CN221090176U - High-barrier composite sheet - Google Patents
High-barrier composite sheet Download PDFInfo
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- CN221090176U CN221090176U CN202320958751.9U CN202320958751U CN221090176U CN 221090176 U CN221090176 U CN 221090176U CN 202320958751 U CN202320958751 U CN 202320958751U CN 221090176 U CN221090176 U CN 221090176U
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- 239000002131 composite material Substances 0.000 title claims abstract description 94
- 239000010410 layer Substances 0.000 claims abstract description 187
- 239000011248 coating agent Substances 0.000 claims abstract description 76
- 238000000576 coating method Methods 0.000 claims abstract description 76
- 230000004888 barrier function Effects 0.000 claims abstract description 73
- 239000003292 glue Substances 0.000 claims abstract description 58
- 238000007639 printing Methods 0.000 claims abstract description 26
- 238000007789 sealing Methods 0.000 claims abstract description 25
- 239000012793 heat-sealing layer Substances 0.000 claims abstract description 10
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 25
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 25
- -1 polyethylene terephthalate Polymers 0.000 claims description 18
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 13
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 13
- 229920000728 polyester Polymers 0.000 claims description 8
- 229920002635 polyurethane Polymers 0.000 claims description 5
- 239000004814 polyurethane Substances 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 14
- 239000001301 oxygen Substances 0.000 abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 13
- 239000005022 packaging material Substances 0.000 abstract description 7
- 239000002994 raw material Substances 0.000 description 11
- 238000012360 testing method Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000004806 packaging method and process Methods 0.000 description 7
- 229920000915 polyvinyl chloride Polymers 0.000 description 7
- 239000004800 polyvinyl chloride Substances 0.000 description 7
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 6
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 description 6
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 239000011229 interlayer Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 239000013557 residual solvent Substances 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 239000004793 Polystyrene Substances 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 229920005669 high impact polystyrene Polymers 0.000 description 3
- 239000004797 high-impact polystyrene Substances 0.000 description 3
- 239000002346 layers by function Substances 0.000 description 3
- 229920002223 polystyrene Polymers 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- 229940079593 drug Drugs 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000003856 thermoforming Methods 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- 239000004278 EU approved seasoning Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013351 cheese Nutrition 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008157 edible vegetable oil Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 235000011194 food seasoning agent Nutrition 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000007666 vacuum forming Methods 0.000 description 1
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- Laminated Bodies (AREA)
Abstract
The utility model relates to a high-barrier composite sheet, which comprises a printing layer, an ink layer, a barrier coating, a first glue layer, a composite layer, a second glue layer, a heat sealing layer and a heat sealing coating which are sequentially laminated. The high-barrier composite sheet provided by the utility model has good barrier property to water vapor and oxygen, good heat sealing effect, recyclability and good sealing effect and easy opening when being used as a packaging material.
Description
Technical Field
The utility model belongs to the technical field of composite sheets, and particularly relates to a high-barrier composite sheet.
Background
The composite sheet is generally formed by compounding a plurality of functional layers through thermoforming, and the prepared composite sheet has attractive appearance and good barrier property and is widely applied to the packaging field of foods (such as cheese, edible oil and seasonings), medicines and cosmetics.
CN213472395U discloses a high barrier polystyrene composite sheet, the high barrier polystyrene composite sheet includes the EVOH barrier layer, one side of EVOH barrier layer bonds there is first tie layer, and the EVOH barrier layer has the second tie layer for one side bonding of first tie layer, first tie layer has first HIPS surface layer for one side bonding of EVOH barrier layer, the second tie layer has the second HIPS surface layer for one side bonding of EVOH barrier layer, the both sides of EVOH barrier layer all outwards extend and are formed with equidistant first extension piece that distributes. The high-barrier polystyrene composite sheet provided by the technical scheme has the characteristics of stable structure and good barrier property and wear resistance.
CN203611513U discloses a high-barrier PVC composite sheet, the high-barrier PVC composite sheet includes a PVC sheet layer, and a side surface of the PVC sheet layer is hot-pressed and compounded with a barrier composite film through an adhesive layer, and the barrier composite film includes two heat-seal layers and an oxygen-blocking layer sandwiched between the two heat-seal layers. The high-barrier PVC composite sheet provided by the technical scheme has good oxygen and water resistance and high bonding strength among layers.
