Two-piece type sealing gasket

Abstract

The invention discloses a two-piece type sealing gasket which comprises a backing layer, a weak adhesive layer and an adhesive sealing composite layer which are sequentially arranged from top to bottom. The backing layer is a paperboard or a foam board film; the adhesive sealing composite layer comprises an electromagnetic induction heating layer and an adhesive sealing layer which are sequentially arranged from top to bottom; the weak adhesive layer is located between the backing layer and the adhesive sealing composite layer, and the weak adhesive layer enables the peel strength between the backing layer and the adhesive sealing composite layer to be more than 0.05 N / 15mm and less than 2.26 N / 15mm. According to the invention, the backing layer and the adhesive sealing composite layer can be easily separated.

Description

Technical Field

[0001] The invention relates to the field of sealing gaskets, in particular to a two-piece sealing gasket. Background Art

[0002] In a general two-piece sealing gasket (especially a sealing gasket comprising cardboard and aluminum foil), the two-piece sealing gasket includes cardboard, wax layer, aluminum foil and heat-sealing adhesive layer from top to bottom. After electromagnetic induction heating, the coating (coating amount is about 25~40g / m 2 ) will be melted and absorbed by the paperboard, while the aluminum foil is sealed to the container mouth by the heat-sealing adhesive layer, and the paperboard is stuck in the bottle cap.

[0003] However, in the conventional two-piece sealing gasket, although most of the wax layer will be 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, it is often seen that there is still residual wax on the bottle mouth sticking to the aluminum foil, or the cardboard sticking to the aluminum foil and cannot be separated, which creates a very bad user experience. Moreover, in order to reseal, even if the cardboard is stuffed back into the bottle cap with fingers, not only will the fingers contaminate the cardboard, but the cardboard left in the bottle cap will also have no re-seal function, and the cardboard can neither block oxygen nor moisture.

[0004] In view of the existence of the above problems, it is necessary to study a two-piece sealing gasket to solve at least one of the above problems. Summary of the invention

[0005] The object of the present invention is to provide a two-piece sealing gasket to solve at least one of the above problems; preferably, the two-piece sealing gasket can make the backing layer and the adhesive sealing composite layer easily separated.

[0006] In order to achieve the above object, the solution of the present invention is: A two-piece sealing gasket comprises a backing layer, a weak adhesive layer and an adhesive-sealing composite layer which are arranged in sequence from top to bottom; the backing layer is a paperboard or a foamed board film; the adhesive-sealing composite layer comprises an electromagnetic induction heating layer and an adhesive-sealing layer which are arranged in sequence from top to bottom; the weak adhesive layer is located between the backing layer and the adhesive-sealing composite layer, and the weak adhesive layer makes the peeling strength between the backing layer and the adhesive-sealing composite layer be greater than 0.05N / 15mm and less than 2.26N / 15mm.

[0007] The two-piece sealing gasket further comprises a release layer, which is located below the weak adhesive layer, has a thickness of 0.5-20 µm, and is made of varnish or silicone oil that is fully or dot-coated on the release layer.

[0008] The two-piece sealing gasket also includes a surface film, a super strong adhesive and a connecting film which are arranged in sequence between the release layer and the electromagnetic induction heating layer. The super strong adhesive is a dry composite adhesive or a hot melt laminating adhesive. The material of the hot melt laminating adhesive is one of PE, PP, EMAC, EMAA, EEA, EAA and EMMA, and the thickness of the hot melt laminating adhesive is 4~100µm. The super strong adhesive makes the peel strength between the surface film and the connecting film greater than 17.8N / 15mm; the surface film includes at least one of a PP layer, a PET layer, a PE layer, a PA layer, a PEN layer and a PI layer, and the thickness of the surface film is 12~150µm; the connecting film includes at least one of a PET layer, a PE layer, a PP layer, a PA layer, an EPP layer and an EPE layer, and the thickness of the connecting film is 12~200µm.

[0009] The two-piece sealing gasket also includes a surface film, a connecting film and a strong adhesive which are sequentially arranged between the release layer and the electromagnetic induction heating layer; the strong adhesive is a dry composite adhesive or a hot-melt laminating adhesive, the material of the hot-melt laminating adhesive is one of PE, PP, EMAC, EMAA, EEA, EAA and EMMA, and the thickness of the hot-melt laminating adhesive is 4-100µm, and the strong adhesive makes the peeling strength between the connecting film and the electromagnetic induction heating layer greater than 12N / 15mm; the surface film includes a PP layer, a PET layer, At least one of a PE layer, a PA layer, a PEN layer and a PI layer, and the thickness of the surface film is 12-150µm; the connecting film includes at least one of a PET layer, a PE layer, a PP layer, a PA layer, an EPP layer and an EPE layer, and the thickness of the connecting film is 12-200µm; the lower surface of the connecting film is equipped with a release block, or the upper surface or the lower surface of the electromagnetic induction heating layer is equipped with a release block; the material of the release block is one of wax, varnish and silicone oil, and the thickness of the release block is 0.5-40µm.

[0010] The two-piece sealing gasket also includes a barrier layer, which is located above the weak adhesive layer. The material of the barrier layer includes at least one of a PET layer, a PA layer, a PVDC layer and an EVOH layer, and the thickness of the barrier layer is 12-100 μm.

[0011] The material of the weak adhesive layer is polyolefin, and the thickness is 4~100µm; or, the material of the weak adhesive layer is polyurethane, and the thickness is 0.5~6µm; or, the material of the weak adhesive layer is wax, and the coating method of the weak adhesive layer is dot coating or full coating, and the coating amount is 1~40g / m2.

[0012] The thickness of the paperboard is 0.2-2 mm; or, the foamed board film is an EPE layer or an EPP layer, and the thickness of the foamed board film is 0.2-3 mm.

[0013] The upper surface of the electromagnetic induction heating layer is provided with a printing layer with a thickness of 1 to 20 μm.

[0014] The sealing layer is a hot melt adhesive; or, the sealing layer includes a composite sealing film and an adhesive, and the adhesive is located between the electromagnetic induction heating layer and the sealing film; the hot melt adhesive is made of one of PE, PP, EVA, PIB, EEA, EAA, EMAA, EMMA, polyacrylate, acrylic copolymer, EBA and EMAC, and the thickness of the hot melt adhesive is 4~100µm; the sealing film includes at least one of paper, PE layer, PP layer, PA layer, PVDC layer, EVOH layer and PET layer, and the thickness of the sealing film is 12~100µm.

[0015] The two-piece sealing gasket also includes a surface film, a super strong adhesive and a connecting film which are sequentially arranged between the weak adhesive layer and the electromagnetic induction heating layer, the super strong adhesive is a dry composite adhesive or a hot melt laminating adhesive, and the super strong adhesive makes the peel strength between the surface film and the connecting film greater than 17.8N / 15mm; the surface film includes at least one of a PP layer, a PET layer, a PE layer, a PA layer, a PEN layer and a PI layer, and the thickness of the surface film is 12~150µm; the connecting film includes at least one of a PET layer, a PE layer, a PP layer, a PA layer, an EPP layer and an EPE layer, and the thickness of the connecting film is 12~200µm.

