Vest bag

Abstract

The utility model provides a vest bag. The vest bag comprises two front faces which are oppositely arranged in the thickness direction, two side faces which are oppositely arranged in the width direction and a bag opening in the top. The bottom edges of the two front faces are fixedly connected together, and the two side edges of the two front faces in the width direction are connected together through the two side faces respectively. At least one of the two side faces comprises two side sub-faces, the edge of one side of each side sub-face in the width direction is connected with the edge of the corresponding front face, and a connecting edge extending in the height direction of the vest bag is formed on the edge of the other side of each side sub-face; and the two connecting edges on the same side surface are overlapped in the width direction and are fixedly connected together. Therefore, the connecting strength of the vest bag can be improved, the requirement for equipment positioning precision can be lowered, and the limitation of bag body material selection is lowered; and when the vest pocket is manufactured by utilizing the design, the qualified vest pocket can be manufactured without a subsequent trimming process, and the manufacturing cost can be reduced.

Description

Technical Field

[0001] This application relates to the field of container technology, and in particular to a vest bag. Background Technology

[0002] Vest bags are a common type of packaging bag, named for their vest-like shape and handles on both sides. They are also known as vest bags or tote bags. Widely used in daily life, they are lightweight, sturdy, have a large capacity, and are easy to carry, often used for shopping, packaging, and storage.

[0003] The manufacturing process of vest bags typically includes blown film forming, printing, sealing, and slitting. Each process affects the quality and appearance of the vest bag. Taking heat-sealing as an example, current vest bag manufacturing processes involve joining the side seams of the bag body together before sealing. This not only results in poor connection strength but also requires highly precise equipment with strict requirements for connection accuracy. If the equipment's precision is insufficient, the yield rate will be low, increasing costs. Furthermore, the bag body can only be sealed with thermoplastic materials, limiting material choices and failing to meet the needs of some users.

[0004] Therefore, vest bags in the existing technology have problems such as low connection strength and difficulty in manufacturing. Utility Model Content

[0005] The purpose of this application is to provide a vest bag and its side connection structure, which has the advantages of improving connection strength and reducing manufacturing difficulty.

[0006] This application provides a vest bag, including two front sides arranged opposite each other in the thickness direction, two side sides arranged opposite each other in the width direction, and a top opening; the bottom edges of the two front sides are fixedly connected together, and the two side edges of the two front sides in the width direction are respectively connected together by the two side sides; according to the vest bag provided by this application, at least one of the two side sides includes two side faces, and one side edge of each side face in the width direction is connected to the edge of a corresponding front side, and the other side edge forms a connecting edge extending along the height direction of the vest bag; and the two connecting edges of the same side extend in the thickness direction and overlap and are fixedly connected together in the width direction.

[0007] Using the above technical solution, this application proposes to split the single-sided connecting surface into two independent side surfaces, so that their edges form connecting edges extending along the height of the bag. This design allows the two connecting edges to overlap freely in the width direction, which not only improves the connection strength of the vest bag, but also reduces the requirements for equipment positioning accuracy and the restrictions on the selection of bag materials; furthermore, using this design, qualified vest bags can be produced without subsequent trimming processes, and the manufacturing cost can also be reduced.

[0008] According to the vest bag provided in this application, when viewed from the opening to the bottom of the bag, the middle portion of each side is recessed into the interior of the vest bag.

[0009] The above technical solution, where the middle section is concave, refers to the formation of an inward concavity in the middle area of ​​the side surface along its width, resulting in an overall sloping or curved surface structure. During manufacturing, this can be achieved by using thermoforming or die-stamping processes to create continuous concave creases on the side surface. This concave structure allows the lateral tensile force generated when the bag bears weight to be distributed and transmitted along the tangent direction of the concave surface, preventing stress concentration in the vertical direction of the connecting edges and thus reducing the risk of tearing at the connecting edges.

[0010] According to the vest bag provided in this application, the connecting edge extends through the side of the vest bag in the height direction, and the two connecting edges overlap each other and have connecting areas on opposite sides, with the connecting areas extending along the height direction of the vest bag.

