Paper bag with a carrying strap
The paper bag integrates a handle strap into the bag body joints, enhancing strength and simplifying manufacturing by using existing materials, allowing it to carry heavy loads without collapsing.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2021-12-19
- Publication Date
- 2026-03-19
AI Technical Summary
Existing paper bags lack sufficient strength at the joints, leading to potential collapse under heavy loads, and require separate handle attachment, complicating manufacturing.
A paper bag design where a handle or hanging strap is integrated into the bag body joints, using materials like paper, cloth, or resin, and reinforced with sewing to enhance tensile strength and prevent detachment.
The integrated handle strap reinforces the bag joints, preventing collapse and simplifying manufacturing by using materials from the bag body itself, ensuring the bag can carry heavy loads and maintain structural integrity.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention relates to a paper bag, and particularly to a paper bag provided with a carrying strap that can be used as a carrying part or a hanging part.
Background Art
[0002] Paper bags are provided in various designs as simple packaging containers. Especially in recent years, paper bags have been reevaluated due to the problem of marine pollution caused by plastic products, and with the introduction of a fee for plastic shopping bags, the interest in paper bags has been further increasing. Moreover, since the wood used as the raw material for paper bags can be replanted and properly grown to be regenerated decades later, and paper products can be collected and recycled as recycled paper pulp, they are also useful as circular products that achieve the Sustainable Development Goals (SDGs).
[0003] However, since the material of the paper bag is paper, there is a concern that its strength is inferior to that of a plastic bag and it is not suitable for carrying heavy objects. Therefore, some paper bags that can carry heavy objects have been proposed in the past.
[0004] For example, Patent Document 1 (Registered Utility Model No. 3088208) proposes a handle attachment structure for a paper shopping bag that prevents the handle piece from coming off, can adequately withstand relatively heavy items, and does not become unnaturally bulky when stacked. Specifically, it proposes a handle attachment structure for a paper shopping bag characterized by setting a certain width of fold allowance at the upper edge of the opening of the paper bag body, partially or entirely bonding a reinforcing core piece below the set fold allowance, drilling an attachment hole so as to penetrate the paper bag body and the reinforcing core piece at the location where the handle piece is to be attached, inserting both ends of the handle piece into the attachment hole from the outside of the paper bag body, bending both ends of the handle piece that protrude inward from the reinforcing core piece in any direction including the direction opposite to the insertion direction, bonding and fixing the reinforcing core piece with the bent portion as the center, and then folding the fold allowance back inward from above the paper bag body, and partially or entirely bonding and fixing the inside of the reinforcing core piece and the fold allowance.
[0005] Furthermore, Patent Document 2 (Registered Utility Model No. 3033536) proposes a paper tote bag suitable for carrying relatively heavy items, which has a bottom plate at the bottom of the paper bag, an upper through-hole at the top of the paper bag, and a bottom through-hole at the bottom, with a string that runs across the outside of the bottom and is inserted from the bottom through-hole to the upper through-hole to serve as a handle for the paper bag. [Prior art documents] [Patent Documents]
[0006] [Patent Document 1] Registered Utility Model No. 3088208 Gazette [Patent Document 2] Registered Utility Model No. 3033536 Gazette [Overview of the project] [Problems that the invention aims to solve]
[0007] As mentioned above, several technologies have been proposed in the past with the aim of improving the strength of paper bags. However, the handle attachment structure for paper shopping bags proposed in Patent Document 1 is a technology that solely prevents the handles from falling off the shopping bags and does not achieve reinforcement of the joints in the paper bags. Furthermore, the paper bag proposed in Patent Document 2 discloses the use of a string attached across the bottom of the shopping bag as a handle, but even in this paper bag, the strength of the joints in the bag body was not considered at all. On the other hand, the bag body that makes up the main body of the paper bag is made by laminating paper together, and depending on the strength of the lamination, there is a concern that the bag body itself may collapse due to the weight of the contents.
[0008] Therefore, the first objective of the present invention is to provide a paper bag that not only prevents the handles from falling off, but also increases the strength of the joints in the bag body that make up the paper bag, thereby preventing the bag from collapsing due to the weight of its contents.
[0009] Furthermore, in the aforementioned Patent Documents 1 and 2, it is necessary to provide handles separately from the formation of the bag body, and in some cases, it is necessary to prepare and attach the handles separately. Therefore, the second objective of the present invention is to provide a paper bag that can be manufactured simply by utilizing the materials used in the manufacture of the bag body as handles or hanging parts. [Means for solving the problem]
[0010] To solve at least one of the above problems, the present invention provides a paper bag in which a handle portion or a hanging portion is formed using a member used in the joining portion of the bag body.
[0011] In other words, the present invention provides a paper bag equipped with a handle or a hanging strap, comprising a paper bag body and a hanging strap provided on the side of the bag body, wherein the hanging strap is sewn to the side of the bag body and extends at least beyond the top opening of the bag body.
