Positioning bonding lifting type resealing sealing gasket

Abstract

The invention discloses a positioning bonding lifting type resealing sealing gasket which comprises a sealing layer, an aluminum foil layer and a foaming layer, the sealing layer is compounded on the lower surface of the aluminum foil layer through a first glue layer, the sealing gasket is characterized in that an annular cutting line is arranged on the foaming layer in a die cutting mode, and an opening part is formed in the area surrounded by the annular cutting line; the lower surface of the foaming layer is compounded on the upper surface of the aluminum foil layer through a second glue layer; a lifting layer is further included, the lifting layer comprises a positioning bonding part and a lifting part located on the periphery of the positioning bonding part, the positioning bonding part is bonded with the corresponding position of the opening part, and the lower surface of the lifting part is not attached to other parts of the upper surface of the foaming layer. According to the positioning bonding lifting type resealing sealing gasket, the lifting layer is independently arranged, tension is evenly dispersed, stress concentration is avoided, and it is guaranteed that the lifting process is stable and reliable.

Description

Technical Field

[0001] This invention relates to a sealing gasket, and more particularly to a positioning, adhesive, pull-up resealing sealing gasket. Background Technology

[0002] Current packaging containers include plastic containers, paper containers, or aluminum containers. These packaging containers have an opening at the top, and a sealing edge is provided at the edge of the opening. A sealing gasket is heat-sealed onto the sealing edge to ensure that the packaging container is sealed and preserved.

[0003] Existing sealing gasket structures, such as the utility model patent with publication number CN219970594U, disclose a peripherally heat-sealed sealing gasket with a pull ring, including an upper sealing layer and a lower sealing layer. The upper sealing layer has a pull ring, an annular cut line, and a strip cut line in the middle. The pull ring is located within the area enclosed by the annular cut line, and the annular cut line and the pull ring are connected by the strip cut line. The lower sealing layer includes an aluminum foil layer and a sealing layer laminated to the lower surface of the aluminum foil layer. The sealing gasket also includes a heat-sealing layer, and the area of ​​the upper sealing layer excluding the pull ring is heat-sealed to the corresponding area of ​​the lower sealing layer through the heat-sealing layer. The upper sealing layer includes a double-sided laminated foam layer, and the heat-sealing layer includes a first heat-sealing layer laminated to the lower surface of the double-sided laminated foam layer and a second heat-sealing layer laminated to the upper surface of the aluminum foil layer. The double-sided laminated foam layer includes a foam layer and a first and a second thin film layer laminated to both sides of the foam layer. When tearing open the sealing gasket, you need to pull the pull ring upwards by hand. The pull ring will tear the aluminum foil layer along the strip tear line and the ring cut line.

[0004] When the pull ring is pulled up, the narrower width of its root (where it connects to the strip or ring cut line) makes it prone to stress concentration and breakage, causing the pull ring to lose its grip and fail to open. Furthermore, the pull ring is also part of the upper sealing layer, and its layered structure includes a foam layer and a first and second thin film layer laminated on both sides of the foam layer. During the pull ring's multi-layered structure, the stress initially concentrated at the root becomes unevenly dispersed due to the different deformations of the multiple materials, resulting in localized stress superposition. Even if the root width meets the design specifications, the tensile force from the coordinated tearing of the multiple materials can easily cause the root film to rupture, the foam layer to peel off, and ultimately, the pull ring to fail. Summary of the Invention

[0005] The problem to be solved by the present invention is to provide a positioning adhesive pull-up resealing gasket. This positioning adhesive pull-up resealing gasket has an independently set pull-up layer, the pull force is evenly distributed, stress concentration is avoided, and the pull-up process is stable and reliable.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A positioning adhesive pull-up resealing gasket includes a sealing layer, an aluminum foil layer, and a foam layer. The sealing layer is bonded to the lower surface of the aluminum foil layer by a first adhesive layer. The foam layer is characterized by having an annular cut line die-cut into it, the area enclosed by the annular cut line forming an opening. The lower surface of the foam layer is bonded to the upper surface of the aluminum foil layer by a second adhesive layer. The gasket also includes a pull-up layer, comprising a positioning adhesive portion and a pull-up portion located on the outer periphery of the positioning adhesive portion. The positioning adhesive portion is bonded to a corresponding position of the opening, and the lower surface of the pull-up portion is not in contact with the remaining portion of the upper surface of the foam layer.

