CN113334883A - PE film capable of resisting high-temperature steaming at 121 ℃ and preparation method thereof - Google Patents
PE film capable of resisting high-temperature steaming at 121 ℃ and preparation method thereof Download PDFInfo
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- CN113334883A CN113334883A CN202110521200.1A CN202110521200A CN113334883A CN 113334883 A CN113334883 A CN 113334883A CN 202110521200 A CN202110521200 A CN 202110521200A CN 113334883 A CN113334883 A CN 113334883A
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- Prior art keywords
- density polyethylene
- layer
- heat
- film
- corona
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- 238000002360 preparation method Methods 0.000 title claims description 4
- 238000010025 steaming Methods 0.000 title abstract description 13
- 239000010410 layer Substances 0.000 claims abstract description 62
- 239000000463 material Substances 0.000 claims abstract description 48
- 239000004698 Polyethylene Substances 0.000 claims abstract description 34
- 230000002902 bimodal effect Effects 0.000 claims abstract description 33
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 33
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 33
- 229920001179 medium density polyethylene Polymers 0.000 claims abstract description 33
- 239000004701 medium-density polyethylene Substances 0.000 claims abstract description 33
- 239000012793 heat-sealing layer Substances 0.000 claims abstract description 26
- 238000010411 cooking Methods 0.000 claims abstract description 11
- 239000000155 melt Substances 0.000 claims description 16
- 239000011229 interlayer Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 3
- 238000001125 extrusion Methods 0.000 claims 1
- 239000002861 polymer material Substances 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 description 11
- 238000004806 packaging method and process Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000005025 cast polypropylene Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000005003 food packaging material Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Laminated Bodies (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention belongs to the technical field of high polymer materials. A PE film capable of resisting high-temperature steaming at 121 ℃ is formed by co-extruding a corona layer, an intermediate layer and a heat-sealing layer; the corona layer material is 20-50 wt% of bimodal metallocene medium density polyethylene and 50-80 wt% of high density polyethylene; the intermediate layer material is bimodal metallocene medium-density polyethylene and/or high-density polyethylene; the material of the heat sealing layer is 50-70 wt% of bimodal metallocene medium density polyethylene and 30-50 wt% of high density polyethylene. The PE film has good mechanical property and high-temperature cooking resistance, and the films have high heat-seal strength before and after cooking.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a PE film capable of resisting high-temperature steaming at 121 ℃ and a preparation method thereof.
Background
In order to improve the circulation cycle and shelf life of food, materials used for food packaging need to have good mechanical properties such as tensile strength, tear resistance, impact resistance and the like, and the packaging materials also need to have high sealing property, barrier property and chemical stability, such as suitability for high-temperature sterilization, low-temperature storage and the like of food. The food packaging material usually adopts a polyester film/aluminum foil/nylon/cast polypropylene film or a polyethylene film [ PET/Al/NY/RCPP or PE ] composite packaging bag. The existing PE film has poor high-low temperature resistance, is easy to soften and deform when being steamed at high temperature, is brittle and cracked when being frozen at low temperature, has low heat sealing strength and poor impact resistance, and the prepared packaging bag has poor sealing property and barrier property, and is easy to crack, thus causing the leakage and deterioration of contents.
Disclosure of Invention
The invention aims to solve the technical problem of providing a PE film capable of resisting high-temperature cooking at 121 ℃, wherein the PE film has good mechanical property and high-temperature cooking resistance, and the film has high heat-seal strength before and after cooking.
The technical scheme of the invention is as follows:
a PE film capable of resisting high-temperature steaming at 121 ℃ is formed by co-extruding a corona layer, an intermediate layer and a heat-sealing layer; the corona layer material is 20-50 wt% of bimodal metallocene medium density polyethylene and 50-80 wt% of high density polyethylene; the intermediate layer material is bimodal metallocene medium-density polyethylene and/or high-density polyethylene; the material of the heat sealing layer is 50-70 wt% of bimodal metallocene medium density polyethylene and 30-50 wt% of high density polyethylene.
Further, the density of the bimodal metallocene medium density polyethylene is 0.931-0.940g/cm3。
Further, the high-density polyethylene has a melt index of 0.7-1g/10min and a density of 0.95-0.965g/cm3。
Further, the mass ratio of the materials of the corona layer, the middle layer and the heat sealing layer is 1-3: 1-4:1-3.
Further, the intermediate layer material is 20-60 wt% of bimodal metallocene medium density polyethylene and 40-80 wt% of high density polyethylene.
Further, the high density polyethylene has a melt index of 0.7 to 1g/10 min.
Respectively adding materials of a corona layer, a middle layer and a heat sealing layer into an extruder for heating and melting, co-extruding the materials of all layers after melting, blowing, cooling and carrying out traction shaping to obtain the PE film.
Further, the melt temperature of the corona layer material is 180-200 ℃.
Further, the melt temperature of the interlayer material is 180-200 ℃.
Further, the melt temperature of the heat seal layer material is 180-200 ℃.