[0012] In such paper bags, the material of the handle strap is not particularly limited, and a strip or string made of paper, cloth, resin, etc., can be used. In particular, if the handle strap is made of paper, overtape (including strip-shaped crepe paper) that has been used in the manufacture of heavy bags, etc., can be used.
[0013] Furthermore, the handle strap may be provided on the side of the bag, and is particularly preferably provided at the joint where the paper is joined during the manufacturing of the bag. In this case, the bag must have paper joined on its side, and may be formed by joining both sides of the folded paper at the bottom, or by joining the ends of the starting and ending points of a cylindrical roll. In particular, when joining both sides of the folded paper at the bottom, the handle strap may be provided at both joints, or at either one. Also, when joining the ends of the starting and ending points of a cylindrical roll, the handle strap may be provided on the other side of the joint. Thus, one or more handle straps may be provided on the side of the bag.
[0014] In the aforementioned carrying strap, the portion that extends beyond the upper opening of the bag can be formed as an extended strap or cord, or it can be folded back to form a loop. In this case, the end of the carrying strap can be fixed to the base of the carrying strap or to the bag by sewing, adhesive, or other means. In particular, the carrying strap that extends beyond the upper opening of the bag can be used as a tie strap or tie cord, and when folded back into a loop, that portion can be used as a hanging part or a handle.
[0015] Furthermore, in the paper bag according to the present invention described above, the bag body is formed by overlapping the front and back portions of the bag at the sides, sandwiching this overlapping portion with the handle strap, and sewing the handle strap and the bag body together from above. It is desirable that the portion of the handle strap that extends beyond the top opening of the bag body is also sewn along its length. By providing sewing threads in the handle strap that extends beyond the top opening of the bag body, the tensile strength and other properties can be increased, and the handle strap can be used as a handle or a hanging portion. Note that the sewing threads provided in the handle strap may be one or two or more. Also, there are no particular restrictions on the sewing method.
[0016] In the paper bag according to the present invention described above, the tip of the handle that extends beyond the top opening of the bag body can be attached to the side of the bag body, so that the portion that extends beyond the top opening of the bag body forms a loop. That is, the handle is folded back and its tip is attached to the side of the bag body (including the handle provided on the side) to form a loop.
[0017] Furthermore, in the paper bag according to the present invention, the handle strap can also be formed from paper material, and the portion extending beyond the top opening of the bag can be formed by sewing it along its length with sewing thread. In other words, it is desirable to sew the handle strap with a sewing machine. This can increase the tensile strength of the handle strap.
[0018] Furthermore, the paper bag according to the present invention may be waterproofed, and a cushioning material may be attached to it. The cushioning material is preferably provided on the inner surface of the bag, and for example, bubble wrap or corrugated kraft paper can be used. However, if the cushioning material is provided on the outer surface of the bag, the waterproofness of the bag can be enhanced if the cushioning material is waterproof. [Effects of the Invention]
[0019] The paper bag with a carrying strap according to the present invention comprises a paper bag body and a carrying strap provided on the side surface of the bag body. The carrying strap is sewn to the side surface of the bag body and extends at least beyond the upper bag opening of the bag body, so that the carrying strap can be used as a hand-carrying part or a hanging part. And the carrying strap can also be used as a member for reinforcing the joint part during the manufacture of the bag body. Therefore, by using the member used during the manufacture of the bag body as a hand-carrying part or a hanging part, the manufacture of a paper bag having a hand-carrying part (or a hanging part) can be easily carried out.
[0020] And since the carrying strap can function as an over-tape (including strip-shaped crepe paper) used for reinforcing the joint part in conventional heavy bags etc., by using the carrying strap, not only can the detachment of the hand-carrying part (or the hanging part) be prevented, but also the strength of the joint part in the bag body constituting the paper bag can be further increased, and a paper bag that can avoid the collapse of the bag body due to the weight of the contained items can be provided. That is, a bag body that can hang or enclose even heavy objects can be realized.
Brief Description of the Drawings
[0021] [Figure 1] (A) Front view, (B) Side view, (C) Cross-sectional view taken along the C-C arrow showing the paper bag with a carrying strap according to the first embodiment. Front view showing the paper bag according to the second embodiment [Figure 2] Front view showing the paper bag according to the second embodiment [Figure 3] (A) Exploded front view of the bag body, (B) Front view of the paper bag showing the paper bag according to the third embodiment [Figure 4] (A) Exploded perspective view, (B) Front view of the paper bag showing the paper bag according to the fourth embodiment [Figure 5] (A) Exploded perspective view, (B) Front view showing the paper bag according to the fifth embodiment
Modes for Carrying Out the Invention
[0022] The paper bag 10 equipped with a handle strap 20 according to this embodiment will be described in detail below with reference to the drawings. Figure 1 is (A) a front view, (B) a side view, and (C) a cross-sectional view taken along the CC arrow, showing the paper bag 10 with a handle strap according to the first embodiment. In particular, the paper bag 10 with a handle strap according to this embodiment consists of a bag body 30 and a handle strap 20 provided at the left and right joints of the bag body 30, both of which are made of paper. The bag body 30 is formed by folding a rectangular piece of paper to form a bottom 31 below the front and back of the bag, and joining the opposing left and right sides 33 together. The left and right sides 33 can be joined together by adhesive or by sewing the handle strap 20 together.
