Paper bag

Abstract

To provide a paper bag that can also be used as an article storage box.SOLUTION: A paper bag 100 is a foldable paper bag having a bottom portion 1, a front portion 2 and a back portion 3 connected to a front edge and a rear edge of the bottom portion 1, and right and left side portions 4 connected to right and left edges of the bottom portion 1, respectively, and foldable inward or outward, and has an opening 20 at a top, the paper bag including: a side reinforcing plate 61 detachably arranged along an inner surface of the side portion 4 with the opening 20 widened; and a reinforcing plate holding portion 7 provided on the side portion 4 to hold an upper portion of the side reinforcing plate 61.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Conventionally, gusseted paper bags have been used when delivering catalogs, company guides, etc. to customers, when carrying products home, etc. (See, for example, Patent Document 1.) Such foldable paper bags are widely used as simple containers for transporting items.

[0003] The reality is that paper bags are used solely for transportation purposes and are often discarded without being reused. As such, there is room for improvement in the fact that conventional paper bags are often used as disposable bags. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Microfilm of Utility Model Application No. 61-125919 (Utility Model Application No. 63-032148) Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made to improve this situation, and has as its object to provide a paper bag that can also be used as an item storage box. [Means for solving the problem]

[0006] The paper bag of the present invention is a foldable paper bag having a bottom portion, a front portion and a back portion connected to the front edge and rear edge of the bottom portion, and left and right side portions connected to the left and right edges of the bottom portion, respectively, and which can be folded inward or outward, and which has an opening at the top, and is also equipped with a side reinforcing plate that is removably arranged along the inner surface of the side portion when the opening is unfolded, and a reinforcing plate holding portion provided on the side portion that holds the upper part of the side reinforcing plate.

[0007] The paper bag of the present invention has detachable side reinforcing plates on the side sections, which allow the side sections to be folded for compact storage when the side reinforcing plates are not in place, while when the side reinforcing plates are in place along the side sections, the bag can be reused as an item storage box with the side sections prevented from folding. This allows for the provision of an environmentally friendly paper bag.

[0008] The paper bag of the present invention may have folded-in upper portions of the front, back, and side portions, respectively, and the reinforcing plate holder may be configured to insert and hold the upper portion of the side reinforcing plate between the folded-in portions of the side portions and the inner surfaces of the side portions.

[0009] According to this aspect, the opening can be reinforced by the folded portion, and the reinforcing plate holding portion can be formed with a simple configuration, thereby suppressing increases in manufacturing costs and forming a reinforcing plate holding portion that is not visible on the outside of the paper bag, thereby preventing deterioration of the appearance of the paper bag.

[0010] The paper bag of the present invention may further include a bottom reinforcing plate detachably disposed along the inner surface of the bottom portion, and the lower ends of the side reinforcing plates may be connected to the left and right edges of the bottom reinforcing plate.

[0011] According to this aspect, the bottom reinforcement plate is positioned along the inner surface of the bottom portion, and the upper part of the side reinforcement plate is held by the reinforcement plate holding portion, thereby restricting the left-right movement of the lower end of the side reinforcement plate, thereby reliably preventing the side reinforcement plate from coming off the side portion.

[0012] Furthermore, the side reinforcement plate and the bottom reinforcement plate may be formed from paper, and the connecting portion between the side reinforcement plate and the bottom reinforcement plate may be folded so that the side reinforcement plate and the bottom reinforcement plate can be stored in a stacked state along the inner surface of the bottom portion.

[0013] According to this aspect, the side reinforcing plate and the bottom reinforcing plate can be stored in an overlapping state on the bottom of the paper bag, and the side reinforcing plate can be used together with the bottom reinforcing plate as a reinforcing member for the bottom.

[0014] In addition, the paper bag of the present invention may be configured to have handle holes provided at the upper parts of the front and back parts, and a tongue piece that is separated from the front or back part by an upward-opening, approximately C-shaped or approximately U-shaped cutting line that is connected to the upper edge of the handle hole and can be folded back upward.

