CN113427871A - Easily-torn film material capable of resisting high-temperature cooking and preparation method thereof - Google Patents
Easily-torn film material capable of resisting high-temperature cooking and preparation method thereof Download PDFInfo
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- CN113427871A CN113427871A CN202110521209.2A CN202110521209A CN113427871A CN 113427871 A CN113427871 A CN 113427871A CN 202110521209 A CN202110521209 A CN 202110521209A CN 113427871 A CN113427871 A CN 113427871A
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- density polyethylene
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- heat
- film material
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- 239000000463 material Substances 0.000 title claims abstract description 86
- 238000010411 cooking Methods 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims description 5
- 239000010410 layer Substances 0.000 claims abstract description 76
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 48
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 48
- 239000004743 Polypropylene Substances 0.000 claims abstract description 30
- 229920001155 polypropylene Polymers 0.000 claims abstract description 30
- -1 polypropylene Polymers 0.000 claims abstract description 28
- 239000012793 heat-sealing layer Substances 0.000 claims abstract description 23
- 229920001179 medium density polyethylene Polymers 0.000 claims abstract description 13
- 239000004701 medium-density polyethylene Substances 0.000 claims abstract description 13
- 229920001748 polybutylene Polymers 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 239000000155 melt Substances 0.000 claims description 16
- 239000004698 Polyethylene Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 3
- 238000003851 corona treatment Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract description 19
- 238000010025 steaming Methods 0.000 abstract description 8
- 238000004806 packaging method and process Methods 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 abstract description 3
- 239000002861 polymer material Substances 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 239000002537 cosmetic Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000005022 packaging material Substances 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
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Laminated Bodies (AREA)
- Wrappers (AREA)
Abstract
The invention belongs to the technical field of high polymer materials. An easy-uncovering film material capable of resisting high-temperature cooking is formed by co-extruding a corona layer, an intermediate layer and a heat-sealing layer; the corona layer material is metallocene polypropylene, or is the mixture of 40-60 wt% of metallocene medium density polyethylene and 40-60 wt% of high density polyethylene; the intermediate layer material is metallocene high-density polyethylene; the heat-sealing layer material is formed by copolymerizing high-density polyethylene (HDPE), polypropylene (PP) and polybutylene (PB 1). The easy-to-tear film material can resist high-temperature steaming at 121 ℃/30min, has higher tensile strength and elongation at break before and after steaming, can be heat-sealed within a wider temperature range of 150 ℃ plus 230 ℃, has high heat-sealing strength and good stability, has good easy-to-tear performance, has good sealing performance of a packaging bag made of the easy-to-tear film material, can ensure that the product does not leak liquid in the transportation and storage processes, and can effectively avoid the loss of contents during unsealing.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a high-temperature-cooking-resistant easy-uncovering film material and a preparation method thereof.
Background
In order to improve the circulation cycle and shelf life of products, packaging materials for food and cosmetic products need to have good mechanical properties such as tensile strength, tear resistance, impact resistance and the like, high sealing properties, barrier properties and chemical stability such as suitability for high-temperature sterilization, low-temperature storage and the like of food and cosmetic products, and easy peeling of the package to avoid loss of contents when the package is opened. The existing PE film has poor high-low temperature resistance, is easy to soften and deform when being steamed at high temperature, is frozen and cracked at low temperature, has low heat sealing strength and poor impact resistance, and the prepared packaging bag has poor sealing performance and barrier performance, is easy to crack and cause leakage and deterioration of contents, is difficult to peel and tear, and is easy to cause leakage and overflow of the contents when being unsealed. Therefore, a film material which can resist high-temperature steaming and has high strength before and after steaming is needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-temperature-cooking-resistant easy-uncovering film material, which can resist high-temperature cooking at 121 ℃/30min, has higher tensile strength and elongation at break before and after cooking, can be subjected to heat sealing within a wider temperature range of 150-230 ℃, has high heat sealing strength and good stability, and is 8-12N/15 mm. The easy-to-tear film material has good easy-to-tear performance, and the packaging bag made of the easy-to-tear film material has good sealing performance, so that the product can be ensured not to leak liquid in the transportation and storage processes, and the loss of contents in unsealing can be effectively avoided.
