CN114604526A - Low-temperature-resistant freezing and semi-high-temperature-resistant steaming and boiling ultra-soft packaging film - Google Patents
Low-temperature-resistant freezing and semi-high-temperature-resistant steaming and boiling ultra-soft packaging film Download PDFInfo
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- CN114604526A CN114604526A CN202210312352.5A CN202210312352A CN114604526A CN 114604526 A CN114604526 A CN 114604526A CN 202210312352 A CN202210312352 A CN 202210312352A CN 114604526 A CN114604526 A CN 114604526A
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- 229920006280 packaging film Polymers 0.000 title claims abstract description 21
- 238000007710 freezing Methods 0.000 title claims abstract description 20
- 230000008014 freezing Effects 0.000 title claims abstract description 15
- 238000010025 steaming Methods 0.000 title claims description 15
- 238000009835 boiling Methods 0.000 title claims description 3
- 239000010410 layer Substances 0.000 claims abstract description 57
- 239000012792 core layer Substances 0.000 claims abstract description 33
- 239000012793 heat-sealing layer Substances 0.000 claims abstract description 29
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000004743 Polypropylene Substances 0.000 claims abstract description 6
- 229920001155 polypropylene Polymers 0.000 claims abstract description 6
- -1 polypropylene Polymers 0.000 claims abstract description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 24
- 229920006124 polyolefin elastomer Polymers 0.000 claims description 15
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- 238000005266 casting Methods 0.000 claims description 9
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- 229920005629 polypropylene homopolymer Polymers 0.000 claims description 6
- 238000003851 corona treatment Methods 0.000 claims description 4
- 238000010791 quenching Methods 0.000 claims description 4
- 230000000171 quenching effect Effects 0.000 claims description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 3
- 239000005977 Ethylene Substances 0.000 claims description 3
- 238000010411 cooking Methods 0.000 abstract description 28
- 239000005025 cast polypropylene Substances 0.000 abstract description 9
- 239000002994 raw material Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 238000003860 storage Methods 0.000 abstract description 3
- 241001391944 Commicarpus scandens Species 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 15
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- 238000004806 packaging method and process Methods 0.000 description 6
- 208000003643 Callosities Diseases 0.000 description 3
- 206010020649 Hyperkeratosis Diseases 0.000 description 3
- 239000002985 plastic film Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
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- 238000012986 modification Methods 0.000 description 2
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- 229910052782 aluminium Inorganic materials 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- 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
- B32B2250/00—Layers arrangement
- B32B2250/03—3 layers
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- 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
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/242—All polymers belonging to those covered by group B32B27/32
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- 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
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- 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
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
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- 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
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
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- 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
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
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- 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
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/582—Tearability
- B32B2307/5825—Tear resistant
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- 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
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Wrappers (AREA)
Abstract
The invention provides a low-temperature-freezing-resistant and semi-high-temperature-cooking-resistant ultra-soft packaging film, which belongs to the technical field of packaging films and comprises a heat sealing layer, a core layer positioned below the heat sealing layer and a corona layer positioned below the core layer. The invention has convenient preparation, changes the crystallinity of polypropylene in the film forming process by blending raw materials, improves the flexibility and low temperature resistance of the film, is not easy to break and not hard at low temperature, and achieves the aims of resisting half high temperature cooking at 125 ℃, resisting freezing storage at-25 ℃ and having low bag breaking rate; the product of the invention has the properties of good transparency, high glossiness, good flatness, high toughness, impact resistance, tear resistance, puncture resistance and the like of the cast polypropylene film, and can meet the use requirements of the market.
Description
Technical Field
The invention relates to the technical field of packaging films, in particular to a low-temperature-freezing-resistant and semi-high-temperature-cooking-resistant super-soft packaging film.
Background
The cooking film can be divided into: the semi-high temperature cooking film (121 ℃ for 30 min), the high temperature cooking film (135 ℃ for 30 min), the cooking film is compounded with PA, PET, aluminum foil and the like, and the composite packaging film is used for packaging products needing high temperature cooking and sterilization, such as meat, sauce, agricultural products, medical supplies and the like. The semi-high temperature cooking film produced by the prior art has low physical and chemical performance index, can only resist cooking at 121 ℃, and can deform seriously when the cooking temperature is higher than 121 ℃.
In addition, the existing semi-high temperature cooking film product becomes brittle at low temperature, and for the product stored in the double-layer package of the inner bag and the outer bag, the outer bag is easily punctured by the edges and corners of the inner bag when the outer bag is packaged, so that the package breakage rate is high, which is the characteristic of the cast polypropylene film and can not meet the requirements of packaging and storage under the condition of low temperature. Most of corns in the current market are planted in northeast China, and the corns need to be steamed and sterilized at high temperature and then transported and circulated in a low-temperature environment during circulation, so that the existing cast polypropylene steamed film product cannot meet the requirement of corn packaging.
