Stereo bag

Abstract

The present invention discloses a three-dimensional bag, comprising a bag body, wherein the bag body comprises a pair of front faces, a pair of side faces, and a bottom face; wherein the pair of front faces are connected by a pair of side faces, each side face comprises two side facets that are overlapped and fixed to each other, the outer end portion of the bottom edge of each side facet is offset from the bottom bending line of the corresponding side in the height direction and is located a first predetermined distance above the bottom bending line, and the inner end portion extends toward the inner side of the bag body along the thickness direction, so that a notch region is formed between the bottom edge of each side facet and the corresponding bottom bending line, thereby dispersing stress along the edge of the notch region during the folding process of the three-dimensional bag, making it easier to fold. Moreover, since a notch region is formed between the bottom edge of each side facet and the corresponding bottom bending line, the notch region provides deformation space for the bending of the sheet material at the corner of the bag; and also makes the bag body flatter after folding, making it easier to stack and store.

Description

Technical Field

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

[0002] Three-dimensional bags are a type of packaging bag with a variety of shapes and functions, 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. In addition, there are many types of three-dimensional bags, including paper bags, kraft paper bags, non-woven bags, etc.

[0003] To increase the connection strength between the bottom and side surfaces of a three-dimensional bag, connectors are generally provided on both sides of the bottom along the width direction of the three-dimensional bag, connecting to the side surfaces. The two sides of the bottom in the width direction are connected to the inner wall surfaces of the corresponding side surfaces via the connectors, thereby increasing the structural strength of the three-dimensional bag. However, in the prior art, after the three-dimensional bag is formed, it is generally necessary to fold the three-dimensional bag. In order to make the three-dimensional bag occupy less space, the prior art generally folds the side surfaces of the three-dimensional bag so that the bottom surface is folded inward and the pair of front surfaces are attached to each other. However, since the bottom surface is fixedly connected to the corresponding side surfaces through connectors, and both the side surfaces and the bottom surface will bend and deform during the folding process, and since the bottom of the side surface is adhered to one side of the connector, the side surface covers the bending line (crease line) of the connector and the bottom surface, which causes obvious extrusion at the connection between the side surface and the bottom surface, especially at the corner of the bag. The multi-layer sheet material (bottom surface, side surface and connector) is seriously piled up, which is not convenient for folding on the one hand. On the other hand, the folded three-dimensional bag will bulge at the corner of the bag due to the stacking of materials, making the three-dimensional bag not flat after folding and not convenient for stacking and packaging.

[0004] Therefore, the three-dimensional bag in the prior art has the problems of being inconvenient to fold and not being flat after folding. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems in the prior art that three-dimensional bags are difficult to fold and not flat after folding.

[0006] In order to solve the above problems, the present invention provides a three-dimensional bag, including a bag body, the bag body including 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; wherein, the pair of front faces are connected by a pair of side faces, a bottom bending line is formed between the bottom face and the pair of front faces, and bottom edges fixedly connected to the bottom ends of the corresponding side faces are extended on both sides of the bottom face in the width direction, and an edge bending line is formed between each bottom edge and the corresponding one side end of the bottom face; and each side face includes two side facets overlapped and fixed to each other, a side bending line is formed between each side facet and the corresponding front face, and the outer wall surface of each bottom edge is overlapped and fixed to the inner wall surfaces of the corresponding two side facets.

[0007] Among them, when viewed along the width direction, the outer end portion of the bottom edge of each side surface is offset from the bottom bending line of the corresponding side in the height direction of the bag body and is located a first predetermined distance above the bottom bending line, and the inner end portion extends toward the inner side of the bag body along the thickness direction; and the lower ends of the two side edges of each bottom edging in the thickness direction are respectively connected to the corresponding ends of the bottom bending line of the corresponding side, and the upper end extends along the height direction toward and away from the bottom surface.

[0008] By adopting the above technical solution, by setting a bottom edging and overlapping and fixing the outer wall surface of the bottom edging with the inner wall surfaces of the corresponding two side surfaces, the connection strength between the bottom surface and the side surfaces can be enhanced, thereby improving the load-bearing capacity of the three-dimensional bag.

[0009] Furthermore, the outer end of the bottom edge of each side facet is offset from the bottom fold line of the corresponding side in the height direction and is located a first predetermined distance above the bottom fold line, and the inner end extends toward the inner side of the bag body in the thickness direction, so that a notch area is formed between the bottom edge of each side facet and the corresponding bottom fold line. This changes the force distribution of the sheet material at the bag corner when the three-dimensional bag is folded. When a traditional three-dimensional bag is folded, the connection between the bottom and the side (bag corner) forms an accumulation due to the superposition of multiple layers of sheet material (bottom + side + connector), resulting in local stress concentration. However, the bottom edge of each side facet of the three-dimensional bag of the present application forms a notch area between the bottom edge and the corresponding bottom fold line, which removes part of the sheet material at the bottom of each side facet, reduces the number of sheet material layers in the bag corner bending area, and disperses the stress along the edge of the notch area, making it easier to fold.

[0010] Furthermore, because a notch is formed between the bottom edge of each side panel and its corresponding bottom bend line, the notch provides space for the sheet material at the bag corner to bend. When the bag is folded, the multiple layers of sheet material at the corner would otherwise be compressed. The notch allows the sheet material to move toward the notch, reducing the amount of sheet material at the corner stacking toward the outside of the bag, thereby reducing the protrusion of the bag corner. This, on the one hand, reduces resistance during manual or mechanical folding, making folding easier; on the other hand, it also makes the bag flatter after folding, making it easier to stack and store.

