Packaging bag

Abstract

The utility model discloses a packaging bag which comprises a bag body, the bag body is provided with a bottom face and side faces which are arranged on the two sides of the bottom face at intervals in the width direction and connected with the bottom face, the side faces on the two sides form connecting faces which are opposite to each other and connected with each other in the two side edges in the length direction, and creases are formed at the connecting positions of the connecting faces on the two sides. And the bag body can be folded along the creases. In addition, bottom folded edges are formed on the edges of the two sides of the bottom face in the length direction, and the bottom folded edges are folded inwards and fixedly connected with the inner surfaces of the corresponding connecting faces. In the height direction of the bag body, a notch extending in the height direction of the bag body is formed in the position, aligned with the folding mark, of the bottom folding edge. By means of the structure, when the packaging bag is folded, the bottom folded edge can be naturally separated along the notch instead of being completely overlapped traditionally. In this way, the phenomena of overlapping and unevenness of the folded edges caused by extrusion in the folding process are remarkably reduced, and the packaging bag is smoother after being folded and convenient to store and transport.

Description

Technical Field

[0001] The utility model relates to the technical field of storage, and particularly relates to a packaging bag. Background Art

[0002] A packaging bag refers to a bag used for packaging goods, and its materials, shapes, sizes and uses vary to meet the protection, storage, transportation and sales requirements of different goods. Packaging bags play a crucial role in modern commerce. They not only protect goods from damage, but also enhance the brand image through design, printing and material selection to attract consumers' attention.

[0003] The design of a packaging bag needs to balance the bearing strength and folding convenience. To ensure that the packaging bag can withstand a certain weight and pressure, connection folds are usually provided between the bottom and the sides to increase the structural stability. These folds play a key supporting role in the structure, preventing the packaging bag from deforming or breaking when under pressure. However, this design may cause some problems during the folding process. Specifically, when folding the packaging bag, the connection folds are prone to squeezing and overlapping with each other, forming a stacking phenomenon. This stacking not only affects the flatness of the appearance of the packaging bag, but also may reduce its bearing performance, because the stacked folds may not distribute the pressure evenly. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the technical problem in the prior art that in order to ensure the bearing strength of the packaging bag, connection folds need to be provided between the bottom and the sides, resulting in the connection folds of the packaging bag being prone to squeezing and overlapping with each other during the folding process, forming a stacking phenomenon, and affecting the flatness when the packaging bag is folded.

[0005] To solve the above technical problem, an embodiment of the utility model discloses a packaging bag. This packaging bag includes a bag body, the bag body has a bottom surface, side surfaces that are arranged on both sides of the bottom surface at intervals in the width direction and are connected to the bottom surface, and connection surfaces that are opposite to each other and connected are formed at both side edges of the two side surfaces in the length direction. A crease is formed at the connection of the two connection surfaces, and the bag body can be folded along the crease.

[0006] Moreover, bottom folds are formed at both side edges of the bottom surface in the length direction, and the bottom folds are folded inwards and fixedly connected to the inner surfaces of the corresponding connection surfaces.

[0007] Wherein, in the height direction of the bag body, at the position where the bottom fold is aligned with the crease, a cut is formed that extends in the height direction of the bag body.

[0008] With the above technical solution, the bottom surface of this packaging bag is connected to the side surfaces on both sides. The two side surfaces form connection surfaces that are opposite to each other and connected along the two side edges in the length direction, thereby forming a cavity for the packaging bag to hold items. Since the bottom surface is connected to the side surfaces on both sides, and the bottom hem of the bottom surface is fixedly connected to the inner surface of the corresponding connection surface, the connection strength between the bottom surface, the side surfaces, and the connection surface is ensured, thus improving the load-bearing capacity of the packaging bag.

[0009] Furthermore, the incision provided on the bottom hem divides the bottom hem into two parts, which are respectively fixed to the connection surfaces of the corresponding side surfaces. Without affecting the connection strength between the bottom edge and the connection surface, when the bag body is folded along the crease, the bottom hem can be separated along the incision, reducing the extrusion and overlap of the bottom hem along the crease during the folding process, improving the flatness of the packaging bag in the folded state, and facilitating the storage of the packaging bag. In addition, since this kind of bottom hem can avoid the stacking phenomenon in the folded state, reduce the wear of the bottom hem, ensure the connection strength between the bottom surface and the connection surface, and extend the service life of the packaging bag.

[0010] The embodiment of the present utility model also discloses a packaging bag. The distance between the incisions in the width direction gradually increases along the height direction from the side close to the bottom surface.

[0011] Moreover, the two side edges of the incision intersect on the side close to the bottom surface, so that the incision is in a "V" shape.