Therefore, it is desirable to provide a low temperature freezing resistant and semi-high temperature steaming resistant ultra-soft packaging film to solve the existing problems.
Disclosure of Invention
In view of the above, the invention provides a low-temperature-freezing-resistant and semi-high-temperature-steaming-resistant ultra-soft packaging film, which is used for solving the problems that the common semi-high-temperature-steaming film is crisp at low temperature, high in bag breaking rate and the like, and can not meet the requirements of the corn packaging market.
In order to solve the technical problems, the invention provides a low-temperature-freezing-resistant and semi-high-temperature-cooking-resistant super-soft packaging film which comprises a heat sealing layer, a core layer positioned below the heat sealing layer and a corona layer positioned below the core layer.
The total thickness of heat-seal layer, sandwich layer and corona layer is 60-120 mu m, the heat-seal layer is 18-22% of total thickness, the sandwich layer is 58-64% of total thickness, the corona layer is 18-20% of total thickness.
The heat sealing layer is a copolymerized polypropylene layer added with a slipping agent and an anti-sticking agent; the core layer is a blending layer of polypropylene copolymer and polyolefin elastomer; the corona layer is a co-polypropylene and homo-polypropylene blending layer with the surface subjected to spark corona treatment.
The heat-sealing layer, the core layer and the corona layer are respectively plasticized and extruded by an extruder to form a melt, and the melt is made through a casting process of quenching by a casting roller after flowing out through a T-shaped die head.
The content of the slipping agent is 1600-2500 ppm, and the content of the anti-sticking agent is 1600-2500 ppm.
The polyolefin elastomer content is 30-50% of the core layer weight.
The polyolefin elastomer is an ethylene-alpha-olefin copolymer, and the weight content of ethylene in the ethylene-alpha-olefin copolymer is 10-20%.
The technical scheme of the invention at least comprises the following beneficial effects:
1. the invention has convenient preparation, changes the crystallinity of polypropylene in the film forming process by blending raw materials, improves the flexibility and low temperature resistance of the film, is not easy to break and not hard at low temperature, and achieves the aims of resisting half high temperature cooking at 125 ℃, resisting freezing storage at-25 ℃ and having low bag breaking rate.
2. The product of the invention has the properties of good transparency, high glossiness, good flatness, high toughness, impact resistance, tear resistance, puncture resistance and the like of the cast polypropylene film, and can meet the use requirements of the market.
Drawings
FIG. 1 is a schematic structural diagram in an embodiment of the present invention;
in the figure: 1. a heat seal layer; 2. a core layer; 3. And (4) a corona layer.
Detailed Description
As shown in fig. 1: a low-temperature-freezing-resistant and semi-high-temperature-cooking-resistant ultra-soft packaging film comprises a heat-sealing layer 1, a core layer 2 positioned below the heat-sealing layer, and a corona layer 3 positioned below the core layer. The total thickness of heat-seal layer 1, sandwich layer 2 and corona layer 3 is 60-120 mu m, and heat-seal layer 1 is 18-22% of total thickness, sandwich layer 2 is 58-64% of total thickness, corona layer 3 is 18-20% of total thickness. The heat sealing layer 1 is a copolymerized polypropylene layer added with a slipping agent and an anti-sticking agent, the content of the slipping agent is 1600-2500 ppm, the content of the anti-sticking agent is 1600-2500 ppm, and the friction coefficient of the film is smaller than 0.18; the core layer 2 is a blending layer of polypropylene copolymer and polyolefin elastomer, and the content of the polyolefin elastomer isThe weight of the core layer is 30-50%, the polyolefin elastomer is ethylene-alpha-olefin copolymer, the weight content of ethylene in the ethylene-alpha-olefin copolymer is 10-20%, and the density of the ethylene-alpha-olefin copolymer is 0.85-0.88 g/cm3(ii) a The corona layer 3 is a blending layer of polypropylene copolymer and polypropylene homopolymer, the surface of which is subjected to spark corona treatment, and the surface of the blending layer is subjected to spark corona treatment so that the surface tension of the blending layer reaches more than 38 mN/m.
The heat-sealing layer 1, the core layer 2 and the corona layer 3 are respectively plasticized and extruded by an extruder to form a melt, and the melt flows out through a T-shaped die head and then is prepared by a casting process of quenching by a casting roll.