[0016] The two-piece sealing gasket also includes a release zone, which is located below the surface film. The thickness of the release zone is 0.5~20µm. The release zone includes varnish or silicone oil, and the coating width of the release zone is between 1 / 6 and 5 / 6 times the diameter of the two-piece sealing gasket.

[0017] The coating width of the super strong adhesive is between 1 / 6 and 5 / 6 of the diameter of the two-piece sealing gasket.

[0018] The material of the super strong adhesive is dry composite glue, and the thickness of the super strong adhesive is 1~7µm.

[0019] The material of the super strong adhesive is hot melt laminating adhesive, the material of the hot melt laminating adhesive is one of PE, PP, EMAC, EMAA, EEA, EAA and EMMA, and the thickness of the hot melt laminating adhesive is 4~50µm.

[0020] The two-piece sealing gasket also includes a surface film, a connecting film and a strong adhesive which are sequentially arranged between the weak adhesive layer and the electromagnetic induction heating layer. The strong adhesive is a dry composite adhesive or a hot-melt laminating adhesive. The strong adhesive makes the peel strength between the connecting film and the electromagnetic induction heating layer greater than 12N / 15mm; the surface film includes at least one of a PP layer, a PET layer, a PE layer, a PA layer, a PEN layer and a PI layer, and the thickness of the surface film is 12~150µm; the connecting film includes at least one of a PET layer, a PE layer, a PA layer, a PP layer, an EPP layer and an EPE layer, and the thickness of the connecting film is 12~200µm; the lower surface of the connecting film is equipped with a release block, or the upper surface or the lower surface of the electromagnetic induction heating layer is equipped with a release block; the material of the release block is one of wax, varnish and silicone oil, and the thickness of the release block is 0.5~40µm.

[0021] The material of the hot melt laminating adhesive is one of PE, PP, EMAC, EMAA, EEA, EAA and EMMA.

[0022] The upper surface of the two-piece sealing gasket includes a lifting portion, a lifting neck and a hollow area; the hollow area is cut by a hollow cutting line, the hollow area is located at the periphery of the lifting portion and the hollow area is connected to both sides of the lifting neck; the thickness of the part 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 also 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 circle of the two-piece sealing gasket by a tearing distance, the tearing distance is greater than or equal to 0mm, and the tearing distance is less than or equal to 20mm; The tear line is provided with at least one tearing and cutting point, the surface film corresponding to the tearing and cutting point is not completely cut in the vertical direction, and the surface film corresponding to the tear line except for the tearing and cutting points is completely cut; and a release block is also included between the connecting film and the electromagnetic induction heating layer; the release block is located on the lower surface of the connecting film portion corresponding to the lifting portion, and the coating area of ​​the release block is not smaller than the lifting portion; or, the release block is located on the upper surface or lower surface of the electromagnetic induction heating layer portion corresponding to the lifting portion, the lifting neck and the hollow area, and the coating area of ​​the release block is not smaller than the lifting portion and the hollow area.

[0023] The lifting portion, lifting neck and 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 portion, and the tear line and the tear-twist cutting line are respectively connected to the two ends of the lifting portion.

[0024] A polyolefin coating layer is arranged on the side of the backing layer facing the weak adhesive layer, and the polyolefin coating layer comprises at least one of a polyethylene layer, a polypropylene layer, a polypentene layer and a polyhexene layer, and the thickness of the polyolefin coating layer is 4-100 μm.

[0025] The electromagnetic induction heating layer is aluminum foil or a wireless information integrated sheet.

[0026] The wireless information integrated sheet comprises a base film, an information and heating layer and a first adhesive layer; the information and heating layer comprises an information area and an electromagnetic induction heating ring, the information area has an antenna and a chip that are connected to each other, and the electromagnetic induction heating ring surrounds the information area; the first adhesive layer is located between the base film and the information and heating layer.

[0027] The wireless information integrated sheet also includes a protective layer and a second adhesive layer: the protective layer is located on the side of the information and heating layer away from the base film; the second adhesive layer is located between the information and heating layer and the protective layer.

[0028] There is a gap between the electromagnetic induction heating ring and the information area.

[0029] The interval between the electromagnetic induction heating ring and the information area is 0.1mm to 3mm.

[0030] There is a full space between the electromagnetic induction heating ring and the information area.

[0031] The information and heating layer also includes at least one physical connection bridge, which connects the information area and the electromagnetic induction heating ring.

[0032] After adopting the above scheme, the backing layer and the adhesive composite layer of the two-piece sealing gasket of the present invention are compounded by a weak adhesive layer, so that the peel strength between the backing layer and the adhesive composite layer is greater than 0.05N / 15mm and less than 2.26N / 15mm. In this way, when the adhesive layer of the adhesive composite layer is bonded to the container mouth of the product container by electromagnetic induction heating to seal, the peel strength between the backing layer and the adhesive composite layer is less than the clamping strength of the backing layer (for example, cardboard) stuck in the gasket slot in the bottle cap (the clamping strength of the backing layer stuck in the gasket slot in the bottle cap is preferably more than 2 times the peel strength between the backing layer and the adhesive composite layer), and the peel strength between the backing layer and the adhesive composite layer is also less than the adhesion strength between the adhesive composite layer and the container mouth (the adhesion strength between the adhesive composite layer and the container mouth is preferably more than 2 times the peel strength between the backing layer and the adhesive composite layer), so that the backing layer and the adhesive composite layer can be easily separated.

[0033] It should be noted that after the two-piece sealing gasket of the present invention is sealed, the peel strength between the backing layer (paperboard or foamed board film) and the electromagnetic induction heating layer is greater than 0.05N / 15mm and less than 2.26N / 15mm. In this way, if electromagnetic induction heating is used for sealing, the energy required for electromagnetic induction heating for sealing is no longer consumed in the melting and absorption of the wax layer, which can achieve the effect of reducing carbon and saving energy consumption.

[0034] It should also be noted that, in this case, even if electromagnetic induction sealing is not used, and instead the method of applying glue to the container mouth to bond the sealing layer to the container mouth is used, 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 slot in the bottle cap, and is also less than the glue bonding strength between the sealing layer and the container mouth. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of a two-piece sealing gasket according to the first embodiment of the present invention.

[0036] Figure 2 It is a schematic structural diagram of a two-piece sealing gasket according to the second embodiment of the present invention.

[0037] Figure 3 The structure of the two-piece sealing gasket of the third embodiment of the present invention is shown in FIG. Figure 1 .

[0038] Figure 4 The structure of the two-piece sealing gasket of the third embodiment of the present invention is shown in FIG. Figure 2 .

[0039] Figure 5 The structure of the two-piece sealing gasket of the third embodiment of the present invention is shown in FIG. Figure 3 .

[0040] Figure 6 This is a schematic structural diagram of a two-piece sealing gasket according to a fourth embodiment of the present invention.

[0041] Figure 7 This is a schematic structural diagram of a two-piece sealing gasket according to a fifth embodiment of the present invention.