[0012] Or, the two side edges of the incision are spaced apart on the side close to the bottom surface, so that the incision is in a "︺" shape.

[0013] With the above technical solution, the distance between the incisions in the width direction gradually increases along the height direction from the side close to the bottom surface. On the premise of ensuring the connection strength between the bottom surface and the bottom hem, the stacking phenomenon of the bottom hem during the folding process is avoided as much as possible.

[0014] When the two side edges of the incision intersect on the side close to the bottom surface, making the incision in a "V" shape, this kind of incision is easier to process. During folding, it can guide the bottom hem to separate in a more natural way, unfolding along the two sides of the "V" shape respectively to both sides, thus avoiding the local overlap or unevenness phenomenon that may be caused by traditional straight incisions. This design makes the folding process smoother, and the bottom of the folded packaging bag is flatter. In addition, compared with the straight incision, the "V" - shaped incision can disperse stress during folding, reducing the stress concentration phenomenon generated at the incision. This helps to prevent the material fatigue and fracture at the incision caused by long - term folding, and improves the durability of the packaging bag.

[0015] When the two side edges of the incision are spaced apart on the side close to the bottom surface, such that the incision is in the shape of "︺", this design of the incision allows the bottom hem to unfold in a more natural and flexible manner during folding. Due to the spaced arrangement of the two side edges of the incision, the hem can more easily separate along the preset path during the folding process, reducing the phenomena of overlap and unevenness. This helps to achieve a flatter folding effect, making the packaging bag more space-saving during storage and transportation.

[0016] Traditional bottom hems are prone to wear during frequent folding, especially at the crease. The design of this "︺"-shaped incision reduces the direct contact and friction between the bottom hem and the connecting surface by dispersing the stress during folding, thereby reducing the risk of wear. This designed incision helps to extend the service life of the packaging bag and reduce the replacement cost caused by wear.

[0017] In addition, the spaced arrangement of the two side edges of the incision not only enhances the flexibility of folding but also makes the incision itself more robust. When subjected to external forces, this design can better disperse and resist stress, reducing the fracture and damage of the material at the incision. Therefore, the design of the "︺"-shaped incision improves the overall durability of the packaging bag.

[0018] An embodiment of the present utility model also discloses a packaging bag. The included angle between the side edge of the incision and the opening in the height direction is in the range of 5° to 22.5°, and the two side edges of the incision are symmetrically arranged with respect to the axis where the crease is located.

[0019] Adopting the above technical solution, within this angle range, the incision can effectively guide the bottom hem to separate along the predetermined path during folding, avoiding overlap and unevenness at the crease. Especially when the included angle is small (such as 5°, 10°), the incision can provide a smoother transition, making the folding more natural; while when the included angle is slightly larger (such as 15°, 22.5°), the incision can increase the stability of the hem during the folding process while maintaining a certain separation effect.

[0020] An embodiment of the present utility model also discloses a packaging bag. The end of the side edge of the incision close to the bottom surface extends to the edge where the bottom hem meets the bottom surface.

[0021] Adopting the above technical solution, by extending the side edge of the incision to the edge where the bottom hem meets the bottom surface, it can be ensured that during the folding process, the bottom hem can smoothly separate along the entire length of the incision, thereby minimizing the overlap and unevenness phenomena during folding. This design makes the packaging bag more compact and flat after folding, which is beneficial for saving storage space and improving transportation efficiency.

[0022] In addition, the side of the cut extends to the edge where the bottom fold meets the bottom surface, strengthening the connection between the bottom fold and the bottom surface. During the folding and unfolding process, this design helps to disperse stress and reduce the impact on the bottom surface caused by folding, thereby enhancing the overall stability and durability of the packaging bag.

[0023] From a production perspective, this design simplifies the manufacturing and cutting processes of the mold. Since the side of the cut directly extends to the edge where the bottom fold meets the bottom surface, there is no need for additional positioning and adjustment during the cutting process, thus improving production efficiency and accuracy.

[0024] An embodiment of the present utility model also discloses a packaging bag, wherein the two sides of the cut are equidistantly arranged with respect to the axis where the crease is located in the width direction, so that the cut is in the shape of a certain shape.

[0025] Adopting the above technical solution, the design of the cut in a certain shape allows the bottom fold to naturally separate along the two sides of the cut when folded, forming two relatively independent regions. This design reduces the overlap and extrusion between the folds during the folding process, making the bottom of the folded packaging bag flatter.