CN111634093a discloses a high-barrier polyvinyl chloride-polyethylene composite sheet, a preparation method and application thereof, wherein the high-barrier polyvinyl chloride-polyethylene composite sheet consists of a polyethylene layer, a first polyacrylamide layer, a polyurethane glue layer, a second polyacrylamide layer and a polyvinyl chloride layer which are sequentially arranged from inside to outside. The high-barrier polyvinyl chloride-polyethylene composite sheet has good barrier property, can be used as a medical packaging material, and ensures the long-term stability of the loaded medicines.
Although the above-mentioned solution can realize the barrier property of the composite sheet to some extent, the composite sheet is required to have the characteristics of good sealing effect and easy opening at the same time when used as a packaging material, and the above-mentioned solution is not mentioned. In addition, the composite sheet is mostly formed by different functional layers, and materials of the different functional layers cannot be recovered together, for example, PVC is a main source of dioxin, HIPS contains benzene rings and cannot be recovered and reused, so that the composite sheet is difficult to recover.
Therefore, there is a need to develop a composite sheet material that has good barrier properties, is recyclable, and is used as a packaging material, while having good sealing effect and easy-to-open characteristics.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model aims to provide a high-barrier composite sheet. The high-barrier composite sheet has the characteristics of good barrier property to water vapor and oxygen, good heat sealing effect and recoverability, and is used as a packaging material and has the characteristics of good sealing effect and easy opening.
In order to achieve the purpose, the utility model adopts the following technical scheme:
The utility model provides a high-barrier composite sheet, which comprises a printing layer, an ink layer, a barrier coating, a first glue layer, a composite layer, a second glue layer, a heat sealing layer and a heat sealing coating which are sequentially laminated.
Preferably, the printed layer is a polyethylene terephthalate (PET) layer.
Preferably, the thickness of the printed layer is 12-30 μm, e.g. 12 μm, 18 μm, 20 μm, 21 μm, 22 μm, 24 μm, 25 μm, 26 μm, 28 μm or 30 μm etc.
According to the utility model, the polyethylene terephthalate layer is selected as the printing layer, so that the requirements of heat resistance and the degree of tensile deformation in the vacuum forming process can be met, and the organic combination of decoration, information transmission and protection functions is realized.
Preferably, the ink layer is a polyurethane ink layer having a thickness of 1-2 μm, for example 1 μm, 1.1 μm, 1.2 μm, 1.3 μm, 1.4 μm, 1.5 μm, 1.6 μm, 1.7 μm, 1.8 μm, 1.9 μm or 2 μm, etc.
Preferably, the barrier coating is a modified polyvinyl alcohol high barrier coating having a thickness of 1-3 μm, such as 1 μm, 1.2 μm, 1.4 μm, 1.6 μm, 1.8 μm, 2 μm, 2.2 μm, 2.4 μm, 2.6 μm, 2.8 μm or 3 μm, etc.
The barrier coating has better oxygen and water resistance, so that the high-barrier composite sheet has high barrier property to oxygen and water vapor. The thickness of the barrier coating is 1-3 mu m, if the thickness is less than 1 mu m, the barrier effect on oxygen and water vapor cannot meet the requirement, and if the thickness of the coating is more than 3 mu m, the cost of the high-barrier composite sheet is increased.
Preferably, the modified polyvinyl alcohol high barrier coating is prepared from modified polyvinyl alcohol.
The modified polyvinyl alcohol is modified polyvinyl alcohol H1909, which is purchased from Shanghai Ruo new material science and technology Co., ltd, and the modified polyvinyl alcohol does not need to be added with solvent in use.
Preferably, the first and second glue layers are solvent-free glue layers each independently having a thickness of 1-3 μm, e.g. 1 μm, 1.2 μm, 1.4 μm, 1.6 μm, 1.8 μm, 2 μm, 2.2 μm, 2.4 μm, 2.6 μm, 2.8 μm or 3 μm etc.
Preferably, the solvent-free glue layer is a polyurethane glue layer.
The solvent-free glue provided by the utility model does not need to be added with a solvent in the use process.
Preferably, the composite layer is a polyethylene terephthalate layer.
Preferably, the thickness of the composite layer is 160-200 μm, e.g. 160 μm, 165 μm, 170 μm, 175 μm, 180 μm, 185 μm, 190 μm, 195 μm or 200 μm etc.
