CN220864948U - Packaging film for liquid food - Google Patents
Packaging film for liquid food Download PDFInfo
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- CN220864948U CN220864948U CN202320467215.9U CN202320467215U CN220864948U CN 220864948 U CN220864948 U CN 220864948U CN 202320467215 U CN202320467215 U CN 202320467215U CN 220864948 U CN220864948 U CN 220864948U
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- 239000012785 packaging film Substances 0.000 title claims abstract description 39
- 229920006280 packaging film Polymers 0.000 title claims abstract description 39
- 235000021056 liquid food Nutrition 0.000 title claims abstract description 34
- 239000010410 layer Substances 0.000 claims abstract description 214
- 230000004888 barrier function Effects 0.000 claims abstract description 38
- 239000002344 surface layer Substances 0.000 claims abstract description 33
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims abstract description 29
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000004715 ethylene vinyl alcohol Substances 0.000 claims abstract description 29
- 239000012792 core layer Substances 0.000 claims abstract description 28
- 238000001125 extrusion Methods 0.000 claims abstract description 24
- 229920001903 high density polyethylene Polymers 0.000 claims description 29
- 239000004700 high-density polyethylene Substances 0.000 claims description 29
- 229920001684 low density polyethylene Polymers 0.000 claims description 19
- 239000004702 low-density polyethylene Substances 0.000 claims description 16
- 239000012790 adhesive layer Substances 0.000 claims description 8
- 238000004806 packaging method and process Methods 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 3
- 229920001526 metallocene linear low density polyethylene Polymers 0.000 description 43
- 238000012360 testing method Methods 0.000 description 19
- 239000004698 Polyethylene Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000004712 Metallocene polyethylene (PE-MC) Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 235000020095 red wine Nutrition 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
- Wrappers (AREA)
Abstract
The utility model discloses a packaging film for liquid food, which is a multilayer co-extrusion film, wherein the co-extrusion film comprises a first surface layer, a barrier core layer and a second surface layer, the barrier core layer comprises an EVOH layer, the first surface layer and the second surface layer comprise a first puncture-resistant layer and a second puncture-resistant layer from the surface to the inside, and the layer thickness of the first puncture-resistant layer is greater than or equal to the layer thickness of the second puncture-resistant layer. The packaging film for liquid food has reasonable structure, and the barrier property of the co-extrusion film is improved by adjusting the layer thickness of the EVOH layer; the first surface layer and the second surface layer on the two surfaces of the barrier core layer respectively comprise a first puncture-resistant layer and a second puncture-resistant layer from the surface to the inside, the second puncture-resistant layer and the first puncture-resistant layer act cooperatively, the physical and mechanical properties of the large packaging bag manufactured by the co-extrusion film are improved, and the liquid food is prevented from being broken by external force in the storage and transportation processes.
Description
Technical Field
The utility model relates to the technical field of composite films, in particular to a packaging film for liquid foods.
Background
With the newer development of packaging materials, packaging films are increasingly used in packaging and transportation of products. However, the existing packaging film has single structure and function, only plays a certain role in protection, and especially in the field of liquid packaging and transportation, the existing packaging film is extruded and impacted by forces in all directions in the production or transportation process, and the liquid packaging film has the defects of poor bearing capacity, high bag breaking rate and the like.
Patent CN211055778U discloses a high impact PE film for a liquid packaging bag, which comprises a surface layer, a bottom layer and a middle layer, wherein the surface layer and the bottom layer are made of metallocene polyethylene materials, and the middle layer is made of polyethylene materials with a melting value of 0.25. This scheme improves elasticity through the intermediate level of ripple form structure, and easy tensile, and then prevent that the wrapping bag from propping open when receiving the extrusion. Although the polyethylene with low melting value has good physical and mechanical properties, the processability is poor, and the actual processing into the corrugated film is difficult to operate; the packaging film is processed into a large packaging bag with the bag length of more than 3m and the bag width of more than 2m, and is used for long-term storage of liquid foods such as water, oil, red wine and the like, and the barrier property and the mechanical strength of the packaging bag are still insufficient.
Patent CN208484317U discloses a high-barrier bag for food, which is made by heat-sealing and splicing high-barrier films for food, wherein the high-barrier film for food is at least seven layers of symmetrical co-extrusion films, and comprises a middle barrier layer, two sides of the middle barrier layer are respectively provided with at least two PE layers, and the middle barrier layer is adhered with the at least two PE layers through an adhesive layer; the intermediate barrier layer has a structure of single layer of EVOH or packaging film for liquid food of P/packaging film for liquid food of EVOH/P. Although the scheme improves the barrier property, the physical and mechanical properties are still not good, and the large packaging bag is easy to damage when being extruded.
