Packaging bag bottom sealing device, manufacturing equipment, manufacturing method and packaging bag

Abstract

The invention discloses a packaging bag bottom sealing device, manufacturing equipment, a manufacturing method and a packaging bag, the bottom sealing device is used for sealing the bottom of a cylindrical bag body unit to form the bottom wall of the packaging bag, and the bottom sealing device comprises a rack, a first bottom sealing mechanism and a second bottom sealing mechanism; the first bottom sealing mechanism is arranged on the rack and used for sealing a first bottom sub-surface to the bottom surface, and the first bottom sub-surface is a bottom sub-surface, closer to the middle supporting part, in the bottom wall; the second bottom sealing mechanism is arranged on the rack, located on the downstream side of the first bottom sealing structure in the production direction of the packaging bag and used for sealing a second bottom sub-surface to the bottom surface, and the end of the second bottom sub-surface is fixed to the end of the first bottom sub-surface in an overlapped mode; the second bottom sealing mechanism does not generate indentations or other traces on the positions, corresponding to the second bottom sub-surfaces, of the side walls of the bag body units in the sealing process; and when the packaging bag is applied to manufacturing equipment, the finally produced packaging bag can be better in aesthetic property.

Description

Technical Field

[0001] The present application relates to the technical field of packaging bag making, and in particular to a bottom sealing device used in packaging bag making equipment, and a method for making packaging bags. Background Art

[0002] Packaging bags are bags used to package items and are widely used in daily life and industrial production. Common packaging bags are made from a variety of materials, including polyethylene, polypropylene, polyvinyl chloride, and paper. The shapes of the bags are also diverse according to different usage requirements. For example, paper packaging bags made through a continuous production process using roll paper as the raw material, during the processing, a single roll of paper is first formed into a continuous cylindrical structure, which is then cut into individual bag units. The bottom wall of each bag unit is then folded to one side to form a flat shape. At this point, the bottom wall of the bag unit is in an open state. The side edges on both sides of the bottom wall are then bent toward the bottom wall and sealed, thus processing a complete packaging bag.

[0003] During the bottom wall sealing process of packaging bags, the prior art typically utilizes continuous production equipment. To smoothly bend the sides of the bottom wall along a predetermined bend line, the production equipment typically includes two folding knives and slots on a conveying platform (e.g., a drum mechanism). The two folding knives insert the bent portions of the bottom wall's two sides into the corresponding slots, causing the two sides of the bottom wall to tilt upward. The two sides of the bottom wall are then bent and sealed using corresponding guiding and sealing structures. During this process, when the folding knives insert into the side edge where the bottom wall overlaps with the bag unit, they leave a mark on the side wall of the bag unit. This mark cannot be eliminated after the bag is manufactured, significantly affecting the overall aesthetics of the packaging bag.

[0004] Therefore, the packaging bag making equipment in the prior art has the problem of poor aesthetics when making packaging bags. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem of poor aesthetics when packaging bags are made by packaging bag making equipment in the prior art.

[0006] To achieve the above-mentioned purpose, the present application provides a bottom sealing device for a packaging bag, which seals the bottom of a cylindrical bag unit to form the bottom wall of the packaging bag, wherein the bottom wall of the packaging bag includes a middle support portion, a first bottom surface and a second bottom surface located on both sides of the middle support portion along the thickness direction of the packaging bag; the middle support portion is bent inwardly relative to the side wall of the packaging bag, and the first bottom surface and the second bottom surface are respectively bent toward the middle support portion and fixed to the corresponding surface of the middle support portion, and the opposite ends of the first bottom surface and the second bottom surface are overlapped and fixed to each other; the bottom sealing device includes a frame, a first bottom sealing mechanism and a second bottom sealing mechanism; the first bottom sealing mechanism is arranged on the frame, and is used to seal the first bottom surface to the bottom surface, and the first bottom surface is the part of the bottom wall that is closer to the middle support portion. the bottom surface of the support portion; the second bottom sealing mechanism is arranged on the frame and is located on the downstream side of the first bottom sealing structure along the production direction of the packaging bag, and is used to seal the second bottom surface to the bottom surface, and the end of the second bottom surface is overlapped and fixed to the end of the first bottom surface; the second bottom sealing mechanism includes a limiting component arranged on the frame and a guiding sealing component arranged on one side of the limiting component, and the limiting component has an abutting surface extending along the production direction; and when the bag body unit passes through the second bottom sealing mechanism, the abutting surface is pressed on the middle support portion of the bag body unit, and one side edge is aligned with the bending line of the second bottom surface relative to the middle support portion, and the guiding sealing component guides the second bottom surface to bend relative to the middle support portion and is overlapped and fixed to the middle support portion and the first bottom surface.

[0007] By adopting the above technical solution, the bottom sealing device provided by the present application includes a first bottom sealing mechanism and a second bottom sealing mechanism, and the first bottom sealing mechanism and the second bottom sealing mechanism are sequentially arranged as two independent bottom sealing structures along the production direction; in this way, when the bag unit passes through the workstations where the first bottom sealing mechanism and the second bottom sealing mechanism are located in sequence, the first bottom sealing mechanism and the second bottom sealing mechanism can act independently to seal the first bottom surface and the second bottom surface respectively, and the two sealing actions will not interfere with each other; for example, when the first bottom sealing mechanism seals the first bottom surface, since the first bottom surface is the bottom surface in the bottom wall that is closer to the middle support portion, when the bag bottom is in the open state, the first bottom surface is not attached to the side wall of the bag unit, and the first bottom sealing mechanism adopts a simple method based on the characteristics of the first bottom surface. The structure can realize the sealing of the first bottom surface; when the second bottom sealing mechanism seals the second bottom surface, since the second bottom surface is attached to the side wall of the bag unit when it is not sealed, the second bottom sealing mechanism in the present application includes a limiting component arranged on the frame, and a guiding sealing component arranged on one side of the limiting component, and the limiting component has an abutting surface extending along the production direction; when the bag unit passes through the second bottom sealing mechanism, the abutting surface presses on the middle support portion of the bag unit, and one side edge is aligned with the bending line of the second bottom surface relative to the middle support portion; in the process of the bag unit gradually moving along the production direction, the guiding sealing component will guide the second bottom surface to bend relative to the middle support portion and overlap and fix it on the middle support portion and the first bottom surface. During the whole process, the various structures in the second bottom sealing mechanism will not produce indentations or other marks on the corresponding positions of the second bottom surface on the side wall of the bag unit, so that the final packaging bag has a better appearance.

[0008] In addition, since the first bottom sealing mechanism and the second bottom sealing mechanism are independently arranged in the bottom sealing device provided by the present application, the sealing action will not affect the transportation of the bag unit, and the packaging bag does not need to stop between the two sealing stations, which can ensure the continuous processing of the bag unit.

[0009] In addition, the first bottom sealing mechanism and the second bottom sealing mechanism in the bottom sealing device provided by the present application can be independently designed based on the corresponding posture characteristics of the first bottom surface and the second bottom surface. When applied to various packaging bag production equipment, there is no need to make major matching improvements to other structures to achieve overall coordination between the bottom sealing device and the production equipment, which has the advantage of good applicability.

[0010] Therefore, when the bottom sealing device provided in this application is applied to packaging bag production equipment, it can not only produce more beautiful packaging bags while ensuring the production efficiency of the production equipment, but also is easier to adapt to other structures of the production equipment, especially when modifying old models of equipment, it is easier and the modification cost is lower.

[0011] According to the bottom sealing device of the packaging bag provided in the present application, the bottom sealing device also includes a bag conveying device, which is arranged on the frame and extends from the entrance of the first bottom sealing mechanism to the exit of the second bottom sealing mechanism; the bag conveying device includes a first conveying part extending through the first bottom sealing mechanism, a second conveying part extending through the second bottom sealing mechanism, and a reversing mechanism arranged between the first conveying part and the second conveying part; the first conveying part conveys the bag unit through the first bottom sealing mechanism along the production direction in a posture in which the length direction of the bag unit coincides with the production direction, the reversing mechanism changes the posture of the bag unit from the first conveying part into a posture in which the length direction of the bag unit is perpendicular to the production direction and conveys the bag unit to the second conveying part, the second conveying part receives the reversed bag unit and conveys the bag unit through the second bottom sealing mechanism along the production direction.

[0012] By adopting the above technical solution, the present application sets a reversing mechanism between the first conveying part and the second conveying part. The reversing mechanism can reverse the bag unit after the first bottom sealing mechanism seals the first bottom surface, so that when the bag unit is sealed at the two bottom sealing stations, it can switch to different postures based on the corresponding structures of the first bottom sealing mechanism and the second bottom sealing mechanism and the bottom sealing action. For example, the first bottom sealing mechanism adopts a combination of a simple structure of a folding knife and a pressing wheel to achieve the sealing of the first bottom surface, and the first bottom surface is close to the bottom position of the bag unit. After the bag unit is cut and the bottom is opened, The sealing action of the first bottom surface is performed directly on the downstream side of the bag unit conveying direction, which is not only efficient but also conducive to the structural design of the first bottom sealing mechanism. When the second bottom surface is not sealed, it is attached to the side wall of the bag unit. The present application can use the reversing mechanism to allow the bag unit to be conveyed along the vertical production direction, so that the folding action of the second bottom surface is perpendicular to the conveying direction. In this way, the second bottom sealing mechanism is set on one side of the bag unit conveying path to achieve the sealing action of the second bottom surface, and the folding action of the second bottom surface by the second bottom sealing mechanism will not affect the normal conveying of the bag unit. Using such a structure, not only can the continuous production of packaging bags be ensured, but also the spatial layout of the first and second bottom sealing mechanisms can be more flexible.