The thickness of the composite layer is preferably 160-200 mu m, if the thickness of the composite layer is more than 200 mu m, the heat conduction effect is reduced, the heat sealing strength of the high-barrier composite sheet is reduced, and if the thickness of the composite layer is less than 160 mu m, the stiffness of the high-barrier composite sheet is reduced.
Preferably, the heat-seal layer is a polyethylene terephthalate layer.
Preferably, the heat-seal layer has a thickness of 12-30 μm, e.g. 12 μm, 14m, 16 μm, 18 μm, 20 μm, 22 μm, 24 μm, 26 μm, 27 μm, 28 μm or 30 μm, etc.
The printing layer, the composite layer and the heat sealing layer are made of the same material and are made of polyethylene terephthalate, so that the proportion of the polyethylene terephthalate in the high-barrier composite sheet is more than 90%, the standard requirement of a single recyclable material is met, and the high-barrier composite sheet has good thermoforming performance.
Preferably, the heat seal coating is a polyester coating having a thickness of 3-5 μm, such as 3 μm, 3.2 μm, 3.5 μm, 3.8 μm, 4 μm, 4.2 μm, 4.5 μm, 4.6 μm, 4.7 μm, 4.8 μm or 5 μm, etc.
According to the utility model, the heat sealing coating is coated on the heat sealing layer by using the dry type compound machine, so that the high-barrier compound sheet has good heat sealing performance, the heat sealing strength can be controlled to be 5-10N/15 mm, and the high-barrier compound sheet has good heat sealing performance and can be ensured to be used as a packaging material to be easy to open.
Preferably, the polyester coating is prepared from a raw material of bosch 1202M.
Illustratively, the method of making the high barrier composite sheet is as follows:
(1) And printing ink on one side of the printing layer to form an ink layer, and coating the raw material of the barrier coating on the ink layer by using a dry type compounding machine to form the barrier coating.
(2) And coating the raw materials of the heat-sealing coating on one side of the heat-sealing layer by using a dry type compounding machine to form the heat-sealing coating.
(3) And coating bonding raw materials on two sides of the composite layer to form a first glue layer and a second glue layer, and sequentially laminating and attaching the printing layer, the printing ink layer, the barrier coating, the first glue layer, the composite layer, the second glue layer, the heat sealing layer and the heat sealing coating to obtain the high-barrier composite sheet.
Compared with the prior art, the utility model has the following beneficial effects:
the high-barrier composite sheet provided by the utility model has the characteristics of good printing appearance, good barrier property to water vapor and oxygen, good heat sealing effect after molding and recoverability through the arrangement of the printing layer, the ink layer, the barrier coating, the first glue layer, the composite layer, the second glue layer, the heat sealing layer and the heat sealing coating. The heat sealing strength is 5-10N/15 mm, the residual solvent is less than 5mg/m 2, the interlayer peeling strength is more than 3N/15mm, the oxygen permeability is as low as less than 1cm 2/m2.24h.1atm, and the water vapor permeability is less than 5g/m 2.24 h. The high-barrier composite sheet material can be used as a packaging material to well block water vapor and oxygen, has a good sealing effect on contents, can improve the quality guarantee period and the fresh-keeping period of the contents, is easy to open in packaging, and has good use experience.
Drawings
FIG. 1 is a schematic structural view of a high barrier composite sheet according to example 1;
Wherein, 1-printing the layer; 2-an ink layer; 3-a barrier coating; 4-a first glue layer; 5-a composite layer; 6-a second glue layer; 7-heat sealing layer; 8-Heat seal coating.
Detailed Description
To facilitate understanding of the present utility model, examples are set forth below. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the utility model and are not to be construed as a specific limitation thereof.
The high barrier composite sheets of the examples and comparative examples were prepared from the following raw materials:
the preparation raw materials of the ink layer: UMT99 in su zhou
Preparation raw materials of the barrier coating: modified polyvinyl alcohol H1909, shanghai Ruo New Material technology Co., ltd
The preparation raw materials of the first solvent-free glue layer are as follows: keyi SF7660/CA7920
The preparation raw materials of the second glue layer: keyi SF735A/CA478
Preparing raw materials of the heat-sealing coating: boshi glue 1202M
Example 1
The embodiment provides a high-barrier composite sheet, as shown in fig. 1, which comprises a printing layer 1, an ink layer 2, a barrier coating 3, a first glue layer 4, a composite layer 5, a second glue layer 6, a heat sealing layer 7 and a heat sealing coating 8 which are sequentially laminated.
