Three-dimensional bag

Abstract

The utility model provides a three-dimensional bag which comprises a bag body with a containing cavity, the bag body comprises a pair of side faces arranged at intervals in the width direction of the three-dimensional bag, a bottom face far away from one side of a bag opening in the height direction of the three-dimensional bag, and a pair of connecting faces respectively connected with the pair of side faces and the bottom face in the length direction of the bag body. A first main indentation extending in the height direction is formed in the middle of the connecting face on each side in the width direction, and an auxiliary indentation obliquely extending to the corresponding corner of the bottom face from the first main indentation relative to the height direction is formed in the position, close to the bottom face, of the first main indentation. A second main indentation extending in the length direction is formed in the middle of the bottom face in the width direction, and the bag body can be folded along the first main indentation, the second main indentation and the auxiliary indentation. Therefore, on the premise of ensuring that the three-dimensional bag can be folded smoothly, the number of the indentations on the bottom surface is reduced, the influence of the indentations on the strength of the bottom surface is reduced, and the three-dimensional bag has both bearing strength and folding convenience.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging, in particular to a three-dimensional bag. Background Art

[0002] Three-dimensional bags refer to bags used for packaging goods. They are made of different materials, shapes, sizes and uses to meet the protection, storage, transportation and sales needs of different goods. In addition, the design of three-dimensional bags needs to take into account both load-bearing strength and folding convenience, so that the three-dimensional bags can not only carry items well, but also ensure that the bag body can be conveniently stored and transported.

[0003] Traditional three-dimensional bags usually form the bottom of the bag body by bonding the bottom ends of the side walls of the bag body together. However, the bottom of this type of bag is only connected by connecting the bottom ends of the side walls of the bag body. When it is loaded with heavy objects or left for a long time, the connection at the bottom of the bag body may fail, resulting in the bag bottom being transparent, the items in the bag falling out, and other undesirable situations. In addition, in order to facilitate folding, the three-dimensional bag has a plurality of complex and extended folds on the bottom surface, which guide the folding of the bottom surface. These complex folds will directly affect the structural strength of the bottom surface of the bag body. Deeper folds may weaken the load-bearing capacity of the bag body, especially at the folding point. At the same time, wider folds may increase the stress concentration of the bag body when it is folded, making it more likely to be damaged. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problem that in the prior art, a three-dimensional bag has a plurality of complex and extended folds on the bottom surface for easy folding, thereby guiding the folding of the bottom surface, but these complex folds will directly affect the structural strength of the bottom surface of the bag body, and deeper folds may even weaken the load-bearing capacity of the bag body.

[0005] In order to solve the above-mentioned technical problems, an embodiment of the utility model discloses a three-dimensional bag, which includes a bag body with a accommodating cavity, the bag body includes a pair of side surfaces arranged at intervals along the width direction of the three-dimensional bag, a bottom surface away from the bag opening in the height direction of the three-dimensional bag, and a pair of connecting surfaces respectively connecting the pair of side surfaces and the bottom surface in the length direction of the bag body.

[0006] Among them, a first main indentation extending along the height direction is formed in the middle of the connecting surface on each side in the width direction, and a second main indentation extending along the length direction is formed in the middle of the bottom surface in the width direction; and, on the connecting surface on each side, an auxiliary indentation extending from the first main indentation obliquely relative to the height direction to the corresponding corner of the bottom surface is formed near the bottom surface of the first main indentation.

[0007] Furthermore, in the folded state, the bag body is folded along the first main indentation, the second main indentation and the auxiliary indentation.

[0008] This three-dimensional bag is surrounded by a pair of side surfaces, a pair of connecting surfaces and a bottom surface to form a receiving cavity, and the three-dimensional bag can store items through the receiving cavity. Among them, the bottom surface of the three-dimensional bag acts as the main force-bearing surface for carrying items, and needs to have high strength. Therefore, this three-dimensional bag forms a first main indentation and an auxiliary indentation on the connecting surface, and only forms a second main indentation on the bottom surface, thereby guiding the folding of the three-dimensional bag. Since this three-dimensional bag sets more indentations on the connecting surface, and only a single second main indentation is set on the bottom surface, the complex indentations are transferred to the connecting surface of the three-dimensional bag, and the bottom surface only needs to be folded along the second main indentation.

[0009] Compared with the prior art, which requires multiple auxiliary creases on the bottom surface to guide the folding of the bottom surface, this three-dimensional bag reduces the number of indentations on the bottom surface while ensuring that the three-dimensional bag can be folded smoothly, simplifies the folding process of the bottom surface, and reduces the influence of the indentations on the strength of the bottom surface, so that the three-dimensional bag can have both high load-bearing strength and folding convenience.

[0010] In addition, since only a second main indentation extending in the length direction is provided on the bottom surface, it will not have a significant impact on the bottom surface even in the unfolded state, ensuring that the three-dimensional bag can be supported flatly with the bottom surface, thereby improving the placement stability of the three-dimensional bag in the unfolded state.

[0011] Furthermore, in order to make the three-dimensional bag more convenient and stable to fold, in one embodiment, when viewed along the length direction of the three-dimensional bag, the first main indentation and the second main indentation extend continuously with each other. This continuity ensures that the bag body can form a stable structure along the two main indentations when folded, thereby avoiding the looseness of the three-dimensional bag after folding or irregular folding of the three-dimensional bag, thereby improving the folding stability of the three-dimensional bag.

[0012] In addition, two auxiliary indentations are formed on the connecting surface of each side near the bottom surface. On the connecting surface of each side, the two auxiliary indentations extend obliquely from the same bending point of the first main indentation toward the bottom surface and extend symmetrically relative to the first main indentation.

