Two-piece sealing liner

Abstract

The present disclosure provides a two-piece sealing liner, comprising: a backing layer, which is a paperboard or a foam-board film; an adhesive sealing composite layer, which sequentially comprises, from top to bottom, an electromagnetic induction heating layer and an adhesive sealing layer; and a weak adhesive layer, which is located between the backing layer and the adhesive sealing composite layer, such that the peel strength between the backing layer and the adhesive sealing composite layer, measured according to the ASTM D903 standard, is 0.05 N / 15 mm or more and 2.26 N / 15 mm or less.

Description

Two-piece sealing gasket

[0001] Cross-reference of related applications

[0002] This application claims priority to Chinese Patent Application No. PCT / CN2025 / 091475, filed on April 27, 2025, entitled "Two-Piece Sealing Gasket", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to a two-piece sealing gasket. Background Technology

[0004] In a typical two-piece sealing gasket (especially a sealing gasket consisting of cardboard and aluminum foil), from top to bottom, it includes cardboard, a wax layer, aluminum foil, and a heat-sealing adhesive layer. After electromagnetic induction heating, the coating is fully applied (the coating amount is approximately 25–40 g / m²). 2 The wax layer will melt and be absorbed by the cardboard, while the aluminum foil will be sealed to the container opening by the heat-sealing adhesive layer, and the cardboard will be secured inside the bottle cap.

[0005] By using a known two-piece sealing gasket, the container opening is sealed through cardboard and aluminum foil, which can prevent leakage of the contents and preserve the contents. Summary of the Invention

[0006] However, in known two-piece sealing gaskets, although most of the wax layer is absorbed by the cardboard, once the diameter of the sealing gasket is greater than 42mm, when the bottle cap is opened after electromagnetic induction sealing, residual wax is often seen adhering to the aluminum foil at the bottle mouth, or the cardboard is stuck to the aluminum foil and cannot be separated, creating a very unpleasant experience for the user. Moreover, even if the cardboard is pushed back into the bottle cap with a finger to reseal it, not only will the finger contaminate the cardboard, but the pure cardboard left inside the bottle cap also lacks the function of resealing, as pure cardboard cannot block either oxygen or moisture.

[0007] Therefore, in order to solve the above-mentioned problems encountered by known two-piece sealing gaskets, it is necessary to develop a two-piece sealing gasket in which the backing layer and the adhesive sealing composite layer can be easily separated after sealing, and the backing layer left in the bottle cap also has the function of resealing. This has become an urgent problem to be solved in this technical field.

[0008] To address the aforementioned issues, this disclosure provides a two-piece sealing gasket comprising: a backing layer, which is cardboard or foamed film; an adhesive composite layer, which, from top to bottom, includes an electromagnetic induction heating layer and an adhesive layer; and a weak adhesive layer located between the backing layer and the adhesive composite layer, such that the peel strength between the backing layer and the adhesive composite layer, as measured by ASTM D903 standard, is greater than 0.05 N / 15 mm and less than 2.26 N / 15 mm.

[0009] In an embodiment, a release layer is also included, which is located below the weak adhesive layer. The release layer is made of a varnish or silicone oil that is applied in a full-coverage or dot-coated manner.

[0010] In an embodiment, a barrier layer is further included above the weak adhesive layer. The barrier layer is made of at least one material selected from the group consisting of PET, polyamide (PA), polyvinylidene chloride (PVDC), and ethylene-vinyl alcohol copolymer (EVOH).

[0011] In the embodiments, the material of the weak adhesive layer includes polyolefin; or, the material of the weak adhesive layer includes polyurethane; or, the material of the weak adhesive layer includes wax, and the coating method of the weak adhesive layer is dot coating or full-area coating.

[0012] In the embodiments, the sealing layer is a hot melt adhesive or a combination of a sealing film and an adhesive, and the hot melt adhesive is selected from polyethylene (PE), polypropylene (PP), ethylene / vinyl acetate copolymer (EVA), polyisobutylene (PIB), ethylene-ethyl acrylate (EEA), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-methyl acrylate copolymer (EMAC), polyacrylate, polyacetate, and ethylene butyl acrylate. The adhesive is selected from at least one of the group consisting of acrylate (EBA); the sealing film is selected from at least one of the group consisting of paper, polyethylene (PE), polypropylene (PP), polyamide (PA), polyvinylidene chloride (PVDC), ethylene vinyl alcohol copolymer (EVOH), and polyethylene terephthalate (PET); the adhesive is located between the electromagnetic induction heating layer and the sealing film.

[0013] In an embodiment, the following components are further included sequentially between the weak adhesive layer and the electromagnetic induction heating layer: a surface film, the composition of which includes at least one of the group consisting of PP, PET, PE, polyamide (PA), PEN, and polyimide (PI); a super adhesive; and a bonding film, which is bonded to the surface film by the super adhesive, and whose composition includes at least one of the group consisting of PET, PE, PP, PA, EPP, and EPE; wherein the super adhesive provides a peel strength between the surface film and the bonding film greater than 17.8 N / 15 mm. In an embodiment, the aforementioned surface film, super adhesive, and bonding film may be further included sequentially between the release layer and the electromagnetic induction heating layer.

[0014] In an embodiment, the super adhesive is used to composite a portion of the surface film and the connecting film, and its material is a dry composite adhesive or a hot melt laminate, wherein the material of the hot melt laminate is selected from at least one of the group consisting of PE, PP, EMAC, EMAA, EEA, EAA and EMMA.

[0015] In embodiments, a flap layer may also be included, which is bonded to the underside of the surface film by a super-strong adhesive, and its material may be at least one selected from the group consisting of paper, PET, PP, PA, PEN, and PI, but is not limited thereto. The thickness of the flap film is preferably 12 to 50 μm, and the width of the flap layer is between 1 / 6 and 5 / 6 times the diameter of the two-piece sealing gasket.

[0016] Additionally, in one embodiment, the side of the backing layer facing the electromagnetic induction heating layer has a polyolefin coating layer, and the polyolefin is at least one of the group consisting of polyethylene, polypropylene, polypentene and polyhexene.

[0017] In this embodiment, the electromagnetic induction heating layer is an aluminum foil or a wireless information integration sheet.

[0018] In one embodiment, the wireless information integrated sheet includes: a base film; an information and heating layer, which includes an information area and an electromagnetic induction heating ring; and a first adhesive layer located between the base film and the information and heating layer; wherein the information area has an antenna and a chip that are mutually connected, and the electromagnetic induction heating ring surrounds the information area in a planar view.

[0019] In one embodiment, the wireless information integration sheet further includes: a protective layer located on the side of the information and heating layer away from the base film; and a second adhesive layer located between the information and heating layer and the protective layer.

[0020] In one embodiment, there is a gap between the electromagnetic induction heating ring and the information area. In another embodiment, this gap is the distance between the outermost edge of the information area and the innermost edge of the electromagnetic induction heating ring, and the gap is between 0.1 mm and 3 mm. In a preferred embodiment, the gap between the electromagnetic induction heating ring and the information area is completely filled.

[0021] In an embodiment, the information and heating layer also includes at least one physical connection bridge for connecting the information area and the electromagnetic induction heating ring.

[0022] On the other hand, in an embodiment, between the weak adhesive layer and the sealing layer, there are further, in sequence: a surface film, the composition of which includes at least one of the group consisting of PP, PET, PE, PA, PEN and PI; a bonding film, the composition of which includes at least one of the group consisting of PET, PE, PP, PA, EPP and EPE; and a strong adhesive layer; in addition, the two-piece sealing gasket also includes a release block, the material of which can be selected from at least one of the group consisting of free wax, varnish and silicone oil, and it is located on the lower surface of the bonding film or on the upper or lower surface of the electromagnetic induction heating layer; the strong adhesive layer is a dry composite adhesive or a hot melt composite adhesive, and the peel strength between the bonding film and the electromagnetic induction heating layer is greater than 12N / 15mm.

