CN217671558U - Composite film and packaging bag - Google Patents
Composite film and packaging bag Download PDFInfo
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- CN217671558U CN217671558U CN202122157133.8U CN202122157133U CN217671558U CN 217671558 U CN217671558 U CN 217671558U CN 202122157133 U CN202122157133 U CN 202122157133U CN 217671558 U CN217671558 U CN 217671558U
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- composite film
- evoh
- packaging bag
- ultraviolet
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- 239000002131 composite material Substances 0.000 title claims abstract description 55
- 238000004806 packaging method and process Methods 0.000 title claims description 59
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims abstract description 38
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000004715 ethylene vinyl alcohol Substances 0.000 claims abstract description 38
- 230000000903 blocking effect Effects 0.000 claims abstract description 25
- 238000001125 extrusion Methods 0.000 claims abstract description 19
- 238000013329 compounding Methods 0.000 claims abstract description 4
- 230000004888 barrier function Effects 0.000 claims description 17
- 239000004698 Polyethylene Substances 0.000 claims description 10
- 239000012528 membrane Substances 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 93
- 235000015067 sauces Nutrition 0.000 description 17
- 239000000463 material Substances 0.000 description 13
- 230000003647 oxidation Effects 0.000 description 11
- 238000007254 oxidation reaction Methods 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000004519 grease Substances 0.000 description 7
- 239000012790 adhesive layer Substances 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 239000004594 Masterbatch (MB) Substances 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- 235000013305 food Nutrition 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- 241000207961 Sesamum Species 0.000 description 3
- 235000003434 Sesamum indicum Nutrition 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003205 fragrance Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 235000021400 peanut butter Nutrition 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 229910052684 Cerium Inorganic materials 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 235000019198 oils Nutrition 0.000 description 2
- 239000005022 packaging material Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000008172 hydrogenated vegetable oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Landscapes
- Packages (AREA)
- Bag Frames (AREA)
- Wrappers (AREA)
Abstract
The embodiment of this specification provides a complex film and wrapping bag, includes: the composite film comprises an ultraviolet blocking layer, a PA layer and an EVOH co-extrusion layer, wherein the composite film is formed by sequentially compounding the ultraviolet blocking layer, the PA layer and the EVOH co-extrusion layer.
Description
Technical Field
The embodiment of the specification relates to the technical field of food packaging, in particular to a composite film and a packaging bag.
Background
In the sauce package field, most of packaging materials are aluminum-based composite packages, and the sauce package has the advantages of effectively solving the problem of sealing property and blocking the oxidation of contents by ultraviolet rays. The defects are that the aluminum foil is easy to break in the packaging and transporting process, the material has high hardness and is easy to scratch in the using process, the aluminum foil has no light transmittance, and the contents are invisible, so that the selection of shoppers is greatly disturbed.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiments of the present disclosure provide a composite film and a packaging bag, so as to solve the technical defects that the prior art sauce packaging cannot simultaneously provide the requirements of high air tightness, high temperature resistance, low temperature resistance, good barrier property, ultraviolet oxidation barrier property, and visual content requirements.
According to a first aspect of embodiments herein, there is provided a composite membrane comprising: ultraviolet barrier layer, PA layer, EVOH crowd the layer altogether, wherein, the complex film is formed by ultraviolet barrier layer, PA layer, EVOH crowd the layer altogether in proper order complex.
Optionally, the composite membrane further comprises: the ultraviolet barrier layer is connected with the PA layer through the bonding layer, and the PA layer is connected with the EVOH co-extrusion layer through the high-temperature resistant bonding layer.
Optionally, the ultraviolet blocking layer is a QUVPET ultraviolet blocking layer, wherein the QUVPET ultraviolet blocking layer is prepared by adding QUV3000h biological nanometer ultraviolet-proof master batch.
Optionally, the EVOH co-extruded layer sequentially comprises: PE layer, PA layer, EVOH layer, PE layer, PA layer, PE layer, wherein, the middle of each layer is all connected through TIE bonding resin layer.
Optionally, the thickness of the PA layer is 10-50um, and the thickness of the EVOH co-extruded layer is 90-120um.
Optionally, the EVOH content in the EVOH co-extruded layer is 15%.
