Paper bag

Abstract

A paper bag, comprising a bag body (100) and two handles (200) connected to the opening of the bag body (100), wherein the bag body (100) has an accommodating cavity; folded edges (110) that fold towards the inside of the accommodating cavity are formed at the peripheral edge of the opening of the bag body (100); and at the folded edges (110) located on two opposite sides of the paper bag (100), notches (111) are respectively formed at positions corresponding to two free end portions (210) of each handle (200), so that each free end portion (210) of each handle (200) extends into the notch (111) from the inner side of the opening of the bag body (100), extends to a position between the folded edge (110) and a side wall of the bag body (100), and is fixedly connected to the inner surface of the folded edge (110) and the inner surface of the side wall of the bag body (100). The paper bag has enhanced connection strength between the bag body and the handles.

Description

paper bags Technical Field

[0001] This invention relates to the field of packaging bag technology, and in particular to a paper bag. Background Technology

[0002] Tote bags are a common type of packaging container, typically featuring two handles for easy carrying. With increasing environmental awareness, more and more businesses and consumers are paying attention to the eco-friendly performance of tote bags. Paper tote bags are favored for their recyclability. They are widely used in various fields, including retail, gift packaging, and business events. In the retail industry, tote bags are an indispensable shopping aid; in gift packaging, exquisite tote bags can enhance the perceived value and prestige of gifts; and in business events, customized tote bags have become an important means for companies to promote their brand image.

[0003] The handle of a paper bag, as the primary component for carrying, directly determines the bag's load-bearing capacity through its connection strength with the bag body. A strong connection ensures that the paper bag is not easily broken or detached when loaded with heavy objects, thus meeting the needs of various usage scenarios. Therefore, the connection strength between the paper bag handle and the bag body directly affects the bag's performance, safety, and user experience. In existing technologies, the handle of a paper bag is generally fixed to the bag body using methods such as perforation and knotting, adhesive bonding, or hot melt adhesive fixation. For example, a Chinese patent document (patent number CN211996875U) discloses a double-sided center-sealed M-bottom three-dimensional paper bag. The handle of this paper bag is made by first fixing the free end to a sheet-like handle piece, and then adhering the sheet-like handle piece to the inside of the bag body, thereby using the handle piece to enhance the connection strength between the paper bag handle and the bag body.

[0004] However, to increase the connection strength between the bag body and the handle, an additional handle piece adapted to the free end of the handle is required. This not only increases the production cost of the paper bag, but also may generate excess paper waste due to the need to cut the handle piece, resulting in paper waste. Furthermore, the paper bag manufacturing process of the aforementioned prior art is relatively complex, cumbersome, inefficient, and has a high scrap rate. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problems in the prior art, where in order to increase the connection strength between the bag body and the handle, an additional handle piece adapted to the free end of the handle is required, which increases the production cost of paper bags. In addition, cutting the handle piece may generate excess paper waste, resulting in paper waste, as well as the technical problems of complex manufacturing process and low production efficiency.

[0006] To solve the above-mentioned technical problems, embodiments of the present invention disclose a paper bag, which includes a bag body having a receiving cavity, the periphery of the opening of the bag body having a folded edge that folds inward toward the receiving cavity, and the bottom surface of the bag body having an inward folding crease, wherein the bottom surface of the bag body in the folded state folds inward toward the receiving cavity along the inward folding crease.

[0007] Furthermore, a pair of handles are provided on opposite sides of the bag opening. Cutouts are formed on the folded edges on opposite sides of the bag opening, corresponding to the free ends of the handles. The free end of each handle extends from the inside of the bag opening into the corresponding cutout, extending to the space between the folded edge and the side wall of the bag, and is fixedly connected to the inner surface of the folded edge and the inner surface of the side wall of the bag.

[0008] Using the above technical solution, this paper bag has a folded edge around the opening of the bag body, which folds inward toward the cavity, thereby increasing the structural strength of the bag opening. Furthermore, the cleverly designed slit on the folded edge allows the free end of the handle to extend from the slit to the space between the folded edge and the bag body. This ensures that the free end of the handle is fixedly connected not only to the inner surface of the folded edge but also to the inner surface of the side wall of the bag body, thus guaranteeing the connection strength between the bag body and the handle. Compared to the existing technology where the handle is connected between the outer surface of the folded edge and the fixing paper, this paper bag does not require additional fixing paper, reducing production costs and avoiding paper waste. Simultaneously, compared to the cumbersome steps of first fixing the free end to a sheet-like handle and then gluing the sheet-like handle to the inside of the bag, this paper bag only requires the handle to be passed through the slit and fixed to the folded edge, then the folded edge is folded over and fixed to the bag body along with the free end of the handle. This simplifies the paper bag forming process, reduces the manufacturing difficulty, and thus improves the yield rate.

[0009] Furthermore, the bottom of this bag can be folded inward along the inward crease toward the cavity, so that the bag is in a folded state, making it easy to store the paper bag.

