An aluminum foil sealing device and sealing method

Abstract

This invention discloses an aluminum foil sealing device and method, relating to the field of packaging technology. The aluminum foil sealing device and method include a frame and further include: a forming mold, the forming mold including a mold body with a first concave-convex groove inside the mold body; and a fixed mold assembly, which is close to the forming mold and is used to apply force to the aluminum foil below the forming mold, causing the aluminum foil to form a pleated shape under the action of the mold body, thus reserving a volume compensation space inside the container. This invention, by setting the fixed mold assembly to apply force to the aluminum foil below the forming mold, causes the aluminum foil to conform to the first concave-convex groove and form a pleated shape under the action of the mold body. Simultaneously, a descending hot-pressing ring heats and presses the aluminum foil under the pressure ring, completing the sealing. The pleated portion, as a deformable volume space, is adapted to the volume changes caused by the generation of trace gases during the storage of health products containing active ingredients, reserving a volume compensation space inside the container and preventing damage to the aluminum foil sealing surface due to pressure changes inside the container.

Description

Technical Field

[0001] This invention relates to the field of packaging technology, specifically to an aluminum foil sealing device and sealing method. Background Technology

[0002] Aluminum foil is a thin sheet material made primarily from metallic aluminum through a rolling process. The petroleum industry chain provides energy and raw materials for aluminum foil production.

[0003] Aluminum foil sealing technology is widely used in the packaging of food, pharmaceuticals, cosmetics, and health products. It uses heat pressing to firmly seal aluminum foil to the container opening, blocking oxygen, moisture, light, and microorganisms, thus ensuring the quality and shelf life of the contents. This is especially important for health products containing probiotics, enzymes, and other active ingredients, as the contents may undergo weak biochemical reactions during storage, producing trace amounts of gas and causing slow pressure changes inside the container. In traditional aluminum foil sealing processes, the aluminum foil is typically heat-pressed flat onto the container opening, creating a fixed sealed space with little room for deformation. When the pressure inside the container increases due to gas production or temperature changes, the internal pressure acts directly on the flat aluminum foil sealing surface, easily causing the foil to bulge and deform. Over time, this can lead to fatigue of the hot melt adhesive layer, micro-cracks or even rupture of the sealing surface, resulting in seal failure, deterioration of the contents, or loss of activity.

[0004] In existing technologies, although some sealing equipment attempts to improve sealing quality, such as by optimizing hot pressing parameters, improving adhesive materials, or increasing the pressing and holding time, these methods mainly focus on improving the initial bonding strength and do not fundamentally solve the pressure balance problem caused by the dynamic changes in the internal volume of the container. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an aluminum foil sealing device and sealing method, which solves the problem of air leakage at the sealing edge caused by aluminum foil bulging.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an aluminum foil sealing device, comprising a frame, and further comprising: A molding die, the molding die including a die body, the die body having a first groove inside; A fixed mold assembly is located near the forming mold and is used to apply force to the aluminum foil below the forming mold, so that the aluminum foil forms a fold shape under the action of the mold body, thus reserving volume compensation space inside the container. The molding die also includes a pressure ring located at the lower outer edge of the die body. A hot-pressing ring is also provided in the upper part of the frame. The hot-pressing ring can descend to apply pressure to the pressure ring, so that the aluminum foil in the area of ​​the pressure ring seals the container.

[0007] Furthermore, the fixed mold assembly includes a first chamber, the first groove divides the mold body into an upper first chamber and a lower molding space, the first groove is provided with a first air hole connecting the first chamber and the molding space, and the mold body is provided with a first air pipe communicating with the first chamber. Gas is drawn through the first duct to generate negative pressure, causing the aluminum foil to be adsorbed by the negative pressure and stick to the surface of the first groove to form a wrinkle.

[0008] Furthermore, a support plate two is fixed to the top plate of the frame via a connecting rod two; Also includes: Pressure plate two, the hot pressing ring is fixed on pressure plate two by connecting rod one, cylinder two is provided on the frame, and the piston rod end of cylinder two is fixedly connected to pressure plate two; Guide rod one, the guide rod one is fixed to the upper surface of the forming mold, the upper end of the guide rod one passes through the support plate two and is slidably connected to the support plate one, the part of the guide rod one located between the support plate two and the support plate one, and a spring one is sleeved on its outer surface.