[0023] Furthermore, in this embodiment, the upper surface of the two-piece sealing gasket includes: a lifting portion; a lifting neck; and a hollowed-out area, which is cut by a hollowed-out cutting line. The hollowed-out area is located around the lifting portion and is connected to both sides of the lifting neck. The thickness of the two-piece sealing gasket corresponding to the hollowed-out area is less than the overall thickness of the two-piece sealing gasket. The upper surface of the two-piece sealing gasket is provided with a tear line. One end of the tear line is connected to the lifting portion, and the other end of the tear line is separated from the outermost ring of the two-piece sealing gasket by a tear gap greater than or equal to 0 mm. Less than or equal to 20mm; wherein, the tear line has at least one tearing and cutting point, the surface film corresponding to the at least one tearing and cutting point is not completely cut in the vertical direction, and the surface film corresponding to the tear line except for the at least one tearing and cutting point is completely cut; and the release block is located on the lower surface of the connecting film corresponding to the lifting part, and the coating area of ​​the release block is not less than the lifting part, or the release block is located on the upper or lower surface of the electromagnetic induction heating layer corresponding to the lifting part, the lifting neck and the hollow area, and the coating area of ​​the release block is not less than the lifting part and the hollow area.

[0024] In the embodiment, the lifting part, the lifting neck, and the hollow area are all located in the same half of the two-piece sealing gasket. The upper surface of the two-piece sealing gasket is also provided with a tear-twist cutting line, which is connected to the lifting part, and the tear line and the tear-twist cutting line are respectively connected to both ends of the lifting part.

[0025] The inventors have developed a two-piece sealing gasket, and after sealing, the peel strength between the backing layer (cardboard or foam film) and the electromagnetic induction heating layer, measured according to ASTM D903 standard, is above 0.05 N / 15 mm and below 2.26 N / 15 mm. Therefore, if electromagnetic induction sealing is used, the energy required for electromagnetic induction sealing is no longer consumed in the melting and absorption of the coated wax, achieving the effects of carbon reduction and energy saving.

[0026] This disclosure addresses the aforementioned known problems and aims to provide a two-piece sealing gasket that achieves carbon reduction and energy saving. In a preferred embodiment, the release layer and / or release area and / or release block further enhance the ease of tearing for the user.

[0027] According to the two-piece sealing gasket of this disclosure, because the backing layer and the adhesive-sealing composite layer are bonded through a weak adhesive layer, the peel strength between the backing layer and the adhesive-sealing composite layer, measured according to ASTM D903 standard, is above 0.05 N / 15 mm and below 2.26 N / 15 mm. Therefore, when the adhesive film is bonded to the container opening of the product container by electromagnetic induction heating for sealing, the peel strength between the backing layer and the adhesive-sealing composite layer is less than the clamping strength of the backing layer (e.g., cardboard) in the gasket groove within the bottle cap (preferably more than twice the peel strength between the backing layer and the adhesive-sealing composite layer), and the peel strength between the backing layer and the adhesive-sealing composite layer is also less than the adhesive strength between the adhesive-sealing composite layer and the container opening (preferably more than twice the peel strength between the backing layer and the adhesive-sealing composite layer), allowing the backing layer and the adhesive-sealing composite layer to be easily separated. In this case, even if electromagnetic induction sealing is not used, but instead glue is applied to the container opening to bond the sealing film to the container opening, the backing layer and the sealing composite layer can be easily separated because the peel strength of the backing layer and the sealing composite layer is less than the clamping strength of the backing layer in the gasket groove inside the cap, and also less than the adhesive strength between the sealing film (e.g., the sealing film is paper) and the container opening.

[0028] Overview of the attached figures

[0029] Figure 1 is a cross-sectional schematic diagram of a two-piece sealing gasket according to an embodiment of the present disclosure.

[0030] Figure 2 is a cross-sectional schematic diagram of a two-piece sealing gasket according to another embodiment of the present disclosure.

[0031] Figure 3A is a cross-sectional schematic diagram of a two-piece sealing gasket according to another embodiment of the present disclosure.

[0032] Figure 3B is a cross-sectional schematic diagram of a two-piece sealing gasket according to another embodiment of the present disclosure.

[0033] Figure 4 is a cross-sectional schematic diagram of an adhesive composite layer of a modified embodiment of the present disclosure.

[0034] Figure 5A is a cross-sectional schematic diagram of a two-piece sealing gasket according to another embodiment of the present disclosure.

[0035] Figure 5B is a cross-sectional schematic diagram of a two-piece sealing gasket according to another embodiment of the present disclosure.

[0036] Figure 5C is a cross-sectional schematic diagram of a two-piece sealing gasket according to another embodiment of the present disclosure.

[0037] Figure 6 is a top view of a two-piece sealing gasket according to yet another embodiment of the present disclosure.

[0038] Figure 7 is a cross-sectional schematic diagram illustrating the wireless information integration chip of the first embodiment of this disclosure.

[0039] Figure 8A is a plan view illustrating the information of this disclosure and a specific example of a heating layer.

[0040] Figure 8B is a plan view illustrating another specific example of the heating layer used to explain the information of this disclosure.

[0041] Figure 9A is a plan view illustrating a specific example of the information area of ​​this disclosure.

[0042] Figure 9B is a plan view illustrating another specific example of the information area of ​​this disclosure.

[0043] Figure 10 is a cross-sectional schematic diagram illustrating the wireless information integration chip of the second embodiment of the present disclosure.

[0044] Figure 11 is a top view schematic diagram illustrating the two-piece sealing gasket of this disclosure.

[0045] Figures 12A to 12C are top views illustrating other specific examples of the present disclosure of two-piece sealing gaskets.

[0046] Preferred embodiments of this disclosure

[0047] The following specific embodiments illustrate the implementation of this disclosure. Those skilled in the art can understand other advantages and effects of this disclosure from the content disclosed in this specification. This disclosure can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the spirit of this disclosure.

[0048] Unless otherwise stated herein, the term “A to B” as used in the specification and the appended claims includes the meaning of “more than A and less than B”. For example, the term “10 to 40% by weight” includes the meaning of “more than 10% by weight and less than 40% by weight”.

[0049] First Implementation Form

[0050] First, please refer to Figure 1, which is a cross-sectional schematic diagram of a two-piece sealing gasket 100 according to an embodiment of the present disclosure. As shown in Figure 1, the two-piece sealing gasket 100 according to an embodiment of the present disclosure includes: a backing layer 1, which is a cardboard or foamed film; an adhesive composite layer 3, which includes, from top to bottom, an electromagnetic induction heating layer 31 and an adhesive layer 32; and a weak adhesive layer 2, which is located between the backing layer 1 and the adhesive composite layer 3, such that the peel strength between the backing layer 1 and the adhesive composite layer 3, as measured by ASTM D903 standard, is above 0.05 N / 15 mm and below 2.26 N / 15 mm. Additionally, although a release layer 9 is shown in Figure 1, the release layer 9 is not a necessary structure, i.e., the release layer 9 can be omitted in various embodiments of the present disclosure. Hereinafter, each layer will be described in detail.

[0051] Backing layer

[0052] Backing layer 1 is one of the sealing layers in a two-piece sealing gasket. In a preferred embodiment, because the side of backing layer 1 facing the electromagnetic induction heating layer has at least one polyolefin coating layer (not shown), it can effectively isolate oxygen and moisture, thus producing a further sealing effect. Specifically, when the bottle cap is opened after electromagnetic induction sealing, the backing layer, which is engaged inside the bottle cap, can produce a resealing effect due to this polyolefin coating layer, preventing the contents from spoiling or becoming damp. This polyolefin coating layer can be polyethylene, polypropylene, polypentene, or polyhexene, and its thickness is 4μm to 100μm, thereby making the contents of the container less susceptible to the effects of moisture and oxygen. Next, backing layer 1 can be cardboard or foamed film. The thickness of the cardboard can be 0.2mm to 2mm. In addition, the foamed sheet film is composed of expandable polyethylene (EPE) or expandable polypropylene (EPP), and its thickness is 0.2 mm to 3 mm.

[0053] weak adhesive layer

[0054] A weak adhesive layer 2 is used to bond the backing layer 1 and the adhesive-sealing composite layer 3. Specifically, the weak adhesive layer 2 bonds the lower surface of the backing layer 1 (e.g., the lower surface of cardboard) to the upper surface of the adhesive-sealing composite layer 3 (e.g., the upper surface of the electromagnetic induction heating layer). The weak adhesive layer 2 ensures that the peel strength between the backing layer 1 and the adhesive-sealing composite layer 3, measured according to ASTM D903 standard, is greater than 0.05 N / 15 mm and less than 2.26 N / 15 mm. This allows, after electromagnetic induction heating, the backing layer 1 (e.g., cardboard) and the electromagnetic induction heating layer in the adhesive-sealing composite layer 3 to form a two-piece separable sealing gasket. Specifically, the electromagnetic induction heating layer 31 is sealed to the container opening by the adhesive layer 32, while the backing layer 1 is held in place inside the bottle cap.