[0011] Using the above technical solution, the connecting edge extends along the height of the vest bag, covering the entire side of the connecting structure longitudinally and forming a continuous contact surface in the vertical direction. The connecting area formed by the two connecting edges on opposite sides extends along the height direction. During the overlapping process, the surfaces of the two connecting areas come into contact with each other and are fixed by heat sealing or adhesive. Due to the continuous longitudinal extension of the connecting area, there is no discontinuity in the overlapping area in the height direction, thus increasing the effective contact area of ​​the connecting surfaces. This design ensures that the contact surfaces between the connecting edges are uniformly stressed in the vertical direction, avoiding stress concentration problems caused by poor local contact. At the same time, it allows for a certain range of positional deviation during overlapping, ensuring connection strength without the need for precise alignment.

[0012] According to the vest bag provided in this application, the areas where the two connecting edges overlap are located in the middle part of the corresponding side, and the connecting areas of the two connecting edges are connected to each other to form a connecting surface, which extends along the height direction and is perpendicular to the width direction.

[0013] Using the above technical solution, the connecting edge is located in the middle area of ​​the side, causing the connection position of the two side surfaces to be offset inward. When the two connecting edges are aligned along the height direction, the connecting area forms an overlapping contact in a plane perpendicular to the width direction. During the bag-making process, the vertical positioning of the connecting surface allows the equipment to perform alignment operations only along a single plane, reducing the requirements for multi-axis positioning accuracy. The joint area formed by the connecting surface creates a longitudinally continuous support structure inside the side of the bag. When the bag is subjected to lateral tensile force, the stress is evenly transferred to both side surfaces through the connecting surface, avoiding the risk of local tearing.

[0014] According to the vest bag provided in this application, on the same side, the widths of the two connecting edges are equal, and the width of the area where the two connecting edges overlap is set to 5% to 25% of the width of the same side.

[0015] Using the above technical solution, during the overlapping and fixing process, the equal-width connecting edges form a symmetrical overlapping structure, allowing stress to be evenly transferred along the connecting surface and reducing the risk of localized tearing. Simultaneously, the width ratio is limited to 10% to 30%, ensuring sufficient contact area to withstand the pulling force of the handle and the weight of the items inside the bag, while avoiding a decrease in side stiffness or material waste due to excessively wide connecting edges. This ratio range is adaptable to side materials of different thicknesses and materials. For example, when the side is made of non-woven fabric, the connecting edge width can be set to 15% of the side width to achieve heat-press bonding; when the side is made of plastic film, the connecting edge width can be set to 25% to enhance heat-sealing strength.

[0016] According to the vest bag provided in this application, the bottom edges of the two front sides are fixedly connected by the bottom surface; or, the bottom edges of the two front sides are aligned with each other and fixedly connected together.

[0017] The vest bag provided in this application also includes two handles formed at the bag opening and symmetrically arranged along the width direction of the vest bag; each handle includes two lifting arms that extend upward along the height direction of the vest bag and gradually converge, and the lifting arms have a first part connected to the front of the corresponding side and a second part connected to the side of the corresponding side; the ends of the two lifting arms away from the bag opening are fixedly connected.

[0018] By employing the above technical solution, the symmetrical distribution of the handles ensures that the lifting load is evenly distributed to both sides of the bag, preventing tilting or deformation caused by unilateral force. The upward convergence of the two lifting arms forms a stable triangular structure, dispersing the longitudinal load through material deformation during lifting, while simultaneously enhancing the bonding strength through the dual connection points between the lifting arms and the front of the bag. The fixed connection at the end of the lifting arms forms a closed loop structure, distributing stress throughout the connection area under load, avoiding the breakage risk caused by traditional single-point connections. The symmetrical convergence structure of the lifting arms allows for simultaneous fixing of multiple connection points through a one-time heat-sealing process during manufacturing, reducing the precision requirements for equipment positioning.

[0019] According to the vest bag provided in this application, a protruding tab is formed at the middle position of the bag opening in the width direction of the vest bag, and an easy-tear line is formed on the protruding tab.

[0020] According to the vest bag provided in this application, the two connecting edges are made of non-woven fabric or plastic film and are heat-sealed together; or, the two connecting edges are made of paper and are glued together.