[0013] During the folding process, the bottom surface of the three-dimensional bag is folded along the second main indentation, and the part of the connecting surface close to the ground will be squeezed or pulled by the bent bottom surface and guided by the two auxiliary indentations to be bent along the two auxiliary indentations, that is, the connecting surface is located on the side of the bending point away from the bottom surface, and will bend along the first main indentation; and the connecting surface is located on the side of the bending point close to the bottom surface, it will be regularly bent along the two auxiliary indentations and the first main indentation, the two auxiliary indentations intersect at the same bending point of the first main indentation and extend obliquely toward the bottom surface, this inclined design helps to guide the material during the folding process so that it can fit together more smoothly and tightly; and the two auxiliary indentations extend symmetrically relative to the first main indentation, which can ensure that the folded bag body is more balanced and stable in structure, and avoid irregular folding caused by the bending of the bottom surface.

[0014] Furthermore, in one embodiment, the bottom surface is only provided with a second main indentation, and in the folded state, the connecting surface is folded toward the inside of the bag body along the first main indentation and the auxiliary indentation, and the bottom surface is folded toward the inside of the bag body along the second main indentation.

[0015] During the folding process of the three-dimensional bag, the connecting surface and the bottom surface are folded toward the inner side of the bag body along the corresponding indentations, so as to reduce the space occupied by the three-dimensional bag after folding, making it easier to store and transport.

[0016] Furthermore, in one embodiment, the distance between the bending point on each first main indentation and the bottom surface in the height direction is between 1 / 3 and 2 / 3 of the width dimension of the connecting surface in the width direction, and the bending point is located within this range on the first main indentation. During the folding process of the three-dimensional bag, the connecting surface can form a stable supporting structure after folding, which helps to maintain the overall shape of the bag and prevent it from deformation during storage or transportation; and the user can fold the three-dimensional bag more smoothly and easily.

[0017] If the distance between the bending point on each first main indentation and the bottom surface in the height direction is less than 1 / 3 of the width dimension of the connecting surface in the width direction, when the bottom surface is bent along the second main indentation, the deformation of the part of the connecting surface located at the bending point close to the bottom surface after being bent along the first main indentation and the two auxiliary indentations will not be enough to offset the pulling caused by the deformation of the bottom surface, causing this part to bulge too much toward the outside of the bag body, affecting the folding effect; if the distance between the bending point on each first main indentation and the bottom surface in the height direction is greater than 2 / 3 of the width dimension of the connecting surface in the width direction, when the bottom surface is bent along the second main indentation, the deformation of the part of the connecting surface located at the bending point close to the bottom surface after being bent along the first main indentation and the two auxiliary indentations will be too large, which will pull the bottom surface, making it impossible to fold the bottom surface flat, also affecting the folding effect.

[0018] Specifically, the distance between the bending point on each first main indentation and the bottom surface in the height direction is 1 / 2 of the width dimension of the connecting surface in the width direction.

[0019] During the folding process of this three-dimensional bag, taking the bottom surface facing the inner side of the bag body as an example, the bottom surface is bent along the second main indentation in the width direction, and the portion of the connecting surface located at the bending point close to the bottom surface is bent along the first main indentation and two auxiliary indentations. The first main indentation on the connecting surface located at the bending point close to the bottom surface will fit with the corresponding second main indentation on the bottom surface and extend along the length direction. The first main indentation on the connecting surface located at the bending point away from the bottom surface extends along the height direction, and in the length direction, the folded side edges on the bottom surface are flush with the folded side edges of the corresponding connecting surface, that is, the portion of the connecting surface located on the side of the bending point close to the bottom surface just offsets the pulling of the bottom surface on the connecting surface caused by the bending of the bottom surface. On the one hand, the three-dimensional bag can be folded more smoothly and easily, and on the other hand, it helps to ensure that the various parts of the folded three-dimensional bag can fit tightly and reduce the possibility of gaps and protrusions. That is, the shape of the folded three-dimensional bag is more regular, so the storage space can be used more effectively.

[0020] In order to ensure that the bag body can be folded more smoothly along the indentation and avoid folding difficulties caused by material accumulation, a hollow portion is formed at the bending point on each first main indentation on the connecting surface.

[0021] In one embodiment, the hollow portion is configured as an opening that penetrates the connecting surface. Such a hollow portion has a simple shape, is easy to process, and can effectively promote the folding of the bag body.

[0022] In another embodiment, the hollow portion is configured as a cut extending from the bending point along at least one of the two auxiliary indentations and the first main indentation. This cut extending along the indentation can cause the connecting surface to produce a greater deformation along the indentation, better disperse the accumulation of materials, and provide greater folding flexibility and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a three-dimensional bag provided in an embodiment of the utility model in an unfolded state;

[0024] Figure 2 A schematic diagram of a three-dimensional bag provided by an embodiment of the utility model viewed along the length direction;

[0025] Figure 3 A schematic diagram of a three-dimensional bag provided by an embodiment of the utility model in a folded state viewed along the width direction;

[0026] Figure 4 A schematic diagram of the connection surface of the three-dimensional bag provided in an embodiment of the utility model at the bending point;

[0027] Figure 5 Another schematic diagram of the connection surface of the three-dimensional bag provided in the embodiment of the utility model at the bending point;

[0028] Figure 6 A schematic diagram of a substrate for a three-dimensional bag provided in an embodiment of the utility model;

[0029] Figure 7 A schematic diagram of a three-dimensional bag provided in an embodiment of the utility model, wherein the bag opening folded edges are overlapped at the bag opening;

[0030] Figure 8 Another schematic diagram of a three-dimensional bag provided by an embodiment of the utility model viewed along the length direction;

[0031] Fig. 9 Another schematic diagram of a substrate of a three-dimensional bag provided in an embodiment of the utility model;

[0032] Fig.10 A schematic diagram of the bottom surface of a three-dimensional bag provided by an embodiment of the utility model viewed from the height direction;

[0033] Fig.11 A schematic diagram of a substrate, a handle and a header of a three-dimensional bag provided in an embodiment of the utility model.

