and in this embodiment is a parabolic curved fold line. Specifically, the back surface right curve 664 is a parabolic curve extending from the upper right side of the back surface portion 220 to the lower right corner.

[0126] The horizontal connection portion curved line 665 is provided on the front side horizontal connection portion 212 and is a fold line that overlaps with the back side right curved line 664 .

[0127] By folding along these fold lines, the bag body portion 200 can be three-dimensionally deformed.

[0128] <Fourth embodiment> As shown in FIG. 17, the fourth embodiment has a configuration only with the lower fold line of the third embodiment.

[0129] Specifically, the bag body 200 in the fourth embodiment does not have the front left curved line 652, the front right curved line 653, the back left curved line 663, the back right curved line 664, and the horizontal connection curved line 665.

[0130] Even with this configuration, the bag body 200 can be three-dimensionally deformed.

[0131] <Fifth embodiment> As shown in FIG. 18, the fifth embodiment has a configuration in which only the lateral folding lines of the third embodiment are included.

[0132] Specifically, the bag body portion 200 in the fifth embodiment does not have a top surface lower curved line 651, a bottom surface lower curved line 661, and a bottom connection curved line 662.

[0133] Even with this configuration, the bag body 200 can be three-dimensionally deformed.

[0134] Sixth embodiment As shown in FIG. 19, the second folded portion 800 according to the second embodiment is formed from a part of the front surface portion 210, and includes a second folded line 810 that is a folded line disposed at the top, and a second holding portion 820 which is a holding portion held by a second held portion 850 which is a held portion.

[0135] The second folded portion 800 can be folded back about the second folding line 810 as an axis and passed through the left through-hole 400 .

[0136] The shape of the second folded portion 800 , except for the second holding portion 820 , is smaller than the left through-hole 400 , and the second folded portion 800 is configured to easily pass through the left through-hole 400 .

[0137] In this embodiment, the left through-hole 400 has a generally elliptical shape when viewed in the xy plane, and the shape of the second folded portion 800 is half the generally elliptical shape (semi-elliptical shape) when viewed in the xy plane.

[0138] The shape of the second folded portion 800 is not limited as long as it can be passed through the left through-hole 400 and the second holding portion 820 can be inserted into the second held portion 850 and fixed.

[0139] When the second folded portion 800 is not folded back at the second folding line 810, the second holding portion 820 is disposed below the second folded portion 800 (on the negative y-axis direction side).

[0140] In this embodiment, when not folded back at the second folding line 810, the second holding portion 820 has a protruding shape that protrudes downward (toward the negative y-axis direction).

[0141] In this embodiment, the second held portion 850 is positioned above (on the positive y-axis side of) the left-side through hole 400 provided in the back surface portion 220, and is the portion into which the second holding portion 820 is inserted when the second folded portion 800 is folded back to the back surface side.

[0142] By inserting the second holding portion 820 into the second held portion 850, the second folded portion 800 folded back to the back side is fixed and held in a detachable state.

[0143] This makes it difficult for the second folded portion 800 to open, and the user can easily hold the paper bag 100 by passing his / her fingers or hands through the right through-hole 330 and the left through-hole 400.

[0144] In addition, by folding back the second fold portion 800, the strength of the handle portion is improved, and since the second fold line 810 comes into contact with the user's fingers or hand, the user can be effectively prevented from being injured by the paper.

[0145] It should be noted that this embodiment is applicable not only to the second embodiment but also to the third to fifth embodiments.

[0146] Seventh embodiment In the seventh embodiment, the folded portion is semi-elliptical, and there are two holding portions and two held portions. Descriptions of the same configuration as those described above will be omitted or will be given in a simplified manner.

[0147] As shown in FIG. 20, the third folded portion 900, which is a folded portion according to the seventh embodiment, is configured from a part of the front surface portion 210, and includes a third folded line 910, which is a folded line disposed at the upper portion, and a third holding portion 920 which is a holding portion held by a third held portion 950 which is a held portion.

[0148] The third folded portion 900 can be folded back about the third folding line 910 as an axis and passed through the left through-hole 400 .