[0010] The present invention also discloses a paper bag, the cut of which includes a main cut and auxiliary cuts connected to both ends of the main cut. The length of the main cut is adapted to the width of the cross-section of the handle, and the auxiliary cuts located on both sides of the main cut extend in an inclined direction relative to the extension direction of the main cut.

[0011] By adopting the above technical solution, the length of the main cut is matched with the width of the handle's cross-section, so that the free end of the handle can be inserted into the cut and assembled with the main cut relatively stably. Furthermore, the auxiliary cuts located on both sides of the main cut extend in an inclined direction relative to the extension direction of the main cut, so that the cuts can open to a certain degree on the surface of the folded edge, making it easier to insert the free end of the handle between the folded edge and the side wall of the bag body, thus reducing the difficulty of the production process.

[0012] The present invention also discloses a paper bag in which the extension direction of the auxiliary cut is inclined outward relative to the extension direction of the main cut in a direction away from the opening of the bag, and the inclination angle of the extension direction of the auxiliary cut relative to the extension direction of the main cut is in the range of 100° to 145°.

[0013] By adopting the above technical solution, the angle of inclination of the extension direction of the auxiliary cut relative to the extension direction of the main cut is within the above range. On the one hand, it is beneficial for the cut to open a larger opening on the surface of the folded edge, thereby forming a through hole. This not only allows the free end of the handle to extend into the through hole, but also allows the tooling for pulling the free end of the handle to extend into the through hole, further reducing the difficulty of the production process. On the other hand, it avoids the risk of shaking when the free end of the handle extends into the cut, ensuring the assembly accuracy between the free end of the handle and the cut.

[0014] The present invention also discloses a paper bag with a cut that is shaped like a "︹" and is symmetrical about the center line of the main cut.

[0015] By adopting the above technical solution, the "︹"-shaped cut ensures that when the free end of the handle passes through the through hole opened by the cut, the opening of the main cut is the same along the length direction, which is conducive to the accurate assembly of the free end of the handle with the main cut.

[0016] An embodiment of the present invention also discloses a paper bag in which the extension direction of the main cut is parallel to the extension direction of the crease of the folded edge.

[0017] By adopting the above technical solution, the extension direction of the free end of the handle into the main cut is perpendicular to the extension direction of the main cut, while the extension direction of the main cut is parallel to the extension direction of the crease of the folded edge. This makes the extension direction of the free end of the handle into the main cut perpendicular to the extension direction of the crease of the folded edge. As a result, when the handle bears the weight from the bag body, the force on the handle is transmitted to the gripping part along the handle axis, reducing the movement of the free end of the handle along the length of the cut and reducing the risk of the cut end being pulled and torn by the handle.

[0018] The present invention also discloses a paper bag in which the distance between the main cut and the crease of the folded edge is in the range of 0mm to 5mm.

[0019] By adopting the above technical solution, the distance between the main cut and the crease of the folded edge is within the above range. When the paper bag is loaded with heavy objects, the handle is subjected to a uniform force from the bag body and the folded edge, which reduces the force of the handle pulling the folded edge in the direction close to the cavity, ensures the connection stability between the folded edge and the bag body, and extends the service life of the paper bag.

[0020] The present invention also discloses a paper bag in which the free end of each handle extends into a corresponding cut from the inside of the bag opening and extends in a direction away from the bag opening.

[0021] Alternatively, the free end of each handle extends from the inside of the bag opening into the corresponding slit and folds over to extend toward the bag opening.

[0022] By adopting the above technical solution, the part of the free end of the handle that extends between the folded edge and the bag body can better connect with the inner surface of the side wall of the bag body and the inner surface of the folded edge, thereby increasing the connection strength between the handle and the bag body.

[0023] The present invention also discloses a paper bag in which the free end of the handle is bonded and fixed to the inner surface of the folded edge by a first adhesive part, and the inner surface of the folded edge is bonded and fixed to the inner surface of the side wall of the bag body by a second adhesive part.

[0024] By adopting the above technical solution, the free ends of the paper bag and the handle, as well as the free ends of the handle and the folded edge, are all bonded and fixed with adhesive parts to ensure the connection strength between the bag body and the handle. Moreover, the bonding method using adhesive parts will not damage the structure of the bag body and the handle itself, thereby ensuring the structural strength of the bag body and the handle at the connection point.

[0025] Embodiments of the present invention also disclose a paper bag, which further includes a free end extending through the bag body, a handle, and a fastener for the folded edge.

[0026] By adopting the above technical solution, the fasteners that penetrate the bag body, the free end of the handle, and the folded edge can increase the connection strength between the free end of the handle and the folded edge and the bag body, thereby improving the load-bearing capacity of the paper bag.

[0027] An embodiment of the present invention also discloses a paper bag, wherein one end of the fastener has an end cap, and the end cap abuts against the outer surface of the side wall of the bag body.

