Forming die of three-dimensional bag

Abstract

The utility model discloses a forming die of a three-dimensional bag, the forming die is used for providing shape support for the three-dimensional bag in the process of forming a sheet material into the three-dimensional bag, the three-dimensional bag comprises a bottom surface, two front surfaces and two side surfaces, and each side surface is composed of two side split surfaces. A bag opening folded edge folded towards the inner side is formed at the top of a bag opening of the three-dimensional bag, and the corresponding ends of the bag opening folded edges at the tops of the two side split faces of each side face are connected in an inserted mode. The forming die comprises a bottom wall, two front side walls and two side face walls, wherein the two front side walls and the two side face walls are erected on the periphery of the bottom wall. Wherein each side face wall is further provided with a side face acting part, and the side face acting part applies attaching force to one of the two side faces of the side face forming the corresponding side so that the two side faces can be attached to each other when the bag opening folded edges at the tops are connected in an inserted mode. The side split surface acting part can apply an attaching force to one of the two side split surfaces in the inserting process so that the two side split surfaces can be attached together, and the inserting success rate is increased.

Description

Technical Field

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

[0002] As a common packaging container, the three-dimensional bag is widely used in industries such as retail, food, and clothing. Its structure generally includes a pair of front sides, a pair of side sides, and a bottom surface. Generally, a pair of front sides of the three-dimensional bag are connected to the bottom surface, and a pair of side sides are connected to the bottom surface through a connecting structure, so that a pair of front sides, a pair of side sides, and the bottom surface jointly enclose a cavity for accommodating articles.

[0003] The bag mouth of the three-dimensional bag usually receives more forces and is often torn by external forces. Therefore, in order to improve the strength of the bag mouth of the three-dimensional bag, more and more three-dimensional bags are provided with folded edges that are turned inward at the bag mouth. By setting the folded edges, not only can the strength and structural stability of the bag mouth of the three-dimensional bag be enhanced, but also the overall aesthetics of the three-dimensional bag can be improved. However, during the forming process of the three-dimensional bag with bag mouth folded edges, the bag mouth folded edges of the two side dividing surfaces need to be inserted and joined together. When being inserted and joined together by the forming die, it is possible that the bag mouth folded edges of the two side dividing surfaces that are inserted into each other interfere, resulting in deformation of the bag mouth folded edges of the three-dimensional bag that are inserted into each other, making the bag mouth folded edges unattractive, and even possibly causing the problem that the bag mouth folded edges of the two side dividing surfaces cannot be successfully inserted, resulting in defective bags.

[0004] Therefore, when inserting the bag mouth folded edges of the three-dimensional bag in the prior art, there may be a problem that the two side dividing surfaces interfere with each other and affect the insertion. Summary of the Utility Model

[0005] The purpose of this application is to solve the problem that when inserting the bag mouth folded edges of the three-dimensional bag in the prior art, there may be a problem that the two side dividing surfaces interfere with each other and affect the insertion.

[0006] To solve the above technical problems, an embodiment of this application discloses a forming die for a three-dimensional bag. The forming die is used to provide shape support for the three-dimensional bag during the process of forming a sheet material into a three-dimensional bag. The three-dimensional bag includes a bottom surface, two front sides, and two side sides. The two front sides are both connected to the bottom surface and are arranged oppositely. The two side sides are located on both sides of the two front sides, and each side side is composed of two side dividing surfaces; wherein, a bag mouth folded edge that is turned inward is formed at the top of the bag mouth of the three-dimensional bag, and the corresponding ends of the bag mouth folded edges at the top of the two side dividing surfaces of each side side are inserted into each other.

[0007] The forming die includes a bottom wall, and two front walls and two side walls erected on the periphery of the bottom wall. The bottom wall is adapted to the shape of the bottom surface of the three-dimensional bag, the two front walls are respectively adapted to the two front surfaces of the three-dimensional bag, and the two side walls are respectively adapted to the two side surfaces. Wherein, a side splitting surface acting part is further arranged on each side wall, and the side splitting surface acting part applies a fitting force to one of the two side splitting surfaces constituting the corresponding side surface, so that the two side splitting surfaces are mutually fitted when the bag mouth flanges at the top are inserted into each other.

[0008] With the above technical solution, in the present application, by arranging the side splitting surface acting part on the side wall, a fitting force can be applied to one of the two side splitting surfaces constituting the same side surface during the insertion process, and the two side splitting surfaces are closely fitted together under the action of the fitting force. Specifically, during the insertion process, the two side splitting surfaces need to be mutually displaced and reciprocally moved. At this time, the side splitting surface acting part ensures that the two side splitting surfaces always maintain a butting and fitting state by maintaining the fitting force, especially the inner wall surfaces of the inserted side splitting surface and the side splitting surface to be inserted near the top are closely fitted. Through this design, the problem of possible interference or insertion failure caused by the bag mouth flange of the side splitting surface to be inserted is effectively avoided, thereby significantly improving the insertion success rate.