According to a second aspect of embodiments herein, there is provided a packaging bag comprising: the packaging bag comprises a packaging bag body, wherein the packaging bag body is made of the composite film.
Optionally, the packaging bag further comprises: the transparent windowing is arranged at the lower part of the packaging bag body, and the area of the transparent windowing occupies less than one half of the packaging bag body.
Optionally, the packaging bag further comprises: and the suction nozzle is arranged at the upper part of the packaging bag body.
One embodiment of the specification realizes a composite film and a packaging bag, wherein an ultraviolet ray blocking layer is adopted in a combined layer of the composite film to block ultraviolet rays, and when the composite film is subsequently applied to the packaging bag, the ultraviolet ray blocking film can solve the technical problem of ultraviolet ray oxidation of contents after the packaging bag is opened, the freshness of a product is prolonged, and the fragrance of the product is ensured to be more durable; secondly, the PA layer is adopted in the combined layer of the composite film, so that the flexibility of the product can be increased, repeated kneading is realized, no crack is generated, and the problem of sauce leakage caused by package breakage during package transportation can be effectively solved; in addition, an EVOH co-extrusion layer is adopted in a combination layer of the composite film, and the composite film has high water vapor and oxygen barrier property and grease resistance and effectively ensures the shelf life of contents through the characteristics of the EVOH co-extrusion layer.
Drawings
FIG. 1 is a diagram of a composite membrane provided in one embodiment of the present disclosure;
fig. 2 is a structural view of a packaging bag according to an embodiment of the present disclosure.
Reference numerals
1-a layer of an ultraviolet-blocking layer,
a layer of 2-PA, and a layer of,
3-an EVOH co-extrusion layer is arranged,
4-the main body of the packaging bag,
5-a transparent window is opened on the surface,
6-suction nozzle.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present specification. This description may be implemented in many ways other than those specifically set forth herein, and those skilled in the art will appreciate that the present description is susceptible to similar generalizations without departing from the scope of the description, and thus is not limited to the specific implementations disclosed below.
The terminology used in the description of the one or more embodiments is for the purpose of describing the particular embodiments only and is not intended to be limiting of the description of the one or more embodiments. As used in one or more embodiments of the present specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used in one or more embodiments of the present specification refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, etc. may be used herein in one or more embodiments to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, a first can be termed a second and, similarly, a second can be termed a first without departing from the scope of one or more embodiments of the present description. The word "if," as used herein, may be interpreted as "at \8230; \8230when" or "when 8230; \823030when" or "in response to a determination," depending on the context.
The composite film is formed by compounding film materials with different properties, and through researching the properties of different materials and continuously testing a combination mode and an adhesion mode, in order to enable the composite film to achieve good effects on oxygen permeability, water permeability and ultraviolet prevention and break through the difficulty that a common transparent composite film cannot store high-grease sauce, the embodiment of the specification provides the composite film to solve the problems.
In the sauce package field, most of packaging materials are aluminum-based composite packages, and the sauce package has the advantages of effectively solving the problem of sealing property and blocking the oxidation of contents by ultraviolet rays. The defects are that the aluminum foil is easy to break in the packaging and transporting process, the material has high hardness and is easy to scratch in the using process, the aluminum foil has no light transmittance, and the contents are invisible, so that the selection of shoppers is greatly disturbed. Because sauce material packing needs have high gas tightness, high temperature resistant, low temperature resistant, the separation nature is good, the characteristics of separation ultraviolet oxidation, and still need satisfy consumer's aesthetic and to the visual demand of content, based on this, the wrapping bag that this specification embodiment provided to solve sauce material packing and can not provide simultaneously and satisfy high gas tightness, high temperature resistant, low temperature resistant, the separation nature is good, the problem of separation ultraviolet oxidation and the visual demand of content.
In this specification, a composite film and a packaging bag are provided, and are described in detail in the following examples one by one.
The present description provides an example, and referring to fig. 1, fig. 1 shows a structural diagram of a composite membrane provided according to an example of the present description.
Specifically, the composite membrane in fig. 1 includes: ultraviolet barrier layer 1, PA layer 2, EVOH crowd layer 3 altogether, wherein, the complex film is formed by ultraviolet barrier layer, PA layer, the EVOH crowd layer complex in proper order.