The technical scheme of the invention is as follows:
an easy-uncovering film material capable of resisting high-temperature cooking is formed by co-extruding a corona layer, an intermediate layer and a heat-sealing layer; the corona layer material is metallocene polypropylene, or is the mixture of 40-60 wt% of metallocene medium density polyethylene and 40-60 wt% of high density polyethylene; the intermediate layer material is metallocene high-density polyethylene; the heat-sealing layer material is formed by copolymerizing high-density polyethylene (HDPE), polypropylene (PP) and polybutylene (PB 1).
Further, the mass ratio of the corona layer to the intermediate layer to the heat-seal layer material is 1-7:1-10: 1-3.
Further, the density of the metallocene medium density polyethylene is 0.93-0.94g/cm3The melt index is 0.2-1g/10 min.
Further, the density of the high-density polyethylene is 0.95 to 0.98g/cm3The melt index is 0.7-1g/10 min.
Further, the metallocene high density polyethylene has a melt index of 0.5 to 1g/10 min.
Respectively adding the corona layer, the middle layer and the heat sealing layer into an extruder for heating and melting, and carrying out co-extrusion, inflation cooling, traction shaping and corona treatment on the melted materials of each layer to obtain the PP/PE easy-to-tear film.
Further, the melt temperature of the corona layer material is 180-220 ℃.
Further, the melt temperature of the intermediate layer material is 170-230 ℃.
Further, the melt temperature of the material of the heat seal layer is 180-220 ℃.
The invention has the following beneficial effects:
the corona layer material can be metallocene polypropylene, the metallocene polypropylene has low specific gravity, good processing performance, scratch resistance and wear resistance, and high thermal deformation temperature and bending modulus; or 40-60 wt% of metallocene medium density polyethylene and 40-60 wt% of high density polyethylene are mixed, the metallocene medium density polyethylene has higher yield strength, tearing strength and impact strength and good toughness, and the high density polyethylene has good flexibility, impact resistance, heat sealing performance and longitudinal and transverse mechanical properties. The intermediate layer is made of metallocene high-density polyethylene which has good transparency, good high-temperature resistance, high heat-sealing strength and low heat-sealing initial temperature. The metallocene polypropylene is matched with various polyethylene materials, so that the corona layer and the middle layer can meet the requirement of high bonding strength with the heat sealing layer, and the sealing performance of the material after bag making can be improved.
The heat sealing layer material is copolymerized by high-density polyethylene, polypropylene and polybutylene, the polypropylene has high transparency, good high-temperature resistance and good easy uncovering performance, so that the heat sealing layer material and various materials, such as PE, PP and the like, have proper uncovering strength; the polybutylene has good flexibility, impact resistance and heat sealing performance, and can improve the sealing performance and easy uncovering performance of the material. The heat sealing layer enables the easy-to-tear film material and various materials to have good heat sealing and easy-to-tear performance and appropriate peeling strength. The easy-to-uncover film is formed by co-extruding materials of all layers, and has good interlayer adhesion, high stability, good mechanical property and high tensile strength. The easy-to-tear film material has good peeling performance, wide heat sealing temperature range, stable heat sealing strength, high temperature steaming resistance at 121 ℃/30min, and high tensile strength and elongation at break before and after steaming.
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
An easy-uncovering film material capable of resisting high-temperature cooking is formed by co-extruding a corona layer, an intermediate layer and a heat-sealing layer; the mass ratio of the corona layer to the intermediate layer to the heat-seal layer material is 7:10: 3;
the corona layer material is formed by mixing 50 wt% of metallocene medium density polyethylene and 50 wt% of high density polyethylene;
the intermediate layer material is metallocene high-density polyethylene;
the heat-sealing layer material is copolymerized by high-density polyethylene (HDPE), polypropylene (PP) and polybutylene (PB 1);
wherein the density of the metallocene medium density polyethylene is 0.934g/cm3The melt index is 0.9g/10 min; the density of the high-density polyethylene is 0.961g/cm3The melt index is 0.85g/10 min; the metallocene high density polyethylene has a melt index of 0.7g/10 min.