[0009] Further preferably, an embodiment of the present application discloses a forming die for a three-dimensional bag. Each side splitting surface acting part includes a pushing part protruding outward from the corresponding side wall relative to the forming die. The pushing part has a pushing surface facing the outside of the forming die. When the bag mouth flanges at the top of the two side splitting surfaces are inserted into each other, the pushing surface abuts against the inner wall of one of the two side splitting surfaces closer to the forming die and applies a thrust away from the forming die to the abutted side splitting surface.

[0010] With the above technical solution, by arranging the pushing part protruding outward from the forming die and forming a pushing surface, during the insertion process of the side splitting surface, the pushing surface can provide a larger acting surface and the fitting force for the two side splitting surfaces to be closely fitted. The position of the pushing surface is fixed and can accurately act on the inner wall of one of the two side splitting surfaces closer to the forming die, so as to stably and efficiently provide the fitting force during each insertion process.

[0011] Further preferably, the pushing part is a pushing protrusion arranged on the corresponding side wall and extending along the height direction of the forming die. When the bag mouth flanges at the top of the two side splitting surfaces are inserted into each other, the upper end of the pushing protrusion abuts against the inner side wall of the bag mouth flange at the top of one of the two side splitting surfaces closer to the forming die.

[0012] The pushing protrusion is strip-shaped and extends along the height direction. A receiving groove adapted to the pushing protrusion is formed on the side wall, and the pushing protrusion is adapted to be received in the receiving groove.

[0013] An elastic member is further provided on one side of the pushing protrusion located in the receiving groove. One end of the elastic member abuts against the pushing protrusion, and the other end abuts against the bottom of the receiving groove. When the elastic member is compressed, the pushing protrusion can be completely received in the receiving groove.

[0014] With the above technical solution, the receiving groove can receive the pushing protrusion, and an elastic member is further provided, which can not only provide a force to the pushing protrusion and the inserted side dividing surface, but also the pushing protrusion can be compressed and received in the receiving groove when an external force is applied.

[0015] Further preferably, the elastic member includes a plurality of springs arranged at intervals in the height direction in the receiving groove. And at least one guide rod extending toward the forming die is further provided on one side of the pushing protrusion located in the receiving groove, and at least one guide groove adapted to the guide rod is provided in the receiving groove.

[0016] An embodiment of the present application also discloses a forming die for a three-dimensional bag. Each side dividing surface acting portion includes a blowing portion penetrating through a corresponding side wall. When the bag mouth flanges at the tops of the two side dividing surfaces are inserted into each other, the blowing portion blows air toward the inner wall of one side dividing surface closer to the forming die among the two side dividing surfaces. Wherein, the blowing portion includes a plurality of air blowing holes arranged at intervals in the height direction of the forming die. When the bag mouth flanges at the tops of the two side dividing surfaces are inserted into each other, at least the uppermost air blowing hole blows air toward the inner side wall of the bag mouth flange at the top of one side dividing surface closer to the forming die among the two side dividing surfaces.

[0017] An embodiment of the present application also discloses a forming die for a three-dimensional bag. Each side dividing surface acting portion includes a suction portion penetrating through a corresponding side wall. When the bag mouth flanges at the tops of the two side dividing surfaces are inserted into each other, the suction portion sucks air toward the inner wall of one side dividing surface farther from the forming die among the two side dividing surfaces. Wherein, the suction portion includes a plurality of suction holes arranged at intervals in the height direction of the forming die, and the uppermost suction hole is located below the bag mouth flange in the height direction of the forming die.

[0018] An embodiment of the present application also discloses a forming die for a three-dimensional bag. Wherein, the side dividing surface acting portion on each side wall is located in the middle of the side wall in the thickness direction of the forming die, and when viewed in a direction perpendicular to the side wall, the side dividing surface acting portion is located in the overlapping area of the two side dividing surfaces of the corresponding side of the three-dimensional bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural view of the three-dimensional bag provided by the embodiment of the present utility model;

[0020] Figure 2 is a schematic structural view of the forming die of the three-dimensional bag provided by the embodiment of the present utility model;

[0021] Figure 3 Schematic diagram of the structure of the three-dimensional bag provided by the embodiment of the present utility model during insertion;

[0022] Figure 4 Partial structure schematic diagram of the two side dividing surfaces of the three-dimensional bag provided by the embodiment of the present utility model during insertion;

[0023] Figure 5 Partial structure schematic diagram of the two side dividing surfaces of the three-dimensional bag provided by the embodiment of the present utility model after insertion;

[0024] Figure 6 Exploded view of the pushing protrusion of the forming die of the three-dimensional bag provided by the embodiment of the present utility model;

[0025] Figure 7 Schematic diagram of the structure of the forming die of the three-dimensional bag provided by the embodiment of the present utility model, where the side dividing surface acting part is a blowing part;

[0026] Figure 8 Schematic diagram of the structure of the forming die of the three-dimensional bag provided by the embodiment of the present utility model, where the side dividing surface acting part is a suction part.