[0015] According to this aspect, by allowing the tongue to be folded back upward without being completely cut out of the handle hole, the strength of the upper edge of the handle hole can be maintained using only the paper. Furthermore, the thickness of the upper edge of the handle hole can be ensured, preventing the bag from digging into the user's hand. Furthermore, when using the paper bag as an item storage box, the tongue can be folded back to cover the handle hole, allowing documents and other items stored inside the item storage box to be hidden. [Effects of the Invention]

[0016] The paper bag of the present invention can also be used as an item storage box by attaching a detachable side reinforcing plate to the side portion. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view showing a state in which the embodiment is used as an item storage box. [Figure 2] 1A is a front view of the same embodiment, and FIG. 1B is a right side view thereof. [Figure 3] FIG. 2 is a plan view showing a development of the bag body of the embodiment. [Figure 4]1A is a plan view showing a reinforcing plate member, and FIG. 1B is an enlarged view of an assembly illustration. [Figure 5] FIG. 2 is a perspective view showing the embodiment in a folded state. [Figure 6] 2(B) is a longitudinal cross-sectional view of the side portion taken along the line AA in FIG. 2(B), where (A) shows a state in which the reinforcing plate holding portion is not holding a side reinforcing plate, (B) shows a state in which the reinforcing plate holding portion is holding a side reinforcing plate, and (C) shows a state in which the reinforcing plate holding portion of another embodiment is holding a side reinforcing plate. [Figure 7] 2A is a longitudinal cross-sectional view taken along the line BB in FIG. 2A, and FIG. 2B is a longitudinal cross-sectional view showing an example of a state when the device is carried. [Figure 8] FIG. 2 is a perspective view showing the state when the embodiment is used as a paper bag. [Figure 9] 10 is a vertical cross-sectional view showing an example of the state of the handle hole when the embodiment is used as a paper bag. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] Next, an embodiment of the present invention will be described with reference to the drawings. In the following description, the terms "front and rear" and "left and right" are used to specify directions. These terms refer to the direction in which the long sides of the bottom of the paper bag extend, and the direction perpendicular to the left and right directions in a horizontal plane. Note that these terms are used for convenience of explanation and do not limit the technical scope of the present invention.

[0019] As shown in Figures 1 to 9, the paper bag 100 of this embodiment is a foldable paper bag with an opening 20 at the top, and includes a bag body 10 having a bottom portion 1, a front portion 2 and a back portion 3 connected to the front and back edges of the bottom portion 1, and a pair of left and right side portions 4 connected to the left and right edges of the bottom portion 1. The bottom portion 1, front portion 2, back portion 3, and side portions 4 are each formed in a substantially rectangular shape.

[0020] Each side portion 4 functions as a gusset and, in this embodiment, is provided so that it can be folded inward along a folding line 42 extending in the vertical direction. A handle hole 8 is provided at the top of each of the front portion 2 and the back portion 3. A tongue piece 9 is connected to the upper edge of the handle hole 8.

[0021] Inside the bag body 10, a storage space is formed surrounded by a bottom portion 1, a front portion 2, a back portion 3, and left and right side portions 4. An opening 20 is provided on the top surface of the bag body 10, and contents can be put in and taken out of the inside of the bag body 10 through the opening 20.

[0022] The paper bag 100 is provided with a side reinforcing plate 61 that is detachably arranged along the inner surface of the side portion 4 when the opening 20 of the bag body 10 is open, and that prevents the side portion 4 from folding along the folding line 42. The paper bag 100 also has a reinforcing plate holding portion 7 that is provided on the side portion 4 of the opening 20 and holds the upper portion of the side reinforcing plate 61.

[0023] In the paper bag 100 of this embodiment, the side reinforcing plate 61 is detachably provided on the side portion 4, so that the side portion 4 can be folded and stored compactly when the side reinforcing plate 61 is not arranged on the side portion 4. On the other hand, when the side reinforcing plate 61 is arranged along the side portion 4, the paper bag 100 can be reused as an item storage box that prevents the side portion 4 from folding. This makes it possible to provide an environmentally friendly paper bag 100.