[0149] The shape of the third folded portion 900 , except for the third holding portion 920 , is smaller than the left side through-hole 400 , and the third folded portion 900 is structured to easily pass through the left side through-hole 400 .

[0150] In this embodiment, the left through-hole 400 has a generally elliptical shape when viewed from above, and the third folded portion 900 has a shape that is half of a generally elliptical shape (semi-elliptical shape) when viewed from the xy plane.

[0151] The shape of the third folded portion 900 is not limited as long as it can be passed through the left through-hole 400 and the third holding portion 920 can be inserted into the third held portion 950 and fixed.

[0152] The third holding portion 920 is arranged at both the left and right ends of the third folded portion 900, and is arranged below the third folded portion 900 when the third folded portion 900 is not folded at the third fold line 910.

[0153] Specifically, the third holding portion 920 has a left third holding portion 921 and a right third holding portion 922.

[0154] The left third holding portion 921 is disposed below the end portion on the left side (the z-axis positive direction side) of the third folded portion 900.

[0155] The right third holding portion 922 is disposed below the end portion on the right side (the negative z-axis direction side) of the third folded portion 900.

[0156] In this embodiment, the third retained portion 950 is positioned above (on the positive y-axis side) the left-side through hole 400 provided in the back surface portion 220, and is the portion into which the third retaining portion 920 is inserted when the third folded portion 900 is folded back to the back surface side.

[0157] Specifically, the third held portion 950 has a left third held portion 951 and a right third held portion 952 .

[0158] The left third held portion 951 is disposed on the left side (x-axis positive direction side), and the right third held portion 952 is disposed on the right side.

[0159] The third held portion 950 is disposed at a position where the third holding portion 920 can be inserted, and in this embodiment, has an inverted V shape that widens downward (in the negative y-axis direction).

[0160] By inserting the third holding portion 920 into the third held portion 950, the third folded portion 900 folded back to the rear side is fixed in a detachable state.

[0161] This makes it difficult for the third folded portion 900 to open, and the user can easily hold the paper bag 100 by passing his / her fingers or hands through the right through-hole 330 and the left through-hole 400.

[0162] In addition, by folding back the third fold portion 900, the strength of the handle portion is improved, and since the third fold line 910 comes into contact with the user's fingers or hand, the user can be effectively prevented from being injured by the paper.

[0163] It should be noted that this embodiment is applicable not only to the second embodiment but also to the third to fifth embodiments.

[0164] Eighth embodiment In the eighth embodiment, the folded portion is elliptical, and there are two holding portions and two held portions. Descriptions of the same configuration as those described above will be omitted or will be simplified.

[0165] As shown in FIG. 21, the fourth folded portion 1000 according to the eighth embodiment is formed from a part of the front surface portion 210, and includes a fourth folded line 1010 that is a folded line disposed at the top, and a fourth holding portion 1020 which is a holding portion to be inserted into a fourth held portion 1050 which is a held portion.

[0166] The fourth folded portion 1000 can be folded back about the fourth folding line 1010 as an axis and passed through the left through-hole 400 .

[0167] The shape of the fourth folded portion 1000 is smaller than the left through-hole 400 except for the fourth holding portion 1020, and the fourth folded portion 1000 is structured to easily pass through the left through-hole 400.

[0168] In this embodiment, the left through-hole 400 has a generally elliptical shape in plan view, and the shape of the fourth folded portion 1000 also has a generally elliptical shape in plan view.

[0169] The shape of the fourth folded portion 1000 is not limited as long as it can be passed through the left through-hole 400 and the fourth holding portion 1020 can be inserted into the fourth held portion 1050 and fixed.

[0170] The fourth holding portions 1020 are disposed on both the left and right ends of the fourth folded portion 1000 .

[0171] Specifically, the fourth holding portion 1020 has a left fourth holding portion 821 and a right fourth holding portion 822.

[0172] The left fourth holding portion 821 is disposed at the left end of the fourth folded portion 1000, and has an arcuate shape.

[0173] The right fourth holding portion 822 is disposed at the right end of the fourth folded portion 1000, and has an arcuate shape.