[0007] The aforementioned positioning adhesive pull-up resealable gasket is generally heat-sealed onto the opening of the packaging container, that is, the lower surface edge of the sealing layer is heat-sealed and fixed to the opening of the packaging container.

[0008] When the sealing gasket is to be opened, the lifting layer is only partially heat-sealed to the upper surface of the foam layer through the positioning adhesive part. The lower surface of the lifting part is not adhered or bonded to the rest of the upper surface of the foam layer, naturally forming a lifting gap that can be easily hooked up. The user can easily hook the edge of the lifting part with just their fingers, pinch the lifting part and apply upward force. The pulling force is transmitted to the opening of the foam layer through the positioning adhesive part, precisely tearing the foam layer, aluminum foil layer and sealing layer along the preset annular cutting line, exposing the opening of the foam layer. The remaining part of the foam layer still adheres completely to the sealing edge of the packaging container, maintaining the original sealing performance.

[0009] In the preferred embodiment, the positioning adhesive portion is circular, elliptical, or triangular in shape, and the shape of the opening matches the shape of the positioning adhesive portion. The positioning adhesive portion is located at any position on the lifting layer. The position of the positioning adhesive portion can be adjusted according to the shape of the packaging container, the position of the flow outlet, and the user's handling habits, improving design flexibility and usability. These shapes of the positioning adhesive portion are common heat-sealing shapes used in industrial production. The molds are simple to make, the processing precision is easy to control, and it can adapt to different usage habits and product types. Of course, the shape of the positioning adhesive portion can also be other smooth-edged, easy-to-tear shapes.

[0010] In a preferred embodiment, when the shape of the positioning adhesive portion does not match the shape of the opening portion, the area of ​​the positioning adhesive portion is smaller than the area of ​​the opening portion.

[0011] In a further preferred embodiment, the positioning adhesive portion is strip-shaped, and the opening is circular. The strip-shaped positioning adhesive portion is located at the center of the opening. Along the length of the strip-shaped positioning adhesive portion, both ends are connected to the annular cutting line. The lifting portion is lifted upwards, and the foam layer bonded to one end of the strip-shaped positioning adhesive portion is first torn open. Then, the tearing path is guided along the annular cutting line to the other end of the strip-shaped positioning adhesive portion, tearing off the foam layer corresponding to the opening to expose the opening.

[0012] In a second, further preferred embodiment, the positioning adhesive portion is circular in shape, the opening is circular in shape, and the foam layer is further provided with an arc-shaped cutting line. The arc-shaped cutting line is located between the annular cutting line and the positioning adhesive portion, with its inner end connected to the edge of the positioning adhesive portion and its outer end connected to the annular cutting line. The lifting portion is lifted upwards, first tearing the foam layer bonded to the positioning adhesive portion, then guiding the tearing path along the arc-shaped cutting line to the annular cutting line, tearing away the foam layer corresponding to the opening to expose the opening.

[0013] In a third, further preferred embodiment, the positioning adhesive portion is shaped like two circles, the opening is circular, and the foam layer is further provided with an S-shaped cutting line located within the area of ​​the opening. Both ends of the S-shaped cutting line are connected to an annular cutting line, and the S-shaped cutting line divides the foam layer containing the opening into two teardrop-shaped foam sheets. The two circular positioning adhesive portions are respectively disposed on the two teardrop-shaped foam sheets. When the lifting portion is lifted upwards, the foam layer bonded to one of the circular positioning adhesive portions is first torn open. Then, following the tearing path guided by the S-shaped and annular cutting lines, one of the teardrop-shaped foam sheets is torn away to expose a teardrop-shaped opening. If necessary, the foam layer bonded to the other circular positioning adhesive portion can be torn open, and the tearing path guided by the S-shaped and annular cutting lines can be followed to tear away the other teardrop-shaped foam sheet to expose the entire circular opening.