[0042] Figure 8 This is a schematic structural diagram of a two-piece sealing gasket according to a sixth embodiment of the present invention.

[0043] Fig. 9 This is a schematic structural diagram of a two-piece sealing gasket according to Embodiment 7 of the present invention.

[0044] Fig.10 It is a cross-sectional schematic diagram of the first embodiment of the wireless information integrated chip of the present invention.

[0045] Fig.11 This is a plan view of the information and heating layer of the first embodiment of the wireless information integrated sheet of the present invention.

[0046] Fig.12 This is a plan view of the information area of ​​the first embodiment of the wireless information integrated sheet of the present invention.

[0047] Fig.13It is a cross-sectional schematic diagram of a second embodiment of the wireless information integrated chip of the present invention.

[0048] Fig.14 This is a plan view of the information and heating layer of the third embodiment of the wireless information integrated sheet of the present invention.

[0049] Fig.15 This is a schematic plan view of the information area of ​​the third embodiment of the wireless information integrated chip of the present invention.

[0050] Description of labels: Backing layer 1, weak adhesive layer 2, adhesive composite layer 3, electromagnetic induction heating layer 31, adhesive layer 32, adhesive 321, adhesive film 322, second adhesive layer 35, bonding layer 36, surface film 4, super strong adhesive 5, strong adhesive 5A, release area 6, release block 6A, connecting film 7, first adhesive layer 8, release layer 9, lifting part 610, lifting neck 620, hollow area 630, peripheral area 640, tear line 710, Tear spacing 715, hollow cutting line 720, tear and twist cutting line 730, first coating range 810, second coating range 820, base film 1w, first adhesive layer 2w, information and heating layer 3w, information area 31w, electromagnetic induction heating ring 32w, chip 311w, antenna 312w, physical connection bridge 33w, second adhesive layer 4w, protective layer 5w, diameter D, interval ITV, outermost circle OC, coating horizontal width W. DETAILED DESCRIPTION

[0051] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0052] Embodiment 1: Cooperate Figure 1 As shown, in embodiment 1 of the present invention, the two-piece sealing gasket of the present invention includes a backing layer 1, a weak adhesive layer 2 and a sealing composite layer 3; wherein the backing layer 1 is a cardboard or a foam board film; the sealing composite layer 3 includes an electromagnetic induction heating layer 31 and a sealing layer 32 arranged in sequence from top to bottom; the weak adhesive layer 2 is located between the backing layer 1 and the sealing composite layer 3, and the weak adhesive layer 2 makes the peel strength between the backing layer 1 and the sealing composite layer 3 be greater than 0.05N / 15mm and less than 2.26N / 15mm.

[0053] In the first embodiment of the present invention, the backing layer 1 is one of the sealing layers of the two-piece sealing gasket. The backing layer 1 has at least one polyolefin coating layer (not shown) on the side facing the weak adhesive layer 2, so it can effectively isolate oxygen and moisture, and can produce a further sealing effect. Specifically, when the bottle cap is opened after electromagnetic induction sealing, the backing layer 1 stuck in the bottle cap can produce a resealing effect because of the polyolefin coating layer to prevent the contents from spoiling, getting damp, etc. In addition, the polyolefin coating layer includes at least one of a polyethylene layer, a polypropylene layer, a polypentene layer and a polyhexene layer, and the thickness of the polyolefin coating layer is 4~100µm, thereby making the contents in the container less susceptible to moisture and oxygen. The backing layer 1 can be a cardboard or a foamed board film, and the thickness of the cardboard can be 0.2~2mm; in addition, the foamed board film is an EPE layer or an EPP layer, and the thickness of the foamed board film is 0.2~3mm.

[0054] In the first embodiment of the present invention, the weak adhesive layer 2 is used to compound the backing layer 1 and the adhesive composite layer 3. Specifically, the weak adhesive layer 2 compounds the lower surface of the backing layer 1 (e.g., the lower surface of the paperboard) with the upper surface of the adhesive composite layer 3 (e.g., the upper surface of the electromagnetic induction heating layer 31). The weak adhesive layer 2 makes the peel strength between the backing layer 1 and the adhesive composite layer 3 greater than 0.05N / 15mm and less than 2.26N / 15mm; thereby, after electromagnetic induction heating, the backing layer 1 (e.g., paperboard) and the electromagnetic induction heating layer 31 in the adhesive composite layer 3 can be formed into a two-piece detachable sealing gasket. Specifically, the electromagnetic induction heating layer 31 is sealed and attached to the container mouth by the adhesive layer 32, and the backing layer 1 is stuck in the bottle cap.

[0055] The material of the weak adhesive layer 2 may be polyolefin, including but not limited to polyethylene, polypropylene, polypentene, polyhexene, etc., and the thickness is 4-100µm. Alternatively, the material of the weak adhesive layer 2 is polyurethane, and the thickness is 0.5-6µm. Alternatively, the material of the weak adhesive layer 2 is wax, and the coating method of the weak adhesive layer 2 is dot coating or full coating, and the coating amount is 1-40g / m 2 , preferably 1~9g / m 2 The coating amount of the weak adhesive layer can be adjusted according to the diameter of the sealing gasket. For example, a sealing gasket with a diameter less than 40 mm can be matched with a larger coating amount (for example, 1~40g / m 2 ), the sealing gasket with a diameter of 40mm~60mm can be matched with a smaller coating amount (for example, 1~9g / m 2 ), sealing gaskets with a diameter greater than 60 mm can be matched with a smaller coating amount (for example, 1~5g / m 2 ), thereby reducing the energy consumed in absorbing the wax of the weak adhesive layer 2.

[0056] In the first embodiment of the present invention, the two-piece sealing gasket of the present invention further includes a release layer 9, which is not an essential structure; the release layer 9 is located below the weak adhesive layer 2 and above the electromagnetic induction heating layer 31. The release layer 9 can be made of silicone oil or varnish that is fully coated or dot-coated, and the thickness of the release layer 9 is 0.5-20 μm. The release layer 9 can improve the convenience of the user to tear it open.

[0057] In the first embodiment of the present invention, the electromagnetic induction heating layer 31 of the sealing composite layer 3 is an aluminum foil film of 6~40µm, which can make the contents in the container less susceptible to moisture and oxygen. In addition, the upper surface of the aluminum foil layer can be provided with a printed layer with a rear end of 1~20µm (not shown). It should be noted that the present invention can use the wireless information integrated sheet described later as the electromagnetic induction heating layer, which can effectively reduce the amount of aluminum foil and reduce energy consumption. Specifically, by using the wireless information integrated sheet of the present invention, the function of wireless information transmission can be increased, and the waste of aluminum foil materials can be reduced, energy consumption can be reduced, waste of manpower can be avoided, interference from metal and liquid can be avoided, production efficiency can be improved, communication performance is good and communication distance is greatly improved, thereby greatly improving the automation, digitization and intelligent development of factories, warehouses, logistics, stores, and unmanned cashier management.

