Three-dimensional bag

Abstract

The present invention discloses a three-dimensional bag, which comprises a bag body. The bag body includes a pair of front faces oppositely arranged in the thickness direction of the bag body, a pair of side faces oppositely arranged in the width direction of the bag body, and a bottom face arranged at the bottom of the bag body along the height direction of the bag body. And a bag opening is formed at the top of the bag body; multiple bottom crease lines are formed on the bottom face, and at least two of the multiple bottom crease lines extend crosswise with each other and form a crease intersection part at the intersection position, and the bottom face includes multiple crease intersection parts; moreover, at least one crease intersection part is provided with a bending opening penetrating the bottom face; by arranging the bending opening, a buffer area for reducing stress concentration is formed, so that the stress is more evenly distributed around the opening instead of concentrating at a single intersection point, avoiding the problem that the intersection position bulges when the crease lines intersect and the bottom face deforms due to uneven stress; thereby ensuring the aesthetics of the three-dimensional bag after folding and improving the yield of the three-dimensional bag.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging bags, and particularly to a three-dimensional bag. Background Art

[0002] A three-dimensional bag is a packaging bag with various shapes and functions, and is widely used in the packaging of various products. For example, three-dimensional bags can be used for food packaging, electronic product packaging, agricultural product packaging, etc. Moreover, there are many types of three-dimensional bags, including paper bags, kraft paper bags, non-woven bags, etc.

[0003] In the prior art, when producing three-dimensional bags, a three-dimensional bag forming machine is usually used to produce three-dimensional bags. A three-dimensional bag forming machine is a device for producing three-dimensional bags, mainly used for manufacturing various paper bags and non-woven bags, such as environmental protection bags, takeaway bags, wine bags, shoe bags, etc. These machines usually combine optoelectronics, ultrasonic welding technology and PLC control, and can realize automated production, improving efficiency and product quality.

[0004] However, in the process of making a three-dimensional bag by the prior art three-dimensional bag forming machine, after the three-dimensional bag is formed by the three-dimensional bag forming machine, generally, the three-dimensional bag needs to be packed. During the packing process of the three-dimensional bag, the three-dimensional bag needs to be folded so that the three-dimensional bag occupies less space.

[0005] Specifically, during the gradual folding process of the three-dimensional bag, multiple crease lines will be formed on the bottom surface when the bottom surface of the three-dimensional bag is folded. Moreover, since the side surfaces need to be folded inwards when the three-dimensional bag is folded, at least two of the multiple crease lines will have intersections at the bottom surface; however, due to the existence of shear force and compressive force during the folding process of the bottom surface, stress concentration will occur at the intersection of the crease lines, resulting in protrusions at the intersection of the crease lines, and due to the stress concentration at the intersection of the crease lines, the position of the crease lines will shift during the formation process, causing deformation of the bottom surface, thereby affecting the aesthetics and the yield rate of the three-dimensional bag.

[0006] Therefore, in the prior art, during the gradual folding process of the three-dimensional bag, stress concentration will occur at the intersection of the crease lines on the bottom surface, resulting in protrusions at the intersection of the crease lines, and due to the stress concentration at the intersection of the crease lines, the position of the crease lines will shift during the formation process, causing deformation of the bottom surface, thereby affecting the aesthetics and the yield rate of the three-dimensional bag. Summary of the Invention

[0007] The object of the present invention is to solve the problem that in the prior art, during the gradual folding of a three-dimensional bag, stress concentration occurs at the intersection of the crease lines on the bottom surface, resulting in a bulge at the intersection of the crease lines, and due to the stress concentration at the intersection of the crease lines, the position of the crease line shifts during formation, causing deformation of the bottom surface, thereby affecting the aesthetics and the yield rate of the three-dimensional bag.

[0008] To solve the above problems, the present invention provides a three-dimensional bag. Multiple bottom crease lines are formed on the bottom surface. At least two of the multiple bottom crease lines cross and extend each other and form a crease intersection at the crossing position. The bottom surface includes multiple crease intersections; and at least one crease intersection is provided with a bending opening penetrating the bottom surface; thereby changing the geometric structure at the intersection by the bending opening, arranging the bending opening at the original intersection of the bottom crease lines, and the bending opening can prevent the bottom crease lines from directly converging at one point, thus dispersing the stress; and further ensuring the aesthetics of the three-dimensional bag after folding and improving the yield rate of the three-dimensional bag.

[0009] The technical solution adopted by the present invention to solve the above problems is: a three-dimensional bag, including a bag body. The bag body includes a pair of front faces oppositely arranged in the thickness direction of the bag body, a pair of side faces oppositely arranged in the width direction of the bag body, and a bottom surface arranged at the bottom of the bag body along the height direction of the bag body, and a bag opening is formed at the top of the bag body.

[0010] Furthermore, multiple bottom crease lines are formed on the bottom surface. At least two of the multiple bottom crease lines cross and extend each other and form a crease intersection at the crossing position. The bottom surface includes multiple crease intersections; and at least one crease intersection is provided with a bending opening penetrating the bottom surface; on the one hand, changing the geometric structure at the intersection of the bottom crease lines by the bending opening, turning the original intersection of the bottom crease lines into a bending opening, and the bending opening can prevent the bottom crease lines from directly converging at one point, thus dispersing the stress; on the other hand, by arranging the bending opening to form a buffer area for reducing stress concentration, so that the stress is more evenly distributed around the opening instead of concentrating at a single intersection, avoiding the bulge at the intersection position when the bottom crease lines intersect and the problem of bottom surface deformation due to uneven stress; thereby ensuring the aesthetics of the three-dimensional bag after folding and improving the yield rate of the three-dimensional bag.

[0011] Further, in an embodiment of the three-dimensional bag, in order to make the stress at the intersection of multiple bottom crease lines more evenly dispersed, the bending opening is set as a hole opened in the corresponding crease intersection, and the hole is opened at the center position of the crease intersection, so that when multiple bottom crease lines intersect, due to the hole being at the center position of the crease intersection, the stress is more evenly distributed, reducing the risk of crease line offset caused by uneven stress distribution.

[0012] Further, to enable the bottom surface of the three-dimensional bag to be accurately folded into a preset shape during the folding process, in an embodiment of the three-dimensional bag, when looking at the bottom surface along the bottom, the cross-over portions of multiple creases on the bottom surface are symmetrically distributed with respect to the center line in the width direction of the bag body, and at least a pair of bending openings symmetrically distributed with respect to the center line are provided.