[0009] Furthermore, the mold-fixing component includes: The lower mold has a second groove on its upper surface that mates with the first groove. Through the squeezing action of the second groove and the first groove, force is applied to the aluminum foil to press it into a pleated shape. The second chamber is located inside the lower mold. The second chamber is connected to the second groove through a second air hole. The lower surface of the lower mold is provided with a second air pipe that communicates with the second chamber. Positive pressure is formed by blowing air through the second air pipe, which facilitates the separation of the aluminum foil from the second groove.

[0010] Furthermore, the frame is provided with a die-cutting channel and a sealing channel, and forming molds are respectively provided on the die-cutting channel and the sealing channel; A turntable is provided in the middle of the upper surface of the frame, and two forming molds are installed on both sides of the turntable. The turntable rotates 180° so that the two forming molds can alternate on the die-cutting channel and the sealing channel.

[0011] Furthermore, cylinder four and cylinder three are respectively provided on the die-cutting channel and the sealing channel; A pressure plate is fixedly connected to the piston rod end of the cylinder. A guide rod is slidably arranged on the pressure plate. A push plate is fixed at the lower end of the guide rod. The push plate is positioned corresponding to the mold body. A spring is sleeved on the outer surface of the guide rod. The piston rod end of the cylinder is fixedly connected to a pressure plate, and a guide rod is slidably arranged on the pressure plate. The lower end of the guide rod is connected to a hot-pressing ring, and a spring is sleeved on the outer surface of the guide rod.

[0012] Furthermore, it also includes a lifting mechanism, which comprises: The mounting hoop is located outside the pressure ring, and a connecting bracket is provided at the interface of the mounting hoop. A slider is fixed on the other side of the connecting bracket. Slide rail one is fixed to both sides of the lower surface of the turntable. Slide rail one is provided with guide rod three inside. Slider one can slide inside slide rail one. Spring three is sleeved on the outside of guide rod three.

[0013] Furthermore, it also includes an unwinding mechanism, which includes aluminum foil rolls and take-up rollers located on both sides of the top plate of the frame, and a motor capable of driving the take-up roller to rotate is provided on one side of the take-up roller. Two guide rollers are installed on the frame, located on both sides of the forming mold, so that the aluminum foil is placed horizontally on the lower surface of the forming mold.

[0014] Furthermore, it also includes a positioning mechanism, which includes a positioning plate with a positioning groove, two slide rails on both sides of the positioning plate, and the positioning plate can slide on the slide rails. A cylinder is installed on the upper surface of the frame, and the piston rod end of the cylinder is fixedly connected to the positioning plate.

[0015] On the other hand, the present invention also provides a method for sealing aluminum foil, comprising the following steps: In the die-cutting stage, the flattened aluminum foil is conveyed to the lower surface of the forming mold. The fixed mold assembly cooperates with the first groove to form a pleated shape of the aluminum foil. The forming mold descends so that the pressure ring can die-cut the aluminum foil and form a single pleated aluminum foil. During the sealing stage, a single sheet of aluminum foil is placed over the opening of the container to be sealed. The hot-pressing ring descends and melts the hot melt adhesive layer of the aluminum foil and impregnates the sealing surface of the container through constant temperature hot pressing and pressure holding, thus achieving the bonding between the aluminum foil and the container.

[0016] The present invention has the following beneficial effects: 1. The aluminum foil sealing device and method apply force to the aluminum foil below the forming mold by setting a fixed mold assembly, so that the aluminum foil adheres to the first concave and convex groove under the action of the mold body to form a pleated shape. At the same time, the hot pressure ring descends to heat and press the aluminum foil under the pressure ring to complete the sealing. The pleated part serves as a deformable volume space to accommodate the volume changes caused by the generation of trace gases during the storage of health products containing active ingredients. It provides a volume compensation space inside the container and avoids damage to the aluminum foil sealing surface caused by pressure changes inside the container.