The ultraviolet blocking layer 1 is a QUVPET ultraviolet blocking layer, wherein the QUVPET ultraviolet blocking layer is prepared by adding QUV3000h biological nanometer ultraviolet-proof master batch.
In specific implementation, the ultraviolet blocking degree of the QUVPET ultraviolet blocking layer can be more than or equal to 99 percent under the condition that the ultraviolet blocking wave band is 200-380 nm. In practical application, the specific parameters of the ultraviolet-proof masterbatch can be seen in the following table 1:
TABLE 1
| Name of article | Ultraviolet-proof master batch |
| (Code) | U100-PET/PC/PMMA (customizable substrate) |
| Appearance of the product | Yellowish particles |
| Ultraviolet blocking band | 200-380nm |
| Effective solid content (%) | 5 |
| Melt index (MI, dL/g) | 9.0±1.0 |
| Intrinsic viscosity (IV, g/10 min) | 0.52±0.05 |
| Melting Point (. Degree.C.) | 260±10 |
| Water content (%) | ≤0.03 |
| Haze (%) | <1 |
| Density (g/cm) 3 ) | 1.42 |
| Hundred gram weight (g) | 2.14 |
Specifically, the QUVPET UV barrier layer is prepared by the following preparation method: the preparation method comprises the steps of preparing the nano cerium colloid, preparing the nano cerium polyester PET slice, drawing a film for co-extrusion molding and the like, and the film is drawn and molded by using a biaxial stretching three-layer co-extrusion device. The QUVPET ultraviolet barrier layer prepared by the preparation method has good transparency, the VLT is more than 88 percent, the ultraviolet absorptivity is 100 percent, the long-acting weatherability is good, and the QUB is more than 2000 hours.
The composite film in the embodiment of the present specification can block the problem of ultraviolet oxidation by using an ultraviolet blocking layer.
In order to ensure that the composite film has high water vapor and oxygen barrier property, oil and grease resistance and flexibility, the composite film also adopts a PA layer and an EVOH co-extrusion layer so as to realize the technical effects, wherein the PA layer thickness of the PA layer 2 is 10-50um, and the EVOH co-extrusion layer 3 is 90-120um.
In practical application, the thickness of the PA layer and the thickness of the EVOH co-extrusion layer only provide one range for reference, and the thicknesses of the PA layer and the EVOH co-extrusion layer can be adjusted within the range according to practical application requirements, but the embodiment is not limited to this.
Furthermore, in order to achieve the effects of high water vapor and oxygen barrier property and grease resistance, the EVOH co-extruded layer 3 sequentially comprises: PE layer, PA layer, EVOH layer, PE layer, PA layer, PE layer, wherein, each layer is connected through TIE bonding resin layer in the middle.
In specific implementation, the multilayer PA layer, the multilayer PE layer and the EVOH layer are added in the EVOH co-extruded layer so as to solve the problems of water vapor and oxygen barrier property and oil and grease resistance.
The EVOH coextruded layer 3 contains 15% of EVOH.
In addition, the composite film comprises an ultraviolet blocking layer, a PA layer and an EVOH co-extrusion layer, and also comprises an adhesive layer and a high-temperature-resistant adhesive layer, wherein the ultraviolet blocking layer is connected with the PA layer through the adhesive layer, and the PA layer is connected with the EVOH co-extrusion layer through the high-temperature-resistant adhesive layer.
In specific implementation, the composite film can sequentially comprise a QUVPET ultraviolet blocking layer, an adhesive layer, a PA layer, a high-temperature-resistant adhesive layer and an EVOH co-extrusion layer from outside to inside.
This example also provides information on the detection of the composite film, which is measured to have a width of 451mm, a thickness of 101.4UM, a tensile strength MD of 45.89MPa, a tensile strength TD of 40.08MPa, an elongation at break MD of 547.5MPa, an elongation at break TD of 563MPa, a heat-seal strength of 40.73N/15mm, a light transmittance of 91.3%, a haze of 20.1%, a friction coefficient C.O.FUS of 0.492in/in, UK of 0.478in/in, US of 0.136out/out, UK of 0.107out/out, and a water vapor transmission WTR of 2.77 g/m/out 2 *24h, oxygen transmission OTR of 0.92cc/m 2 * And the surface wetting tension is 40Dyn/cm after 24 hours.