[0027] Explanation of reference numerals:

[0028] 100, three-dimensional bag;

[0029] 110, bottom surface; 120, front surface; 130, side surface; 131, inserted side dividing surface; 132, side dividing surface to be inserted; 140, bag mouth hem;

[0030] 200, forming die;

[0031] 210, front wall; 220, side wall; 230, receiving groove;

[0032] 300, side dividing surface acting part;

[0033] 310, pushing part;

[0034] 311, pushing surface; 312, elastic member; 313, guide rod;

[0035] 320, blowing part;

[0036] 330, suction part;

[0037] A, height direction of the forming die. Detailed implementation manners

[0038] In some relatively common three-dimensional bags, a bag mouth hem that folds inward is provided at the bag mouth of the three-dimensional bag. By setting the bag mouth hem, the strength of the bag mouth and the structural stability can be enhanced. The side of this type of three-dimensional bag is generally composed of two side dividing surfaces. During the forming process of the three-dimensional bag, the tops of the two side dividing surfaces are generally inserted together. Specifically, one of the two side dividing surfaces is the inserted side dividing surface, and the other is the inserting side dividing surface. During the insertion process, the bag mouth hem of the inserted side dividing surface partially opens, and then the inserting side dividing surface is inserted between the bag mouth hem and the inner wall of the inserted side dividing surface to complete the insertion.

[0039] During the insertion process, it is generally completed by an insertion forming mold. The insertion forming mold will drive the inserting side dividing surface to first move downward and be misaligned, and then move upward and insert into the bag mouth hem of the inserted side dividing surface. However, during the insertion process, the inserted side dividing surface may come into contact and interfere with the bag mouth hem of the inserted side dividing surface, resulting in deformation of the bag mouth hem of the mutually inserted three-dimensional bags, making the bag mouth hem unsightly, and even possibly causing the problem of insertion failure.

[0040] To solve the above technical problems, the present application discloses a forming mold for a three-dimensional bag. A side dividing surface acting portion is provided on the side wall of the forming mold corresponding to the side of the three-dimensional bag. By applying a fitting force to one of the two side dividing surfaces that make up the corresponding side through the side dividing surface acting portion, the two side dividing surfaces are made to fit together during the side insertion forming process, avoiding the influence and interference of the inserting side dividing surface by the bag mouth hem of the inserted side dividing surface, and ensuring the success rate of each insertion.

[0041] It should be noted that the three-dimensional bags disclosed in the present application can be common paper bags, non-woven bags, plastic bags, etc., and this embodiment does not make specific limitations in this regard. Moreover, the three-dimensional bags disclosed in the present application can be provided with handles or without handles, and this embodiment does not make specific limitations in this regard.

[0042] To make the purpose, technical solution, and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0043] Please refer to Figure 1, first, the specific structure of the three-dimensional bag 100 disclosed in this application will be described: The three-dimensional bag 100 includes a bottom surface 110, two front surfaces 120, and two side surfaces 130. The two front surfaces 120 are both connected to the bottom surface 110 and are arranged oppositely. The two side surfaces 130 are located on both sides of the two front surfaces 120, and each side surface 130 is composed of two side sub-surfaces (the inserted side sub-surface 131 and the inserted-into side sub-surface 132); a bag mouth hem 140 that folds inward is formed at the top of the bag mouth of the three-dimensional bag 100. The corresponding ends of the bag mouth hems 140 at the tops of the two side sub-surfaces of each side surface 130 are inserted and fixed together. The bag mouth hem 140 enhances the strength of the bag mouth and the structural stability. When the bag mouth hems 140 at the tops of the two side sub-surfaces are inserted and fixed together, the connection strength of the overlapping area of the two side sub-surfaces is higher. It should be noted that the handle of the three-dimensional bag is not shown in this embodiment.

[0044] In the forming mold of the three-dimensional bag disclosed in the implementation manner of this embodiment, please refer to Figure 1 and Figure 2 , the forming mold 200 is used to provide shape support for the three-dimensional bag 100 during the process of forming the sheet material into the three-dimensional bag 100. Specifically, during the forming process of the three-dimensional bag 100, the forming mold 200 is wrapped in Figure 1 the three-dimensional bag 100 shown and provides shape support for the three-dimensional bag 100. Therefore, the forming mold 200 includes a bottom wall (not marked in the figure) and two front walls 210 and two side walls 220 erected on the periphery of the bottom wall. The bottom wall is adapted to the shape of the bottom surface 110 of the three-dimensional bag 100, the two front walls 210 are respectively adapted to the shapes of the two front surfaces 120 of the three-dimensional bag 100, and the two side walls 220 are respectively adapted to the two side surfaces 130.