[0013] Further, when the bottom surface of the three-dimensional bag is folded, since the side surfaces need to be folded inwards, in an embodiment of the three-dimensional bag, a pair of front surfaces are connected by a pair of side surfaces. Each side surface includes two side sub-surfaces, and the opposite edges of the two side sub-surfaces at least partially overlap and lap in the thickness direction of the three-dimensional bag. Both sides of the bottom surface are respectively connected to a corresponding side surface through bottom edge bindings; wherein, a side pressing crease line extending in the height direction of the bag body is formed at the overlapping portion of each side surface; the bottom crease line includes a middle part in the thickness direction of the bottom surface, a middle bottom crease line extending in the width direction, and two V-shaped crease lines on both sides of the bottom surface close to the bottom edge binding. The inner end of each V-shaped crease line intersects with the middle bottom crease line; and a corresponding bending opening is provided at the crease cross-over portion formed by the intersection of the middle bottom crease line and the inner end of each V-shaped crease line.

[0014] With the above technical solution, a side pressing crease line extending in the height direction of the bag body is formed at the overlapping portion of each side surface. During the process of packing the three-dimensional bag, the side surface can be folded along the side pressing crease line, avoiding the risk of deformation of the side surface during the folding process; and, by providing bottom edge bindings to connect the bottom surface and the side surface, the area where the bottom surface and the side surface are connected to each other is larger, thereby enhancing the structural strength of the three-dimensional bag.

[0015] Moreover, when folding the three-dimensional bag, it can be gradually folded along the middle bottom crease line, the two V-shaped crease lines, and the side pressing crease line. And since there are two V-shaped crease lines on the bottom surface, the side surface can be folded towards the inside of the three-dimensional bag in the width direction, thus reducing the storage space of the three-dimensional bag; in addition, when tying multiple folded three-dimensional bags with a binding strap, the amount of the binding strap used will also be reduced, thereby reducing the packing cost of the three-dimensional bag.

[0016] Further, to ensure the aesthetic appearance of the three-dimensional bag during the forming process, in an embodiment of the three-dimensional bag, bottom edge bindings are provided on both sides of the bottom surface, and the bottom surface is fixedly connected to the inner wall surfaces of the two side sub-surfaces through the bottom edge bindings, and; two first pressing crease lines extending in the thickness direction are provided at positions of the bottom edge bindings close to the bottom surface, and the two first pressing crease lines are spaced apart in the width direction and are parallel to each other.

[0017] Wherein, one of the two first pressing crease lines is located at the connection position between the bottom edge binding and the bottom surface, and the other first pressing crease line is located on the bottom edge binding and close to the bottom surface.

[0018] With the above technical solution, by setting two first indentation lines, when connecting the bottom edge wrappings arranged on both sides of the bottom surface to the inner wall surfaces of the respective two side split surfaces, the two side split surfaces are offset from the first indentation line located at the connection position between the bottom edge wrapping and the bottom surface in the height direction. After the three-dimensional bag is folded, the first indentation line located at the connection position between the bottom edge wrapping and the bottom surface is not adhered to the bottom of the two side split surfaces, but is connected to the bottom edges of the two side split surfaces through the first indentation line on the bottom edge wrapping, so that the bottom edges of the two side split surfaces do not directly overlap with the first indentation line located at the connection position between the bottom edge wrapping and the bottom surface, thus avoiding the problem of bulging in the area at the first indentation line located at the connection position between the bottom edge wrapping and the bottom surface when folding the three-dimensional bag. Moreover, when folding and connecting the bottom edge wrapping to the inner wall surfaces of the two side split surfaces, flat folding can be more easily achieved, the bottom of the folded three-dimensional bag is flatter, there is no redundant thickness protrusion, and the overall appearance is more beautiful.

[0019] Further, for facilitating the connection between the bottom surface and the side surface, in an embodiment of the three-dimensional bag, first avoidance openings are formed at both side edges of the bottom edge wrapping; and, along the height direction, the first avoidance openings gradually increase from the side edge of the bottom edge wrapping close to the bottom surface towards the side edge of the bottom edge wrapping away from the bottom surface.

[0020] With the above technical solution, when connecting the bottom edge wrappings arranged on both sides of the bottom surface to the inner wall surfaces of the respective two side split surfaces, since the two side split surfaces are not yet connected to each other at this time, therefore, the two side split surfaces will protrude from the bottom surface in the width direction. First avoidance openings are formed at both side edges of the bottom edge wrapping. When the bottom edge wrapping is turned over around the thickness direction, the first avoidance openings can avoid each other with the side split surfaces. When the bottom edge wrapping is turned over to be perpendicular to the bottom surface, and then the two side split surfaces are turned over around the height direction to approach each other until the edges of the two side split surfaces coincide with each other, at this time, the bottom edge wrapping and the inner wall surfaces of the two side split surfaces are fixedly connected. Therefore, first avoidance openings are formed at both side edges of the bottom edge wrapping, so that the bottom edge wrapping can avoid each other with the two side split surfaces during the folding process, facilitating folding.

[0021] Further, for facilitating the connection between the two side split surfaces, in an embodiment of the three-dimensional bag, bag mouth folding edges are formed at the tops of the two side split surfaces of the front surface and each side surface, and the bag mouth folding edges of the two side split surfaces are inserted and fixed to each other.

[0022] Moreover, third avoidance openings are formed at the positions of the bag mouth folding edges of the two side split surfaces of each side surface close to the side indentation line. Along the height direction, the third avoidance openings gradually decrease from the side edge of the bag mouth folding edge away from the top of the side split surface towards the side edge of the bag mouth folding edge close to the top of the side split surface.

[0023] With the above technical solution, during the forming process of the three-dimensional bag, when the two side dividing surfaces are inserted and fixed to each other, the two side dividing surfaces are flipped around the height direction to approach each other. Then, after the two side dividing surfaces approach the insertion position, one of the two side dividing surfaces only needs to move down a small distance in the height direction, and the two side dividing surfaces can be inserted into each other through the third avoidance openings corresponding to each of them, which has the advantage of convenient insertion.

[0024] Further, for the convenience of taking the three-dimensional bag during subsequent use; in an embodiment of the three-dimensional bag, two handle perforations are provided at a predetermined interval along the width direction of the upper edge of the bag mouth hem. The two ends of the handle pass through the respective handle perforations and are fixedly connected to both the front surface and the inner wall surface of the bag mouth hem; and, in the height direction, the handle perforations are close to the crease of the bag mouth hem.

