CN213895704U - Anti-warping PET (polyethylene terephthalate) protective film - Google Patents
Anti-warping PET (polyethylene terephthalate) protective film Download PDFInfo
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- CN213895704U CN213895704U CN202022590062.6U CN202022590062U CN213895704U CN 213895704 U CN213895704 U CN 213895704U CN 202022590062 U CN202022590062 U CN 202022590062U CN 213895704 U CN213895704 U CN 213895704U
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Abstract
The utility model provides a prevent PET protection film of curling up belongs to protection film technical field. The anti-warping PET protective film comprises a transparent polyester release film layer and a protective film component. The protection film subassembly includes the PET substrate layer and bordures the piece and links up the layer, bordure the piece including wear-resisting layer of borduring and splice groove, just the splice groove is provided with two, two the splice groove is seted up respectively wear-resisting layer both ends of borduring, two the splice groove inner wall has all glued organosilicon pressure sensitive adhesive layer I still, link up the layer both ends all be connected with corresponding the concatenation piece of concatenation groove looks adaptation, two the concatenation piece outer wall all with corresponding I adhesion of organosilicon pressure sensitive adhesive layer. The utility model discloses in, the protection film subassembly utilizes wear-resisting layer of borduring and linking layer cooperation can reduce each structural layer of PET protection film because glue coating is inhomogeneous or viscidity inefficacy takes place the probability of turn-up.
Description
Technical Field
The utility model relates to a protection film field particularly, relates to prevent PET protection film of curling up.
Background
The multilayer PET protective film is an adhesive tape structure which takes a PET film as a base material and is provided with an organic silicon sub-sensitive adhesive layer, and can be used for surface protection in the production process of batteries.
However, each layer of structure of the existing multilayer PET protective film is fixed by the adhesive layer, the condition that glue is not uniformly coated or the glue viscosity fails can be usually caused by the adhesive layer fixation, and the existing multilayer PET protective film lacks a good-effect anti-hemming structure, so that the service life of the multilayer PET protective film cannot be prolonged.
SUMMERY OF THE UTILITY MODEL
In order to compensate above not enough, the utility model provides a prevent PET protection film of curling up aims at improving the problem that current multilayer PET protection film lacks the better package edge sealing structure of coverability.
The utility model discloses a realize like this:
the utility model provides a prevent PET protection film of curling up, leave type rete and protective film subassembly including transparent polyester.
The protective film component comprises a PET (polyethylene terephthalate) substrate layer, an edge covering piece and a connecting layer, the edge covering piece comprises a wear-resistant edge covering layer and two splicing grooves, the two splicing grooves are respectively formed in the two ends of the wear-resistant edge covering layer, an organic silicon pressure-sensitive adhesive layer I is further bonded to the inner walls of the two splicing grooves, the two ends of the connecting layer are respectively connected with corresponding splicing blocks matched with the splicing grooves, the outer walls of the two splicing blocks are adhered to the corresponding organic silicon pressure-sensitive adhesive layer I, an organic silicon pressure-sensitive adhesive layer II is bonded to the bottom of the wear-resistant edge covering layer and the bottom of the connecting layer, the organic silicon pressure-sensitive adhesive layer II is adhered to the release film layer of the transparent polyester, and the PET substrate layer is adhered between the wear-resistant edge covering layer and the connecting layer.
In an embodiment of the present invention, the wear-resistant edge covering layer is a super-molecular polyethylene material layer, and the thickness of the wear-resistant edge covering layer is 0.020 mm.
The utility model discloses an in the embodiment, wear-resisting layer of borduring with longitudinal section after the concatenation of linking layer is the rectangle form setting, the linking layer specifically is the nanometer insulating layer, just the thickness of linking layer with the thickness on wear-resisting layer of borduring is the same.
In an embodiment of the present invention, the exposed outer surface of the wear-resistant edge covering layer is further coated with a corrosion-resistant coating.
In an embodiment of the utility model, wear-resisting layer of borduring inner wall both sides still all are connected with the plug block, two the plug block outer wall all adheres to and has had organosilicon pressure sensitive adhesive III.
The utility model discloses an in an embodiment, PET substrate layer both ends seted up with the inserting groove of inserted block looks adaptation, two organosilicon pressure sensitive adhesive III with correspond the inserting groove inner wall is hugged closely.
The utility model discloses an in the embodiment, two surfaces have all been coated with ya keli glue film I about the PET substrate layer, the thickness of PET substrate layer is 0.010mm, and the yakeli glue film I on upper portion still the adhesion has the waterproof layer.