[0028] By adopting the above technical solution, the end cap at one end of the fastener can, on the one hand, press the free end of the bag body, the handle, and the folded edge to ensure the assembly stability of the three; on the other hand, the outer surface of the end cap can also be coated with patterns to increase the aesthetics of the paper bag.

[0029] The present invention also discloses a paper bag, wherein the handle is configured to have a sheet-like or flat arc-shaped cross-section at least at the free end.

[0030] Furthermore, the handle is made of any one of the following materials: fabric, paper, or paper-like material.

[0031] Using the above technical solution, the arc-shaped handle is advantageous for hand gripping, and the cross-section of the handle at least at the free end is sheet-like or flat, which facilitates the free end of the handle to extend into the cut on the folded edge. Furthermore, the handle made of woven fabric, paper material, or paper-like material has high structural strength, which can ensure that the handle is not easily broken or falls off when the paper bag is loaded with heavy objects.

[0032] The present invention also discloses a paper bag having a pair of opposing sides arranged in the thickness direction of the cavity, and a pair of connecting surfaces arranged between the pair of sides.

[0033] Each side has outwardly extending connecting parts on both sides. The edges of the sides are joined to the connecting parts on each side, forming creases. The connecting parts of the two sides of a pair of sides overlap and are glued together to form a pair of connecting surfaces.

[0034] Creases are formed at the bottom of the two sides where they meet the bottom surface.

[0035] The bottom ends of a pair of connecting surfaces are connected to the bottom surface by a pair of bottom flanges. The bottom flanges are formed on both sides of the bottom surface and folded inward toward the cavity. The outer wall of the bottom flange is bonded to the inner wall of the corresponding connecting surface.

[0036] Furthermore, each connecting surface has a crease at the center of the cavity in the thickness direction, which folds inward toward the inside of the cavity.

[0037] The indentation on the bottom surface includes a main indentation that extends in the middle of the thickness direction of the cavity and parallel to the side surface, and auxiliary indentations that extend obliquely from the corners of the bottom surface toward the main indentation.

[0038] Using the above technical solution, the bag has high structural strength. When the sides are squeezed along the width direction, the sides of the bag fold from the connection point of the connecting surface. The bottom surface of the bag folds towards the cavity with its own indentation and auxiliary indentation, so that the paper bag is in a folded state. There are no fold marks on the sides of the paper bag, which will not affect the printing of various patterns on the sides, so that the sides of the paper bag can meet various pattern designs.

[0039] The beneficial effects of this invention are as follows:

[0040] This invention discloses a paper bag comprising a bag body and two handles connected to the opening of the bag body. The bag body has a receiving cavity, and the periphery of the opening of the bag body has a folded edge that folds inward toward the receiving cavity. An inward folding crease is formed on the bottom surface of the bag body, and when folded, the bottom surface of the bag body folds inward toward the receiving cavity along the inward folding crease. Furthermore, on the folded edges located on opposite sides of the paper bag, slits are formed at positions corresponding to the two free ends of each handle. The free end of each handle extends from the inside of the opening of the bag body into the slit and extends between the folded edge and the side wall of the bag body, and is fixedly connected to the inner surface of the folded edge and the inner surface of the side wall of the bag body. This ingenious slit formation on the folded edges allows the free ends of the handles to extend from the slits to between the folded edge and the bag body, ensuring that the free ends of the handles are fixedly connected not only to the inner surface of the folded edge but also to the inner surface of the side wall of the bag body, thereby ensuring the connection strength between the bag body and the handles. Attached Figure Description

[0041] Figure 1 is a schematic diagram of the paper bag in an unfolded state according to an embodiment of the present invention;

[0042] Figure 2 is a schematic diagram of the paper bag in a folded state provided in an embodiment of the present invention;

[0043] Figure 3 is a schematic diagram of the structure of the handle and the cut edge of the paper bag provided in an embodiment of the present invention;

[0044] Figure 4 is a schematic diagram of another structure of the handle and the cut edge of the paper bag provided in an embodiment of the present invention;

[0045] Figure 5 is a schematic diagram of another structure of the paper bag provided in the embodiment of the present invention at the cut edge of the handle and folded edge;

[0046] Figure 6 is a cross-sectional view of the handle and the cut edge of the paper bag provided in an embodiment of the present invention;

[0047] Figure 7 is a schematic diagram of the structure of the paper bag with fasteners provided in an embodiment of the present invention;

[0048] Figure 8 is a cross-sectional view of the handle and the cut edge of the paper bag with fasteners provided in an embodiment of the present invention;

[0049] Figure 9 is a schematic diagram of the structure of the unformed paper of the paper bag provided in an embodiment of the present invention.

[0050] Reference numerals in the attached figures: 10. Paper bag; 100. Bag body; 110. Folded edge; 111. Cut; 112. Main cut; 113. Auxiliary cut; 114. Opening crease; 120. Bottom surface; 121. Inward fold crease; 122. Main crease; 123. Auxiliary crease; 124. Bottom fold; 130. Side; 131. Connecting surface; 132. Connecting part; 133. Bottom edge crease; 134. Side edge crease; 135. Connecting surface crease; 200. Handle; 210. Free end; 300. Fastener; 310. End cap. Detailed Implementation

[0051] Tote bags are a common type of packaging container, usually with two handles for easy carrying. The strength of the connection between the handles and the bag body plays a crucial role in the overall performance and lifespan of the tote bag.