[0026] Moreover, since the two sides of the cut are equidistantly arranged with respect to the crease axis in the width direction, this symmetric design helps to balance the stress generated during folding, reducing the risk of material fatigue and fracture caused by stress concentration, thereby enhancing the overall structural stability of the packaging bag; at the same time, the design of the cut in a certain shape reduces the wear of the bottom fold during the folding process. Because the cut allows the fold to separate more easily during folding, reducing the friction and extrusion at the crease. This design extends the service life of the packaging bag and reduces the replacement cost caused by frequent folding.

[0027] An embodiment of the present utility model also discloses a packaging bag, wherein the two side edges of the bottom fold in the width direction extend obliquely towards each other from the end close to the bottom surface.

[0028] Adopting the above technical solution, the inclined side edges of the bottom fold enable the bottom fold to bend and separate more easily along a predetermined path when folded. This design reduces the resistance during folding, enabling the packaging bag to reach the required folded form more easily and improving the flexibility and efficiency of folding.

[0029] In addition, due to the opposite inclination of the side edges of the bottom fold, when the packaging bag is folded, these inclined edges will approach and closely fit each other, thereby reducing the voids and looseness after folding. This closely fitting design helps to save storage space and makes the packaging bag more stable when stacked or transported.

[0030] The embodiment of the utility model further discloses a packaging bag, wherein in a pair of connecting surfaces facing each other, an edge of one connecting surface in the width direction extends to form a connecting portion overlapping and fixedly connected with the other connecting surface.

[0031] By adopting the above technical solution, by extending the edge of one connecting surface and overlapping and fixing it with another connecting surface, this design forms an additional connection point or connection area (i.e., a connection portion) between the two. This additional connection enhances the stability and durability of the entire structure, making the packaging bag less likely to deform or be damaged when subjected to external pressure or impact. Moreover, in certain packaging applications that require sealing (such as food packaging, pharmaceutical packaging, etc.), this design can provide better sealing performance. The overlapping and fixed connection portion can form a close contact surface, reduce the risk of leakage, and ensure the stability and safety of the internal environment of the package.

[0032] The embodiment of the utility model further discloses a packaging bag, wherein a pair of connecting surfaces opposite to each other and a bottom folded edge and an inner surface of a corresponding connecting surface are connected by gluing.

[0033] With the above technical solution, the adhesive connection can provide strong adhesion to ensure the close fit and firm connection between the connection surfaces and between the bottom fold and the inner surface of the connection surface. This high-strength connection helps to enhance the overall stability and durability of the packaging structure. In addition, the adhesive connection can form a continuous sealing layer to effectively prevent the penetration of liquids, gases or tiny particles. This sealing is particularly important in situations where the internal environment of the package needs to be kept clean, dry or sterile (such as food and drug packaging).

[0034] Furthermore, adhesive connection usually does not leave obvious marks or protrusions on the connection surface, so the appearance of the packaging bag can be kept neat and beautiful.

[0035] The embodiment of the utility model further discloses a packaging bag, wherein the opening periphery of the bag body is formed with a bag opening folded edge folded inward.

[0036] In addition, a pair of handles are provided on both sides of the bag opening in the width direction, and the free end of each handle extends between the side surface and the bag opening folded edge, and is fixedly connected to the inner surface of the side surface and / or the inner surface of the bag opening folded edge.

[0037] With the above technical solution, a bag opening folded edge folded inward is formed on the opening periphery of the bag body, thereby increasing the strength of the bag opening, and the free end of each handle extends between the side surface and the bag opening folded edge, and is fixedly connected to the inner surface of the side surface and / or the inner surface of the bag opening folded edge. This fixing method ensures a firm connection between the handle and the bag body, prevents the handle from falling off or loosening during use, and thus improves the overall stability of the packaging bag.

[0038] An embodiment of the present utility model also discloses a packaging bag, and the bag body is made of any one of non-woven fabric, paper material or paper-like material.

[0039] With the above technical solution, due to its fiber-interwoven structure, non-woven fabric has high durability and can withstand a certain degree of stretching and tearing. For occasions that require high durability and environmental protection, non-woven fabric materials can be selected; while paper materials have good printing performance, and various words, patterns and logos can be easily printed on them, and the cost is relatively low. For occasions that pay attention to cost-effectiveness and printing performance, paper materials or paper-like materials can be selected, so as to meet different usage requirements.