[0024] Next, the paper bag 100 will be described in detail. As shown in the developed view of Figure 3, the bag body 10 is formed from a single sheet of cardboard, such as art post paper. The left and right edges of the front portion 2 are connected to the front edges of each side portion 4, and the left and right edges of the back portion 3 are connected to the rear edges of each side portion 4 by folds 50 and 51, respectively. Similarly, the front edge of the bottom portion 1 is connected to the lower edge of the front portion 2, the rear edge of the bottom portion 1 is connected to the lower edge of the back portion 3, and the left and right edges of the bottom portion 1 are connected to the lower edges of each side portion 4 by folds 52, 53, and 54, respectively.

[0025] The bag body 10 has a front folded portion 21, a back folded portion 31, and a side folded portion 41 that are folded inward along a crease 57 at the upper edges of the front portion 2, the back portion 3, and the side portion 4, respectively. The inner periphery of the opening 20 of the bag body 10 is surrounded by the folded portions 21, 31, and 41. The fold line 42 of the side portion 4 is also formed on the side folded portion 41. In addition, a substantially rectangular glue tab 60 (see Figure 3) that adheres to the inner surface of the back portion 3 during assembly is connected via a crease 51 to the side portion 4 and side folded portion 41 on the right side when viewed from the front.

[0026] The bottom portion 1 forming the bottom of the bag body 10 has a substantially trapezoidal front bottom piece 12 and a substantially trapezoidal back bottom piece 13 connected to the lower edges of the front portion 2 and the back portion 3 via folds 52 and 53, respectively, and substantially trapezoidal side bottom pieces 14 connected to the lower edges of the left and right side portions 4 via folds 54. The bottom pieces 12, 13, and 14 are bonded together during assembly to form the substantially rectangular bottom portion 1.

[0027] The width W of the front portion 2 and the back portion 3 is set to be the same dimension, or the width W of the back portion 3 is set to be slightly smaller than the width W of the front portion 2, taking into account the adhesion between the glue tab 60 and the back portion 3. The width W of the folded portions 21, 31 is set to be the same dimension as the width W of the front portion 2 and the back portion 3. The gusset width D of the left and right side portions 4 is set to be the same dimension, smaller than the width W. The gusset width D of the side folded portions 41 is set to be the same dimension as the gusset width D of the side portion 4. The size of the bottom portion 1 is a rectangle with a width W and a gusset width D.

[0028] The height H1 of the front portion 2, the back portion 3, and the side portion 4 is set to be the same dimension. The height H2 of the folded portions 21, 31, and 41 is set to be smaller than the height H1. In this embodiment, the height H2 is set to be, for example, about 1 / 3 of the height H1.

[0029] In this embodiment, the dimensions of the bag body 10 are, for example, a width W of about 340 mm, a gusset width D of about 80 mm, and a height H1 of about 300 mm. However, these dimensions can be changed as appropriate.

[0030] As shown in Figures 1 to 3 and 7, the bag body 10 has a reinforcing plate holding portion 7 provided in the side fold portion 41 of the side portion 4. In this embodiment, the reinforcing plate holding portion 7 is configured as a slit-shaped elongated hole formed in a region near the lower edge of the side fold portion 41, parallel to and spaced from the lower edge of the side fold portion 41. The length of the elongated hole forming the reinforcing plate holding portion 7 is set to be the same dimension as the gusset width D or slightly longer than the gusset width D, and the elongated hole of the reinforcing plate holding portion 7 is formed from the fold line 50 across the folding line 42 to the fold line 51.

[0031] As shown in Figure 6(A), the reinforcing plate holding portion 7 provided in the side folded portion 41 is exposed to the inside of the bag body 10, but is not visible on the outside of the bag body 10. In other words, in the paper bag 100 of this embodiment, the reinforcing plate holding portion 7 does not detract from the appearance of the bag body 10.

[0032] As shown in Figure 3 and other figures, a straight folding line 55 is provided at the bottom of the back portion 3, parallel to the fold 53. The folding line 55 extends to the bottom of the left and right side portions 4. An inverted V-shaped folding line 56 is formed on each of the left and right side portions 4, connecting the intersection of the folding lines 42, 55 and both ends of the fold 54.

[0033] As shown in Figure 5, the bag body 10 can have the side portions 4 folded inward along the folding lines 42, 55, and 56. By folding the side portions 4 inward, the front portion 2 and the back portion 3 approach each other, and the bottom portion 1 and the back portion 3 become approximately parallel, thereby folding the bag body 10.