[0017] 2. The aluminum foil sealing device and sealing method use a first air pipe to draw gas and create negative pressure in the forming space of the lower layer of the mold, causing the aluminum foil to be adsorbed by the negative pressure and stick to the surface of the first groove to form a wrinkle.

[0018] 3. The aluminum foil sealing device and sealing method are equipped with a lower mold. The mold body descends and the lower mold closes and squeezes the aluminum foil, which is then pressed into a pleated shape by the action of the first and second grooves. The mold closing and squeezing has a better shaping effect.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] Figure 1 This is an overall diagram of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the unwinding mechanism and forming mold according to Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the molding die and hot-pressing ring installation according to Embodiment 1 of the present invention; Figure 4 This is an exploded view of the molding die and hot-pressing ring assembly according to Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the unwinding mechanism according to Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the positioning mechanism of the present invention; Figure 7 This is a cross-sectional view of the molding die of the present invention; Figure 8 This is an overall diagram of Embodiment 2 of the present invention; Figure 9 This is a front view of Embodiment 2 of the present invention; Figure 10 This is a schematic diagram of the installation of the turntable, forming mold, and hot-pressing ring in Embodiment 2 of the present invention; Figure 11 This is a schematic diagram of the installation of the molding die, turntable, and lifting mechanism in Embodiment 2 of the present invention; Figure 12 This is a schematic diagram of the unwinding mechanism and forming mold according to Embodiment 2 of the present invention; Figure 13 This is an exploded view of the lifting mechanism installation according to Embodiment 2 of the present invention; Figure 14 This is a cross-sectional view of the lower mold in Embodiment 2 of the present invention.

[0021] In the diagram, 1. Die-cutting channel; 2. Sealing channel; 3. Forming mold; 31. Mold body; 32. Pressure ring; 33. First groove; 41. First chamber; 42. First air hole; 43. First air pipe; 44. Lower mold; 45. Second groove; 46. Second chamber; 47. Second air hole; 48. Second air pipe; 51. Support plate one; 52. Guide rod one; 53. Spring one; 54. Pressure plate one; 55. Guide rod two; 56. Spring two; 57. Push plate; 6. Unwinding mechanism; 61. Aluminum foil roll; 62. Rewinding roller; 63. Guide roller; 65. Motor one; 7. 1. Turntable; 72. Rotating shaft; 73. Motor II; 8. Lifting mechanism; 81. Mounting hoop; 82. Connecting frame; 83. Slider I; 84. Slide rail I; 85. Guide rod III; 86. Spring III; 9. Positioning mechanism; 91. Positioning plate; 92. Slide rail II; 93. Cylinder I; 10. Hot-pressing ring; 101. Connecting rod I; 102. Pressure plate II; 103. Pressure plate III; 104. Guide rod IV; 105. Spring IV; 11. Aluminum foil; 12. Frame; 121. Connecting rod II; 122. Support plate II; 13. Cylinder II; 14. Cylinder III; 15. Cylinder IV. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0024] The following is based on Figures 1-14 This invention describes the aluminum foil sealing device and sealing method provided in the embodiments of the present invention.

[0025] On one hand, embodiments of the present invention provide an aluminum foil sealing device.

[0026] Example 1: Please refer to Figures 1-4 and Figure 7The aluminum foil sealing device includes a forming mold 3 and a fixed mold assembly. The forming mold 3 includes a mold body 31, and the mold body 31 has a first groove 33 inside. The fixed mold assembly is close to the forming mold 3 and is used to apply force to the aluminum foil 11 below the forming mold 3, so that the aluminum foil 11 forms a pleated shape under the action of the mold body 31. The pleated part serves as a deformable volume space, which is adapted to the volume change caused by the generation of trace gases during the storage of health products containing active ingredients such as probiotics and enzymes. It reserves volume compensation space inside the container and avoids damage to the sealing surface of the aluminum foil 11 caused by pressure changes inside the container.