[0014] In the preferred embodiment, the area of ​​the positioning adhesive portion accounts for 1 / 6 to 1 / 2 of the area of ​​the foam layer. The fact that the area of ​​the positioning adhesive portion does not exceed 1 / 2 of the foam layer means that after opening, the remaining sealing area still accounts for more than 50%, which can fully cover the edge of the packaging container opening and ensure sealing performance during secondary sealing. The 1 / 6 to 1 / 2 area range covers most usage scenarios: a small area ratio (1 / 6 to 1 / 4) is suitable for powdered (such as seasonings, milk powder) and granular (such as coffee powder) items, avoiding excessive pouring or spillage; a medium area ratio (1 / 3 to 1 / 2) is suitable for liquids (such as beverages, cooking oil) and blocky (such as nuts) items, ensuring efficient pouring without the need for repeated pouring.

[0015] In a preferred embodiment, the lifting layer is made of PP, PE, or PET, and the foaming layer is made of PP, PE, or PET.

[0016] In a further preferred embodiment, when the material of the lifting layer is the same as that of the foam layer, the lifting layer is laminated onto the upper surface of the foam layer by directly heat-sealing the positioning adhesive portion of the lifting layer onto the upper surface of the foam layer. For example, if the foam layer is made of PE, then the lifting layer is also made of PE; if the foam layer is made of PP, then the lifting layer is also made of PP.

[0017] In another further preferred embodiment, when the material of the lifting layer is not the same as that of the foam layer, the lifting layer is bonded to the upper surface of the foam layer by means of a third adhesive layer.

[0018] In a further preferred embodiment, a first film layer is adhered to the upper surface of the foamed layer; or a second film layer is adhered to the lower surface of the foamed layer; or the first film layer is adhered to the upper surface of the foamed layer and the second film layer is adhered to the lower surface of the foamed layer. By applying a film to one side of the upper or lower surface of the foamed layer, or by applying a film to both the upper and lower surfaces of the foamed layer, the toughness and tensile strength of the foamed layer can be increased.

[0019] In a further preferred embodiment, the materials of the first film layer and the second film layer are both PP, PE, or PET; when the materials of the first film layer and the second film layer are the same as the material of the foam layer, the first film layer is directly heat-sealed to the upper surface of the foam layer, and the second film layer is directly heat-sealed to the lower surface of the foam layer; when the materials of the first film layer and the second film layer are not the same as the material of the foam layer, the first film layer is bonded to the upper surface of the foam layer through a fourth adhesive layer, and the second film layer is bonded to the lower surface of the foam layer through a fifth adhesive layer.

[0020] In a preferred embodiment, the sealing layer is made of PP, PE, or PET. PP or PE materials have high transparency, protecting the lower surface of the aluminum foil layer from contamination, corrosion, and scratches during transportation, storage, and use, thus preserving its original smoothness and gloss. PET materials have high transparency, are non-toxic and odorless, have high tensile strength, good stiffness, and good adhesion. When used at room temperature, they produce straight edges and leave no residue, effectively protecting the lower surface of the aluminum foil layer.

[0021] In a preferred embodiment, a third film layer is provided on the upper surface of the aluminum foil layer, and the third film layer is laminated to the upper surface of the aluminum foil layer by a sixth adhesive layer.

[0022] In a further preferred embodiment, the material of the third film layer is PP, PE, or PET; when the material of the third film layer is the same as that of the foam layer, the third film layer is directly heat-sealed onto the lower surface of the foam layer; when the material of the third film layer is not the same as that of the foam layer, the third film layer is laminated onto the lower surface of the foam layer through a seventh adhesive layer.

[0023] In a preferred embodiment, the annular cut line has multiple bonding points. This arrangement effectively connects the inner and outer layers of the foam layer that are cut by the annular cut line, making the annular cut line with bonding points easy to tear as well.

[0024] In a further preferred embodiment, each of the bonding points is distributed at equal intervals along the circumference of the annular cut line.