[0011] Furthermore, since the lower ends of the two side edges of each bottom edge in the thickness direction are respectively connected to the corresponding ends of the bottom bending line on the corresponding side, and the upper ends extend in the height direction toward and away from the bottom surface; there is no gap between the two side edges of the bottom surface in the width direction and the corresponding bottom edges, the sealing of the bottom surface is higher, and the connection strength between the two side edges of the bottom surface in the width direction and the corresponding bottom edges is higher, thereby improving the carrying capacity of the three-dimensional bag.

[0012] Furthermore, since the outer end portion of the bottom edge of each side panel is offset from the bottom bending line of the corresponding side in the height direction, and the lower ends of the two side edges of each bottom edging in the thickness direction are respectively connected to the corresponding ends of the bottom bending line of the corresponding side, therefore, in the thickness direction, the outer end portion of the bottom edge of each side panel and the lower ends of the two side edges of the corresponding bottom edging in the thickness direction are offset from each other, so that during the forming process of the bag body, the two side edges of the side will not interfere with the bottom edging.

[0013] Furthermore, in an embodiment of the three-dimensional bag, the inner end portion of the bottom edge of each side surface extends obliquely relative to the thickness direction, and the inner end portions of the bottom edges of two side surfaces on the same side surface are connected to each other.

[0014] In addition, the portion where the inner ends of the bottom edges of the two side panels of the same side surface are connected to each other is located at a second predetermined distance above the bottom bending line in the height direction, and the second predetermined distance is 1 to 2 times the thickness of the bag sheet material larger than the first predetermined distance in the height direction.

[0015] By adopting the above technical solution, by setting the inner end of the bottom edge of each side facet to extend obliquely relative to the thickness direction, it is possible to select whether the inner end of the bottom edge of each side facet extends obliquely upward or downward relative to the thickness direction according to production requirements. When the sheet thickness of the three-dimensional bag is relatively large, and the gap area formed between the bottom edge of each side facet and the corresponding bottom bend line needs to be larger, the inner end of the bottom edge of each side facet can be set to extend obliquely upward relative to the thickness direction; when the sheet thickness of the three-dimensional bag is relatively small, and the gap area formed between the bottom edge of each side facet and the corresponding bottom bend line needs to be smaller to achieve a higher connection strength between the bottom and side surfaces, the inner end of the bottom edge of each side facet can be set to extend obliquely downward relative to the thickness direction.

[0016] Furthermore, since the inner end portions of the bottom edges of the two side panels on the same side are connected to each other; and the portion where the inner end portions of the bottom edges of the two side panels on the same side are connected to each other is located at a second predetermined distance above the bottom bending line in the height direction, the size of the gap area formed between the bottom edge of each side panel and its corresponding bottom bending line is maximized in the thickness direction, thereby making the bag body easier to fold.

[0017] Furthermore, in an embodiment of the three-dimensional bag, the inner end portion of the bottom edge of each side surface extends obliquely relative to the thickness direction, and the inner end portions of the bottom edges of two side surfaces on the same side surface are connected to each other.

[0018] Furthermore, the portion where the inner ends of the bottom edges of the two side surfaces of the same side surface meet each other is flush with the hemming bending line of the corresponding side in the height direction.

[0019] By adopting the above technical solution, the portion where the inner ends of the bottom edges of the two side surfaces of the same side surface are connected to each other is set to be flush with the bending line of the edge of the corresponding side in the height direction, thereby making the connection strength between the bottom edge and the two corresponding side surfaces higher.

[0020] Furthermore, in an embodiment of a three-dimensional bag, each bottom edging includes a lower extension section extending along the height direction, and an upper extension section extending in a direction away from the bottom surface at an angle relative to the height direction, the lower end of the lower extension section is connected to the corresponding end of the edging bending line on the corresponding side, and the upper end is connected to the lower end of the upper extension section.

[0021] By adopting the above technical solution, the lower extension section is set to connect the two side edges of the bottom edging with their respective corresponding front faces, so that there will be no gap between the two side edges of the lower end of the bottom edging in the height direction and their respective corresponding front faces, thereby improving the sealing of the bag body.

[0022] Furthermore, by arranging the upper extension section to extend in a direction away from the bottom surface at an inclination relative to the height direction, an avoidance area is formed between the upper extension section and the corresponding front surface. When the two side surfaces are plugged into and fixed to each other and need to be moved in the height direction, friction between the upper extension section and the corresponding front surface can be avoided through the avoidance area.

[0023] Furthermore, in an embodiment of a three-dimensional bag, the extension height of the lower extension section in the height direction is equal to or greater than the first predetermined distance, so that there will be no gap between the two side edges of the bottom edging and their corresponding side surfaces, further improving the sealing of the bag body.

[0024] Furthermore, in an embodiment of the three-dimensional bag, bag opening folds are formed on the tops of the front and two side panels of each side surface, and the opposite ends of the bag opening folds of the two side panels in the thickness direction are plugged and fixed to each other.

[0025] In addition, an avoidance notch is provided on the top edge of one of the two side surfaces. When the pocket folds of the two side surfaces are overlapped and fixed to each other, the overlapping area of the pocket fold of the other side surface at least partially surrounds the avoidance notch, and the top edges of the two side surfaces are aligned with each other in the height direction.

[0026] By adopting the above technical solution, a bag opening fold is formed at the top of the two side surfaces of the front and each side. This not only increases the strength and durability of the bag opening, but also provides additional support for the closure of the bag opening. The bag opening fold can make the edge of the bag opening neat and smooth, thereby improving the overall aesthetics of the three-dimensional bag.

[0027] Furthermore, when the pocket folds of the two side surfaces are plugged into each other, the overlapping area of the pocket fold of the other side surface can at least partially surround the avoidance gap, so that the pocket folds of the two side surfaces overlap each other, thereby fixing the two side surfaces to each other; and, the overlapping area of the pocket fold of the other side surface can at least partially surround the avoidance gap, thereby achieving alignment of the top edges of the two side surfaces in the height direction, thereby making the height of each position of the top edge of the pocket fold the same, thereby making the top edge of the pocket fold more neat and smoothly transition, which not only improves the aesthetics of the bag opening, but also makes the overall aesthetics of the three-dimensional bag higher.