[0055] In one specific example, the weak adhesive layer 2 is made of polyolefins, including but not limited to polyethylene, polypropylene, polypentene, and polyhexene, and has a thickness of 4 μm to 100 μm. Alternatively, in another specific example, the weak adhesive layer 2 is made of polyurethane and has a thickness of 0.5 μm to 6 μm. Yet another specific example, the weak adhesive layer 2 is made of wax, and the coating method is either dot-coating or full-area coating, with a coating amount of 1 to 40 g / m². 2 The preferred concentration is 1–9 g / m³. 2 The coating amount of the weak adhesive layer can be adjusted according to the diameter of the sealing gasket. For example, sealing gaskets with a diameter of less than 40mm can be paired with a larger coating amount (e.g., 1-40g / m²). 2 Sealing gaskets with a diameter of 40mm to 60mm can be used with a smaller coating amount (e.g., 1 to 9 g / m²). 2 Sealing gaskets with a diameter greater than 60mm can be used with a smaller coating amount (e.g., 1-5 g / m²). 2 This reduces the energy absorbed by the wax in the weak adhesive layer 2.

[0056] Release layer

[0057] As shown in Figure 1, the release layer 9 is located below the weak adhesive layer 2 and above the electromagnetic induction heating layer 31. The release layer 9 is a silicone oil or varnish that is fully coated or dotted, and its thickness is 0.5 μm to 20 μm. By further including the release layer 9, the ease of tearing open by the user can be improved.

[0058] Adhesive composite layer

[0059] The sealing composite layer 3 includes an electromagnetic induction heating layer 31 and an adhesive layer 32. In the embodiments of Figures 1 and 2, the electromagnetic induction heating layer 31 may be, for example, an aluminum foil film of 6 μm to 40 μm, which makes the contents of the container less susceptible to the effects of moisture and oxygen. In addition, the upper surface of the aluminum foil layer may be a printed layer of 1 μm to 20 μm (not shown). In the embodiments of Figures 3A and 5A to 5C, the electromagnetic induction heating layer 31 may be, for example, an aluminum foil film of 10 μm to 40 μm.

[0060] Furthermore, the present disclosure can use the wireless information integration chip described later as an electromagnetic induction heating layer, which can effectively reduce the amount of aluminum foil used and reduce energy consumption. Specifically, the wireless information integration chip of the present disclosure can increase the function of wireless information transmission, reduce aluminum foil material waste, reduce energy consumption, avoid manpower waste, avoid interference from metals and liquids, improve production efficiency, provide good communication performance and significantly increase communication distance, thereby greatly improving the automation, digitalization and intelligent development of factories, warehouses, logistics, shops and unmanned checkout management.

[0061] The sealing layer 32 is mainly used to seal the container opening. It can be a hot melt adhesive and has a thickness of 4μm to 100μm. Specifically, as shown in Figure 1, the sealing layer 32 can be a single-layer hot melt adhesive, which can be selected from at least one of the group consisting of polyethylene (PE), polypropylene (PP), ethylene / vinyl acetate copolymer (EVA), polyisobutylene (PIB), ethylene-ethyl acrylate (EEA), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), polyacrylate, polyacetate, ethylene butyl acrylate (EBA), and ethylene-methyl acrylate copolymer (EMAC). With this hot melt adhesive, it is not necessary to use an adhesive. In addition, certain combinations of hot melt adhesives can eliminate the need for adhesives and achieve a continuous seal even when the contents of the glass container contain water, as well as when the contents of the glass container contain pungent additives, honey, garlic, and chili peppers.

[0062] Additionally, this embodiment may include a barrier layer (not shown). This barrier layer is located above the weakly adhesive layer, and its material is selected from at least one group consisting of PET, polyamide (PA), polyvinylidene chloride (PVDC), and ethylene-vinyl alcohol copolymer (EVOH), and its thickness is 12 μm to 100 μm. This barrier layer further blocks moisture and oxygen.

[0063] Furthermore, although not illustrated, the layers of the two-piece sealing gasket in this embodiment can be bonded together in various ways (e.g., adhesive, joint, or connection).

[0064] Second Implementation Form

[0065] Next, please refer to Figure 2, which is a cross-sectional schematic diagram of a two-piece sealing gasket 200 according to another embodiment of the present disclosure. As shown in Figure 2, the two-piece sealing gasket 200 according to another embodiment of the present disclosure includes: a backing layer 1, a weak adhesive layer 2, an adhesive-sealing composite layer 3, and a release layer 9. In this embodiment, the backing layer 1, the weak adhesive layer 2, and the release layer 9 are the same as those described in the first embodiment, so their description is omitted. Hereinafter, the adhesive-sealing composite layer 3 of the second embodiment will be described in detail.

[0066] Adhesive composite layer

[0067] The adhesive-sealing composite layer 3 of this embodiment comprises, from top to bottom, an electromagnetic induction heating layer 31 and an adhesive layer 32. In this embodiment, the adhesive layer 32 is a combination of an adhesive film 322 and an adhesive 321. The thickness of the adhesive film 322 is 12μm to 100μm, and the adhesive 321 is located between the electromagnetic induction heating layer 31 and the adhesive film 322.

[0068] Alternatively, the sealing layer 32 (a single layer of hot melt adhesive) of the first embodiment can also be used in the second embodiment, while the sealing layer 32 (a combination of sealing film 322 and adhesive 321) of the second embodiment can also be used in the first embodiment.

[0069] Third Implementation Form

[0070] Next, please refer to Figure 3A, which is a cross-sectional schematic diagram of a two-piece sealing gasket 300 according to another embodiment of the present disclosure. As shown in Figure 3A, the two-piece sealing gasket 300 according to another embodiment of the present disclosure includes, from top to bottom: a backing layer 1, a weak adhesive layer 2, an optional release layer 9, a surface film 4, an optional release area 6, a super adhesive 5, a bonding film 7, an optional first adhesive layer 8, and an adhesive-sealing composite layer 3 (which may be the electromagnetic induction heating layer 31 and the adhesive-sealing layer 32 mentioned above). In this embodiment, the backing layer 1, the weak adhesive layer 2, the release layer 9, and the adhesive-sealing composite layer 3 may be the same as those described in the first embodiment or the second embodiment, so their description is omitted. Hereinafter, the other layers of the third embodiment will be described in detail.

[0071] Surface film

[0072] The upper or lower surface of the surface film 4 can be a printing surface for printing different patterns. In one specific example, the composition of the surface film 4 includes at least one of the group consisting of PP, PET, PE, PA, PEN and PI. The thickness of the surface film 4 is preferably 12μm to 150μm, within which the tensile strength is greater, and the surface is smooth and glossy.

[0073] Super adhesive

[0074] The super-strong adhesive 5 is used to bond a portion of the surface film 4 to the connecting film 7, resulting in a peel strength between the two films greater than 17.8 N / 15 mm, providing a strong bond. This allows the layers below the connecting film 7 (e.g., the adhesive-bonded composite layer 3) to be peeled off simultaneously when the user removes the two-piece sealing gasket. In one specific example, the super-strong adhesive is a dry-bonded adhesive, and its thickness is 1 μm to 7 μm. The super adhesive can also be a hot melt laminate, and the material of the hot melt laminate can be selected from at least one of the group consisting of PE, PP, ethylene-methyl acrylate copolymer (EMAC), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate (EEA), and ethylene-methyl methacrylate copolymer (EMMA), and the thickness of the hot melt laminate is 4μm to 50μm.

[0075] Release region

[0076] In Figure 3A, release area 6 is located below surface film 4 and is in contact with surface film 4 and part of super adhesive 5, but not directly in contact with connecting film 7. Alternatively, release area 6 may be above connecting film 7 (not shown), and release area 6 may be in contact with connecting film 7 and part of super adhesive 5, but not directly in contact with surface film 4. Release area 6 is composed of varnish or silicone oil and has a thickness of 0.5 μm to 20 μm. When the user pinches and pulls release area 6 upwards, the two-piece sealing gasket can be peeled off by pinching and pulling because surface film 4 and connecting film 7 are still bonded together by super adhesive 5.