[0058] In the first embodiment of the present invention, the sealing layer 32 of the sealing composite layer 3 is mainly used to seal the container mouth; the sealing layer 32 can be a hot melt adhesive with a thickness of 4 to 100 µm, and the material of the hot melt adhesive is one of PE, PP, EVA, PIB, EEA, EAA, EMAA, EMMA, polyacrylate, acrylic copolymer, EBA and EMAC. The hot melt adhesive does not require the use of adhesives, and can achieve a continuous sealing effect even when the contents of the glass container contain water, and can also achieve a continuous sealing effect when the contents of the glass container contain spicy additives, honey, garlic and chili.

[0059] In the first embodiment of the present invention, the two-piece sealing gasket of the present invention may further include a barrier layer (not shown). The barrier layer is located above the weak adhesive layer, and the barrier layer includes at least one of a PET layer, a PA layer, a PVDC layer, and an EVOH layer, and the thickness of the barrier layer is 12-100 μm. With this barrier layer, moisture and oxygen can be further blocked.

[0060] The manufacturing method of the two-piece sealing gasket of the first embodiment of the present invention is as follows: First, a release layer is applied on the upper surface of the electromagnetic induction heating layer coil, and then a hot melt adhesive is applied on the lower surface of the electromagnetic induction heating layer coil to make a sealing composite layer coil; Next, a weak adhesive is applied between the surface of the electromagnetic induction heating layer of the backing layer coil and the sealing composite layer coil, and dry lamination or coating lamination is performed to produce a two-piece sealing gasket coil; Then, the two-piece sealing gasket roll is cut into two-piece sealing gaskets according to the size required by the customer.

[0061] Among them, the peel strength between the two layers of materials dry-laminated by adhesive is greater than 4N / 15mm; the peel strength between the two layers of materials laminated by weak adhesive is above 0.05N / 15mm and below 2.26N / 15mm. 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 composite pressing roller of the dry laminating machine is 50~60℃. The temperature of the aging chamber is 50~55℃.

[0062] Embodiment 2: Cooperate Figure 2 As shown, in the second embodiment of the present invention, the two-piece sealing gasket of the present invention also includes a backing layer 1, a weak adhesive layer 2, an adhesive sealing composite layer 3 and a release layer 9. The backing layer 1, the weak adhesive layer 2 and the release layer 9 of the second embodiment are the same as those of the first embodiment.

[0063] In the second embodiment of the present invention, the sealing composite layer 3 includes an electromagnetic induction heating layer 31 and a sealing layer 32 which are compounded in sequence from top to bottom, the sealing layer 32 includes a sealing film 322 and an adhesive 321, the thickness of the sealing film 322 is 12~100µm, the adhesive 321 is located between the electromagnetic induction heating layer 31 and the sealing film 322, the sealing film 322 includes at least one of paper, a PE layer, a PP layer, a PA layer, a PVDC layer, an EVOH layer and a PET layer, and the thickness of the sealing film 322 is 12~100µm.

[0064] Embodiment three: Cooperate Figure 3 to Figure 4 As shown, in the third embodiment of the present invention, the two-piece sealing gasket of the present invention comprises a backing layer 1, a weak adhesive layer 2, a release layer 9, a surface film 4, a release area 6, a super strong adhesive 5, a connecting film 7, a first adhesive layer 8 and a sealing composite layer 3 (which may be the above-mentioned electromagnetic induction heating layer 31 and sealing layer 32) which are compounded in sequence from top to bottom. The backing layer 1, the weak adhesive layer 2, the release layer 9 and the sealing composite layer 3 of the third embodiment may be the same as those of the first or second embodiment.

[0065] In the third embodiment of the present invention, the upper surface or the lower surface of the surface film 4 can be a printing surface to print different patterns. The surface film includes at least one of a PP layer, a PET layer, a PE layer, a PA layer, a PEN layer and a PI layer, and the thickness of the surface film is 12-150 μm. Within this thickness range, the surface film 4 has a greater tensile strength, a smooth surface and better glossiness.

[0066] In the third embodiment of the present invention, the super adhesive 5 is used to compound the surface film 4 with a part of the connecting film 7, so that the peel strength between the two is greater than 17.8N / 15mm, so as to provide a strong bonding force; thereby, when the user uncovers the two-piece sealing gasket, the layer below the connecting film 7 (such as the adhesive composite layer 3) can be opened at the same time. The super adhesive 5 can be a dry composite adhesive, and the thickness of the super adhesive 5 is 1~7µm. Alternatively, the super adhesive 5 can be a hot melt laminating adhesive, the material of the hot melt laminating adhesive is one of PE, PP, EMAC, EMAA, EEA, EAA and EMMA, and the thickness of the hot melt laminating adhesive is 4~50µm.

[0067] In the third embodiment of the present invention, the release zone 6 is located below the surface film 4, and the release zone 6 is connected to the surface film 4 and part of the super strong adhesive 5, and the release zone 6 is not directly connected to the connecting film 7. In contrast, the release zone 6 can also be above the connecting film 7 (not shown), and the release zone 6 can be connected to the connecting film 7 and part of the super strong adhesive 5, but the release zone 6 is not directly connected to the surface film 4. The release zone 6 includes varnish or silicone oil, and the thickness of the release zone 6 is 0.5~20μm. When the user pinches and pulls the release zone 6 upward, because the surface film 4 and the connecting film 7 are still in a composite state by the super strong adhesive 5, the two-piece sealing gasket can be opened in a flap-type pinching and pulling manner.

[0068] In the third embodiment of the present invention, Figure 4 As shown, when the two-piece sealing gasket is approximately circular in a top view, the coating lateral width W of the release zone 6 is between 1 / 6 and 5 / 6 times the diameter D of the two-piece sealing gasket, that is, 1 / 6D≦W≦5 / 6D; thereby, the coating lateral width W of the release zone 6 is not limited to W=1 / 2D, and in response to the sizes of different sealing gasket diameters, the two-piece sealing gasket can be conveniently designed while improving the convenience of users tearing off the sealing gasket.

[0069] In the third embodiment of the present invention, the connecting film 7 is mainly used to be compounded with the electromagnetic induction heating layer 31, and a part of the connecting film 7 can be compounded with the surface film 4 through the super strong adhesive 5. The connecting film 7 includes at least one of a PET layer, a PE layer, a PA layer, an EPP layer and an EPE layer, and the thickness of the connecting film is 12~200µm; the peeling strength after compounding with the electromagnetic induction heating layer 31 can be improved by the connecting film 7. The connecting film 7 is compounded with the electromagnetic induction heating layer 31 through the first adhesive layer 8, and the first adhesive layer 8 can be a conventional adhesive, such as a dry composite adhesive, etc., without special restrictions.

[0070] The manufacturing method of the two-piece sealing gasket of the third embodiment of the present invention may be: First, an adhesive is applied to the upper surface of the electromagnetic induction heating layer coil and dry-laminated with the composite surface of the bonding film coil, and then placed in a maturing chamber for more than 24 hours to produce the first composite layer coil; Next, an adhesive is applied to the lower surface of the first composite layer coil and dry-laminated with the composite surface of the sealing film coil, and then placed in a maturing chamber for more than 24 hours to produce a lower composite layer coil; alternatively, a hot melt adhesive is directly applied to the lower surface of the first composite layer coil to produce a lower composite layer coil.