[0045] Specifically, during the process of pressing the sheet material into the three-dimensional bag 100 and providing shape support by the forming mold 200, the forming mold 200 first presses the sheet material downward so that the two front surfaces 120 of the sheet material are attached to one side of the two front walls 210. Then, the side sub-surfaces located on both sides of the side wall 220 can be adsorbed and attached close to one side of the side wall 220 through the suction holes, or can be pushed close to one side of the side wall 220 by the side push plates. In this state, the two front surfaces 120 and the side sub-surfaces on both sides of the three-dimensional bag 100 are attached to the periphery of the forming mold 200, but the two side sub-surfaces of each side surface 130 are not inserted together.

[0046] Further refer to Figure 3, then the molding die 200 will drive the plug-in side facet 131 (a side facet closer to the side wall 220 of the molding die 200) to move downward first, move to the top of the plug-in side facet 131 below the pocket fold 140 of the plug-in side facet 132, and then move upward so that the plug-in side facet 131 is plugged into the pocket fold 140 of the plug-in side facet 132. During the plug-in process, the plug-in side facet 132 can be relatively fixed first, for example, it can be fixed by adsorption through the adsorption hole, or it can be relatively fixed by the front face 120 connected to the plug-in side facet 132 supported by the bag stripping belt, which is not specifically limited in this embodiment. During the movement process, the plug-in side facet 131 can be inserted sideways by reciprocating movement of one of the side walls of the molding die 200, or it can be reciprocated by clamping the plug-in side facet 131 with a clamp, or it can be inserted sideways by reciprocating movement driven by the bag stripping belt on the other side, which is not specifically limited in this embodiment.

[0047] For further information, see Figure 2 In the present application, a side facet acting part 300 is further provided on each side wall 220 of the molding die 200, that is, a side facet acting part 300 is provided on both side walls 220 of the molding die 200, and the side facet acting part 300 applies a fitting force toward one of the two side faces (e.g., the plug-in side facet 131) constituting the side face 130 of the corresponding side, so that the two side faces fit each other when the pocket folding edges 140 at the top are plugged into each other. By providing the side facet acting part 300 to apply a fitting force to the plug-in side facet 131, the plug-in side facet 131 and the plugged side facet 132 are closely attached to avoid interference with the pocket folding edge 140 of the plug-in side facet 132.

[0048] Specifically, in this embodiment, the side surface action portion 300 can be an elastic structure, such as an elastic sheet, an elastic plate, etc. By setting the elastic structure, a continuous fitting force can be applied to one of the two side surfaces. The side surface action portion 300 can also be set as other pushing protrusions or pushing structures, or can also be set as a blowing component, so as to apply a fitting force to one of the two side surfaces during the plug-in process. This embodiment does not make specific limitations on this.

[0049] For more detailed description, see Figure 4 The pocket folds 140 at the tops of the two side facets constituting the same side face 130 are to be plugged into each other, and there is an overlap area between the two side facets, and one of the two side facets is closer to the side wall 220 of the molding die 200 (the plugging side facet 131), and the other is farther from the side wall 220 of the molding die 200 (the plugged side facet 132). The side wall 220 of the molding die 200 is provided with a side facet action portion 300 (such as Figure 4When it is in the state shown by the dashed-line frame in the figure), it can apply a force to the plugging-side split surface 131 closer to the side wall 220, and the applied force is as shown by the dashed-line arrow in Figure 4 the figure. The plugging-side split surface 131 has a tendency to move away from the molding die 200 under the action of the force, and closely adheres to the plugged-side split surface 132 farther from the molding die 200. At this time, the force is the adhesion force that makes the plugging-side split surface 131 and the plugged-side split surface 132 adhere. When the plugging-side split surface 131 closer to the side wall 220 moves upward for plugging, since the top of the plugging-side split surface 131 is closely adhered to the inner wall of the plugged-side split surface 132, interference with the bag mouth hemming 140 at the top of the plugging-side split surface 131 can be avoided during the plugging process, thereby improving the plugging success rate of the side, and finally completing the plugging. After the plugging, it is as shown in Figure 5 the figure.

[0050] Correspondingly, refer to Figure 2 and Figure 4 . By providing the split surface acting portion 300 on the side wall 220, the present application can apply an adhesion force to one of the two split surfaces constituting the same side surface 130 during the plugging process, and the two split surfaces are closely adhered together under the action of the adhesion force. Specifically, during the plugging process, the two split surfaces need to be displaced and reciprocated relative to each other. At this time, the split surface acting portion 300 ensures that the two split surfaces always maintain an abutting and adhering state by maintaining the adhesion force, especially the inner wall surfaces of the plugging-side split surface 131 and the plugged-side split surface 132 near the top are closely adhered. This design effectively avoids the problems of interference or plugging failure that may be caused by the bag mouth hemming 140 of the plugged-side split surface 132, thereby significantly improving the plugging success rate.