[0040] The beneficial effects of the present utility model are as follows:

[0041] The present utility model discloses a packaging bag, which includes a bag body. The bag body has a bottom surface, side surfaces that are arranged on both sides of the bottom surface at intervals in the width direction and are connected to the bottom surface. The two side surfaces form connecting surfaces that are opposite to each other and connected along the two side edges in the length direction, and a crease is formed at the connection of the two connecting surfaces. The bag body can be folded along the crease. And, bottom flanges are formed at the two side edges of the bottom surface in the length direction, and the bottom flanges are folded inwards and fixedly connected to the inner surfaces of the corresponding connecting surfaces. Among them, in the height direction of the bag body, at the position where the bottom flanges are aligned with the crease, there are cuts extending along the height direction of the bag body. By providing cuts on the bottom flanges of this packaging bag, the bottom flanges are divided into two parts and are respectively fixed to the two side connecting surfaces. This structure enables the bottom flanges to naturally separate along the cuts when the packaging bag is folded, rather than the traditional complete overlap. This significantly reduces the overlap and unevenness of the flanges caused by extrusion during the folding process, making the packaging bag flatter after folding and facilitating storage and transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is an unfolded schematic diagram of the packaging bag provided by the embodiment of the present utility model;

[0043] Figure 2 is a partial schematic diagram of the "V"-shaped cut of the bottom flange of the packaging bag provided by the embodiment of the present utility model;

[0044] Figure 3 is for the bottom flange of the packaging bag provided by the embodiment of the present utility model partial schematic diagram of the cut;

[0045] Figure 4 is for the bottom flange of the packaging bag provided by the embodiment of the present utility model partial schematic diagram of the cut;

[0046] Figure 5Another Partial schematic view of the shaped incision;

[0047] Figure 6 Schematic structural view of the packaging bag provided by the embodiment of the present utility model;

[0048] Figure 7 Another schematic structural view of the packaging bag provided by the embodiment of the present utility model.

[0049] Explanation of reference numerals

[0050] 10. Packaging bag;

[0051] 100. Bag body;

[0052] 110. Bottom surface;

[0053] 120. Side surface;

[0054] 130. Connection surface;

[0055] 140. Bottom hem; 141. Incision;

[0056] 150. Bag mouth hem;

[0057] 200. Handle. Detailed implementation manners

[0058] In the design of packaging bags, it is indeed necessary to balance the two key factors of load-bearing strength and folding convenience. To enhance the load-bearing strength of the packaging bag, it is a common practice to set a connecting hem between the bottom and the side. The connecting hem provides additional structural support to prevent the packaging bag from deforming or breaking under load. However, during the folding process, these connecting hems are prone to squeezing and overlapping with each other, forming a stacking phenomenon. This stacking not only affects the flatness of the appearance of the packaging bag but also may reduce its load-bearing performance.

[0059] To this end, the present utility model provides a packaging bag, which includes a bag body. The bag body has a bottom surface, side surfaces that are arranged on both sides of the bottom surface at intervals in the width direction and are connected to the bottom surface, and the two side surfaces form a connection surface that is opposite and connected to each other along the two side edges in the length direction. A crease is formed at the connection of the two connection surfaces, and the bag body can be folded along the crease. To enhance the load-bearing strength of the packaging bag, a bottom hem is provided between the bottom surface and the connection surface, and an incision extending along the height direction of the bag body is formed at the position where the bottom hem is aligned with the crease. The incision helps to reduce the mutual squeezing and overlapping of the bottom hem during the folding process, improving the smoothness and flatness of folding.

[0060] To make the objectives, technical solutions and advantages of the present utility model clearer, the following will further describe in detail the embodiments of the present utility model with reference to the accompanying drawings.

[0061] As Figure 1 , Figure 6 and Figure 7 shown, an embodiment of the present utility model provides a packaging bag 10, which includes a bag body 100. The bag body 100 has a bottom surface 110, side surfaces 120 that are spaced apart from both sides of the bottom surface 110 in the width direction and are connected to the bottom surface 110. The two side surfaces 120 form connection surfaces 130 that are opposite to and connected to each other along the two side edges in the length direction. The connection surfaces 130 on both sides are joined to form a crease, and the bag body 100 can be folded along the crease.

[0062] Moreover, bottom flanges 140 are formed along the two side edges of the bottom surface 110 in the length direction. The bottom flanges 140 are folded inward and fixedly connected to the inner surfaces of the corresponding connection surfaces 130.

[0063] Wherein, in the height direction of the bag body 100, at the position where the bottom flange 140 is aligned with the crease, a cut 141 extending along the height direction of the bag body 100 is formed.

[0064] The bottom surface 110 of this packaging bag 10 is connected to the two side surfaces 120, and the two side surfaces 120 form connection surfaces 130 that are opposite to and connected to each other along the two side edges in the length direction, thus forming a cavity for accommodating items in the packaging bag 10. Since the bottom surface 110 is connected to the two side surfaces 120, and the bottom flanges 140 of the bottom surface 110 are fixedly connected to the inner surfaces of the corresponding connection surfaces 130, the connection strength between the bottom surface 110 and the side surfaces 120 and the connection surfaces 130 is ensured, thereby improving the load-bearing capacity of the packaging bag 10.