[0028] Furthermore, in an embodiment of a three-dimensional bag, the avoidance gaps on the two sides are symmetrically arranged relative to the midline of the bag body in the width direction; and the two side edges of each avoidance gap are symmetrically arranged relative to the bending line of the bag opening fold of a side surface.

[0029] By adopting the above technical solution, by setting the avoidance gaps on the two side surfaces symmetrically relative to the center line of the bag body in the width direction, when a pair of side surfaces of the bag body are formed, when the two side surfaces of each side surface are overlapped with each other, the top edge of at least one side surface of each side surface can be synchronously positioned at least partially within the avoidance gap, so that the top edges of the two side surfaces corresponding to a pair of side surfaces are aligned with each other in the height direction at the same time, which has the advantage of high forming efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic structural diagram of a three-dimensional bag provided by an embodiment of the present invention;

[0031] Figure 2 A schematic structural diagram of two unfolded side faces of a three-dimensional bag provided by an embodiment of the present invention;

[0032] Figure 3 A partial schematic diagram of a side face (the second predetermined distance is greater than the first predetermined distance) and a bottom hem when viewed along the width direction of the three-dimensional bag provided by an embodiment of the present invention;

[0033] Figure 4 A partial schematic diagram of a three-dimensional bag provided by an embodiment of the present invention, showing a pair of side faces unfolded, with the outer edge of the lower extension section of the bottom hem aligned with the side bending line of the corresponding side;

[0034] Figure 5 A partial schematic diagram of a side face (where the inner ends of the bottom edges of the two side faces meet at a height level with the hemming bend line of the corresponding side) and the bottom hemming of a three-dimensional bag provided by an embodiment of the present invention, when viewed along the width direction of the bag body;

[0035] Figure 6 A partial schematic diagram of a three-dimensional bag provided by an embodiment of the present invention, showing a pair of side faces unfolded, with the outer edge of the lower extension section of each bottom hem being spaced a third predetermined distance from the side bending line of the corresponding side in the thickness direction;

[0036] Figure 7 A partial schematic diagram of two side panels of a three-dimensional bag provided by an embodiment of the present invention before being overlapped;

[0037] Figure 8 for Figure 7 Enlarged view of part A;

[0038] Figure 9 A partial schematic diagram of two side panels of a three-dimensional bag provided by an embodiment of the present invention after being overlapped;

[0039] Figure 10 A schematic diagram of the overall structure of a three-dimensional bag provided by an embodiment of the present invention when a handle is provided.

[0040] Description of reference numerals:

[0041] 1. Three-dimensional bag;

[0042] 10. Bag body;

[0043] 11. Front;

[0044] 12. Side view;

[0045] 120, side facet; 121, side bend line; 122, notch area; 123, arc segment;

[0046] 13. Bottom surface;

[0047] 130, bottom bending line; 131, bottom hemming; 132, hemming bending line; 133, lower extension section; 134, upper extension section;

[0048] 14. Folding the bag opening;

[0049] 140. Avoidance gap; 141. Rectangular portion; 142. Transition portion;

[0050] 15. Handle. DETAILED DESCRIPTION

[0051] As described in the background art, after a three-dimensional bag is formed, it is generally necessary to fold the bag. To make the bag occupy less space, the three-dimensional bag is generally folded by folding a pair of side surfaces so that the bottom surface is folded inward and the pair of front surfaces are fitted together. However, since the bottom surface is fixedly connected to its corresponding side surfaces via connectors, and both the side surfaces and the bottom surface will bend and deform during the folding process, and since the bottom of the side surface is attached to one side of the connector, the side surface covers the bending line (crease line) between the connector and the bottom surface, which results in significant squeezing at the connection between the side surface and the bottom surface, especially at the corners of the bag. Multiple layers of sheet material (bottom surface, side surfaces, and connectors) are seriously piled up, which is not easy to fold. On the other hand, the folded three-dimensional bag will bulge at the corners due to the stacking of materials, making the three-dimensional bag not flat after folding and not easy to stack and pack.

[0052] To solve the above-mentioned problem, the present invention provides a three-dimensional bag, wherein the outer end of the bottom edge of each side facet is offset from the bottom fold line of the corresponding side in the height direction and is located a first predetermined distance above the bottom fold line, and the inner end extends toward the inner side of the bag body in the thickness direction, so that a notch area is formed between the bottom edge of each side facet and the corresponding bottom fold line. As a result, during the folding process of the three-dimensional bag, the force distribution of the sheet material at the corner of the bag is changed when it is bent, and part of the sheet material at the bottom of each side facet is removed, so that the number of sheet material layers in the bag corner bending area is reduced, and the stress is dispersed along the edge of the notch area, making it easier to fold. In addition, because a notch area is formed between the bottom edge of each side facet and the corresponding bottom fold line, the notch area provides deformation space for the sheet material at the corner of the bag to bend; it also makes the bag body flatter after folding, which is convenient for subsequent stacking and storage.

[0053] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0054] like Figure 1-Figure 3 As shown, the overall structure of this three-dimensional bag is first described.