[0077] Furthermore, referring to FIG6, which is a top view of a two-piece sealing gasket 300 according to another embodiment of the present disclosure. In one specific example, as shown in FIG6, when the two-piece sealing gasket 300 is approximately circular in top view, the coating width W of the release zone 6 is between 1 / 6 and 5 / 6 times the diameter D of the two-piece sealing gasket 300, i.e., 1 / 6D≦W≦5 / 6D. Therefore, the coating width W of the release zone 6 is not limited to W=1 / 2D, and the two-piece sealing gasket can be conveniently designed to accommodate different sealing gasket diameters while improving the ease with which the user can tear open the sealing gasket.

[0078] Connecting membrane

[0079] The connecting film 7 is mainly used for lamination with the electromagnetic induction heating layer 31, and a portion of the connecting film 7 is laminated with the surface film 4 via a super adhesive 5. In one specific example, the connecting film 7 is composed of at least one of the group consisting of PET, PP, PE, PA, EPP, and EPE, and has a thickness of 12μm to 200μm; thereby, its peel strength after lamination with the electromagnetic induction heating layer 31 can be improved. In addition, in one specific example, the connecting film 7 and the electromagnetic induction heating layer 31 can be laminated via a first adhesive layer 8. The first adhesive layer 8 can be a known adhesive, such as a dry lamination adhesive, and is not particularly limited.

[0080] Example of changes in the third implementation form

[0081] Next, please refer to Figure 3B, which is a cross-sectional schematic diagram of a two-piece sealing gasket 300' according to another embodiment of the present disclosure. As shown in Figure 3B, the two-piece sealing gasket 300' according to another embodiment of the present disclosure includes, from top to bottom: a backing layer 1, a weak adhesive layer 2, an optional release layer 9, a surface film 4, a super adhesive 5, an optional flap layer 6B, a connecting film 7, an optional first adhesive layer 8, and an adhesive-sealing composite layer 3 (which may be the aforementioned electromagnetic induction heating layer 31 and adhesive-sealing layer 32). In this embodiment, except for the flap layer 6B, all other layers can be the same as in the third embodiment, so their description is omitted. The flap layer 6B is bonded to the underside of the surface film 4 by the super adhesive 5, and its composition may include at least one of the group consisting of paper, PET, PP, PA, PEN, and PI, and the width of the flap layer 6B is between 1 / 6 and 5 / 6 times the diameter of the two-piece sealing gasket 300'. Therefore, when the user pinches and pulls the flap layer 6B upwards, the surface film 4 and the connecting film 7 are still in a composite state due to the super adhesive 5, so the two-piece sealing gasket 300' can be opened by pinching and pulling.

[0082] Wireless Information Integration Chip

[0083] Next, a wireless information integration chip that can serve as the electromagnetic induction heating layer of this disclosure will be described.

[0084] First, please refer to FIG7, which is a cross-sectional schematic diagram illustrating the wireless information integration sheet 100w according to the first embodiment of the present disclosure. As shown in FIG7, the wireless information integration sheet 100w may include a base film 1w, a first adhesive layer 2w, and an information and heating layer 3w. The first adhesive layer 2w is located between the base film 1w and the information and heating layer 3w to bond the base film 1w and the information and heating layer 3w. The various structures will be described in more detail below.

[0085] The base film 1w is used as the initial layer for fabricating the wireless information integration sheet. In one specific example, the material of the base film 1w can be at least one selected from the group consisting of PI, PEN, PET, polycarbonate (PC), PP, and PE. The thickness of the base film 1w is preferably 20 μm to 150 μm, within which longitudinal tensile strength is greater. Furthermore, as shown in Figure 7, the lower surface of the base film 1w is bonded to the first adhesive layer 2w, while the upper surface of the base film 1w can serve as a printing surface for printing different patterns.

[0086] The first adhesive layer 2w is used to bond the base film 1w and the information to the heating layer 3w. In some specific examples, the first adhesive layer 2w only needs to be able to bond the base film 1w and the information to the heating layer 3w, and its material can be, for example, a dry composite adhesive. The thickness of the first adhesive layer 2w can be, for example, from 0.5μm to 7μm, which allows the peel strength between the two bonded materials to be greater than 4N / 15mm.

[0087] Taking Figure 7 as an example, the information and heating layer 3w includes an information area 31w and an electromagnetic induction heating ring 32w. The information area 31w has the function of wireless information reading and writing transmission, so as to facilitate subsequent product traceability. Among them, the information area 31w has an antenna 312w and a chip 311w that are interconnected. The electromagnetic induction heating ring 32w can be heated by electromagnetic induction through the electromagnetic field generated by the electromagnetic induction sealing machine, so that the adhesive layer of the sealing gasket is heated and melted and adhered to the container opening, thereby acting as an electromagnetic induction sealing gasket to seal the container opening. By including the wireless information integrated chip of this disclosure, most of the heat can be generated in the electromagnetic induction heating ring 32w, and very little heat is conducted only in at least one physical connection bridge 33w between the antenna 312w and the electromagnetic induction heating ring 32w. The length of the physical connection bridge 33w can be 0.1mm to 3mm, the width of the physical connection bridge 33w can be 0.01mm to 5mm, and the material of the physical connection bridge 33w can be the same as that of the antenna 312w. This not only prevents a large amount of heat from being transferred to the central area of ​​the sealing gasket during electromagnetic induction sealing, but also saves energy. When applied to sealing gaskets containing batteries, the thickness of the information and heating layer 3w can be from 6μm to 2.5mm; while when applied to sealing gaskets without batteries, the thickness of the information and heating layer 3w can be from 6μm to 300μm.

[0088] Next, Figure 8A is a plan view illustrating a specific example of the information and heating layer 3w of this disclosure, and Figure 8B is a plan view illustrating another specific example of the information and heating layer 3w of this disclosure. As shown in Figures 8A and 8B, the electromagnetic induction heating ring 32w surrounds the information area 31w in a planar view. As shown in Figure 8A, the electromagnetic induction heating ring 32w and the information area 31w are filled with a spacer ITV, that is, there are no physical connecting elements (such as physical connecting bridges described later) between the electromagnetic induction heating ring 32w and the information area 31w. Therefore, by filling the spacer ITV between the electromagnetic induction heating ring 32w and the information area 31w, this filled spacer ITV can block heat conduction to the information area 31w when electromagnetic induction heating occurs, which is a preferred configuration. This spacer ITV (the distance between the outermost edge of the information area and the innermost edge of the electromagnetic induction heating ring) can be 0.1 mm to 3 mm. Next, as shown in Figure 8B, a gap ITV is provided at most of the location between the electromagnetic induction heating ring 32w and the information area 31w. This gap ITV can block most of the heat conduction to the information area 31w when electromagnetic induction heating occurs, and the gap ITV (the distance between the outermost edge of the information area and the innermost edge of the electromagnetic induction heating ring) can be 0.1mm to 3mm. In addition, there can be at least one physical connection bridge 33w (two are indicated in Figures 8B and 9B) between the antenna 312w and the electromagnetic induction heating ring 32w. The length of the physical connection bridge 33w can be 0.1mm to 3mm, and the width of the physical connection bridge 33w can be 0.01mm to 5mm. At this time, although the closed-loop electromagnetic induction heating ring 32w and the information area 31w are electrically connected, the wireless communication distance is not reduced significantly. In other words, the space between the electromagnetic induction heating ring 32w and the information area 31w can be filled with the ITV, and can have both the ITV and the physical connection bridge 33w at the same time, or it can be without the space (for example, the space between the electromagnetic induction heating ring 32w and the information area 31w can be filled with the physical connection bridge 33w).

[0089] In some specific examples, the electromagnetic induction heating ring 32w may be made of metal, such as aluminum, copper, gold, silver, or tin, but is not limited to these. From the viewpoint of the effect of generating heat when subjected to a changing electromagnetic field and cost, the electromagnetic induction heating ring 32w is preferably made of aluminum foil, and its thickness is preferably 6μm to 40μm.

[0090] Next, Figure 9A is a plan view illustrating a specific example of the information area 31w of this disclosure, and Figure 9B is a plan view illustrating another specific example of the information area 31w of this disclosure. Figure 9A corresponds to the embodiment in Figure 8A where the electromagnetic induction heating ring 32w and the information area 31w are filled with spaced ITVs, and Figure 9B corresponds to the embodiment in Figure 8B where most of the space between the electromagnetic induction heating ring 32w and the information area 31w has spaced ITVs. Furthermore, as shown in Figures 9A or 9B, the information area 31w includes a chip 311w and an antenna 312w. When wireless information transmission functionality is achieved, the chip 311w and the antenna 312w can be arranged in the manner shown in Figures 9A or 9B, or in other ways, based on the RFID frequency band desired by the user, without particular limitation.