[0052] High-strength connections ensure the stability of the tote bag when loaded with heavy items, preventing items from scattering or the bag from being damaged due to broken connections. This is especially important for consumers who need to carry heavy items (such as books, documents, shopping goods, etc.). Tote bags with insufficient connection strength are prone to handles detaching or breaking during frequent use, which not only affects the appearance but also significantly reduces the tote bag's lifespan. Furthermore, high-strength connections allow the tote bag to maintain its integrity even after repeated pulling, squeezing, and other external forces, thus improving its durability.

[0053] In existing technologies, to ensure the connection strength between the handle and the bag body of a paper bag, methods such as perforation and knotting, glue bonding, and hot melt adhesive fixing are commonly used to secure the handle to the bag body. When using glue to fix the handle, the free end of the handle is usually fixed to a handle piece first, and then the handle piece is fixed to the bag body to ensure the connection strength between the handle and the bag body. However, to increase the connection strength between the bag body and the handle, an additional handle piece adapted to the free end of the handle is needed, which increases the production cost of the paper bag. Moreover, cutting the handle piece may generate excess paper waste, resulting in paper waste. Furthermore, the manufacturing process of the paper bags in the above-mentioned existing technologies is relatively complex, cumbersome, inefficient, and has a high scrap rate.

[0054] To address this, the present invention provides a paper bag in which the bag body has a folded edge at the edge of the opening that folds inward toward the receiving cavity to increase the structural strength of the opening. Furthermore, a slit is formed on the folded edge so that the free end of each handle extends from the inside of the opening into the slit and extends between the folded edge and the side wall of the bag body, and is fixedly connected to the inner surface of the folded edge and the inner surface of the side wall of the bag body, thereby increasing the connection strength between the bag body and the handle. Additionally, an inward fold crease is formed on the bottom surface of the bag body. When the bag body is in the unfolded state, the bottom surface folds inward toward the receiving cavity along the inward fold crease, so that the bag body is in a folded state, which facilitates the storage of the paper bag.

[0055] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0056] As shown in Figures 1-2 and 9, an embodiment of the present invention discloses a paper bag 10, which includes a bag body 100 having a receiving cavity. The periphery of the opening of the bag body 100 is formed with a folded edge 110 that folds inward toward the receiving cavity, and the bottom surface 120 of the bag body 100 is formed with an inward folding crease 121. When the bag body 100 is in a folded state, the bottom surface 120 folds inward toward the receiving cavity along the inward folding crease 121.

[0057] Furthermore, a pair of handles 200 are provided on opposite sides of the opening of the bag body 100. Cutouts 111 are formed on the folded edges 110 on opposite sides of the opening of the bag body 100, corresponding to the free ends 210 of the handles 200. The free ends 210 of each handle 200 extend from the inside of the opening of the bag body 100 into the corresponding cutout 111, extending to the space between the folded edge 110 and the side wall of the bag body 100, and are fixedly connected to the inner surface of the folded edge 110 and the inner surface of the side wall of the bag body 100.

[0058] This paper bag 10 has a folded edge 110 formed around the opening of the bag body 100, which folds inward toward the receiving cavity, thereby increasing the structural strength of the opening of the bag body 100. Furthermore, this paper bag 10 cleverly incorporates a slit 111 formed on the folded edge 110, allowing the free end 210 of the handle 200 to extend from the slit 111 between the folded edge 110 and the bag body 100. This ensures that the free end 210 of the handle 200 is fixedly connected not only to the inner surface of the folded edge 110 but also to the inner surface of the side wall of the bag body 100, thus guaranteeing the connection strength between the bag body 100 and the handle 200. Compared to the prior art where the handle of the paper bag 10 is connected between the outer surface of the folded edge 110 and the fixing paper, this paper bag 10 does not require additional fixing paper, reducing production costs and avoiding paper waste.

[0059] Furthermore, as shown in Figure 1, the cavity formed inside the unfolded bag 100 is used for storage. The bottom surface 120 of the bag 100 can be folded inward toward the cavity along the inward fold crease 121, so that the bag 100 is in the folded state shown in Figure 2, thereby facilitating the storage of the paper bag 10.

[0060] The connection structure between the bag body 100 and the handle 200 is described below.

[0061] It should be noted that each handle 200 on the paper bag 10 has the same connection structure with the bag body 100. For ease of understanding, take one handle 200 as an example. The function of the handle 200 is to facilitate the user to carry or hang it. When the bag contains heavy items, the design of the handle 200 can provide a stable grip point. Therefore, the connection strength between the handle 200 and the bag body 100 directly determines the load-bearing capacity of the paper bag 10.