[0055] A three-dimensional bag 1 includes a bag body 10, the bag body 10 includes a pair of front faces 11 arranged opposite to each other in the thickness direction W of the bag body 10, a pair of side faces 12 arranged opposite to each other in the width direction L of the bag body 10, and a bottom surface 13 arranged at the bottom of the bag body 10; wherein the pair of front faces 11 are connected by a pair of side faces 12, a bottom bending line 130 is formed between the bottom surface 13 and the pair of front faces 11, and bottom wrapping members are extended on both sides of the bottom surface 13 in the width direction L and fixedly connected to the bottom ends of the corresponding side faces 12. Edge 131, a folding line 132 is formed between each bottom folding edge 131 and the corresponding side end of the bottom surface 13; and each side surface 12 includes two side facets 120 that are overlapped and fixed to each other, and a side folding line 121 is formed between each side facet 120 and its corresponding front surface 11. The outer wall surface of each bottom folding edge 131 is overlapped and fixed to the inner wall surface of the corresponding two side facets 120, thereby enhancing the connection strength between the bottom surface 13 and the side surface 12, thereby improving the carrying capacity of the three-dimensional bag 1. It should be understood that Figure 1-Figure 3 The reference numeral L in the figure represents the width direction of the bag body 10 , the reference numeral W represents the thickness direction of the bag body 10 , and the reference numeral H represents the height direction of the bag body 10 .

[0056] Specifically, when viewed along the width direction L, the outer end portion of the bottom edge of each side facet 120 is offset from the bottom bending line 130 on the corresponding side in the height direction H of the bag body 10 and is located a first predetermined distance above the bottom bending line 130, and the inner end portion extends toward the inner side of the bag body 10 along the thickness direction W; thereby, a notch area 122 is formed between the bottom edge of each side facet 120 and its corresponding bottom bending line 130, thereby changing the force distribution of the sheet material at the bag corner when the three-dimensional bag 1 is bent during the folding process. When the traditional three-dimensional bag 1 is folded, the connection part (bag corner) between the bottom face 13 and the side face 12 is piled up due to the superposition of multiple layers of sheet material (bottom face 13 + side face 12 + connector), resulting in local stress concentration. A notch area 122 is formed between the bottom edge of each side panel 120 of the three-dimensional bag 1 of the present application and the corresponding bottom bending line 130, thereby removing part of the sheet material at the bottom of each side panel 120, reducing the number of sheet material layers in the bending area of the bag corner, and dispersing the stress along the edge of the notch area 122, making it easier to fold.

[0057] It should be understood that the outer end of the bottom edge of each side face 120 is: the end of each side face 120 close to the front face 11 connected to it in the thickness direction W; the inner end is: the end of each side face 120 away from the front face 11 connected to it in the thickness direction W; specifically, the bottom edge of the side face 120 can refer to Figure 3 Label number 124 in.

[0058] Furthermore, since a notch 122 is formed between the bottom edge of each side face 120 and its corresponding bottom bend line 130, the notch 122 provides space for the sheet material at the bag corner to bend. When the bag body 10 is folded, the multiple layers of sheet material at the corner would otherwise be compressed. The presence of the notch 122 allows the sheet material to move toward the notch 122, reducing the amount of sheet material at the corner stacking toward the outside of the bag body 10 and thus reducing the protruding height of the bag corner. This, on the one hand, reduces resistance during manual or mechanical folding, making folding easier. On the other hand, it also makes the bag body 10 flatter after folding, making it easier to stack and store.

[0059] More specifically, the lower ends of the two side edges of each bottom edging 131 in the thickness direction W are respectively connected to the corresponding ends of the bottom bending line 130 on the corresponding side, and the upper ends extend along the height direction H toward and away from the bottom surface 13; this ensures that there is no gap between the two side edges of the bottom surface 13 in the width direction L and the corresponding bottom edging 131, the sealing of the bottom surface 13 is higher, and the connection strength between the two side edges of the bottom surface 13 in the width direction L and the corresponding bottom edging 131 is higher, thereby improving the carrying capacity of the three-dimensional bag 1.

[0060] Moreover, since the outer end portion of the bottom edge of each side face 120 is offset from the bottom bending line 130 on the corresponding side in the height direction H, and the lower ends of the two side edges of each bottom edging 131 in the thickness direction W are respectively connected to the corresponding ends of the bottom bending line 130 on the corresponding side, therefore, in the thickness direction W, the outer end portion of the bottom edge of each side face 120 and the lower ends of the two side edges of the corresponding bottom edging 131 in the thickness direction W are offset from each other, so that during the forming process of the bag body 10, the two side edges of the side face 12 will not interfere with the bottom edging 131.

[0061] It should be noted that the bag angle of the bag body 10 in this application is the angle between the bottom edge 131 and the bottom surface 13; the bag angle in the prior art is: the angle between the bottom edge 131 and the side surface 12 and the bottom surface 13.

[0062] In summary, the advantages of this three-dimensional bag 1 are that the connection strength between the bottom surface 13 and the side surface 12 is enhanced by setting the bottom edging 131, thereby improving the carrying capacity of the three-dimensional bag 1; a notch area 122 is formed between the bottom edge of each side face 120 and the corresponding bottom bending line 130, thereby reducing the number of sheet material layers in the bag corner bending area, and the stress is dispersed along the edge of the notch area 122, reducing the resistance during manual or mechanical folding, and also making the bag body 10 flatter after folding, and the bag body 10 has better aesthetics and is convenient for subsequent stacking and storage; there is no notch between the two side edges of the bottom surface 13 in the width direction L and the corresponding bottom edging 131, and the sealing of the bottom surface 13 is higher; the outer end of the bottom edge of each side face 120 and the lower end of the two side edges of the corresponding bottom edging 131 in the thickness direction W are staggered with each other, so that during the molding process of the bag body 10, the two side edges of the side surface 12 will not interfere with the bottom edging 131.