[0025] Compared with the prior art, the present invention has the following advantages: (1) The lifting layer of the present invention is independent of the foam layer and the aluminum foil layer. It does not need to be combined with other layers to form a multi-layer structure. When force is applied, there is no difference in deformation of different materials. There will be no local stress superposition, film rupture or foam layer peeling, ensuring that the lifting process is stable and reliable and there is no risk of opening failure.

[0026] (2) This invention does not require the assistance of tools. The lifting part of the lifting layer can be directly hooked with the fingers, eliminating the need for puncturing and saving effort.

[0027] (3) The size of the opening of the present invention is determined by the area enclosed by the annular cutting line (the size can be preset according to the type of item, such as a small opening for powder and a medium opening for liquid), avoiding the problem of the opening being too large when the traditional whole sealing gasket is opened; precisely controlling the amount poured out, preventing items from spilling, overflowing or splashing, and reducing waste. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a specific embodiment 1 of the present invention; Figure 2 This is an enlarged cross-sectional view of specific embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the structure of a specific embodiment 2 of the present invention; Figure 4 This is an enlarged cross-sectional view of specific embodiment 2 of the present invention; Figure 5 This is a schematic diagram of the structure of a specific embodiment 3 of the present invention; Figure 6 This is a schematic diagram of the structure of specific embodiment 4 of the present invention; Figure 7 This is an enlarged cross-sectional view of specific embodiment 4 of the present invention; Figure 8 This is a schematic diagram of the structure of specific embodiment 5 of the present invention; Figure 9 This is a structural schematic diagram of a specific embodiment 6 of the present invention. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0030] Example 1, as Figure 1-2 As shown, the positioning adhesive pull-up resealing gasket in this embodiment includes a sealing layer 1, an aluminum foil layer 2, a foam layer 3, and a pull-up layer 4. The sealing layer 1 is bonded to the lower surface of the aluminum foil layer 2 by a first adhesive layer 5. The foam layer 3 is die-cut with an annular cut line 31, and the area surrounded by the annular cut line 31 forms an opening 32. The lower surface of the foam layer 3 is bonded to the upper surface of the aluminum foil layer 2 by a second adhesive layer 6. The pull-up layer 4 includes a positioning adhesive part 41 and a pull-up part 42 located on the outer periphery of the positioning adhesive part 41. The positioning adhesive part 41 is bonded to the corresponding position of the opening 32, and the lower surface of the pull-up part 42 is not in contact with the rest of the upper surface of the foam layer 3.

[0031] The aforementioned positioning adhesive pull-up resealable gasket is generally heat-sealed onto the opening of the packaging container, that is, the lower surface edge of the sealing layer 1 is heat-sealed and fixed to the opening of the packaging container.

[0032] When the sealing gasket is to be opened, since the lifting layer 4 is only partially heat-sealed to the upper surface of the foam layer 3 through the positioning adhesive part 41, the lower surface of the lifting part 42 is not adhered or bonded to the rest of the upper surface of the foam layer 3, naturally forming a lifting gap that can be easily hooked up. The user can easily hook up the edge of the lifting part 42 with just their fingers, and after pinching the lifting part 42 and applying upward force, the pulling force is transmitted to the opening 32 of the foam layer 3 through the positioning adhesive part 41, precisely tearing the foam layer 3, aluminum foil layer 2, and sealing layer 1 along the preset annular cutting line 31, exposing the opening 32 of the foam layer 3. The remaining part of the foam layer 3 is still completely adhered to the sealing edge of the packaging container, maintaining the original sealing performance.

[0033] The positioning adhesive portion 41 is circular in shape, and the shape of the opening 32 matches the shape of the positioning adhesive portion 41. The positioning adhesive portion 41 is located at any position on the lifting layer 4. The position of the positioning adhesive portion 41 can be adjusted according to the shape of the packaging container, the position of the flow outlet, and the user's hand handling habits, improving design flexibility and usability. These shapes of the positioning adhesive portion 41 are common heat-sealing shapes used in industrial production. The molds are simple to make, the processing precision is easy to control, and it can adapt to different usage habits and product types. Of course, the shape of the positioning adhesive portion 41 can also be other smooth-edged, easy-to-tear shapes.