[0034] The bag body 10 may be formed by joining multiple sheets of cardboard together with glue, etc. The material of the bag body 10 is not limited to art post paper, and may be any paper material used for paper bags, such as coated paper or bleached kraft paper.

[0035] As shown in Figure 1 etc., the paper bag 100 is equipped with a reinforcing plate member 6 having a pair of left and right side reinforcing plates 61 arranged along the inner surface of the side portion 4, and a bottom reinforcing plate 62 arranged along the inner surface of the bottom portion 1. The reinforcing plate member 6 is formed from a paper material separate from the bag body 10, for example, from cardboard that is thicker than the bag body 10. The material of the reinforcing plate member 6 is not particularly limited, but for example, thick coated paper can be used.

[0036] 4, the bottom reinforcing plate 62 is slightly smaller than the bottom portion 1 and has a generally rectangular shape that is long in the left-right direction. The side reinforcing plates 61 are connected to the left and right edges of the bottom reinforcing plate 62 and have a generally rectangular shape that extends in the longitudinal direction of the bottom reinforcing plate 62. The tip of the side reinforcing plate 61 has a convex shape with rounded corners.

[0037] The depth Ds of the reinforcing plates 61, 62 is slightly smaller than the gusset width D of the bag body 10 (for example, a dimension smaller by several millimeters than the gusset width D). In addition, the width Wb of the bottom reinforcing plate 62 is slightly smaller than the width W of the bag body 10 (for example, a dimension smaller by about 7 to 9 mm than the width W).

[0038] The length Ws of the side reinforcing plate 61 is set to a dimension smaller than the height H1 of the bag body 10 and smaller than the width Wb of the bottom reinforcing plate 62. In this embodiment, the length Ws of the side reinforcing plate 61 is set to a dimension slightly longer than the distance between the fold 54 on the lower edge of the side portion 4 and the reinforcing plate holding portion 7 when the bag body 10 is assembled (when the folded-back portions 21, 31, 41 are folded back).

[0039] The side reinforcing plates 61 and the bottom reinforcing plate 62 are connected by connecting portions 63 formed by folds. As shown in Fig. 8, the reinforcing plate member 6 is provided so as to be foldable in three so that the left and right side reinforcing plates 61 and the bottom reinforcing plate 62 overlap each other. The reinforcing plate member 6 is configured so that it can be stored in the bag body 10 along the inner surface of the bottom portion 1 with the connecting portions 63 folded to overlap the side reinforcing plates 61 and the bottom reinforcing plate 62.

[0040] The reinforcing plate member 6 in the folded state is placed on the bottom surface 1 of the bag body 10 and can be used as the bottom plate of the paper bag 100. As shown in Figure 5, the bag body 10 is configured so that the bag body 10 can be folded with the reinforcing plate member 6 in the folded state stored in the bottom surface 1.

[0041] As shown in Fig. 4, the reinforcing plate member 6 has an illustration 64 that shows the assembly procedure when using the paper bag 100 as an item storage box. As shown in Fig. 4(B), the illustration 64 has an illustration drawn on it that shows the procedure for holding the side reinforcing plate 61 in the reinforcing plate holding portion 7. The illustration 64 is located near the base end of one of the left and right side reinforcing plates 61 (near the bottom reinforcing plate 62). This allows all or part of the illustration 64 to be visible regardless of which of the left and right side reinforcing plates 61 is facing up when the reinforcing plate member 6 is folded.

[0042] As shown in Figure 8, the reinforcing plate member 6 is stored in the bag body 10 along the inner surface of the bottom portion 1 with the side reinforcing plate 61 and the bottom reinforcing plate 62 overlapping each other, with the illustration portion 64 facing upward. This allows the user of the paper bag 100 to see the illustration portion 64 of the reinforcing plate member 6 when unfolding the bag body 10, facilitating the use of the paper bag 100 as an item storage box.