[0071] Furthermore, a release layer is applied on the upper surface of the surface film roll, and a release zone is applied on the lower surface of the surface film roll (the coating width is between 1 / 6 and 5 / 6 times the diameter of the two-piece sealing gasket), and a super-strong adhesive is applied on the upper surface of the connecting film of the lower composite part roll, followed by dry compounding and entering a maturing chamber for more than 24 hours to produce a bottom layer roll; in addition, when the diameter D of the two-piece sealing gasket is relatively large, the cross-sectional width W of the coating range of the super-strong adhesive 5 can be increased; and when the diameter D of the two-piece sealing gasket is relatively small, the cross-sectional width W of the coating range of the super-strong adhesive 5 can be reduced; Then, a weak adhesive is applied between the lower surface of the paperboard roll and the upper surface of the surface film of the bottom roll, and dry lamination or coating lamination is performed to make a two-piece sealing gasket roll; Finally, the sealing gasket is cut into two pieces according to the customer's size requirements.

[0072] Among them, the peel strength between the two layers of materials compounded by adhesive dry type is greater than 4N / 15mm; the peel strength between the two layers of materials compounded by weak adhesive is greater than 0.05N / 15mm and less than 2.26N / 15mm; the peel strength between the two layers of materials compounded by super strong adhesive dry type is greater than 17.8N / 15mm. The temperatures of the five sections of the upper drying tunnel of the dry type compounding machine are 60~65℃, 65~70℃, 70~75℃, 75~80℃, and 80~85℃ respectively. The temperature of the compounding roller of the dry type compounding machine is 50~60℃. The temperature of the aging chamber is 50~55℃.

[0073] Embodiment 4: Cooperate Figure 5 As shown, in the fourth embodiment of the present invention, the two-piece sealing gasket of the present invention comprises a backing layer 1, a weak adhesive layer 2, a release layer 9, a surface film 4, a connecting film 7, a release block 6A, a strong adhesive 5A, and a sealing composite layer 3 (which may be the above-mentioned electromagnetic induction heating layer 31 and sealing layer 32) which are compounded in sequence from top to bottom. The backing layer 1, the weak adhesive layer 2, the release layer 9 and the sealing composite layer 3 of the fourth embodiment may be the same as those of the first or second embodiment.

[0074] In the fourth embodiment of the present invention, the upper surface or the lower surface of the surface film 4 can be a printing surface to print different patterns. The surface film 4 includes at least one of a PP layer, a PET layer, a PE layer, a PA layer, a PEN layer and a PI layer, and the thickness of the surface film is 12-150 μm. Within this thickness range, the surface film 4 has a greater tensile strength, a smooth surface and better glossiness.

[0075] In the fourth embodiment of the present invention, the strong adhesive 5A is used to compound the connecting film 7 with a part of the electromagnetic induction heating layer 31 (both sides of the connecting film 7), so that the peel strength between the two is greater than 17.8N / 15mm, so as to provide a strong bonding force; thereby, when the user uncovers the two-piece sealing gasket, the layer below the connecting film 7 (such as the adhesive composite layer 3) can be uncovered at the same time. The strong adhesive 5A can be a dry composite adhesive, and the thickness of the strong adhesive 5A is 1~7µm. Alternatively, the strong adhesive 5A can be a hot melt laminating adhesive, the material of the hot melt laminating adhesive is one of PE, PP, EMAC, EMAA, EEA, EAA and EMMA, and the thickness of the hot melt laminating adhesive is 4~50µm. The connecting film 7 may include at least one of a PET layer, a PE layer, a PP layer, a PA layer, an EPP layer and an EPE layer, and the thickness of the connecting film is 12~200µm; the connecting film 7 can improve the peeling strength after being compounded with the electromagnetic induction heating layer 31.

[0076] In the fourth embodiment of the present invention, Figure 6As shown, the upper surface of the two-piece sealing gasket of the present invention may include a lifting portion 610, a lifting neck 620, a hollow area 630 and a peripheral area 640. The lifting portion 610, the lifting neck 620 and the hollow area 630 are all located in the same half (upper half) of the two-piece sealing gasket, so that the manufacturer can use the area of ​​the other half to make other design considerations, so as to meet the design requirements of the manufacturer, thereby improving the manufacturer's design flexibility and / or the aesthetics of the sealing gasket; the hollow area 630 is cut by the hollow cutting line 720, and the hollow area 630 is located at the periphery of the lifting portion 610 and the hollow area 630 is connected to both sides of the lifting neck 620; the thickness of the two-piece sealing gasket portion corresponding to the hollow area 630 is less than the overall thickness of the two-piece sealing gasket; the upper surface of the two-piece sealing gasket is also provided with a tear line 710. Specifically, the lifting portion 610 is equivalent to the area surrounded by points abcda, the lifting neck 620 is equivalent to the area between points he, the hollow area 630 is equivalent to the area surrounded by points abcdefga, and the peripheral area 640 is equivalent to the area surrounding the lifting portion 610, the lifting neck 620 and the hollow area 630. The tear line 710 is equivalent to the line connected by points aghi, and the hollow cutting line 720 is equivalent to the line connected by points abcdefga. Furthermore, the tear line 710 is provided with at least one tear cutting point, the surface film 4 corresponding to the tear cutting point is not completely cut in the vertical direction, and the surface film 4 corresponding to the tear line except for each tear cutting point is completely cut; while the hollow cutting line 720 is not provided with a hollow cutting point.

[0077] In the fourth embodiment of the present invention, one end of the tear line 710 (i.e., point a) is connected to the lifting portion 610, and the other end of the tear line 710 (i.e., point i) is separated from the outermost circle OC of the two-piece sealing gasket by a tear spacing 715, and the tear spacing 715 is greater than 0 mm and the tear spacing 715 is less than or equal to 20 mm. The tear spacing refers to the shortest distance from one end of the tear line 710 (i.e., relative to the other end connected to the lifting portion 610) to the outermost circle OC of the two-piece sealing gasket. Preferably, the tear spacing 715 is greater than 0 mm and the tear spacing 715 is less than or equal to 10 mm. By configuring the tear spacing 715, when the user pinches the lifting portion 610 and lifts the lifting portion 610 along the tear line 710, and as the end of the tear line 710 (i.e., point i) is torn, the two-piece sealing gasket will provide a buffering effect due to the termination of the tear line 710, thereby preventing the user from only partially peeling off the two-piece sealing gasket (such as the lifting portion 610 and the area above it) due to strong peeling force, thereby reminding the user to appropriately change the peeling force and force direction to improve the integrity of the peeling of the sealing gasket.