[0051] Moreover, when the split surface acting portion 300 applies an adhesion force to the two split surfaces to make them closely adhered together, it will also increase the opening angle of the bag mouth hemming 140 of the plugged-side split surface 132, thereby improving the plugging efficiency.

[0052] Further preferably, in a preferred implementation manner disclosed in this embodiment, please refer to Figure 2 . Each split surface acting portion 300 includes a pushing portion 310 protruding outward from the corresponding side wall 220 toward the outside of the molding die 200. The pushing portion 310 has a pushing surface 311 facing the outside of the molding die 200. When the bag mouth hems 140 at the tops of the two split surfaces are plugged into each other, the pushing surface 311 abuts against the inner wall of one of the two split surfaces closer to the molding die 200 and applies a thrust away from the molding die 200 to the abutted split surface.

[0053] With the design of this structure, by setting the pushing portion 310 protruding outward from the outer side of the forming die 200 and forming a pushing surface 311, during the insertion process of the side splitting surface, the pushing surface 311 can provide a larger acting surface and the adhesive force for the close fitting of the two side splitting surfaces. The position of the pushing surface 311 is fixed and can accurately act on the inner wall of one side splitting surface closer to the forming die 200 among the two side splitting surfaces, thereby realizing the stable and efficient provision of the adhesive force during each insertion process.

[0054] Further preferably, please refer to Figure 2 and Figure 6 , the pushing portion 310 is a pushing protrusion provided on a corresponding side wall 220 and extending along the height direction of the forming die 200. When the pocket edge 140 at the top of the two side splitting surfaces is inserted into each other, the upper end of the pushing protrusion abuts against the inner side wall of the pocket edge 140 at the top of one side splitting surface closer to the forming die 200 among the two side splitting surfaces.

[0055] Specifically, refer to Figure 4 and Figure 5 A detailed description of the role played by the pushing protrusion during the insertion process of the two side splitting surfaces on each side of the three-dimensional bag 100: When the pocket edge 140 at the top of the two side splitting surfaces is inserted into each other, the pushing protrusion contacts one side splitting surface (insertion side splitting surface 131) closer to the forming die 200. When one side splitting surface (insertion side splitting surface 131) closer to the forming die 200 moves downward along the height direction of the forming die 200, the pushing protrusion will exert a force on one side splitting surface (insertion side splitting surface 131) closer to the forming die 200, causing the inner sides of one side splitting surface (insertion side splitting surface 131) closer to the forming die 200 and the other side splitting surface (inserted side splitting surface 132) farther from the forming die to abut against each other, and the pocket edge 140 of one side splitting surface (insertion side splitting surface 131) closer to the forming die 200 will be misaligned with the pocket edge 140 of the other side splitting surface (inserted side splitting surface 132) farther from the forming die 200 first, and then inserted into the pocket edge 140 of the inserted side splitting surface 132. One side splitting surface (insertion side splitting surface 131) closer to the forming die 200 continues to move upward to complete the insertion.

[0056] Therefore, in this embodiment, the pushing protrusion pushes against a side dividing surface (insertion side dividing surface 131) closer to the forming die 200, thereby increasing the success rate of inserting the insertion side dividing surface 131 into the hem 140 of the pocket of the to-be-inserted side dividing surface 132. When setting the pushing protrusion, the side dividing surface that the pushing protrusion pushes against and is closer to the forming die 200 can be located at a position below the hem 140; it can also be a position close to the position below the hem 140; or it can be the inner sidewall of the hem 140 at the top of the side dividing surface that the pushing protrusion pushes against and is closer to the forming die 200. Those skilled in the art can design according to actual requirements.

[0057] In one preferred implementation, it is set that the upper end of the pushing protrusion abuts against the inner sidewall of the hem 140 (i.e., the side of the hem 140 of the insertion side dividing surface 131 close to the forming die 200) at the top of the side dividing surface (insertion side dividing surface 131) that is closer to the forming die 200 among the two side dividing surfaces. With this structural design, the upper end of the pushing protrusion accurately pushes against the inner sidewall of the hem 140 at the top of the insertion side dividing surface 131, and the acting part of the upper end of the pushing protrusion is closer to the top of the insertion side dividing surface 131, which is more conducive to inserting the insertion side dividing surface 131 into the hem 140 of the to-be-inserted side dividing surface 132.

[0058] The pushing protrusion is strip-shaped and extends in the height direction. A receiving groove 230 adapted to the pushing protrusion is provided on the sidewall 220, and the pushing protrusion is adapted to be within the receiving groove 230. The height direction of the forming die 200 is as Figure 2 shown by direction A in

[0059] It should be noted that when the pushing protrusion pushes against the insertion side dividing surface 131 among the two side dividing surfaces, an outward acting force will be applied to make the inner wall surfaces of the insertion side dividing surface 131 and the to-be-inserted side dividing surface 132 fit together. Therefore, preferably, the upper end of the pushing protrusion is set to be below the hem 140 on the forming die 200. When pushing against the insertion side dividing surface 131, the insertion side dividing surface 131 fits together with the inner wall surface of the to-be-inserted side dividing surface 132 below the hem 140. When the pushing part 310 pushes against the inner wall of the side dividing surface (insertion side dividing surface 131) that is closer to the forming die 200, the situation of squeezing the hem 140 of the to-be-inserted side dividing surface 132 together will not occur, and the insertion success rate of the two side dividing surfaces is increased.