[0063] Optionally, in a feasible implementation, as Figure 3 As shown, to ensure the connection strength between each side facet 120 and the bottom edging 131, a first predetermined distance in the height direction H between the outer end of the bottom edge of each side facet 120 and the bottom bending line 130 on the corresponding side is set to 2 to 4 times the thickness of the bag body 10 sheet material; thus, the first predetermined distance can be selected according to the size of the bag body 10; for example, if the bag body 10 is large and there is more space for items to be contained, the first predetermined distance should be set to a smaller value, such as 2 or 2.5 times the thickness of the bag body 10 sheet material, to ensure the connection strength between each side facet 120 and the bottom edging 131; when the bag body 10 is small and there is less space for items to be contained, the first predetermined distance can be set to a larger value, such as 3 or 4 times the thickness of the bag body 10 sheet material, to reduce the use of sheet material and reduce costs.

[0064] It should be understood that the sheet material of the bag body 10 can be non-woven fabric, paper, etc., and this embodiment does not limit this. The thickness of the sheet material of the bag body 10 can be 0.3mm, 0.5mm, 0.6mm, etc. For example, when the thickness of the sheet material is 0.3mm, the first predetermined distance can be 0.6mm, 0.9mm, etc.

[0065] The following further explains the configuration of the inner end portion of the bottom edge of each side surface 120 .

[0066] Alternatively, in one embodiment, Figure 3 and Figure 4 The inner end of the bottom edge of each side facet 120 extends obliquely relative to the thickness direction W, and the inner end of the bottom edges of the two side facets 120 of the same side facet 12 are connected to each other. Therefore, the inner end of the bottom edge of each side facet 120 can be selected to extend obliquely upward or downward relative to the thickness direction W according to production requirements. When the sheet thickness of the three-dimensional bag 1 is large, and the gap area 122 formed between the bottom edge of each side facet 120 and the corresponding bottom bending line 130 needs to be larger, the inner end of the bottom edge of each side facet 120 can be set to extend obliquely upward relative to the thickness direction W. When the sheet thickness of the three-dimensional bag 1 is small, and the gap area 122 formed between the bottom edge of each side facet 120 and the corresponding bottom bending line 130 needs to be smaller to achieve a higher connection strength between the bottom surface 13 and the side surface 12, the inner end of the bottom edge of each side facet 120 can be set to extend obliquely downward relative to the thickness direction W.

[0067] More specifically, the portion where the inner ends of the bottom edges of the two side panels 120 of the same side surface 12 meet each other is located a second predetermined distance above the bottom bending line 130 in the height direction H, thereby maximizing the size of the notch area 122 formed between the bottom edge of each side panel 120 and the corresponding bottom bending line 130 in the thickness direction W, thereby making the bag body 10 easier to fold.

[0068] Moreover, in the height direction H, the second predetermined distance is 1 to 2 times larger than the first predetermined distance of the sheet thickness dimension of the bag body 10; when the two side surfaces 120 are plugged and fixed to each other in the thickness direction W, since the sheets in the plug-in area of the bottom edges of the two side surfaces 120 will be accumulated, the second predetermined distance is set to be 1 to 2 times larger than the first predetermined distance of the sheet thickness dimension of the bag body 10, so that the bottom edges of the two side surfaces 120 are surrounded to form an inverted "V"-shaped opening, so that when the bag body 10 is folded, the inverted "V"-shaped opening can provide more deformation space for the sheet bending at the bag corners, thereby ensuring that the bag corners will not bulge, making the bag body 10 more beautiful.

[0069] It should be understood that the size setting of the second predetermined distance needs to be based on the thickness of the sheet. For example, when the thickness of the sheet is 0.3mm, the first predetermined distance is designed to be 0.6mm. At this time, the second predetermined distance can be 0.9mm, 1.05mm, 1.2mm, etc. This embodiment does not limit this.

[0070] Alternatively, in another embodiment, Figure 5 and Figure 6 The inner end portion of the bottom edge of each side surface 120 extends obliquely relative to the thickness direction W, and the inner end portions of the bottom edges of the two side surfaces 120 of the same side surface 12 are connected to each other.

[0071] Furthermore, the area where the inner ends of the bottom edges of the two side facets 120 of the same side face 12 meet is flush with the hemming bend line 132 of the corresponding side in the height direction H. The bottom edges of the two side facets 120 are connected to form a "V" shape, maximizing the connection area between each bottom hemming 131 and its two corresponding side facets 120 and improving the connection strength between each bottom hemming 131 and its two corresponding side facets 120.

[0072] Specifically, after the opposite ends of the two side surfaces 120 in the thickness direction W are plugged into each other, when the bag body 10 is folded, a middle bending line extending along the height direction H will be formed on the side surface 12 .

[0073] More specifically, in the height direction H, the lower end of the central bending line is connected to the inner end portions of the bottom edges of the corresponding two side panels 120, and is also connected to the corresponding edge bending line 132. When the bag body 10 is folded, the side surface 12 is folded toward the inside of the bag body 10 along the central bending line. At this time, because the top ends of the bottom edges of the two side panels 120 are connected to each other to form a "V"-shaped tip, when the side surface 12 is folded toward the inside of the bag body along the central bending line, the middle portion of the edge bending line 132 bends inward. The tip formed by the inner ends of the bottom edges connecting to each other applies stress toward the middle portion of the edge bending line 132. Therefore, when the bottom surface 13 and the side surface 12 are bent inward at the same time, the sheet material in the middle portion of the edge bending line 132 bends inward more easily without causing paper stacking, thereby making the folded bag body 10 flatter and improving the aesthetics of the three-dimensional bag 1.

[0074] The following describes how to dispose the bottom edge 131 .

[0075] In one embodiment, Figure 3 and Figure 4Each bottom edge 131 includes a lower extension section 133 extending along the height direction H, and an upper extension section 134 extending along a direction away from the bottom surface 13 at an angle relative to the height direction H; the lower end of the lower extension section 133 is connected to the corresponding end of the edge bending line 132 on the corresponding side, and the upper end is connected to the lower end of the upper extension section 134.