The utility model discloses an in the embodiment, waterproof layer upper portion has still coated acrylic glue film II, and II adhesions of acrylic glue film are in wear-resisting bordure layer internal surface, the acrylic glue film I of lower part still adhesion has the silica gel buffer layer, silica gel buffer layer lower part has still coated acrylic glue film III, acrylic glue film III with wear-resisting bordure the layer with the linking layer binds firmly.
This prevent PET protection film of book perk still draws the subassembly including tearing, it is provided with a plurality of, every to tear the subassembly all includes tear strip and organosilicon pressure sensitive adhesive layer IV.
In an embodiment of the utility model, transparent polyester is seted up flutedly from type rete surface equidistance, organosilicon pressure sensitive adhesive layer IV coats the side in the recess, the tear strip passes through organosilicon pressure sensitive adhesive layer IV adhesion in the recess.
The utility model has the advantages that: the utility model discloses an above-mentioned design obtains prevents PET protection film of book perk, during the use, the splice piece that splice groove and linking layer both ends are connected that the utilization wear-resisting layer both ends of borduring were seted up can splice its the two, simultaneously with the help of the better organosilicon pressure sensitive adhesive layer I of splice piece outer wall cementation tear effect can increase the stability that wear-resisting layer of borduring and linking layer are connected, the cooperation setting of utilizing wear-resisting layer of borduring and linking layer simultaneously can play the effect of borduring of banding, cementation covers waterproof layer and PET substrate layer and silica gel buffer layer in its two inside, thereby reduce the structural layer of whole PET protection film because the uneven or viscidity inefficacy of glue coating and take place the probability of turn-up, and then be favorable to indirectly increasing PET protection film life.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural view of a warp-proof PET protective film provided by an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a protective film assembly according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a connection relationship between the wear-resistant edge covering layer and the connection layer according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a wrapping member according to an embodiment of the present invention;
FIG. 5 is a schematic view of a connection relationship between a connection layer and a splicing block according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a partially enlarged structure at a in fig. 3 according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a partially enlarged structure at a position B in fig. 3 according to an embodiment of the present invention;
fig. 8 is a schematic structural view of a section connection relationship between the waterproof layer and the PET substrate layer and between the waterproof layer and the silica gel buffer layer according to an embodiment of the present invention;
fig. 9 is a schematic structural view of a cross-sectional connection relationship between the tearing assembly and the transparent polyester release film layer according to an embodiment of the present invention;
fig. 10 is a schematic structural view of a position relationship between the organic silicon pressure-sensitive adhesive layer iv and the transparent polyester release film layer provided by the embodiment of the present invention.
In the figure: 10-a transparent polyester release film layer; 20-a protective membrane module; 210-a PET substrate layer; 220-a binding piece; 221-wear-resistant edge covering layer; 222-splicing groove; 223-organic silicon pressure-sensitive adhesive layer I; 224-corrosion resistant coating; 225-plug-in block; 226-silicone pressure-sensitive adhesive III; 230-a tie layer; 240-splicing blocks; 250-organic silicon pressure sensitive adhesive layer II; 260-a plug groove; 270-waterproof layer; 280-a silica gel buffer layer; 30-a tear-off assembly; 310-a tear strip; 320-organic silicon pressure sensitive adhesive layer IV.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Examples
Referring to fig. 1, the utility model provides a PET protective film for preventing curling, which comprises a transparent polyester release film layer 10 and a protective film component 20.
The lower surface of the transparent polyester release film layer 10 is provided with the tearing assembly 30, so that the transparent polyester release film layer 10 and the protective film assembly 20 can be conveniently and quickly separated, the probability of damage to the PET protective film caused by hard tearing of the transparent polyester release film layer 10 by a fingernail is reduced, and the use effect of the PET protective film can be indirectly improved; the protective film component 20 can play a role in edge sealing and edge covering by utilizing the matching of the wear-resistant edge covering layer 221 and the connecting layer 230, and the waterproof layer 270, the PET substrate layer 210 and the silica gel buffer layer 280 are adhered and covered in the two inner parts, so that the probability of edge curling of the structural layer of the whole PET protective film due to uneven glue coating or viscous failure is reduced, and the service life of the PET protective film is prolonged indirectly.