[0060] More specifically, after the side insertion is completed, the side pressing plates on both sides of the two sidewalls 220 of the forming die 200 will move towards the sidewalls 220 of the forming die 200, and then squeeze the side 130 of the three-dimensional bag 100, so that the overlapping parts of the two side dividing surfaces that have completed the insertion are bonded together to form the side 130.

[0061] Further preferably, the thickness dimension by which the pushing protrusion protrudes relative to the side wall 220 of the forming die 200 may be within the range of 2 to 6 mm. For example, it may be 2 mm, 3 mm, 6 mm, etc. The upper end of the pushing protrusion is set to be within the range of 5 to 10 mm below the bag mouth hem 140 on the forming die 200. For example, it may be 5 mm, 8 mm, 10 mm, etc. Those skilled in the art can design according to actual needs, and this embodiment does not make specific limitations thereon.

[0062] Even more preferably, please refer to Figure 6 , an elastic member 312 is further provided on one side of the pushing protrusion located in the receiving groove 230. One end of the elastic member 312 abuts against the pushing protrusion, and the other end abuts against the bottom of the receiving groove 230. Wherein, when the elastic member 312 is compressed, the pushing protrusion can be completely received in the receiving groove 230.

[0063] Specifically, 2, 3 or even more elastic members 312 can be arranged at intervals inside the pushing protrusion. The elastic members 312 can be common springs, elastic sheets, diaphragms, etc. With the design of the above structure, the receiving groove 230 can receive the pushing protrusion, and the elastic member 312 is further provided, which can not only provide a force to the pushing protrusion and the side split surface to be inserted, but also compress the pushing protrusion into the receiving groove 230 when subjected to an external force.

[0064] In the forming die of the three-dimensional bag disclosed in the present application, please refer to Figure 2 , the side split surface acting portion 300 (pushing protrusion) on each side wall 220 is located in the middle of the side wall 220 in the thickness direction of the forming die 200, and when viewed in a direction perpendicular to the side wall 220, the side split surface acting portion 300 is located within the overlapping area of the two side split surfaces of the corresponding side surface 130 of the three-dimensional bag 100.

[0065] With the design of this structure, the side split surface acting portion 300 (pushing protrusion) is located within the overlapping area of the two side split surfaces of the corresponding side surface 130 of the three-dimensional bag 100. When the side pressing plate moves towards the side wall 220 of the forming die 200 and squeezes the overlapping area of the two side split surfaces for bonding, the pushing protrusion is squeezed and the elastic member 312 is compressed. The pushing protrusion moves into the receiving groove 230, and the pushing protrusion will provide a reaction force under the action of the elastic member 312, making the overlapping area of the two side split surfaces bond more firmly.

[0066] Moreover, since the pushing protrusion disclosed in the present application has a certain protruding thickness relative to the side wall 220 of the forming die 200, after the side insertion and the bonding of the side surface 130 are completed to form the complete three-dimensional bag 100, the pushing protrusion on the side wall 220 of the forming die 200 jacks up the side surface 130 of the three-dimensional bag 100. At this time, the contact area between the side surface 130 of the three-dimensional bag 100 and the side wall 220 of the forming die 200 is small, and the inner wall of the side surface 130 of the three-dimensional bag 100 and the side wall 220 of the forming die 200 are jacked up, so it is easier to take out the bag.

[0067] Further preferably, please refer to Figure 6 , the elastic member 312 includes a plurality of springs disposed in the receiving groove 230 at intervals in the height direction. And at least one guide rod 313 extending toward the forming die 200 is disposed on one side of the pushing protrusion located in the receiving groove 230, and at least one guide groove adapted to the guide rod 313 is disposed in the receiving groove 230.

[0068] It can be seen from Figure 6 , in the forming die of the three-dimensional bag disclosed in a preferred implementation manner of this embodiment, the pushing protrusion is set as a strip-shaped protrusion with a pushing surface 311 on one end surface. Three springs are disposed at intervals on one side of the strip-shaped protrusion located in the receiving groove 230, and two guide rods 313 are also disposed at intervals. There are two guide grooves in the receiving groove 230. The guide rods 313 extend into the guide grooves. When the pushing protrusion is squeezed and the springs are compressed, the guide rods 313 extend into the guide grooves and provide guidance for the movement of the pushing protrusion.