[0013] According to the bottom sealing device of the packaging bag provided in the present application, the limiting component includes a limiting plate extending along the production direction, and one side of the limiting plate has an abutment surface extending along the horizontal direction; the guiding sealing component includes a folding component and a sealing component; wherein the folding component is arranged on the other side of the limiting plate relative to the bending line perpendicular to the production direction, and bends the second bottom surface along the bending line, and the sealing component fixes and seals the second bottom surface to the bottom surface.

[0014] With the above technical solution, the abutting surface of the limiting plate extends in the horizontal direction, continuously pressing the middle support portion during the movement of the bag body, and one side edge is aligned with the bending line of the second bottom face relative to the middle support portion, so that the second bottom face can be bent according to a predetermined position and angle during the bending process. Moreover, the abutting surface can continuously press the middle support portion during the movement of the bag unit, so that the second bottom face is not prone to shaking or shifting during the bending process. The folding component in the guiding sealing assembly is arranged on the other side of the limiting plate relative to the bending line perpendicular to the production direction, and can guide the second bottom face to bend along the bending line during the conveyance of the bag unit. As a result, during the operation of the entire second bottom sealing mechanism, each structure will not produce indentations or other marks on the corresponding positions of the second bottom face on the side wall of the bag unit.

[0015] According to the bottom sealing device of the packaging bag provided in the present application, the folding component is configured as a guide plate extending along the production direction, the guide plate has a guide surface extending in a curved surface relative to the horizontal direction, and the angle between the guide surface and the conveying plane of the second conveying part gradually decreases along the production direction; the sealing component is configured as a sealing pressure wheel.

[0016] Using the above technical solution, the guide plate has a guide surface extending in a curved shape relative to the horizontal direction. The curved surface design can provide a continuous and smooth guide for the second bottom surface. During the movement of the bag unit along the production direction, the second bottom surface will naturally change direction gradually along the shape of the curved guide surface to achieve bending.

[0017] In addition, the angle between the guide surface and the conveying plane of the second conveying section gradually decreases along the production direction, resulting in a relatively gentle guiding force on the second bottom facet when it begins to bend. This prevents excessive stress concentration caused by sudden angle changes, which could lead to wrinkles or damage on the second bottom facet. As the bag unit moves, the angle gradually decreases and the guiding force gradually increases, effectively pushing the second bottom facet to complete the bending action and making the bending process more stable. Furthermore, the curved guide surface is relatively smooth, reducing frictional resistance between the second bottom facet and the guide plate during the folding process. Compared to guide structures with right angles or sharp edges, the curved design prevents the second bottom facet from being scratched or stuck during bending, allowing the second bottom facet to bend more smoothly along the guide surface. By configuring the sealing component as a sealing pressure wheel, the sealing pressure wheel and the second bottom facet are in rolling contact. The sealing pressure wheel can apply uniform pressure to the second bottom facet during rotation, resulting in a better sealing effect on the second bottom facet.

[0018] According to the bottom sealing device of the packaging bag provided in the present application, the second bottom sealing mechanism also includes a glue spraying component and a blowing component; the glue spraying component, the blowing component, the folding component and the sealing component are arranged on the frame in sequence along the production direction; the glue spraying component is arranged at a position corresponding to the inner surface of the second bottom dividing surface, and glue is sprayed on the overlapping and fixed part of the second bottom dividing surface, the middle supporting part and the first bottom dividing surface; the blowing component is arranged on one side of the second bottom dividing surface, and blows air toward the corresponding surface of the second bottom dividing surface, so that the second bottom dividing surface enters the folding component smoothly.

[0019] By adopting the above technical solution, a glue spraying component is set up, which will spray glue onto the inner surface of the second bottom surface when working. This spraying method will make the glue more evenly coated on the inner surface of the second bottom surface, which is conducive to better subsequent bonding effect of the second bottom surface.

[0020] In addition, after the second bottom surface is coated with glue, even if it is tightly attached to the surface of the second conveying part due to factors such as increased weight, the present application provides a blowing component before the folding component. The airflow blown by the blowing component can not only separate the second bottom surface from the surface of the second conveying part, but also make the second bottom surface open to a certain angle before being folded by the folding component, thereby ensuring the stability of the second bottom surface in smooth bending.

[0021] According to the bottom sealing device of the packaging bag provided in the present application, the bag conveying device also includes an alignment adjustment mechanism arranged on the frame and located between the reversing mechanism and the limit assembly. The alignment adjustment mechanism drives the bag unit that has been reversed by the reversing mechanism to move in a direction perpendicular to the production direction so that the bending line of the second bottom dividing surface is aligned with the side edge of the abutting surface.

[0022] By adopting the above technical solution, after the bag unit rotates in the direction, even if there is a deviation between the conveying path of the bag unit and the second conveying part, the present application sets an alignment adjustment mechanism between the reversing mechanism and the limit assembly. The alignment adjustment mechanism can adjust the position of the bag unit perpendicular to the production direction and align the bending line of the second bottom surface with the side edge of the abutment surface, thereby ensuring the success rate of sealing the second bottom surface and improving the aesthetics of the sealing.

[0023] According to the bottom sealing device of the packaging bag provided in the present application, the first conveying part and the second conveying part both include a conveyor belt extending along the production direction, and at least the conveyor belt of the second conveying part has a gap extending along the production direction, and the alignment adjustment mechanism includes a limit baffle, an adjusting wheel and a pressing limit component; the limit baffle extends along the production direction and is adjustable in position on the frame, located on the side corresponding to the bottom wall of the packaging bag; the adjusting wheel is rotatably arranged on the frame around the production direction, and at least partially protrudes from the gap of the second conveying part in the vertical direction; the pressing limit component is liftably connected to the frame and is located above the adjusting wheel.

[0024] With the above technical solution, the limit baffle extends along the production direction and is adjustable in position on the frame, located on the side corresponding to the bottom wall of the packaging bag. During the alignment of the bag unit, the limit baffle can serve as a fixed reference boundary to limit the bottom of the bag unit. The adjusting wheel is rotatably arranged on the frame around the production direction, and at least partially protrudes from the gap of the second conveying part in the vertical direction. When the bag unit is conveyed to the position of the adjusting wheel, the rotation of the adjusting wheel can generate a lateral thrust on the bag unit, thereby adjusting the position of the bag unit. At the same time, the pressing limit component is liftably connected to the frame and is located above the adjusting wheel, which can press the bag unit downward so that the bag unit maintains a stable posture while being pushed by the adjusting wheel, thereby preventing the bag unit from tilting or shaking during the position adjustment process.

[0025] According to the bottom sealing device of the packaging bag provided in the present application, the reversing mechanism includes a corner blocking member, which is arranged at the entrance of the second conveying part and corresponds to the corner of the bottom wall of the packaging bag close to the limiting component; the corner of the bottom wall of the bag body unit passing from the first conveying part to the entrance of the second conveying part close to the limiting component abuts against the corner blocking member, and the bag body unit rotates around the corner blocking member to change to a posture perpendicular to the production direction.

[0026] With this technical solution, when the corner of the bottom wall of the bag unit near the stop assembly, passing from the first conveying section to the entrance of the second conveying section, abuts against the corner blocking member, the bag unit contacts the blocking member and rotates around it to complete the reversal. This entire process does not require complex mechanical movements or lengthy adjustments. Furthermore, this reversal action can match the continuous conveying speed of the conveyor belt, eliminating any interruptions or pauses in conveyance due to the reversal process. This ensures continuous and smooth production and improves production efficiency.

[0027] According to the bottom sealing device of the packaging bag provided in the present application, the corner blocking member is configured as an inverted conical blocking rod; and the reversing mechanism also includes a transfer component, which is movably arranged on the frame, located on one side of the corner blocking member, and closer to the middle position of the entrance of the second conveying part in the direction perpendicular to the production direction; when the corner of one side of the bottom wall of the bag body unit abuts against the corner blocking member, the transfer component presses the bottom wall of the bag body unit and rotates so that the bag body unit rotates around the corner blocking member.

[0028] With the above-mentioned technical solution, the unique shape of the inverted conical blocking rod allows the bag unit to be conveyed. As the corner of its bottom wall gradually approaches the inverted conical blocking rod, the tapered side surface provides a gradually converging guide path for the bag unit, preventing the corner of the bag unit's bottom wall from colliding with the corner blocking member and causing it to tilt, thereby affecting the bag unit's rotation. The transfer component is arbitrarily mounted on the frame and positioned closer to the center of the entrance to the second conveying section. When the corner of the bag unit's bottom wall abuts the corner blocking member, the transfer component descends and presses against the bag unit's bottom wall, rotating while pressing. This prevents the bag unit from slipping or deviating from its rotation trajectory during rotation. This ensures that the bag unit rotates at a predetermined speed and angle, further enhancing the stability of the reversal. Even when handling heavy bags or bags with low surface friction, the transfer component's pressure ensures smooth reversal.

[0029] According to the bottom sealing device of the packaging bag provided in the present application, the reversing mechanism also includes an extrusion conveying wheel arranged on the upstream side of the transfer component in the production direction, the extrusion conveying wheel is rotatably connected to the frame, and the transfer component includes a lifting component arranged on the frame and an extrusion rotating head rotatably connected to the lifting end of the lifting component; the extrusion conveying wheel rotates and moves the bag body unit toward the transfer component along the production direction, the lifting component links the extrusion rotating head to squeeze the bottom wall of the bag body unit, and the extrusion rotating head rotates synchronously with the bag body unit.