[0021] According to the vest bag provided in this application, the sides and front are made of the same material and have an integrated structure. Attached Figure Description

[0022] Figure 1 A three-dimensional structural diagram of a three-dimensional bag from one perspective, provided in an embodiment of this application;

[0023] Figure 2 This is a side view of one side of the three-dimensional bag provided in an embodiment of this application;

[0024] Figure 3 A side view of the structure of the other side of the three-dimensional bag provided in an embodiment of this application;

[0025] Figure 4 This is a schematic diagram of the front view structure of the three-dimensional bag provided in an embodiment of this application;

[0026] Figure 5 A schematic diagram of the cross-sectional structure of the three-dimensional bag provided in the embodiment of this application in its width direction;

[0027] Figure 6 This is a three-dimensional structural diagram of the three-dimensional bag provided in an embodiment of this application from another perspective.

[0028] Explanation of reference numerals in the attached figures:

[0029] X, width direction; H, thickness direction; Z, height direction;

[0030] 10. Front;

[0031] 20. Side view; 210. Side split surface; 211. Connecting edge;

[0032] 30. Bag opening;

[0033] 40. Lifting the hand; 410. Lifting the arm; 411. Part One; 412. Part Two;

[0034] 50. Raised sheet; 510. Tear line. Detailed Implementation

[0035] In existing technologies, the side sealing of vest bags typically employs a direct butt joint method. This structure results in a limited contact area and stress concentration at the seal line, making it prone to tearing. Since sealing accuracy directly affects finished product quality, production equipment must possess extremely high positioning precision; otherwise, the defect rate will increase. Furthermore, traditional butt joint processes are only suitable for thermoplastic materials, limiting their application scenarios for non-woven fabrics, paper, and other materials. Analysis shows that a single butt joint surface cannot effectively distribute the load, and the process has low tolerance for error.

[0036] Based on this, this application proposes to split the single-sided connecting surface into two independent side surfaces, so that their edges form connecting edges extending along the height of the bag. This design allows the two connecting edges to overlap freely in the width direction, which not only improves the connection strength of the vest bag, but also reduces the requirements for equipment positioning accuracy and the restrictions on the selection of bag materials; furthermore, using this design, qualified vest bags can be produced without subsequent trimming processes, and the manufacturing cost can also be reduced.

[0037] To more clearly illustrate the vest bag provided in this application, the following description is provided in conjunction with the accompanying drawings:

[0038] Therefore, this application proposes a vest bag, please refer to... Figures 1 to 3 It includes two front faces 10 arranged opposite each other in the thickness direction H, two side faces 20 arranged opposite each other in the width direction X, and a top opening 30. The bottom edges of the two front faces 10 are fixedly connected, and the side edges are respectively connected by the side faces 20. At least one side face 20 includes two side facets 210. Specifically, one side face 20 may include two side facets 210, or both side faces 20 may include two side facets 210.

[0039] Each side surface 210 is connected to the front surface 10 on one side edge in the width direction X. For example, the side surface 210 on one side edge in the width direction X can be integrally formed with the front surface 10 or it can be separately fixedly connected to the front surface 10. The other side edge forms a connecting edge 211 extending along the height direction Z. The two connecting edges 211 on the same side surface 20 extend along the thickness direction H and overlap and are fixedly connected together in the width direction X.

[0040] The side split surface 210 refers to a structure that divides a single connecting surface into two independent units. Specifically, it can be connected to the front surface 10 using heat sealing or adhesive bonding. Its function is to form a connecting edge 211 with adjustable overlap. The connecting edge 211 is a strip-shaped area extending along the height of the bag. It can be made of materials such as non-woven fabric, plastic film, or paper, and is fixed by heat sealing or adhesive bonding. Its width is unlimited and can be set to 10%-30% of the total width of the side surface 20, for example, 10%, 15%, or 30% of the total width of the side surface 20. This can be used to increase the contact area and distribute the load. Overlapping refers to a connection method where the two connecting edges 211 partially cover and fix each other in the width direction X. Specifically, adjusting the overlap position can compensate for equipment positioning deviations and simultaneously form multiple stress transmission paths.

[0041] Specifically, after the two side facets 210 are connected to the edges of the front face 10, their connecting edges 211 extend along the height Z of the bag to the full height of the side face 20. When the two connecting edges 211 overlap in the width X direction, the contact area covers the entire height of the side face 20, avoiding the problem of local stress concentration in the butt joint method. The fixed connection of the overlapping area forms a continuous load-bearing surface, and external forces can be transmitted to the front face 10 through the two side facets 210, significantly improving tear resistance. During the production process, operators do not need to precisely align the edges of the connecting edges 211; they only need to ensure a certain amount of overlap to complete a reliable seal, thereby reducing equipment precision requirements and improving yield. In addition, this structure supports various connection methods such as heat sealing and adhesive bonding, enabling the application of non-thermoplastic materials such as paper and non-woven fabrics.