[0043] 4(B), the assembly procedure for the reinforcing plate member 6, which holds the side reinforcing plate 61 in the reinforcing plate holding portion 7, will be described. First, the bag body 10 is unfolded, and one of the side reinforcing plates 61 is raised up so that it aligns with the side surface portion 4 (Step 1). Next, the leading end of the raised side reinforcing plate 61 is inserted from below into the slit-shaped reinforcing plate holding portion 7 (Step 2). At this time, by curving the midpoint of the length of the raised side reinforcing plate 61 so that it is convex inward (toward the opposite side surface portion 4), it becomes easier to insert the leading end of the side reinforcing plate 61 into the reinforcing plate holding portion 7. Similarly, the other side reinforcing plate 61 is raised up so that it aligns with the side surface portion 4, and the leading end of the side reinforcing plate 61 is inserted from below into the reinforcing plate holding portion 7 (Step 3).

[0044] 6(B), the tip of the side reinforcing plate 61 inserted into the elongated hole forming the reinforcing plate holding portion 7 is positioned between the side folded portion 41 and the inner surface of the side portion 4, and is held by the reinforcing plate holding portion 7. This restricts the tip of the side reinforcing plate 61 from moving inward (toward the opposite side portion 4), preventing the side reinforcing plate 61 from tilting.

[0045] The side reinforcing plate 61 held along the side portion 4 prevents the side portion 4 from folding along the folding line 42. This prevents the side portion 4 from bending, improving the ease of use when using the paper bag 100 as an item storage box.

[0046] Additionally, the tip of side reinforcing plate 61 that rises along side portion 4 is hidden by side folded portion 41. This prevents the item, such as a booklet or clear file, from getting caught on the tip of side reinforcing plate 61 when storing the item in bag body 10, allowing items to be smoothly put in and taken out, improving usability.

[0047] Furthermore, in this embodiment, the slit-shaped elongated hole that forms the reinforcing plate holding portion 7 is formed in the side fold portion 41 from the front fold line 50 to the rear fold line 51, and the ends of the elongated hole of the reinforcing plate holding portion 7 are provided in the front fold portion 21 and the rear fold portion 31. For example, if the end of the elongated hole of the reinforcing plate holding portion 7 is provided in the side fold portion 41, when the tip of the side reinforcing plate 61 is inserted into the reinforcing plate holding portion 7, the side fold portion 41 above the elongated hole will be lifted inward, which could damage the end of the elongated hole.

[0048] In this embodiment, the elongated holes in the reinforcing plate holding portion 7 are formed from the front and rear folds 50 to 51 of the side face folded portion 41, and when the tip of the side face reinforcing plate 61 is inserted into the elongated holes, the entire upper side face folded portion 41 is lifted inward, preventing damage to the ends of the elongated holes. Note that this embodiment does not exclude a configuration in which the ends of the elongated holes forming the reinforcing plate holding portion 7 are provided in the side face folded portion 41.

[0049] 6(C) is a vertical cross-sectional view showing a modified example of the reinforcing plate holding portion. The reinforcing plate holding portion 7 in this modified example is formed by the gap between the lower edge of the side face folded portion 41 and the inner surface of the side face portion 4. By inserting the tip of a side face reinforcing plate 61 from below between the side face folded portion 41 and the side face portion 4, the reinforcing plate holding portion 7 prevents the side face reinforcing plate 61 from tilting. According to this modified example, there is no need to form a slit-shaped elongated hole in the side face folded portion 41, and the reinforcing plate holding portion 7 can be formed with a simpler configuration.

[0050] The reinforcing plate holding portion 7 is not limited to that described in the above embodiment, and may have any configuration as long as it can hold the upper part of the side surface reinforcing plate 61. For example, the reinforcing plate holding portion may be a slit or elongated hole formed in the side surface portion 4 so that the tip of the side surface reinforcing plate 61 can be inserted from below. Furthermore, the reinforcing plate holding portion may be formed of a member separate from the bag body 10, such as a hook-and-loop fastener or a magnet that detachably holds the side surface reinforcing plate 61 and the side surface portion 4 together.

[0051] The paper bag 100 also includes a bottom reinforcing plate 62 that is detachably arranged along the inner surface of the bottom portion 1. The lower ends of the side reinforcing plates 61 are connected to the left and right edges of the bottom reinforcing plate 62. This makes it possible to restrict left-right movement of the lower ends of the side reinforcing plates 61 when the bottom reinforcing plate 62 is arranged along the inner surface of the bottom portion 1 and the upper portions of the side reinforcing plates 61 are held by the reinforcing plate holding portions 7, thereby reliably preventing the side reinforcing plates 61 from coming off the side portions 4.