Wherein the printing layer 1 is a PET layer with a thickness of 12 μm.
The ink layer 2 had a thickness of 2. Mu.m.
The barrier coating 3 is a modified polyvinyl alcohol coating with a thickness of 1 μm.
The first glue layer 4 is a solvent-free glue layer with a thickness of 2 μm.
The composite layer 5 is a polyethylene terephthalate layer with a thickness of 160 μm.
The second glue layer 6 is a solvent-free glue layer with a thickness of 1.5 μm.
The heat-seal layer 7 was a PET layer having a thickness of 12. Mu.m.
The heat-seal coating 8 is a polyester coating, and the thickness of the heat-seal coating is 3 μm.
Example 2
The embodiment provides a high-barrier composite sheet, including printing layer, printing ink layer, barrier coating, first glue layer, composite layer, second glue layer, heat seal layer and the heat seal coating of range upon range of setting in proper order.
Wherein the printing layer is a PET layer with a thickness of 23 μm.
The ink layer had a thickness of 1.5. Mu.m.
The barrier coating is a modified polyvinyl alcohol coating with a thickness of 3 μm.
The first glue layer was a solvent-free glue layer with a thickness of 1 μm.
The composite layer is a polyethylene terephthalate layer with a thickness of 170 μm.
The second glue layer was a solvent-free glue layer with a thickness of 2 μm.
The heat-seal layer was a PET layer with a thickness of 23. Mu.m.
The heat seal coating is a polyester coating, and the thickness of the heat seal coating is 4 mu m.
Example 3
The embodiment provides a high-barrier composite sheet, including printing layer, printing ink layer, barrier coating, first glue layer, composite layer, second glue layer, heat seal layer and the heat seal coating of range upon range of setting in proper order.
Wherein the printing layer is a PET layer with a thickness of 30 μm.
The ink layer had a thickness of 1. Mu.m.
The barrier coating is a modified polyvinyl alcohol coating with a thickness of 2 μm.
The first glue layer was a solvent-free glue layer with a thickness of 3 μm.
The composite layer is a polyethylene terephthalate layer with a thickness of 200 μm.
The second glue layer was a solvent-free glue layer with a thickness of 1.5 μm.
The heat-seal layer was a PET layer with a thickness of 30. Mu.m.
The heat seal coating is a polyester coating, and the thickness of the heat seal coating is 5 mu m.
Example 4
The embodiment provides a high-barrier composite sheet, including printing layer, printing ink layer, barrier coating, first glue layer, composite layer, second glue layer, heat seal layer and the heat seal coating of range upon range of setting in proper order.
Wherein the printing layer is a PET layer with a thickness of 30 μm.
The ink layer had a thickness of 2. Mu.m.
The barrier coating is a modified polyvinyl alcohol coating with a thickness of 4 μm.
The first glue layer was a solvent-free glue layer with a thickness of 2 μm.
The composite layer is a polyethylene terephthalate layer with a thickness of 210 μm.
The second glue layer was a solvent-free glue layer with a thickness of 1.5 μm.
The heat-seal layer was a PET layer with a thickness of 30. Mu.m.
The heat seal coating is a polyester coating, and the thickness of the heat seal coating is 2 mu m.
Example 5
The embodiment provides a high-barrier composite sheet, including printing layer, printing ink layer, barrier coating, first glue layer, composite layer, second glue layer, heat seal layer and the heat seal coating of range upon range of setting in proper order.
Wherein the printing layer is a PET layer with a thickness of 12 μm.
The ink layer had a thickness of 2. Mu.m.
The barrier coating is a modified polyvinyl alcohol coating with a thickness of 2 μm.
The first glue layer was a solvent-free glue layer with a thickness of 2 μm.
The composite layer is a polyethylene terephthalate layer with a thickness of 150 μm.
The second glue layer was a solvent-free glue layer with a thickness of 1.5 μm.
The heat-seal layer was a PET layer with a thickness of 12. Mu.m.
The heat seal coating is a polyester coating, and the thickness of the heat seal coating is 2 mu m.
Comparative example 1
This comparative example provides a high barrier composite sheet that differs from example 1 in that it does not include a heat seal coating.
Comparative example 2
This comparative example provides a high barrier composite sheet that differs from example 1 in that no barrier coating is included, wherein the ink layer is bonded to the composite layer by a first glue layer.