Therefore, there is a need for improvements in the packaging films for liquid foods in the prior art.
Disclosure of utility model
One of the purposes of the utility model is to overcome the defects in the prior art, and provide a packaging film for liquid food, wherein the barrier property of the co-extrusion film is improved by an EVOH layer and adjusting the layer thickness of the EVOH layer; the first surface layer and the second surface layer on the two surfaces of the barrier core layer respectively comprise a first puncture-resistant layer and a second puncture-resistant layer from the surface to the inside, and the second puncture-resistant layer and the first puncture-resistant layer cooperate to improve the physical and mechanical properties of the co-extrusion film to prepare the large packaging bag.
In order to achieve the technical effects, the technical scheme of the utility model is as follows: the utility model provides a packaging film for liquid food, is multilayer crowded membrane altogether, crowded membrane altogether includes first surface course, separation sandwich layer and second surface course, the separation sandwich layer includes the EVOH layer, first surface course and second surface course all include first anti-puncture layer and second anti-puncture layer from the surface to the interior, the layer thickness of first anti-puncture layer is greater than or equal to the layer thickness of second anti-puncture layer.
The first surface layer and/or the second surface layer further comprises a third puncture-resistant layer, and the third puncture-resistant layer is clamped between the barrier core layer and the second puncture-resistant layer or is clamped between the first puncture-resistant layer and the second puncture-resistant layer.
The preferred technical scheme is that the third puncture resistant layer is a first metallocene low density polyethylene layer or a high density polyethylene layer.
The thickness of the third puncture resistant layer is smaller than or equal to the thickness of the first puncture resistant layer.
The preferred technical scheme is that the first puncture resistant layer and the second puncture resistant layer are both second metallocene low-density polyethylene layers.
The preferable technical proposal is that the layer thickness of the barrier core layer accounts for 12-20% of the total film thickness of the co-extrusion film.
The preferred technical scheme is that the first surface layer is connected with the barrier core layer, and the barrier core layer is connected with the second surface layer through an adhesive layer.
The preferable technical scheme is that the layer thicknesses of the first surface layer and the second surface layer are 33-39% of the total film thickness of the co-extrusion film.
The second object of the present utility model is to overcome the drawbacks of the prior art and to provide a packaging bag for liquid food, which is produced by heat-sealing the above packaging film for liquid food.
The utility model has the advantages and beneficial effects that:
The packaging film for liquid food has reasonable structure, and the barrier property of the co-extrusion film is improved by adjusting the layer thickness of the EVOH layer; the first surface layer and the second surface layer on the two surfaces of the barrier core layer respectively comprise a first puncture-resistant layer and a second puncture-resistant layer from the surface to the inside, the second puncture-resistant layer has a buffer effect on the first puncture-resistant layer of the surface layer in terms of impact resistance, and the physical and mechanical properties of the large packaging bag prepared by the co-extrusion film are improved by the co-extrusion film, so that the liquid food is prevented from being broken by external force in the storage and transportation processes; the thickness of the first puncture-resistant layer is larger than or equal to that of the second puncture-resistant layer, so that the flatness and stability of the co-extruded film are improved, and the impact resistance, puncture resistance and other mechanical properties of the co-extruded film are improved.
Drawings
FIG. 1 is a schematic view showing the structure of an embodiment 1 of a packaging film for liquid foods according to the present utility model;
FIG. 2 is a schematic structural view of example 2 of a packaging film for liquid foods of the present utility model;
FIG. 3 is a schematic view showing the structure of example 3 of the packaging film for liquid foods of the present utility model;
FIG. 4 is a schematic structural view of example 4 of the packaging film for liquid foods of the present utility model;
FIG. 5 is a schematic view showing the structure of example 5 of a packaging film for liquid foods according to the present utility model.
In the figure: 1. a barrier core layer; 2-a, a first facing; 2-b, a second facing; 3. an adhesive layer; 10. an EVOH layer; 11. a PA layer; 21. a first puncture resistant layer; 22. a second puncture resistant layer; 23. a third puncture resistant layer; 231. a high density polyethylene layer; 232. a first metallocene low density polyethylene layer.
Detailed Description
The following describes the embodiments of the present utility model further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model.
The terms "first," "second," and the like 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 defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature.