[0027] Furthermore, to facilitate the sealing of the container by the aluminum foil 11, the forming mold 3 is also provided with a pressure ring 32. The pressure ring 32 is located on the lower outer edge of the mold body 31. The pressure ring 32 can die-cut the aluminum foil 11, and its contact surface with the aluminum foil 11 is flat, so that the aluminum foil 11 can fit tightly against the container opening when sealing. A hot pressing ring 10 is also provided in the upper part of the frame 12. The hot pressing ring 10 can descend to hot press the pressure ring 32. The constant temperature hot pressing melts the hot melt adhesive layer on the aluminum foil 11. The pressure makes the melted hot melt adhesive wet the sealing surface of the container opening, while expelling the air between the aluminum foil 11 and the container opening to avoid the formation of air bubbles on the sealing surface. Then, while maintaining the working pressure, the hot pressing ring 10 pushes the pressure ring 32 to continue to adhere to the aluminum foil 11, so that the melted hot melt adhesive adheres to the sealing surface of the container to form a sealing layer, preventing the hot melt adhesive from rebounding after pressure relief and causing a sealing gap, thus completing the sealing of the container by the aluminum foil 11.

[0028] Specifically, the pressure ring 32 is made of a heat-conducting material, the mold body 31 is made of a heat-insulating material, and there is a gap between the hot pressure ring 10 and the mold body 31, so that the hot pressure ring 10 only acts on the aluminum foil 11 under the pressure ring 32.

[0029] Please refer to Figure 7 To facilitate the formation of folds in the middle of the aluminum foil 11, the fixed mold assembly includes a first chamber 41. A first groove 33 divides the mold body 31 into an upper first chamber 41 and a lower forming space. The first groove 33 is provided with a first air hole 42 that connects the first chamber 41 and the forming space. The mold body 31 is provided with a first air pipe 43 that connects to the first chamber 41. Gas is drawn out through the first air pipe 43 to generate negative pressure, so that the aluminum foil 11 is adsorbed by the negative pressure and sticks to the surface of the first groove 33 to form a fold.

[0030] Please refer to Figure 3 and Figure 4 It also includes a frame 12, on which a support plate 122 is fixed via a connecting rod 121, together forming a fixed mounting frame.

[0031] In order to lower the hot-pressing ring 10, a pressure plate 2 102 is provided. The hot-pressing ring 10 is fixed on the pressure plate 2 102 by a connecting rod 101. A cylinder 2 13 is provided on the frame 12. The piston rod end of the cylinder 2 13 is fixedly connected to the pressure plate 2 102. When the cylinder 2 13 is activated, it pushes the pressure plate 2 102 to lower, thereby pushing the hot-pressing ring 10 to lower.

[0032] Furthermore, in order to achieve the descent of the molding mold 3, a guide rod 52 is provided. The guide rod 52 is fixed to the upper surface of the molding mold 3. The upper end of the guide rod 52 passes through the support plate 122 and is slidably connected to the support plate 51. The part of the guide rod 52 located between the support plate 122 and the support plate 51 has a spring 53 sleeved on its outer surface. When the hot pressing ring 10 descends, it applies pressure to the pressure ring 32. The guide rod 52 pulls the support plate 51 down, and then the spring 53 contracts. The molding mold 3 descends synchronously with the hot pressing ring 10.

[0033] Specifically, the support plate 51 and the cylinder 13 are in clearance fit.

[0034] Please refer to Figure 2 and Figure 5 To facilitate the stable transport of aluminum foil 11, an unwinding mechanism 6 is also provided. The unwinding mechanism 6 includes aluminum foil rolls 61 and take-up rollers 62 located on both sides of the top plate of the frame 12. A motor 65 is provided on one side of the take-up roller 62 to drive it to rotate. The motor 65 drives the take-up roller 62 to rotate to stabilize the unwinding tension, so that the aluminum foil 11 film on the aluminum foil roll 61 is transported to the bottom of the forming mold 3. The waste material after cutting is recycled by the take-up roller 62. Two guide rollers 63 are installed on the frame 12, located on both sides of the forming mold 3, to eliminate wrinkles in the aluminum foil 11, ensure that the aluminum foil 11 is flat during the transport process, without loosening or stretching deformation, and is placed on the lower surface of the forming mold 3.