[0025] Further, to enable the bag mouth of the three-dimensional bag to be closed during use, in an embodiment of the three-dimensional bag, it is provided that the three-dimensional bag further includes at least one buckle fixedly provided at the bag mouth hem.

[0026] With the above technical solution, by providing the buckle, during the use of the three-dimensional bag, the bag mouth of the three-dimensional bag can be closed by the buckle. Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of the three-dimensional bag provided by the invention embodiment in an unfolded state in one embodiment;

[0028] Figure 2 It is a schematic structural diagram of the three-dimensional bag provided by the invention embodiment in a three-dimensional folded state from the first perspective;

[0029] Figure 3 It is a partial schematic diagram of the bottom surface in one embodiment provided by the invention embodiment;

[0030] Figure 4 It is a partial schematic diagram of the bottom surface in another embodiment provided by the invention embodiment;

[0031] Figure 5 It is a schematic structural diagram of the three-dimensional bag provided by the invention embodiment in an unfolded state in another embodiment;

[0032] Figure 6 It is a schematic structural diagram of the three-dimensional bag provided by the invention embodiment in a three-dimensional folded state in one embodiment;

[0033] Figure 7 It is a partial schematic diagram of the bottom edge of the three-dimensional bag provided by the invention embodiment in an unfolded state in one embodiment;

[0034] Figure 8Schematic diagram of the three-dimensional bag provided by the embodiment of the present invention after being folded into a three-dimensional shape in another embodiment;

[0035] Figure 9 Partial schematic diagram of the bottom hem of the three-dimensional bag provided by the embodiment of the present invention in the unfolded state in another embodiment;

[0036] Figure 10 Schematic diagram of the three-dimensional structure of the three-dimensional bag provided by the embodiment of the present invention when two side dividing surfaces are offset in the height direction in one embodiment;

[0037] Figure 11 Partial schematic diagram of the three-dimensional bag provided by the embodiment of the present invention at the third avoidance opening in the unfolded state in another embodiment;

[0038] Figure 12 Schematic diagram of the three-dimensional structure of the three-dimensional bag provided by the embodiment of the present invention before two side dividing surfaces overlap in the height direction in one embodiment;

[0039] Figure 13 Schematic diagram of the three-dimensional structure of the three-dimensional bag provided by the embodiment of the present invention after two side dividing surfaces overlap in the height direction in one embodiment.

[0040] Explanation of reference numerals:

[0041] 1. Three-dimensional bag;

[0042] 10. Bag body;

[0043] 11. Front side;

[0044] 12. Side surface;

[0045] 120. Side dividing surface; 121. Side crease line;

[0046] 13. Bottom surface;

[0047] 130. Bottom crease line; 131. Middle bottom crease line; 132. V-shaped crease line; 133. Bending opening; 134. Linear opening; 135. Circular hole; 136. Linear incision;

[0048] 14. Bottom hem;

[0049] 140. First crease line; 141. First avoidance opening; 142. Second crease line; 143. Second avoidance opening;

[0050] 15. Bag opening;

[0051] 150. Bag opening hem; 151. Hypotenuse; 152. Third avoidance opening;

[0052] 16. Handle;

[0053] 160. Handle perforation; 161. Head clip;

[0054] 17. Thickness direction; 18. Width direction; 19. Height direction. Detailed implementation manner

[0055] In the prior art, after a three-dimensional bag is formed by a three-dimensional bag forming machine, the three-dimensional bag generally needs to be packed. During the process of gradually folding the three-dimensional bag, multiple crease lines will be formed on the bottom surface of the three-dimensional bag when the bottom surface is folded. Moreover, since the side surfaces need to be folded inward when the three-dimensional bag is folded, at least two of the multiple crease lines will have intersections at the bottom surface. However, due to the shear force and compression force existing during the folding process of the bottom surface, stress concentration will occur at the intersection of the crease lines, resulting in bulges at the intersection of the crease lines and the position of the crease lines shifting during the formation process due to the stress concentration at the intersection of the crease lines, causing deformation of the bottom surface, and thus affecting the aesthetics and yield rate of the three-dimensional bag.

[0056] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will further describe the implementation manners of the present invention in detail with reference to the accompanying drawings.

[0057] Please refer to Figure 1 and Figure 2 , a three-dimensional bag 1, including a bag body 10. The bag body 10 includes a pair of front faces 11 oppositely arranged in the thickness direction 17 of the bag body 10, a pair of side faces 12 oppositely arranged in the width direction 18 of the bag body 10, and a bottom surface 13 arranged at the bottom of the bag body 10 along the height direction 19 of the bag body 10. And a bag opening 15 is formed by enclosing the pair of front faces 11 and the pair of side faces 12 at the top of the bag body 10. Those skilled in the art should understand that the three-dimensional bag 1 disclosed in the present invention can be made of any material such as paper materials, plastics, non-woven fabrics, etc., for example, it can be a paper bag, a plastic bag, a non-woven fabric bag, etc. This embodiment does not make specific limitations in this regard.

[0058] Specifically, the bottom surface 13 is formed with multiple bottom crease lines 130. At least two of the multiple bottom crease lines 130 extend crosswise with each other and form a crease intersection at the intersection position. The bottom surface 13 includes multiple crease intersections; and at least one crease intersection is provided with a bending opening 133 penetrating the bottom surface 13. It should be understood that the number of the multiple bottom crease lines 130 can be 2, 4, 6, etc.; the number of the multiple crease intersections can be 2, 3, 4, etc.

[0059] More specifically, by setting the bending opening 133, the geometric structure at the intersection of multiple bottom crease lines 130 is changed, and the original intersection point of the bottom crease lines 130 becomes the bending opening 133. The bending opening 133 enables the bottom crease lines 130 not to directly converge at one point, thereby dispersing the stress at the intersection position of the multiple bottom crease lines 130. On the other hand, by setting the bending opening 133 to form a buffer area and reducing stress concentration, the stress will be more evenly distributed around the bending opening 133 instead of concentrating at a single intersection point, avoiding the problem that the intersection position of the bottom crease lines 130 bulges when intersecting and the bottom crease lines 130 are displaced due to uneven stress, resulting in the deformation of the bottom surface 13. Therefore, after folding the three-dimensional bag 1, the aesthetics of the three-dimensional bag 1 is ensured and the yield rate of the three-dimensional bag 1 is improved.