[0091] On the other hand, regarding chip 311w, it can have a unique identification code and can be selected according to the purpose. For example, it can be a radio frequency identification near field communication (RFID_NFC) chip, a radio frequency identification high frequency (RFID_HF) chip, a radio frequency identification ultra-high frequency (RFID_UHF) chip, or a radio frequency identification microwave (RFID_MW) chip, etc., without any particular limitation. All of these chips can be matched with antenna 312w described later to realize wireless information communication functions.

[0092] Next, regarding the antenna 312w, its main function is to generate wirelessly transmitted signals. Its material can be metal, such as copper, silver, gold, tin or aluminum, without any particular restrictions.

[0093] Furthermore, although Figure 7 shows the case where the base film 1w is on top and the information and heating layer 3w is on the bottom, the order of the base film 1w and the information and heating layer 3w can be reversed as needed, i.e., adjusted so that the base film 1w is on the bottom and the information and heating layer 3w is on top.

[0094] Alternatively, the wireless information integration sheet can also be a wireless information integration sheet 100w', which, as shown in Figure 10, includes a protective layer 5w and a second adhesive layer 4w in addition to the aforementioned base film 1w, first adhesive layer 2w, and information and heating layer 3w. The protective layer 5w is located on the side of the information and heating layer 3w away from the base film 1w. The second adhesive layer 4w is located between the information and heating layer 3w and the protective layer 5w, and serves to bond the information and heating layer 3w and the protective layer 5w.

[0095] In some specific examples, the second adhesive layer 4w only needs to be able to bond the information to the heating layer 3w and the protective layer 5w, and its material can be, for example, a dry composite adhesive, without particular limitation. The thickness of the second adhesive layer 4w can be from 0.5μm to 7μm, preferably such that the peel strength between the two bonded materials is greater than 4N / 15mm. In addition, as shown in Figure 10, the second adhesive layer 4w can extend to fill the gap between the electromagnetic induction heating ring 32w and the information area 31w to improve the overall structural strength of the wireless information integration piece 100w'.

[0096] Next, the protective layer 5w will be described. The protective layer 5w is used to protect the information area 31w (i.e., chip 311w, antenna 312w, and a separately added battery) from external damage to the chip 311w and battery, thus preventing them from affecting the wireless information transmission capability. The material of the protective layer 5w can be at least one selected from the group consisting of polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE), polyamide (PA), polyvinylidene chloride (PVDC), ethylene-vinyl alcohol copolymer (EVOH), polyethylene naphthalate (PEN), and polyimide (PI). In some preferred embodiments, the thickness of the protective layer 5w can be, for example, 12 to 100 μm.

[0097] Furthermore, either the upper or lower surface of the protective layer 5w can be used as the printing surface. Therefore, although Figure 10 shows the case where the base film 1w is below and the protective layer 5w is above (with the upper surface of the protective layer 5w serving as the printing surface), the order of the base film 1w and the protective layer 5w can be reversed as needed, i.e., the case where the base film 1w is above and the protective layer 5w is below (with the lower surface of the protective layer 5w serving as the printing surface).

[0098] Variations

[0099] Next, modifications to the present disclosure will be described, which mainly improve the adhesive-bonded composite layer. Specifically, please refer to FIG4, which is a schematic cross-sectional view of the adhesive-bonded composite layer 3' of a modification of the present disclosure.

[0100] First, as shown in Figure 4, the adhesive composite layer 3' includes, from top to bottom: an electromagnetic induction heating layer 31, an optional second adhesive layer 35, a bonding layer 36, an adhesive 321, and an adhesive film 322. The electromagnetic induction heating layer 31, the adhesive 321, and the adhesive film 322 are the same as in the previous embodiment, and will not be described again here.

[0101] Here, the bonding layer 36 is located between the electromagnetic induction heating layer 31 and the adhesive layer 32. Its material includes at least one of the group consisting of PET, PE, PP and PA, and its thickness is 12μm to 50μm. Through this bonding layer 36, the tensile strength of the adhesive composite layer 3' can be further improved.

[0102] Similarly, in one specific example, the bonding layer 36 and the electromagnetic induction heating layer 31 can be bonded together through a second adhesive layer 35. The second adhesive layer 35 can be a known adhesive, such as a dry composite adhesive, and is not particularly limited.

[0103] Furthermore, although not illustrated, the layers of this modified example can also be composited in various ways (such as adhesive, bonding, or connection).

[0104] Fourth Implementation Form

[0105] Next, please refer to Figure 5A, which is a cross-sectional schematic diagram of a two-piece sealing gasket 400 according to another embodiment of the present disclosure. As shown in Figure 5A, the two-piece sealing gasket 400 according to another embodiment of the present disclosure includes, from top to bottom: a backing layer 1, a weak adhesive layer 2, a release layer 9, a surface film 4, a super adhesive 5, a bonding film 7, an optional first adhesive layer 8, and an adhesive-sealing composite layer 3 (which may be the electromagnetic induction heating layer 31 and the adhesive-sealing layer 32 mentioned above). In this embodiment, the above-mentioned layers may be the same as those described in the first to third embodiments, so their description is omitted.

[0106] The main difference between the fourth embodiment and the third embodiment is that the release zone is omitted, and the width of the coating of the super adhesive 5 is between 1 / 6 and 5 / 6 of the diameter of the two-piece sealing gasket. Therefore, without the need for a release zone, the two-piece sealing gasket can be conveniently designed while tearing it open with a pull tab.

[0107] Fifth Implementation Form

[0108] Next, please refer to Figures 5B and 5C, which are cross-sectional schematic diagrams of two-piece sealing gaskets 500 and 500' according to another embodiment of this disclosure. As shown in Figures 5B and 5C, the two-piece sealing gaskets 500 and 500' according to another embodiment of this disclosure include, from top to bottom: a backing layer 1, a weak adhesive layer 2, a release layer 9, a surface film 4, a connecting film 7, a strong adhesive layer 5A and a release block 6A, an electromagnetic induction heating layer 31, and an adhesive sealing layer 32. In Figure 5B, the release block 6A is located between the connecting film 7 and the strong adhesive layer 5A, while in Figure 5C, it is located between the strong adhesive layer 5A and the electromagnetic induction heating layer 31. In this embodiment, except for the strong adhesive layer 5A and the release block 6A, the above-mentioned layers are the same as those described in the first to fourth embodiments, so their description is omitted.

[0109] Strong adhesive layer and release block

[0110] As shown in Figures 5B to 5C, a strong adhesive layer 5A is located between the connecting film 7 and the electromagnetic induction heating layer 31. It can be used to composite the connecting film 7 and the electromagnetic induction heating layer 31, so that the peel strength after composite bonding between the connecting film 7 and the electromagnetic induction heating layer 31 is greater than 12N / 15mm. Because a release block 6A is also present between the connecting film 7 and the electromagnetic induction heating layer 31, and the release block 6A is made of an easily peelable material, the strong adhesive layer 5A can be further used to tightly bond the connecting film 7, the release block 6A, and the electromagnetic induction heating layer 31 together, and to achieve a peel strength greater than 12N / 15mm after composite bonding. In some embodiments, the strong adhesive layer 5A can be, for example, a dry composite adhesive, and the thickness of the dry composite adhesive is preferably 0.5μm to 6μm, but is not limited thereto. In other embodiments, the strong adhesive layer 5A may also be, for example, a hot melt adhesive. The material of the hot melt adhesive may be at least one selected from the group consisting of PE, PP, EMAA, EAA, EEA, EMAC, and EMMA, and the thickness of the hot melt adhesive is preferably 4μm to 50μm, but is not limited thereto. Therefore, through the configuration of the strong adhesive layer 5A, when the user pinches the lifting part described later and pulls it upwards to peel it off, it will be easier to pull up and peel off each layer of the two-piece sealing gaskets 500, 500' together.

[0111] The main difference between the fifth embodiment and the fourth embodiment is that the fifth embodiment combines the surface film 4, the strong adhesive layer 5A and the connecting film 7, and the connecting film 7 and the electromagnetic induction heating layer 31 are partially connected by the strong adhesive layer 5A, while the other parts are connected by the release block 6A, so as to produce an easy-to-peel effect.