As shown in fig. 1 to 5, the packaging film for liquid food is a multilayer co-extruded film, the co-extruded film comprises a first surface layer 2-a, a barrier core layer 1 and a second surface layer 2-b, the barrier core layer 1 comprises an EVOH layer 10, the first surface layer 2-a and the second surface layer 2-b each comprise a first puncture-resistant layer 21 and a second puncture-resistant layer 22 from the surface to the inside, and the layer thickness of the first puncture-resistant layer 21 is larger than the layer thickness of the second puncture-resistant layer 22. The first surface layer 2-a is connected with the barrier core layer 1, and the barrier core layer 1 and the second surface layer 2-b through the adhesive layer 3. The thickness of the co-extruded film may be adjusted according to the use scenario, and preferably the thickness of the co-extruded film is 30 to 200 μm. The packaging film can be seven layers of co-extrusion films, nine layers of co-extrusion films and eleven layers of co-extrusion films. The production benefit, performance and quality indexes of the packaging film are integrated under the limitation of the self factors of the equipment, and preferably, the packaging film is nine layers of co-extrusion films.
The barrier core layer 1 is a single layer of EVOH or a laminated structure of EVOH/PA. The first puncture resistant layer 21 and the second puncture resistant layer 22 are both second metallocene low density polyethylene layers. The metallocene polyethylene has the advantages of low heat sealing temperature, high heat sealing strength, good toughness, excellent stretching and impact strength and the like, and the film can be thinned, so that the cost of raw materials, processing and transportation is reduced. The constituent raw materials of first puncture resistant layer 21 comprise one type of metallocene low density polyethylene or two different types of metallocene low density polyethylenes, preferably one or more combinations of the types of metallocene low density polyethylenes of first puncture resistant layer 21, exxon 1018MF and Tao Shidu Pont 5400G. The constituent materials of the second puncture resistant layer 22 comprise one type of metallocene low density polyethylene or two different types of metallocene low density polyethylene, preferably the metallocene low density polyethylene of the second puncture resistant layer 22 is Tao Shidu bang 5400G, or a combination of the two types of the metallocene low density polyethylenes 1018MF and Tao Shidu bang 5400G.
As shown in fig. 1-2, the first 2-a and second 2-b facing layers each include a third puncture resistant layer 23, the third puncture resistant layer 23 being sandwiched between the barrier core layer 1 and the second puncture resistant layer 22, the third puncture resistant layer 23 being either a first metallocene low density polyethylene layer 232 or a high density polyethylene layer 231. Preferably, the coextruded film has a layer structure of mLLDPE/mLLDPE/HDPE/tie/EVOH/tie/mLLDPE/mLLDPE, or is
MLLDPE/mLLDPE/HDPE/tie/EVOH/tie/HDPE/mLLDPE/mLLDPE. Wherein, the high-density polyethylene has excellent impact resistance, and cooperates with the first puncture-resistant layer 21 and the second puncture-resistant layer 22 to further improve the mechanical strength of the co-extrusion film, thereby being suitable for the production of large-scale packaging bags for packaging liquid foods; the high-density polyethylene has strong corrosion resistance and strong resistance to inorganic acid, organic acid, inorganic salt, aldehydes, alcohols, grease, esters and other substances, and is suitable for storing liquid foods such as water, oil, red wine and the like; and the high density polyethylene layer 231 cooperates with the EVOH layer 10 to further improve the barrier properties of the coextruded film. Preferably, the high-density polyethylene layer 231 is formed from Thailand PTT as HD3355F.
As shown in fig. 3 to 4, each of the first and second facing layers 2-a and 2-b includes a third puncture resistant layer 23, the third puncture resistant layer 23 being sandwiched between the first and second puncture resistant layers 21 and 22, the third puncture resistant layer 23 being a first metallocene low density polyethylene layer 232 or a high density polyethylene layer 231. Preferably, the layer structure of the coextruded film is mLLDPE/HDPE/mLLDPE
The composition is/tie/EVOH/tie/mLLDPE/mLLDPE/mLLDPE or mLLDPE/HDPE/mLLDPE/tie/EVOH/tie/mLLDPE/HDPE/mLLDPE.
Wherein, the thickness of the third anti-puncture layer 23 is smaller than that of the first anti-puncture layer 21, and the thickness of the thin layer is reduced on the premise of ensuring the quality of the co-extrusion film, which is beneficial to controlling the production cost; and on the premise that the total film thickness of the co-extrusion film is unchanged, the layer thickness of the third anti-puncture layer 23 is thinned, the layer thickness of the first anti-puncture layer 21 is increased, the mechanical properties of the co-extrusion film such as impact resistance, puncture resistance and the like can be improved, and the obtained co-extrusion film is better in flatness and stability.