[0030] By adopting the above technical solution, the extrusion conveying wheel can be rotatably connected to the frame and move the bag unit toward the transfer component along the production direction. It can provide continuous conveying force for the bag unit during the entire conveying process, allowing the bag unit to approach the transfer component at a uniform speed and in a stable state, thereby ensuring the stability of the bag unit's reversal.

[0031] According to the bottom sealing device of the packaging bag provided in the present application, the extrusion conveying wheel is sequentially formed with an arc-shaped extrusion surface and an avoidance gap along its circumference, and the arc length of the arc-shaped extrusion surface is smaller than the length of the bag body unit.

[0032] By adopting the above technical solution, an arc-shaped extrusion surface and an avoidance gap are sequentially formed along the circumference of the extrusion conveying wheel. In this way, the contact angle between the extrusion conveying wheel and the bag unit is adjusted so that the arc-shaped extrusion surface contacts the bag unit, and the avoidance gap can avoid the handle, bag opening and other features of the bag unit, thereby preventing the extrusion conveying wheel from excessively interfering with the bag unit, causing the bag unit to pause or fail to change direction.

[0033] According to the bottom sealing device of the packaging bag provided in the present application, the first bottom sealing mechanism includes a rotating shaft rotatably connected to the frame, a pressing knife and a sealing wheel sequentially arranged on the rotating shaft along the circumference of the rotating shaft; the rotation of the rotating shaft sequentially links the pressing knife to abut against the bending line of the first bottom surface and the sealing wheel to roll on the first bottom surface.

[0034] By adopting the above-mentioned technical solution, the present application sets the first bottom sealing mechanism to include a pressing knife and a sealing wheel which are sequentially arranged on the rotating shaft along the circumference of the rotating shaft. When the first bottom surface is sealed, the first bottom surface can be sealed by simply cooperating with the pressing knife and the sealing wheel without setting up a complex structure, which is conducive to simplifying the structure of the first bottom sealing mechanism and making it easier to disassemble and assemble the first bottom sealing mechanism.

[0035] The present application also provides a packaging bag production device, comprising: a base material supply device, a barrel forming device, a sealing device, a bottom sealing device as described above, a waste discharge device and a collection device arranged in sequence along the production direction; wherein the base material supply device is used to convey the sheet base material to the next station; the barrel forming device receives the base material conveyed by the base material supply device and shapes the base material into a continuous barrel structure; the sealing device comprises a large drum body, on which a cutting mechanism and a bottom opening mechanism are arranged in sequence along the production direction; the cutting mechanism is used to cut the barrel structure received by the sealing device into pieces; Cut into single bag units, the bottom opening mechanism is used to bend the bottom wall of the single bag unit toward one side of the bag unit, and form an intermediate support part, a first bottom surface and a second bottom surface located on both sides of the intermediate support part; the first bottom sealing mechanism is arranged on the big drum body, and is located on the downstream side of the bottom opening assembly along the production direction, and is used to seal the first bottom surface and the second bottom surface to the intermediate support part respectively; the waste discharge device is used to detect the bag body sealed by the second bottom sealing mechanism and remove waste products; the collection device is used to collect qualified packaging bags that have not been removed by the waste discharge device.

[0036] By adopting the above technical solution, the packaging bag making equipment provided by the present application includes the bottom sealing device of the above structure. When the packaging bag is made, the first bottom sealing mechanism located on the drum body only seals the first bottom surface. When the second bottom sealing mechanism seals the second bottom surface, the second bottom sealing mechanism includes a limit assembly arranged on the frame and a guide sealing assembly arranged on one side of the limit assembly, and the limit assembly has an abutment surface extending along the production direction. When the bag unit passes through the second bottom sealing mechanism, the abutment surface presses on the middle support portion of the bag unit, and one side edge is aligned with the bending line of the second bottom surface relative to the middle support portion. During the process of the bag unit gradually moving along the production direction, the guide sealing assembly guides the second bottom surface to bend relative to the middle support portion and overlap and fix it on the middle support portion and the first bottom surface. During the whole process, the various structures in the second bottom sealing mechanism will not produce indentations or other marks on the corresponding position of the second bottom surface on the side wall of the bag unit, so that the final packaging bag has a better appearance.

[0037] The present application also provides a method for manufacturing a packaging bag, comprising the following steps:

[0038] forming a sheet base material into a continuous cylindrical structure;

[0039] Cutting the continuous cylindrical structure into individual bag units;

[0040] bending the bottom wall of a single bag unit toward one side of the bag unit;

[0041] Convey the bag unit along the production direction with the length direction of the bag unit coinciding with the production direction;

[0042] sealing the first bottom surface of the bottom wall to the middle supporting portion of the bottom wall;

[0043] Transforming the posture of the bag unit so that the length direction of the bag unit is perpendicular to the production direction;

[0044] The second bottom surface of the bottom wall is sealed to the middle supporting portion of the bottom wall.

[0045] By adopting the above-mentioned technical scheme, the manufacturing method provided by the present application, when performing the bottom sealing operation on the bag body unit, first seals the first bottom surface with the length direction of the bag body unit coinciding with the production direction. After the first bottom surface is sealed, the posture of the bag body unit is changed so that the length direction of the bag body unit is perpendicular to the production direction; then the second bottom surface of the bottom wall is sealed to the middle support part of the bottom wall. During the process, the first bottom surface and the second bottom surface of the bag body unit are sealed in two steps, and the bag body unit is switched to different postures in the two steps. In this way, based on the structural characteristics of the first bottom surface and the second bottom surface, a bottom sealing mechanism adapted to them can be set at the two bottom sealing stations; it is not only beneficial to eliminate the indentations on the side wall of the bag body unit corresponding to the second bottom surface, but also, when applied to the manufacturing equipment of various packaging bags, it does not require major matching improvements to other structures, so as to achieve the overall coordination of the bottom sealing device and the manufacturing equipment, and has the advantage of good applicability. And the two bottom sealing mechanisms can be set up independently, and their sealing action will not affect the transportation of the bag unit. The packaging bag does not need to pause between the two sealing stations, which can ensure the continuous processing of the bag unit.

[0046] According to the manufacturing method of the packaging bag provided in the present application, before sealing the second bottom surface of the bottom wall to the middle support portion of the bottom wall, it also includes: aligning the bending line of the second bottom surface in the bag body unit with the edge of one side of the abutment surface of the limiting component in the second bottom sealing mechanism.

[0047] By adopting the above technical solution, after the bag unit rotates in the direction, even if there is a deviation between the conveying path of the bag unit and the second conveying part, the present application can ensure the success rate of sealing the second bottom surface and improve the aesthetics of the sealing by aligning the bending line of the second bottom surface with the edge of one side of the abutting surface of the limiting component in the second bottom sealing mechanism.

[0048] The present application also provides a packaging bag, which is manufactured using the above-mentioned manufacturing method, and the packaging bag includes a bag body with a accommodating cavity, the bag body including a pair of main walls arranged opposite to each other in the thickness direction of the bag body, a pair of side walls arranged opposite to each other in the width direction of the bag body, and a bottom wall arranged at the bottom of the bag body along the height direction of the bag body, and the pair of main walls and the pair of side walls surround the top of the bag body to form a bag opening; the bottom wall includes an intermediate support part, a first bottom dividing surface and a second bottom dividing surface respectively located on both sides of the intermediate support part along the thickness direction of the packaging bag; the intermediate support part is bent inward relative to the side wall of the packaging bag, the first bottom dividing surface and the second bottom dividing surface are respectively bent toward the intermediate support part and fixed on the corresponding surfaces of the intermediate support part, and the opposite ends of the first bottom dividing surface and the second bottom dividing surface are overlapped and fixed to each other; and, the outer wall surface of the front side of one of the pair of main walls is a smooth plane, a bending line is formed on the other main wall near the bottom surface, and the other main wall is a smooth plane from the bending line to the bag opening.

[0049] By adopting the above-mentioned technical solution, the packaging bag provided in the present application is manufactured by the above-mentioned method. As a result, there will be no indentations on the side wall of the packaging bag corresponding to the second bottom surface. Not only is the packaging bag beautiful in appearance, but the packaging bag will not bend or fall over due to the indentations when in the unfolded state. The packaging bag has better stability, which is conducive to users conveniently placing items into the bag body, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A schematic structural diagram of the bottom sealing device of the packaging bag provided in Example 1 of the present application;

[0051] Figure 2 This is a schematic structural diagram of the first bottom sealing mechanism in the bottom sealing device of the packaging bag provided in Example 1 of the present application;

[0052] Figure 3 This is a schematic structural diagram of the second bottom sealing mechanism in the bottom sealing device of the packaging bag provided in Example 1 of the present application;

[0053] Figure 4 This is a schematic structural diagram of the reversing mechanism in the bottom sealing device of the packaging bag provided in Example 1 of the present application;

[0054] Figure 5 This is a schematic structural diagram of the alignment adjustment mechanism in the bottom sealing device of the packaging bag provided in Example 1 of the present application;

[0055] Figure 6 This is a schematic structural diagram of the folding component in the bottom sealing device of the packaging bag provided in Example 1 of the present application;

[0056] Figure 7 A schematic diagram of the structure of the packaging bag manufacturing equipment provided in Example 2 of the present application;

[0057] Figure 8 A flow chart of a method for manufacturing a packaging bag provided in Example 3 of the present application;

[0058] Figure 9 A schematic diagram of the structure of the packaging bag provided in Example 4 of the present application;

[0059] Figure 10 This is a schematic diagram of the structure of the bag unit of the packaging bag provided in Example 4 of the present application after cutting;

[0060] Figure 11 A schematic structural diagram of the packaging bag provided in Example 4 of the present application, wherein the bottom of the bag is in an open state;

[0061] Figure 12 This is a schematic diagram of the structure in which the first bottom surface of the packaging bag provided in Example 4 of the present application is sealed.

