CN117262312A - Electromagnetic sealing method for hiding aluminum foil layer and pull lugs - Google Patents
Electromagnetic sealing method for hiding aluminum foil layer and pull lugs Download PDFInfo
- Publication number
- CN117262312A CN117262312A CN202311267416.5A CN202311267416A CN117262312A CN 117262312 A CN117262312 A CN 117262312A CN 202311267416 A CN202311267416 A CN 202311267416A CN 117262312 A CN117262312 A CN 117262312A
- Authority
- CN
- China
- Prior art keywords
- layer
- sealing
- aluminum foil
- foil layer
- heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 134
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 63
- 239000011888 foil Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000010410 layer Substances 0.000 claims abstract description 236
- 238000005187 foaming Methods 0.000 claims abstract description 29
- 239000012790 adhesive layer Substances 0.000 claims abstract description 23
- 238000013329 compounding Methods 0.000 claims abstract description 9
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 11
- 229920006267 polyester film Polymers 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- 239000006260 foam Substances 0.000 description 13
- 238000005520 cutting process Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000005030 aluminium foil Substances 0.000 description 4
- 238000009413 insulation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B7/00—Closing containers or receptacles after filling
- B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
- B65B7/28—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers
- B65B7/2842—Securing closures on containers
- B65B7/2878—Securing closures on containers by heat-sealing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/022—Mechanical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D53/00—Sealing or packing elements; Sealings formed by liquid or plastics material
- B65D53/04—Discs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/05—5 or more layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2581/00—Seals; Sealing equipment; Gaskets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
Abstract
The invention discloses an electromagnetic sealing method for hiding an aluminum foil layer and a pull lug, which comprises the following steps: compounding an aluminum foil layer on the lower surface of the double-sided laminated foaming layer; a heat conducting layer is compounded on the lower surface of the aluminum foil layer, and a sealing layer is formed by the double-sided laminated foaming layer, the aluminum foil layer and the heat conducting layer together; the pull lug part is turned upwards and is attached to the upper surface of the sealing part, and the sealing part and the pull lug part form a sealing layer together; bonding the sealing layer with the upper surface of the sealing layer through a thermal stripping adhesive layer to form a sealing gasket; placing the sealing gasket in the bottle cap, and screwing the bottle cap at the opening of the bottle; the electromagnetic induction is adopted to heat the aluminum foil layer, and the aluminum foil layer enables the sealing layer to be thermally sealed on the bottle mouth in a heat transfer mode. The sealing gasket manufactured by the electromagnetic sealing method can hide the aluminum foil layer and the pull lugs, has stronger integrity when sealing, is not easy to damage due to stress, can expose the pull lugs when being required to be torn, and is convenient to tear and not to adhere.
Description
Technical Field
The invention relates to a manufacturing process of a sealing gasket, in particular to an electromagnetic sealing method for hiding an aluminum foil layer and a pull lug.
Background
After filling, plastic containers such as medicine bottles, oil bottles, milk powder cans and the like are generally sealed at bottle openings/filling openings by adopting sealing layers, and after tearing the sealing layers, if objects in the plastic containers are not used up once, the sealing effect is deteriorated after the plastic containers are covered again.
In order to solve the above sealing problem, the current sealing gasket generally has a resealing function, such as a sealing gasket disclosed in publication number CN210175540U and publication date 2020, and comprises an adhesive layer, an aluminum layer and a backing layer which are sequentially stacked, wherein the backing layer is provided with a handle portion, an annular cutting line and a linear cutting line, the backing layer is divided into an outer ring and an inner ring by the annular cutting line, the handle portion is located in an area surrounded by the annular cutting line, the root portion of the handle portion is connected with the inner ring, the annular cutting line has a start end and a terminal end which are staggered from each other, one end of the strip cutting line is connected with the side edge of the handle portion, and the other end of the strip cutting line is connected with the terminal end. The sealing gasket can form a handle to be conveniently torn, and the outer ring can be left on the container mouth after being torn to realize resealing. However, due to the adoption of a multi-layer structure, the adhesive layer, the aluminum layer and the back lining layer are required to be torn together during tearing, so that the tearing is difficult, the root of the handle is easy to break due to stress, and the edge of the aluminum layer is easy to be adhered when the handle is torn; meanwhile, as the space around the handle needs to be hollowed out for reserving the holding space, the handle and the partial area of the aluminum layer can be directly exposed, so that the aluminum layer is easy to damage due to the stress of the handle, and the attractive appearance is not enough.