[0052] As shown in Figures 1 to 3 and 7 to 9, the bag body 10 of the paper bag 100 has a handle hole 8 for carrying the bag by hand. The handle hole 8 is an elongated hole extending in the left-right direction and formed in the upper part of the front part 2 and the back part 3. The shape of the handle hole 8 is not particularly limited, and may be an elongated hole, a horizontally elongated oval hole, a rectangular hole, a circular hole, or the like.

[0053] The bag body 10 also has a tongue 9 connected to the upper edge 81 of the handle hole 8. The tongue 9 is separated from the front part 2 or the back part 3 at a cutting line 91 (see FIG. 3) that is generally C-shaped or U-shaped with an upward opening, and is provided so that it can be folded back upward along the upper edge 81 of the handle hole 8.

[0054] The front folded portion 21 and the back folded portion 31 have insertion holes 82 formed in positions that overlap with the handle holes 8. The insertion holes 82 are oblong holes that are slightly larger than the handle holes 8 and surround the periphery of the handle holes 8. The tongue piece 9 can be folded back toward the inside of the bag body 10 through the insertion holes 82.

[0055] As shown in Figure 8, when the paper bag 100 is used to transport goods, the side reinforcing plate 61 and the bottom reinforcing plate 62 are placed on top of the bottom portion 1, and the reinforcing plates 61, 62 are housed as bottom plates, while the side portion 4 is made foldable. Also, as shown in Figure 9(A), the tongue 9 is folded inside the bag body 10 so that it faces the front folded portion 21 and the back folded portion 31. Then, the bag body 10 can be carried by inserting fingers into the front and rear handle holes 8 and insertion holes 82 and bringing the front folded portion 21 and the back folded portion 31 closer together.

[0056] In the paper bag 100 of this embodiment, the tongue 9 is not completely cut out from the handle hole 8 but is instead folded upward, so the strength of the upper edge 81 of the handle hole 8 can be maintained using only the paper. Furthermore, the thickness of the upper edge 81 of the handle hole 8 can be ensured, preventing it from digging into the user's hand.

[0057] When carrying the paper bag 100, as shown in Figure 9(B), the tongue 9 bent from one handle hole 8 can be inserted into the other handle hole 8 and the inserted tongue 9 can be folded back upward. In this way, the inserted tongue 9 can be caught in the other handle hole 8, keeping the opening 20 closed.

[0058] When using the paper bag 100 as an item storage box, as shown in Figures 1, 2(A), and 7(A), the paper bag 100 can be folded back so that the handle hole 8 is covered with the tongue 9. This makes it possible to prevent documents and other items stored in the bag body 10 from being visible through the handle hole 8.

[0059] It is also possible to carry the paper bag 100 by raising the side reinforcing plate 61 and holding its tip in the reinforcing plate holding portion 7 to prevent the side portion 4 from folding in, folding the tongue 9 inward, and inserting fingers into the front and rear handle holes 8 and insertion holes 82. In this case, by using the fingers inserted into the handle holes 8 and insertion holes 82 to bend the front portion 2 and the rear portion 3 inward so that the upper edges of the front portion 2 and the rear portion 3 approach each other, the paper bag 100 can be carried with one hand.

[0060] 7(B), when a force is applied in a direction that bends the front portion 2 and the back portion 3 inward with the front and rear tongue pieces 9 stacked one on top of the other in a substantially horizontal position, the tip of the upper tongue piece 9 (the edge opposite the top side 81) gets caught on the upper edge of the insertion hole 82, restricting the upward rotation of the tongue piece 9. The lower tongue piece 9 of the stacked front and rear tongue pieces 9 then comes into contact with the fingers inserted in the handle hole 8 and the insertion hole 82. This increases the area of ​​the portion of the bag body 10 that comes into contact with the carrier's fingers, further reducing the likelihood of the handle hole 8 digging into the fingers.