[0042] Compared with existing technologies, the vest bag provided in this application forms a linear connection on a single plane through butt joint sealing, while this solution constructs a surface contact structure through overlapping. In existing technologies, connection errors directly affect the sealing strength, while this solution allows the overlap amount to fluctuate within a certain range, significantly improving process stability. Regarding material applicability, traditional processes are limited to thermoplastic plastics, while this solution achieves multi-material compatibility because the connecting edge 211 can independently select the material and connection method.

[0043] Through the above technical solution, this application solves the problems of low connection strength and manufacturing difficulty of the side 20. The overlapping structure disperses stress by increasing the contact area, effectively preventing the bag from cracking from the side 20 under full load. The positional tolerance design of the connecting edge 211 reduces the dependence on the precision of production equipment and reduces defects caused by positioning deviations. In addition, this structure overcomes material limitations, allowing the vest bag to be made of environmentally friendly paper or non-woven fabric materials to meet diverse usage needs.

[0044] Furthermore, in the vest bag provided in this application, please see Figure 5 Looking from the bag opening 30 towards the bottom of the bag, the middle part of each side 20 is recessed towards the inside of the vest bag.

[0045] The inward concavity in the middle refers to the inward concavity formed in the middle region of the side 20 in the width direction X, making the side 20 as a whole a sloping or curved structure. During manufacturing, this can be achieved by using thermoforming or die stamping processes to create continuous concave creases on the side 20. The concave structure allows the lateral tensile force generated when the bag bears weight to be distributed and transmitted along the tangent direction of the concave surface, avoiding stress concentration in the vertical direction of the connecting edge 211, thereby reducing the risk of tearing of the connecting edge 211.

[0046] Furthermore, in the vest bag provided in this application, the connecting edge 211 extends through the side 20 in the height direction Z of the vest bag, and a connecting area is formed where the two connecting edges 211 overlap, and the connecting area extends along the height direction Z of the vest bag.

[0047] Wherein, the connection edge 211 extending through the side surface 20 in the height direction Z means that the longitudinal extension range of the connection edge 211 covers the entire height of the side surface 20. Specifically, it can be achieved by heat sealing or adhesive bonding process, so as to ensure the longitudinal continuity of the connection structure.

[0048] The connection area formed on the opposite sides refers to the area where the two connecting edges 211 contact each other when they overlap. Specifically, it can be achieved by covering the surface of the connecting edges 211 with thermoplastic material or adhesive. This area extends along the height direction Z to form a linear contact surface, thereby increasing the effective contact length of the connecting surface.

[0049] Specifically, the connecting edge 211 extends along the height direction Z of the vest bag through the side 20, so that the longitudinal extension of the connecting structure covers the entire side 20, forming a continuous contact surface in the vertical direction. The connecting area formed by the two connecting edges 211 on opposite sides extends along the height direction Z. During the overlapping process, the surfaces of the two connecting areas come into contact with each other and are fixed by heat sealing or adhesive. Due to the continuous longitudinal extension of the connecting area, there is no discontinuity in the overlapping area in the height direction Z, which increases the effective contact area of ​​the connecting surface. This design ensures that the contact surface between the connecting edges 211 is uniformly stressed in the vertical direction, avoiding stress concentration problems caused by poor local contact, while allowing a certain range of positional deviation during overlapping, ensuring connection strength without the need for precise alignment.

[0050] Compared to existing technologies, traditional vest bags use a butt-fitting sealing method on the side 20, with the contact area limited to the thickness direction H of a single layer of material. This results in low connection strength and high precision requirements for equipment. This application expands the contact surface into a linear region along the height direction Z by using a connecting edge 211 that extends through the entire length and a connecting area, thereby increasing the contact area for the overlapping seal. The overlapping method allows for positional deviations of the connecting edge 211 in the width direction X or the thickness direction H, achieving an effective connection without precise alignment and reducing reliance on the precision of production equipment.

[0051] Through the above technical solution, this application achieves an increase in the contact area and enhanced lap joint tolerance of the side 20-section connection structure. The connection strength is transformed from the single-point contact of traditional butt-joint sealing to linear contact, improving tear and tensile strength. A certain range of positional deviation is allowed during the lap joint process, reducing the precision requirements of production equipment and increasing the yield rate. Furthermore, the connection area is compatible with various processes such as heat sealing and adhesive bonding, broadening the range of material choices.