Under the condition that the total layer thickness of the surface layer is unchanged, compared with mLLDPE/HDPE
The laminated structure of/mLLDPE and the laminated structure of HDPE/mLLDPE/mLLDPE have better toughness and better mechanical properties of impact resistance and puncture resistance, but lower air resistance, water resistance and corrosion resistance.
As shown in fig. 5, the first surface layer 2-a includes a third puncture-resistant layer 23, the third puncture-resistant layer 23 is sandwiched between the barrier core layer 1 and the second puncture-resistant layer 22, the third puncture-resistant layer 23 is a high-density polyethylene layer 231, and the barrier core layer 1 is a laminated structure of EVOH/PA. The gas-blocking, water-blocking and corrosion-resistant properties of the co-extrusion film are obviously improved.
The packaging bag for liquid food is prepared by heat-sealing the packaging film for liquid food.
Example 1
As shown in FIG. 1, the first and second puncture-resistant layers 21 and 22 are both second metallocene LDPE layers, the barrier core layer 1 is a single EVOH layer, the first and second facing layers 2-a and 2-b each include a third puncture-resistant layer 23, the third puncture-resistant layer 23 is sandwiched between the barrier core layer 1 and the second puncture-resistant layer 22, the third puncture-resistant layer 23 of the first facing layer 2-a is a LDPE layer 231, the third puncture-resistant layer 23 of the second facing layer 2-b is a LDPE layer 232, i.e., the co-extruded film has a layer structure of
MLLDPE/mLLDPE/HDPE/tie/EVOH/tie/mLLDPE/mLLDPE/mLLDPE. The total film thickness of the coextruded film was 100. Mu.m, the layer thickness of the first puncture resistant layer 21 was 15. Mu.m, the layer thickness of the second puncture resistant layer 22 was 14. Mu.m, the layer thickness of the third puncture resistant layer 23 was 7. Mu.m, the EVOH layer was 14. Mu.m, and the adhesive layer 3 was 7. Mu.m.
Example 2
As shown in FIG. 2, example 2 is based on example 1, except that the third puncture resistant layer 23 of the first and second facing layers 2-a and 2-b are both high density polyethylene layers 231, and the layer structure of the coextruded film is mLLDPE/mLLDPE/HDPE/tie/EVOH/tie/HDPE
/mLLDPE/mLLDPE。
Example 3
As shown in fig. 3, the first facing layer 2-a and the second facing layer 2-b each include a third puncture resistant layer 23, the third puncture resistant layer 23 is sandwiched between the first puncture resistant layer 21 and the second puncture resistant layer 22, the third puncture resistant layer 23 of the first facing layer 2-a is a high density polyethylene layer 231, and the third puncture resistant layer 23 of the second facing layer 2-b is a first metallocene low density polyethylene layer 232. Namely the layer structure of the coextrusion film is mLLDPE/HDPE/mLLDPE/tie/EVOH/tie +.
MLLDPE/mLLDPE/mLLDPE. The total film thickness of the coextruded film was 100. Mu.m, the layer thickness of the first puncture resistant layer 21 was 15. Mu.m, the layer thickness of the second puncture resistant layer 22 was 7. Mu.m, the layer thickness of the third puncture resistant layer 23 was 14. Mu.m, the EVOH layer 10 was 14. Mu.m, and the adhesive layer 3 was 7. Mu.m.
Example 4
As shown in FIG. 4, example 4 is based on example 3, except that the third puncture resistant layer 23 of the first and second facing layers 2-a and 2-b are both high density polyethylene layers 231, i.e. the layer structure of the coextruded film is mLLDPE/HDPE/mLLDPE/tie/EVOH/tie/mLLDPE/HDPE
/mLLDPE。
Example 5
As shown in fig. 5, the first surface layer 2-a includes a third puncture-resistant layer 23, the third puncture-resistant layer 23 is sandwiched between the barrier core layer 1 and the second puncture-resistant layer 22, the third puncture-resistant layer 23 is a high density polyethylene layer 231, and the barrier core layer 1 is a laminated structure of an EVOH layer 10 and a PA layer 11. I.e. the layer structure of the coextruded film is mLLDPE/mLLDPE/HDPE/tie/EVOH/PA/tie
/MLLDPE/mLLDPE. The total film thickness of the coextruded film was 100. Mu.m, the layer thickness of the first puncture resistant layer 21 was 15. Mu.m, the layer thickness of the second puncture resistant layer 22 was 14. Mu.m, the layer thickness of the third puncture resistant layer 23 was 7. Mu.m, the EVOH layer 10 was 14. Mu.m, the PA layer 11 was 7. Mu.m, and the adhesive layer 3 was 7. Mu.m.