[0061] Furthermore, even when the tip of the side reinforcing plate 61 is held by the reinforcing plate holding portion 7, the paper bag 100 can be curved inward to bring the upper parts of the front portion 2 and back portion 3 closer together, as in the state shown in Figure 9.

[0062] 7(B), the state in which the front and rear tongue pieces 9 are stacked one on top of the other in a substantially horizontal position and the tip of the upper tongue piece 9 is hooked and locked onto the upper edge of the insertion hole 82 can also be achieved with the bag body 10 in a foldable state in which the side reinforcing plate 61 has been removed from the reinforcing plate holding portion 7. In other words, even when the paper bag 100 is used for transporting goods, the tip of the tongue piece 9 that has been inserted through one insertion hole 82 and folded inward can be hooked onto the upper edge of the other insertion hole 82, thereby reducing the likelihood of the handle hole 8 digging into the fingers.

[0063] Although the embodiments and modifications have been described above, the present invention is not limited to the above-described embodiments and can be embodied in various forms. The configuration of each part is not limited to the illustrated embodiments, and various modifications are possible within the scope of the spirit of the present invention. For example, the configurations described in the above-described embodiments and modifications (notes, etc.) may be combined, and additions, omissions, substitutions, and other modifications of the configurations are possible.

[0064] For example, the bag body 10 may not have the folded portions 21, 31, 41. In this case, the reinforcing plate holding portion that holds the upper portion of the side reinforcing plate 61 may be formed, for example, by a slit or a long hole formed in the side portion 4 so that the tip of the side reinforcing plate 61 can be inserted from below.

[0065] The bag body 10 may also be configured such that the side portions 4 can be folded outward, such as a boat-shaped paper bag. The paper bag 100 may also be provided with a carrying string instead of the handle holes 8, or may not be provided with carrying holes or strings.

[0066] Furthermore, the side reinforcing plate 61 may be separated from the bottom reinforcing plate 62, for example, by cutting the connecting portion 63. In this case, the paper bag 100 may not be provided with the bottom reinforcing plate 62, and when the paper bag 100 is used to transport goods, the side reinforcing plate 61 may be detachably arranged along the inner surface of the bottom portion 1 and used as a bottom reinforcing plate. [Explanation of symbols]

[0067] 1 Bottom part 2 Front 3 Back part 4 Side part 6 Reinforcement plate member 7 Reinforcement plate holder 8 Handle hole 9 Tongue piece 10 bags 20 aperture 21 Front fold 31 Back fold 41 Side fold 61 Side reinforcement plate 62 Bottom reinforcement plate 63 Connection part 64 Illustrations 81 Upper edge of handle hole 82 Insertion hole 91 Cutting line 100 paper bags

Claims

1. A foldable paper bag having a bottom portion, a front portion and a back portion connected to the front edge and the rear edge of the bottom portion, and left and right side portions connected to the left and right edges of the bottom portion, respectively, that can be folded inward or outward, and an opening at the top, a side reinforcing plate that is detachably disposed along the inner surface of the side portion with the opening widened; a reinforcing plate holding portion provided on the side surface portion and holding an upper portion of the side surface reinforcing plate; Paper bag with.

2. The front, back and side sections each have a folded portion folded inward at the top thereof, The reinforcing plate holding portion is configured to be able to insert and hold an upper portion of the side reinforcing plate between the folded portion of the side surface portion and the inner surface of the side surface portion. The paper bag according to claim 1.

3. a bottom reinforcing plate detachably disposed along the inner surface of the bottom portion; The lower ends of the side reinforcing plates are connected to the left and right edges of the bottom reinforcing plate. The paper bag according to claim 1 or 2.

4. The side reinforcing plate and the bottom reinforcing plate are made of paper, The connecting portions between the side reinforcing plates and the bottom reinforcing plates are bent so that the side reinforcing plates and the bottom reinforcing plates can be stored along the inner surface of the bottom portion in an overlapping state. The paper bag according to claim 3.

5. Handle holes provided at the upper portions of the front and rear portions; a tongue piece that is separated from the front or rear part along an upwardly opening, generally C-shaped or U-shaped cutting line so as to be connected to the upper side of the handle hole and that can be folded back upward; The paper bag according to claim 1 or 2.

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