[0174] In this embodiment, the fourth held portion 1050 is positioned above (on the positive y-axis side of) the left-side through hole 400 provided in the back surface portion 220, and is the portion into which the fourth holding portion 1020 is inserted when the fourth folded portion 1000 is folded back to the back surface side.

[0175] Specifically, the fourth held portion 1050 has a left fourth held portion 1051 and a right fourth held portion 1052 .

[0176] The left fourth held portion 1051 is disposed on the left side, and the right fourth held portion 1052 is disposed on the right side.

[0177] The fourth held portion 1050 is disposed at a position where it can be held by the fourth holding portion 1020, and in this embodiment, has an arc shape.

[0178] By inserting (holding) the fourth holding portion 1020 into (holding) the fourth held portion 1050, the fourth folded portion 1000 folded back to the back side is fixed in a detachable state.

[0179] This makes it difficult for the fourth folded portion 1000 to open, and the user can easily hold the paper bag 100 by passing his / her fingers or hands through the right through-hole 330 and the left through-hole 400.

[0180] In addition, by folding back the fourth fold portion 1000, the strength of the handle portion is improved, and since the fourth fold line 1010 comes into contact with the user's fingers or hand, the user can be effectively prevented from being injured by the paper.

[0181] It should be noted that this embodiment is applicable not only to the second embodiment but also to the third to fifth embodiments.

[0182] <Ninth embodiment> The ninth embodiment has a configuration in which one upper folded portion 1100 is provided. Descriptions of configurations similar to those described above will be omitted or will be given in a simplified manner.

[0183] As shown in FIG. 22, in this embodiment, an upper folded portion 1110 on the front surface is provided as the upper folded portion 1100.

[0184] The top surface folded portion 1110 has a top surface folded portion through-hole 1111 , a top surface folded line 1112 , and a fifth held portion 1113 .

[0185] 22 is a development view of the paper bag 100 according to this embodiment. As can be seen from FIG. 22, a front upper folded portion 1110 is provided on the upper side of the front surface portion 210.

[0186] The upper front surface folded portion 1110 is folded back to the rear surface side (z-axis negative direction side) about a front surface folding line 1112 as an axis.

[0187] The top front surface folded portion through-hole 1111 is a through-hole that is slightly larger than the second back surface through-hole 410, which is a back surface through-hole.

[0188] When the front surface upper folded portion 1110 is folded back, the upper edge (positive y-axis side) of the front surface upper folded portion through hole 1111 is configured to coincide or nearly coincide with the upper edge (positive y-axis side) of the second back surface through hole 410.

[0189] This reinforces the strength of the through hole in the handle portion through which the user inserts his / her fingers.

[0190] In this embodiment, the second back surface through hole 410 has a shape similar to but slightly larger than the shape of the first folded portion 300, and when the first folded portion 300 is folded back, the second back surface through hole 410 can pass through the first folded portion 300.

[0191] In a state where the front upper folded portion 1110 is folded back about the front folding line 1112 as an axis, the front upper folded portion through-hole 1111 and the second back surface through-hole 410 overlap with each other.

[0192] Further, the first held portion 500 and the fifth held portion 1113 also overlap at the same or almost the same position. In this embodiment, the first held portion 500 may be omitted.

[0193] When the first folded portion 300 is folded back toward the back surface portion 220 around the first fold line 310, the first folded portion 300 passes through the second back surface through hole 410 and the front surface upper folded portion through hole 1111 and is inserted into the fifth held portion 1113.

[0194] Specifically, the first holding portion 320 of the first folded portion 300 is inserted into the fifth held portion 1113 and fixed.

[0195] The first holding portion 320 may be inserted into the fifth held portion 1113 and the first held portion 500.

[0196] Also, the first holding portion 320, the fifth held portion 1113, and the first held portion 500 may not be included.

[0197] The front upper folded portion 1110 functions as a lid for the paper bag 100 when folded back to the outside of the back surface portion 220 (outside of the bag body portion 200).