[0069] It should be noted that in this embodiment, the function of setting the spring is that in the natural state, the spring will push out the pushing protrusion so that the pushing surface 311 protrudes from the plane where the side wall 220 is located. Under the action of an external force, the spring will compress and the pushing surface 311 will be flush with the side wall 220. After the external force is withdrawn, the spring will reset and push out the pushing protrusion. The function of setting the guide rod 313 and the guide groove can provide guidance for the movement of the pushing protrusion.

[0070] The embodiment of the present application also discloses a forming die of a three-dimensional bag. Please refer to Figure 7 , each side dividing surface acting portion 300 includes a blowing portion 320 penetrating through a corresponding side wall 220. When the bag mouth flanges 140 at the tops of the two side dividing surfaces are inserted into each other, the blowing portion 320 blows air toward the inner wall of one side dividing surface (inserting side dividing surface 131) closer to the forming die 200 among the two side dividing surfaces. Among them, the blowing portion 320 includes a plurality of air blowing holes arranged at intervals in the height direction of the forming die 200, and at least the uppermost air blowing hole blows air toward the inner side wall of the bag mouth flange 140 at the top of one side dividing surface closer to the forming die 200 among the two side dividing surfaces.

[0071] Specifically, in this embodiment, when the air blowing holes at the uppermost part blow air towards the inner wall of the bag mouth hem 140 closer to the top of one side dividing surface (insertion side dividing surface 131) of the forming die 200, the blowing force of the air blowing holes can accurately act on the inner wall of the bag mouth hem 140 of the insertion side dividing surface 131 (i.e., the side of the bag mouth hem 140 of the insertion side dividing surface 131 close to the forming die 200), making it easier for the top of the insertion side dividing surface 131 to be inserted into the bag mouth hem 140 of the to-be-inserted side dividing surface 132, and improving the insertion success rate of the two side dividing surfaces.

[0072] More specifically, in this embodiment, when multiple air blowing holes are provided in the air blowing part 320, the multiple air blowing holes are arranged at linear intervals in sequence. Four, six, seven or even more air blowing holes can be arranged at intervals, and preferably, the multiple air blowing holes are located in the overlapping area of the two side dividing surfaces of the side surface 130 on the corresponding side of the three-dimensional bag 100.

[0073] With this structural design, multiple air blowing holes are provided to blow air towards the insertion side dividing surface 131, providing an outward acting force to the insertion side dividing surface 131, making the insertion side dividing surface 131 and the to-be-inserted side dividing surface 132 abut, facilitating the insertion of the two side dividing surfaces more conveniently, improving the insertion accuracy, and improving the flatness of the side wall 220.

[0074] The embodiment of the present application also discloses a forming die for a three-dimensional bag. Please refer to Figure 8 , each side dividing surface acting part 300 includes a suction part 330 penetrating through the corresponding side wall 220. When the bag mouth hems 140 at the tops of the two side dividing surfaces are inserted into each other, the suction part 330 sucks air towards the inner wall of the side dividing surface (to-be-inserted side dividing surface 132) farther from the forming die 200 among the two side dividing surfaces. The suction part 330 includes multiple suction holes arranged at intervals in the height direction of the forming die 200, and the uppermost suction hole is located below the bag mouth hem 140 in the height direction of the forming die 200.

[0075] It should be noted that in this embodiment, when the suction part 330 is provided on the side wall 220, to improve the insertion success rate and insertion effect, the side dividing surface where the suction part 330 acts is different from the side dividing surface where the air blowing part 320 acts. The side dividing surface where the suction part 330 acts is the to-be-inserted side dividing surface 132. Therefore, the suction part 330 is arranged closer to the to-be-inserted side dividing surface 132 on the side wall 220 and away from the overlapping area of the two side dividing surfaces. When the suction part 330 applies a force towards the to-be-inserted side dividing surface 132, the inner wall of the to-be-inserted side dividing surface 132 and the insertion side dividing surface 131 are closely attached, improving the insertion success rate of the two side dividing surfaces.

[0076] Similarly, when the air suction part 330 is provided with a plurality of air suction holes, the plurality of air suction holes are arranged at linear intervals in sequence. Four, six, seven or even more air suction holes can be arranged at intervals, and the present embodiment does not make specific limitations on this.

[0077] It should be noted that, in addition to the implementation manners of the present utility model described in the above specific embodiments, those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Although the description of the present utility model is introduced in combination with the preferred embodiments, this does not mean that the features of this utility model are limited to this implementation manner. On the contrary, the purpose of introducing the utility model in combination with the implementation manner is to cover other alternatives or modifications that may be extended based on the claims of the present utility model. In order to provide a deep understanding of the present utility model, many specific details are included in the above description. The present utility model can also be implemented without using these details. In addition, in order to avoid confusion or obscuring the key points of the present utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0078] 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.

[0079] In the description of the present embodiment, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0080] The terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0081] In the description of the present embodiment, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be 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 the present embodiment can be understood according to specific situations.