[0078] In the fourth embodiment of the present invention, the upper surface of the two-piece sealing gasket is further provided with a tear-twist cutting line 730, which is equivalent to the line connected by the points djk. In addition, the tear-opening line 710 is connected to one end of the lifting portion 610 (i.e., point a), and the tear-twist cutting line 730 is connected to the other end of the lifting portion 610 (i.e., point d), so that the tear-opening line 710 and the tear-twist cutting line 730 are respectively arranged on the left and right sides of the hollow area 630. Through the configuration of the tear-twist cutting line 730, when the user pinches the lifting portion 610 and lifts the lifting portion 610 along the tear line 710, and after the end of the tear line 710 (i.e., point i) is torn up, not only can a buffering effect be provided due to the termination of the tear line 710, but the user can also be guided to further uncover the two-piece sealing gasket along the tear-twist cutting line 730, thereby reminding the user to appropriately change the uncovering force and force direction to improve the integrity of the uncovering of the sealing gasket.

[0079] In the fourth embodiment of the present invention, the release block 6A is located on the lower surface of the connecting film 7 (that is, the release block 6A is located between the connecting film 7 and the strong adhesive 5A), and the release block 6A includes one of wax, varnish and silicone oil, and the thickness of the release block 6 is 0.5~40µm. The surface of the release block 6A can be a glossy surface, a matte surface or a lattice surface, so that the release block 6A has the characteristic of being easy to peel off. Through the configuration of the release block 6A, the present invention can prevent the lifting portion 610 from being easily adhered to the electromagnetic induction heating layer 31 below, so that the user can more easily lift the lifting portion 610, and then the layers in the two-piece sealing gasket can be more easily pulled up along with the lifting portion, thereby improving the convenience of the user to uncover it. When the user pinches and pulls upward the corresponding lifting portion of the release block 6A, the two-piece sealing gasket can be peeled off by pinching and pulling because the connecting film 7 and the electromagnetic induction heating layer 31 are still kept in a composite state by the strong adhesive 5A.

[0080] In addition, the release block 6A is coated on the lower surface of the connecting film 7, and the coating area of ​​the release block 6A is not smaller than the area corresponding to the lifting portion 610. Figure 6 As shown, the coating area of ​​the release block is not less than the first coating range 810 (equivalent to Figure 6 If the release block 6A is coated on the upper surface or the lower surface of the electromagnetic induction heating layer 31, the coating area of ​​the release block 6A is not less than the lifting portion 610 and the hollow area 630, that is, the coating area of ​​the release block 6A is not greater than the second coating range 820 (equivalent to Figure 6 The area enclosed by the dotted line in the figure).

[0081] Embodiment five: Cooperate Figure 7As shown, the difference between the fifth embodiment of the present invention and the fourth embodiment is that the release block 6A is set at a different position; specifically, in the fifth embodiment of the present invention, the release block 6A is located on the upper surface of the electromagnetic induction heating layer 31 (that is, the release block 6A is located between the strong adhesive 5A and the electromagnetic induction heating layer 31); through the configuration of the release block 6A, the above-mentioned lifting portion can also be less likely to be adhered to the electromagnetic induction heating layer 31 below, so that the user can more easily lift the lifting portion, and then the layers in the two-piece sealing gasket can be more easily pulled up with the lifting portion, thereby improving the convenience of the user to uncover. When the user pinches and pulls the release block 6A upward corresponding to the lifting portion, because the connecting film 7 and the electromagnetic induction heating layer 31 are still in a composite state by the strong adhesive 5A, the two-piece sealing gasket can be uncovered by pinching and pulling in a flap-type manner.

[0082] Embodiment six: Cooperate Figure 8 As shown, in the sixth embodiment of the present invention, the two-piece sealing gasket of the present invention comprises a backing layer 1, a weak adhesive layer 2, a release layer 9, a surface film 4, a super adhesive 5, a connecting film 7, a first adhesive layer 8 and a sealing composite layer 3 which are compounded in sequence from top to bottom. Compared with the third embodiment, the fifth embodiment omits the release zone, and makes the coating width of the super adhesive 5 between 1 / 6 and 5 / 6 times of the diameter of the two-piece sealing gasket; thereby, there is no need to coat the release zone, and the two-piece sealing gasket can be conveniently designed while the sealing gasket is torn off in a pull-type manner.

[0083] Embodiment seven: Cooperate Fig. 9 As shown, the difference between the seventh embodiment of the present invention and the first to sixth embodiments is the sealing composite layer 3 .

[0084] In embodiment six of the present invention, the sealing composite layer 3 includes an electromagnetic induction heating layer 31, a second adhesive layer 35, a bonding layer 36, an adhesive 321 and a sealing film 322 which are sequentially composited from top to bottom; wherein the electromagnetic induction heating layer 31, the adhesive 321 and the sealing film 322 are the same as those in the above embodiment and will not be described in detail herein.

[0085] In the sixth embodiment of the present invention, the bonding layer 36 is located between the electromagnetic induction heating layer 31 and the adhesive layer 32, and the bonding layer includes at least one of a PET layer, a PE layer, a PP layer, a PEN layer and a PA layer, and the thickness of the bonding layer is 12 to 150 μm. By means of the bonding layer 36, the tensile strength of the adhesive composite layer 3 can be further improved.

[0086] In the sixth embodiment of the present invention, the bonding layer 36 is compounded with the electromagnetic induction heating layer 31 through the second adhesive layer 35 . The second adhesive layer 35 can be a conventional adhesive, such as a dry composite adhesive, etc., without particular limitation.

[0087] Hereinafter, a wireless information integrated sheet which can be used as the electromagnetic induction heating layer of the present invention will be described.

[0088] The first implementation method of the wireless information integrated chip: Cooperate Figures 10 to 12 As shown, in the first embodiment of the wireless information integrated sheet, the wireless information integrated sheet includes 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 so as to bond the base film 1w and the information and heating layer 3w.

[0089] In the first embodiment of the wireless information integrated sheet, the base film 1w is used to make the initial layer of the wireless information integrated sheet. In a specific example, the base film 1w may include at least one of a PI film, a PEN film, a PET film, a PC film, a PP film and a PE film, and the thickness of the base film 1w is preferably 20 to 150 μm. Within this range, the longitudinal tensile strength of the base film 1w is relatively large. The lower surface of the base film 1w is bonded to the first adhesive layer 2w, and the upper surface of the base film 1w can be used as a printing surface to print different patterns.

[0090] In the first embodiment of the wireless information integrated sheet, the first adhesive layer 2w is a layer used to bond the base film 1w and the information and heating layer 3w. The first adhesive layer 2w only needs to be able to bond the base film 1w and the information and heating layer 3w, and its material can be, for example, composite glue. The thickness of the first adhesive layer 2w can be 0.5 to 7µm, and the first adhesive layer 2w can make the peel strength between the two bonded layers of material greater than 4N / 15mm.

[0091] In the first embodiment of the wireless information integrated sheet, 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 mutually conductive. The electromagnetic induction heating ring 32w can pass through the electromagnetic field generated by the electromagnetic induction sealing machine, and use electromagnetic induction to heat it, so that the adhesive layer 320 of the present invention is heated and melted and adhered to the container mouth of the packaging container, and then can be used as an electromagnetic induction sealing gasket to seal the container mouth. The wireless information integrated sheet of the present invention can only generate heat in the electromagnetic induction heating ring 32w, which can not only block the heat from being transferred to the central area of ​​the sealing gasket during electromagnetic induction sealing, but also save energy waste. In addition, when applied to a sealing gasket containing a battery, the thickness of the information and heating layer 3w can be 6µm to 2.5mm; and when applied to a sealing gasket without a battery, the thickness of the information and heating layer 3w can be 6 to 300µm.