[0062] As shown in Figures 1 and 2, in this embodiment, the handle 200 is configured as an arc-shaped structure with a sheet-like or flat cross-section. The arc-shaped structure of the handle 200 facilitates hand gripping, and the sheet-like or flat cross-section of the handle 200 allows the free end 210 of the handle 200 to extend into the cut 111 on the folded edge 110. Furthermore, the handle 200 is made of any one of woven fabric, paper, or paper-like materials, giving it high structural strength and ensuring that the handle 200 is not easily broken or detached when the paper bag 10 is loaded with heavy objects.

[0063] Of course, the handle 200 can also have a connecting piece with a sheet-like or flat cross-section only at the free end 210, while the main body of the handle 200 adopts an arc-shaped structure with a cylindrical or elliptical cross-section. This type of handle 200 adopts a rope-like structure, which has high structural strength, and the connecting piece at the free end 210 can easily extend into the cut 111 of the folded edge 110 to ensure the connection strength between the handle 200 and the bag body 100.

[0064] In this embodiment, the cut 111 on the folded edge 110 includes a main cut 112. The length of the main cut 112 is adapted to the width of the cross-section of the handle 200, so that the free end 210 of the handle 200 extends into the cut 111 and can be assembled with the main cut 112 relatively stably. Furthermore, at both ends of the main cut 112, auxiliary cuts 113 are formed, extending in an inclined direction relative to the extension direction of the main cut 112. This allows the cut 111 to open to a certain degree on the surface of the folded edge 110 along the auxiliary cuts 113 on both sides, so that a through hole is opened at the cut 111. This facilitates the insertion of the free end 210 of the handle 200 between the folded edge 110 and the side wall of the bag body 100. Compared to inserting the free end 210 of the handle 200 into the gap of the cut 111, this greatly reduces the difficulty of the production process.

[0065] In this embodiment, the extension direction of the auxiliary incision 113 is inclined away from the opening relative to the extension direction of the main incision 112, and the inclination angle of the extension direction of the auxiliary incision 113 relative to the extension direction of the main incision 112 is in the range of 100° to 145°. Specifically, the inclination angle of the extension direction of the auxiliary incision 113 relative to the extension direction of the main incision 112 can be 100°, 110°, 125°, 140°, 145° or any inclination angle within the above angle range. This embodiment does not make a specific limitation on this.

[0066] The angle of inclination of the extension direction of the auxiliary cut 113 relative to the extension direction of the main cut 112 is within the aforementioned range. On the one hand, this facilitates the cut 111 to open a larger opening on the surface of the folded edge 110, thereby forming a through hole. This not only allows the free end 210 of the handle 200 to extend into the through hole, but also allows the tooling for pulling the free end 210 of the handle 200 to extend into the through hole, further reducing the difficulty of the production process. On the other hand, it avoids the risk of wobbling when the free end 210 of the handle 200 extends into the cut 111, ensuring the assembly accuracy between the free end 210 of the handle 200 and the cut 111. If the angle of inclination of the extension direction of the auxiliary cut 113 relative to the extension direction of the main cut 112 is less than 100°, the through hole formed by the cut 111 opening along the auxiliary cut 112 will be small, which is not conducive to the free end 210 of the handle 200 passing through the cut 111. If the angle of inclination of the extension direction of the auxiliary cut 113 relative to the extension direction of the main cut 112 is greater than 145°, the free end 210 of the handle 200 will easily wobble along the length direction of the main cut 112 when it passes through the cut 111, thereby reducing the assembly accuracy between the handle 200 and the bag body 100.

[0067] Specifically, as shown in Figure 3, in this embodiment, the cut 111 is generally in the shape of a "︹" and the cut 111 is symmetrical with respect to the center line of the main cut 112. When the folded edge 110 is opened along the edge of the cut 111, an isosceles trapezoidal through hole is formed on the surface of the folded edge 110. This allows the free end 210 of the handle 200 to pass through the through hole opened in the cut 111, while the opening of the main cut 112 is the same along its length. This facilitates accurate assembly between the free end 210 of the handle 200 and the main cut 112.

[0068] As shown in Figure 4, in another embodiment, the extension direction of the auxiliary incision 113 is orthogonal to the extension direction of the main incision 112, such that the incision 111 is... When the folded edge 110 is unfolded along the edge of the cut 111, a rectangular through hole is formed on the surface of the folded edge 110. This allows the free end 210 of the handle 200 to pass through the through hole opened in the cut 111, ensuring that the opening of the main cut 112 is the same along its length, thus completing the assembly of the free end 210 of the handle 200 with the main cut 112. It should be noted that the specific shape of the cut 111 can be designed by those skilled in the art according to actual conditions and specific needs, and this embodiment does not impose specific limitations on it.