[0076] Specifically, by setting the lower extension section 133, the two side edges of the bottom edging 131 can be connected to their respective corresponding front faces 11, so that there will be no gap between the two side edges of the upper and lower ends of the bottom edging 131 in the height direction H and their respective corresponding front faces 11, thereby improving the sealing of the bag body 10.

[0077] More specifically, by setting the upper extension section 134 to extend obliquely relative to the height direction H in a direction away from the bottom surface 13, an avoidance area is formed between the upper extension section 134 and the corresponding front surface 11. When the two side surfaces 120 are plugged into and fixed to each other and need to move along the height direction H, the avoidance area can avoid friction between the upper extension section 134 and the corresponding front surface 11.

[0078] Optionally, in a feasible embodiment, the extension height of the lower extension section 133 in the height direction H is equal to or greater than the first predetermined distance, so that there is no gap between the two side edges of the bottom edging 131 and their corresponding side surfaces 120, thereby further improving the sealing of the bag body 10.

[0079] The following explains the arrangement of the lower extension section 133 when the extension height of the lower extension section 133 in the height direction H is equal to or greater than the first predetermined distance.

[0080] Optionally, in one embodiment, when viewed along the width direction L, as shown in FIG. Figure 3 and Figure 4 As shown, the outer edge of the lower extension section 133 of each bottom edging 131 is aligned with the side bending line 121 on the corresponding side, so that the outer edge of the lower extension section 133 of each bottom edging 131 is connected to the front side 11 on the corresponding side and there is no gap between each front side 11, thereby ensuring the sealing of the three-dimensional bag 1.

[0081] Alternatively, in one embodiment, Figure 5 and Figure 6As shown, the outer end of the bottom edge of each side face 120 and the corresponding end of the bottom bending line 130 on the corresponding side, as well as the lower end of the lower extension section 133 and the corresponding end of the bottom bending line 130 are connected by an arc segment 123. Through the arc segment 123, the arc segment 123 can disperse the stress between the outer end of the bottom edge of each side face 120 and the corresponding end of the bottom bending line 130 on the corresponding side, as well as the stress between the lower end of the lower extension section 133 and the corresponding end of the bottom bending line 130 when the accommodating cavity of the bag body 10 is filled with items, thereby making the bag body 10 not easily torn, thereby ensuring the structural strength of the bag body 10.

[0082] Specifically, when viewed along the width direction L, the outer edge of the lower extension section 133 of each bottom hem 131 is spaced apart from the side fold line 121 on the corresponding side by a third predetermined distance in the thickness direction W. The third predetermined distance is 1 to 2 times the thickness of the bag body 10. This reduces the risk of friction between each lower extension section 133 and the front surface 11 on the corresponding side when the bottom hem 131 is folded during the bag body 10 forming process. It should be understood that the third predetermined distance is determined based on the thickness of the sheet. For example, when the sheet thickness is 0.3 mm, the third predetermined distance can be 0.3 mm, 0.6 mm, etc.; when the sheet thickness is 0.4 mm, the third predetermined distance can be 0.4 mm, 0.8 mm, etc. This is not limited in this embodiment.

[0083] Furthermore, the configuration of the bag body 10 is further explained below.

[0084] In one embodiment of the three-dimensional bag 1, as Figure 2 As shown, the tops of the front face 11 and the two side panels 120 of each side face 12 are formed with pocket folds 14 , and the opposite ends of the pocket folds 14 of the two side panels 120 in the thickness direction W are plugged and fixed to each other.

[0085] Moreover, a top edge of one of the two side faces 120 is provided with an avoidance notch 140. When the bag opening folding edges 14 of the two side faces 120 are overlapped and fixed to each other (such as Figure 7 As shown), the overlapping area of the pocket fold 14 of the other side face 120 of the two side face 120 at least partially surrounds the avoidance gap 140, and the top edges of the two side face 120 are aligned with each other in the height direction H (as shown). Figure 9 shown).

[0086] Specifically, by forming a bag opening fold 14 on the top of the two side surfaces 120 of the front face 11 and each side face 12, not only can the strength and durability of the bag opening be increased, but the bag opening fold 14 can also provide additional support for the closure of the bag opening, and the bag opening fold 14 can make the edge of the bag opening neat and smooth, thereby improving the overall aesthetics of the three-dimensional bag 1.

[0087] More specifically, when the pocket folds 14 of the two side surfaces 120 are plugged into each other, the overlapping area of the pocket fold 14 of the other side surface 120 can at least partially surround the avoidance gap 140, so that the pocket folds 14 of the two side surfaces 120 overlap each other, thereby fixing the two side surfaces 120 to each other; and, the overlapping area of the pocket fold 14 of the other side surface 120 at least partially surrounds the avoidance gap 140, thereby achieving the top edges of the two side surfaces 120 to be aligned with each other in the height direction H, thereby making the height of each position of the top edge of the pocket fold 14 the same, thereby making the top edge of the pocket fold 14 more neat and smoothly transitioned, which not only improves the aesthetics of the bag opening, but also makes the overall aesthetics of the three-dimensional bag 1 higher.

[0088] Optionally, in a feasible embodiment, in order to make the connection strength of the two side surfaces 120 higher after being overlapped and fixed to each other, an avoidance notch 140 is opened at the top edge of one of the side surfaces 120 of the two side surfaces 120. When the pocket folds 14 of the two side surfaces 120 are overlapped and fixed to each other, the overlapping area of the pocket fold 14 of the other side surface 120 of the two side surfaces 120 is at least partially inserted into the avoidance notch 140 along the height direction H, so that the overlapping area of the pocket fold 14 of the other side surface 120 can be limited by the avoidance notch 140, thereby further improving the connection strength between the two side surfaces 120.