[0062] Description of reference numerals:

[0063] 10. Packaging bags;

[0064] 101. First bottom surface; 102. Second bottom surface; 103. Middle support portion;

[0065] 100. Bottom sealing device;

[0066] 110. First back cover organization;

[0067] 111, rotating shaft; 112, pressing knife; 113, sealing wheel;

[0068] 120. Second back cover mechanism;

[0069] 121. Position limiting component; 122. Guide and sealing component; 1221. Folding component; 12210. Guide surface; 1222. Sealing component; 123. Glue spraying component; 124. Air blowing component;

[0070] 130. Bag conveying device;

[0071] 131. First conveying section; 132. Second conveying section; 133. Reversing mechanism; 1331. Corner blocking member; 1332. Transfer component; 1333. Extrusion conveying wheel; 134. Alignment adjustment mechanism; 1341. Limiting baffle; 1342. Adjustment wheel; 1343. Pressing limiting component;

[0072] 140, rack;

[0073] 200, drum forming device;

[0074] 300. Sealing device;

[0075] 400. Waste discharge device. DETAILED DESCRIPTION

[0076] The sealing process of packaging bags is an important process in the production process of packaging bags, especially for paper packaging bags made from roll paper through a continuous production process. The sealing position is usually located at the bottom of the bag body, and the bottom of a single bag unit needs to be sealed before a complete packaging bag can be made. In the sealing process, the existing technology often uses continuous production equipment to seal the two sides of the bottom of the bag unit at one station, but before sealing, the two sides will be opened into a flat shape and parallel to the length direction of the bag unit; one of the bottom sides will be attached to the side wall of the bag unit. This will result in that when one bottom side is sealed, the folding knife of the bottom sealing mechanism will press on the side wall of the bag unit, eventually resulting in obvious indentations on the side wall of the formed packaging bag, which not only affects the appearance, but also affects the stability of the packaging bag when it is open.

[0077] In this regard, the present application proposes a bottom sealing device for packaging bags. If the packaging bag manufacturing equipment adopts this bottom sealing device, it can not only produce more beautiful packaging bags while ensuring the production efficiency of the manufacturing equipment, but also be easier to adapt to other structures of the manufacturing equipment, especially when modifying old machines, it is easier and the modification cost is lower.

[0078] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0079] Example 1:

[0080] like Figure 1 As shown, this embodiment provides a bottom sealing device 100 for a packaging bag, which seals the bottom of a cylindrical bag unit to form the bottom wall of the packaging bag 10.

[0081] It should be understood that the tubular bag unit refers to the tubing device 200 of the manufacturing equipment folding the sheet base material in half and sealing it, and cutting it into independent bag units 104 using the cutting device (see Figure 9 ).

[0082] The packaging bag 10 may be made of various materials such as paper, plastic, etc., and the packaging bag 10 has an opening and a handle at the top and a bottom wall at the bottom.

[0083] In this embodiment, the structure of the packaging bag 10 can be referred to in Example 4. Figures 8 to 11 The bottom wall of the packaging bag 10 includes a middle support portion 103, a first bottom surface 101 and a second bottom surface 102 located on both sides of the middle support portion 103 along the thickness direction of the packaging bag 10; the middle support portion 103 is bent inward relative to the side wall of the packaging bag 10, and the first bottom surface 101 and the second bottom surface 102 are respectively bent toward the middle support portion 103 and fixed on the corresponding surfaces of the middle support portion 103, and the opposite ends of the first bottom surface 101 and the second bottom surface 102 are overlapped and fixed to each other.

[0084] like Figure 1 As shown, the bottom sealing device 100 is introduced below:

[0085] In this embodiment, the bottom sealing device 100 includes a frame 140 , a first bottom sealing mechanism 110 and a second bottom sealing mechanism 120 .

[0086] Specifically, regarding the rack 140 , the rack 140 serves as a supporting structure for the entire device and can be made of high-strength metal materials, such as stainless steel or aluminum alloy, to ensure the stability and reliability of the device during operation.

[0087] The first bottom sealing mechanism 110 is disposed on the frame 140 and is used to seal the first bottom surface 101 to the bottom surface. The first bottom surface 101 is the bottom surface of the bottom wall closer to the middle supporting portion 103 .

[0088] In this embodiment, the structure of the first bottom sealing mechanism 110 is not limited. For example, the first bottom surface 101 may be sealed by cooperation of a pressure wheel and a robot.

[0089] In one embodiment, Figure 2 As shown, it may also include a rotating shaft 111 rotatably connected to the frame 140, and a pressing knife 112 and a sealing wheel 113 are sequentially arranged on the rotating shaft along the circumference of the rotating shaft 111. The rotation of the rotating shaft sequentially links the pressing knife 112 to abut against the bending line of the first bottom surface 101, and the sealing wheel 113 rolls on the first bottom surface 101.

[0090] Specifically, the rotating shaft 111 can be connected to the frame 140 via bearings, and the pressing blade 112 and sealing wheel 113 can be made of wear-resistant, high-strength materials. During the sealing process, when the bag unit 104 is transported to the first bottom sealing mechanism 110 station, the rotating shaft begins to rotate. As the rotating shaft 111 rotates, the pressing blade 112 will first abut the bend line of the first bottom surface 101, applying pressure to the first bottom surface 101, causing it to bend along the bend line. Subsequently, the first bottom surface 101 can be pressed using a sealing wheel 113 or a pressing plate, thereby sealing the first bottom surface 101.

[0091] It should be understood that the sealing wheel 113 can seal the first bottom surface 101 to the bottom surface by heating or pressurizing, thereby completing the sealing operation of the first bottom surface 101. Alternatively, the bag unit 104 may be pre-coated with glue when it is transported to the first bottom sealing mechanism 110 station, and the first bottom surface 101 is pressed and bonded to the middle support portion 103. Since the first bottom surface 101 is the bottom surface of the bottom wall closer to the middle support portion 103, when the bag bottom is open, the first bottom surface 101 does not adhere to the side wall of the bag unit 104. This structure is simple and the operation is independent, and the sealing is completed by the combination of the pressing knife 112 and the sealing wheel 113.

[0092] like Figure 3 As shown, the second bottom sealing mechanism 120 is arranged on the frame 140 and is located on the downstream side of the first bottom sealing mechanism 110 along the production direction of the packaging bag 10, and is used to seal the second bottom surface 102 to the bottom surface, and the end of the second bottom surface 102 is overlapped and fixed to the end of the first bottom surface 101.

[0093] In this embodiment, the second bottom sealing mechanism 120 includes a limiting assembly 121 disposed on the frame 140 and a guiding sealing assembly 122 disposed on one side of the limiting assembly 121 .

[0094] Specifically, the limiting component 121 has a contact surface extending along the production direction; and when the bag body unit passes through the second bottom sealing mechanism 120, the contact surface is pressed on the middle support portion 103 of the bag body unit, and one side edge of the contact surface is aligned with the bending line of the second bottom surface 102 relative to the middle support portion 103, and the guiding sealing component 122 guides the second bottom surface 102 to bend relative to the middle support portion 103 and overlap and fix on the middle support portion 103 and the first bottom surface 101.

[0095] The bottom sealing device 100 provided in this embodiment utilizes the above-mentioned scheme. Since the bottom sealing device 100 includes a first bottom sealing mechanism 110 and a second bottom sealing mechanism 120, and the first bottom sealing mechanism 110 and the second bottom sealing mechanism 120 are arranged in sequence along the production direction, they are two independent bottom sealing structures; in this way, when the bag unit passes through the workstations where the first bottom sealing mechanism 110 and the second bottom sealing mechanism 120 are located in sequence, the first bottom sealing mechanism 110 and the second bottom sealing mechanism 120 can act independently to seal the first bottom surface 101 and the second bottom surface 102, and the two sealing actions will not interfere with each other.

[0096] During the process of sealing the bottom of the bag, when the first bottom sealing mechanism 110 seals the first bottom surface 101, since the first bottom surface 101 is the bottom surface in the bottom wall that is closer to the middle support portion 103, the first bottom surface 101 is not attached to the side wall of the bag body unit. Based on the characteristics of the first bottom surface 101, the first bottom sealing mechanism 110 can achieve the sealing of the first bottom surface 101 with a simple structure.

[0097] When the second bottom sealing mechanism 120 seals the second bottom surface 102, since the second bottom surface 102 is attached to the side wall of the bag unit when it is not sealed, the second bottom sealing mechanism 120 in this embodiment includes a limiting component 121 arranged on the frame 140, and a guiding sealing component 122 arranged on one side of the limiting component 121, and the limiting component 121 has a contact surface extending along the production direction; when the bag unit passes through the second bottom sealing mechanism 120, the contact surface is pressed on the middle support part 103 of the bag unit, and one side edge is aligned with the bending line of the second bottom surface 102 relative to the middle support part 103; in the process of the bag unit gradually moving along the production direction, the guiding sealing component 122 will guide the second bottom surface 102 to bend relative to the middle support part 103 and overlap and fix it on the middle support part 103 and the first bottom surface 101. During the entire process, the various structures in the second bottom sealing mechanism 120 will not produce indentations or other marks on the side walls of the bag unit corresponding to the second bottom surface 102 , thereby making the final packaging bag 10 more aesthetically pleasing.