[0065] Furthermore, the cut 141 provided on the bottom flange 140 divides the bottom flange 140 into two parts, which are respectively fixed to the connection surfaces 130 of the corresponding side surfaces 120. On the premise of not affecting the connection strength between the bottom edge and the connection surface 130, when the bag body 100 is folded along the crease, the bottom flange 140 can be separated along the cut 141, reducing the situation where the bottom flange 140 is squeezed and overlapped along the crease during the folding process, improving the flatness of the packaging bag 10 in the folded state, and being beneficial to the storage of the packaging bag 10. In addition, since this kind of bottom flange 140 can avoid the stacking phenomenon in the folded state, the wear of the bottom flange 140 is reduced, the connection strength between the bottom surface 110 and the connection surface 130 is ensured, and the service life of the packaging bag 10 is extended.

[0066] Next, a detailed description will be given of the cut 141 on the bottom flange 140.

[0067] In one embodiment, the spacing of the cut 141 in the width direction gradually increases along the height direction from the side close to the bottom surface 110, and on the premise of ensuring the connection strength between the bottom surface 110 and the bottom hem 140, the accumulation phenomenon of the bottom hem 140 during the folding process is avoided as much as possible.

[0068] Specifically, as Figure 2 shown, the two side edges of the cut 141 intersect on the side close to the bottom surface 110, so that the cut 141 is in a "V" shape. This kind of cut 141 is easier to process. When folding, it can guide the bottom hem 140 to separate in a more natural way, and unfold along both sides of the "V" shape respectively, thus avoiding the local overlap or unevenness phenomenon that may be caused by the traditional straight cut 141. This design makes the folding process smoother, and the bottom of the folded packaging bag 10 is flatter. In addition, compared with the straight cut 141, the "V" - shaped cut 141 can disperse stress during folding and reduce the stress concentration phenomenon generated at the cut 141. This helps to prevent material fatigue and fracture at the cut 141 caused by long - term folding, and improves the durability of the packaging bag 10.

[0069] In another alternative embodiment, as Figure 3 shown, the two side edges of the cut 141 are spaced apart on the side close to the bottom surface 110, so that the cut 141 is in a "︺" shape. This design of the cut 141 allows the bottom hem 140 to unfold in a more natural and flexible way during folding. Due to the spaced - apart arrangement of the two side edges of the cut 141, the hem can more easily separate along the preset path during the folding process, reducing the phenomena of overlap and unevenness. This helps to achieve a flatter folding effect, making the packaging bag 10 more space - saving during storage and transportation.

[0070] The traditional bottom hem is prone to wear during frequent folding, especially at the crease. The design of this "︺" - shaped cut 141 reduces the direct contact and friction between the bottom hem 140 and the connection surface 130 by dispersing the stress during folding, thereby reducing the risk of wear. The cut 141 with this design helps to extend the service life of the packaging bag 10 and reduce the replacement cost caused by wear.

[0071] In addition, the spaced - apart arrangement of the two side edges of the cut 141 not only enhances the flexibility of folding, but also makes the cut 141 itself more robust. When subjected to external forces, this design can better disperse and resist stress, reducing the fracture and damage of the material at the cut 141. Therefore, the design of the "︺" - shaped cut 141 improves the overall durability of the packaging bag 10.

[0072] Optionally, in this embodiment, the opening angle of the side of the incision 141 relative to the height direction is in the range of 5° to 22.5°, and the two sides of the incision 141 are symmetrically arranged with respect to the axis where the crease is located.

[0073] Within this angle range, the incision 141 can effectively guide the bottom hem 140 to separate along a predetermined path during folding, avoiding overlap and unevenness at the crease. Especially when the angle is small (such as 5°, 10°), the incision 141 can provide a smoother transition, making the folding more natural; while when the angle is slightly larger (such as 15°, 22.5°), the incision 141 can increase the stability of the hem during folding while maintaining a certain separation effect. It should be noted that when the opening angle of the side of the incision 141 relative to the height direction is greater than the above angle range, the opening of the incision 141 is relatively large, which may affect the structural strength of the bottom hem 140 itself, and thus cannot effectively strengthen the connection strength between the bottom surface 110 and the connecting surface 130; when the opening angle of the side of the incision 141 relative to the height direction is less than the above angle range, the opening of the incision 141 is relatively small, and it cannot effectively guide the separation of the bottom hem 140 during folding, resulting in possible accumulation of the bottom hem 140 during folding.