[0089] Optionally, in a feasible implementation, as Figure 2 As shown, the avoidance notches 140 of the two side surfaces 12 are symmetrically arranged relative to the midline of the bag body 10 in the width direction L; thereby, when a pair of side surfaces 12 of the bag body 10 are formed, when they are overlapped with each other through their respective two side facets 120, the top edge of at least one side facet 120 of each side surface 12 can be synchronously positioned at least partially within the avoidance notch 140, so that the top edges of the two side facets 120 corresponding to each of the pair of side surfaces 12 are simultaneously aligned with each other in the height direction H, which has the advantage of high forming efficiency.

[0090] Furthermore, the two side edges of each escape notch 140 are symmetrically arranged relative to the bending line of the pocket opening fold 14 of one side face 120. This allows the pocket opening fold 14 of the other side face 12 to accurately surround the escape notch 140, and avoids the problem of the pocket opening fold 14 of the other side face 12 protruding from the pocket opening edge in the height direction H after surrounding the escape notch 140 due to the different heights of the two side edges of the escape notch 140 in the width direction L.

[0091] Optionally, in a feasible implementation, as Figure 10 As shown, to facilitate carrying of the handbag, the three-dimensional bag 1 further includes a handle 15. Two handle perforations are formed on the bag opening fold 14 of each front face 11 at a predetermined distance along the width direction L. The ends of the handle 15 pass through the corresponding handle perforations and are secured to the inner wall of the front face 11 or the bag opening fold 14. Thus, the provision of the handle 15 facilitates carrying of the handbag. It should be understood that the predetermined distance can be 5 cm, 10 cm, 13 cm, etc., and this is not limited to this embodiment. Those skilled in the art can select the desired distance based on the size of the front face 11 of the three-dimensional bag 1.

[0092] The following further explains how to set the avoidance gap 140.

[0093] Optionally, in a feasible implementation, as Figure 7-Figure 9 As shown, the avoidance gap 140 extends inward from the edge of the top edge of one side surface 120 in the thickness direction W; and, when viewed along the width direction L, the avoidance gap 140 includes a rectangular portion 141 that is an overall rectangular gap, so that when the overlapping area of the pocket fold 14 of the other side surface 120 surrounds the avoidance gap 140, the end wall of the overlapping area of the pocket fold 14 of the other side surface 120 in the thickness direction W is abutted against a side wall of the avoidance gap 140 in the thickness direction W, so that after the two side surfaces 120 are overlapped with each other, the overlapping area of the pocket fold 14 of the other side surface 120 completely surrounds the avoidance gap 140, and there is no gap at the top edge of the pocket fold 14, thereby ensuring the flatness and integrity of the top edge of the pocket fold 14, so that the overlapping area of the two side surfaces 120 is not easily torn.

[0094] Specifically, the height dimension of the rectangular portion 141 in the height direction H is equal to the thickness dimension of the bag body 10 sheet material, thereby ensuring that there is no height difference in the height direction H after the two side panels 120 overlap each other, resulting in a smooth top edge of the bag opening. Furthermore, the length dimension of the rectangular portion 141 in the thickness direction W is equal to the dimension of the overlapping area of the bag opening fold 14 of the other side panel 120 in the thickness direction W. As a result, after the two side panels 120 overlap each other, the avoidance gap 140 on one side panel 120 can be completely surrounded by the overlapping area of the bag opening fold 14 of the other side panel 120, and there is no gap at the top edge of the bag opening fold 14, further ensuring the flatness of the top edge of the bag opening fold 14 and improving the connection strength between the two side panels 120.

[0095] Optionally, in a feasible embodiment, the avoidance gap 140 also includes a transition portion 142, which is located at the inner end of the rectangular portion 141, is connected to the rectangular portion 141, and gradually decreases in height from the inner end of the rectangular portion 141 to transition to the top edge of a side surface 120.

[0096] Specifically, by providing the transition portion 142, on the one hand, the opening size of the avoidance gap 140 can be enlarged by the transition portion 142. When the two side surfaces 120 overlap each other, since the overlapping area of the pocket fold 14 of the other side surface 120 needs to surround the avoidance gap 140, it is necessary to move the two side surfaces 120 in the height direction H, or move one of the side surfaces 120, so that the two side surfaces 120 are plugged into each other. By providing the transition portion 142, the opening size of the avoidance gap 140 in the thickness direction W can be increased, thereby facilitating positioning; on the other hand, when the two side surfaces 120 overlap each other, the two side surfaces 120 are moved in the height direction H, or one of the side surfaces 120 is moved, and the transition portion 142 can guide the other side surface 120 of the two side surfaces 120 to surround the rectangular portion 141 and the transition portion 142, so that the two side surfaces 120 overlap each other and the top edges are aligned, thereby improving the overlapping rate between the two side surfaces 120.

[0097] It should be understood that the angle between the bottom wall surface and the side wall surface of the transition portion 142 ranges from 100° to 165°, such as 100°, 115°, 165°, etc., which is not limited in this embodiment.

[0098] More specifically, the length of the relief notch 140 in the thickness direction W is equal to the dimension of the overlapping region of the pocket fold 14 of the other side panel 120 in the thickness direction W. This allows the overlapping region of the pocket fold 14 of the other side panel 120 to completely surround the rectangular portion 141 and the transition portion 142. It should be understood that the rectangular portion 141 is formed on one side panel 120, and its inner end is located along the thickness direction W, proximal to the end of the front face 11 connected to the other side panel 120.

[0099] Optionally, in one embodiment, when viewed along the width direction L, the transition portion 142 is a triangular or fan-shaped notch as a whole, and the size of the transition portion 142 in the thickness direction W is equal to 0.5 to 2 times the thickness of the sheet material of the bag body 10.