[0060] It should be understood that stress refers to the compressive force and shear force received by the bottom crease lines 130 when the bottom surface 13 is folded and formed. This is particularly obvious at the intersection position where multiple bottom crease lines 130 intersect, and there will be stress concentration.

[0061] Furthermore, the setting method of the bending opening 133 will be further explained below.

[0062] Optionally, in an implementable embodiment, please refer to Figure 1 , in order to disperse the stress at the crease intersection of multiple bottom crease lines 130 as much as possible, so that the bottom surface 13 is not easily deformed; the bending opening 133 is set as a hole opened at the corresponding crease intersection, and the hole is opened at the center position of the crease intersection, so that the length of the multiple bottom crease lines 130 located in the hole is maximized. When the multiple bottom crease lines 130 intersect at the crease intersection, the stress is dispersed as much as possible. Finally, when the multiple bottom crease lines 130 intersect at the crease intersection, the intersection position is not easily bulged, ensuring the aesthetics of the three-dimensional bag 1. It should be understood that the hole can be square, circular, etc., and this example is not limited here.

[0063] Optionally, in another implementable embodiment, please refer to Figure 3 , the bending opening 133 is a linear opening 134 extending from the center position of the crease intersection along at least one bottom crease line 130 forming the crease intersection. The linear opening 134 penetrates the bottom surface 13, so that when the multiple bottom crease lines 130 intersect at the crease intersection, the intersection point is located within the linear opening 134, and the stress is dispersed, thereby avoiding the problem that the bottom surface 13 is deformed due to excessive stress at the intersection position where the multiple bottom crease lines 130 intersect each other.

[0064] It should be understood that when multiple bottom crease lines 130 intersect at the crease intersection, the linear opening 134 can be formed on one bottom crease line 130, or linear openings 134 can be formed on two bottom crease lines 130, or linear openings 134 can be formed on each bottom crease line 130 (see Figure 3 ), and this embodiment does not make any limitation here.

[0065] Preferably, in an implementable embodiment, please refer to Figure 3 . When multiple bottom crease lines 130 intersect at the crease intersection, linear openings are formed at the intersection position on each bottom crease line 130, so that the stress on each bottom crease line 130 can be dispersed as much as possible, avoiding the problem that the bottom surface 13 is deformed due to excessive stress at the intersection position where multiple bottom crease lines 130 intersect, and ensuring the aesthetics and yield rate of the three-dimensional bag 1.

[0066] Optionally, in an implementable embodiment, please refer to Figure 5 . In order to disperse the stress on the bottom surface 13 as much as possible, when looking at the bottom surface 13 along the bottom, multiple crease intersections on the bottom surface 13 are symmetrically distributed with respect to the center line in the width direction 18 of the bag body 10, and at least a pair of bending openings 133 that are symmetrically distributed with respect to the center line are formed on the bottom surface 13, so that the bending openings 133 are evenly distributed on the bottom surface 13. During the folding process of the bottom surface 13, when multiple bottom crease lines 130 are formed, the intersection positions of the multiple bottom crease lines 130 on the bottom surface 13 correspond one by one to the formed bending openings 133, thereby avoiding stress concentration at the intersection positions of the multiple bottom crease lines 130, enabling the bottom surface 13 to be folded along the predetermined bottom crease lines 130, and further ensuring the aesthetics and quality after forming of the three-dimensional bag 1. It should be understood that the bending openings 133 can be set to one pair, two pairs, three pairs, etc., and this embodiment does not make any limitation here.

[0067] Furthermore, the structure and setting method of the three-dimensional bag 1 will be further explained below.

[0068] Optionally, in an implementable embodiment, please refer to Figure 5 and Figure 6, a pair of front faces 11 are connected by a pair of side faces 12. Each side face 12 includes two side sub-faces 120. The opposite edges of the two side sub-faces 120 at least partially overlap and lap in the thickness direction 17 of the three-dimensional bag 1. Both sides of the bottom face 13 are respectively connected to a corresponding side face 12 through bottom edge bindings 14, thereby enclosing a bag body 10 through a pair of front faces 11, a pair of side faces 12, and the bottom face 13. Moreover, by providing the bottom edge bindings 14 to connect the bottom face 13 and the side face 12, the area where the bottom face 13 and the side face 12 are interconnected is larger, thus enhancing the structural strength of the three-dimensional bag 1.

[0069] Specifically, when the bag body 10 is formed, the two front faces 11 are folded relative to the bottom face 13 to be parallel to the height direction 19 and opposite to each other in the thickness direction 17. Then, the two side sub-faces 120 of each side face 12 are both folded so that the opposite edges of the two side sub-faces 120 overlap and are fixed to each other in the thickness direction 17, thereby realizing the formation of the bag body 10. It should be understood that the overlapping and fixing method can be bonding, ultrasonic welding, etc. For example, when the three-dimensional bag 1 is a paper bag, it can be fixed by bonding. When the three-dimensional bag 1 is a non-woven bag, it can be fixed by ultrasonic welding. This embodiment does not make a limitation here.

[0070] More specifically, a side crease line 121 extending along the height direction 19 of the bag body 10 is formed at the overlapping part of each side face 12. During the process of packing the three-dimensional bag 1, the side crease line 121 plays a guiding role when folding the side face 12, guiding the side face 12 to bend along the side crease line 121, avoiding the risk of deformation of the side face 12 during the folding process.

[0071] More specifically, the bottom crease line 130 includes a middle part in the thickness direction 17 of the bottom face 13, a middle bottom crease line 131 extending along the width direction 18, and two V-shaped crease lines 132 on both sides of the bottom face 13 close to the bottom edge binding 14. The inner end of each V-shaped crease line 132 intersects with the middle bottom crease line 131. When folding the three-dimensional bag 1, it can be gradually folded along the middle bottom crease line 131, the two V-shaped crease lines 132, and the side crease line 121. Moreover, since the bottom face 13 is provided with two V-shaped crease lines 132, the side face 12 can be folded towards the inside of the three-dimensional bag 1 along the width direction 18, thereby reducing the storage space of the three-dimensional bag 1. For example, when tying multiple folded three-dimensional bags 1 with a binding strap, the amount of the binding strap used will be reduced, thus reducing the packing cost of the three-dimensional bag 1.