Performance testing
The high barrier composite sheets provided in the examples and comparative examples were subjected to the following performance tests.
(1) Heat seal strength: the heat seal strength test was performed according to the test method provided by QB/T2358-1998.
(2) Residual solvent: residual solvent testing was performed according to the test method provided in GB/T10004-2008.
(3) Interlayer peel strength: interlayer peel strength was measured in accordance with the specification of GB/T8808-1988.
(4) Oxygen transmission rate: the oxygen transmission rate test was carried out according to the test method provided in GB/T19789-2005 under the test conditions of 23℃and 0% RH.
(5) Water vapor transmission rate: the water vapor transmission rate test was carried out according to the test method provided in GB/T2653-2010, under the test conditions of 38℃and 90% RH.
(6) Formability: preparing the high-barrier composite sheet material into a packaging product through a packaging machine, observing the molding effect of the packaging product, and if the prepared packaging product is perfect in shape and has no collapse, the molding effect is good, otherwise, the packaging product cannot be molded; the packaged product was subjected to a water passing test to see if there was a leak.
The test results are shown in Table 1.
TABLE 1
As shown by the test results in Table 1, the heat sealing strength of the high-barrier composite sheet provided in examples 1-3 is 5-10N/15 mm, the residual solvent is less than 5mg/m 2, the interlayer peeling strength is more than 3N/15mm, the oxygen permeability is as low as less than 1cm 2/m2.24h.1 atm, the water vapor permeability is less than 5g/m 2.24 h, and the thickness of the barrier coating has a great influence on the barrier property of the high-barrier composite sheet, especially the oxygen permeability. The high barrier composite sheet provided in example 4 had a decrease in heat seal strength due to an excessively high thickness of the composite layer, resulting in leakage in the package bag prepared by heat sealing the high barrier composite sheet. The high barrier composite sheet provided in example 5 had a lower thickness of the composite layer, which affected the overall molding effect and did not achieve the desired moldability.
In contrast to example 1, the high barrier composite sheet could not be heat sealed without the heat seal coating (comparative example 1).
The barrier properties of the high barrier composite sheet, particularly the oxygen barrier properties, were reduced without the barrier coating (comparative example 2) compared to example 1.
The applicant states that the present utility model is illustrated by the above examples as a high barrier composite sheet of the present utility model, but the present utility model is not limited to the above detailed methods, i.e. it is not meant that the present utility model must rely on the above detailed methods to be practiced. It should be apparent to those skilled in the art that any modification of the present utility model, equivalent substitution of raw materials for the product of the present utility model, addition of auxiliary components, selection of specific modes, etc., falls within the scope of the present utility model and the scope of disclosure.
Claims (10)
1. The high-barrier composite sheet is characterized by comprising a printing layer, an ink layer, a barrier coating, a first glue layer, a composite layer, a second glue layer, a heat sealing layer and a heat sealing coating which are sequentially laminated.
2. The high barrier composite sheet of claim 1, wherein the printed layer is a polyethylene terephthalate layer.
3. The high barrier composite sheet of claim 1, wherein the printed layer has a thickness of 12-30 μιη.
4. The high barrier composite sheet of claim 1, wherein the ink layer is a polyurethane ink layer having a thickness of 1-2 μm.
5. The high barrier composite sheet of claim 1, wherein the barrier coating is a modified polyvinyl alcohol high barrier coating having a thickness of 1-3 μm.
6. The high barrier composite sheet of claim 1, wherein the first and second glue layers are solvent-free glue layers, each independently 1-3 μιη thick;
the solvent-free glue layer is a polyurethane glue layer.
7. The high barrier composite sheet of claim 1, wherein the composite layer is a polyethylene terephthalate layer.
8. The high barrier composite sheet of claim 1, wherein the composite layer has a thickness of 160-200 μιη.
9. The high barrier composite sheet of claim 1, wherein the heat seal layer is a polyethylene terephthalate layer, the heat seal layer having a thickness of 12-30 μιη.
10. The high barrier composite sheet of claim 1, wherein the heat seal coating is a polyester coating and the heat seal coating has a thickness of 3-5 μιη.
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| CN202320958751.9U CN221090176U (en) | 2023-04-25 | 2023-04-25 | High-barrier composite sheet |
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| CN202320958751.9U CN221090176U (en) | 2023-04-25 | 2023-04-25 | High-barrier composite sheet |
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