[0112] In some embodiments, the release block (not shown) may also be located on the lower surface of the electromagnetic induction heating layer 31, i.e., between the electromagnetic induction heating layer 31 and the adhesive layer 32. The release block 6A may be made of at least one of the groups consisting of free wax, varnish, and silicone oil, and its thickness may be 0.5 μm to 40 μm. It may be located on the lower surface of the bonding film 7 or on the upper or lower surface of the electromagnetic induction heating layer 31. Because the release block 6A has an easily peelable material, the lifting portion 610 described later is less likely to be stuck to the electromagnetic induction heating layer 31 below, allowing the user to more easily lift the lifting portion. This makes it easier for each layer of the two-piece sealing gaskets 500, 500' to be pulled upwards with the lifting portion 610, thereby improving the ease of opening for the user.

[0113] Cutting the upper surface of a two-piece sealing gasket

[0114] Next, please refer to FIG11, which is a top view schematic diagram illustrating the two-piece sealing gasket 50 of this disclosure. In some embodiments, the shape of the two-piece sealing gasket 50 of this disclosure can be various geometric shapes such as circle, square, rectangle, rhombus, triangle, polygon, cone, or trapezoid. Taking FIG11 as an example, FIG11 discloses a circular two-piece sealing gasket 50.

[0115] As shown in Figure 11, the upper surface of the two-piece sealing gasket 50 may include a lifting portion 610, a lifting neck 620, a cutout area 630, and a peripheral area 640. In Figure 11, the lifting portion 610, the lifting neck 620, and the cutout area 630 are all located in the same half (upper half) of the two-piece sealing gasket 50, allowing manufacturers to utilize the other half for other design considerations to meet their design needs, thereby improving the manufacturer's design flexibility and / or the aesthetics of the sealing gasket. Specifically, the lifting portion 610 corresponds to the area enclosed by points a, b, c, d, and da; the lifting neck 620 corresponds to the area between points he and he; the cutout area 630 corresponds to the area enclosed by points a, b, c, e, f, d, and ga; and the peripheral area 640 corresponds to the area surrounding the lifting portion 610, the lifting neck 620, and the cutout area 630. The tear line 710 is equivalent to a line formed by connecting points aghi, while the cutout line 720 is equivalent to a line formed by connecting points abcdefga. Furthermore, the tear line 710 has at least one tearing and cutting point, the surface film corresponding to which the at least one tearing and cutting point is not completely cut in the vertical direction, and the surface film corresponding to the tear line other than the at least one tearing and cutting point is completely cut; while the cutout line 720 does not have a cutout line.

[0116] One end of the tear line 710 (i.e., point a) is connected to the lifting portion 610, while the other end of the tear line 710 (i.e., point i) is separated from the outermost ring OC of the two-piece sealing gasket 50 by a tear gap 715. In some embodiments, the tear gap 715 is greater than or equal to 0 mm, and the tear gap 715 is less than or equal to 20 mm. In the description herein, "tear gap" refers to "the shortest distance from one end of the tear line (i.e., relative to the other end connected to the lifting portion) to the outermost ring of the two-piece sealing gasket." In a preferred embodiment, the tear gap 715 is greater than or equal to 0 mm, and the tear gap 715 is less than or equal to 10 mm. Therefore, by configuring a tear gap 715 greater than 0 mm, when the user pinches the lifting part 610 and lifts it along the tear line 710, and after the end of the tear line 710 (i.e., point i) is torn off, the two-piece sealing gasket 50 will provide a buffering effect due to the termination of the tear line 710, thereby preventing the user from tearing off only part of the two-piece sealing gasket 50 (e.g., the lifting part 610 and the area above it) due to excessive force. This reminds the user to appropriately change their tearing force and direction to improve the integrity of the sealing gasket.

[0117] Additionally, as shown in Figure 11, the upper surface of the two-piece sealing gasket 50 is also provided with a tear-twist cutting line 730, which is equivalent to a line formed by connecting points d, j, and k. The tear line 710 is connected to one end of the lifting part 610 (i.e., point a), while the tear-twist cutting line 730 is connected to the other end of the lifting part 610 (i.e., point d), so that the tear line 710 and the tear-twist cutting line 730 are respectively set on the left and right sides of the hollow area 630. Therefore, through the configuration of the tear-off line 730, when the user pinches the lifting part 610 and lifts it along the tear line 710, and after it is torn at the end of the tear line 710 (i.e., point i), it not only provides a buffering effect due to the termination of the tear line 710, but also guides the user to further peel off the two-piece sealing gasket 50 along the tear-off line 730, thereby reminding the user to appropriately change their peeling force and direction to improve the integrity of peeling off the sealing gasket.

[0118] Furthermore, if the release stencil 6A is coated on the lower surface of the connecting film, the coating area of ​​the release stencil 6A is not less than the area corresponding to the lifting portion 610. Taking Figure 11 as an example, the coating area of ​​the release stencil 6A is not less than the first coating range 810 (not less than the lifting portion, i.e., the area enclosed by the dotted line in Figure 11). If the release stencil 6A is coated on the upper surface of the electromagnetic induction heating layer, the coating area of ​​the release stencil 6A is not less than the lifting portion 610 and the hollow area 630. Taking Figure 11 as an example, the coating area of ​​the release stencil 6A is not greater than the second coating range 820 (not less than the lifting portion and the hollow area, i.e., the area enclosed by the dotted line in Figure 11).

[0119] Furthermore, to make the embodiments covered by the two-piece sealing gasket of this disclosure clearer, this disclosure will further provide other specific examples to further illustrate other variations of the upper surface of the two-piece sealing gasket. Please refer to Figures 12A to 12C, which are top views illustrating other specific embodiments of the two-piece sealing gasket 50 of this disclosure. It should be noted that subsequent descriptions will focus on variations such as the lifting portion, lifting neck, cutout area, tear line, and tear spacing. Since the remaining content is substantially the same as that illustrated in Figure 11, it will not be repeated here.

[0120] As shown in Figure 12A, the upper surface of the two-piece sealing gasket 50 may include a lifting portion 610, a lifting neck 620, a hollow area 630, and a peripheral area 640. Specifically, taking Figure 11A as an example, the lifting portion 610 corresponds to the area enclosed by points abcda, the lifting neck 620 corresponds to the area between points ke, the hollow area 630 corresponds to the area enclosed by points abcdefghijkla, and the peripheral area 640 corresponds to the area surrounding the lifting portion 610, the lifting neck 620, and the hollow area 630. The functional layer of the two-piece sealing gasket 50 is provided with a tear line 710. Taking Figure 11A as an example, the tear line 710 is equivalent to a line formed by connecting points almnop. In this state, one end of the tear line 710 (i.e., point a) is connected to the lifting part 610, while the other end of the tear line 710 (i.e., point p) is separated from the outermost ring OC of the two-piece sealing gasket 50 by a tear gap 715.

[0121] As shown in Figure 12B, the upper surface of the two-piece sealing gasket 50 may include a lifting portion 610, a lifting neck 620, a hollow area 630, and a peripheral area 640. Specifically, taking Figure 12B as an example, the lifting portion 610 corresponds to the area enclosed by points abcda, the lifting neck 620 corresponds to the area between points ie, the hollow area 630 corresponds to the area enclosed by points abcdefghija, and the peripheral area 640 corresponds to the area surrounding the lifting portion 610, the lifting neck 620, and the hollow area 630. The functional layer of the two-piece sealing gasket 50 is provided with a tear line 710. Taking Figure 12B as an example, the tear line 710 is equivalent to a line formed by connecting points ajklm. In this state, one end of the tear line 710 (i.e., point a) is connected to the lifting part 610, while the other end of the tear line 710 (i.e., point m) is separated from the outermost ring OC of the two-piece sealing gasket 50 by a tear gap 715.

[0122] As shown in Figure 12C, the upper surface of the two-piece sealing gasket 50 may include a lifting portion 610, a lifting neck 620, a cutout area 630, and an outer perimeter area 640. Specifically, taking Figure 12C as an example, the lifting portion 610 corresponds to the area enclosed by points abcda, the lifting neck 620 corresponds to the area between points ie, the cutout area 630 corresponds to the area enclosed by points abcdefghija, and the outer perimeter area 640 corresponds to the area surrounding the lifting portion 610, the lifting neck 620, and the cutout area 630. The functional layer of the two-piece sealing gasket 50 is provided with a tear line 710. Taking Figure 12C as an example, the tear line 710 corresponds to the line connected by points ajkl. In this configuration, one end of the tear line 710 (i.e., point a) is connected to the lifting portion 610, while the other end of the tear line 710 (i.e., point l) is separated from the outermost ring OC of the two-piece sealing gasket 50 by a tear gap 715. In addition, the upper surface of the two-piece sealing gasket 50 is provided with a tear-twist cutting line 730. Taking Figure 12C as an example, the tear-twist cutting line 730 is equivalent to a line formed by the points dmnop.