[0072] More specifically, a bending opening 133 is provided at the crease intersection formed by the intersection of the middle bottom crease line 131 and the inner end of each V-shaped crease line 132, thereby reducing the stress at the intersection of the middle bottom crease line 131 and the inner end of each V-shaped crease line 132. When the three-dimensional bag 1 is folded again, the risk of deformation of the bottom surface 13 is reduced.

[0073] Optionally, in an implementable embodiment, please refer to Figure 1 , when the middle bottom crease line 131 is provided on the bottom surface 13, the bending opening 133 can also be set as a circular hole 135 provided at the center of the crease intersection; so that the distances between the middle bottom crease line 131 and each V-shaped crease line 132 within the circular hole 135 are equal, making the stress at the intersection of the middle bottom crease line 131 and the inner end of each V-shaped crease line 132 more evenly dispersed, thereby ensuring the reliability during the folding process of the bottom surface 13 and further reducing the risk of deformation of the bottom surface 13.

[0074] Optionally, in another implementable embodiment, please refer to Figure 4 , when the middle bottom crease line 131 is provided on the bottom surface 13, the bending opening 133 can also be set as a linear incision 136 extending towards each other along the middle bottom crease line 131.

[0075] Furthermore, those skilled in the art should understand that when the bending opening 133 is set to different shapes, the opening size should be reasonably designed to avoid excessive damage to the support strength of the bottom surface 13. For example, when the bending opening is a circular hole, the radius range of the circular hole 135 is: 3 mm to 6 mm, such as 3 mm, 4.5 mm, 6 mm, etc. This embodiment does not make a limitation here.

[0076] Furthermore, a viewing window (not shown in the figure) is also provided on the front surface 11. The viewing window penetrates the front surface 11 along the thickness direction 17. By providing the viewing window, the items placed in the bag body 10 can be displayed, such as milk tea, fruits, etc., for people to identify.

[0077] Optionally, in one embodiment, the viewing window is provided only on one of the pair of front surfaces 11.

[0078] Optionally, in another embodiment, the viewing window can also be provided on each of the pair of front surfaces 11.

[0079] Furthermore, the following further explains the setting method of the bottom edge 14.

[0080] Optionally, in an implementable embodiment, please refer to Figure 6 and Figure 7Bottom edging 14 is provided on both sides of the bottom surface 13, and the bottom surface 13 is fixedly connected to the inner wall surfaces of the two side surfaces 120 through the bottom edging 14, so that the area where the bottom surface 13 and each side surface 120 are connected to each other is larger, thereby improving the structural strength of the three-dimensional bag 1.

[0081] Specifically, two first indentation lines 140 extending along the thickness direction 17 are provided at a position near the bottom surface 13 of the bottom edge 14, and the two first indentation lines 140 are spaced apart along the width direction 18 and parallel to each other; wherein, one of the two first indentation lines 140 is located at the connecting position between the bottom edge 14 and the bottom surface 13, and the other first indentation line 140 is located on the bottom edge 14 and close to the bottom surface 13.

[0082] More specifically, by setting two first indentation lines 140, when the bottom edging 14 set on both sides of the bottom surface 13 is connected to the inner wall surfaces of the two corresponding side dividing surfaces 120, the two side dividing surfaces 120 are staggered in the height direction 19 from the first indentation line 140 located at the connection position between the bottom edging 14 and the bottom surface 13; after the three-dimensional bag 1 is folded, the first indentation line 140 located at the connection position between the bottom edging 14 and the bottom surface 13 is not pasted to the bottom of the two side dividing surfaces 120, but is connected to the bottom edges of the two side dividing surfaces 120 through the first indentation line 140 located on the bottom edging 14, so that the bottom edges of the two side dividing surfaces 120 will not directly overlap with the first indentation line 140 located at the connection position between the bottom edging 14 and the bottom surface 13, thereby avoiding the problem of bulging in the area at the first indentation line 140 located at the connection position between the bottom edging 14 and the bottom surface 13 when the three-dimensional bag 1 is folded. Furthermore, when the bottom edging 14 and the inner wall surfaces of the two side faces 120 are folded and connected, it is easier to achieve smooth folding, and the bottom of the folded three-dimensional bag 1 is smoother, without any extra thickness protruding, and the overall appearance is more beautiful.

[0083] Optionally, in this embodiment, see Figure 7 Along the thickness direction 17, first avoidance openings 141 are formed on both side edges of the bottom edge 14; and along the height direction 19, the first avoidance openings 141 gradually increase from one side edge of the bottom edge 14 close to the bottom surface 13 toward one side edge of the bottom edge 14 away from the bottom surface 13.

[0084] Specifically, when connecting the bottom edge strips 14 provided on both sides of the bottom surface 13 to the inner wall surfaces of the two corresponding side split surfaces 120, since the two side split surfaces 120 are not yet connected to each other at this time, the two side split surfaces 120 will protrude from the bottom surface 13 in the width direction 18. First avoidance openings 141 are formed at both side edges of the bottom edge strip 14. When the bottom edge strip 14 is flipped around the thickness direction 17, the first avoidance openings 141 can avoid each other with the side split surfaces 120. When the bottom edge strip 14 is flipped to be perpendicular to the bottom surface 13, then the two side split surfaces 120 are flipped around the height direction 19 to approach each other until the edges of the two side split surfaces 120 coincide with each other. At this time, the bottom edge strip 14 is fixedly connected to the inner wall surfaces of the two side split surfaces 120. Therefore, first avoidance openings 141 are formed at both side edges of the bottom edge strip 14, so as to facilitate the mutual avoidance between the bottom edge strip 14 and the two side split surfaces 120 during the folding process of the bottom edge strip 14, and facilitate folding.

[0085] Optionally, in another implementable embodiment, please refer to Figure 8 and Figure 9 , along the height direction 19, bottom edge strips 14 are provided at the bottoms of the two side split surfaces 120 of each side surface 12, and the two side split surfaces 120 are fixedly connected to the outer wall surface of the bottom surface 13 through the bottom edge strips 14, so that the area where the bottom surface 13 is connected to each side split surface 120 is larger, thereby enhancing the structural strength of the three-dimensional bag 1.

[0086] Specifically, on each side split surface 120, two second indentation lines 142 extending along the thickness direction 17 are provided at positions where the bottom edge strip 14 is close to the side split surface 120. The two second indentation lines 142 are spaced apart along the height direction 19 and are parallel to each other; wherein, one of the two second indentation lines 142 is located at the connection position between the bottom edge strip 14 and the side split surface 120, and the other second indentation line 142 is located on the bottom edge strip 14 and close to the edge of the side split surface 120.