[0034] Description of reference numerals:

[0035] 10. Three-dimensional bag;

[0036] 100. Bag body;

[0037] 110, side surface; 120, connecting surface; 121, first main indentation; 122, auxiliary indentation; 123, bending point; 124, hollow part; 125, opening; 126, incision;

[0038] 130, bottom surface; 131, second main indentation;

[0039] 101, sub-connecting surface; 102, bonding portion; 103, bottom connecting portion; 104, bottom folding edge; 105, bottom folding edge of connecting surface; 106, bag opening folding edge; 107, opening; 108, head card;

[0040] 200, handle;

[0041] X, width direction; Y, length direction; Z, height direction;

[0042] a. The distance between the bending point and the bottom surface in the height direction;

[0043] b. The width of the connecting surface in the width direction. DETAILED DESCRIPTION

[0044] In the prior art, in order to facilitate folding, a plurality of complex and extended folds are formed on the bottom surface of the three-dimensional bag, thereby guiding the folding of the bottom surface. These complex folds will directly affect the structural strength of the bottom surface of the bag body, and deeper folds may weaken the load-bearing capacity of the bag body.

[0045] To this end, the utility model provides a three-dimensional bag, including a bag body with a accommodating cavity, the bag body including a pair of side surfaces spaced apart along the width direction of the three-dimensional bag, a bottom surface away from the bag opening side in the height direction of the three-dimensional bag, and a pair of connecting surfaces respectively connecting the pair of side surfaces and the bottom surface in the length direction of the bag body, the connecting surface of each side is formed with a first main indentation extending in the height direction in the middle of the width direction, the first main indentation is formed with an auxiliary indentation extending from the first main indentation relative to the height direction to the corresponding corner of the bottom surface near the bottom surface, and the bottom surface is formed with a second main indentation extending in the length direction in the middle of the width direction. The bag body of this three-dimensional bag can be folded along the first main indentation, the second main indentation and the auxiliary indentation, and the number of indentations on the bottom surface is reduced while ensuring that the three-dimensional bag can be folded smoothly, the folding process of the bottom surface is simplified, and the strength influence of the indentation on the bottom surface is reduced, so that the three-dimensional bag has the advantages of both bearing strength and folding convenience.

[0046] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0047] like Figure 1 As shown, an embodiment of the utility model discloses a three-dimensional bag 10, which includes a bag body 100 with a accommodating cavity, the bag body 100 includes a pair of side surfaces 110 spaced apart along the width direction X of the three-dimensional bag 10, a bottom surface 130 away from the bag opening side in the height direction Z of the three-dimensional bag 10, and a pair of connecting surfaces 120 respectively connecting the pair of side surfaces 110 and the bottom surface 130 in the length direction Y of the bag body 100.

[0048] The pair of side surfaces 110 of the bag body 100 are arranged at intervals along the width direction X of the three-dimensional bag 10, so that the bag body 100 has a certain degree of expansibility in the width direction X, and can accommodate wider or irregularly shaped items. The bottom surface 130, as the supporting part of the bag body 100, needs to have a high strength. On the one hand, when accommodating items, the bottom surface 130 is prevented from being squeezed and torn by the items; on the other hand, it is ensured that the three-dimensional bag 10 can maintain a stable standing state when placing items. The pair of connecting surfaces 120 are arranged at intervals along the length direction Y of the three-dimensional bag 10, and it is necessary to ensure the connection strength between the pair of side surfaces 110 and between the pair of side surfaces 110 and the bottom surface 130. The bag body 100 also has a certain degree of ductility and stability in the length direction Y, and can better adapt to items of different lengths or volumes. Through the above structure, the bag body 100 is arranged in a rectangular storage space in the unfolded state, which can hold more items.

[0049] It should be noted that, in the present embodiment, the bag body 100 may be made of non-woven fabric, or may be made of paper or paper-like materials, and the present invention does not make any sole limitation to this.

[0050] Specifically, in the present embodiment, a first main indentation 121 extending along the height direction Z is formed in the middle of each connecting surface 120 in the width direction X, and a second main indentation 131 extending along the length direction Y is formed in the middle of the bottom surface 130 in the width direction X; and, on each connecting surface 120, two auxiliary indentations 122 are formed at a portion of the first main indentation 121 close to the bottom surface 130, and each auxiliary indentation 122 extends obliquely from the first main indentation 121 relative to the height direction Z to a corresponding corner of the bottom surface 130.

[0051] Moreover, in the folded state, the bag body 100 is folded along the first main indentation 121, the second main indentation 131 and the auxiliary indentation 122. Therefore, the three-dimensional bag 10 forms the first main indentation 121 and the auxiliary indentation 122 on the connecting surface 120, and only forms the second main indentation 131 on the bottom surface 130, thereby guiding the folding of the three-dimensional bag 10. Since the three-dimensional bag 10 sets more indentations on the connecting surface 120 and only a single second main indentation 131 is set on the bottom surface 130, the complex folding is transferred to the connecting surface 120 of the three-dimensional bag 10, and the bottom surface 130 only needs to be folded in half along the second main indentation 131.