The composite film provided by the embodiment of the specification can effectively isolate ultraviolet rays by adopting the ultraviolet ray blocking layer, also effectively solves the flexibility of the composite film by adopting the PA layer, so that the composite film is not easy to damage, and further adopts the EVOH co-extrusion layer to realize the technical effects of high water vapor and oxygen blocking performance and grease resistance of the composite film.
Another embodiment is provided herein, and referring to fig. 2, fig. 2 shows a block diagram of a packaging bag provided according to an embodiment herein.
In the field of food packaging, for example, in the packaging of sauces (sesame paste/peanut butter), sesame paste/peanut butter 0 is not added with a stabilizer of "hydrogenated vegetable oil", is easily oxidized and deteriorated under the influence of light, is limited by a glass package and an aluminum film package, is inconvenient for customers to see contents and cannot see contents when customers use the same, and is difficult to be both. In order to enable the '0 added sesame paste/peanut butter' to be contained in the transparent bag, the transparent bag is convenient to use and the contents can be seen visually. Makes great breakthrough on the composite structure and performance of the packing material, and finally achieves good effects on oxygen permeability, water permeability and ultraviolet ray prevention.
A first embodiment of the present specification provides a package, which in practical use comprises a package body 4 shown in fig. 2. The packaging bag body 4 is made of the composite film provided in the above embodiments.
The composite film solves the technical problem of ultraviolet oxidation of contents in the packaging bag by using the ultraviolet ray barrier film, prolongs the freshness of the product and ensures that the fragrance of the product is more durable; the flexibility of the product is improved by compounding multiple layers of PA layers, the design of 11 layers of symmetrical structures is adopted, and the PA layers are added at the later stage, so that the problem that the stiffness and the flexibility of the traditional three-layer structure cannot coexist is effectively solved, the deep tensile property is realized, the flexibility is good, the cracking cannot be generated by repeatedly kneading, and the problems of package breaking and sauce leakage in the transportation of the bagged sauce package and the like can be effectively solved; through the characteristics of the EVOH film, the EVOH film has high water vapor and oxygen barrier property, is grease-resistant, and effectively ensures the shelf life of food containing the EVOH film.
In order to facilitate customers to see the contents packaged by the packaging bag, a transparent window opening part can be arranged in the packaging bag body, so that the customers can clearly see the contents from the transparent window opening part, and the visibility requirements of the customers are met; in this regard, a second embodiment of the present specification provides a package comprising: a packaging bag body 4 and a transparent window 5.
Wherein, transparent windowing 5 sets up the lower part of wrapping bag body, and transparent windowing's area accounts for wrapping bag body is less than half.
In a specific implementation, the packaging bag is made of the composite film in the above embodiments, and the material of the composite film is not described in detail in this embodiment, and reference may be made to the material of the composite film in the above embodiments. The transparent window can be arranged at the lower part of the packaging bag body, of course, according to different customer requirements, the transparent window can also be arranged at the middle part or the upper part of the packaging bag body, and the position of the transparent window is not specifically limited in the embodiment; in the embodiment, the transparent window is arranged at the lower part of the packaging bag body as an example, and the transparent window is explained in detail, so that in practical application, the transparent window is arranged at the lower part of the packaging bag body, and the problems of whether the sauce is deposited in the packaging bag, whether the sauce is coagulated and the like can be clearly seen.
Further, the area occupied by the transparent window in the packaging bag may be smaller than one half of the packaging bag body, it should be noted that the area of the transparent window is not limited in this embodiment, and the embodiment takes the example that the area of the transparent window is smaller than one half of the packaging bag body as an example.
The ultraviolet ray blocking film is still arranged at the transparent windowing part, so that the technical problem of ultraviolet ray oxidation of the contents after the packaging bag is windowed is solved.
The wrapping bag that this specification embodiment provided, through the area that the transparent windowing that will set up accounts for the wrapping bag body is less than half, can realize high gas tightness, high temperature resistant, low temperature resistant, the barrier nature is good, the characteristics of separation ultraviolet ray oxidation to the sauce material, reserves transparent window through the printed pattern and can also satisfy consumer's aesthetic and to the visual demand of content.