[0087] More specifically, by providing two second indentation lines 142, when connecting the inner wall surface of the connection part between the bottom edge 14 at the bottom of the two side sub - surfaces 120 of each side surface 12 and the corresponding bottom surface 13, the bottom surface 13 is offset from the second indentation line 142 located on the bottom edge 14 and near the edge of the side sub - surface 120. After the three - dimensional bag 1 is folded, in the width direction 18, the second indentation line 142 at the connection position between the bottom edge 14 and the side sub - surface 120 is not adhered to the edge of the bottom surface 13, so that the second indentation line 142 at the connection position between the bottom edge 14 and the side sub - surface 120 does not directly overlap with the edge of the bottom surface 13. When folding the three - dimensional bag 1, the problem of the area at the second indentation line 142 at the connection position between the bottom edge 14 and the side sub - surface 120 becoming thick is avoided. Moreover, when folding and connecting the outer wall surface of the bottom edge 14 and the bottom surface 13, a flat fold can be more easily achieved, reducing the thickness after folding. The bottom of the folded three - dimensional bag 1 is flatter, without excessive thickness protrusion, and the overall appearance is more beautiful.

[0088] Further, in this embodiment, please refer to Figure 9 , along the thickness direction 17, a second avoidance opening 143 is formed at one side edge of the bottom edge 14 close to the front surface 11. Along the height direction 19, the second avoidance opening 143 gradually increases from one side edge of the bottom edge 14 close to the side sub - surface 120 towards the other side edge of the bottom edge 14 away from the side sub - surface 120.

[0089] Specifically, when connecting the inner wall surface of the connection part between the bottom edge 14 at the bottom of the two side sub - surfaces 120 of each side surface 12 and the corresponding bottom surface 13, since the two side sub - surfaces 120 are not yet connected to each other at this time, the two side sub - surfaces 120 will protrude downward from the bottom surface 13 in the height direction 19. A second avoidance opening 143 is provided at one side edge of the bottom edge 14 close to the front surface 11. Now, the bottom edge 14 is rotated around the width direction to be parallel to the bottom surface, and then when the two side sub - surfaces 120 are rotated around the height direction 19 and approach each other, the front surface 11 can be avoided through the second avoidance opening 143. Until the edges of the two side sub - surfaces 120 coincide with each other, at this time, the bottom edge 14 is folded around the width direction 18 and fixedly connected to the outer wall surface of the bottom surface 13. Therefore, second avoidance openings 143 are formed at both side edges of the bottom edge 14, so that the bottom edge 14 and the bottom surface 13 can avoid each other during the folding process of the two side sub - surfaces 120, facilitating folding.

[0090] Further, the setting method of the bag opening 15 will be further explained below.

[0091] Optionally, in an implementable embodiment, please refer to Figures 10 - 13, a bag mouth hem 150 is formed at the top of the front surface 11 and the two side sub - surfaces 120 of each side surface 12. The bag mouth hems 150 of the two side sub - surfaces 120 are plugged and fixed to each other, so that the contact area between the two side sub - surfaces 120 is larger. This not only enhances the connection strength between the two side sub - surfaces 120, but also enhances the strength of the bag mouth 15. Furthermore, the durability of the bag mouth 15 can be increased. The bag mouth hem 150 can also provide additional support for the closure of the bag mouth 15, and the bag mouth hem 150 can make the edge of the bag mouth more neat and smooth, improving the overall aesthetic appearance of the three - dimensional bag 1.

[0092] Specifically, a third avoidance opening 152 is formed at the position of the bag mouth hem 150 of the two side sub - surfaces 120 of each side surface 12 near the side crease line 121. Along the height direction 19, the third avoidance opening 152 gradually decreases from the edge of the bag mouth hem 150 far from the top of the side sub - surface 120 towards the edge of the bag mouth hem 150 close to the top of the side sub - surface 120. Therefore, when the two side sub - surfaces 120 are plugged and fixed, the third avoidance opening 152 is used to avoid part of the sheet material at the connection position of the bag mouth hems 150 on the two side sub - surfaces 120. Furthermore, it can prevent the bag mouth hems 150 on the two side sub - surfaces 120 from being affected by the stacking of multiple layers of sheet materials when they are plugged into each other, thus reducing the visual abruptness and making the overall three - dimensional bag 1 more beautiful.

[0093] More specifically, during the forming process of the three - dimensional bag 1, when the two side sub - surfaces 120 are plugged and fixed to each other, the two side sub - surfaces 120 are rotated around the height direction 19 to approach each other. Then, after the two side sub - surfaces 120 approach the plugging position, one of the two side sub - surfaces 120 only needs to move down a small distance in the height direction 19 (see Figure 12 ), and then the two side sub - surfaces 120 can be plugged into each other through the corresponding third avoidance openings 152 of the two side sub - surfaces 120 (see Figure 13 ), which has the advantage of convenient plugging.

[0094] Optionally, in an implementable embodiment, bevels 151 are formed at the positions of the bag mouth hems 150 on the two side sub - surfaces 120 near the side crease line 121. The bevels 151 extend obliquely upward along the thickness direction 17 from the edge of the corresponding side sub - surface 120. The space between the bevel 151 and the top edge of the bag mouth 15 constitutes the third avoidance opening 152, and at least part of the bevel 151 of one of the two side sub - surfaces 120 is plugged into at least part of the bevel 151 of the other side sub - surface 120, so that at least part of the positions of the bag mouth hems 150 on the two side sub - surfaces 120 overlap each other, further enhancing the connection strength between the two side sub - surfaces 120.

[0095] Specifically, please refer to Figures 12 to 13During the operation process, the design of the hypotenuse 151 enables the bag mouth hem 150 on the two side dividing surfaces 120 to have a natural guiding direction when they are inserted into each other. As a result, when the bag mouth hems 150 on the two side dividing surfaces 120 are inserted into each other, one side dividing surface 120 remains stationary, and after the other side dividing surface 120 moves downward along the height direction 19 and then moves upward, it is guided by the hypotenuse 151 of the stationary side dividing surface 120, thus ensuring the reliability of the insertion.