[0082] Although the present utility model has been illustrated and described by referring to some preferred embodiments thereof, those of ordinary skill in the art should understand that the above content is a further detailed description of the present utility model in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present utility model is limited only to these descriptions. Those skilled in the art can make various changes in form and detail, including making several simple deductions or substitutions, without departing from the spirit and scope of the present utility model.

Claims

1. A forming mold for a three-dimensional bag, the forming mold is used to provide shape support for the three-dimensional bag during the process of forming a sheet into a three-dimensional bag, the three-dimensional bag comprises a bottom surface, two front surfaces and two side surfaces, the two front surfaces are connected to the bottom surface and are arranged opposite to each other, the two side surfaces are located on both sides of the two front surfaces, and each of the side surfaces is composed of two side facets; wherein, The top of the bag opening of the three-dimensional bag is formed with a bag opening folded inward, and the corresponding ends of the bag opening folded edges at the top of the two side surface of each side are plugged into each other; the characteristics are: The molding die comprises a bottom wall and two front walls and two side walls erected on the periphery of the bottom wall, wherein the bottom wall is adapted to the bottom shape of the three-dimensional bag, the two front walls are respectively adapted to the two front shapes of the three-dimensional bag, and the two side walls are respectively adapted to the two side faces; Each of the side walls is also provided with a side dividing surface acting portion, which applies a fitting force toward one of the two side dividing surfaces constituting the side surface of the corresponding side, so that the two side dividing surfaces fit each other when the bag opening folds at the top are inserted into each other.

2. The three-dimensional bag forming mold according to claim 1, characterized in that: Each of the side surface action portions includes a push portion protruding toward the outside of the molding die relative to a corresponding side wall; wherein The pushing portion has a pushing surface facing the outside of the forming mold. When the bag opening folded edges at the tops of the two side surfaces are inserted into each other, the pushing surface abuts against the inner wall of one of the two side surfaces that is closer to the forming mold, and applies a thrust away from the forming mold toward the abutted side surface.

3. The three-dimensional bag forming mold according to claim 2, characterized in that: The push-pushing portion is a push-pushing protrusion provided on a corresponding one of the side walls and extending along the height direction of the forming mold; When the bag opening folds at the tops of the two side surfaces are plugged into each other, the upper end of the pushing protrusion abuts against the inner side wall of the bag opening fold at the top of one of the two side surfaces closer to the forming mold.

4. The three-dimensional bag forming mold according to claim 3, characterized in that: The pushing protrusion is strip-shaped and extends along the height direction; The side wall is provided with a receiving groove adapted to the pushing protrusion, and the pushing protrusion is adapted to be in the receiving groove.

5. The three-dimensional bag forming mold according to claim 4, characterized in that: An elastic member is also provided on one side of the push-pull protrusion located in the receiving groove, one end of the elastic member abuts against the push-pull protrusion, and the other end abuts against the bottom of the receiving groove; wherein When the elastic member is compressed, the pushing protrusion can be completely received in the receiving groove.

6. The three-dimensional bag forming mold according to claim 5, characterized in that: The elastic member includes a plurality of springs located in the receiving groove and arranged at intervals along the height direction.

7. The three-dimensional bag forming mold according to claim 6, characterized in that: At least one guide rod extending toward the forming mold is further provided on one side of the push-against protrusion located in the receiving groove, and at least one guide groove matched with the guide rod is provided in the receiving groove.

8. The three-dimensional bag forming mold according to claim 1, characterized in that: Each of the side facet action parts comprises a blowing part penetrating through a corresponding side wall, and when the bag opening folds at the tops of the two side facets are plugged into each other, the blowing part blows toward the inner wall of one of the two side facets that is closer to the forming mold; wherein The blowing portion includes a plurality of blowing holes arranged at intervals along the height direction of the forming mold. When the bag opening folded edges at the top of the two side surfaces are plugged into each other, at least the uppermost blowing hole blows air to the inner side wall of the bag opening folded edge at the top of one of the two side surfaces that is closer to the forming mold.

9. The three-dimensional bag forming mold according to claim 1, characterized in that: Each of the side facet action parts comprises an air suction part penetrating through a corresponding side wall, and when the bag opening folds at the tops of the two side facets are plugged into each other, the air suction part sucks air toward the inner wall of one of the two side facets that is farther away from the forming mold; The air suction part includes a plurality of air suction holes arranged at intervals along the height direction of the forming mold, and the uppermost air suction hole is located below the bag opening fold in the height direction of the forming mold.

10. The three-dimensional bag forming mold according to any one of claims 2 to 9, characterized in that: in The side facet action portion on each of the side walls is located in the middle of the side wall in the thickness direction of the molding die; and When viewed in a direction perpendicular to the side wall, the side dividing surface action portion is located in an overlapping area of ​​two side dividing surfaces constituting the side surface of a corresponding side of the three-dimensional bag.

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