[0098] Furthermore, in the bottom sealing device 100 provided in this embodiment, since the first bottom sealing mechanism 110 and the second bottom sealing mechanism 120 are independently arranged, their sealing action will not affect the transportation of the bag unit, and the packaging bag 10 does not need to pause between the two sealing stations, which can ensure continuous processing of the bag unit.

[0099] Furthermore, the first bottom sealing mechanism 110 and the second bottom sealing mechanism 120 in the bottom sealing device 100 provided by this application can be independently designed based on the corresponding posture characteristics of the first bottom facet 101 and the second bottom facet 102. When applied to various packaging bag production equipment, no major matching improvements to other structures are required to achieve overall coordination between the bottom sealing device 100 and the production equipment, thus having the advantage of good applicability. Therefore, when the bottom sealing device 100 provided by this embodiment is applied to packaging bag production equipment, it can not only produce more aesthetically pleasing packaging bags 10 while maintaining the production efficiency of the production equipment, but also more easily adapt to other structures of the production equipment, especially making it easier to retrofit older equipment models and reducing the cost of the retrofit.

[0100] Furthermore, in this embodiment, the first bottom sealing mechanism 110 and the second bottom sealing mechanism 120 may be configured as a structure with a self-contained conveying function, or may be provided with an additional conveying device.

[0101] In one embodiment, Figure 1 and Figure 4 As shown, the bottom sealing device 100 further includes a bag conveying device 130 . The bag conveying device 130 is disposed on a frame 140 and extends from an inlet of the first bottom sealing mechanism 110 to an outlet of the second bottom sealing mechanism 120 .

[0102] Regarding the bag conveying device 130, in this embodiment, the bag conveying device 130 includes a first conveying portion 131, a second conveying portion 132, and a reversing mechanism 133 disposed between the first conveying portion 131 and the second conveying portion 132. The first conveying portion 131 extends through the first bottom sealing mechanism 110, and the second conveying portion 132 extends through the second bottom sealing mechanism 120.

[0103] Specifically, the first conveying section 131 conveys the bag unit along the production direction through the first bottom sealing mechanism 110 with the length direction of the bag unit coinciding with the production direction. The reversing mechanism 133 changes the posture of the bag unit from the first conveying section 131 so that the length direction of the bag unit is perpendicular to the production direction and conveys the bag unit to the second conveying section 132. The second conveying section 132 receives the reversing bag unit and conveys the bag unit along the production direction through the second bottom sealing mechanism 120. This allows the bag unit to switch to different postures when being bottom-sealed in the two bottom-sealing stations based on the corresponding structures and bottom-sealing actions of the first bottom-sealing mechanism 110 and the second bottom-sealing mechanism 120.

[0104] With this solution, since the first bottom sealing mechanism 110 adopts a simple structure combination of a pressing knife 112 and a sealing wheel 113, the sealing of the first bottom surface 101 can be achieved, and the first bottom surface 101 is close to the bottom position of the bag unit. After the bag unit is cut and the bottom is opened, the sealing action of the first bottom surface 101 is performed directly on the downstream side of the bag unit conveying direction. This is not only efficient, but also beneficial to the structural design of the first bottom sealing mechanism 110; and the second bottom surface 102 is attached to the side wall of the bag unit when it is not sealed. The present application can convey the bag unit in a direction perpendicular to the production direction through the reversing mechanism 133, so that the folding action of the second bottom surface 102 is perpendicular to the conveying direction. In this way, the second bottom sealing mechanism 120 is set on one side of the bag unit conveying path to achieve the sealing action of the second bottom surface 102, and the folding action of the second bottom surface 102 by the second bottom sealing mechanism 120 will not affect the normal conveying of the bag unit. By utilizing such a structure, not only can the continuous production of the packaging bag 10 be ensured, but also the spatial arrangement freedom of the first bottom sealing mechanism 110 and the second bottom sealing mechanism 120 can be increased.

[0105] Furthermore, based on the above-mentioned bag conveying device 130, even if there is a deviation between the conveying path of the bag unit and the second conveying portion 132, in this embodiment, as shown in FIG. Figure 5 As shown, the bag conveying device 130 may further include an alignment adjustment mechanism 134, which is arranged on the frame 140 and located between the reversing mechanism 133 and the limit assembly 121. The alignment adjustment mechanism 134 drives the bag unit that has been reversed by the reversing mechanism 133 to move in a direction perpendicular to the production direction, so that the bending line of the second bottom surface 102 can be aligned with the side edge of the abutment surface, thereby ensuring the success rate of sealing the second bottom surface 102 and improving the aesthetics of the sealing.

[0106] The structure of the alignment adjustment mechanism 134 is not limited, for example, it can be configured as an electric adjustment push rod, a drag suction cup, etc.

[0107] In one embodiment, the alignment adjustment mechanism 134 includes a limit baffle 1341, an adjusting wheel 1342 and a pressing limit component 1343; the limit baffle 1341 extends along the production direction and is adjustably arranged on the frame 140, and is located on the side corresponding to the bottom wall of the packaging bag 10; the adjusting wheel 1342 is rotatably arranged on the frame 140 around the production direction, and the top of the adjusting wheel 1342 protrudes from the gap of the second conveying part 132 in the vertical direction; the pressing limit component 1343 is connected to the frame 140 in a liftable manner and is located above the adjusting wheel 1342. For example, it can be an electric pressure rod arranged above the adjusting wheel 1342, and the end of the electric pressure rod has a pressing head.

[0108] The first conveying part 131 and the second conveying part 132 may both include conveyor belts extending in the production direction. The gap in the second conveying part 132 may refer to a conveyor belt consisting of five or six conveyor belts arranged side by side, with a gap extending in the production direction between the two conveyor belts.

[0109] In this embodiment, the limiting baffle 1341 extends along the production direction and is adjustable in position on the frame 140, located on the side corresponding to the bottom wall of the packaging bag 10. During the alignment of the bag unit, the limiting baffle 1341 can serve as a fixed reference boundary to limit the bottom of the bag unit. The adjusting wheel 1342 is rotatably arranged on the frame 140 around the production direction, and the top protrudes from the gap of the second conveying part 132 in the vertical direction. When the bag unit is conveyed to the position of the adjusting wheel 1342, the rotation of the adjusting wheel 1342 can generate a lateral thrust on the bag unit, thereby adjusting the position of the bag unit. At the same time, the pressing limiting component 1343 is liftably connected to the frame 140 and is located above the adjusting wheel 1342. It can press the bag unit downward so that the bag unit maintains a stable posture while being pushed by the adjusting wheel 1342, thereby preventing the bag unit from tilting or shaking during the position adjustment process.

[0110] It should be understood that in this embodiment, a motor for driving the adjusting wheel 1342 to rotate can be set on one side of the adjusting wheel 1342. When the bag unit is transported to the position of the adjusting wheel 1342, the motor is used to drive the adjusting wheel 1342 to rotate to generate a lateral thrust on the bag unit. The lateral direction in this embodiment refers to the direction perpendicular to the production direction.

[0111] Furthermore, in the bag conveying device 130, the reversing mechanism 133 may include a corner blocking member 1331, which is arranged at the entrance of the second conveying part 132 and is located at a position corresponding to the corner of one side of the bottom wall of the packaging bag 10 close to the limiting component 121.

[0112] During operation, the corner of the bottom wall of the bag unit passing from the first conveying section 131 to the entrance of the second conveying section 132, near the stop assembly 121, abuts against the corner blocking member 1331. The bag unit then rotates around the corner blocking member 1331 to transform into a position perpendicular to the production direction. The entire process does not require complex mechanical movements or lengthy adjustments. This reversing action can also match the continuous conveying speed of the conveyor belt, without causing interruptions or pauses in the conveying process. This ensures the continuity and smoothness of production and improves production efficiency.

[0113] The structure of the corner blocking member 1331 is not limited, for example, it can be an arc-shaped block, a tapered blocking rod, etc.

[0114] In one embodiment, Figure 4 As shown, the corner blocking member 1331 is configured as an inverted conical blocking rod. The unique shape of the inverted conical blocking rod allows the conical side to provide a gradually converging guiding path for the bag unit when the corner of the bottom wall gradually approaches the inverted conical blocking rod during the conveyance of the bag unit, thereby preventing the corner of the bottom wall of the bag unit from colliding with the corner blocking member 1331 and tilting upward to affect the rotation of the bag unit.

[0115] Furthermore, in this embodiment, the reversing mechanism 133 also includes a transfer component 1332, which can be raised and lowered on the frame 140 and is located on one side of the corner blocking member 1331, and the transfer component 1332 is closer to the middle position of the entrance of the second conveying part 132 in a direction perpendicular to the production direction.

[0116] When the corner of the bag unit's bottom wall abuts against the corner blocking member 1331, the transfer member 1332 presses against the bag unit's bottom wall and rotates, causing the bag unit to rotate around the corner blocking member 1331. This prevents the bag unit from slipping or deviating from its rotation trajectory during rotation. By rotating the bag unit at a predetermined speed and angle, the stability of the reversal is further enhanced. Even when handling heavy bags or bags with low surface friction, the transfer member 1332 ensures smooth reversal through pressure.

[0117] The structure of the transfer component 1332 is not limited. For example, it can be an automatically retractable electric wheel, or it can be a telescopic rod and a rotating head, with the rotating head connected to the end of the telescopic rod.