[0052] Compared with the prior art, in which a plurality of auxiliary creases are required on the bottom surface 130 to guide the folding of the bottom surface 130, this three-dimensional bag 10 reduces the number of indentations on the bottom surface 130 while ensuring that the three-dimensional bag 10 can be folded smoothly, simplifies the folding process of the bottom surface 130, and reduces the influence of the indentations on the strength of the bottom surface 130, so that the three-dimensional bag 10 can have both high load-bearing strength and folding convenience.

[0053] In addition, since only a second main indentation 131 extending along the length direction Y is provided on the bottom surface 130, even in the unfolded state, it will not have a significant impact on the bottom surface 130, ensuring that the three-dimensional bag 10 can be supported flatly by the bottom surface 130, thereby improving the placement stability of the three-dimensional bag 10 in the unfolded state.

[0054] Furthermore, in order to make the three-dimensional bag 10 more convenient and stable to fold, in one embodiment, when viewed along the length direction Y of the three-dimensional bag 10, the first main indentation 121 and the second main indentation 131 extend continuously with each other. This continuity ensures that the bag body 100 can form a stable structure along the two main indentations when folded, thereby avoiding the looseness of the three-dimensional bag 10 after folding or irregular folding of the three-dimensional bag 10 (for example, the three-dimensional bag 10 cannot bend according to the predetermined indentation), thereby improving the folding stability of the three-dimensional bag 10.

[0055] In addition, two auxiliary indentations 122 are formed on the connecting surface 120 on each side near the bottom surface 130. On the connecting surface 120 on each side, the two auxiliary indentations 122 extend obliquely from the same bending point 123 of the first main indentation 121 toward the bottom surface 130, and the two auxiliary indentations 122 extend symmetrically relative to the first main indentation 121. When viewed along the length direction, the two auxiliary indentations 122 are in an inverted V shape.

[0056] During the folding process, the bottom surface 130 of the three-dimensional bag 10 is folded in half along the second main indentation 131, and the portion of the connecting surface 120 close to the ground will be squeezed or pulled by the bent bottom surface 130, and guided by the two auxiliary indentations 122 to bend along the two auxiliary indentations 122, that is, the connecting surface 120 is located at the side of the bending point 123 away from the bottom surface 130, and will bend along the first main indentation 121; and the connecting surface 120 is located at the side of the bending point 123 close to the bottom surface 130, and will bend along the two auxiliary indentations 122 and the first main indentation 121. The main indentation 121 is bent regularly, and the two auxiliary indentations 122 intersect at the same bending point 123 of the first main indentation 121 and extend obliquely toward the bottom surface 130. This inclined design helps to guide the material during the folding process so that it can fit together more smoothly and tightly; and the two auxiliary indentations 122 extend symmetrically relative to the first main indentation 121, which can ensure that the folded bag body 100 is more balanced and stable in structure, and avoid irregular folding caused by the bending of the bottom surface 130 on the connecting surface 120.

[0057] Furthermore, in one embodiment, the bottom surface 130 is only provided with a second main indentation 131, and in the folded state, the connecting surface 120 is folded along the first main indentation 121 and the auxiliary indentation 122 toward the inner side of the bag body 100, and the bottom surface 130 is folded along the second main indentation 131 toward the inner side of the bag body 100.

[0058] During the folding process of the three-dimensional bag 10 , the connecting surface 120 and the bottom surface 130 are folded toward the inside of the bag body 100 along the corresponding indentations, so as to reduce the space occupied by the three-dimensional bag 10 after being folded, making it easier to store and transport.

[0059] Of course, the folding method of the three-dimensional bag 10 is not limited to the method specified in the above embodiment. In another alternative embodiment, a redundant part is formed on the connecting surface 120 close to the bottom surface 130, and the connecting surface 120 is folded toward the inside of the bag body 100 along the first main indentation 121 and the auxiliary indentation 122, while the bottom surface 130 is folded toward the outside of the bag body 100 along the second main indentation 131; or the connecting surface 120 is folded toward the outside of the bag body 100 along the first main indentation 121 and the auxiliary indentation 122, while the bottom surface 130 is folded toward the outside of the bag body 100 along the second main indentation 131. This embodiment does not make a sole limitation on this.

[0060] Further, in one embodiment, Figure 2 As shown, the distance a between the bending point 123 on each first main indentation 121 and the bottom surface 130 in the height direction Z is between 1 / 3 and 2 / 3 of the width dimension b of the connecting surface 120 in the width direction X. Specifically, the distance a between the bending point 123 and the bottom surface 130 in the height direction Z is 1 / 3, 4 / 9, 1 / 2, 7 / 12, 2 / 3 or other proportions of the width dimension b of the connecting surface 120 in the width direction X. Those skilled in the art can design it according to actual conditions and specific needs, and this embodiment does not make a sole limitation on this.

[0061] It should be noted that the bending point 123 on the first main indentation 121 is located within this range. During the folding process of the three-dimensional bag 10, the connecting surface 120 can form a stable supporting structure after folding, which helps to maintain the overall shape of the bag and prevent it from deforming during storage or transportation; and the user can fold the three-dimensional bag 10 more smoothly and easily.

[0062] If the distance a between the bending point 123 and the bottom surface 130 in the height direction Z is less than 1 / 3 of the width dimension b of the connecting surface 120 in the width direction X, when the bottom surface 130 is bent along the second main indentation 131, the portion of the connecting surface 120 located at the bending point 123 close to the bottom surface 130 is bent along the first main indentation 121 and the two auxiliary indentations 122, and the deformation generated is insufficient to offset the pulling generated by the deformation of the bottom surface 130, causing the portion to bulge too much toward the outside of the bag body 100, affecting the Folding effect: If the distance a between the bending point 123 and the bottom surface 130 in the height direction Z is greater than 2 / 3 of the width dimension b of the connecting surface 120 in the width direction X, when the bottom surface 130 is bent along the second main indentation 131, the portion of the connecting surface 120 located at the bending point 123 close to the bottom surface 130 is bent along the first main indentation 121 and the two auxiliary indentations 122. The deformation is too large, which pulls the bottom surface 130, making it impossible to fold flat, which also affects the folding effect.