In order to facilitate customers to conveniently and cleanly obtain the contents in the packaging bag, a suction nozzle device can be arranged in the packaging bag body; specifically, a third embodiment of the present specification provides a packaging bag, including: a package bag body 4 and a suction nozzle 6.
The suction nozzle 6 is provided at the upper portion of the packing bag body.
In a specific implementation, the packaging bag is made of the composite film in the above embodiments, and the material of the composite film is not described in detail in this embodiment, and reference may be made to the material of the composite film in the above embodiments. It should be noted that the suction nozzle is disposed at a specific position of the packaging bag body, which is not limited in this embodiment, and may be disposed at an upper portion of the packaging bag body, or may be disposed at a lower portion of the packaging bag body, and the suction nozzle may be disposed at a position according to a use habit of a customer based on an actual application requirement.
This specification embodiment, through set up the suction nozzle in the wrapping bag body, the content in the wrapping bag is acquireed repeatedly to this suction nozzle of customer's accessible, can guarantee the convenience of customer's operation, also can prevent because of the oxidation problem that obtains the content repeatedly and lead to through the suction nozzle separation air.
In this regard, a fourth embodiment of the present specification provides a package, comprising: a packaging bag body 4, a transparent window 5 and a suction nozzle 6.
In specific implementation, the packaging bag body of the packaging bag is made of the composite film in the above embodiment, wherein the material of the composite film is not described in the embodiment; the specific position and the implementation effect of the transparent window in the packaging bag are not described in detail in this embodiment, and reference may be made to the description in the above embodiments; the specific position and the implementation effect of the suction nozzle in the packaging bag are not described in detail in this embodiment, and reference may be made to the description in the above embodiments.
According to the packaging bag provided by the embodiment of the specification, the composite film is adopted to manufacture the packaging bag body, so that the freshness of a product can be prolonged, the fragrance of the product is more durable, the quality guarantee period of a content food can be guaranteed, the packaging bag body has deep tensile property and good flexibility, cracking can not be generated by repeatedly kneading, and the problems that the packaging bag is broken in the transportation of the bagged sauce, the sauce leaks and the like are effectively solved; the consumer can visually see the contents by printing patterns on the packaging bag body and reserving a transparent window; through set up the suction nozzle on wrapping bag body, can prevent to obtain the problem that the content is rotten because of the content that the air leads to repeatedly.
Claims (7)
1. A composite membrane, comprising: the composite film comprises an ultraviolet blocking layer, a PA layer and an EVOH co-extrusion layer, wherein the composite film is formed by sequentially compounding the ultraviolet blocking layer, the PA layer and the EVOH co-extrusion layer;
the composite membrane further comprises: the ultraviolet barrier layer is connected with the PA layer through the bonding layer, and the PA layer is connected with the EVOH co-extrusion layer through the high-temperature resistant bonding layer.
2. The composite film of claim 1, the uv-blocking layer being a QUVPET uv-blocking layer.
3. The composite film of claim 1, the co-extruded EVOH layer comprising, in order: PE layer, PA layer, EVOH layer, PE layer, PA layer, PE layer, wherein, the middle of each layer is all connected through TIE bonding resin layer.
4. The composite film according to claim 1, wherein the PA layer is 10-50um thick and the EVOH coextruded layer is 90-120um thick.
5. A package, comprising: a package body made of the composite film according to any one of claims 1 to 4.
6. The package of claim 5, further comprising: the transparent windowing, the transparent windowing sets up the lower part of wrapping bag body, and the area of transparent windowing occupies the wrapping bag body is less than one half.
7. The package of claim 6, further comprising: and the suction nozzle is arranged at the upper part of the packaging bag body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122157133.8U CN217671558U (en) | 2021-09-07 | 2021-09-07 | Composite film and packaging bag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122157133.8U CN217671558U (en) | 2021-09-07 | 2021-09-07 | Composite film and packaging bag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217671558U true CN217671558U (en) | 2022-10-28 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122157133.8U Active CN217671558U (en) | 2021-09-07 | 2021-09-07 | Composite film and packaging bag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217671558U (en) |
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2021
- 2021-09-07 CN CN202122157133.8U patent/CN217671558U/en active Active
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