Disclosure of Invention
The invention aims to solve the technical problem of providing an electromagnetic sealing method for hiding an aluminum foil layer and a pull lug, wherein the sealing gasket manufactured by the electromagnetic sealing method can hide the aluminum foil layer and the pull lug, has stronger integrity when sealing, is not easy to damage due to stress, can expose the pull lug when being required to be torn, and is convenient to tear and not adhered.
In order to solve the technical problems, the technical scheme adopted is as follows:
an electromagnetic sealing method for hiding an aluminum foil layer and a pull lug is characterized by comprising the following steps:
step (1), respectively compounding a first film layer and a second film layer on the upper surface and the lower surface of the foaming layer to form a double-sided laminated foaming layer;
step (2), compounding an aluminum foil layer on the lower surface of the double-sided laminated foaming layer;
step (3), compounding a heat conduction layer on the lower surface of the aluminum foil layer, wherein the double-sided laminated foaming layer, the aluminum foil layer and the heat conduction layer together form a sealing layer;
dividing the sealing film layer into a sealing part and a pulling lug part, and upwards turning the pulling lug part and attaching the pulling lug part to the upper surface of the sealing part, wherein the sealing part and the pulling lug part jointly form a sealing layer;
step (5), coating a heat stripping adhesive layer on the upper surface of the sealing layer;
step (6), the lower surface of the sealing layer is attached to the upper surface of the sealing layer through a thermal stripping adhesive layer to form a sealing sheet;
step (7), punching and shearing the sealing sheet material into sealing gaskets according to the specification of the bottle mouth;
step (8), placing the sealing gasket in the bottle cap, and screwing the bottle cap at the opening of the bottle;
and (9) heating the aluminum foil layer by adopting electromagnetic induction, and transferring heat to the thermal stripping adhesive layer and the sealing layer by the aluminum foil layer in a heat transfer mode, so that the sealing layer is thermally sealed on the bottle mouth.
In the electromagnetic sealing method, a sealing layer and a sealing layer are bonded together by adopting a heat stripping adhesive layer to form a sealing gasket; when the sealing gasket is placed in the bottle cap and covered on the bottle mouth for screwing, and then the sealing layer is thermally sealed on the bottle mouth by adopting electromagnetic induction, the heat conduction layer transmits heat to the thermal stripping adhesive layer, the thermal stripping adhesive layer loses viscosity when being cooled after being heated, so that the sealing layer is adhered to the bottle mouth of the plastic container, and the sealing layer are still in a close-fitting state, but are in a substantially separated state actually because the thermal stripping adhesive layer loses viscosity, when the bottle cap is opened, the sealing layer and the sealing layer can be easily separated, the pull lugs are exposed, and a user can tear the sealing layer through the pull lugs; after the bottle cap is used, the sealing layer can be left in the bottle cap, and after the bottle cap is closed, the sealing layer can perform a better resealing function on the plastic container (generally, double faced adhesive tape can be arranged on the inner surface of the bottle cap, or annular buckles are arranged on the inner side wall of the bottle cap, and the sealing layer is adhered or clamped in the bottle cap for fixing). When the electromagnetic sealing method is adopted to heat-seal the sealing gasket on the bottle mouth, the aluminum foil layer and the pull lugs can be hidden at the same time, and when the sealing layer and the sealing layer can be separated to expose the pull lugs, so that the sealing gasket has stronger integrity when being sealed, the opening of the container can be completely covered by the double-sided laminated foaming layer, the aluminum foil layer is not easy to be damaged due to stress, and the sealing gasket is attractive; simultaneously when tearing the closing layer, only need tear the individual layer structure, need not to tear the aluminium foil layer together, can not appear drawing the ear fracture, tear difficulty or seal the situation of the residual adhesion of border department aluminium foil layer, tear the convenience and can not adhere, enable the container opening and expose completely, be convenient for pour the material in the container to after the bottle lid closes, also can play the effect of resealing.