[0063] Specifically, in one embodiment, Figure 2 As shown, the distance a between the bending point 123 on each first main indentation 121 and the bottom surface 130 in the height direction Z is 1 / 2 of the width dimension b of the connecting surface 120 in the width direction X.

[0064] like Figure 3 As shown, during the folding process of the three-dimensional bag 10, taking the bottom surface 130 facing the inner side of the bag body 100 as an example, the bottom surface 130 is bent along the second main indentation 131 in the width direction X, and after the connecting surface 120 is bent along the first main indentation 121 and the two auxiliary indentations 122, the first main indentation 121 on the connecting surface 120 located at the bending point 123 close to the bottom surface 130 will be in contact with the corresponding second main indentation 131 on the bottom surface 130, and both extend along the length direction Y, and the first main indentation 121 on the connecting surface 120 located at the bending point 123 away from the bottom surface 130 extends along the height direction Z, Moreover, in the length direction Y, the folded side edges on the bottom surface 130 are flush with the folded side edges of the corresponding connecting surface 120, that is, the portion of the connecting surface 120 located at the bending point 123 close to the bottom surface 130 just offsets the pulling of the connecting surface 120 caused by the bending of the bottom surface 130. On the one hand, it allows the three-dimensional bag 10 to be folded more smoothly and easily, and on the other hand, it helps to ensure that all parts of the folded three-dimensional bag 10 can fit tightly and reduce the possibility of gaps and protrusions. That is, the shape of the folded three-dimensional bag 10 is more regular, so the storage space can be used more effectively.

[0065] In order to ensure that the bag body 100 can be folded more smoothly along the indentation and avoid folding difficulties caused by material accumulation, a hollow portion 124 is formed at the bending point 123 on each first main indentation 121 on the connecting surface 120 .

[0066] In one embodiment, if Figure 4 As shown, the hollow portion 124 is configured as an opening 125 that penetrates the connecting surface 120 . The hollow portion 124 has a simple shape, is easy to process, and can effectively promote the folding of the bag body 100 .

[0067] In another embodiment, the hollow portion 124 is configured as a cutout 126 extending from the bending point 123 along at least one of the two auxiliary indentations 122 and the first main indentation 121. Figure 5 As shown, the hollow portion 124 is configured as a cutout 126 extending from the bending point 123 along the two auxiliary indentations 122 and the first main indentation 121 respectively. Of course, the hollow portion 124 can also be configured as a cutout 126 extending from the bending point 123 along the two auxiliary indentations 122, or can be configured as a cutout 126 extending from the bending point 123 along the first main indentation 121. This embodiment does not make a sole limitation on this.

[0068] The cutout 126 extending along the indentation can cause the connecting surface 120 to have a greater deformation along the indentation, better disperse the accumulation of materials, and provide greater folding flexibility and stability.

[0069] Regarding the specific limitation of the hollow portion 124 , this embodiment does not make a sole limitation thereto, and technicians in this field may design it according to actual conditions and specific needs.

[0070] The connection method between the various surfaces of the three-dimensional bag 10 is described in detail below.

[0071] In one embodiment, a pair of side surfaces 110 of the three-dimensional bag 10 are connected to the bottom surface 130 on the side facing away from the bag opening in the height direction Z, and the two sides in the length direction Y are connected through corresponding connecting surfaces 120, and the connecting surface 120 is connected to the bottom surface 130 on the side facing away from the bag opening in the height direction Z.

[0072] Specifically, a pair of side surfaces 110 are provided with sub-connecting surfaces 101 on both sides of the length direction Y, and one of the sub-connecting surfaces 101 located on the same side of the length direction Y extends at the edge of the width direction X to form a bonding portion 102, and the bonding portion 102 is connected to the overlapping portion of the other sub-connecting surface 101 to form connecting surfaces 120 on both sides of the side surface 110, and the connecting surface 120 and the bottom surface 130 are connected by a bottom connecting portion 103.

[0073] In one embodiment, if Figure 6As shown, the two sub-connecting surfaces 101 located on the same side of a pair of side surfaces 110 are symmetrically arranged, the two sub-connecting surfaces 101 are bent toward each other, the side edges of the two sub-connecting surfaces 101 are connected to each other, and the side edge of one of the sub-connecting surfaces 101 extends at the edge of the width direction X to form a bonding portion 102, and the bonding portion 102 overlaps the other sub-connecting surface 101 to facilitate the connection of the two sub-connecting surfaces 101. At this time, the position where the two sub-connecting surfaces 101 are connected coincides with the first main indentation 121. Regarding the connection method of the two sub-connecting surfaces 101, glue bonding can be used, and this embodiment does not make specific limitations on this.

[0074] Of course, the two sub-connecting surfaces 101 can also be set asymmetrically. For example, the width of one of the sub-connecting surfaces 101 is twice the width of the other sub-connecting surface 101. It is only necessary to ensure that after the two sub-connecting surfaces 101 are bent toward each other, the side edges of the two sub-connecting surfaces 101 can be connected, thereby realizing the connection of the two sub-connecting surfaces 101. At this time, the position where the two sub-connecting surfaces 101 are connected is staggered with the first main indentation 121, and the present invention does not make a sole limitation on this.