[0035] Please refer to Figure 1 and Figure 6 To facilitate positioning during container sealing, a positioning mechanism 9 is also provided. The positioning mechanism 9 includes a positioning plate 91 with a positioning groove for positioning the container. The positioning plate 91 has slide rails 92 on both sides, and the positioning plate 91 can slide on the slide rails 92. The slide rails 92 are fixed on the frame 12. A cylinder 93 is installed on the upper surface of the frame 12. The piston rod end of the cylinder 93 is fixed to the positioning plate 91. Before and after sealing, the cylinder pushes the positioning plate 91 to slide on the slide rails 92, thereby pulling the container on the positioning plate 91 to move.

[0036] Specifically, when the sealing workload is large, a conveyor belt and its clamping components can be set up to continuously position the container, making the sealing process a production line operation and improving the overall production efficiency of aluminum foil sealing.

[0037] In use, the container is placed in the positioning groove of the positioning plate 91, and the cylinder 93 pushes the positioning plate 91 to slide on the slide rail 92, thereby pulling the container on the positioning plate 91 to move directly below the forming mold 3. The first air pipe 43 draws gas and generates negative pressure on the forming space of the lower layer of the mold body 31 through the first chamber 41 and the first air hole 42, so that the aluminum foil 11 is attracted by the negative pressure and sticks to the surface of the first groove 33 to form a wrinkle. The starting cylinder 13 pushes the hot-pressing ring 10 down to apply pressure to the pressure ring 32, causing the molding die 3 to descend synchronously with the hot-pressing ring 10 until it contacts the sealing surface of the container opening. The hot-pressing ring 10, through the pressure ring 32, heats and presses the aluminum foil 11 on the sealing surface. The constant-temperature hot pressing melts the hot melt adhesive layer on the aluminum foil 11. The pressure causes the molten hot melt adhesive to wet the sealing surface of the container opening, while simultaneously expelling air between the aluminum foil 11 and the container opening, preventing air bubbles from forming on the sealing surface. Maintaining a constant working pressure, the hot-pressing ring 10 pushes the pressure ring 32 to continue to adhere to the aluminum foil 11, allowing the molten hot melt adhesive to bond with the container sealing surface, forming a sealing layer. This prevents the hot melt adhesive from rebounding after pressure release, thus completing the sealing of the container with the aluminum foil 11. The pleated part, as a deformable volume space, is adapted to accommodate the volume changes caused by the generation of trace gases during the storage of health products containing probiotics, enzymes, and other active ingredients. It provides a volume compensation space inside the container, preventing damage to the sealing surface of the aluminum foil 11 due to pressure changes inside the container. Cylinder 93 pushes positioning plate 91 to move the sealed container away from molding mold 3, making it easier to remove the container.

[0038] Example 2: Please refer to Figures 8-12 and Figure 13 The difference between this embodiment and the first embodiment lies in the fixed mold assembly. Here, the fixed mold assembly is provided with a lower mold 44. The upper surface of the lower mold 44 is provided with a second groove 45 that cooperates with the first groove 33. The mold body 31, the first groove 33 and the second groove 45 of the lower mold 44 are the forming base. The mold extrusion applies force to the aluminum foil 11 to press it into a pleated shape. The mold extrusion makes the aluminum foil 11 better shaped.

[0039] Furthermore, in order to facilitate the separation of the aluminum foil 11 from the second groove 45, the second chamber 46 is located inside the lower mold 44. The second chamber 46 and the second groove 45 are connected by the second air hole 47. The lower surface of the lower mold 44 is provided with a second air pipe 48 that is connected to the second chamber 46. After forming, positive pressure can be formed by blowing air through the second air pipe 48. The pushing force of the positive pressure airflow is used to separate the formed aluminum foil 11 from the lower mold 44 and attach it to the mold body 31, thereby achieving temporary bonding and positioning of the aluminum foil and the mold.