[0100] Specifically, the transition portion 142 is a triangular or fan-shaped notch as a whole, so that when the two side surfaces 120 overlap each other, the end of the overlapping area of the bag fold 14 of the other side surface 120 in the thickness direction W can move smoothly into the rectangular portion 141.

[0101] It should be noted that the dimension of the transition portion 142 in the thickness direction W is equal to 0.5 to 2 times the thickness of the bag body 10 sheet material, and can be 0.5 times, 1 times, 2 times, etc. For example, when the thickness of the bag body 10 sheet material is 1 mm, the dimension of the transition portion 142 in the thickness direction W can be 0.5 mm, 1 mm, 2 mm, etc.

[0102] The above is an explanation of the embodiments of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this embodiment. On the contrary, the purpose of introducing the invention in conjunction with the embodiment is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the above description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[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 or explained in 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 inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[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 should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

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; wherein the pair of front faces are connected by the pair of side faces, a bottom bending line is formed between the bottom face and the pair of front faces, and bottom edging fixedly connected to the bottom ends of the corresponding side faces is extended on both sides of the bottom face in the width direction, and an edging bending line is formed between each of the bottom edging and the corresponding one side end portion of the bottom face; and each of the side faces comprises two side facets overlapped and fixed to each other, a side bending line is formed between each of the side facets and the corresponding front face, and the outer wall surface of each bottom edging is overlapped and fixed to the inner wall surface of the corresponding two side facets; wherein When viewed along the width direction, the outer end portion of the bottom edge of each side facet is offset from the bottom fold line on the corresponding side in the height direction of the bag body and is located a first predetermined distance above the bottom fold line, and the inner end portion extends toward the inner side of the bag body along the thickness direction, and a notch area is formed between the bottom edge of each side facet and the corresponding bottom fold line; and the lower ends of the two side edges in the thickness direction of each bottom hem are respectively connected to the corresponding ends of the bottom fold line on the corresponding side, and the upper ends extend along the height direction toward and away from the bottom face; Each of the bottom edgings includes a lower extension section extending along the height direction, and an upper extension section extending in a direction away from the bottom surface at an inclination relative to the height direction, the lower end of the lower extension section is connected to the corresponding end of the edging bending line on the corresponding side, and the upper end is connected to the lower end of the upper extension section; the two side edges of the bottom edging are connected to their respective corresponding front surfaces in the lower extension section.

2. The three-dimensional bag according to claim 1, characterized in that: in, The first predetermined distance in the height direction between the outer end of the bottom edge of each side face and the bottom bending line of the corresponding side is 2 to 4 times the thickness of the bag sheet.

3. The three-dimensional bag according to claim 2, characterized in that: in, The inner end portion of the bottom edge of each side facet extends obliquely relative to the thickness direction, and the inner end portions of the bottom edges of two side faces on the same side facet are connected to each other; and The portion where the inner ends of the bottom edges of the two side panels of the same side face are connected to each other is located a second predetermined distance above the bottom bending line in the height direction, and the second predetermined distance in the height direction is 1 to 2 times the thickness of the bag sheet material that is larger than the first predetermined distance.

4. The three-dimensional bag according to claim 2, characterized in that: in, The inner end portion of the bottom edge of each side facet extends obliquely relative to the thickness direction, and the inner end portions of the bottom edges of two side faces on the same side facet are connected to each other; and The portion where the inner ends of the bottom edges of the two side facets of the same side face are connected to each other is flush with the hemming bending line of the corresponding side in the height direction.

5. The three-dimensional bag according to claim 1, characterized in that: in, An extending height of the lower extending section in the height direction is equal to or greater than the first predetermined distance.

6. The three-dimensional bag according to claim 5, characterized in that: in, When viewed along the width direction, the outer edge of the lower extension section of each bottom hem is aligned with the side bending line of the corresponding side.

7. The three-dimensional bag according to claim 5, characterized in that: in, The outer end of the bottom edge of each side face and the corresponding end of the bottom bending line on the corresponding side, as well as the lower end of the lower extension section and the corresponding end of the bottom bending line are connected by an arc segment; and When viewed along the width direction, the outer edge of the lower extension section of each bottom edging is spaced a third predetermined distance from the side bending line on the corresponding side in the thickness direction, and the third predetermined distance is 1 to 2 times the sheet thickness of the bag body.

8. The three-dimensional bag according to claim 2, wherein: in, 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 at opposite ends in the thickness direction; and An avoidance notch is provided at the top edge of one of the two side surfaces. When the pocket fold edges of the two side surfaces are overlapped and fixed to each other, the overlapping area of the pocket fold edge of the other side surface at least partially surrounds the avoidance notch, and the top edges of the two side surfaces are aligned with each other in the height direction.

9. The three-dimensional bag according to claim 8, characterized in that: The avoidance notch extends inward from the edge of the top edge of the one side surface in the thickness direction; and When viewed along the width direction, the avoidance gap includes a rectangular portion that is an overall rectangular gap, the height dimension of the rectangular portion in the height direction is equal to the thickness dimension of the sheet material of the bag body, and the length dimension of the rectangular portion in the thickness direction is equal to the dimension of the overlapping area of the bag opening fold of the other side surface in the thickness direction.

10. The three-dimensional bag according to claim 9, characterized in that: The avoidance gap further includes a transition portion, which is located at the inner end of the rectangular portion, is connected to the rectangular portion through the transition portion, and gradually decreases in height from the inner end of the rectangular portion to the top edge of the side face; wherein, The length of the avoidance notch in the thickness direction is equal to the length of the overlapping area of the bag opening fold of the other side surface in the thickness direction.

11. The three-dimensional bag according to claim 8, wherein: The avoidance notches on the two side surfaces are symmetrically arranged relative to the midline of the bag body in the width direction; and The two side edges of each of the avoidance gaps are symmetrically arranged relative to the bending line of the bag opening fold of the one side surface.

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