[0118] In one embodiment, the transfer component 1332 may include a lifting component and an extrusion rotating head. The lifting component is arranged on the frame 140, and the extrusion rotating head is rotatably connected to the lifting component. The lifting component may be provided with an electric or pneumatic telescopic rod. The lifting component links the extrusion rotating head to squeeze the bottom wall of the bag body unit, and the extrusion rotating head rotates synchronously with the bag body unit.

[0119] Furthermore, in this embodiment, the reversing mechanism 133 may also include an extrusion conveying wheel 1333 arranged on the upstream side of the transfer component 1332 in the production direction. The extrusion conveying wheel 1333 is rotatably connected to the frame 140. The extrusion conveying wheel 1333 rotates to convey the bag unit toward the transfer component 1332 along the production direction. In this way, a continuous conveying force can be provided to the bag unit during the entire conveying process, and the bag unit can approach the transfer component 1332 at a uniform speed and in a stable state, thereby ensuring the stability of the reversal of the bag unit.

[0120] In this embodiment, the rotating shaft of the extrusion conveying wheel 1333 can be connected to the driving motor of the conveyor belt through a chain drive, or a separate driving motor can be arranged on the frame 140, located on one side of the extrusion conveying wheel 1333, and the driving motor is directly fixedly connected to the rotating shaft of the extrusion conveying wheel 1333.

[0121] Regarding the extrusion and conveying wheel 1333, it is important to understand that in this embodiment, the extrusion and conveying wheel 1333 is formed with an arc-shaped extrusion surface and a relief notch along its circumference, and the arc length of the arc-shaped extrusion surface is less than the length of the bag unit. Thus, by adjusting the contact angle between the extrusion and conveying wheel 1333 and the bag unit, the arc-shaped extrusion surface contacts the bag unit, and the relief notch can avoid features such as the bag unit's handle and opening, thereby preventing the extrusion and conveying wheel 1333 from excessively interfering with the bag unit, causing the bag unit to stall or fail to change direction.

[0122] Based on the above structure, after the bag unit is reversed and transported to the second transport portion 132, the second bottom sealing mechanism 120 seals the second bottom surface 102 of the bag unit. The second bottom sealing mechanism 120 and its working principle are further described below:

[0123] Specifically, such as Figure 3As shown, the structures of the limiting component 121 and the guiding and sealing component 122 in the second bottom sealing mechanism 120 are not limited. For example, the limiting component 121 can be provided with a pressure wheel, a pressure plate, etc., and the guiding and sealing component 122 can be provided with an ultrasonic ironing plate. The ultrasonic ironing plate can be provided with a swingable guiding structure. When the bag unit is transported through the guiding and sealing component 122, the ultrasonic ironing plate swings to fold the second bottom surface 102 and simultaneously iron and seal the second bottom surface 102. Of course, this structure is suitable for bag units made of materials that are easy to iron (such as plastic film, non-woven fabric, etc.). The guiding and sealing component 122 can also be composed of a folding component 1221 and a sealing component 1222. The folding component 1221 is used to first bend the second bottom surface 102, and then the sealing component 1222 is used to seal the second bottom surface 102.

[0124] In this embodiment, the limiting assembly 121 includes a limiting plate extending along the production direction, and one side of the limiting plate has an abutment surface extending along the horizontal direction; the middle support portion 103 is continuously pressed during the movement of the bag body, and one side edge is aligned with the bending line of the second bottom surface 102 relative to the middle support portion 103, so that the second bottom surface 102 can be bent according to a predetermined position and angle during the bending process, and the abutment surface can continuously press the middle support portion 103 during the movement of the bag body unit, so that the second bottom surface 102 will not shake or shift during the bending process. The guiding sealing assembly 122 includes a folding component 1221 and a sealing component 1222; the folding component 1221 is arranged on the other side of the limiting plate relative to the bending line in a direction perpendicular to the production direction, and bends the second bottom surface 102 along the bending line. The sealing component 1222 fixes and seals the second bottom surface 102 to the bottom surface, so that during the operation of the entire second bottom sealing mechanism 120, the various structures will not produce indentations or other traces on the corresponding positions of the second bottom surface 102 on the side walls of the bag unit.

[0125] The structure of the folding component 1221 is not limited. For example, it can be a rotatable folding plate. When the bag unit passes through the folding component 1221, the folding component 1221 flips over to bend the second bottom surface 102. The sealing component 1222 can be set to a hot pressing sealing wheel 113. After the second bottom surface 102 is bent, when the bag unit is conveyed through the hot pressing sealing wheel 113, the hot pressing sealing wheel 113 rolls and irons the second bottom surface 102 to achieve sealing. Similarly, this structure is suitable for the bag unit 104 to be made of materials that are easy to iron (such as plastic film, non-woven fabric, etc.).

[0126] Of course, the second bottom surface 102 may also be pre-coated with glue. For example, in one embodiment, Figure 6As shown, the folding component 1221 is configured as a guide plate extending along the production direction. The guide plate has a guide surface 12210 extending in a curved shape relative to the horizontal direction. The curved surface design can provide a continuous and smooth guide for the second bottom surface 102. During the movement of the bag unit along the production direction, the second bottom surface 102 will naturally change direction gradually along the shape of the curved guide surface to achieve bending.

[0127] Furthermore, the angle between the guide surface 12210 and the conveying plane of the second conveying portion 132 is along the production direction ( Figure 6 The angle of the second bottom surface 102 is gradually reduced (in the direction of the arrow in the figure); the sealing component 1222 is configured as a sealing pressure wheel. In this way, the guiding force applied to the second bottom surface 102 is relatively gentle when it starts to bend, and excessive stress concentration will not be generated due to a sudden change in angle, resulting in wrinkles or damage to the second bottom surface 102. As the bag unit moves, the angle gradually decreases and the guiding force gradually increases, which can more effectively push the second bottom surface 102 to complete the bending action, making the bending process of the second bottom surface 102 more stable. Moreover, the curved guiding surface is relatively smooth, which can reduce the frictional resistance between the second bottom surface 102 and the guide plate during the folding process. Compared with the guiding structure with right angles or sharp edges, the curved surface design can prevent the second bottom surface 102 from being scratched or stuck when bending, so that the second bottom surface 102 can bend more smoothly along the guiding surface. By setting the sealing component 1222 as a sealing pressure wheel, there is rolling contact between the sealing pressure wheel and the second bottom surface 102. The sealing pressure wheel can apply uniform pressure to the second bottom surface 102 during rotation, so that the second bottom surface 102 has a better sealing effect.

[0128] Furthermore, based on the above structure, for the packaging bag 10 whose second bottom surface 102 is sealed with glue, the second bottom sealing mechanism 120 further includes a glue spraying component 123 and an air blowing component 124 .

[0129] Specifically, the glue spraying component 123 , the air blowing component 124 , the folding component 1221 , and the sealing component 1222 are sequentially arranged on the frame 140 along the production direction.

[0130] The structure of the glue spraying component 123 is not limited; for example, it can be configured as a pneumatic glue gun, an electric glue gun, etc. Specifically, the glue spraying component 123 is positioned at a location corresponding to the inner surface of the second bottom surface 102, and sprays glue on the portion where the second bottom surface 102 overlaps and is fixed to the intermediate support portion 103 and the first bottom surface 101. By providing the glue spraying component 123, when in operation, the glue spraying component 123 sprays glue onto the inner surface of the second bottom surface 102. This spraying method ensures a more even coating of the glue on the inner surface of the second bottom surface 102, facilitating a better subsequent bonding effect on the second bottom surface 102.

[0131] The structure of the blowing component 124 is not limited, and it can be an air nozzle connected to an external air pump, or it can be an electric blowing nozzle with its own air pump. Specifically, the blowing component 124 is arranged on one side of the second bottom surface 102 and blows air toward the corresponding surface of the second bottom surface 102, so that the second bottom surface 102 smoothly enters the folding component 1221. By using the blowing component 124, after the second bottom surface 102 is coated with glue, even if it is tightly attached to the surface of the second conveying part 132 due to factors such as increased weight, the present application arranges the blowing component 124 before the folding component 1221, and the air flow blown by the blowing component 124 can not only separate the second bottom surface 102 from the surface of the second conveying part 132, but also make the second bottom surface 102 open to a certain angle before being folded by the folding component 1221, thereby ensuring the stability of the smooth bending of the second bottom surface 102.

[0132] In summary, when the bottom sealing device 100 provided in this embodiment is used to seal the bottom of the bag unit, not only can a more beautiful packaging bag 10 be produced while ensuring the production efficiency of the production equipment, but it is also easier to adapt to other structures of the production equipment, especially when modifying old models of equipment, it is easier and the modification cost is lower.

[0133] Example 2:

[0134] This embodiment provides a packaging bag making device, such as Figure 7 As shown, it includes: a base material supply device (not shown), a barrel forming device 200, a sealing device 300, the bottom sealing device 100 in Example 1, a waste discharge device 400 and a collecting device (not shown) arranged in sequence along the production direction.

[0135] Specifically, the structure of the web supply device is not limited and may, for example, include a web reel, a tension controller, and conveyor guide rollers. The web reel stores the web sheet, the tension controller maintains a stable web tension, and the conveyor guide rollers guide the web sheet to the next workstation. During use, the web is unwound from the web reel, tensioned by the tension controller, and then guided by the conveyor guide rollers to the roll-forming device 200.