In the preferred scheme, in the step (5), the aluminum foil layer and the heat conducting layer form a single-sided directional heating structure, and when electromagnetic induction causes the aluminum foil layer to heat, the aluminum foil layer directionally transmits heat downwards to the thermal stripping adhesive layer. The aluminum foil layer is oriented to transfer heat downwards, so that the sealing layer is heat-sealed at the bottle mouth, and the heat sealing effect is better.
In a further preferred scheme, the aluminum foil layer and the heat conducting layer form a single-sided directional heating structure in the following manner: the second film layer adopts a polyester film layer. The polyester film has stronger heat insulation capability, and when the sealing layer is heat-sealed at the bottle mouth, the polyester film can separate heat, so that the single-sided directional heating structure can be formed by matching with the aluminum foil layer and the heat conducting layer.
In a preferred embodiment, in the step (1), when the material of the first film layer is the same as that of the foaming layer, the first film layer is compounded on the upper surface of the foaming layer in the following manner: the first film layer is directly heat-sealed on the upper surface of the foaming layer. For example, if the foam layer is a PE foam layer, the first film layer is also a PE film; if a PP foam layer is used for the foam layer, a PP film is also used for the first film layer.
In another preferred embodiment, in the step (1), when the material of the first film layer is not the same as that of the foaming layer, the first film layer is compounded on the upper surface of the foaming layer in the following manner: the first film layer is compounded on the upper surface of the foaming layer through glue. Typically, the second film layer is also laminated to the lower surface of the foam layer by glue.
The sealing layer is generally made of the same material as the plastic container, for example, a polyester film.
The invention has the beneficial effects that: the sealing gasket manufactured by the electromagnetic sealing method can hide the aluminum foil layer and the pull lug, and when the sealing layer and the sealing layer are required to be torn, the pull lug can be separated, so that the sealing gasket has stronger integrity when being sealed, the opening of the container can be completely covered by the double-sided laminated foaming layer, the aluminum foil layer is not easy to be damaged due to stress, and the sealing gasket is attractive; simultaneously when tearing the closing layer, only need tear the individual layer structure, need not to tear the aluminium foil layer together, can not appear drawing the ear fracture, tear difficulty or seal the situation of the residual adhesion of border department aluminium foil layer, tear the convenience and can not adhere, enable the container opening and expose completely, be convenient for pour the material in the container to after the bottle lid closes, also can play the effect of resealing.
Drawings
FIG. 1 is a cross-sectional view of a gasket seal made by the manufacturing process of the present invention in example 1;
FIG. 2 is a cross-sectional view of the sealing layer in the bottle cap according to example 1 of the present invention;
fig. 3 is a schematic structural view of the embodiment 1 of the present invention when the tab is folded;
fig. 4 is a schematic diagram of the structure of the pull tab according to embodiment 1 of the present invention.