Example 2
An easy-uncovering film material capable of resisting high-temperature cooking is formed by co-extruding a corona layer, an intermediate layer and a heat-sealing layer; the mass ratio of the corona layer to the intermediate layer to the heat-seal layer material is 7:10: 3;
the corona layer material is prepared by mixing 40 wt% of metallocene medium density polyethylene and 60 wt% of high density polyethylene;
the intermediate layer material is metallocene high-density polyethylene;
the heat-sealing layer material is copolymerized by high-density polyethylene (HDPE), polypropylene (PP) and polybutylene (PB 1);
wherein, theThe density of the metallocene medium density polyethylene is 0.934g/cm3The melt index is 0.9g/10 min; the density of the high-density polyethylene is 0.961g/cm3The melt index is 0.85g/10 min; the metallocene high density polyethylene has a melt index of 0.7g/10 min.
Example 3
An easy-uncovering film material capable of resisting high-temperature cooking is formed by co-extruding a corona layer, an intermediate layer and a heat-sealing layer; the mass ratio of the corona layer to the intermediate layer to the heat-seal layer material is 7:10: 3;
the corona layer material is metallocene polypropylene;
the intermediate layer material is metallocene high-density polyethylene;
the heat-sealing layer material is copolymerized by high-density polyethylene (HDPE), polypropylene (PP) and polybutylene (PB 1);
wherein the density of the high-density polyethylene is 0.961g/cm3The melt index is 0.85g/10 min; the metallocene high density polyethylene has a melt index of 0.7g/10 min.
The preparation method of the easy-to-uncover film material in the embodiment comprises the steps of respectively adding the corona layer material, the intermediate layer material and the heat-sealing layer material into an extruder for heating and melting, and carrying out co-extrusion, inflation cooling, traction shaping and corona treatment on the melted materials of each layer to obtain the PP/PE easy-to-uncover film; the temperature of the melt of the corona layer material is 220 ℃, the temperature of the melt of the intermediate layer material is 230 ℃, and the temperature of the melt of the heat-seal layer material is 220 ℃.
Comparative example 1
An easy-uncovering film material capable of resisting high-temperature cooking is formed by co-extruding a corona layer, an intermediate layer and a heat-sealing layer; the mass ratio of the corona layer to the intermediate layer to the heat-seal layer material is 7:10: 3;
the corona layer material is prepared by mixing 50 wt% of metallocene polypropylene and 50 wt% of high density polyethylene;
the intermediate layer material is metallocene high-density polyethylene;
the heat-sealing layer material is formed by blending high-density polyethylene (HDPE), polypropylene (PP) and polybutylene (PB 1);
wherein the density of the high-density polyethylene is 0.961g/cm3The melt index is 0.85g/10 min; the metallocene high density polyethylene has a melt index of 0.7g/10 min.
Comparative example 2
An easy-uncovering film material capable of resisting high-temperature cooking is formed by co-extruding a corona layer, an intermediate layer and a heat-sealing layer; the mass ratio of the corona layer to the intermediate layer to the heat-seal layer material is 7:10: 3;
the corona layer material is formed by mixing 50 wt% of metallocene medium density polyethylene and 50 wt% of high density polyethylene;
the intermediate layer material is metallocene high-density polyethylene;
the heat sealing layer material is formed by blending high-density Polyethylene and Polypropylene (PP);
wherein the density of the metallocene medium density polyethylene is 0.934g/cm3The melt index is 0.9g/10 min; the density of the high-density polyethylene is 0.961g/cm3The melt index is 0.85g/10 min; the metallocene high density polyethylene has a melt index of 0.7g/10 min.