[0075] During the manufacturing process of the three-dimensional bag 10, the substrate (such as paper) needs to be cut into a predetermined shape, such as Figure 6 As shown, the substrate sequentially forms a side surface 110, a bottom surface 130 and another side surface 110 of the bag body 100, and each side surface 110 forms a connecting surface 101 on both sides of the width direction X. Then, the substrate needs to be folded to enclose and form a bag body 100 with a containing cavity.

[0076] Furthermore, since the opening of the three-dimensional bag 10 is directly formed by the top of the side wall of the bag body 100, it is made of the same material as the side wall of the bag body 100 and is open to the outside, its own strength is relatively low, and objects are also put in and out through the opening. In order to improve the strength of the opening of the three-dimensional bag 10, in one embodiment, Figure 6 As shown, a pair of side surfaces 110 and a pair of connecting surfaces 120 have a bag opening folded edge 106 bent into the accommodating cavity on the side facing away from the bottom surface 130 in the height direction Z of the bag body 100, and the opposite ends of one sub-connecting surface 101 and the corresponding bag opening folded edge 106 and another sub-connecting surface 101 and the corresponding bag opening folded edge 106 are plugged into each other to form a bag opening folded edge 106 that continuously surrounds the bag opening, thereby greatly enhancing the strength of the bag opening.

[0077] Therefore, on the base material forming the bag body 100 , the side of each side surface 110 facing away from the bottom surface 130 needs to be folded toward the inner surface of the side surface 110 to preliminarily form the bag opening fold 106 .

[0078] Then, the pair of side surfaces 110 need to be bent toward each other, and the sub-connection surfaces 101 on the same side of the pair of side surfaces 110 need to be bent toward each other, so that the bonding portion 102 of one sub-connection surface 101 overlaps with the other sub-connection surface 101 .

[0079] Furthermore, in order to achieve the insertion of the bag opening fold 106 at the bonding portion 102, it is necessary to stagger the two sub-connection surfaces 101 in the height direction Z of the bag body 100 to form a height difference, and then insert the bonding portion 102 and the corresponding bag opening fold 106 between the other sub-connection surface 101 and the corresponding bag opening fold 106, or insert the other sub-connection surface 101 and the corresponding bag opening fold 106 between the bonding portion 102 and the corresponding bag opening fold 106. Then, one sub-connection surface 101 is connected to the other sub-connection surface 101 through the bonding portion 102 to form a connection surface 120, and the connection surface 120 is connected to the bottom surface 130 through the bottom connection portion 103.

[0080] The side of each side surface 110 facing away from the bottom surface 130 is bent to form the bag opening fold 106, which can be performed before or after the pair of side surfaces 110 are bent. The utility model does not make a sole limitation on this.

[0081] It should be noted that the parts on the bag body 100 that need to be connected can be fixed by gluing, heat sealing, or the like. For example, when the material of the bag body 100 is non-woven fabric, it can be connected by heat sealing. For another example, when the material of the bag body 100 is paper material, it can be connected by bonding. The present invention does not make any specific limitation on this.

[0082] like Figure 7 As shown, in order to make the pocket folds 106 on the two sub-connecting surfaces 101 plug into each other more smoothly and tightly, when viewed along the height direction Z of the bag body 100, the pocket fold 106 of one sub-connecting surface 101 and / or the pocket fold 106 of the other sub-connecting surface 101, its side edge extends obliquely from the end away from the bending area toward the side away from the bonding portion 102. That is to say, optionally, the side edge of the pocket fold 106 of one sub-connecting surface 101 extends obliquely from the end away from the bending area toward the side away from the bonding portion 102, and the side edge of the pocket fold 106 of the other connecting surface 120 extends along the height direction Z of the bag body 100, or the side edges of the pocket fold 106 of one sub-connecting surface 101 and the pocket fold 106 of the other sub-connecting surface 101 extend obliquely from the end away from the bending area toward the side away from the bonding portion 102.

[0083] Therefore, after the pocket fold 106 is folded, the offset distance of the pocket fold 106 on the two sub-connecting surfaces 101 in the height direction Z can be greatly reduced, which not only simplifies the production process, but also improves production efficiency and product quality.

[0084] In addition, the obliquely extended bag opening fold 106 also reduces the overlapping thickness of the bag opening fold 106 at the insertion position, making the bag body 100 flatter and facilitating the folding of the packaging bag.

[0085] Of course, the inclination angle of the side edge of the pocket fold 106 of the sub-connecting surface 101 relative to the height direction Z of the bag body 100 is between 15° and 75°, for example, it can be 15°, 30°, 35°, 40°, 45°, 60°, 75° or any other angle within the above angle range. It should be noted that if the inclination angle of the side edge of the pocket fold 106 relative to the height direction Z of the bag body 100 exceeds 75°, the overlapping and plugging parts of the two pocket folds 106 are small, and the effect of strengthening the connection strength cannot be played. If the inclination angle of the side edge of the pocket fold 106 relative to the height direction Z of the bag body 100 is less than 15°, the pocket folds 106 of the two sub-connecting surfaces 101 still need to stagger a large height difference in the height direction Z during the plugging process, and the difficulty of the plugging operation cannot be simplified.

[0086] Of course, the operation of plugging the pocket folds 106 on the two sub-connecting surfaces 101 is not limited to the above-mentioned embodiment, and the method of making the two pocket folds 106 have a height difference in the height direction Z can also be performed by manually opening one of the pocket folds 106 from the side edge and then inserting the other pocket fold 106. This embodiment does not make a sole limitation on this.

[0087] Further, if Figure 1 As shown, in order to make it easier for users to carry, the packaging bag further includes a pair of handles 200 at the bag opening of the bag body 100, respectively fixed to the pair of side surfaces 110. The handles 200 are ropes with an oblate or circular cross section, or are sheet structures cut into a U shape, which is not specifically limited in this embodiment.