[0092] In the first embodiment of the wireless information integrated chip, Fig.11 As shown, the electromagnetic induction heating ring 32w surrounds the information area 31w in a planar perspective, and the electromagnetic induction heating ring 32w and the information area 31w are filled with a space ITV, that is, there is no physical connection component (such as the physical connection bridge 33w described later) between the electromagnetic induction heating ring 32w and the information area 31w. Thereby, the electromagnetic induction heating ring 32w and the information area 31w are filled with a space ITV, and the space ITV can block the heat from being conducted to the information area 31w. The space ITV (the distance between the outermost edge of the information area 31w and the innermost edge of the electromagnetic induction heating ring 32w) can be 0.1 to 3mm. The material of the electromagnetic induction heating ring 32w can be metal, such as aluminum, copper, gold, silver, or tin, but is not limited thereto. From the perspective of the effect of generating heat when subjected to a changing electromagnetic field and the cost, the electromagnetic induction heating ring 32w is preferably aluminum foil, and its thickness is preferably 6 to 40µm.

[0093] In the first embodiment of the wireless information integrated chip, Fig.12 As shown, the information area 31w includes a chip 311w and an antenna 312w, and the chip 311w and the antenna 312w can realize the wireless information transmission function based on the RFID frequency band that the user wants to use. As for the chip 311w, it can have a unique identification code, which can be selected according to the purpose. For example, the chip 311w 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 special restrictions. These chips can all match the antenna 312w described later to realize the wireless information communication function. As for the antenna 312w, it mainly produces the function of wirelessly transmitting signals, and its material can be metal, such as copper, silver, gold, tin or aluminum, etc., without special restrictions.

[0094] In the first embodiment of the wireless information integrated sheet coil, the method for making the wireless information integrated sheet coil can be as follows: first, apply a composite glue (first adhesive layer 2w) on the composite surface of the base film coil, and after compounding it with the composite surface of the metal foil coil, make a wireless information integrated sheet blank coil; secondly, etch the metal foil of the wireless information integrated sheet blank coil, electrically connect the antenna 312w and the chip 311w (Bonding), and then use a chip packaging protective glue to encapsulate the chip 311w and the chip connection part through a dispensing machine. At this time, the metal foil forms the information and heating layer 3w, and the wireless information integrated sheet blank coil becomes a wireless information integrated sheet coil (that is, the above-mentioned electromagnetic induction heating sheet coil). The wireless information integrated sheet coil is cut accordingly to obtain a wireless information integrated sheet. In addition, if you want to add a battery to the information and heating layer 3w, you can use a welding machine or conductive glue to process the battery cell and the chip 311w into an electrical connection.

[0095] The second implementation method of the wireless information integrated chip: Cooperate Fig.13 As shown, the difference between the second embodiment of the wireless information integrated sheet and the first embodiment of the wireless information integrated sheet is that in the second embodiment of the wireless information integrated sheet, in addition to the above-mentioned base film 1w, the first adhesive layer 2w and the information and heating layer 3w, the wireless information integrated sheet also includes a protective layer 5w and a second adhesive layer 4w. Among them, 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 is used to bond the information and heating layer 3w and the protective layer 5w.

[0096] In the second embodiment of the wireless information integrated sheet, the second adhesive layer 4w can be used as long as it can bond the information to the heating layer 3w and the protective layer 5w. Its material can be, for example, dry composite adhesive, and there is no particular limitation. The thickness of the second adhesive layer 4w can be 0.5 to 7µm, and it is preferred that the peel strength between the two bonded layers of material is greater than 4N / 15mm. The second adhesive layer 4w can extend to fill the gap between the electromagnetic induction heating ring 32w and the information area 31w to enhance the overall structural strength of the wireless information integrated sheet.

[0097] In the second embodiment of the wireless information integrated chip, the protective layer 5w is used to protect the information area 31w (i.e., the chip 311w, the antenna 312w, and the battery that can be added) from being damaged by external forces and affecting its wireless information transmission capability. The protective layer 5w may include at least one of PET film, PP film, PE film, PA film, PVDC film, EVOH film, PEN film, and PI film. The thickness of the protective layer 5w may be 12 to 100µm. In addition, the upper surface or the lower surface of the protective layer 5w may be used as a printing surface.

[0098] The third implementation method of the wireless information integrated chip: Cooperate Fig.14 and Fig.15 As shown, in the third embodiment of the wireless information integrated sheet, the main difference between the third embodiment of the wireless information integrated sheet of the present invention and the first to second embodiments of the wireless information integrated sheet of the present invention is that in the third embodiment of the wireless information integrated sheet of the present invention, the electromagnetic induction heating ring 32w and the antenna 312w are separated from each other, and the interval between the electromagnetic induction heating ring 32w and the antenna 312w is 0.1mm~3mm, and the information and heating layer 3w also includes at least one physical connection bridge 33w connecting the antenna 312w and the electromagnetic induction heating ring 32w, and the physical connection bridge 33w can improve the stability of the information and heating layer 3w, and the antenna 312w, the electromagnetic induction heating ring 32w and the physical connection bridge 33w of the information and heating layer 3w can be integrally arranged, and the material of the physical connection bridge 33w is aluminum, copper, gold, silver or tin, and the length of the physical connection bridge 33w is 0.1mm~3mm, and the width of the physical connection bridge is 0.01mm~5mm. Among them, since the size of the physical connection bridge 33w is very small, it can largely block the heat of the electromagnetic induction heating ring 32w from being transferred to the antenna 312w, and only slightly reduce the distance of wireless communication.

[0099] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A two-piece sealing gasket, characterized in that: It includes a backing layer, a weak adhesive layer and an adhesive-sealing composite layer arranged in sequence from top to bottom; The backing layer is paperboard or foam board film; The sealing composite layer includes an electromagnetic induction heating layer and a sealing layer arranged in sequence from top to bottom; The weak adhesive layer is located between the backing layer and the adhesive sealing composite layer, and the weak adhesive layer makes the peeling strength between the backing layer and the adhesive sealing composite layer be greater than 0.05N / 15mm and less than 2.26N / 15mm.

2. The two-piece sealing gasket according to claim 1, characterized in that: It also includes a release layer, which is located below the weak adhesive layer, and the release layer is made of varnish or silicone oil that is fully coated or dot-coated.

3. The two-piece sealing gasket according to claim 2, characterized in that: It also includes a surface film, a super strong adhesive and a bonding film which are sequentially arranged between the release layer and the electromagnetic induction heating layer; The super strong adhesive is a dry composite adhesive or hot melt laminating adhesive. The super strong adhesive makes the peel strength between the surface film and the connecting film greater than 17.8N / 15mm; The surface film includes at least one of a PP layer, a PET layer, a PE layer, a PA layer, a PEN layer and a PI layer; The connecting film includes at least one of a PET layer, a PE layer, a PP layer, a PA layer, an EPP layer, and an EPE layer.