[0052] Furthermore, in the vest bag provided in this application, the areas where the two connecting edges 211 overlap are located in the middle part of the corresponding side 20, and the connecting areas of the two connecting edges 211 are connected to each other to form a connecting surface. The connecting surface extends along the height direction Z and is perpendicular to the width direction X. That is to say, the connecting surface is located perpendicular to the front 10 of the vest bag.

[0053] The middle portion refers to the area of ​​the side surface 20 located between the two dividing surfaces 210 in the width direction X. This can be achieved by setting the connecting edge 211 at a distance proportional to the width of the side surface; for example, the width of this area can range from 30% to 50% of the total width of the side surface 20. The connecting area refers to the adhesive or heat-sealed area that extends continuously in the height direction Z of the connecting edge 211. This can be achieved by coating with thermoplastic materials or covering with adhesives. The connecting surface refers to the continuous interface formed by hot pressing or adhesive bonding between the two connecting areas. This can be achieved by applying specific temperature and pressure using a heat sealer or by applying adhesive and then curing.

[0054] It should be understood that this application only exemplarily describes some implementations of the connecting edge 211. In other implementations, the area where the two connecting edges 211 overlap can also be located at other positions of the corresponding side 20. For example, the area where the two connecting edges 211 overlap can be located at the position where the side 20 is connected to the front 10, or it can be located in the area between the position where the side 20 is connected to the front 10 and the center line of the side 20.

[0055] Specifically, the connecting edge 211 is located in the middle region of the side surface 20, causing the connection position of the two side surfaces 210 to be offset inward. When the two connecting edges 211 are aligned along the height direction Z, the connecting area forms an overlapping contact in a plane perpendicular to the width direction X. During the bag making process, the vertical positioning of the connecting surface allows the equipment to perform alignment operations only along a single plane, reducing the requirements for multi-axis positioning accuracy. The joint area formed by the connecting surface forms a longitudinally continuous support structure inside the bag side surface 20. When the bag is subjected to lateral tensile force, the stress is evenly transmitted to the two side surfaces 210 through the connecting surface, avoiding the risk of local tearing.

[0056] Compared to existing technologies, traditional vest bags have the side connection point 20 directly joined at the side edge, with the joint surface parallel to the width direction X of the bag, resulting in the joint surface bearing shear force under stress. This solution adjusts the joint surface to be perpendicular to the width direction X, allowing the joint surface to primarily bear positive pressure, thus improving tensile strength. Existing technologies require high-precision joining at the side edge, while this solution allows for a certain range of positional tolerance at the middle connection edge 211, reducing equipment precision requirements. Furthermore, the vertical plane connection structure allows heat sealing or adhesive bonding operations to be completed on a single plane, eliminating the need to adjust multi-angle sealing parameters and simplifying the production process.

[0057] Through the above technical solution, this application effectively enhances the structural stability of the side 20 connection and reduces the dependence on equipment positioning accuracy during bag making. Furthermore, the vertical layout of the connection surface ensures a more uniform stress distribution on the bag body under load, preventing cracking at the connection point. The design of the connection edge 211 in the middle position allows for the combination of side surfaces 210 with different thicknesses or materials; for example, a reinforcing layer can be set in the middle area or different materials can be selected, expanding the range of bag body materials available.

[0058] Furthermore, in the vest bag provided in this application, on the same side 20, the two connecting edges 211 are of equal width, and the width of the area where the two connecting edges 211 overlap is set to 5% to 25% of the width of the same side 20.

[0059] The equal width of the connecting edges 211 refers to the fact that the edges of the two side facets 210 have an overlapping area of ​​the same size in the width direction X. This can be achieved by using an equal-width cutting process, such as by synchronously controlling the cutting dimensions of the edges of the two side facets 210 through a mold or cutting equipment. This design ensures that the overlapping areas of the two side facets 210 are symmetrically distributed, avoiding overlap offset due to width differences.

[0060] The width ratio range refers to the proportion of the connecting edge 211 within the overall width of the side surface 20. Specifically, the relative ratio between the connecting edge 211 and the side surface 20 can be controlled by adjusting the cutting parameters. This ratio range is determined based on a balance between mechanical load-bearing requirements and material utilization. For example, a narrower width is suitable for thin and light materials, while a wider width is suitable for high-load scenarios.