Detailed Description
The invention is further described with reference to the drawings and the specific embodiments below:
example 1
An electromagnetic sealing method for hiding an aluminum foil layer and a pull lug comprises the following steps:
step (1), a first film layer 1011 and a second film layer 1013 are respectively combined on the upper and lower surfaces of the foam layer 1012 to form a second double-sided composite film foam layer 101;
step (2), compounding an aluminum foil layer 102 on the lower surface of the second double-sided film-coating foaming layer 101;
step (3), compounding a heat conducting layer 103 on the lower surface of the aluminum foil layer 102, wherein the second double-sided laminated foaming layer 101, the aluminum foil layer 102 and the heat conducting layer 103 jointly form a sealing layer 1;
step (4), dividing the sealing film layer into an ear pulling part 301 and a sealing part 302, turning up the ear pulling part 301 and attaching the ear pulling part 301 to the upper surface of the sealing part 302, and forming a sealing layer 3 by the sealing part 302 and the ear pulling part 301;
step (5), coating a heat stripping adhesive layer 2 on the upper surface of the sealing layer 3;
step (6), the lower surface of the sealing layer 1 is attached to the upper surface of the sealing layer 3 through the heat stripping adhesive layer 2 to form a sealing sheet;
step (7), punching and shearing the sealing sheet material into sealing gaskets according to the specification of the bottle mouth;
step (8), placing the sealing gasket in the bottle cap 4, and screwing the bottle cap 4 at the opening of the bottle;
and (9) heating the aluminum foil layer 102 by adopting electromagnetic induction, and transferring heat to the thermal stripping adhesive layer 2 and the sealing layer 3 by the aluminum foil layer 102 in a heat transfer mode, so that the sealing layer 3 is thermally sealed on the bottle mouth.
As shown in fig. 1, in the electromagnetic sealing method, a sealing layer 1 and a sealing layer 3 are bonded together by adopting a heat-stripping adhesive layer 2 to form a sealing gasket; when the sealing gasket is placed in the bottle cap 4 and is covered on the bottle mouth for screwing, and then the sealing layer 3 is thermally sealed on the bottle mouth by adopting electromagnetic induction, the heat conduction layer 103 transmits heat to the thermal stripping adhesive layer 2, the thermal stripping adhesive layer 2 loses viscosity when being cooled after being heated, so that the sealing layer 3 is adhered to the bottle mouth of the plastic container, and the sealing layer 1 and the sealing layer 3 are in a close-fitting state, but are in a substantially separated state actually because the thermal stripping adhesive layer 2 loses viscosity, as shown in fig. 2-4, when the bottle cap 4 is opened, the sealing layer 1 and the sealing layer 3 can be easily separated, the pulling lugs are exposed, and a user can tear the sealing layer 3 through the pulling lugs; after the use, the sealing layer 1 can be left in the bottle cap 4, and when the bottle cap 4 is closed, the sealing layer 1 can perform a better resealing function on the plastic container (the bottle cap 4 is provided with an annular buckle on the inner side wall, and the sealing layer 1 is clamped in the bottle cap 4 for fixing). When the electromagnetic sealing method is adopted to seal the sealing gasket on the bottle mouth, the aluminum foil layer 102 and the pull lugs can be hidden at the same time, and when the sealing layer 1 and the sealing layer 3 are required to be torn, the pull lugs can be separated, so that the sealing gasket has stronger integrity when being sealed, the opening of the container can be completely covered by the second double-sided film-coated foaming layer 101, the aluminum foil layer 102 is not easy to be damaged due to stress, and the appearance is attractive; meanwhile, when the sealing layer 3 is torn, only the single-layer structure is required to be torn, the aluminum foil layer 102 is not required to be torn together, the conditions of breaking of pull lugs, difficult tearing or residual adhesion of the aluminum foil layer 102 at the edge of the seal are avoided, the tearing is convenient, the adhesion is avoided, the opening of the container is completely exposed, the material in the container is convenient to pour out, and the resealing effect can be achieved after the bottle cap 4 is closed.
In step (5), the aluminum foil layer 102 and the heat conducting layer 103 form a single-sided directional heating structure, and when electromagnetic induction causes the aluminum foil layer 102 to generate heat, the aluminum foil layer 102 directionally transfers the heat downwards to the thermal stripping adhesive layer 2. The aluminum foil layer 102 is oriented to transfer heat downwards so as to heat seal the sealing layer 3 at the bottle mouth, and the heat seal effect is better.
The aluminum foil layer 102 and the heat conducting layer 103 form a single-sided directional heating structure in the following manner: the second film layer 1013 is a polyester film layer. The polyester film has stronger heat insulation capability, and when the sealing layer 3 is heat-sealed at the bottle mouth, the polyester film can separate heat, so that a single-sided directional heating structure can be formed by matching the aluminum foil layer 102 and the heat conducting layer 103.