[0074] Therefore, a smaller angle is suitable for occasions that require tight folding, while a larger angle is suitable for occasions that require a greater folding amplitude. Those skilled in the art can design according to the actual situation and specific requirements, and this embodiment does not make specific limitations in this regard.

[0075] More specifically, as Figure 2 shown, in this embodiment, the end of the side of the "V"-shaped incision 141 close to the bottom surface 110 extends to the edge where the bottom hem 140 meets the bottom surface 110. It should be noted that, as Figure 3 shown, this "︺"-shaped incision 141 does not extend to the edge where the bottom hem 140 meets the bottom surface 110 to enhance the connection strength between the bottom hem 140 and the bottom surface 110. Of course, the end of the side of the "︺"-shaped incision 141 close to the bottom surface 110 can also extend to the edge where the bottom hem 140 meets the bottom surface 110. Those skilled in the art can design according to the actual situation and specific requirements, and this embodiment does not make specific limitations in this regard.

[0076] In this embodiment, by extending the side of the incision 141 to the edge where the bottom hem 140 meets the bottom surface 110, it can be ensured that during the folding process, the bottom hem 140 can smoothly separate along the entire length of the incision 141, thereby minimizing overlap and unevenness during folding. This design makes the packaging bag 10 more compact and flat after folding, which is beneficial to saving storage space and improving transportation efficiency.

[0077] In addition, the side of the cut 141 extends to the edge where the bottom fold 140 meets the bottom surface 110, strengthening the connection between the bottom fold 140 and the bottom surface 110. During the folding and unfolding process, this design helps to disperse stress and reduce the impact on the bottom surface 110 caused by folding, thereby enhancing the overall stability and durability of the packaging bag 10.

[0078] From a production perspective, this design simplifies the manufacturing and cutting processes of the sheet material. Since the side of the cut 141 directly extends to the edge where the bottom fold 140 meets the bottom surface 110, there is no need for additional positioning and adjustment during the cutting process, thus improving production efficiency and accuracy.

[0079] In still another embodiment, as Figure 4 and Figure 5 shown, the two sides of the cut 141 are equidistantly arranged relative to the axis where the crease is located in the width direction, so that the cut 141 is in the shape of It should be noted that in this embodiment, as Figure 4 shown, One end of the side of the - shaped cut 141 close to the bottom surface 110 extends to the edge where the bottom fold 140 meets the bottom surface 110 to form two independent parts. This design reduces the overlap and extrusion between the folds during the folding process, making the bottom of the folded packaging bag 10 flatter.

[0080] Of course, as Figure 5 shown, One end of the side of the - shaped cut 141 close to the bottom surface 110 may not extend to the edge where the bottom fold 140 meets the bottom surface 110, and on the premise of ensuring that the bottom fold 140 can be separated along the cut 141, the connection strength between the bottom fold 140 and the bottom surface 110 is improved.

[0081] This - shaped cut 141 design allows the bottom fold 140 to naturally separate along the two sides of the cut 141 during folding, forming two relatively independent regions. And, since the two sides of the cut 141 are equidistantly arranged relative to the crease axis in the width direction, this symmetrical design helps to balance the stress generated during folding, reducing the risk of material fatigue and fracture caused by stress concentration, thereby enhancing the overall structural stability of the packaging bag 10; at the same time, the - shaped cut 141 design reduces the wear of the bottom fold 140 during the folding process. Because the cut 141 enables the folds to separate more easily during folding, reducing the friction and extrusion at the crease. This design extends the service life of the packaging bag 10 and reduces the replacement cost caused by frequent folding.

[0082] Furthermore, as Figures 2 - 5As shown, in this embodiment, the two side edges of the bottom hem 140 in the width direction extend obliquely towards each other from the end close to the bottom surface 110.

[0083] Such inclined edges of the bottom hem 140 enable the bottom hem 140 to bend and separate more easily along a predetermined path during folding. This design reduces the resistance during folding, enabling the packaging bag 10 to reach the desired folded form more easily, and improving the flexibility and efficiency of folding.

[0084] In addition, due to the opposite inclination of the edges of the bottom hem 140, when the packaging bag 10 is folded, these inclined edges will approach and closely fit each other, thus reducing the voids and looseness after folding. This closely fitting design helps to save storage space and makes the packaging bag 10 more stable when stacked or transported.

[0085] In summary, the cut 141 on the bottom hem 140 is provided to enable it to separate along the cut 141 during folding, thereby reducing the extrusion and overlap of the bottom hem 140 along the crease during the folding process, and improving the flatness of the packaging bag 10 in the folded state. Of course, the specific design of the cut 141 is not limited to the structures listed in the above several embodiments, and those skilled in the art can design it according to the actual situation and specific requirements. This embodiment does not make specific limitations in this regard.

