CN117283955A - PE film for low-temperature anti-breaking flexible package inner layer and preparation method thereof - Google Patents
PE film for low-temperature anti-breaking flexible package inner layer and preparation method thereof Download PDFInfo
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- CN117283955A CN117283955A CN202311407682.3A CN202311407682A CN117283955A CN 117283955 A CN117283955 A CN 117283955A CN 202311407682 A CN202311407682 A CN 202311407682A CN 117283955 A CN117283955 A CN 117283955A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000010410 layer Substances 0.000 claims abstract description 105
- 239000004698 Polyethylene Substances 0.000 claims abstract description 88
- -1 polyethylene Polymers 0.000 claims abstract description 30
- 229920000573 polyethylene Polymers 0.000 claims abstract description 30
- 239000006057 Non-nutritive feed additive Substances 0.000 claims abstract description 25
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 claims abstract description 17
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000005977 Ethylene Substances 0.000 claims abstract description 17
- 229920001971 elastomer Polymers 0.000 claims abstract description 17
- 239000000806 elastomer Substances 0.000 claims abstract description 17
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 17
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 239000004712 Metallocene polyethylene (PE-MC) Substances 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 9
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 9
- 238000005520 cutting process Methods 0.000 claims abstract description 8
- 238000007664 blowing Methods 0.000 claims abstract description 7
- 238000004804 winding Methods 0.000 claims abstract description 5
- 239000011229 interlayer Substances 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims description 11
- 239000000155 melt Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 claims description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 3
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 claims description 3
- 238000010096 film blowing Methods 0.000 claims description 3
- 229910052731 fluorine Inorganic materials 0.000 claims description 3
- 239000011737 fluorine Substances 0.000 claims description 3
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 claims description 3
- FATBGEAMYMYZAF-UHFFFAOYSA-N oleicacidamide-heptaglycolether Natural products CCCCCCCCC=CCCCCCCCC(N)=O FATBGEAMYMYZAF-UHFFFAOYSA-N 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 238000009459 flexible packaging Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000012528 membrane Substances 0.000 claims 1
- 229920006233 biaxially oriented polyamide Polymers 0.000 abstract description 18
- 238000000034 method Methods 0.000 abstract description 9
- 238000001125 extrusion Methods 0.000 abstract description 7
- 238000011056 performance test Methods 0.000 abstract description 7
- 238000013329 compounding Methods 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012793 heat-sealing layer Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005303 weighing Methods 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
- B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
-
- 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
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- 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
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/242—All polymers belonging to those covered by group B32B27/32
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a PE film for a low-temperature anti-breaking flexible package inner layer and a preparation method thereof, wherein the PE film is formed by co-extrusion of an outer layer, a middle layer and an inner layer; the inner layer is composed of linear low-density metallocene polyethylene, processing aid and smooth opening agent; the middle layer and the outer layer are both composed of low density polyethylene, linear low density polyethylene, polyethylene elastomer copolymerized with octene and ethylene, and processing aid. The interlayer ratio of the outer layer, the middle layer and the inner layer is 3:4:3. The required PE film is prepared by blowing, thickness measuring, rotating, stretching, cooling, corona, edge cutting, film separating and winding. The PE film is compounded with two layers of biaxially oriented BOPA films by a solvent-free compounding process, and after curing, the bag is manufactured to form a soft package structure with the product structure of BOPA// BOPA// PE, the anti-breaking performance of the water after being refrigerated at 0-5 ℃ is tested, and according to the anti-falling performance test specified in GB/T10004, no bag is broken.
Description
Technical Field
The invention belongs to the technical field of PE films, and particularly relates to a PE film for a low-temperature anti-breaking flexible package inner layer and a preparation method thereof.
Background
In the plastic flexible packaging industry, PE films, namely polyethylene films, are the most widely used polymer materials. The PE film prepared from polyethylene granules through blow molding or casting process has good chemical stability, low temperature resistance, flexibility and the like, and especially has obvious price advantage, and the PE film has good heat sealing property so that the PE film is used in a large amount as a heat sealing film in plastic flexible packages.
In practical application, various problems occur due to different use environments and conditions, such as phenomena of edge burst, package breakage and the like caused by inertia when packaging bags filled with flowable contents need to be packaged and transported, and thus, unnecessary losses and pollution are caused, especially in winter in the north, and the phenomena are more serious.
Disclosure of Invention
The invention provides a PE film for a low-temperature anti-breaking flexible package inner layer and a preparation method thereof, and aims to solve the problems of bag breaking, edge bursting and the like caused by inertia and collision in the transportation process of a packaging bag, particularly greatly improve the problems in a low-temperature and freezing environment, and can be widely produced and replaced.
The invention discloses a PE film for a low-temperature anti-breaking flexible package inner layer, which is formed by co-extrusion of an outer layer, a middle layer and an inner layer;
the inner layer consists of the following raw materials in parts by weight:
96-98 parts of linear low-density metallocene polyethylene, 0.5-0.7 part of processing aid and 1.5-2.3 parts of smooth opening agent;
the middle layer consists of the following raw materials in parts by weight:
10-15 parts of low-density polyethylene, 55-80 parts of linear low-density polyethylene, 10-30 parts of polyethylene elastomer copolymerized by octene and ethylene and 0.5-0.7 part of processing aid;
the outer layer consists of the following raw materials in parts by weight:
15-20 parts of low-density polyethylene, 60-75 parts of linear low-density polyethylene, 10-20 parts of polyethylene elastomer copolymerized by octene and ethylene and 0.5-0.7 part of processing aid;
wherein the interlayer ratio of the outer layer, the middle layer and the inner layer is 3:4:3.