[0061] Specifically, during the overlapping and fixing process, the equal-width connecting edges 211 form a symmetrical overlapping structure, allowing stress to be evenly distributed along the connecting surface and reducing the risk of localized tearing. Simultaneously, the width ratio is limited to 5% to 25%, ensuring sufficient contact area to withstand the pulling force of the handle 40 and the weight of the items inside the bag, while avoiding a decrease in the stiffness of the side 20 or material waste due to excessively wide connecting edges 211. This ratio range is adaptable to side 20 materials of different thicknesses and materials. For example, when the side 20 is made of non-woven fabric, the width of the connecting edge 211 can be set to 10% of the width of the side 20 to achieve heat-press bonding; when the side 20 is made of plastic film, the width of the connecting edge 211 can be set to 25% to enhance heat-sealing strength.

[0062] Through the above technical solution, this application solves the stress concentration problem caused by uneven width of the connecting edge 211, improves the tear resistance of the bag side 20 connection, reduces the requirements for cutting and alignment accuracy in the production process, and enables stable production with conventional equipment. At the same time, by optimizing the width ratio of the connecting edge 211, the bag can be adapted to various materials such as non-woven fabric, plastic film and paper, meeting the needs of different users for environmental protection, cost and strength.

[0063] Furthermore, in the vest bag provided in this application, the bottom edges of the two front faces 10 are fixedly connected by the bottom surface.

[0064] The bottom surface fixed connection refers to sealing the bottom edges of the two front surfaces 10 using a sheet-like structure independent of the front surfaces 10. This can be achieved through heat sealing, adhesive bonding, or stitching. The bottom surface covers the bottom edges of the two front surfaces 10 to form a surface contact connection. This structure increases the area of ​​the connection region, disperses the stress on the bottom, and avoids stress concentration caused by traditional linear sealing.

[0065] Specifically, the bottom surface, as an independent structure, covers the bottom edges of the two front surfaces 10, overlapping to form a multi-layered composite structure. The connection between the bottom surface and the front surfaces 10 employs surface contact sealing, transforming the bottom sealing area from a traditional single-layer linear connection to a multi-layered planar connection. Because the overlapping area of ​​the bottom and front surface materials forms a continuous planar seal, the load can be evenly distributed across the entire bottom surface area under stress, avoiding the risk of tearing due to excessive localized stress. Furthermore, the introduction of the bottom surface structure allows for the use of different material combinations, such as a composite of non-woven fabric and plastic film, or a combination of paper materials and adhesives, thus overcoming the limitations of traditional single-material heat sealing.

[0066] Furthermore, in the vest bag provided in this application, the bottom edges of the two front sides 10 can also be aligned with each other and fixedly connected together, for example, by heat sealing.

[0067] Further, please see Figure 1, Figure 4 and Figure 6 In the vest bag provided in this application, two handles 40 are provided at the bag opening 30, which are symmetrically distributed along the width direction X of the vest bag. Each handle 40 includes two lifting arms 410 that extend upward along the height direction Z of the bag and gradually converge. Each lifting arm 410 has a first part 411 connected to the front 10 of the corresponding side and a second part 412 connected to the side 20 of the corresponding side. The ends of the two lifting arms 410 away from the bag opening 30 are fixedly connected.

[0068] Among them, the symmetrically set handles 40 refer to the two handles 40 being mirror-symmetrically distributed in the width direction X of the bag. Specifically, the handles 40 can be symmetrically fixed by heat sealing or adhesive bonding to balance the load distribution when lifting.

[0069] Among them, the gradually narrowing handle 410 refers to the handle 40 extending upward from the bag opening 30, with its width gradually decreasing. Specifically, it can adopt a trapezoidal or triangular structure design to form a stable support shape.

[0070] Among them, the distal end of the fixedly connected lifting arm 410 refers to the closed structure formed by heat sealing, gluing or sewing of the ends of the two lifting arms 410 to eliminate stress concentration caused by free movement of the ends.