[0086] The following describes other structures of the packaging bag 10.

[0087] In this example, in a pair of connecting surfaces 130 of the packaging bag 10 that face each other, one of the connecting surfaces 130 extends at the edge in the width direction to form a connecting portion (not shown in the figure) that overlaps and is fixedly connected to the other connecting surface 130.

[0088] In this embodiment, by extending the edge of a connecting surface 130 and overlapping and fixing it with another connecting surface 130, this design forms an additional connection point or connection area (i.e., the connecting part) between the two, and this additional connection enhances the stability and durability of the entire structure, making the packaging bag 10 less likely to deform or be damaged when bearing external pressure or impact. Moreover, in some packaging applications that require sealing (such as food packaging, pharmaceutical packaging, etc.), this design can provide better sealing performance. The overlapping and fixed connecting part can form a tight contact surface, reducing the risk of leakage and ensuring the stability and safety of the internal environment of the package. It should be noted that for the connecting surfaces 130 on both side surfaces 120, the connecting part can be formed on the connecting surface 130 on the same side. When processing the bag shape, the shape of the base material is more regular, reducing the process difficulty; of course, for the connecting surfaces 130 on both sides, the connecting parts can also be formed on the opposite connecting surfaces 130 respectively. When the connecting surfaces 130 of this packaging bag 10 are connected through the connecting parts, the strength of the bag body 100 can be enhanced.

[0089] More specifically, between a pair of connecting surfaces 130 that are opposite to each other and between the bottom hem 140 and the inner surface of the corresponding connecting surface 130, they are adhesively connected.

[0090] Adhesive connection can provide strong adhesive force, ensuring the tight fit and firm connection between the connecting surfaces 130 and between the bottom hem 140 and the inner surface of the connecting surface 130. This high-strength connection helps to enhance the overall stability and durability of the packaging structure. And adhesive connection can form a continuous sealing layer, effectively preventing the penetration of liquids, gases or tiny particles. In occasions where it is necessary to keep the internal environment of the package clean, dry or sterile (such as food and pharmaceutical packaging), this sealing property is particularly important.

[0091] Furthermore, adhesive connection usually does not leave obvious marks or protrusions on the connecting surface 130, so it can keep the appearance of the packaging bag 10 clean and beautiful. And adhesive connection can adapt to connecting surfaces 130 of different materials, shapes and sizes. Whether it is non-woven fabric, plastic, paper or composite material, as long as the appropriate adhesive is selected, reliable connection can be achieved. At the same time, adhesive connection can also adapt to the slight unevenness or deformation between the connecting surfaces 130 to a certain extent.

[0092] Of course, between a pair of connecting surfaces 130 that are opposite to each other and between the bottom hem 140 and the inner surface of the corresponding connecting surface 130, it is not limited to adhesive connection. When the bag body 100 is made of non-woven fabric or other woven materials, heat sealing connection can also be used. Those skilled in the art can design according to the actual situation and specific requirements, and this embodiment does not make specific limitations on this.

[0093] Furthermore, as Figure 1 、Figure 6 and Figure 7 As shown in and

[0094] , in this embodiment, a bag mouth hem 150 that is folded inward is formed at the opening periphery of the bag body 100.

[0094] Moreover, a pair of handles 200 are provided on both sides in the width direction of the opening of the bag body 100. The free end of each handle 200 extends between the side surface 120 and the bag mouth hem 150, and is fixedly connected to the inner surface of the side surface 120 and / or the inner surface of the bag mouth hem 150.

[0095] A bag mouth hem 150 that is folded inward is formed at the opening periphery of the bag body 100, thereby increasing the strength of the bag mouth. The free end of each handle 200 extends between the side surface 120 and the bag mouth hem 150, and is fixedly connected to the inner surface of the side surface 120 and / or the inner surface of the bag mouth hem 150. This fixing method ensures a firm connection between the handle 200 and the bag body 100, preventing the handle 200 from falling off or loosening during use, thereby improving the overall stability of the packaging bag 10.

[0096] Furthermore, on the bag mouth hem 150, a notch corresponding to the free end of the handle 200 is formed, so that the free end of the handle 200 can pass through the notch on the bag mouth side, and then extend between the bag mouth hem 150 and the side surface 120. The free end of the handle 200 can be fixedly connected to the inner surface of the side surface 120, can also be fixedly connected to the inner surface of the bag mouth hem 150, or can be fixedly connected to both the inner surface of the side surface 120 and the inner surface of the bag mouth hem 150. Those skilled in the art can design according to the actual situation and specific requirements, and this embodiment does not make specific limitations on this.