Example 1:
as shown in fig. 1, the ultra-soft packaging film with low temperature freezing resistance and semi-high temperature steaming resistance comprises a heat sealing layer 1, a core layer 2 positioned below the heat sealing layer, and a corona layer 3 positioned below the core layer. The heat sealing layer 1 is made of polypropylene copolymer, and is added with a slipping agent and an anti-sticking agent, wherein the content of the anti-sticking agent is 2500ppm, and the content of the slipping agent is 1800 ppm. The core layer 2 is a blend of polypropylene copolymer and polyolefin elastomer, wherein the weight content of the polyolefin elastomer in the blend is 50%. The corona layer 3 is made of a blend of polypropylene copolymer and polypropylene homopolymer.
The raw materials of the heat-sealing layer 1, the core layer 2 and the corona layer 3 are plasticized and extruded by an extruder at 240 ℃, then cast by a T-shaped die head at 230 ℃, quenched by a casting roll at 30 ℃ to form a film, the surface of the corona layer 3 is subjected to corona spark treatment to ensure that the surface tension is more than 38mN/m, and then the film is wound at the speed of 40 m/min. The thickness of the film product is 90 μm, wherein the heat-sealing layer 1 accounts for 20%, the core layer 2 accounts for 59%, and the corona layer 3 accounts for 21%.
The following tests were carried out on the prepared film products:
(1) cooking test: a200 mm square sample was cut out, and 200mm long and 100mm wide pouches were formed on a heat seal tester, and 50ml of aqueous solvent was separately injected and sealed on the heat seal tester. And (3) placing the sealed pocket in a back pressure cooking pot, cooking at 125 ℃ for 45min, opening a pressure reducing valve to release pressure when the back pressure cooking pot is cooled to be below 90 ℃, and taking out a test sample for judgment. The test results are shown in Table 1.
(2) Thermal deformation test: cutting a square sample with the length of 100 multiplied by 100mm, placing the sample in a back pressure cooking pot, cooking at 125 ℃ for 45min, opening a pressure reducing valve to release pressure when the back pressure cooking pot is cooled to be below 90 ℃, and measuring the size of the square sample. The test results are shown in Table 1.
(3) Dart impact test: the prepared film product is placed at the temperature of minus 25 ℃ for not less than 4 hours, and then the samples are subjected to the free dart method part 1 according to the test method of the impact resistance of the plastic films and the sheets of GB/T9639.1-2008: and (3) performing a dart impact test by a step method, and testing the low-temperature resistance and impact resistance of the prepared film product. The test results are shown in Table 1.
(4) Friction coefficient test: and (3) carrying out a friction coefficient test on the prepared film product according to GB10006-88 'measuring method for friction coefficients of plastic films and sheets', and testing the friction coefficient of the prepared film product. The test results are shown in Table 1.
Example 2:
as shown in fig. 1, the ultra-soft packaging film with low temperature freezing resistance and semi-high temperature steaming resistance comprises a heat sealing layer 1, a core layer 2 positioned below the heat sealing layer, and a corona layer 3 positioned below the core layer. The heat sealing layer 1 is made of polypropylene copolymer, and is added with a slipping agent and an anti-sticking agent, wherein the content of the anti-sticking agent is 2500ppm, and the content of the slipping agent is 1800 ppm. The core layer 2 is a blend of polypropylene copolymer and polyolefin elastomer, wherein the weight content of the polyolefin elastomer in the blend is 50%. The corona layer 3 is prepared by blending polypropylene copolymer and polypropylene homopolymer.
The raw materials of the heat-sealing layer 1, the core layer 2 and the corona layer 3 are plasticized and extruded by an extruder at 240 ℃, then the raw materials are cast by a T-shaped die head at 230 ℃, a film is formed by quenching by a casting roll at 30 ℃, the surface of the corona layer 3 is subjected to corona spark treatment to ensure that the surface tension is more than 38mN/m, and then the raw materials are wound at 40 m/min. The thickness of the film product is 80 μm, wherein the heat-sealing layer 1 accounts for 20%, the core layer 2 accounts for 59%, and the corona layer 3 accounts for 21%.
The prepared film products were tested according to the test method of example 1, and the test results are shown in table 1.
Example 3:
as shown in fig. 1, the ultra-soft packaging film with low temperature freezing resistance and semi-high temperature steaming resistance comprises a heat sealing layer 1, a core layer 2 positioned below the heat sealing layer, and a corona layer 3 positioned below the core layer. The heat sealing layer 1 is made of polypropylene copolymer, and is added with a slipping agent and an anti-sticking agent, wherein the content of the anti-sticking agent is 2500ppm, and the content of the slipping agent is 1800 ppm. The core layer 2 is a blend of polypropylene copolymer and polyolefin elastomer, wherein the weight content of the polyolefin elastomer in the blend is 50%. The corona layer 3 is prepared by blending polypropylene copolymer and polypropylene homopolymer.