Referring to fig. 1 to 8, the protective film assembly 20 includes a PET substrate layer 210, an edge covering piece 220 and a connecting layer 230, the edge covering piece 220 includes a wear-resistant edge covering layer 221 and a splicing groove 222, wherein the wear-resistant edge covering layer 221 is specifically a super-molecular polyethylene material layer, and the wear-resistant edge covering layer 221 can play a wear-resistant role and reduce the probability of friction damage of the PET protective film. The thickness of wear-resisting layer 221 of borduring is 0.020mm, and the longitudinal section after wear-resisting layer 221 and the concatenation of linkage layer 230 sets up for the rectangle form, and linkage layer 230 specifically is the nanometer insulating layer, utilizes the setting of linkage layer 230 can further promote the heat-proof quality of PET protection film. The thickness of the connecting layer 230 is the same as that of the wear-resistant covering layer 221, the outer surface of the wear-resistant covering layer 221 exposed out is coated with the corrosion-resistant coating 224, and the corrosion resistance of the PET protective film can be improved by the corrosion-resistant coating 224.
The two splicing grooves 222 are respectively arranged at two ends of the wear-resistant edge covering layer 221, the inner walls of the two splicing grooves 222 are respectively adhered with an organic silicon pressure-sensitive adhesive layer I223, two ends of the connecting layer 230 are respectively connected with splicing blocks 240 matched with the corresponding splicing grooves 222, the outer walls of the two splicing blocks 240 are adhered with the corresponding organic silicon pressure-sensitive adhesive layers I223, wherein the splicing grooves 222 arranged at the two ends of the wear-resistant edge covering layer 221 and the splicing blocks 240 connected with the two ends of the connecting layer 230 can be spliced, meanwhile, the stability of connection between the wear-resistant edge covering layer 221 and the connecting layer 230 can be improved by virtue of the organic silicon pressure-sensitive adhesive layers I223 with good tearing-resistant effect adhered to the outer walls of the splicing blocks 240, meanwhile, the edge-sealing and edge covering effect can be achieved by utilizing the matching arrangement of the wear-resistant edge covering layer 221 and the connecting layer 230, the waterproof layer 270, the PET substrate layer 210 and the silica gel buffer layer 280 are covered inside the two, thereby reducing the probability of curling of the structural layer of the whole PET protective film due to uneven glue coating or viscous failure.
And the organosilicon pressure-sensitive adhesive layer II 250 is adhered to the bottom outer wall of the wear-resistant edge covering layer 221 and the bottom of the connecting layer 230, and the organosilicon pressure-sensitive adhesive layer II 250 is adhered to the transparent polyester release film layer 10, wherein the adhesion performance of the organosilicon pressure-sensitive adhesive layer II 250 and the transparent polyester release film layer 10 can be improved by utilizing the organosilicon pressure-sensitive adhesive layer II 250 with stronger corrosion resistance and adhesion performance. The PET substrate layer 210 is adhered between the wear-resistant edge covering layer 221 and the tie layer 230.
Wear-resisting layer 221 inner wall both sides still all are connected with the piece 225 of pegging graft, and wherein, two pieces 225 of pegging graft all set up with wear-resisting layer 221 integrated into one piece. Two plug-in blocks 225 outer walls all adhere to and have had organosilicon pressure sensitive adhesive III 226, the inserting groove 260 with inserting block 225 looks adaptation is seted up at PET substrate layer 210 both ends, two organosilicon pressure sensitive adhesive III 226 are hugged closely with the inserting groove 260 inner wall that corresponds, the cooperation that utilizes inserting groove 260 and inserting block 225 can be pegged graft wear-resisting layer of borduring 221 and the PET substrate layer 210 among the prior art fast, utilize the stronger organosilicon pressure sensitive adhesive III 226 of cohesiveness to increase the stability of its two connections simultaneously. The two surfaces all coat about the PET substrate layer 210 has ya keli glue film I, and the thickness of PET substrate layer 210 is 0.010mm, and the yakeli glue film I on upper portion still adheres there is waterproof layer 270, can increase the holistic waterproof performance of PET protection film through the setting of waterproof layer 270.
The waterproof layer 270 upper portion has acrylic glue film II that still coats, and the II adhesions of acrylic glue film are at wear-resisting layer 221 internal surface of borduring, and the I adhesion of acrylic glue film of lower part has silica gel buffer layer 280 still, and wherein, the buffering shock attenuation performance that utilizes silica gel buffer layer 280 can increase the PET protection film, and then is favorable to protecting its battery of parcel. The lower portion of the silica gel buffer layer 280 is coated with an acrylic adhesive layer III, the acrylic adhesive layer III is adhered to the wear-resistant edge covering layer 221 and the connecting layer 230, and the heat-resistant and flame-retardant effects can be achieved by the aid of the acrylic adhesive layer II, the acrylic adhesive layer I and the acrylic adhesive layer III.