[0096] It should be understood that the inclination angle of the hypotenuse 151 in the thickness direction 17 is between 30° and 60°, for example, it can be 30°, 35°, 40°, 45°, 60° or any other arbitrary angle within the above angle range. It should be noted that if the inclination angle of the hypotenuse 151 in the thickness direction 17 exceeds 60°, the overlapping and inserting parts of the two bag mouth hems 150 are less, and it cannot play a role in strengthening the connection strength. If the inclination angle of the hypotenuse 151 in the thickness direction 17 is less than 30°, during the insertion process, the bag mouth hems 150 of the two side dividing surfaces 120 still need to be staggered by a large height difference in the height direction 19, and it is impossible to simplify the difficulty of the insertion operation.

[0097] Optionally, in an implementable embodiment, referring to Figure 5 , for the convenience of taking the three-dimensional bag 1, the three-dimensional bag 1 further includes a handle 16. Two handle perforations 160 are provided at a predetermined interval along the width direction 18 on the upper edge of the bag mouth hem 150. The two ends of the handle 16 pass through their respective corresponding handle perforations 160 and are fixedly connected to both the front surface 11 and the inner wall surface of the bag mouth hem 150; and, in the height direction 19, the handle perforations 160 are close to the crease of the bag mouth hem 150. When the three-dimensional bag 1 is used later, the three-dimensional bag 1 can be used by grasping the handle 16.

[0098] Optionally, in an implementable embodiment, a head card 161 is fixedly connected to the position near the top of the inner wall surface of the front surface 11 (refer to Figure 5 ), the two ends of the handle 16 pass through their respective corresponding handle perforations 160 and are fixed between the head card 161 and the inner wall surface of the bag mouth hem 150, thereby enhancing the connection strength between the handle 16 and the bag body 10 and ensuring the reliability of using the three-dimensional bag 1; and / or a bottom card is further provided inside the three-dimensional bag 1. The bottom card is arranged at the bottom of the three-dimensional bag 1 and is adapted to the shape of the bottom surface 13. By providing the bottom card on the bottom surface 13, the support strength of the bottom surface 13 can be increased, thereby enhancing the load-bearing capacity of the three-dimensional bag 1. It should be understood that only the head card 161 can be provided on the three-dimensional bag 1, or only the bottom card can be provided on the three-dimensional bag 1; or both the head card 161 and the bottom card can be provided on the three-dimensional bag 1.

[0099] Optionally, in another implementable embodiment, a head clip 161 may also be fixedly connected to a position near the top of the inner wall surface of the front surface 11. Both ends of the handle 16 pass through their respective handle perforations 160 and are fixed between the head clip 161 and the inner wall surface of the bag mouth hem 150, which also has the effect of enhancing the connection strength between the handle 16 and the bag body 10.

[0100] Optionally, in an implementable embodiment, the three-dimensional bag 1 further includes at least one buckle (not shown in the figure) fixedly provided at the bag mouth hem 150. During the use of the three-dimensional bag 1, the bag mouth 15 of the three-dimensional bag 1 can be closed by the buckle. It should be understood that the number of buckles can be 2, 4, 5, etc., and this embodiment does not limit this here.

[0101] Optionally, in an embodiment, a head clip 161 is provided between the installation position of each buckle and the bag mouth hem 150, and between the inner wall surface of the front surface 11 and the inner wall surface of the bag mouth hem 150. The head clip 161 is fixedly connected to both the inner wall surface of the front surface 11 and the inner wall surface of the bag mouth hem 150. By providing a head clip 161 at the installation position of each buckle and the bag mouth hem 150, the connection strength between the buckle and the bag mouth hem 150 can be higher when the buckle is installed on the bag mouth hem 150.

[0102] Optionally, in another embodiment, a decorative piece is fixedly provided on the outer wall surface of the front surface 11 at the installation position of each buckle and the bag mouth hem 150. The decorative piece covers the installation position of the buckle and the bag mouth hem 150. By covering the installation position of the buckle and the bag mouth hem 150 with the decorative piece, the three-dimensional bag 1 can be made more beautiful. It should be understood that the decorative piece can be a bow, a paper-cut card, etc., and this embodiment does not limit this here.

[0103] In summary, the advantages of the three-dimensional bag 1 provided by the present invention are as follows: By providing a bending opening 133 at the intersection position of multiple bottom crease lines 130 on the bottom surface 13, the geometric structure at the intersection of the multiple bottom crease lines 130 is changed, and the original intersection point of the bottom crease lines 130 becomes the bending opening 133. The bending opening 133 enables the bottom crease lines 130 not to directly converge at one point, thereby dispersing the stress at the intersection position of the multiple bottom crease lines 130; on the other hand, by providing the bending opening 133 to form a buffer area for reducing stress concentration, the stress will be more evenly distributed around the bending opening 133 instead of concentrating at a single intersection point, avoiding the problem that the intersection position bulges when the bottom crease lines 130 intersect and the bottom crease lines 130 are displaced due to uneven stress, resulting in deformation of the bottom surface 13. Therefore, the beauty of the three-dimensional bag 1 is ensured and the yield rate of the three-dimensional bag 1 is improved after the three-dimensional bag 1 is folded.

[0104] Further, when bottom edge wrappings 14 are provided on both sides of the bottom surface 13, two first indentation lines 140 extending in the thickness direction 17 are provided at positions of the bottom edge wrappings 14 close to the bottom surface 13. When the bottom edge wrappings 14 are fold-connecting with the inner wall surfaces of the two side dividing surfaces 120, flat folding can be more easily achieved. After folding, the bottom of the three-dimensional bag 1 is flatter, without redundant thickness protrusion, and the overall appearance is more beautiful. Or, when bottom edge wrappings 14 are provided at the bottoms of the two side dividing surfaces 120 of each side surface 12, two second indentation lines 142 extending in the thickness direction 17 are provided at positions of the bottom edge wrappings 14 close to the side dividing surfaces 120. When the bottom edge wrappings 14 are fold-connecting with the outer wall surface of the bottom surface 13, flat folding can also be more easily achieved, reducing the thickness after folding and making the overall appearance of the three-dimensional bag 1 more beautiful.

[0105] Further, third avoidance openings 152 are formed at positions of the bag mouth hemmings 150 of the two side dividing surfaces 120 of each side surface 12 close to the side indentation lines 121. During the forming process of the three-dimensional bag 1, when the two side dividing surfaces 120 are inserted and fixed to each other, the two side dividing surfaces 120 are flipped around the height direction 19 to approach each other. Then, after the two side dividing surfaces 120 are close to the insertion position, one of the two side dividing surfaces 120 only needs to move down a small distance in the height direction 19, and then the two side dividing surfaces 120 can be inserted into each other through the third avoidance openings 152 corresponding to the two side dividing surfaces 120 respectively, which has the advantage of convenient insertion.