[0198] The upper front surface folded portion 1110 may be configured not to have the upper front surface folded portion through-hole 1111 (the upper front surface folded portion 1110 may have a narrow width in the y-axis direction (vertical direction)).

[0199] Even in such a case, the strength of the handle portion is improved by folding back first fold portion 300, and since first fold line 310 comes into contact with the user's fingers or hand, the user can be effectively prevented from being injured by the paper.

[0200] Next, a configuration in which the front upper folded portion 1110 is folded inside the bag main body portion 200, rather than outside the bag main body portion 200 (the negative z-axis direction side of the back surface portion 220), will be described.

[0201] The upper surface folded portion 1110 may be folded back to the inside of the bag body portion 200 .

[0202] In this case, there is no need to provide the fifth held portion 1113. In other words, the first holding portion 320 of the first folded portion 300 is held by the first held portion 500 of the back surface portion 220.

[0203] Therefore, the front upper folded portion 1110 can be folded either to the outside or to the inside of the bag body portion 200. Note that the front upper folded portion 1110 may be configured to be folded only to either the outside or the inside of the bag body portion 200.

[0204] By folding back the upper surface fold 1110, the handle portion becomes thicker (the thickness increases in the z-axis direction), improving the strength of the handle portion. Also, since the first fold line 310 comes into contact with the user's fingers or hand, it is possible to effectively prevent the user from being injured by the paper.

[0205] In this embodiment, a configuration has been described in which the upper folded portion 1100 is provided in one location, and the location has been described as being provided only on the upper side of the front side portion 210, but it may also be provided only on the upper side of the back side portion 220.

[0206] Furthermore, although this embodiment is described as a modified example of the third embodiment, it can also be used in the fourth and fifth embodiments.

[0207] Tenth embodiment The tenth embodiment has a configuration in which two upper folded-back portions 1100 are provided. Descriptions of configurations similar to those described above will be omitted or will be given in a simplified manner.

[0208] As shown in FIG. 23, in this embodiment, an upper folded portion 1100 is provided with a front upper folded portion 1110 and a back upper folded portion 1120.

[0209] The back surface upper folded portion 1120 has the same configuration as the front surface upper folded portion 1110 .

[0210] The upper surface folded portion 1110 has an upper surface folded portion through-hole 1111 and a surface folded line 1112 .

[0211] Similar to the front-side upper folded portion 1110, the back-side upper folded portion 1120 has a back-side upper folded portion through-hole 1121 and a back-side folded line 1122.

[0212] The front upper folded portion 1110 and the back upper folded portion 1120 are folded back to the inside of the bag body portion 200.

[0213] Specifically, the front upper folded portion 1110 is folded back toward the inside of the bag body portion 200 with the front folding line 1112 as an axis.

[0214] Similarly, the back upper fold portion 1120 is folded back to the inside of the bag body portion 200 with the back fold line 1122 as an axis.

[0215] The through-hole 1111 in the upper folded portion of the front surface and the through-hole 1121 in the upper folded portion of the back surface overlap with each other.

[0216] In other words, when the front surface upper folded portion 1110 and the back surface upper folded portion 1120 are folded back, the upper edge (positive y-axis side) of the front surface upper folded portion through hole 1111 and the back surface upper folded portion through hole 1121 are configured to coincide or nearly coincide with the upper edge (positive y-axis side) of the second back surface through hole 410.

[0217] This reinforces the strength of the through hole in the handle portion through which the user inserts his / her fingers.

[0218] Therefore, when the first folded portion 300 is folded back toward the back surface portion 220 around the first fold line 310, the first folded portion 300 passes through the front surface upper folded portion through hole 1111, the back surface upper folded portion through hole 1121, and the second back surface through hole 410, and is folded back toward the back surface portion 220.

[0219] Then, the first holding portion 320 of the first folded portion 300 is inserted into the first held portion 500 .

[0220] By folding the front upper fold portion 1110 and the back upper fold portion 1120 inwardly into the bag main body portion 200, the handle portion becomes thicker (the thickness in the z-axis direction increases), improving the strength of the handle portion.In addition, since the first fold line 310 comes into contact with the user's fingers or hand, it is possible to effectively prevent the user from being injured by the paper.