[0088] Further, if Figure 6 As shown, when a bag opening fold 106 is formed around the bag opening of the packaging bag, an opening 107 is formed on the bag opening fold 106 of each side surface 110 at a position corresponding to the two free ends of the handle 200 .

[0089] Specifically, in one embodiment, Figure 6 and Fig.11As shown, the free end of each handle 200 extends from the inner side of the bag body 100 into the corresponding opening 107 and extends to between the bag fold 106 and the side 110. When the bag fold 106 is bent toward the side 110, the free end of the handle 200 is fixedly connected to the inner surface of the bag fold 106 and the inner surface of the side 110.

[0090] It should be noted that, in order to improve the connection strength between the handle 200 and the bag body 100, the two free ends of the handle 200 extending into the opening 107 are bent and extended in a direction away from each other, bent and extended in a direction close to each other, or arranged in any one of spiral bending and extending shapes, and the present invention does not make specific limitations on this.

[0091] Regarding improving the connection strength between the handle 200 and the bag body 100, not only can the actual connection area 120 between the end of the handle 200 and the bag body 100 be increased, in another embodiment, such as Fig.11 As shown, a head card 108 can be provided between a pair of side surfaces 110 and the corresponding bag opening fold 106 , at the two free ends of the handle 200 , and in the height direction Z, the head card 108 is closer to the bottom surface 130 than the opening 107 .

[0092] Regarding the configuration of the header card 108, in one embodiment, Fig.11 As shown, before the bag fold 106 is folded inward, the head clip 108 is connected to the inner surface of the side surface 110 until the bag fold 106 is folded inward, and the free end of the handle 200 is fixedly connected between the head clip 108 and the bag fold 106.

[0093] In another embodiment, the header clip 108 is connected to the inner surface of the bag opening fold 106 , and the free end of the handle 200 is fixedly connected between the side surface 110 and the header clip 108 .

[0094] In this embodiment, the header 108 disposed between the ends of the bag body 100 and the handle 200 can strengthen the connection strength between the bag body 100 and the handle 200, and can also enhance the strength of the bag opening.

[0095] Regarding the connection method between the connection surface 120 and the bottom surface 130, as shown in FIG. Figure 6 and Figure 8 As shown, in one embodiment, the bottom connecting portion 103 is configured as a bottom folded edge 104 formed at the end of the bottom surface 130 in the length direction Y.

[0096] Among them, when the bottom surface 130 is connected to the connecting surface 120 through the bottom surface folded edge 104, the bottom surface folded edge 104 can be bent toward the connecting surface 120 so that it extends into the inner side of the connecting surface 120 close to the accommodating cavity and is connected to the inner surface of the connecting surface 120; in another embodiment, the bottom surface folded edge 104 can also be bent toward the connecting surface 120 so that the bottom surface folded edge 104 is located on the outer side of the connecting surface 120 away from the accommodating cavity and is connected to the outer surface of the connecting surface 120.

[0097] Furthermore, in the height direction Z, the spacing between the two side edges of the bottom fold 104 gradually decreases from the end connected to the bottom surface 130, so that the contour shape of the bottom fold 104 is trapezoidal. The spacing of the trapezoidal bottom fold 104 in the width direction X is narrower than the spacing of the connecting surface 120. On the premise of ensuring the connection strength between the bottom surface 130 and the connecting surface 120, the risk of the bottom fold 104 being misaligned when connected to the connecting surface 120 is reduced. At the same time, during the production process, the positioning accuracy requirements between the trapezoidal bottom fold 104 and the connecting surface 120 are reduced, which reduces the difficulty of producing the packaging bag. In addition, this trapezoidal structure reduces the accumulation of sheet material on the connecting surface 120, which is located at the bending point 123 close to the bottom side, which is conducive to smoother folding of the bag body 100.

[0098] In another embodiment, if Fig. 9 and Fig.10 As shown, the bottom connection portion 103 is configured as a connection surface bottom fold 105 formed at one end of the connection surface 120 close to the bottom surface 130 in the height direction Z. Specifically, a portion of the connection bottom fold 104 is formed on each of the two sub-connection surfaces 101. When the two sub-connection surfaces 101 are connected by the bonding portion 102, the connection surface bottom fold 105 on the two sub-connection surfaces 101 is also connected by the bonding portion 102, thereby forming the entire connection bottom fold 104.

[0099] Of course, it should be noted that the connection surface bottom fold 105 disposed on the connection surface 120 can also be configured to have a trapezoidal structure like the bottom surface fold 104 , and this embodiment does not make the sole limitation to this.

[0100] Furthermore, in order to increase the carrying capacity of the packaging bag, in one embodiment, a bottom card (not shown in the figure) matching the shape of the bottom surface 130 is provided on the inner surface of the bottom surface 130 in the accommodating cavity.

[0101] The bottom card can be connected to the bottom surface 130 of the bag body 100 by adhesive bonding, or can be simply placed on the bottom surface 130, thereby sharing the pressure of the items in the cavity on the bottom surface 130 and improving the carrying capacity of the packaging bag.

[0102] It should be noted that, in addition to the implementation methods of the utility model described in the above-mentioned specific specific embodiments, those skilled in the art can easily understand other advantages and functions of the utility model from the contents disclosed in this specification. Although the description of the utility model is introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation method. On the contrary, the purpose of introducing the utility model in conjunction with the implementation method is to cover other options or modifications that may be extended based on the claims of the utility model. In order to provide an in-depth understanding of the utility model, the above description contains many specific details, and the utility model can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the utility model, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the utility model and the features in the embodiments can be combined with each other.