[0040] Please refer to Figures 9-12The frame 12 is provided with a die-cutting channel 1 and a sealing channel 2. A forming mold 3 is provided on the die-cutting channel 1 and the sealing channel 2 respectively. A turntable 71 is provided in the middle of the upper surface of the frame 12. The two forming molds 3 are installed on both sides of the turntable 71. The turntable 71 rotates 180° so that the two forming molds 3 can take turns on the die-cutting channel 1 and the sealing channel 2, and participate in the die-cutting and sealing work without interruption.

[0041] Furthermore, a rotating shaft 72 is fixed in the middle of the lower surface of the turntable 71. The rotating shaft 72 is rotatably mounted on the frame 12. The second motor 73 is installed inside the frame 12. The second motor 73 drives the rotating shaft 72 to rotate, so that the turntable 71 can rotate 180°.

[0042] Specifically, the lower die 44 and the unwinding mechanism 6 are located on the die-cutting channel 1, and the positioning mechanism 9 is located on the sealing channel 2.

[0043] Please refer to Figures 8-10 Cylinder 4 15 and Cylinder 3 14 are respectively installed on the die-cutting channel 1 and the sealing channel 2.

[0044] To facilitate the descent of the forming mold 3 during die cutting, a pressure plate 54 is fixedly connected to the piston rod end of cylinder 4 15. A guide rod 55 is slidably mounted on the pressure plate 54, and a push plate 57 is fixed to the lower end of the guide rod 55. The push plate 57 corresponds to the position of the mold body 31. When cylinder 4 15 is activated, it pushes the pressure plate 54 to descend, which in turn pushes the push plate 57 to descend via the guide rod 55, applying pressure to the forming mold 3. A spring 56 is sleeved on the outer surface of the guide rod 55. As the pressure plate 54 continues to descend and apply pressure to the forming mold 3, the spring 56 contracts, the elastic force increases linearly, and the pressure is steadily increased to the die cutting pressure, achieving a smooth transition from low to high pressure and maintaining mold closing accuracy.

[0045] To achieve the descent of the hot-pressing ring 10 in the sealed state, a pressure plate 103 is fixedly connected to the piston rod end of cylinder 3 14. A guide rod 104 is slidably mounted on the pressure plate 3 103. The lower end of the guide rod 104 is connected to the hot-pressing ring 10. When cylinder 3 14 is activated, it pushes the pressure plate 103 to descend, which in turn pushes the hot-pressing ring 10 to descend through the guide rod 104. A spring 105 is sleeved on the outer surface of the guide rod 104. As the hot-pressing ring 10 continues to descend, it applies pressure to the pressure ring 32, causing the spring 105 to contract. The pressure is steadily increased to the set working pressure, achieving a smooth transition from low to high pressure. This allows the hot melt adhesive layer to gradually melt and wet the container opening as the pressure increases, preventing the aluminum foil 11 from shifting or bulging due to sudden pressure changes.

[0046] It should be noted that the die-cutting and hot pressing are performed simultaneously.

[0047] Preferably, cylinder 15 and cylinder 14 are respectively provided on the die-cutting channel 1 and the sealing channel 2. It is also possible to control the descent of the forming mold 3 in the die-cutting state and the descent of the hot pressing ring 10 in the sealing state with a single cylinder, but the accuracy is relatively low.

[0048] Furthermore, such as Figure 11 and Figure 13 To enable the molding die 3 to move freely in the longitudinal direction, a lifting mechanism 8 is provided. The lifting mechanism 8 includes a mounting hoop 81 and a slide rail 84. The mounting hoop 81 is located outside the pressure ring 32. A connecting frame 82 is provided at the interface of the mounting hoop 81. A slider 83 is fixed on the other side of the connecting frame 82. The slide rail 84 is fixed on both sides of the lower surface of the turntable 71. A guide rod 85 is provided inside the slide rail 84. The slider 83 can slide inside the slide rail 84. A spring 86 is sleeved on the outside of the guide rod 85. When the molding die 3 is under pressure, the spring 86 contracts. When the pressure is removed, the spring 86 extends and pushes the molding die 3 to reset.