[0069] As shown in Figure 5, in another alternative embodiment, the extension direction of the auxiliary incision 113 is inclined towards the opening relative to the extension direction of the main incision 112, such that the incision 111 is... This auxiliary cut 113 also facilitates the free end 210 of the handle 200 passing through the cut 111. Regarding the specific outline shape of the cut 111, the present invention does not impose a unique limitation on it, provided that the free end 210 of the handle 200 can extend between the folded edge 110 and the bag body 100.

[0070] Furthermore, as shown in Figures 3-5, the extension direction of the main cut 112 is parallel to the extension direction of the opening crease 114 of the folded edge 110. The free end 210 of the handle 200 extends into the main cut 112 in a direction perpendicular to the extension direction of the main cut 112. Since the extension direction of the main cut 112 is parallel to the extension direction of the opening crease 114 of the folded edge 110, the free end 210 of the handle 200 extends into the main cut 112 in a direction perpendicular to the extension direction of the opening crease 114 of the folded edge 110. This ensures that when the handle 200 bears the weight from the bag body 100, the force on the handle 200 is transmitted axially to the gripping part, reducing the movement of the free end 210 of the handle 200 along the length direction of the cut 111 and reducing the risk of the end of the cut 111 being pulled and torn by the handle 200.

[0071] Furthermore, the distance between the main cut 112 and the opening crease 114 of the folded edge 110 is within the range of 0mm to 5mm. Specifically, the distance between the main cut 112 and the opening crease 114 of the folded edge 110 can be 0mm, 3mm, 4mm, 4.5mm, 5mm, or other distances within the above range. Because the distance between the main cut 112 and the opening crease 114 of the folded edge 110 is small, the handle 200 of the paper bag 10 receives a uniform force from the bag body 100 and the folded edge 110 when loaded with heavy objects. This reduces the force exerted by the handle 200 on the folded edge 110 in the direction close to the cavity, ensuring the connection stability between the folded edge 110 and the bag body 100, and extending the service life of the paper bag 10.

[0072] Specifically, in one embodiment, the distance between the main cut 112 and the opening crease 114 of the folded edge 110 is 3mm. Because of this distance, the impact of the free end 210 of the handle 200 extending into the cut 111 on the opening crease 114 of the folded edge 110 is reduced, ensuring the smoothness of the edge at the opening of the bag body 100. Furthermore, because the distance between the main cut 112 and the opening crease 114 of the folded edge 110 is small, the pulling force acting on the handle 200 is decomposed. The component of the force pulling the folded edge 110 in the direction close to the cavity is smaller, while the component in the vertical direction is larger, thereby reducing the pulling force on the folded edge 110 when the handle 200 pulls the bag body 100.

[0073] In another embodiment, the main cut 112 is flush with the opening crease 114 of the folded edge 110, that is, the distance between the main cut 112 and the opening crease 114 of the folded edge 110 is 0mm. At this time, when the bag body 100 is lifted by the handle 200, the free end 210 of the handle 200 receives the pulling force from the bag body 100 and the folded edge 110, both of which are vertically downward. The handle 200 can better bear the weight from the bag body 100, while the handle 200 hardly exerts any pulling force on the folded edge 110, thereby ensuring the connection stability between the folded edge 110 and the bag body 100.

[0074] As shown in Figures 1 and 6, in one embodiment, the free end 210 of each handle 200 extends from the inside of the opening of the bag body 100 into the corresponding cutout 111 and extends in a direction away from the opening of the bag body 100. The portion of the free end 210 of the handle 200 extending between the folded edge and the bag body 100 can be better fixedly connected to the inner surface of the side wall of the bag body 100 and the inner surface of the folded edge 110, thereby increasing the connection strength between the handle 200 and the bag body 100.

[0075] In another embodiment, the free end 210 of each handle 200 extends from the inside of the opening of the bag body 100 into the corresponding cutout 111 and folds over to extend toward the opening of the bag body 100. When the bag body 100 is pulled by the handle 200, the free end 210 of the handle 200 forms a "V" shape and wraps around the folded edge 110, so that there is a high connection strength between the handle 200 and the folded edge 110, ensuring that the connection between the handle 200 and the bag body 100 is not easy to break or fall off when loading heavy objects.

[0076] The free end 210 of the handle 200 is bonded to the inner surface of the folded edge 110 by a first adhesive part, and the inner surface of the folded edge 110 is bonded to the inner surface of the side wall of the bag body 100 by a second adhesive part. Therefore, the paper bag 10 and the free end 210 of the handle 200, as well as the free end 210 of the handle 200 and the folded edge 110, are both bonded to each other by adhesive parts, ensuring the connection strength between the bag body 100 and the handle 200. Moreover, the bonding method using adhesive parts will not damage the structure of the bag body 100 and the handle 200 themselves, thereby ensuring the structural strength of the bag body 100 and the handle 200 at the connection point.

[0077] It should be noted that the first adhesive part between the free end 210 of the handle 200 and the inner surface of the folded edge 110 can be connected by array-type dispensing, coating, or hot-melt fixing of adhesive sheets. The second adhesive part between the inner surface of the folded edge 110 and the inner surface of the side wall of the bag body 100 can be connected by hot pressing, coating, or dispensing. This invention does not limit this to a single method.