[0071] Specifically, the symmetrical distribution of the handles 40 ensures that the lifting load is evenly distributed to both sides of the bag, preventing tilting or deformation caused by unilateral force. The upward convergence of the two lifting arms 410 forms a stable triangular structure, dispersing the longitudinal load through material deformation during lifting, while enhancing the bonding strength through the dual connection points between the lifting arms 410 and the front of the bag 10. The fixed connection at the end of the lifting arms 410 forms a closed loop structure, distributing stress throughout the connection area under load, avoiding the breakage risk caused by traditional single-point connections. The symmetrical convergence structure of the lifting arms 410 allows for simultaneous fixation of multiple connection points through a one-time heat-sealing process during manufacturing, reducing the equipment's positioning accuracy requirements.

[0072] Through the above technical solution, this application solves the problems of low connection strength and complex manufacturing process of traditional vest bag handles 40. By using symmetrical handles 40 and closed connection structure, the load-bearing capacity of handles 40 is enhanced, the impact of positioning error in the processing is reduced, the yield is improved, and the applicable range of bag materials is expanded.

[0073] Further, please see Figure 4 and Figure 6 In the vest bag provided in this application, a protruding tab 50 is formed at the middle position of the bag opening in the width direction of the vest bag, protruding from the front 10, and an easy-tear line 510 is formed on the protruding tab 50.

[0074] Specifically, the tab 50 can be integrally formed with the front 10, and the tear line 510 can be embossed on the tab 50. This is used to make it easier to tear the two bags.

[0075] Furthermore, in the vest bag provided in this application, the two connecting edges 211 are made of non-woven fabric or plastic film and heat-sealed together, or the two connecting edges 211 are made of paper and glued together.

[0076] Among them, the connecting edge 211 made of non-woven fabric or plastic film refers to a flexible sheet structure made of thermoplastic materials such as polypropylene or polyethylene, which can be produced by melt-blowing or casting processes, and its surface has fusible properties. The connecting edge 211 made of paper refers to a rigid sheet structure made of cellulose fibers, which can be formed by cutting kraft paper or cardboard, and its surface has porous adsorption properties. Heat sealing connection refers to the process of melting and fusing the material surface through heating and pressure, which can be achieved by using hot press rollers or ultrasonic welding equipment. Adhesive bonding refers to the process of forming intermolecular bonding forces on the material surface through adhesives, which can be achieved by water-based adhesives or hot melt adhesive coating processes.

[0077] Specifically, when the connecting edge 211 is made of non-woven fabric or plastic film, the heat-sealing process utilizes the melting properties of the material to form a continuous molten layer in the overlapping area, fusing the materials on both sides into a single structure. This covers the gap in the overlapping area without requiring precise alignment. When the connecting edge 211 is made of paper, the adhesive process penetrates the fiber pores to form a three-dimensional mesh adhesive layer in the overlapping area, maintaining an effective bonding area even with minor misalignments. Both connection methods select the appropriate fixing process based on the material properties, forming a continuous bonding interface on the overlapping surface and reducing the sensitivity to equipment positioning accuracy.

[0078] In some specific embodiments, the nonwoven fabric connecting edge 211 can be selected with a basis weight of 15-30 g / m. 2 The spunbond nonwoven fabric has a heat-sealing temperature controlled within the range of 120-150℃. The paper sheet connecting edge 211 can be selected with a basis weight of 80-120 g / m². 2 For kraft paper, the adhesive can be an aqueous solution of sodium carboxymethyl cellulose, with a coating weight of 5-8 g / m². 2 .

[0079] Compared to existing technologies, traditional methods can only use thermoplastic materials and connect them through heat sealing, excluding paper materials from the application range because they cannot be melted. This solution introduces an adhesive bonding process, allowing paper materials to be used as connecting edges 211, while retaining the heat sealing connection methods for non-woven fabrics and plastic films, thus expanding the range of material choices. Regarding processing precision, traditional heat sealing requires precise alignment to avoid misalignment of the molten zone, while this solution allows for a certain amount of misalignment at the overlapping surfaces, reducing the precision requirements of the equipment positioning system.

[0080] Through the above technical solution, this application achieves reliable fixing of connecting edges 211 made of different materials, making the connecting structure of the vest bag side 20 compatible with non-woven fabric, plastic film and paper materials, thus solving the problem of limited material selection. At the same time, through the adaptability design of heat sealing and adhesive bonding processes, the dependence on equipment positioning accuracy during processing is reduced, the finished product qualification rate is improved and the production process is simplified.