The performance of the easy-uncovering film materials of examples 1-3 and comparative examples 1-2 which can resist high-temperature cooking before and after being cooked at 121 ℃/30min is tested, and the test results are shown in the following table:
therefore, the invention can resist high-temperature steaming at 121 ℃/30min, has higher tensile strength and elongation at break before and after steaming, can be heat-sealed in a wider temperature range of 150-.
The easy-to-uncover film material can resist high-temperature cooking at 121 ℃/30min, has higher tensile strength and elongation at break before and after cooking, can be heat-sealed within a wider temperature range of 150 ℃ and 230 ℃, has high heat-sealing strength and good stability, and is 8-12N/15 mm. The easy-to-tear film material has good easy-to-tear performance, and the packaging bag made of the easy-to-tear film material has good sealing performance, so that the product can be ensured not to leak liquid in the transportation and storage processes, and the loss of contents in unsealing can be effectively avoided.
Claims (9)
1. The easy-uncovering film material capable of resisting high-temperature cooking is characterized by being formed by co-extruding a corona layer, an intermediate layer and a heat-sealing layer; the corona layer material is metallocene polypropylene, or is the mixture of 40-60 wt% of metallocene medium density polyethylene and 40-60 wt% of high density polyethylene; the intermediate layer material is metallocene high-density polyethylene; the heat-sealing layer material is formed by copolymerizing high-density polyethylene (HDPE), polypropylene (PP) and polybutylene (PB 1).
2. The autoclavable release film material of claim 1, wherein the mass ratio of the corona layer, the intermediate layer and the heat seal layer material is 1-7:1-10: 1-3.
3. The autoclavable release film material of claim 1, wherein said metallocene medium density polyethylene has a density of 0.93-0.94g/cm3The melt index is 0.2-1g/10 min.
4. The autoclavable release film material of claim 1, wherein said high density polyethylene has a density of 0.95-0.98g/cm3The melt index is 0.7-1g/10 min.
5. The autoclavable release film material of claim 1, wherein said metallocene high density polyethylene has a melt index of 0.5 to 1g/10 min.
6. A preparation method of the easy-to-tear film material as claimed in any one of claims 1-5, wherein the materials of the corona layer, the intermediate layer and the heat-sealing layer are respectively added into an extruder for heating and melting, and the PP/PE easy-to-tear film is obtained by co-extrusion, inflation cooling, traction forming and corona treatment of the melted materials of each layer.
7. The method for preparing easy-to-tear film material as claimed in claim 6, wherein the melt temperature of the corona layer material is 180-220 ℃.
8. The method as claimed in claim 6, wherein the melt temperature of the intermediate layer is 170-230 ℃.
9. The method for preparing easy-to-tear film material as claimed in claim 6, wherein the melt temperature of the material of the heat seal layer is 180-220 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110521209.2A CN113427871A (en) | 2021-05-13 | 2021-05-13 | Easily-torn film material capable of resisting high-temperature cooking and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110521209.2A CN113427871A (en) | 2021-05-13 | 2021-05-13 | Easily-torn film material capable of resisting high-temperature cooking and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113427871A true CN113427871A (en) | 2021-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110521209.2A Pending CN113427871A (en) | 2021-05-13 | 2021-05-13 | Easily-torn film material capable of resisting high-temperature cooking and preparation method thereof |
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| Country | Link |
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| CN (1) | CN113427871A (en) |
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 |
| CN110126407A (en) * | 2019-04-16 | 2019-08-16 | 惠州德昉包装材料有限公司 | Digestion resistant easy takes off film base material film, easily takes off film, preparation method comprising it |
-
2021
- 2021-05-13 CN CN202110521209.2A patent/CN113427871A/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 |
| CN110126407A (en) * | 2019-04-16 | 2019-08-16 | 惠州德昉包装材料有限公司 | Digestion resistant easy takes off film base material film, easily takes off film, preparation method comprising it |
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Application publication date: 20210924 |