[0221] Although this embodiment is described as a modified example of the third embodiment, it can also be used in the fourth and fifth embodiments.

[0222] The present invention can be implemented in various forms with improvements, modifications, or variations without departing from the spirit of the invention.

[0223] For example, the front surface portion 210 and the back surface portion 220 may have the reversed configuration (such that the back surface portion 220 has a folded portion and the front surface portion 210 has a held portion). [Explanation of symbols]

[0224] 100…Paper bag 200…Bag body 210...Surface part 211…underside surface connection 212…Surface side connection part 220...back side 221...Left back section 222...Right back section 230...End 231...Left end 232...Right end 240…Back side connection part 300…First turn-up section 310…First turnaround line 320...First holding part 400...Left side through hole 410...Second rear through hole 500...First held part 600…Fold line 610…First surface fold line 620…First fold line on the back 630…Second surface fold line 640…Second back fold line 700…Through hole on the back 800…Second turn-up part 810…2nd turnaround line 820…Second holding part 850…Second held part 900…Third turn-around section 1000…4th turn 1100…Upper folded part 1110…Top folded part of surface 1120…Back upper folded part

Claims

1. A paper bag that is closed at the sides and bottom and open at the top, A bag body portion having an opening at the top; A left through hole provided on the left side of the bag body portion through which a user can pass a finger or hand; a folded-back portion disposed on the right side of the bag body portion, passing through the left-side through hole and folded back above the left-side through hole on the left side; A fold line for three-dimensionally deforming the bag body portion, The folded-back portion passes through the left-side through hole and is folded back to the left, thereby providing a right-side through hole on the right side, The paper bag has a body portion that can be deformed three-dimensionally by folding along the fold line.

2. The bag body portion has a front surface portion on a front side and a back surface portion on a back side, The fold line has a front fold line and a back fold line, The surface fold line includes a surface center line provided vertically at the center of the upper surface, a left oblique line extending from a lower portion of the front center line toward a left bottom portion of the front portion; a right oblique line extending from a lower portion of the front center line toward a right bottom portion of the front portion; The back folding line includes a back center line provided vertically at the center of the upper part of the back surface, a back left diagonal line extending from a lower portion of the back center line toward a left bottom portion of the back portion; 2. The paper bag according to claim 1, further comprising a right oblique line extending from a lower portion of the back center line toward a right bottom portion of the back portion.

3. The bag body portion has a front surface portion on a front side and a back surface portion on a back side, The fold line has a front fold line and a back fold line, The surface fold line is a surface left diagonal line provided from the upper end center of the surface portion to the left bottom of the surface portion; a right oblique line extending from the upper center of the surface portion toward the right bottom of the surface portion; The back folding line is a back left oblique line provided from the upper end center of the back portion to the left bottom portion of the back portion; The paper bag according to claim 1, further comprising a right oblique line extending from the upper center of the back surface toward the right bottom of the back surface.

4. A paper bag that is closed at the sides and bottom and open at the top, A bag body portion having an opening at the top; A rear through hole provided on the rear side of the bag body through which a user can pass a finger or hand; A folded-back portion is disposed on the front surface side of the bag body portion, passes through the rear surface through hole, and is folded back above the rear surface through hole on the rear surface side; A fold line for three-dimensionally deforming the bag body portion, The folded portion passes through the rear surface through hole and is folded back to the rear surface side, thereby providing a front surface through hole on the front surface side, The paper bag has a body portion that can be deformed three-dimensionally by folding along the fold line.

5. The bag body portion has a front surface portion on a front side and a back surface portion on a back side, The fold line has a front fold line and a back fold line, The surface fold line is a parabolic subsurface curve provided on the underside of the surface portion; a left parabolic surface curve provided on the left side of the surface portion; a right parabolic surface curve provided on the right side of the surface portion, The back fold line is a parabolic back lower curve provided on the lower side of the back portion; a parabolic back surface left curve provided on the left side of the back surface portion; 5. The paper bag according to claim 4, further comprising a parabolic right back curve provided on the right side of the back portion.

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