4. The two-piece sealing gasket according to claim 2, characterized in that: It also includes a surface film, a bonding film and a strong adhesive which are sequentially arranged between the release layer and the electromagnetic induction heating layer; The strong adhesive is a dry composite adhesive or a hot melt laminating adhesive, and the strong adhesive makes the peel strength between the bonding film and the electromagnetic induction heating layer greater than 12N / 15mm; The surface film includes at least one of a PP layer, a PET layer, a PE layer, a PA layer, a PEN layer and a PI layer; The bonding film includes at least one of a PET layer, a PE layer, a PP layer, a PA layer, an EPP layer and an EPE layer; The lower surface of the connecting film is matched with a release block, or the upper surface or the lower surface of the electromagnetic induction heating layer is matched with a release block; the material of the release block is one of wax, varnish and silicone oil.

5. The two-piece sealing gasket according to claim 1, characterized in that: It also includes a barrier layer, which is located above the weak adhesive layer. The material of the barrier layer includes at least one of a PET layer, a PA layer, a PVDC layer and an EVOH layer.

6. The two-piece sealing gasket according to any one of claims 1 to 5, characterized in that: The material of the weak adhesive layer is polyolefin; or, the material of the weak adhesive layer is polyurethane; or, the material of the weak adhesive layer is wax, and the coating method of the weak adhesive layer is dot coating or full coating.

7. The two-piece sealing gasket according to any one of claims 1 to 5, characterized in that: The sealing layer is a hot melt adhesive; or, the sealing layer includes a composite sealing film and an adhesive, and the adhesive is located between the electromagnetic induction heating layer and the sealing film; The material of the hot melt adhesive is one of PE, PP, EVA, PIB, EEA, EAA, EMAA, EMMA, polyacrylate, acrylic copolymer, EBA and EMAC; The sealing film comprises at least one of paper, a PE layer, a PP layer, a PA layer, a PVDC layer, an EVOH layer and a PET layer.

8. The two-piece sealing gasket according to claim 1, characterized in that: It also includes a surface film, a super strong adhesive and a bonding film which are sequentially arranged between the weak adhesive layer and the electromagnetic induction heating layer. The super strong adhesive is a dry composite adhesive or hot melt laminating adhesive. The super strong adhesive makes the peel strength between the surface film and the connecting film greater than 17.8N / 15mm; The surface film includes at least one of a PP layer, a PET layer, a PE layer, a PA layer, a PEN layer and a PI layer; The connecting film includes at least one of a PET layer, a PE layer, a PP layer, a PA layer, an EPP layer, and an EPE layer.

9. The two-piece sealing gasket according to claim 3 or 8, characterized in that: It also includes a release zone, which is located below the surface film. The release zone includes varnish or silicone oil, and the coating width of the release zone is between 1 / 6 and 5 / 6 times the diameter of the two-piece sealing gasket.

10. The two-piece sealing gasket according to claim 3 or 8, characterized in that: The coating width of the super strong adhesive is between 1 / 6 and 5 / 6 of the diameter of the two-piece sealing gasket.

11. The two-piece sealing gasket according to claim 1, characterized in that: It also includes a surface film, a connecting film and a strong adhesive arranged in sequence between the weak adhesive layer and the electromagnetic induction heating layer, wherein the strong adhesive is a dry composite adhesive or a hot-melt laminating adhesive, and the strong adhesive makes the peeling strength between the connecting film and the electromagnetic induction heating layer greater than 12N / 15mm; The surface film includes at least one of a PP layer, a PET layer, a PE layer, a PA layer, a PEN layer and a PI layer; The bonding film includes at least one of a PET layer, a PE layer, a PP layer, a PA layer, an EPP layer and an EPE layer; The lower surface of the connecting film is matched with a release block, or the upper surface or the lower surface of the electromagnetic induction heating layer is matched with a release block; the material of the release block is one of wax, varnish and silicone oil.

12. The two-piece sealing gasket according to claim 3, 4, 8 or 11, characterized in that: The material of the hot melt laminating adhesive is one of PE, PP, EMAC, EMAA, EEA, EAA and EMMA.

13. The two-piece sealing gasket according to claim 4 or 11, characterized in that: The upper surface of the two-piece sealing gasket includes a lifting portion, a lifting neck and a hollow area; The hollow area is cut by the hollow cutting line, the hollow area is located at the periphery of the lifting part and is connected to both sides of the lifting neck; the thickness of the two-piece sealing gasket portion 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 also 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 spaced from the outermost circle of the two-piece sealing gasket by a tear distance, the tear distance is greater than or equal to 0 mm, and the tear distance is less than or equal to 20 mm; The tear line is provided with at least one tearing and cutting point, the surface film corresponding to the tearing and cutting point is not completely cut in the vertical direction, and the surface film corresponding to the tear line except for the tearing and cutting points is completely cut; and a release block is also included between the connecting film and the electromagnetic induction heating layer; the release block is located on the lower surface of the connecting film portion corresponding to the lifting portion, and the coating area of ​​the release block is not smaller than the lifting portion; or, the release block is located on the upper surface or lower surface of the electromagnetic induction heating layer portion corresponding to the lifting portion, the lifting neck and the hollow area, and the coating area of ​​the release block is not smaller than the lifting portion and the hollow area.

14. The two-piece sealing gasket according to claim 13, characterized in that: The lifting portion, lifting neck and 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 portion, and the tear line and the tear-twist cutting line are respectively connected to the two ends of the lifting portion.

15. The two-piece sealing gasket according to claim 1 or 2 or 3 or 4 or 8 or 11, characterized in that: A polyolefin coating layer is disposed on the side of the backing layer facing the weak adhesive layer, and the polyolefin coating layer includes at least one of a polyethylene layer, a polypropylene layer, a polypentene layer and a polyhexene layer.

16. The two-piece sealing gasket according to claim 1, characterized in that: The electromagnetic induction heating layer is aluminum foil or a wireless information integrated sheet.

17. The two-piece sealing gasket according to claim 16, characterized in that: The wireless information integrated sheet comprises a base film, an information and heating layer and a first adhesive layer; The information and heating layer comprises an information area and an electromagnetic induction heating ring, wherein the information area has an antenna and a chip which are connected to each other, and the electromagnetic induction heating ring surrounds the information area; The first adhesive layer is located between the base film and the information and heating layer.

18. The two-piece sealing gasket according to claim 17, characterized in that: The wireless information integrated sheet also includes a protective layer and a second adhesive layer: The protective layer is 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 and heating layer and the protective layer.

19. The two-piece sealing gasket according to claim 17, characterized in that: There is a gap between the electromagnetic induction heating ring and the information area.

20. The two-piece sealing gasket according to claim 19, characterized in that: The interval between the electromagnetic induction heating ring and the information area is 0.1mm to 3mm.

21. The two-piece sealing gasket according to claim 19, characterized in that: There is a full space between the electromagnetic induction heating ring and the information area.

22. The two-piece sealing gasket according to claim 19, characterized in that: The information and heating layer also includes at least one physical connection bridge, which connects the information area and the electromagnetic induction heating ring.

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