Please refer to fig. 1, 9, and 10, the anti-warping PET protective film further includes a tearing assembly 30, the tearing assembly 30 is provided with a plurality of tearing assemblies, each tearing assembly 30 includes a tearing strip 310 and an organic silicon pressure sensitive adhesive layer iv 320, the outer surface of the transparent polyester release film layer 10 is provided with a groove at an equal distance, the organic silicon pressure sensitive adhesive layer iv 320 is coated on the inner side of the groove, the tearing strip 310 is adhered in the groove through the organic silicon pressure sensitive adhesive layer iv 320, wherein a handheld groove is reserved when each tearing strip 310 and the corresponding organic silicon pressure sensitive adhesive layer iv 320 are adhered, the transparent polyester release film layer 10 can be conveniently torn by using the handheld groove, and the probability that the PET protective film is damaged by hard tearing of the transparent polyester release film layer 10 by using a fingernail is reduced.
The working principle of the anti-warping PET protective film is as follows: when the PET protective film is used, the corrosion resistance of the PET protective film can be improved by using the corrosion-resistant coating layer 224, the wear-resistant edge covering layer 221 can play a wear-resistant role, the probability of friction damage of the PET protective film is reduced, the overall waterproof performance of the PET protective film can be improved by arranging the waterproof layer 270, the buffering and damping performance of the PET protective film can be improved by using the silica gel buffer layer 280, so that the wrapped battery can be protected, meanwhile, the heat-resistant and flame-retardant effects can be achieved by using the acrylic adhesive layer II, the acrylic adhesive layer I and the acrylic adhesive layer III which are adhered among the wear-resistant edge covering layer 221, the waterproof layer 270, the PET substrate layer 210 and the silica gel buffer layer 280, the joining layer 230 is specifically a nano heat-insulating layer, the heat-insulating performance of the PET protective film can be further improved by arranging the joining layer 230, and the joining layer 221 and the joining layer 230 can be spliced by using the splicing grooves 222 formed at the two ends of the wear-resistant edge covering layer 221 and the splicing blocks 240 connected at the two ends of the joining layer 230, meanwhile, the stability of connection between the wear-resistant edge covering layer 221 and the connecting layer 230 can be improved by means of the organosilicon pressure-sensitive adhesive layer I223 with good tearing-resistant effect adhered to the outer wall of the splicing block 240, the edge sealing and edge covering effect can be achieved by means of the matching arrangement of the wear-resistant edge covering layer 221 and the connecting layer 230, the waterproof layer 270, the PET substrate layer 210 and the silica gel buffer layer 280 are adhered and covered inside the waterproof layer and the PET substrate layer, so that the probability of edge curling of the structural layer of the whole PET protective film due to uneven glue coating or viscous failure is reduced, the service life of the PET protective film is prolonged indirectly, grooves are formed in the bottom surface of the transparent polyester release film layer 10 at equal intervals, the edge of each groove is coated with an organosilicon pressure-sensitive adhesive layer IV 320, rectangular tearing strips 310 can be adhered by means of the organosilicon pressure-sensitive adhesive layer IV 320, and a handheld groove is reserved when each tearing strip 310 is adhered to the corresponding organosilicon pressure-sensitive adhesive layer IV 320, utilize the setting in this handheld groove can conveniently tear transparent polyester from type rete 10, reduce and tear transparent polyester from type rete 10 with the fingernail firmly and bring the probability of damaging for the PET protection film, and then be favorable to indirectly increasing the result of use of PET protection film.