Performance test of packaging film:
1. Heat seal strength measurement: according to test standard QB/T2358-1998;
2. Dart impact test: the packaging film of the example was tested according to test standard GBT9639.1-2008, free dart method, wherein 5.6 dart was selected from method B of 5.6.2; qualified when the dart impact damage quality is more than or equal to 900; otherwise, the test result is unqualified.
3. Puncture resistance: according to the detection standard GB/T10004-2008; the packaging film prepared in the example was subjected to a normal temperature puncture strength test and a low temperature puncture strength test using a needle of 2.5 mm. Test temperature: normal temperature test means that the test temperature is 25 ℃; the low temperature test means that the test temperature is-38 ℃;
When the puncture strength is more than 12N/15mm in normal temperature test, the puncture strength is qualified; otherwise, the test result is unqualified;
when the puncture strength is more than 10N/15mm in the low-temperature test, the puncture strength is qualified; otherwise, the test result is unqualified.
4. Tensile strength measurement: according to the test standard GB/T1040.3-2006; when the longitudinal tensile strength is more than or equal to 45MPa; the transverse tensile strength is more than or equal to 45MPa, and the product is qualified; otherwise, the test result is unqualified.
5. Elongation at break measurement: according to the test standard GB/T1040.3-2006; when the longitudinal elongation at break is more than or equal to 400 percent; the transverse elongation at break is more than or equal to 400 percent, and the product is qualified; otherwise, the test result is unqualified.
6. Oxygen transmission amount: according to the detection standard GB/T1038-2000; when the oxygen transmittance is less than or equal to 1g/m 2. Day, the product is qualified; otherwise, the test result is unqualified.
The performance test results of the packaging films of examples 1 to 5 are as follows:
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.
Claims (8)
1. The packaging film for liquid food is a multilayer co-extrusion film, and comprises a first surface layer (2-a), a barrier core layer (1) and a second surface layer (2-b), and is characterized in that the barrier core layer (1) comprises an EVOH layer (10), the first surface layer (2-a) and the second surface layer (2-b) comprise a first puncture resistant layer (21) and a second puncture resistant layer (22) from the surface to the inside, and the layer thickness of the first puncture resistant layer (21) is larger than or equal to the layer thickness of the second puncture resistant layer (22).
2. Packaging film for liquid food according to claim 1, characterized in that the first (2-a) and/or second (2-b) facing layer further comprises a third puncture resistant layer (23), which third puncture resistant layer (23) is sandwiched between the barrier core layer (1) and the second puncture resistant layer (22) or between the first puncture resistant layer (21) and the second puncture resistant layer (22).
3. Packaging film for liquid food according to claim 2, characterized in that the third puncture resistant layer (23) is a first metallocene low-density polyethylene layer (232) or a high-density polyethylene layer (231).
4. A packaging film for liquid food according to claim 2 or 3, characterized in that the layer thickness of the third puncture resistant layer (23) is equal to or less than the layer thickness of the first puncture resistant layer (21).
5. A packaging film for liquid food according to claim 3, characterized in that the first puncture resistant layer (21) and the second puncture resistant layer (22) are both second metallocene low density polyethylene layers.
6. The packaging film for liquid foods according to claim 1, characterized in that the layer thickness of the barrier core layer (1) is 12-20% of the total film thickness of the co-extruded film.
7. Packaging film for liquid food according to claim 1, characterized in that the first facing layer (2-a) and the barrier core layer (1), the barrier core layer (1) and the second facing layer (2-b) are connected by means of an adhesive layer (3).
8. The packaging film for liquid foods according to claim 1, wherein the layer thicknesses of the first and second surface layers (2-a, 2-b) each account for 33 to 39% of the total film thickness of the co-extruded film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320467215.9U CN220864948U (en) | 2023-03-13 | 2023-03-13 | Packaging film for liquid food |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320467215.9U CN220864948U (en) | 2023-03-13 | 2023-03-13 | Packaging film for liquid food |
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| Publication Number | Publication Date |
|---|---|
| CN220864948U true CN220864948U (en) | 2024-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320467215.9U Active CN220864948U (en) | 2023-03-13 | 2023-03-13 | Packaging film for liquid food |
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| Country | Link |
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