[0123] Fabrication of two-piece sealing gaskets

[0124] Based on the following steps, a two-piece sealing gasket related to the first embodiment is manufactured.

[0125] First, a release layer is applied to the upper surface of the electromagnetic induction heating layer roll, and then hot melt adhesive is applied to the lower surface of the electromagnetic induction heating layer roll to create an adhesive composite layer roll.

[0126] Next, a weak adhesive is applied between the electromagnetic induction heating layer of the backing layer roll and the adhesive-bonded composite layer roll, followed by dry lamination or coating lamination to create a two-piece sealing gasket roll. Then, according to customer requirements, the two-piece sealing gasket roll is cut into two-piece sealing gaskets. Specifically, the peel strength between the two layers of material dry-laminated with adhesive is greater than 4 N / 15 mm; the peel strength between the two layers of material laminated with weak adhesive, measured according to ASTM D903 standard, is above 0.05 N / 15 mm and below 2.26 N / 15 mm.

[0127] In addition, by applying an adhesive to the lower surface of the electromagnetic induction heating layer roll and dry laminating it with the composite surface of the sealing film roll, and then curing it in a curing chamber for more than 24 hours, the sealing composite layer roll can be produced, thus creating a two-piece sealing gasket related to the second embodiment.

[0128] Therefore, the temperatures of the five sections of the upper drying tunnel of the dry laminating machine are 60℃~65℃, 65℃~70℃, 70℃~75℃, 75℃~80℃, and 80℃~85℃, respectively. The temperature of the laminating roller of the dry laminating machine is 50℃~60℃. The temperature of the curing chamber is 50℃~55℃.

[0129] On the other hand, a two-piece sealing gasket related to the third embodiment can be produced based on the following steps.

[0130] First, an adhesive is applied to the upper surface of the electromagnetic induction heating layer roll and then dry-laminated with the composite surface of the bonding film roll. After curing in a curing chamber for more than 24 hours, the first composite layer roll is produced.

[0131] Next, after applying adhesive to the lower surface of the first composite layer roll and dry laminating it with the laminating surface of the sealing film roll, it is placed in a curing chamber for more than 24 hours to produce the lower composite layer roll. Alternatively, hot melt adhesive can be directly applied to the lower surface of the first composite layer roll to produce the lower composite layer roll.

[0132] Furthermore, a release layer is applied to the upper surface of the surface film roll, followed by a release area (with a coating width between 1 / 6 and 5 / 6 times the diameter of the two-piece sealing gasket) applied to the lower surface of the surface film roll. A super-strong adhesive is then applied to the upper surface of the connecting film of the lower composite roll. Dry lamination is then performed, followed by curing in a curing chamber for at least 24 hours to produce the bottom layer roll. Additionally, when the diameter D of the two-piece sealing gasket 300 is relatively large, the cross-sectional width W of the coating area of ​​the super-strong adhesive 5 can be increased; conversely, when the diameter D of the two-piece sealing gasket 300 is relatively small, the cross-sectional width W of the coating area of ​​the super-strong adhesive 5 can be reduced.

[0133] Then, a weak adhesive is applied between the lower surface of the cardboard roll and the upper surface of the surface film of the bottom roll, and dry lamination or coating lamination is performed to produce a two-piece sealing gasket roll. Then, it is cut into two-piece sealing gaskets according to the customer's size requirements.

[0134] Specifically, the peel strength between two layers of material dry-laminated with adhesive (e.g., the first and second adhesive layers) is greater than 4 N / 15 mm; the peel strength between two layers of material dry-laminated with weak adhesive, as measured by ASTM D903 standard, is greater than 0.05 N / 15 mm and less than 2.26 N / 15 mm; and the peel strength between two layers of material dry-laminated with super-strong adhesive is greater than 17.8 N / 15 mm.

[0135] Based on the third embodiment, if the release area is not coated and the width of the super-adhesive coating is between 1 / 6 and 5 / 6 times the diameter of the two-piece sealing gasket, a two-piece sealing gasket related to the fourth embodiment can be manufactured. Furthermore, the coating area of ​​the super-adhesive can be increased or decreased as described above.

[0136] In addition, modified adhesive composite layers can be produced by referring to the above-mentioned dry lamination method or known lamination methods.

[0137] Therefore, the temperatures of the five sections of the upper drying tunnel of the dry laminating machine are 60℃~65℃, 65℃~70℃, 70℃~75℃, 75℃~80℃, and 80℃~85℃, respectively. The temperature of the laminating roller of the dry laminating machine is 50℃~60℃. The temperature of the curing chamber is 50℃~55℃.

[0138] In addition, regarding the method of lamination, the aforementioned dry lamination method or known methods such as adhesive bonding or pressing can be used, without any particular restrictions.

[0139] On the other hand, regarding the cutting method, a release liner (not shown) can be applied to the lower surface of the connecting film roll, and then a cutting die can be used to cut the two-piece sealing gasket roll with a printed pattern (such as the pattern in Figure 11) to create tear lines, cutout lines, cutout areas, and tear-twist lines. The coating area of ​​the release liner is not less than the lifting portion, and the thickness of the cutout area is equal to the composite portion of the electromagnetic induction heating layer and the adhesive sealing layer, and less than the overall thickness of the two-piece sealing gasket.

[0140] The release block can be made of at least one of the following materials: free wax, clear varnish and silicone oil, and its thickness can be 0.5μm to 40μm.

[0141] Production of wireless information integration sheet rolls

[0142] Based on the following steps, a preferred embodiment of the wireless information integration sheet roll of this disclosure is produced. The wireless information integration sheet roll described herein can be used as an embodiment of the aforementioned electromagnetic induction heating layer roll in the process of producing the aforementioned two-piece sealing gasket roll.

[0143] First, a composite adhesive (first adhesive layer) is applied to the composite surface of the base film roll, and then laminated with the composite surface of the metal foil roll to create a wireless information integrated circuit preform roll. Second, the metal foil of the wireless information integrated circuit preform roll is etched to connect the antenna and chip electrically. Then, chip encapsulation protective adhesive is used with a dispensing machine to encapsulate the chip and the bonding wires connecting the chip and antenna. At this point, the metal foil of the wireless information integrated circuit preform roll forms the information and heating layers, and the wireless information integrated circuit preform roll becomes a wireless information integrated circuit roll.

[0144] The peel strength between the two layers of materials bonded by the composite adhesive is greater than 4N / 15mm.

[0145] In addition, if a battery is to be added to the information and heating layer, a welding machine or conductive adhesive can be used to process the battery cells and the chip into an electrical connection.

[0146] On the other hand, based on the aforementioned wireless information integrated sheet roll, a dry composite adhesive (second adhesive layer) is applied to the composite surface of the protective layer roll, and the information of the wireless information integrated sheet roll is dry-laminated with the surface of the heating layer (the surface away from the base film). After curing in a curing chamber for more than 24 hours, another embodiment of the wireless information integrated sheet roll can be produced.

[0147] It should be noted that the above description is only a specific example, and the manufacturing order of the above layers is not particularly limited. Although the manufacturing of the two-piece sealing gasket of the first to fourth embodiments is mainly described here, the adhesive-sealing composite layer of the modified embodiment can also be used as a substitute for the adhesive-sealing composite layer in the above embodiments, and other composite methods (adhesion, bonding, coating, film coating or connection, etc.) can be used as substitutes for dry composite.

[0148] This disclosure is not limited to the above-described embodiments. Various modifications can be made within the scope indicated in the claims. Furthermore, embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included within the technical scope of this disclosure.

[0149]

Symbol Explanation

Claims

1. A two-piece sealing gasket, comprising: Backing layer, which is cardboard or foam board film; The adhesive composite layer, from top to bottom, includes an electromagnetic induction heating layer and an adhesive layer; A weak adhesive layer is located between the backing layer and the adhesive-sealing composite layer, such that the peel strength between the backing layer and the adhesive-sealing composite layer is greater than 0.05 N / 15 mm and less than 2.26 N / 15 mm.