It should be noted that the selection of the length of the wear-resistant edge covering layer 221, the specific specification of the tear strip 310, and the specific model thickness of the waterproof layer 270 need to be determined by type selection according to the actual specification of the device, and the specific type selection calculation method adopts the prior art in the field, so detailed description is omitted.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The PET protective film for preventing curling is characterized by comprising
A transparent polyester release film layer (10);
the protective film assembly (20) comprises a PET (polyethylene terephthalate) base material layer (210), a wrapping part (220) and a connecting layer (230), the wrapping part (220) comprises a wear-resistant wrapping layer (221) and splicing grooves (222), two splicing grooves (222) are arranged, the two splicing grooves (222) are respectively arranged at two ends of the wear-resistant wrapping layer (221), organic silicon pressure-sensitive adhesive layers I (223) are respectively adhered to the inner walls of the two splicing grooves (222), splicing blocks (240) matched with the corresponding splicing grooves (222) are respectively connected to two ends of the connecting layer (230), the outer walls of the two splicing blocks (240) are respectively adhered to the corresponding organic silicon pressure-sensitive adhesive layers I (223), organic silicon pressure-sensitive adhesive layers II (250) are respectively adhered to the bottom outer wall of the wear-resistant wrapping layer (221) and the bottom of the connecting layer (230), and the organic silicon pressure-sensitive adhesive layers II (250) are adhered to the transparent polyester release film layer (10), the PET substrate layer (210) is fixedly adhered between the wear-resistant edge covering layer (221) and the connecting layer (230).
2. The protective film of PET against curling as claimed in claim 1, wherein said wear-resistant layer of edging (221) is in particular a layer of supramolecular polyethylene material, said wear-resistant layer of edging (221) having a thickness of 0.020 mm.
3. The anti-curling PET protective film according to claim 1, wherein the longitudinal section of the anti-curling layer (221) and the joint layer (230) after being spliced is rectangular, the joint layer (230) is specifically a nano heat insulation layer, and the thickness of the joint layer (230) is the same as that of the anti-curling layer (221).
4. The anti-curling PET protective film according to claim 1, wherein the exposed outer surface of the wear-resistant edging layer (221) is further coated with a corrosion-resistant coating (224).
5. The anti-curling PET protective film according to claim 1, wherein insertion blocks (225) are further connected to two sides of the inner wall of the wear-resistant edge covering layer (221), and silicone pressure-sensitive adhesive III (226) is adhered to the outer walls of the two insertion blocks (225).
6. The anti-curling PET protective film according to claim 5, wherein insertion grooves (260) matched with the insertion blocks (225) are formed in two ends of the PET substrate layer (210), and the two silicone pressure-sensitive adhesives III (226) are tightly attached to the corresponding inner walls of the insertion grooves (260).
7. The anti-curling PET protective film according to claim 1, wherein the upper surface and the lower surface of the PET substrate layer (210) are coated with an acrylic adhesive layer I, the thickness of the PET substrate layer (210) is 0.010mm, and the upper acrylic adhesive layer I is further adhered with a waterproof layer (270).
8. The anti-warping PET protection film according to claim 7, wherein the upper portion of the waterproof layer (270) is further coated with an acrylic glue layer II, the acrylic glue layer II is adhered to the inner surface of the wear-resistant edge covering layer (221), the acrylic glue layer I on the lower portion is further adhered with a silica gel buffer layer (280), the lower portion of the silica gel buffer layer (280) is further coated with an acrylic glue layer III, and the acrylic glue layer III adheres to the wear-resistant edge covering layer (221) and the connecting layer (230).
9. The anti-curling PET protective film according to claim 1, further comprising a tearing assembly (30), wherein the tearing assembly (30) is provided in a plurality, and each tearing assembly (30) comprises a tearing strip (310) and a silicone pressure-sensitive adhesive layer IV (320).
10. The anti-curling PET protective film according to claim 9, wherein grooves are formed in the outer surface of the transparent polyester release film layer (10) at equal intervals, the organic silicon pressure-sensitive adhesive layer IV (320) is coated on the inner side edge of each groove, and the tearing strip (310) is adhered to the grooves through the organic silicon pressure-sensitive adhesive layer IV (320).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022590062.6U CN213895704U (en) | 2020-11-10 | 2020-11-10 | Anti-warping PET (polyethylene terephthalate) protective film |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022590062.6U CN213895704U (en) | 2020-11-10 | 2020-11-10 | Anti-warping PET (polyethylene terephthalate) protective film |
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| CN213895704U true CN213895704U (en) | 2021-08-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115230245A (en) * | 2022-06-23 | 2022-10-25 | 宜兴市宇龙塑胶包装制品有限公司 | Heat-insulation card-protecting film and preparation method thereof |
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2020
- 2020-11-10 CN CN202022590062.6U patent/CN213895704U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115230245A (en) * | 2022-06-23 | 2022-10-25 | 宜兴市宇龙塑胶包装制品有限公司 | Heat-insulation card-protecting film and preparation method thereof |
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