[0034] The area of ​​the positioning adhesive portion 41 accounts for 1 / 3 of the area of ​​the foam layer 3.

[0035] The lifting layer 4 is made of PP, PE, or PET, and the foam layer 3 is also made of PP, PE, or PET. When the lifting layer 4 and the foam layer 3 are made of the same material, the lifting layer 4 is bonded to the upper surface of the foam layer 3 by directly heat-sealing the positioning adhesive portion 41 of the lifting layer 4 to the upper surface of the foam layer 3. For example, if the foam layer 3 is made of PE, then the lifting layer 4 is also made of PE; if the foam layer 3 is made of PP, then the lifting layer 4 is also made of PP.

[0036] A first film layer 33 is bonded to the upper surface of the foam layer 3, and a second film layer 34 is bonded to the lower surface of the foam layer 3. By double-sided coating the upper and lower surfaces of the foam layer 3, the toughness and tensile strength of the foam layer 3 can be increased.

[0037] The first film layer 33 and the second film layer 34 are both made of PP, PE or PET. When the materials of the first film layer 33 and the second film layer 34 are the same as the material of the foam layer 3, the first film layer 33 is directly heat-sealed to the upper surface of the foam layer 3, and the second film layer 34 is directly heat-sealed to the lower surface of the foam layer 3.

[0038] The sealing layer 1 is made of PP. The PP material has high transparency and can protect the lower surface of the aluminum foil layer 2 from contamination, corrosion, and scratches during transportation, storage, and use, thus preserving the original smoothness and luster of the lower surface of the aluminum foil layer 2.

[0039] Example 2, as Figure 3-4 As shown, the difference between the positioning adhesive pull-up resealing gasket in this embodiment and that in Embodiment 1 is: The positioning adhesive portion 41 is elliptical in shape, and the shape of the opening 32 matches the shape of the positioning adhesive portion 41. The positioning adhesive portion 41 is located at any position on the lifting layer 4. The area of ​​the positioning adhesive portion 41 occupies 1 / 3 of the area of ​​the foam layer 3.

[0040] The lifting layer 4 is made of PP, PE or PET, and the foaming layer 3 is made of PP, PE or PET. When the material of the lifting layer 4 is not the same as that of the foaming layer 3, the lifting layer 4 is bonded to the upper surface of the foaming layer 3 by means of the positioning and bonding part 41 of the lifting layer 4 being bonded to the upper surface of the foaming layer 3 by means of the third adhesive layer 7.

[0041] The first film layer 33 and the second film layer 34 are both made of PP, PE or PET; when the materials of the first film layer 33 and the second film layer 34 are not the same as the material of the foam layer 3, the first film layer 33 is bonded to the upper surface of the foam layer 3 by the fourth adhesive layer 8, and the second film layer 34 is bonded to the lower surface of the foam layer 3 by the fifth adhesive layer 9.

[0042] Example 3, as Figure 5As shown, the difference between the positioning adhesive pull-up resealing gasket in this embodiment and that in Embodiment 1 is: The positioning adhesive portion 41 is triangular in shape, and the shape of the opening 32 matches the shape of the positioning adhesive portion 41. The positioning adhesive portion 41 is located at any position on the lifting layer 4. The area of ​​the positioning adhesive portion 41 occupies 1 / 2 of the area of ​​the foam layer 3.

[0043] Example 4, as Figure 6-7 As shown, the difference between the positioning adhesive pull-up resealing gasket in this embodiment and that in Embodiment 1 is: When the shape of the positioning adhesive portion 41 does not match the shape of the opening portion 32, the area of ​​the positioning adhesive portion 41 is smaller than the area of ​​the opening portion 32. The positioning adhesive portion 41 is strip-shaped, and the opening portion 32 is circular. The strip-shaped positioning adhesive portion 41 is located at the center of the opening portion 32. Along the length direction of the strip-shaped positioning adhesive portion 41, both ends of the strip-shaped positioning adhesive portion 41 are connected to the annular cutting line 31. The lifting portion 42 is lifted upward, and the foam layer 3 bonded to one end of the strip-shaped positioning adhesive portion 41 is first torn off. Then, the tearing path is guided along the annular cutting line 31 to the other end of the strip-shaped positioning adhesive portion 41, and the foam layer 3 corresponding to the opening portion 32 is torn off to expose the opening portion 32.