The invention has the following beneficial effects:
the bimodal metallocene medium density polyethylene selected by the invention has good processability, good stress cracking resistance and high mechanical strength; the selected high-density polyethylene has good flexibility, impact resistance, heat sealing performance and longitudinal and transverse mechanical properties. The PE film is formed by co-extruding all layers of materials, has good interlayer adhesion, high stability, good mechanical property and high heat-sealing strength, can resist high and low temperature, is high in heat-sealing strength after being cooked at the high temperature of 121 ℃/30min, and is not easy to break after being frozen at the low temperature. The PE film disclosed by the invention is compounded with PET, Al and NY to prepare a bag, and the prepared packaging bag can resist high-temperature steaming at 121 ℃, is high in heat sealing strength, good in sealing performance, durable and not easy to damage.
Detailed Description
The present invention will be described in detail with reference to examples, which are only preferred embodiments of the present invention and are not intended to limit the present invention.
Example 1
A PE film capable of resisting high-temperature steaming at 121 ℃ is formed by co-extruding a corona layer, an intermediate layer and a heat-sealing layer; the mass ratio of the materials of the corona layer, the middle layer and the heat-sealing layer is 3: 4: 3;
the corona layer material is 50 wt% of bimodal metallocene medium density polyethylene and 50 wt% of high density polyethylene;
the intermediate layer material is 50 wt% of bimodal metallocene medium density polyethylene and 50 wt% of high density polyethylene;
the material of the heat sealing layer is 70 wt% of bimodal metallocene medium density polyethylene and 30 wt% of high density polyethylene;
wherein the bimodal metallocene medium density polyethylene has a density of 0.934g/cm3(ii) a The high density polyethylene has a melt index of 0.85g/10min and a density of 0.961g/cm3。
Example 2
A PE film capable of resisting high-temperature steaming at 121 ℃ is formed by co-extruding a corona layer, an intermediate layer and a heat-sealing layer; the mass ratio of the materials of the corona layer, the middle layer and the heat-sealing layer is 3: 4: 3;
the corona layer material is 20 wt% of bimodal metallocene medium density polyethylene and 80 wt% of high density polyethylene;
the intermediate layer material is 20 wt% of bimodal metallocene medium density polyethylene and 80 wt% of high density polyethylene;
the material of the heat sealing layer is 70 wt% of bimodal metallocene medium density polyethylene and 30 wt% of high density polyethylene;
wherein the bimodal metallocene medium density polyethylene has a density of 0.934g/cm3(ii) a The high density polyethylene has a melt index of 0.85g/10min and a density of 0.961g/cm3。
Example 3
A PE film capable of resisting high-temperature steaming at 121 ℃ is formed by co-extruding a corona layer, an intermediate layer and a heat-sealing layer; the mass ratio of the materials of the corona layer, the middle layer and the heat-sealing layer is 3: 4: 3;
the corona layer material is 20 wt% of bimodal metallocene medium density polyethylene and 80 wt% of high density polyethylene;
the intermediate layer material is 60 wt% of bimodal metallocene medium density polyethylene and 40 wt% of high density polyethylene;
the material of the heat sealing layer is 70 wt% of bimodal metallocene medium density polyethylene and 30 wt% of high density polyethylene;
wherein the bimodal metallocene medium density polyethylene has a density of 0.934g/cm3(ii) a The high density polyethylene has a melt index of 0.85g/10min and a density of 0.961g/cm3。
Comparative example 1
A PE film capable of resisting high-temperature steaming at 121 ℃ is formed by co-extruding a corona layer, an intermediate layer and a heat-sealing layer; the mass ratio of the materials of the corona layer, the middle layer and the heat-sealing layer is 3: 4: 3;
the corona layer material is bimodal metallocene medium density polyethylene;
the intermediate layer material is 50 wt% of bimodal metallocene medium density polyethylene and 50 wt% of high density polyethylene;
the material of the heat sealing layer is bimodal metallocene medium density polyethylene;
wherein the bimodal metallocene medium density polyethylene has a density of 0.934g/cm3(ii) a The high density polyethylene has a melt index of 0.85g/10min and a density of 0.961g/cm3。
Comparative example 2
A PE film capable of resisting high-temperature steaming at 121 ℃ is formed by co-extruding a corona layer, an intermediate layer and a heat-sealing layer; the mass ratio of the materials of the corona layer, the middle layer and the heat-sealing layer is 3: 4: 3;
the material of the corona layer is high-density polyethylene;
the intermediate layer material is 50 wt% of bimodal metallocene medium density polyethylene and 50 wt% of high density polyethylene;
the material of the heat sealing layer is bimodal metallocene medium density polyethylene;
wherein the bimodal metallocene medium density polyethylene has a density of 0.934g/cm3(ii) a The high density polyethylene has a melt index of 0.85g/10min and a density of 0.961g/cm3。
Respectively adding materials of a corona layer, a middle layer and a heat sealing layer into an extruder for heating and melting, wherein the melt temperature of each layer of material is 200 ℃, and co-extruding, blowing, cooling and drawing for shaping the melted layers of material to obtain the PE film.