[0023] The handle strap 20 is made of a strip of paper material and is folded to sandwich the joint of the bag body 30, and then sewn with sewing thread 21 using a sewing machine. That is, as shown in Figure 1(C), the ends of the bag body 30, which are brought together on the front and back of the bag, are covered on the outside by the handle strap 20, and the handle strap 20 and the ends of the bag body 30 are sewn together as one unit. As a result, the side 33 of the bag body 30 is securely closed, and even if an item is placed inside the bag body 30, the joint will not open unintentionally.
[0024] In this embodiment, the carrying strap 20 can be made of paper, such as overtape. For example, if overtape made of crepe paper is used, it can follow the stretching and shrinking of the seam in the bag 30, and as a result, damage to the joint can be prevented. Furthermore, the carrying strap 20 is not limited to paper strap material. For example, cloth straps such as woven fabrics or nonwoven fabrics can be used, as well as resin sheets. Even when these carrying straps 20 are used, the strength of the joint in the paper bag 30 can be improved, and damage when items are placed inside can be prevented.
[0025] The handle strap 20 is then sewn to the edge of the bag 30 with suture thread 21 using a sewing machine or the like, as described above. As a result, the handle strap 20 has suture thread (i.e., suture thread 21) running along its length, and this suture thread improves the tensile strength of the handle strap 20 in the length direction.
[0026] In the paper bag 10 constructed as described above, the handle strap 20 (over tape) used to reinforce the joints in forming the bag body 30 is extended beyond the upper bag opening 32, allowing the extended handle strap 20 to be used as a handle or hanging part. At this time, the extended handle strap 20 is also sewn, and the sewing thread (i.e., suture thread 21) is present along its length, eliminating the risk of it tearing when hanging. Therefore, the handle strap 20 allows for the simultaneous reinforcement of the joints of the bag body 30 and the formation of a handle or hanging part.
[0027] In the paper bag 10 according to the embodiment shown in Figure 1, the handle strap 20 that extends beyond the upper opening 32 of the bag is folded back at its tip and fixed to the side of the bag body 30 to form a loop 40 that functions as a handle or hanging part. The folded handle strap 20 can be joined using adhesive, or it can also be formed by sewing. Note that the handle strap 20 that extends beyond the upper opening 32 does not necessarily need to be folded into a loop and can be left extended. In this case, the extended handle strap 20 can be used as a tie string (strap), and in either case it can be used as a handle or hanging part.
[0028] The bag body 30 used in the above-mentioned paper bag 10 can be formed using various paper materials depending on the application. Specifically, it can be formed using coated paper, fine paper, matte paper, art post paper, kraft paper, matte post paper, Kent paper, etc. Furthermore, these paper materials can be used in various thicknesses depending on the application. However, if the handle strap 20 is sewn on by sewing, the paper material constituting the bag body 30 must be of a thickness that allows for sewing. In particular, if the breakage strength of the bag body 30 itself is to be increased, it is desirable to use kraft paper, which is strong and resistant to tearing. In this embodiment, the strength of the paper bag 10 is improved by the use of the handle strap 20, and its effectiveness is particularly enhanced in paper bags 10 made of kraft paper. In particular, if the kraft paper is used in the manufacture of heavy bags, its strength can be increased.
[0029] Figure 2 is a front view showing a paper bag 10 according to a second embodiment. In this embodiment, the paper bag 10 is formed by rolling a rectangular piece of paper into a cylindrical shape, joining and integrating both ends, and joining and integrating the bottom of the bag. In the bag 30 formed in this way, there are joints between the paper materials at the bottom (bottom 31) and the side of the bag, so a strip-shaped handle strap 20 is provided so as to sandwich the joint between the bottom 31 and the side 33. That is, as shown in this embodiment, it is also possible to provide only one handle strap 20 on the side of the bag 30. However, even if there is only one joint (joint between paper materials) on the side of the bag 30, it is of course possible to provide the handle strap 20 on the side of the bag other than the joint. In particular, by providing the handle strap 20, the tensile strength of the paper bag itself can be increased not only by the tensile strength of the handle strap 20 itself, but also by the tensile strength of the stitching (i.e., the suture thread 21) used for sewing, thereby increasing the strength of the paper bag itself.