[0136] The structure of the barrel forming device 200 is not limited. For example, it may include a support template, a glue spraying unit and a pressure wheel arranged on the frame 140. The glue spraying unit is arranged upstream of the support template. Before the sheet base material is conveyed to the support template, the glue spraying unit sprays glue on the side of the sheet base material. The pressure wheel is arranged between the glue spraying unit and the support template to extrude and seal the side of the base material entering the support template. When the sheet base material is conveyed to the support template, it is wrapped around the support template to form a barrel structure.

[0137] The sealing device 300 may include a drum body, on which a cutting mechanism and a bottom opening mechanism are sequentially arranged along the production direction.

[0138] The structure of the cutting mechanism is not limited, for example, it includes a cutting knife and a driving motor. When the base material of the cylindrical structure is gradually conveyed, the driving motor drives the cutting knife to reciprocate, cutting the cylindrical structure received by the sealing device 300 into individual bag units.

[0139] The structure of the bottom opening mechanism is not limited, for example, it includes a splint. When a single bag unit is gradually transported on the drum, the splint clamps the bottom corner of the single bag unit and moves relative to the drum so that the bottom wall of the single bag unit bends toward one side of the bag unit, forming an intermediate support portion 103, a first bottom dividing surface 101 and a second bottom dividing surface 102 located on both sides of the intermediate support portion 103.

[0140] The first bottom sealing mechanism 110 is provided on the drum body and is located at the downstream side of the bottom opening assembly along the production direction, and is used for sealing the first bottom surface 101 and the second bottom surface 102 to the middle support portion 103 respectively.

[0141] The waste discharge device 400 has any structure and is used to inspect the bag body sealed by the second bottom sealing mechanism 120 and remove waste products. For example, the waste discharge device 400 may include a detector and a rejection structure. The detector is used to detect the quality of the packaging bag 10, such as whether the bottom seal is firm and the size is accurate. The rejection structure is used to remove detected waste products from the production line. During use, the packaging bag 10 processed by the bottom sealing device 100 is conveyed to the waste discharge device 400. The detector performs a quality inspection on the packaging bag 10. If any waste is found, the rejection structure removes the waste product from the production line to ensure that only qualified products enter the next process.

[0142] The collection device, which can be of any structure, is used to collect qualified packaging bags 10 that have not been rejected by the waste discharge device 400. For example, it may include a collection box for storing qualified products and a conveying device for transporting qualified products from the production line to the collection box. During use, qualified products tested by the waste discharge device 400 are transported to the collection device. The conveying device then delivers the qualified products to the collection box, completing the entire packaging bag 10 production process.

[0143] The packaging bag making device provided in this embodiment includes the bottom sealing device 100 of the above structure. When the packaging bag 10 is made, the first bottom sealing mechanism 110 located on the drum body only seals the first bottom surface 101. When the second bottom sealing mechanism 120 seals the second bottom surface 102, the second bottom sealing mechanism 120 includes a limiting component 121 provided on the frame 140 and a guiding sealing component 122 provided on one side of the limiting component 121. The limiting component 121 is provided on the bottom surface 102. 21 has an abutment surface extending in the production direction; when the bag unit passes through the second bottom sealing mechanism 120, the abutment surface presses against the middle support portion 103 of the bag unit, and one side edge aligns with the bending line of the second bottom surface 102 relative to the middle support portion 103; as the bag unit gradually moves along the production direction, the guiding and sealing assembly 122 guides the second bottom surface 102 to bend relative to the middle support portion 103 and overlap and fix it to the middle support portion 103 and the first bottom surface 101. Throughout this process, the various structures in the second bottom sealing mechanism 120 do not produce indentations or other marks on the sidewalls of the bag unit corresponding to the second bottom surface 102, resulting in a more aesthetically pleasing packaging bag 10.

[0144] Example 3:

[0145] This application also provides a method for making a packaging bag, such as Figure 8 As shown, the method can be applied to the production device in Example 2 and includes the following steps:

[0146] S1, forming the sheet base material into a continuous cylindrical structure;

[0147] S2, cutting the continuous tubular structure into individual bag units 104 (see Figure 10 status shown);

[0148] S3, bend the bottom wall of the single bag unit toward one side of the bag unit (see Figure 11 status shown);

[0149] S4, transporting the bag unit along the production direction with the length direction of the bag unit coinciding with the production direction;

[0150] S5, seal the first bottom surface 101 of the bottom wall to the middle support portion 103 of the bottom wall (see Figure 12 status shown);

[0151] S6. Transforming the posture of the bag unit so that the length direction of the bag unit is perpendicular to the production direction;

[0152] S7, seal the second bottom surface 102 of the bottom wall to the middle support portion 103 of the bottom wall (see Figure 9 status shown).

[0153] The manufacturing method provided in this embodiment, when performing the bottom sealing operation on the bag unit, first seals the first bottom surface 101 with the length direction of the bag unit coinciding with the production direction. After the first bottom surface 101 is sealed, the posture of the bag unit is changed to have the length direction of the bag unit perpendicular to the production direction; then the second bottom surface 102 of the bottom wall is sealed to the middle support portion 103 of the bottom wall. During the process, the first bottom surface 101 and the second bottom surface 102 of the bag unit are sealed in two steps, and the bag unit is switched to different postures in the two steps. In this way, based on the structural characteristics of the first bottom surface 101 and the second bottom surface 102, bottom sealing mechanisms adapted to them can be set at the two bottom sealing stations; this is not only conducive to eliminating the indentations on the side wall of the bag unit corresponding to the second bottom surface 102, but also, when applied to various packaging bag manufacturing equipment, it does not require major matching improvements to other structures to achieve overall coordination between the bottom sealing device 100 and the manufacturing equipment, and has the advantage of good applicability. And the two bottom sealing mechanisms can be set independently, and their sealing action will not affect the transportation of the bag unit. The packaging bag 10 does not need to pause between the two sealing stations, which can ensure the continuous processing of the bag unit.

[0154] Furthermore, before sealing the second bottom surface 102 of the bottom wall to the middle support portion 103 of the bottom wall, it also includes: aligning the bending line of the second bottom surface 102 in the bag unit with the edge of one side of the abutting surface of the limiting component 121 in the second bottom sealing mechanism 120.

[0155] Using this method, after the bag unit rotates, even if there is a deviation between the conveying path of the bag unit and the second conveying part 132, the present application can ensure the success rate of sealing the second bottom surface 102 and improve the aesthetics of the sealing by aligning the bending line of the second bottom surface 102 with the edge of one side of the abutting surface of the limiting component 121 in the second bottom sealing mechanism 120.

[0156] Example 4:

[0157] like Figures 9 to 12As shown, this embodiment provides a packaging bag 10, which is manufactured by the manufacturing method of Example 3, and the packaging bag 10 includes a bag body with a accommodating cavity, the bag body includes a pair of main walls arranged oppositely in the thickness direction of the bag body, a pair of side walls arranged oppositely in the width direction of the bag body, and a bottom wall arranged at the bottom of the bag body along the height direction of the bag body, and the pair of main walls and the pair of side walls surround the top of the bag body to form a bag opening; the bottom wall includes an intermediate support portion 103, a first bottom wall located on both sides of the intermediate support portion 103 along the thickness direction of the packaging bag 10, and a second bottom wall located on both sides of the intermediate support portion 103. The first bottom facet 101 and the second bottom facet 102; the middle support portion 103 is bent inward relative to the side wall of the packaging bag 10, the first bottom facet 101 and the second bottom facet 102 are respectively bent toward the middle support portion 103 and fixed on the corresponding surfaces of the middle support portion 103, and the opposite ends of the first bottom facet 101 and the second bottom facet 102 are overlapped and fixed to each other; and the outer wall surface of the front side of one of the pair of main walls is a smooth plane, a bending line is formed on the other main wall near the bottom surface, and the other main wall is a smooth plane from the bending line to the bag opening.

[0158] The packaging bag 10 provided in this embodiment is manufactured by the above-mentioned method. As there is no indentation on the side wall of the packaging bag 10 corresponding to the second bottom surface 102, the packaging bag 10 not only has a beautiful appearance, but also the packaging bag 10 is not easily bent or tilted due to the indentation in the unfolded state, and has better stability, which is conducive to users conveniently placing items into the bag body, and can enhance the user experience.

[0159] It should be noted that, in addition to the embodiments of the present invention described in the above specific embodiments, those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention is introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this embodiment. On the contrary, the purpose of introducing the invention in conjunction with the embodiment is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide an in-depth understanding of the present invention, the above description contains many specific details, and the present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0160] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0161] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0162] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0163] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0164] Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the above description is provided as a further detailed description of the present invention in conjunction with specific embodiments thereof, and that the specific implementation of the present invention is not limited to these descriptions. Those skilled in the art may make various changes in form and details, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A bottom sealing device for a packaging bag, which seals a tubular bag unit to form a bottom wall of the packaging bag, wherein the bottom wall of the packaging bag comprises a middle support portion, a first bottom surface and a second bottom surface located on both sides of the middle support portion along the thickness direction of the packaging bag; wherein: The middle support portion is bent inward relative to the side wall of the packaging bag, the first bottom surface and the second bottom surface are respectively bent toward the middle support portion and fixed to corresponding surfaces of the middle support portion, and opposite ends of the first bottom surface and the second bottom surface are overlapped and fixed to each other; characterized in that the bottom sealing device includes: frame; a first bottom sealing mechanism, the first bottom sealing mechanism being disposed on the frame and configured to seal the first bottom surface to the bottom surface, the first bottom surface being the bottom surface of the bottom wall closer to the middle supporting portion; A second bottom sealing mechanism is provided on the frame and is located downstream of the first bottom sealing structure along the production direction of the packaging bag, and is used to seal the second bottom surface to the bottom surface, with the end of the second bottom surface overlapping and fixed to the end of the first bottom surface; The second bottom sealing mechanism includes a limiting component arranged on the frame and a guiding and sealing component arranged on one side of the limiting component, the limiting component having an abutting surface extending along the production direction; and when the bag body unit passes through the second bottom sealing mechanism, the abutting surface is pressed on the middle support part of the bag body unit, and one side edge is aligned with the bending line of the second bottom surface relative to the middle support part, and the guiding and sealing component guides the second bottom surface to bend relative to the middle support part and be overlapped and fixed on the middle support part and the first bottom surface.