[0078] As shown in Figure 7, in another embodiment, in order to increase the connection strength between the free end 210 of the handle 200 and the folded edge 110 and the bag body 100, the paper bag 10 also includes a fastener 300 that penetrates the bag body 100, the free end 210 of the handle 200 and the folded edge 110. The fastener 300 further fixes the bag body 100, the free end 210 of the handle 200 and the folded edge 110 together, thereby improving the load-bearing capacity of the paper bag 10.

[0079] Furthermore, as shown in Figure 8, one end of the fastener 300 has an end cap 310, which abuts against the outer surface of the side wall of the bag body 100. On the one hand, it can press the bag body 100, the free end 210 of the handle 200 and the folded edge 110 to ensure the assembly stability of the three. On the other hand, the outer surface of the end cap 310 can also be coated with patterns to increase the aesthetics of the paper bag 10.

[0080] It should be noted that the fastener 300 can be a solid rivet. Axial force is applied to the end cap 310 of the rivet, causing the rivet to penetrate the bag body 100, the free end 210 of the handle 200, and the folded edge 110. The solid rivet passes through the bag body 100, the free end 210 of the handle 200, and the folded edge 110, and its end on the outer surface of the folded edge 110 is thickened to form a rivet head, thereby fastening the bag body 100, the free end 210 of the handle 200, and the folded edge 110 together. Of course, the fastener 300 can also be a hollow rivet; this invention does not limit it to this specific configuration.

[0081] Furthermore, as shown in Figures 1-2 and 9, the paper bag 10 disclosed in this embodiment has a pair of opposing side surfaces 130 in the thickness direction of the cavity, and a pair of connecting surfaces 131 are provided between the pair of side surfaces 130.

[0082] Each side 130 has an outwardly extending connecting portion 132 on both sides. The edge of the side 130 and the connecting portion 132 on each side are connected to form a side crease 134. The connecting portions 132 on the two sides of a pair of side 130 are overlapped and glued together to form a pair of connecting surfaces 131.

[0083] The bottom ends of a pair of connecting surfaces 131 are connected to the bottom surface 120 by a pair of bottom flanges 124. The bottom flanges 124 are formed on both sides of the bottom surface 120 and folded inward toward the cavity. The outer wall of the bottom flanges 124 is bonded to the inner wall of the corresponding connecting surfaces 131.

[0084] Furthermore, a bottom edge crease 133 is formed at the bottom end of the pair of side surfaces 130 where they meet the bottom surface 120, and a connecting surface crease 135 is provided at the middle of the thickness direction of the cavity, which folds towards the inside of the cavity.

[0085] The indentation 121 of the bottom surface 120 includes a main indentation 122 extending in the middle of the thickness direction of the cavity and parallel to the side surface 130, and auxiliary indentations 123 extending obliquely from the corners of the bottom surface 120 toward the main indentation 122.

[0086] This bag 100 has high structural strength. When the sides 130 on both sides are squeezed along the width direction, the sides of the bag 100 fold towards the cavity from the crease 135 on the connecting surface 131. The bottom surface 120 of the bag 100 folds towards the cavity from the self-pressing crease 122 and the auxiliary pressing crease 123, so that the paper bag 10 is in a folded state. There are no fold marks on the sides 130 of the paper bag 10, which will not affect the printing of various patterns on the sides 130, so that the sides 130 of the paper bag 10 can meet various pattern designs.

[0087] In summary, this invention discloses a paper bag 10. The structure of the paper bag 10 will be described below in conjunction with the forming process of the paper bag 10.

[0088] As shown in Figure 9, the bottom ends of a pair of side surfaces 130 of the paper bag 10 are connected by a bottom surface 120. The edges of the pair of side surfaces 130 that are facing away from each other are formed with unfolded folded edges 110. Furthermore, the connecting portions 132 of the two side edges of the pair of side surfaces 130 and the two side edges of the bottom surface 120 are formed with bottom folded edges 124. A main crease 122 extending parallel to the side surfaces 130 and auxiliary creases 123 extending obliquely from the corners of the bottom surface 120 toward the main crease 122 are formed on the bottom surface 120. During the molding process, firstly, the two free ends 210 of the handle 200 are passed through the cuts 111 on the corresponding folded edge 110 and fixed to the inner surface of the folded edge 110 by the first adhesive part. Then, the other handle 200 is fixed to the folded edge 110 in the same way. Next, the folded edge 110 is folded along the opening crease 114, and the free ends 210 of the handle 200 are fixedly connected to the inner surface of the side surface 130 by the second adhesive part. The inner surface of the folded edge 110 and the inner surface of the side surface 130 are then glued together. At this point, the handles 200 on both sides are located away from the bag body 100. Then, the two side surfaces 130 are folded along the bottom edge crease 133, so that the two side surfaces 130 and the bottom surface form a concave shape. Finally, the bottom flange 124 of the bottom surface 120 is folded upward, and the connecting part 132 of the side edge 130 is folded along the side crease 134, so that the connecting parts 132 of the two sides of the side 130 overlap and are glued together to form a pair of connecting surfaces 131, and the outer wall surface of the bottom flange 124 is glued to the inner wall surface of the corresponding connecting surface 131, thus completing the forming process of the paper bag 10.