The raw materials of the heat-sealing layer 1, the core layer 2 and the corona layer 3 are plasticized and extruded by an extruder at 240 ℃, then cast by a T-shaped die head at 230 ℃, quenched by a casting roll at 30 ℃ to form a film, the surface of the corona layer 3 is subjected to corona spark treatment to ensure that the surface tension is more than 38mN/m, and then the film is wound at the speed of 40 m/min. The thickness of the film product is 70 μm, wherein the heat-sealing layer 1 accounts for 20%, the core layer 2 accounts for 59%, and the corona layer 3 accounts for 21%.
The prepared film products were tested according to the test method of example 1, and the test results are shown in table 1.
Table 1: test results
Through the analysis of performance test data of products with three different thicknesses, the three performances of the invention, namely the cooking performance, the heat shrinkage rate and the friction coefficient, are consistent with those of the soft type cooking CPP film on the market, but the low-temperature dart impact strength is obviously better than that of the soft type cooking CPP film on the market (the low-temperature dart impact strength (-25 ℃, 4 hr) A method g of the soft type cooking CPP film on the market is below 200 g). And long-term tracking statistics of mass-packaged corns of customers shows that the corn packaging bag made of the CPP film is very soft before and after cooking, the bag breaking rate is lower than 1 per thousand, and the bag breaking rate of the corn bag made of the soft-type cooking CPP film in the current market is basically about 2 per thousand. Therefore, the invention has great performance advantages in packaging food which needs to be cooked and sterilized and needs to be stored at low temperature.
The foregoing is a preferred embodiment of the present invention, and it should be noted that it would be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the principles of the invention, and such modifications and enhancements are also considered to be within the scope of the invention.
Claims (7)
1. A low-temperature-resistant freezing and semi-high-temperature-resistant steaming and boiling ultra-soft packaging film is characterized in that: comprises a heat sealing layer (1), a core layer (2) positioned below the heat sealing layer and a corona layer (3) positioned below the core layer.
2. The low temperature freezing resistant and semi-high temperature steaming resistant ultra-soft packaging film according to claim 1, which is characterized in that: the total thickness of heat-seal layer (1), sandwich layer (2) and corona layer (3) is 60-120 mu m, heat-seal layer (1) is 18-22% of total thickness, sandwich layer (2) is 58-64% of total thickness, corona layer (3) is 18-20% of total thickness.
3. The low temperature freezing resistant and semi-high temperature steaming resistant ultra-soft packaging film according to claim 1, which is characterized in that: the heat sealing layer (1) is a copolymerized polypropylene layer added with a slipping agent and an anti-sticking agent; the core layer (2) is a blending layer of polypropylene copolymer and polyolefin elastomer; the corona layer (3) is a blending layer of polypropylene copolymer and polypropylene homopolymer, the surface of which is subjected to spark corona treatment.
4. The low temperature freezing resistant and semi-high temperature steaming resistant ultra-soft packaging film according to claim 1, which is characterized in that: the heat-sealing layer (1), the core layer (2) and the corona layer (3) are respectively plasticized and extruded by an extruder to form a melt, and the melt is prepared by a casting process of quenching by a casting roller after flowing out of a T-shaped die head.
5. The low temperature freezing resistant and semi-high temperature steaming resistant ultra-soft packaging film according to claim 3, characterized in that: the content of the slipping agent is 1600-2500 ppm, and the content of the anti-sticking agent is 1600-2500 ppm.
6. The low temperature freezing resistant and semi-high temperature steaming resistant ultra-soft packaging film according to claim 3, characterized in that: the polyolefin elastomer content is 30-50% of the core layer weight.
7. The ultra-soft packaging film with low temperature freezing resistance and semi-high temperature steaming resistance according to claim 3 or 6, which is characterized in that: the polyolefin elastomer is an ethylene-alpha-olefin copolymer, and the weight content of ethylene in the ethylene-alpha-olefin copolymer is 10-20%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115139615A (en) * | 2022-08-25 | 2022-10-04 | 河北泰达包装材料有限公司 | Flexible package modified CPP film and production method thereof |
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| CN114603959A (en) * | 2022-03-28 | 2022-06-10 | 河南鸿鹄新材料有限公司 | Low-temperature heat-sealing CPP film |
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| 徐百平主编: "《塑料挤出成型技术》", 31 March 2010, 中国轻工业出版社, pages: 869 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115139615A (en) * | 2022-08-25 | 2022-10-04 | 河北泰达包装材料有限公司 | Flexible package modified CPP film and production method thereof |
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