2. The bottom sealing device of the packaging bag according to claim 1, characterized in that: The bottom sealing device further comprises a bag conveying device, which is arranged on the frame and extends from the entrance of the first bottom sealing mechanism to the exit of the second bottom sealing mechanism; and The bag conveying device includes a first conveying portion extending through the first bottom sealing mechanism, a second conveying portion extending through the second bottom sealing mechanism, and a reversing mechanism provided between the first conveying portion and the second conveying portion; wherein, The first conveying part conveys the bag unit along the production direction through the first bottom sealing mechanism in a posture in which the length direction of the bag unit coincides with the production direction. The reversing mechanism changes the posture of the bag unit from the first conveying part so that the length direction of the bag unit is perpendicular to the production direction and conveys the bag unit to the second conveying part. The second conveying part receives the reversed bag unit and conveys the bag unit along the production direction through the second bottom sealing mechanism.

3. The bottom sealing device of the packaging bag according to claim 2, characterized in that: The limiting assembly includes a limiting plate extending along the production direction, and one side of the limiting plate has the abutting surface extending along the horizontal direction; The guiding sealing assembly includes a folding component and a sealing component; wherein, the folding component is arranged on the other side of the limiting plate relative to the bending line in a direction perpendicular to the production direction, and bends the second bottom surface along the bending line, and the sealing component fixes and seals the second bottom surface to the bottom surface.

4. The bottom sealing device of the packaging bag according to claim 3, characterized in that: The folding component is configured as a guide plate extending along the production direction, the guide plate having a guide surface extending in a curved surface relative to the horizontal direction, and an angle between the guide surface and the conveying plane of the second conveying portion gradually decreases along the production direction; The sealing component is configured as a sealing pressure wheel.

5. The bottom sealing device of the packaging bag according to claim 3, characterized in that: The second bottom sealing mechanism also includes a glue spraying component and an air blowing component; wherein, The glue spraying component, the air blowing component, the folding component, and the sealing component are sequentially arranged on the frame along the production direction; wherein, The glue spraying component is arranged at a position corresponding to the inner surface of the second bottom surface, and is used to spray glue on a portion where the second bottom surface overlaps and is fixed to the middle support portion and the first bottom surface; and The air blowing component is arranged on one side of the second bottom surface and blows air toward the corresponding surface of the second bottom surface, so that the second bottom surface smoothly enters the folding component.

6. The bottom sealing device of a packaging bag according to claim 2, characterized in that: The bag conveying device also includes an alignment adjustment mechanism arranged on the frame and located between the reversing mechanism and the limit assembly. The alignment adjustment mechanism drives the bag unit that has been reversed by the reversing mechanism to move in a direction perpendicular to the production direction so that the bending line of the second bottom surface is aligned with one side edge of the abutment surface.

7. The bottom sealing device of a packaging bag according to claim 6, characterized in that: The first conveying part and the second conveying part both include a conveyor belt extending along the production direction, and at least the conveyor belt of the second conveying part has a gap extending along the production direction, and the alignment adjustment mechanism includes a limit baffle, an adjustment wheel and a pressing limit component; wherein, The limiting baffle extends along the production direction and is adjustably arranged on the frame and located on a side corresponding to the bottom wall of the packaging bag; The regulating wheel is rotatably arranged on the frame around the production direction and at least partially protrudes from the gap of the second conveying part in the vertical direction; The pressing and limiting component is connected to the frame in a liftable manner and is located above the adjusting wheel.

8. The bottom sealing device for a packaging bag according to any one of claims 2 to 7, characterized in that: The reversing mechanism includes a corner blocking member, which is arranged at the entrance of the second conveying part and at a position corresponding to a corner of the bottom wall of the packaging bag close to the limiting assembly; wherein, The corner of the bottom wall of the bag unit passing through the entrance of the second conveying part from the first conveying part close to the limiting assembly abuts against the corner blocking member, and the bag unit rotates around the corner blocking member to change to a posture perpendicular to the production direction.

9. The bottom sealing device of a packaging bag according to claim 8, characterized in that: The corner blocking member is configured as an inverted conical blocking rod; and the reversing mechanism further comprises a transfer component, which is movably disposed on the frame, located on one side of the corner blocking member, and closer to the middle position of the entrance of the second conveying part in a direction perpendicular to the production direction; wherein, When a corner portion of one side of the bottom wall of the bag unit abuts against the corner stopper, the transfer member presses the bottom wall of the bag unit and rotates so that the bag unit rotates around the corner stopper.

10. The bottom sealing device of a packaging bag according to claim 9, characterized in that: The reversing mechanism further includes an extrusion conveying wheel provided on the upstream side of the transfer component in the production direction, the extrusion conveying wheel being rotatably connected to the frame, and the transfer component including a lifting member provided on the frame and an extrusion rotating head rotatably connected to the lifting end of the lifting member; wherein, The extrusion conveying wheel rotates to convey the bag unit toward the transfer component along the production direction, the lifting component links the extrusion rotating head to squeeze the bottom wall of the bag unit, and the extrusion rotating head and the bag unit rotate synchronously.

11. The bottom sealing device of a packaging bag according to claim 10, characterized in that: The extrusion conveying wheel is sequentially formed with an arc-shaped extrusion surface and an avoidance gap along its circumference, and the arc length of the arc-shaped extrusion surface is smaller than the length of the bag unit.

12. The bottom sealing device for a packaging bag according to any one of claims 1 to 7, characterized in that: The first bottom sealing mechanism includes a rotating shaft rotatably connected to the frame, a pressing knife and a sealing wheel sequentially arranged on the rotating shaft along the circumference of the rotating shaft; wherein, The rotation of the rotating shaft sequentially links the pressing knife to abut against the bending line of the first bottom surface and the sealing wheel to roll on the first bottom surface.

13. A packaging bag manufacturing device, characterized in that: Including the following arranged in sequence along the production direction: A base material feeding device, the base material feeding device is used to convey the sheet base material to the next station; a barrel-forming device, which receives the base material delivered by the base material supply device and forms the base material into a continuous barrel structure; A sealing device, comprising a drum body, on which a cutting mechanism and a bottom opening mechanism are sequentially arranged along the production direction; the cutting mechanism is used to cut the cylindrical structure received by the sealing device into individual bag units, and the bottom opening mechanism is used to bend the bottom wall of the individual bag unit toward one side of the bag unit to form an intermediate support portion, a first bottom dividing surface and a second bottom dividing surface located along both sides of the intermediate support portion; The bottom sealing device according to any one of claims 1 to 12, wherein the first bottom sealing mechanism is provided on the drum body and is located downstream of the bottom opening assembly along the production direction, and is used to seal the first bottom surface and the second bottom surface to the intermediate support portion respectively; a waste discharge device, the waste discharge device being used to inspect the bag body sealed by the second bottom sealing mechanism and remove waste products; A collecting device is used to collect qualified packaging bags that are not rejected by the waste discharge device.

14. A method for making a packaging bag, characterized in that: The manufacturing equipment for the packaging bag according to claim 13 comprises the following steps: forming a sheet base material into a continuous cylindrical structure; Cutting the continuous cylindrical structure into individual bag units; bending the bottom wall of a single bag unit toward one side of the bag unit; Conveying the bag unit along the production direction with the length direction of the bag unit coinciding with the production direction; sealing the first bottom surface of the bottom wall to the middle supporting portion of the bottom wall; Transforming the posture of the bag unit so that the length direction of the bag unit is perpendicular to the production direction; The second bottom surface of the bottom wall is sealed to the middle supporting portion of the bottom wall.

15. The method for making a packaging bag according to claim 14, wherein: Before sealing the second bottom surface of the bottom wall to the middle supporting portion of the bottom wall, the method further includes: Align the bending line of the second bottom surface in the bag unit with the edge of one side of the abutting surface of the limiting component in the second bottom sealing mechanism.

16. A packaging bag, characterized in that: The packaging bag is manufactured by the manufacturing method according to claim 15, and the packaging bag includes a bag body with a accommodating cavity, the bag body includes a pair of front walls arranged opposite to each other in the thickness direction of the bag body, a pair of side walls arranged opposite to each other in the width direction of the bag body, and a bottom wall arranged at the bottom of the bag body along the height direction of the bag body, and the pair of front walls and the pair of side walls surround the top of the bag body to form a bag opening; wherein, The bottom wall includes a middle support portion, a first bottom sub-surface and a second bottom sub-surface respectively located on both sides of the middle support portion in the thickness direction of the packaging bag; the middle support portion is bent inward relative to the side walls of the packaging bag, the first bottom sub-surface and the second bottom sub-surface are respectively bent toward the middle support portion and fixed to corresponding surfaces of the middle support portion, and opposite ends of the first bottom sub-surface and the second bottom sub-surface are overlapped and fixed to each other; and, The outer wall surface of one of the pair of front walls is a smooth plane, a bending line is formed near the bottom surface of the other front wall, and the other front wall is a smooth plane from the bending line to the bag opening.

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