[0106] The above specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiments, this does not mean that the features of this invention are limited to this implementation manner. On the contrary, the purpose of introducing the invention in conjunction with the implementation manner is to cover other alternatives or modifications that may be extended based on the claims of the present invention. To provide a deep understanding of the present invention, many specific details will be included in the above description. The present invention can also be implemented without using these details. In addition, to avoid confusion or obscuring the key points of the present invention, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0107] 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.

[0108] 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 inventive product is customarily placed during use. It is only for the convenience of describing the present invention 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 to the present invention.

[0109] The terms "first", "second", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0110] In the description of this embodiment, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "connected", "connected to" 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.

Claims

1. A three-dimensional bag, characterized in that: The bag body comprises a pair of front faces arranged opposite to each other in the thickness direction of the bag body, a pair of side faces arranged opposite to each other in the width direction of the bag body, and a bottom face arranged at the bottom of the bag body along the height direction of the bag body, and a bag opening is formed at the top of the bag body; wherein, The bottom surface is formed with a plurality of bottom crease lines, at least two of the plurality of bottom crease lines cross each other and extend to form a crease intersection at the intersection position, and the bottom surface includes a plurality of the crease intersections; and at least one of the crease intersections is provided with a bending opening penetrating the bottom surface, so as to avoid stress concentration at the intersection positions of the plurality of bottom crease lines; The pair of front faces are connected by the pair of side faces, each of the side faces includes two side facets, the opposite edges of the two side facets at least partially overlap in the thickness direction of the three-dimensional bag, and the two sides of the bottom face are respectively connected to a corresponding one of the side faces through the bottom hemming; wherein, The overlapping portion of each side surface is formed with a side indentation line extending along the height direction of the bag body; The bottom crease line includes a middle part of the bottom surface in the thickness direction, a middle bottom crease line extending in the width direction, and two V-shaped crease lines on both sides of the bottom surface close to the bottom hem, and the inner end of each V-shaped crease line intersects with the middle bottom crease line; and The crease intersection formed by the intersection of the middle bottom crease line and the inner end of each V-shaped crease line is provided with a corresponding bending opening, so that the bottom surface is folded along the bottom crease line; The bottom edge is provided on both sides of the bottom surface, and the bottom surface is fixedly connected to the inner wall surfaces of the two side surfaces through the bottom edge, and; the bottom edge is provided with two first indentation lines extending along the thickness direction at a position close to the bottom surface, and the two first indentation lines are arranged at intervals along the width direction and are parallel to each other; wherein, One of the two first indentation lines is located at a connection position between the bottom edge and the bottom surface, and the other first indentation line is located on the bottom edge and close to the bottom surface; By setting two first indentation lines, when the bottom edging arranged on both sides of the bottom surface is connected to the inner wall surfaces of the two corresponding side surfaces, the two side surfaces are staggered in the height direction from the first indentation line located at the connection position between the bottom edging and the bottom surface; after the three-dimensional bag is folded, the first indentation line located at the connection position between the bottom edging and the bottom surface is not adhered to the bottom of the two side surfaces, but is connected to the bottom edges of the two side surfaces through the first indentation line located on the bottom edging.

2. The three-dimensional bag according to claim 1, characterized in that: The bending opening is a hole opened at the corresponding intersection of the folds, and the hole is opened at the center position of the intersection of the folds.

3. The three-dimensional bag according to claim 1, characterized in that: The bending opening is a linear opening extending from the center position of the fold intersection along at least one fold line forming the fold intersection, and the linear opening passes through the bottom surface.

4. The three-dimensional bag according to any one of claims 1 to 3, characterized in that: When looking toward the bottom surface along the bottom, the multiple fold intersections on the bottom surface are symmetrically distributed relative to the center line of the bottom surface in the width direction of the bag body, and at least one pair of bent openings symmetrically distributed relative to the center line is provided.

5. The three-dimensional bag according to claim 4, characterized in that: The bending opening is a circular hole opened at the center of the intersection of the folds; or, The bending openings are linear cuts extending toward each other along the middle bottom crease line.

6. The three-dimensional bag according to claim 4, characterized in that: Along the thickness direction, both side edges of the bottom edging are formed with a first avoidance opening; and along the height direction, the first avoidance opening gradually increases from the side edge of the bottom edging close to the bottom surface toward the side edge of the bottom edging away from the bottom surface.

7. The three-dimensional bag according to claim 4, characterized in that: The tops of the two side surfaces of the front surface and each of the side surfaces are formed with pocket folds, and the pocket folds of the two side surfaces are plugged and fixed to each other; and A third avoidance opening is formed at the position of the pocket fold edge of the two side dividing surfaces of each side surface close to the side indentation line, and along the height direction, the third avoidance opening gradually decreases from the side edge of the pocket fold edge away from the top of the side dividing surface to the side edge of the pocket fold edge close to the top of the side dividing surface.

8. The three-dimensional bag according to claim 7, characterized in that: The bag opening folding edges on the two side surfaces are formed with beveled edges near the side indentation lines, and the beveled edges extend obliquely upward from the edges of the corresponding side surfaces along the thickness direction, and the space between the beveled edges and the top edge of the bag opening constitutes the third avoidance opening, and the beveled edges of one of the two side surfaces are at least partially plugged into the beveled edges of the other side surfaces.

9. The three-dimensional bag according to claim 7, characterized in that: The three-dimensional bag further comprises a handle, and two handle perforations are arranged on the bag opening fold at a predetermined interval along the width direction, and both ends of the handle pass through the respective corresponding handle perforations and are fixedly connected to the front surface and the inner wall surface of the bag opening fold; and In the height direction, the handle perforation is close to the fold of the bag opening fold.

10. The three-dimensional bag according to claim 9, characterized in that: A header clip is fixedly connected to the inner wall surface of the front side near the top, and both ends of the handle pass through the corresponding handle holes and are fixed between the header clip and the inner wall surface of the bag opening fold, or between the header clip and the inner wall surface of the front side; and / or A bottom card is also arranged in the three-dimensional bag. The bottom card is arranged at the bottom of the three-dimensional bag and is adapted to the shape of the bottom surface.

11. The three-dimensional bag according to claim 10, characterized in that: The three-dimensional bag also includes at least one buckle fixedly arranged at the folded edge of the bag opening.

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