[0044] Example 5, as Figure 8 As shown, the difference between the positioning adhesive pull-up resealing gasket in this embodiment and that in Embodiment 1 is: When the shape of the positioning adhesive portion 41 does not match the shape of the opening portion 32, the area of ​​the positioning adhesive portion 41 is smaller than the area of ​​the opening portion 32. The positioning adhesive portion 41 is circular, the opening portion 32 is circular, and the foam layer 3 is also provided with an arc-shaped cutting line 35. The arc-shaped cutting line 35 is located between the annular cutting line 31 and the positioning adhesive portion 41. The inner end of the arc-shaped cutting line 35 is connected to the edge of the positioning adhesive portion 41, and the outer end of the arc-shaped cutting line 35 is connected to the annular cutting line 31. The lifting portion 42 is lifted upward, first tearing the foam layer 3 bonded to the positioning adhesive portion 41, and then guiding the tearing path along the arc-shaped cutting line 35 to the annular cutting line 31, tearing off the foam layer 3 corresponding to the opening portion 32 to expose the opening portion 32.

[0045] Example 6, as Figure 9 As shown, the difference between the positioning adhesive pull-up resealing gasket in this embodiment and that in Embodiment 1 is: When the shape of the positioning adhesive portion 41 does not match the shape of the opening portion 32, the area of ​​the positioning adhesive portion 41 is smaller than the area of ​​the opening portion 32. The positioning adhesive portion 41 is shaped like two circles, and the opening portion 32 is circular. The foam layer 3 is also provided with an S-shaped cutting line 36, which is located within the area of ​​the opening portion 32. Both ends of the S-shaped cutting line 36 are connected to the annular cutting line 31, and the S-shaped cutting line 36 divides the foam layer 3 where the opening portion 32 is located into two teardrop-shaped foam sheets 37. The two circular positioning adhesive portions 41 are respectively provided on the two teardrop-shaped foam sheets 37. The lifting portion 42 is lifted upward, first tearing open the foam layer 3 bonded to one of the circular positioning adhesive portions 41, and then guiding the tearing path along the S-shaped cutting line 36 and the annular cutting line 31 to tear off one of the teardrop-shaped foam sheets 37 to expose a teardrop-shaped opening portion 32. If necessary, another foam layer 3 bonded to another circular positioning adhesive part 41 can be torn off, and the tearing path can be guided along the S-shaped cutting line 36 and the annular cutting line 31 to tear off another teardrop-shaped foam sheet 37 to expose the entire circular opening 32.

[0046] Example 7: The difference between the positioning adhesive pull-up resealing gasket in this example and that in Example 1 is that: A third film layer is provided on the upper surface of the aluminum foil layer 2, and the third film layer is laminated to the upper surface of the aluminum foil layer 2 by a sixth adhesive layer. The material of the third film layer is PP, PE or PET; if the material of the third film layer is the same as that of the foam layer 3, the third film layer is directly heat-sealed to the lower surface of the foam layer 3.

[0047] Example 8: The difference between the positioning adhesive pull-up resealing gasket in this example and Example 1 is that: A third film layer is provided on the upper surface of the aluminum foil layer 2, and the third film layer is laminated to the upper surface of the aluminum foil layer 2 by a sixth adhesive layer. The material of the third film layer is PP, PE or PET; if the material of the third film layer is not the same as that of the foam layer 3, the third film layer is laminated to the lower surface of the foam layer 3 by a seventh adhesive layer.

[0048] Furthermore, it should be noted that the names of the various parts of the specific embodiments described in this specification may differ. All equivalent or simple variations made to the structure, features, and principles described in this invention are included within the scope of protection of this invention. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this invention or exceed the scope defined in these claims, all of which should fall within the scope of protection of this invention.