[0030] Figure 3 shows (A) an exploded front view of the bag body 30 and (B) a front view of the paper bag 10 according to the third embodiment. In this embodiment, the bottom 31 of the bag body 30 is formed as a boat bottom, and a handle strap 20 is provided at the joint of the side 33, as shown in the first embodiment. In this embodiment in particular, the tip of the handle strap 20 is formed in an extended state, and the handle strap 20 can be used as a handle or hanging part by making it a tie string (strap). As shown in Figure 3, even in the state of a boat bottom paper bag 10, the handle strap 20 is provided at the joint that constitutes the bag body 30, so the joint can be made stronger and unintended damage to the bag body 30 can be prevented.
[0031] Figure 4 shows (A) an exploded perspective view and (B) a front view of a paper bag 10 according to the fourth embodiment. In particular, the paper bag 10 according to this embodiment is related to the second embodiment and shows an embodiment in which a gusset is formed on the bag body 30. In particular, in this embodiment, a joint is provided in an area other than the gusset, but a joint may also be provided in the gusset area. In particular, because the paper bag 10 according to this embodiment has a gusset, a large internal volume can be secured, and since a handle strap 20 is provided at all joints, a strong paper bag 10 can be formed despite having a large internal volume.
[0032] Figure 5 shows (A) an exploded perspective view and (B) a front view of a paper bag 10 according to the fifth embodiment. In this embodiment in particular, the bag body 30 is formed by overlapping two sheets of paper material and joining the edges consisting of the bottom 31 and side 33. The edges where the paper materials are joined together are closed by sandwiching them with the handle strap 20 and sewing over them. In a paper bag 10 formed in this way, the joint of the bag body 30 can be made strong, and the risk of damage even when contents are placed inside can be reduced. Furthermore, since the handle strap 20 is extended to a length that can be used as a handle or hanging part, the handle strap 20 provided to reinforce the joint can also be used as a handle or the like.
[0033] Furthermore, in a paper bag 10 made by overlapping two sheets of paper and joining their edges in this manner, the contour shape can be formed into various shapes, and therefore it is possible to form a paper bag 10 with a shape that suits the contents. For example, as shown in Figure 5, the bottom (bottom of the bag) can be formed into an arc shape, as well as into various other shapes such as curved shapes and uneven shapes, and the sides 33 can also be formed into various shapes such as arc shapes, curved shapes or uneven shapes.
[0034] Furthermore, in any of the embodiments described above, cushioning material such as bubble wrap or corrugated kraft paper can be provided inside the bag 30. Such cushioning material will have a certain thickness in order to ensure its cushioning performance, but in any of the embodiments described above, even thick cushioning material can be securely fixed inside the bag 30 by sandwiching the edge of the cushioning material within the joint of the paper material and integrating it by sewing.
[0035] Furthermore, in any of the embodiments described above, the paper material constituting the bag body 30 and the paper material constituting the handle strap 20 can be waterproofed. Such waterproofing can be achieved by laminating a resin layer using a spray or the like, thereby enhancing waterproofing and providing a paper bag 10 that can be used for a long period of time. [Industrial applicability]
[0036] The paper bag equipped with a handle of the present invention can be used as a paper bag for storing various items, and can be formed not only as a tote bag but also as various other types of bags such as backpacks. Furthermore, this bag can be used not only as a bag for everyday items but also as an industrial bag for storing grains, soil, etc. [Explanation of Symbols]
[0037] 10 paper bags 20. Sash 21 Sutures 30 Bag body 31 Bottom 32 Upper bag opening 33 Side 40 loops
Claims
1. A paper bag having a handle or a strap that serves as a hanging part, It consists of a paper bag and a handle attached to the side of the bag. The carrying strap is sewn to the side of the bag and extends at least beyond the top opening of the bag. A paper bag in which the portion extending beyond the top opening of the bag is either formed as an extended band or string, or folded back and the tip is attached to the side of the bag, thereby forming a loop in the portion that extends beyond the top opening of the bag.
2. The bag is closed by overlapping the front and back of the bag at the sides, sandwiching this overlapping portion with the handle strap, and then sewing the handle strap and the bag together from above. A paper bag having a handle strap according to claim 1, wherein the portion of the handle strap that extends beyond the upper opening of the bag is also sewn along its length.
3. A paper bag with a handle strap according to claim 1 or 2, wherein the bag body is waterproofed or has cushioning material attached to it.
4. A paper bag having a handle strap according to any one of claims 1 to 3, wherein the handle strap is formed of an overtape made of crepe paper, and the portion extending beyond the top opening of the bag is sewn along its length.
Citation Information
Patent Citations
JP1964-020515Y
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JP1977107920U
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JP1990025450U