[0081] Furthermore, in the vest bag provided in this application, the side 20 and the front 10 can be made of the same material and are set as an integral structure.

[0082] The sides 20 and the front 10 can be made of one of the following materials: non-woven fabric, plastic film, or paper. The integrated structure means that the sides 20 and the front 10 are continuously formed from the same material, without subsequent splicing or sealing. This can be achieved using blow molding or thermoforming processes. Through mold design, the material naturally forms continuous front 10 and side 20 sections during the molding process. The connection area between the sides 20 and the front 10 is directly formed seamlessly through the integrated molding process, avoiding the weak points caused by splicing in a separate structure.

[0083] Specifically, the side panel 20 and the front panel 10 are manufactured as a single piece using a molding process. Within the mold, material flow forms a continuous bag structure, and the edges of the front panel 10 and side panel 20 are directly fused together seamlessly. Since there is no need to separately seal the side panel 20 and front panel 10, the high-precision alignment and heat-sealing steps of traditional processes are eliminated during production, reducing the risk of connection failure due to equipment errors. Furthermore, the one-piece structure allows the use of non-thermoplastic materials, such as pulp processed through compression molding or biodegradable composite materials, overcoming the material limitations of traditional heat-sealing processes.

[0084] Through the above technical solution, this application solves the problems of low connection strength, complex manufacturing process and limited materials on the side of traditional vest bags. By seamless one-piece molding, the structural stability is enhanced, the production process is simplified, the equipment requirements are reduced, and the application of a variety of environmentally friendly materials is supported, ultimately improving the yield and reducing the production cost.

[0085] The above description illustrates the implementation of this application through specific embodiments. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application is presented in conjunction with preferred embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. To provide a thorough understanding of this application, many specific details are included in the above description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0086] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0087] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0088] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0089] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

Claims

1. A vest bag, characterized in that, It includes two front sides arranged opposite each other in the thickness direction, two side sides arranged opposite each other in the width direction, and a top opening; wherein, The bottom edges of the two front surfaces are fixedly connected together, and the two side edges of the two front surfaces in the width direction are respectively connected together by the two side surfaces; At least one of the two sides includes two side facets, each side facet having one edge connected to the edge of a corresponding front facet in the width direction, and the other edge forming a connecting edge extending along the height direction of the vest bag; and... The two connecting edges on the same side extend along the thickness direction and overlap and are fixed together in the width direction.

2. The vest bag as described in claim 1, characterized in that, Looking from the opening of the bag to the bottom, the middle portion of each of the sides is recessed into the interior of the vest bag.

3. The vest bag as described in claim 2, characterized in that, The connecting edge extends through the side of the vest bag in the height direction, and a connecting area is formed where the two connecting edges overlap, the connecting area extending along the height direction of the vest bag.

4. The vest bag as described in claim 3, characterized in that, The areas where the two connecting edges overlap are located in the middle of the corresponding side, and the connecting areas of the two connecting edges are connected to each other to form a connecting surface, which extends along the height direction and is perpendicular to the width direction.

5. The vest bag as described in any one of claims 1 to 4, characterized in that, In the same side, the width of the area where the two connecting edges are of equal width and the two connecting edges overlap is 5% to 25% of the width of the side.

6. The vest bag as described in any one of claims 1 to 4, characterized in that, The bottom edges of the two front surfaces are fixedly connected by the bottom surface; or The bottom edges of the two front surfaces are aligned with each other and fixedly connected together.

7. The vest bag as described in any one of claims 1 to 4, characterized in that, It also includes two handles formed at the bag opening and symmetrically arranged along the width direction of the vest bag; wherein, Each handle includes two lifting arms that extend upwards along the height of the vest bag and gradually taper, and each lifting arm has a first portion connected to the front of the corresponding side and a second portion connected to the side of the corresponding side; and The two lifting arms are fixedly connected at the ends away from the bag opening.

8. The vest bag as described in any one of claims 1 to 4, characterized in that, The opening of the bag has a protruding tab at the middle position in the width direction of the vest bag, and the protruding tab has an easy-tear line.

9. The vest bag as described in any one of claims 1 to 4, characterized in that, The two connecting edges are made of non-woven fabric or plastic film, and the two connecting edges are heat-sealed together; or... The two connecting edges are made of paper, and the two connecting edges are glued together.

10. The vest bag as described in claim 9, characterized in that, The side and the front are made of the same material and are an integral structure.

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