[0097] Certainly, in order to improve the connection strength between the free end of the handle 200 and the inner surfaces of the side surface 120 and the bag mouth hem 150, fasteners penetrating the free end of the handle 200, the side surface 120, and the bag mouth hem 150 can also be provided, thereby improving the connection strength between the handle 200 and the bag body 100. The fasteners can be commonly used pin columns, bolts, or rivets in the art, etc.

[0098] Furthermore, for this packaging bag 10 provided by the present utility model, the bag body 100 is made of any one of non-woven fabric, paper material, or paper-like material.

[0099] Non-woven fabric has high durability due to its fiber intertwined structure and can withstand a certain degree of stretching and tearing. For occasions that require high durability and environmental protection, non-woven fabric materials can be selected; while paper materials have good printing performance, various characters, patterns, and logos can be easily printed on them, and the cost is relatively low. For occasions that pay attention to cost-effectiveness and printing performance, paper materials or paper-like materials can be selected, so as to meet different usage requirements.

[0100] It should be noted that, in addition to the implementation manners of the present utility model described in the above specific embodiments, those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Although the description of the present utility model is introduced in combination with preferred embodiments, this does not mean that the features of this utility model are limited to this implementation manner. On the contrary, the purpose of introducing the utility model in combination with the implementation manner is to cover other alternatives or modifications that may be extended based on the claims of the present utility model. In order to provide a deep understanding of the present utility model, many specific details are included in the above description, and the present utility model can also be implemented without using these details. In addition, in order to avoid confusion or obscuring the key points of the present utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0101] It should be noted that in this specification, similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0102] In the description of this embodiment, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0103] The terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0104] In the description of this embodiment, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific situations.

[0105] Although the present utility model has been illustrated and described by referring to some preferred embodiments thereof, those of ordinary skill in the art should understand that the above content is a further detailed description of the present utility model in combination with specific embodiments, and it cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. Those skilled in the art can make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present utility model.

Claims

1. A packaging bag, characterized in that, It includes a bag body, the bag body having a bottom surface, side surfaces spaced apart from each other along the width direction on both sides of the bottom surface and connected to the bottom surface, and the two side surfaces on both sides form connecting surfaces that face each other and are connected along the two side edges in the length direction. A crease is formed at the junction of the two connecting surfaces, and the bag body can be folded along the crease; and Both side edges of the bottom surface in the length direction are formed with bottom flanges, and the bottom flanges are folded inwards and fixedly connected to the inner surfaces of the corresponding connecting surfaces; Wherein In the height direction of the bag body, at a position where the bottom flange is aligned with the crease, a cut is formed extending along the height direction of the bag body.

2. The packaging bag according to claim 1, wherein, The spacing of the cut in the width direction gradually increases along the height direction from the side close to the bottom surface; and The two side edges of the cut intersect at the side close to the bottom surface, so that the cut is in a "V" shape; or The two side edges of the cut are spaced apart at the side close to the bottom surface, so that the cut is in a "︺" shape.

3. The packaging bag according to claim 2, wherein The opening angle of the side of the cut relative to the height direction is in the range of 5° to 22.5°, and the two side edges of the cut are symmetrically arranged with respect to the axis where the crease is located.

4. The packaging bag according to claim 2, wherein The end of the side of the cut close to the bottom surface extends to the edge where the bottom flange is connected to the bottom surface.

5. The packaging bag according to claim 1, characterized in that, The two side edges of the incision are equidistantly arranged in the width direction relative to the axis where the fold line is located, so that the incision is in the shape of shape.

6. The packaging bag according to claim 1, wherein, Both side edges of the bottom flange in the width direction extend obliquely in a direction facing each other from the end close to the bottom surface.

7. The packaging bag according to any one of claims 1-6, characterized in that, Among a pair of the connecting surfaces facing each other, one of the connecting surfaces extends at the edge in the width direction to form a connecting portion that overlaps and is fixedly connected to the other connecting surface.

8. The packaging bag according to claim 7, wherein, Between the pair of the connecting surfaces facing each other and between the bottom flange and the inner surface of the corresponding connecting surface, they are all adhesively connected.

9. The packaging bag according to any one of claims 1-6, characterized in that, A bag mouth flange that is turned inwards is formed at the peripheral edge of the opening of the bag body; and A pair of handles are arranged on both sides in the width direction of the opening of the bag body, and the free end of each handle extends between the side surface and the bag mouth flange and is fixedly connected to the inner surface of the side surface and / or the inner surface of the bag mouth flange.

10. The packaging bag according to any one of claims 1-6, characterized in that, The bag body is made of any one of non-woven fabric, paper material or paper-like material.

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