[0049] In use, in die-cutting channel 1, cylinder 4 15 pushes pressure plate 1 54, causing push plate 57 to descend and apply pressure to forming mold 3. The mold body 31 and the first and second grooves 33 and 45 of the lower mold 44 form the forming base. The mold body 31 and the lower mold 44 close and squeeze, applying force to the aluminum foil 11 to press it into a pleated shape. After forming, the second air pipe 48 blows air, forming positive pressure on the aluminum foil 11 through the second chamber 46 and the second air hole 47. Using the pushing force of the positive pressure airflow, the formed aluminum foil 11 separates from the lower mold 44 and adheres to the mold body 31, realizing the temporary adhesion and positioning of the aluminum foil and the mold. After die-cutting is completed, motor 2 73 drives turntable 71 to rotate 180°, causing the forming mold 3 in die-cutting channel 1 to rotate onto sealing channel 2. In sealing channel 2, cylinder 3 14 pushes pressure plate 3 103, causing hot pressing ring 10 to descend and hot press the pressure ring 32, so that the aluminum foil 11 seals the container. After sealing is completed, the sealed container is removed by the positioning mechanism 9 and then placed into the container to be sealed, so that it can participate in the next round of sealing work.

[0050] On the other hand, embodiments of the present invention also provide an aluminum foil sealing method, comprising the following steps: During the die-cutting stage, the flattened aluminum foil 11 is conveyed to the lower surface of the forming mold 3. The fixed mold assembly cooperates with the first groove 33 to form a pleated shape of the aluminum foil 11. The forming mold 3 descends so that the pressure ring 32 can die-cut the aluminum foil 11 and form a single pleated aluminum foil 11. During the sealing stage, a single aluminum foil 11 is placed over the opening of the container to be sealed. The hot pressing ring 10 descends and melts the hot melt adhesive layer of the aluminum foil 11 and wets the sealing surface of the container through constant temperature hot pressing and pressure holding, thereby achieving the bonding between the aluminum foil 11 and the container.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0052] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An aluminum foil sealing device, comprising a frame (12), characterized in that, Also includes: A molding die (3) includes a die body (31) and a first groove (33) is provided inside the die body (31). The fixed mold assembly is close to the forming mold (3) and is used to apply force to the aluminum foil (11) below the forming mold (3) so that the aluminum foil (11) forms a pleated shape under the action of the mold body (31) to reserve volume compensation space inside the container. The molding die (3) also includes a pressure ring (32), which is located on the outer edge below the die body (31). A hot pressing ring (10) is also provided inside the frame (12). The hot pressing ring (10) can descend to apply pressure to the pressure ring (32) so that the aluminum foil (11) in the area of ​​the pressure ring (32) seals the container.

2. The aluminum foil sealing device according to claim 1, characterized in that, The fixed mold assembly includes a first chamber (41), and the first groove (33) divides the mold body (31) into an upper first chamber (41) and a lower molding space. The first groove (33) is provided with a first air hole (42) that connects the first chamber (41) and the molding space. The mold body (31) is provided with a first air pipe (43) that communicates with the first chamber (41). Gas is drawn through the first air tube (43) to generate negative pressure, causing the aluminum foil (11) to be adsorbed by the negative pressure and stick to the surface of the first groove (33) to form a wrinkle.

3. The aluminum foil sealing device according to claim 2, characterized in that, The top plate of the frame (12) is fixed with a support plate (122) by a connecting rod (121); Also includes: Pressure plate two (102), the hot pressing ring (10) is fixed on pressure plate two (102) by connecting rod one (101), and cylinder two (13) is provided on the frame (12), the piston rod end of cylinder two (13) is fixedly connected to pressure plate two (102); Guide rod 1 (52) is fixed on the upper surface of the molding mold (3). The upper end of guide rod 1 (52) passes through support plate 2 (122) and is slidably connected to support plate 1 (51). The part of guide rod 1 (52) located between support plate 2 (122) and support plate 1 (51) has spring 1 (53) sleeved on its outer surface.