In the step (1), the material of the first film layer 1011 is the same as that of the foam layer 1012, and the first film layer 1011 is directly heat-sealed on the upper surface of the foam layer 1012. For example, if the foam layer 1012 is a PE foam layer 1012, then the first film layer 1011 is also a PE film; if the foam layer 1012 is a PP foam layer 1012, the first film layer 1011 is also a PP film.
Example 2
This embodiment differs from embodiment 1 in that: in the step (1), the material of the first film layer is not the same as that of the foaming layer, and the first film layer and the second film layer are respectively compounded on two sides of the foaming layer through glue.
Claims (5)
1. An electromagnetic sealing method for hiding an aluminum foil layer and a pull lug is characterized by comprising the following steps:
step (1), respectively compounding a first film layer and a second film layer on the upper surface and the lower surface of the foaming layer to form a double-sided laminated foaming layer;
step (2), compounding an aluminum foil layer on the lower surface of the double-sided laminated foaming layer;
step (3), compounding a heat conduction layer on the lower surface of the aluminum foil layer, wherein the double-sided laminated foaming layer, the aluminum foil layer and the heat conduction layer together form a sealing layer;
dividing the sealing film layer into a sealing part and a pulling lug part, and upwards turning the pulling lug part and attaching the pulling lug part to the upper surface of the sealing part, wherein the sealing part and the pulling lug part jointly form a sealing layer;
step (5), coating a heat stripping adhesive layer on the upper surface of the sealing layer;
step (6), the lower surface of the sealing layer is attached to the upper surface of the sealing layer through a thermal stripping adhesive layer to form a sealing sheet;
step (7), punching and shearing the sealing sheet material into sealing gaskets according to the specification of the bottle mouth;
step (8), placing the sealing gasket in the bottle cap, and screwing the bottle cap at the opening of the bottle;
and (9) heating the aluminum foil layer by adopting electromagnetic induction, and transferring heat to the thermal stripping adhesive layer and the sealing layer by the aluminum foil layer in a heat transfer mode, so that the sealing layer is thermally sealed on the bottle mouth.
2. An electromagnetic sealing method for hiding an aluminum foil layer and pull tab as claimed in claim 1, wherein: in the step (5), the aluminum foil layer and the heat conducting layer form a single-sided directional heating structure, and when electromagnetic induction causes the aluminum foil layer to heat, the aluminum foil layer directionally transmits heat downwards to the thermal stripping adhesive layer.
3. An electromagnetic sealing method for hiding an aluminum foil layer and pull tab as claimed in claim 2, wherein: the aluminum foil layer and the heat conduction layer form a single-sided directional heating structure in the following manner: the second film layer adopts a polyester film layer.
4. An electromagnetic sealing method for hiding an aluminum foil layer and pull tab as claimed in claim 1, wherein: in the step (1), when the material of the first film layer is the same as that of the foaming layer, the first film layer is compounded on the upper surface of the foaming layer in the following manner: the first film layer is directly heat-sealed on the upper surface of the foaming layer.
5. An electromagnetic sealing method for hiding an aluminum foil layer and pull tab as claimed in claim 1, wherein: in the step (1), when the material of the first film layer is not the same as that of the foaming layer, the first film layer is compounded on the upper surface of the foaming layer in the following manner: the first film layer is compounded on the upper surface of the foaming layer through glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311267416.5A CN117262312A (en) | 2023-09-28 | 2023-09-28 | Electromagnetic sealing method for hiding aluminum foil layer and pull lugs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311267416.5A CN117262312A (en) | 2023-09-28 | 2023-09-28 | Electromagnetic sealing method for hiding aluminum foil layer and pull lugs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117262312A true CN117262312A (en) | 2023-12-22 |
Family
ID=89207795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311267416.5A Pending CN117262312A (en) | 2023-09-28 | 2023-09-28 | Electromagnetic sealing method for hiding aluminum foil layer and pull lugs |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117262312A (en) |
-
2023
- 2023-09-28 CN CN202311267416.5A patent/CN117262312A/en active Pending
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