2. The two-piece sealing gasket according to claim 1 further includes a release layer located below the weak adhesive layer, the release layer being made of a varnish or silicone oil that is fully coated or dotted.

3. The two-piece sealing gasket according to claim 1 further includes a barrier layer located above the weak adhesive layer, the barrier layer being made of at least one material selected from the group consisting of PET, polyamide (PA), polyvinylidene chloride (PVDC), and ethylene-vinyl alcohol copolymer (EVOH).

4. The two-piece sealing gasket according to any one of claims 1 to 3, wherein, The material of the weak adhesive layer includes polyolefin; or, the material of the weak adhesive layer includes polyurethane; or, the material of the weak adhesive layer includes wax, and the coating method of the weak adhesive layer is dot coating or full-area coating.

5. The two-piece sealing gasket according to any one of claims 1 to 3, wherein, The sealing layer is a hot melt adhesive or a combination of a sealing film and an adhesive, and the hot melt adhesive is selected from polyethylene (PE), polypropylene (PP), ethylene / vinyl acetate copolymer (EVA), polyisobutylene (PIB), ethylene-ethyl acrylate (EEA), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-methyl acrylate copolymer (EMAC), polyacrylate, polyacetate, and ethylene-butyl acrylate. The adhesive is selected from at least one of the group consisting of acrylate (EBA); the sealing film is selected from at least one of the group consisting of paper, polyethylene (PE), polypropylene (PP), polyamide (PA), polyvinylidene chloride (PVDC), ethylene vinyl alcohol copolymer (EVOH), and polyethylene terephthalate (PET); the adhesive is located between the electromagnetic induction heating layer and the sealing film.

6. The two-piece sealing gasket according to claim 1, wherein, Between the weak adhesive layer and the electromagnetic induction heating layer, the following are further included in sequence: The surface film comprises at least one of the following groups: PP, PET, PE, polyamide (PA), PEN and polyimide (PI); Super strong adhesive; The bonding membrane, which is bonded to the surface membrane by the super-strong adhesive, and whose components include at least one of the group consisting of PET, PE, PP, PA, EPP and EPE; and This super-strong adhesive results in a peel strength greater than 17.8 N / 15 mm between the surface film and the bonding film.

7. The two-piece sealing gasket according to claim 2, wherein, Between the release layer and the electromagnetic induction heating layer, the following are further included in sequence: The surface film comprises at least one of the following groups: PP, PET, PE, polyamide (PA), PEN and polyimide (PI); Super strong adhesive; The bonding membrane, which is bonded to the surface membrane by the super-strong adhesive, and whose components include at least one of the group consisting of PET, PE, PP, PA, EPP and EPE; and This super-strong adhesive results in a peel strength greater than 17.8 N / 15 mm between the surface film and the bonding film.

8. The two-piece sealing gasket according to claim 6 or 7, wherein, It also includes a flap layer, which is bonded to the underside of the surface film by a super-strong adhesive, and its composition includes at least one of the group consisting of paper, PET, PP, PA, PEN and PI, and the width of the flap layer is between 1 / 6 and 5 / 6 times the diameter of the two-piece sealing gasket.

9. The two-piece sealing gasket according to claim 6 or 7, wherein, The super adhesive is made of dry composite adhesive or hot melt laminate, and the hot melt laminate is made of at least one of the group consisting of PE, PP, EMAC, EMAA, EEA, EAA and EMMA.

10. The two-piece sealing gasket according to claim 8, wherein, The super adhesive is made of dry composite adhesive or hot melt laminate, and the hot melt laminate is made of at least one of the group consisting of PE, PP, EMAC, EMAA, EEA, EAA and EMMA.

11. The two-piece sealing gasket according to any one of claims 1 to 3, 6, and 7, wherein, The backing layer has a polyolefin coating layer on the side facing the electromagnetic induction heating layer, and the polyolefin is at least one of the group consisting of polyethylene, polypropylene, polypentene and polyhexene.

12. The two-piece sealing gasket according to any one of claims 1 to 3, wherein, The electromagnetic induction heating layer is made of aluminum foil or a wireless information integration sheet.

13. The two-piece sealing gasket according to claim 12, wherein, The wireless information integration chip includes: Base film; Information and heating layer, comprising an information area and an electromagnetic induction heating ring; and A first adhesive layer is located between the base film and the information and heating layer; The information area has interconnected antennas and chips, and the electromagnetic induction heating ring surrounds the information area from a planar perspective.

14. The two-piece sealing gasket according to claim 13, wherein, The wireless information integration chip also includes: A protective layer, located on the side of the information and heating layer away from the base film; and The second adhesive layer is located between the information layer, the heating layer, and the protective layer.

15. The two-piece sealing gasket according to claim 13, wherein, There is a gap between the electromagnetic induction heating ring and the information area.

16. The two-piece sealing gasket according to claim 13, wherein, The electromagnetic induction heating ring is filled with gaps between itself and the information area.

17. The two-piece sealing gasket according to claim 15, wherein, The interval is the distance between the outermost edge of the information area and the innermost edge of the electromagnetic induction heating ring, and the distance is between 0.1 mm and 3 mm.

18. The two-piece sealing gasket according to claim 13, wherein, The information and heating layer also includes at least one physical connection bridge for connecting the information area with the electromagnetic induction heating ring.

19. The two-piece sealing gasket according to claim 1, wherein, Between the weak adhesive layer and the sealant layer, the following are further included in sequence: The surface film is composed of at least one of the group consisting of PP, PET, PE, PA, PEN and PI. The connecting membrane comprises at least one of the following components: PET, PE, PP, PA, EPP, and EPE; and Strong adhesive layer; in addition, The two-piece sealing gasket also includes a release block, the material of which is selected from at least one of the group consisting of wax, varnish and silicone oil, and the release block is located on the lower surface of the bonding film or on the upper or lower surface of the electromagnetic induction heating layer. The strong adhesive layer is a dry composite adhesive or a hot melt composite adhesive, and the peel strength between the bonding film and the electromagnetic induction heating layer is greater than 12N / 15mm.

20. The two-piece sealing gasket according to claim 2, wherein, Between the release layer and the electromagnetic induction heating layer, the following are further included in sequence: The surface film is composed of at least one of the group consisting of PP, PET, PE, PA, PEN and PI. The connecting membrane comprises at least one of the following components: PET, PE, PP, PA, EPP, and EPE; and Strong adhesive layer; in addition, The two-piece sealing gasket also includes a release block, the material of which is selected from at least one of the group consisting of wax, varnish and silicone oil, and the release block is located on the lower surface of the bonding film or on the upper or lower surface of the electromagnetic induction heating layer. The strong adhesive layer is a dry composite adhesive or a hot melt composite adhesive, and the peel strength between the bonding film and the electromagnetic induction heating layer is greater than 12N / 15mm.

21. The two-piece sealing gasket according to claim 19 or 20, wherein, The upper surface of the two-piece sealing gasket includes: Lifting section; Lift the neck; and The hollow area is cut by a hollow cutting line. The hollow area is located on the periphery of the lifting part and is connected to both sides of the lifting neck. The thickness of the two-piece sealing gasket corresponding to the hollow area is less than the overall thickness of the two-piece sealing gasket. The upper surface of the two-piece sealing gasket is provided with a tear line. One end of the tear line is connected to the lifting part, and the other end of the tear line is separated from the outermost ring of the two-piece sealing gasket by a tear gap. The tear gap is greater than or equal to 0mm and less than or equal to 20mm. The tear line has at least one tear-cutting point, the surface film corresponding to the at least one tear-cutting point is not completely cut in the vertical direction, and the surface film corresponding to the tear line other than the at least one tear-cutting point is completely cut; and The release block is located on the lower surface of the connecting film corresponding to the lifting part, and the coating area of ​​the release block is not smaller than the lifting part; or the release block is located on the upper or lower surface of the electromagnetic induction heating layer corresponding to the lifting part, the lifting neck and the hollow area, and the coating area of ​​the release block is not smaller than the lifting part and the hollow area.

22. The two-piece sealing gasket according to claim 21, wherein, The lifting section, the lifting neck, and the hollow area are all located in the same half of the two-piece sealing gasket. The upper surface of the two-piece sealing gasket is also provided with a tear-twist cutting line, which is connected to the lifting section. The tear line and the tear-twist cutting line are respectively connected to both ends of the lifting section.

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