4. The aluminum foil sealing device according to claim 1, characterized in that, The mold assembly includes: The lower mold (44) has a second groove (45) on its upper surface that cooperates with the first groove (33). Through the mold pressing action of the second groove (45) and the first groove (33), force is applied to the aluminum foil (11) to press it into a pleated shape. The second chamber (46) is located inside the lower mold (44). The second chamber (46) and the second groove (45) are connected by a second air hole (47). The lower surface of the lower mold (44) is provided with a second air pipe (48) that is connected to the second chamber (46). Positive pressure is formed by blowing air through the second air pipe (48), which facilitates the separation of the aluminum foil (11) from the second groove (45).

5. The aluminum foil sealing device according to claim 4, characterized in that, The frame (12) is provided with a die-cutting channel (1) and a sealing channel (2), and forming molds (3) are respectively provided on the die-cutting channel (1) and the sealing channel (2); The upper surface of the frame (12) is provided with a turntable (71), and two forming molds (3) are installed on both sides of the turntable (71). The turntable (71) rotates 180° so that the two forming molds (3) can alternate on the die-cutting channel (1) and the sealing channel (2).

6. The aluminum foil sealing device according to claim 5, characterized in that, The die-cutting channel (1) and sealing channel (2) are respectively equipped with cylinder four (15) and cylinder three (14); The piston rod end of the cylinder four (15) is fixedly connected to a pressure plate one (54), and a guide rod two (55) is slidably arranged on the pressure plate one (54). A push plate (57) is fixed at the lower end of the guide rod two (55). The push plate (57) corresponds to the position of the mold body (31). A spring two (56) is sleeved on the outer surface of the guide rod two (55). The piston rod end of the cylinder three (14) is fixedly connected to the pressure plate three (103), and the pressure plate three (103) is slidably provided with the guide rod four (104). The lower end of the guide rod four (104) is connected to the hot pressure ring (10), and the outer surface of the guide rod four (104) is sleeved with the spring four (105).

7. The aluminum foil sealing device according to claim 5, characterized in that, It also includes a lifting mechanism (8), which includes: Mounting hoop (81), the mounting hoop (81) is located outside the pressure ring (32), and a connecting frame (82) is provided at the interface of the mounting hoop (81). A slider (83) is fixed on the other side of the connecting frame (82). Slide rail 1 (84) is fixed on both sides of the lower surface of turntable (71). Slide rail 1 (84) is provided with guide rod 3 (85) inside. Slider 1 (83) can slide inside slide rail 1 (84). Spring 3 (86) is sleeved on the outside of guide rod 3 (85).

8. An aluminum foil sealing device according to any one of claims 1-7, characterized in that, It also includes an unwinding mechanism (6), which includes aluminum foil rolls (61) and take-up rollers (62) located on both sides of the top plate of the frame (12). A motor (65) capable of driving the take-up roller (62) to rotate is provided on one side of the take-up roller (62). Two guide rollers (63) are installed on the frame (12), located on both sides of the forming mold (3), so that the aluminum foil (11) is placed horizontally on the lower surface of the forming mold (3).

9. An aluminum foil sealing device according to any one of claims 1-7, characterized in that, It also includes a positioning mechanism (9), which includes a positioning plate (91) with a positioning groove, and two slide rails (92) on both sides of the positioning plate (91). The positioning plate (91) can slide on the slide rails (92). A cylinder (93) is installed on the upper surface of the frame (12). The piston rod end of the cylinder (93) is fixedly connected to the positioning plate (91).

10. A method for sealing aluminum foil, applicable to the aluminum foil sealing device according to any one of claims 1-9, characterized in that, Includes the following steps: During the die-cutting stage, the flattened aluminum foil (11) is conveyed to the lower surface of the forming mold (3). The fixed mold assembly cooperates with the first groove (33) to form a pleated shape of the aluminum foil (11). The forming mold (3) descends so that the pressure ring (32) can die-cut the aluminum foil (11) and form a single pleated aluminum foil (11). During the sealing stage, a single aluminum foil (11) is placed over the opening of the container to be sealed. The hot pressing ring (10) descends and melts the hot melt adhesive layer of the aluminum foil (11) and wets the sealing surface of the container through constant temperature hot pressing and pressure setting, thereby achieving the bonding between the aluminum foil (11) and the container.

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