[0089] Compared to the cumbersome steps in the existing technology of first fixing the free end to the sheet-like handle and then gluing the sheet-like handle to the inside of the bag, this paper bag 10 only requires the handle 200 to be fixed to the folded edge 110 through the cut 111, and then the folded edge 110 to be folded over and fixed together with the free end 210 of the handle 200 to the bag body 100. This simplifies the forming process of the paper bag 10, reduces the difficulty of the process, and thus improves the yield.

[0090] It should be noted that, in addition to the specific embodiments described above, those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details are included in the above description, and the invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0091] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0092] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0093] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0094] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0095] While the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the invention to these descriptions. Various changes in form and detail can be made by those skilled in the art, including several simple deductions or substitutions, without departing from the spirit and scope of the invention.

Claims

1. A paper bag, characterized in that, The bag includes a bag body with a receiving cavity, the periphery of the opening of the bag body having a folded edge that folds inward toward the receiving cavity, and the bottom surface of the bag body having an inward fold crease, wherein the bottom surface of the bag body in the folded state folds inward toward the receiving cavity along the inward fold crease; and A pair of handles are provided on opposite sides of the bag opening. Cutouts are formed on the folded edges on opposite sides of the bag opening, corresponding to the free ends of the handles. The free end of each handle extends from the inside of the bag opening into the corresponding cutout, extends to the space between the folded edge and the side wall of the bag, and is fixedly connected to the inner surface of the folded edge and the inner surface of the side wall of the bag.

2. The paper bag as described in claim 1, characterized in that, The cut includes a main cut and auxiliary cuts connected to both ends of the main cut. The length of the main cut is adapted to the width of the cross-section of the handle. The auxiliary cuts located on both sides of the main cut extend in an inclined direction relative to the extension direction of the main cut.

3. The paper bag as described in claim 2, characterized in that, The auxiliary cut extends outward at an angle away from the bag opening relative to the main cut, and the angle of inclination of the auxiliary cut relative to the main cut is in the range of 100° to 145°.

4. The paper bag as described in claim 2, characterized in that, The incision is shaped like a "︹" and is symmetrical about the centerline of the main incision.

5. The paper bag as described in any one of claims 2-4, characterized in that, The main cut extends in a direction parallel to the direction of the crease of the folded edge.

6. The paper bag as described in claim 5, characterized in that, The distance between the main cut and the crease of the folded edge is in the range of 0mm to 5mm.

7. The paper bag as described in claim 5, characterized in that, The free end of each handle extends from the inside of the bag opening into the corresponding slit and extends in a direction away from the bag opening; or The free end of each handle extends from the inside of the bag opening into the corresponding cut and folds over to extend toward the bag opening.

8. The paper bag as described in claim 1, characterized in that, The free end of the handle is bonded to the inner surface of the folded edge by a first adhesive part, and the inner surface of the folded edge is bonded to the inner surface of the side wall of the bag body by a second adhesive part.

9. The paper bag as described in claim 8, characterized in that, The paper bag also includes fasteners extending through the bag body, the free end of the handle, and the folded edge.

10. The paper bag as described in claim 9, characterized in that, One end of the fastener has an end cap, which abuts against the outer surface of the side wall of the bag.

11. The paper bag as claimed in claim 1, characterized in that, The handle is configured such that at least at its free end, the cross-section is a sheet-like or flat arc-shaped structure; and The handle is made of any one of the following materials: woven fabric, paper, or paper-like material.

12. The paper bag as claimed in claim 1, characterized in that, The cavity has a pair of opposing side surfaces along its thickness, and a pair of connecting surfaces are provided between the side surfaces; wherein Each side has an outwardly extending connecting portion on both sides. A crease is formed where the edge of the side meets the connecting portion on each side. The connecting portions of the two sides of the pair of sides overlap and are glued together to form the pair of connecting surfaces. A crease is formed at the bottom of the pair of side surfaces where they meet the bottom surface; The bottom ends of the pair of connecting surfaces are connected to the bottom surface by a pair of bottom flanges. The bottom flanges are formed on both sides of the bottom surface, folding inwards towards the receiving cavity, and the outer wall surface of the bottom flange is bonded to the inner wall surface of the corresponding connecting surface. Each of the connecting surfaces has a crease at the center of the cavity in the thickness direction, which folds towards the inside of the cavity. The indentation on the bottom surface includes a main indentation extending in the middle of the thickness direction of the cavity and parallel to the side surface, and auxiliary indentations extending obliquely from the corners of the bottom surface toward the main indentation.

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