[0103] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0104] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0105] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0106] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0107] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A three-dimensional bag, characterized in that: The bag body comprises a bag having a cavity, wherein the bag body comprises a pair of side surfaces spaced apart in the width direction of the three-dimensional bag, a bottom surface away from a bag opening in the height direction of the three-dimensional bag, and a pair of connecting surfaces respectively connecting the pair of side surfaces and the bottom surface in the length direction of the bag body; wherein: A first main indentation extending along the height direction is formed in the middle of the connecting surface on each side in the width direction, and a second main indentation extending along the length direction is formed in the middle of the bottom surface in the width direction; and, on the connecting surface on each side, an auxiliary indentation is formed at a portion of the first main indentation close to the bottom surface, which extends obliquely from the first main indentation relative to the height direction to the corresponding corner of the bottom surface; and, in the folded state, the bag body is folded along the first main indentation, the second main indentation and the auxiliary indentation.

2. The three-dimensional bag according to claim 1, characterized in that: When viewed along the length direction of the three-dimensional bag, the first main indentation and the second main indentation extend continuously with each other; and two auxiliary indentations are formed at the portion of the connecting surface on each side close to the bottom surface; wherein, On the connecting surface on each side, the two auxiliary indentations extend obliquely from the same bending point of the first main indentation toward the bottom surface and extend symmetrically with respect to the first main indentation.

3. The three-dimensional bag according to claim 2, characterized in that: The bottom surface is only provided with the second main indentation, and in the folded state, the connecting surface is folded toward the inner side of the bag body along the first main indentation and the auxiliary indentation, and the bottom surface is folded toward the inner side of the bag body along the second main indentation.

4. The three-dimensional bag according to claim 2, characterized in that: The distance between the bending point on each of the first main indentations and the bottom surface in the height direction is between 1 / 3 and 2 / 3 of the width dimension of the connecting surface in the width direction.

5. The three-dimensional bag according to claim 4, characterized in that: The distance between the bending point on each of the first main indentations and the bottom surface in the height direction is 1 / 2 of the width dimension of the connecting surface in the width direction.

6. The three-dimensional bag according to claim 2, characterized in that: On the connecting surface, a hollow portion is formed at the bending point on each of the first main indentations.

7. The three-dimensional bag according to claim 6, characterized in that: The hollow portion is configured as: an opening that passes through the connecting surface; or, A cut extending from the bending point along at least one of the two auxiliary indentations and the first main indentation.

8. The three-dimensional bag according to any one of claims 1 to 7, characterized in that: The pair of side surfaces are provided with sub-connecting surfaces on both sides of the length direction, and one of the sub-connecting surfaces located on the same side of the length direction extends from the edge in the width direction to form a bonding portion, and the bonding portion is overlapped with the other sub-connecting surface and connected to form the connecting surface on the corresponding side, and the connecting surface and the bottom surface are connected via a bottom connecting portion.

9. The three-dimensional bag according to claim 8, characterized in that: The bottom connection portion is configured as: a bottom fold formed at the end of the bottom surface in the length direction; wherein The bottom folded edge is bent toward the connecting surface, extends into the inner side of the connecting surface close to the accommodating cavity, and is connected to the inner surface of the connecting surface; or, The bottom folded edge is bent toward the connecting surface, located at the outer side of the connecting surface away from the accommodating cavity, and connected to the outer surface of the connecting surface.

10. The three-dimensional bag according to claim 8, characterized in that: The bottom connection portion is configured as: a bottom folded edge of the connection surface formed by one end of the connection surface close to the bottom surface in the height direction; wherein The bottom folded edge of the connecting surface is bent toward the bottom surface, extends into the inner side of the bottom surface close to the accommodating cavity, and is connected to the inner surface of the bottom surface; or, The bottom folded edge of the connecting surface is bent toward the bottom surface, is located at the outer side of the bottom surface away from the accommodating cavity, and is connected to the outer surface of the bottom surface.

11. The three-dimensional bag according to claim 8, characterized in that: The pair of side surfaces and the pair of connecting surfaces have a bag opening folded edge bent into the accommodating cavity on the side away from the bottom surface in the height direction of the bag body, and one of the sub-connecting surfaces and the corresponding bag opening folded edge are plugged into the opposite ends of the other sub-connecting surface and the corresponding bag opening folded edge.

12. The three-dimensional bag according to claim 11, characterized in that: The side edge of the pocket fold of one of the sub-connecting surfaces and / or the pocket fold of the other sub-connecting surface extends obliquely from the end away from the bending area toward the side away from the bonding portion.

13. The three-dimensional bag according to claim 11, characterized in that: It also includes a pair of handles arranged at the opening of the bag body and respectively fixed to the pair of side surfaces, and an opening is formed on the bag opening fold of each of the side surfaces at positions corresponding to the two free ends of the handles; wherein The free end of each handle extends from the inner side of the bag body into the corresponding opening, extends to between the bag opening fold and the side surface, and is fixedly connected to the inner surface of the bag opening fold and the inner surface of the side surface.

14. The three-dimensional bag according to claim 13, characterized in that: A head clip is provided between the pair of side surfaces and the corresponding bag opening folded edges and at the two free ends of the handle, and in the height direction, the head clip is closer to the bottom surface than the opening; wherein, The head clip is connected to the inner surface of the side surface, and the free end of the handle is fixedly connected between the head clip and the bag opening fold; or, The head clip is connected to the inner surface of the bag opening fold, and the free end of the handle is fixedly connected between the side surface and the head clip.

15. The three-dimensional bag according to any one of claims 1 to 7, characterized in that: The bag body is made of non-woven fabric or paper material.

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