The properties of the PE films of examples 1-3 and comparative examples 1-3 of the invention that can withstand autoclaving at 121 ℃ were tested, with comparative example 3 being RF-100-006 from ACMOR. The test results are shown in tables 1-2:
TABLE 1
TABLE 2
Therefore, the PE film provided by the invention has good mechanical property and high heat-sealing strength.
The PE film examples 1-3 and the comparative examples 1-3 which can resist high-temperature cooking at 121 ℃ are respectively compounded with the NY film, the aluminum film and the PET film to prepare the packaging bags, the performance of the packaging bags before and after 121 ℃/30min cooking is tested, and the test results are shown in the following table:
therefore, the packaging bag made of the PE film can resist high-temperature steaming at 121 ℃, has good sealing performance, and has higher heat sealing strength before and after steaming.
The PE film capable of resisting high-temperature cooking at 121 ℃ has good mechanical property and high-temperature cooking resistance, and the film has high heat-seal strength before and after cooking.
Claims (10)
1. The PE film capable of resisting high-temperature cooking at 121 ℃ is characterized by being formed by co-extruding a corona layer, an intermediate layer and a heat-sealing layer; the corona layer material is 20-50 wt% of bimodal metallocene medium density polyethylene and 50-80 wt% of high density polyethylene; the intermediate layer material is bimodal metallocene medium-density polyethylene and/or high-density polyethylene; the material of the heat sealing layer is 50-70 wt% of bimodal metallocene medium density polyethylene and 30-50 wt% of high density polyethylene.
2. The PE film according to claim 1, wherein the bimodal metallocene medium density polyethylene has a density of from 0.931 to 0.940g/cm3。
3. The PE film according to claim 1, wherein the high density polyethylene has a melt index of 0.7-1g/10min and a density of 0.95-0.965g/cm3。
4. The PE film according to claim 1, wherein the mass ratio of the materials of the corona layer, the middle layer and the heat sealing layer is 1-3: 1-4:1-3.
5. The PE film according to claim 1, wherein the interlayer material is bimodal metallocene medium density polyethylene 20-60 wt% and high density polyethylene 40-80 wt%.
6. The PE film according to claim 1, wherein the high density polyethylene has a melt index of 0.7-1g/10 min.
7. A preparation method of the PE film as claimed in any one of claims 1 to 6, wherein materials of the corona layer, the intermediate layer and the heat-sealing layer are respectively added into an extruder to be heated and melted, and the melted materials of the layers are subjected to co-extrusion, inflation cooling and traction shaping to obtain the PE film.
8. The method for preparing PE film according to claim 7, wherein the melt temperature of the corona layer material is 180-200 ℃.
9. The method as claimed in claim 7, wherein the melt temperature of the interlayer material is 180-200 ℃.
10. The method for preparing a PE film as recited in claim 7, wherein the melt temperature of the material of the heat seal layer is 180-200 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110521200.1A CN113334883A (en) | 2021-05-13 | 2021-05-13 | PE film capable of resisting high-temperature steaming at 121 ℃ and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110521200.1A CN113334883A (en) | 2021-05-13 | 2021-05-13 | PE film capable of resisting high-temperature steaming at 121 ℃ and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113334883A true CN113334883A (en) | 2021-09-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110521200.1A Pending CN113334883A (en) | 2021-05-13 | 2021-05-13 | PE film capable of resisting high-temperature steaming at 121 ℃ and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113334883A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114379157A (en) * | 2022-01-19 | 2022-04-22 | 广州市瑞高包装工业有限公司 | Composite hose used for food packaging and capable of being cooked at high temperature |
| CN117402421A (en) * | 2023-10-23 | 2024-01-16 | 链行走新材料科技(广州)有限公司 | Temperature-resistant polyolefin material and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107283980A (en) * | 2017-07-05 | 2017-10-24 | 永新股份（黄山）包装有限公司 | A kind of digestion resistant polyethylene film and its production technology |
| CN107351474A (en) * | 2017-07-05 | 2017-11-17 | 永新股份（黄山）包装有限公司 | A kind of simple tension can high speed printing delustring PE films and its production technology |
-
2021
- 2021-05-13 CN CN202110521200.1A patent/CN113334883A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107283980A (en) * | 2017-07-05 | 2017-10-24 | 永新股份（黄山）包装有限公司 | A kind of digestion resistant polyethylene film and its production technology |
| CN107351474A (en) * | 2017-07-05 | 2017-11-17 | 永新股份（黄山）包装有限公司 | A kind of simple tension can high speed printing delustring PE films and its production technology |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114379157A (en) * | 2022-01-19 | 2022-04-22 | 广州市瑞高包装工业有限公司 | Composite hose used for food packaging and capable of being cooked at high temperature |
| CN117402421A (en) * | 2023-10-23 | 2024-01-16 | 链行走新材料科技(广州)有限公司 | Temperature-resistant polyolefin material and application thereof |
| CN117402421B (en) * | 2023-10-23 | 2024-05-31 | 链行走新材料科技(广州)有限公司 | Temperature-resistant polyolefin material and application thereof |
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Application publication date: 20210903 |