Claims

1. A positioning adhesive pull-up resealing gasket, comprising a sealing layer, an aluminum foil layer, and a foam layer, wherein the sealing layer is bonded to the lower surface of the aluminum foil layer via a first adhesive layer, characterized in that: The foam layer is die-cut with an annular cutting line, and the area enclosed by the annular cutting line forms an opening. The lower surface of the foam layer is bonded to the upper surface of the aluminum foil layer through a second adhesive layer. It also includes a lifting layer, which includes a positioning adhesive portion and a lifting portion located on the outer periphery of the positioning adhesive portion. The positioning adhesive portion is bonded to the corresponding position of the opening, and the lower surface of the lifting portion is not in contact with the rest of the upper surface of the foam layer.

2. The positioning, adhesive, pull-up resealing gasket as described in claim 1, characterized in that: The positioning adhesive portion is circular, elliptical, or triangular in shape, and the shape of the opening matches the shape of the positioning adhesive portion. The positioning adhesive portion is located at any position of the lifting layer.

3. The positioning, adhesive, pull-up resealing gasket as described in claim 1, characterized in that: When the shape of the positioning adhesive part does not match the shape of the opening, the area of ​​the positioning adhesive part is smaller than the area of ​​the opening.

4. The positioning, adhesive, pull-up resealing gasket as described in claim 3, characterized in that: The positioning adhesive part is strip-shaped, and the opening is circular. The strip-shaped positioning adhesive part is located at the center of the opening. Along the length of the strip-shaped positioning adhesive part, both ends of the strip-shaped positioning adhesive part are connected to the annular cutting line.

5. The positioning, adhesive, pull-up resealing gasket as described in claim 3, characterized in that: The positioning adhesive part is circular in shape, the opening part is circular in shape, and the foam layer is also provided with an arc-shaped cutting line. The arc-shaped cutting line is located between the annular cutting line and the positioning adhesive part. The inner end of the arc-shaped cutting line is connected to the edge of the positioning adhesive part, and the outer end of the arc-shaped cutting line is connected to the annular cutting line.

6. The positioning adhesive pull-up resealing gasket as described in claim 3, characterized in that: The positioning and bonding part is shaped like two circles, the opening is shaped like a circle, and the foam layer is also provided with an S-shaped cutting line. The S-shaped cutting line is located in the area where the opening is located. Both ends of the S-shaped cutting line are connected to the annular cutting line. The S-shaped cutting line divides the foam layer where the opening is located into two teardrop-shaped foam sheets. The two circular positioning and bonding parts are respectively set on the two teardrop-shaped foam sheets.

7. The positioning adhesive pull-up resealing gasket as described in claim 1, characterized in that: The area of ​​the positioning adhesive portion accounts for 1 / 6 to 1 / 2 of the area of ​​the foam layer; The sealing layer is made of PP, PE or PET.

8. The positioning adhesive pull-up resealing gasket as described in claim 1, characterized in that: The lifting layer is made of PP, PE or PET, and the foaming layer is made of PP, PE or PET. When the material of the lifting layer is the same as that of the foam layer, the lifting layer is laminated to the upper surface of the foam layer by directly heat-sealing the positioning adhesive part of the lifting layer to the upper surface of the foam layer. Alternatively, if the material of the lifting layer is not the same as that of the foam layer, the lifting layer is bonded to the upper surface of the foam layer by means of a third adhesive layer.

9. The positioning, adhesive, pull-up resealing gasket as described in claim 8, characterized in that: A first film layer is adhered to the upper surface of the foamed layer; or a second film layer is adhered to the lower surface of the foamed layer; or a first film layer is adhered to the upper surface of the foamed layer and a second film layer is adhered to the lower surface of the foamed layer.

10. The positioning, adhesive, pull-up resealing gasket as described in claim 9, characterized in that: The first and second film layers are both made of PP, PE, or PET. When the materials of the first and second film layers are the same as those of the foam layer, the first film layer is directly heat-sealed to the upper surface of the foam layer, and the second film layer is directly heat-sealed to the lower surface of the foam layer. When the materials of the first and second film layers are not the same as those of the foam layer, the first film layer is bonded to the upper surface of the foam layer through a fourth adhesive layer, and the second film layer is bonded to the lower surface of the foam layer through a fifth adhesive layer.

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