Further, the linear low-density metallocene polyethylene has a density of 0.908-0.920g/cm3 and a melt index of 0.2-0.25g/min.
Furthermore, the processing aid is fluorine anti-adhesion master batch.
Furthermore, the smooth opening agent is the compound of oleamide/erucamide and natural silicon opening agent.
Further, the low density polyethylene is high pressure polyethylene.
Further, the linear low density polyethylene has a density of 0.915 to 0.940g/cm3 and a melt index of 1.8 to 2.0g/min.
Further, the polyethylene elastomer copolymerized with octene and ethylene is POE.
The invention also discloses a preparation method of the PE film, which comprises the following steps:
respectively obtaining the raw materials required by the preparation of the outer layer, the middle layer and the inner layer according to the proportion, and fully mixing;
respectively adding the mixed outer layer, middle layer and inner layer raw materials into each screw rod of an up-blowing film blowing machine, wherein the gradient temperature of the outer layer is set to 170 ℃,175 ℃,180 ℃,180 ℃ and 180 ℃; the middle layer is set at 170 ℃,175 ℃,180 ℃,185 ℃ and 190 ℃; the inner layer is set at 170 ℃,175 ℃,180 ℃,180 ℃ and 180 ℃;
the required PE film is prepared by blowing, thickness measuring, rotating, stretching, cooling, corona, edge cutting, film separating and winding.
Compared with the prior art, the invention has the beneficial effects that: the processing mode of the PE film for the low-temperature anti-breaking flexible package inner layer is consistent with that of the existing mature PE upblowing process, but the PE film has the specificity of processing temperature and raw material selection, and the anti-breaking performance of the PE film at low temperature is obviously better than that of a common PE product after the PE film passes through the composite PA film.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a PE film for a low-temperature anti-breaking flexible package inner layer, which is formed by 3 layers of co-extrusion, wherein the inner layer, namely a heat sealing layer, is formed by mixing 90-98 parts of linear low-density metallocene polyethylene, 0.1-1.0 part of processing aid and 1-5 parts of smooth opening agent; the middle layer and the outer layer are formed by mixing 5-20 parts of low-density polyethylene, 50-80 parts of linear low-density polyethylene, 10-30 parts of polyethylene elastomer copolymerized by octene and ethylene and 0.1-1 part of processing aid, and the interlayer ratio of the outer layer to the middle layer to the inner layer is 3:4:3.
Respectively adding three layers of materials into each screw of an up-blowing film blowing machine, wherein the outer layer is set to have gradient temperature: 170 ℃,175 ℃,180 ℃,180 ℃ and 180 ℃. Middle layer set temperature: 170 ℃,175 ℃,180 ℃,185 ℃ and 190 ℃. The inner layer is set at a temperature of 170 ℃,175 ℃,180 ℃,180 ℃ and 180 ℃.
The required PE film is prepared by blowing, thickness measuring, rotating, stretching, cooling, corona, edge cutting, film separating and winding. The PE film is compounded with two layers of biaxially oriented BOPA films by a solvent-free compounding process, and after curing, the bag is manufactured to form a soft package structure with the product structure of BOPA// BOPA// PE, the anti-breaking performance of the product after the water is refrigerated at 0-5 ℃ is tested, and according to the anti-falling performance test specified in GB/T10004, the anti-breaking performance of the product manufactured by the PE with the formula is better than that of the conventional PE product.
Wherein the linear low density metallocene polyethylene has a density of 0.908-0.920g/cm3 and a melt index of 0.2-0.25g/min, such as: exxon mobil 2012MK, dow chemical 6202, etc.;
the processing aid is fluorine anti-adhesion master batch, such as PPA;
the smooth opening agent is the compound of oleamide or erucamide and natural silicon opening agents, such as Kang Sitan Pu 6525 or friendship 8968;
the low-density polyethylene is high-pressure polyethylene;
the density of the linear low density polyethylene is 0.915-0.940g/cm3, and the melt index is 1.8-2.0g/min, such as elm 7042;
the polyethylene elastomer copolymerized by octene and ethylene is POE, such as Mitsui 1085s, etc.;
and inputting the formula materials and the proportions of the outer layer, the middle layer and the inner layer of the PE film into an automatic batching system. The required materials are sucked into a weighing device through an automatic material sucking device, the required materials are added according to the formula proportion, after the ingredients are completely mixed, the mixed materials are sent into a storage bin of a machine table, a heating device and each layer of screw rod are stirred and extruded to form a melt, the melt is extruded through a die head and then blown into an annular film bubble, finally, the PE film is prepared through traction and air ring cooling shaping,
the temperature of the inner layer screw is set to be 180-190 ℃; the setting temperature of the middle layer screw rod and the outer layer screw rod is 170-180 ℃, and the outer layer of the PE film is required to be subjected to corona technology, so that the corona value of the PE film reaches more than 40 dynes after the PE film is wound; the PE film thickness can be adjusted to 40-120 μm.
The PE film and method of the present invention are further described below with reference to specific examples.
Example 1:
the inner layer is prepared by mixing 97.4 parts of linear low-density metallocene polyethylene, 0.6 part of processing aid and 2 parts of smooth opening agent, and the mixture is added into an inner screw, wherein the temperature is set to be 170 ℃,175 ℃,180 ℃,180 ℃ and 180 ℃.
10 parts of high-pressure polyethylene, 74.4 parts of linear low-density polyethylene, 15 parts of polyethylene elastomer copolymerized by octene and ethylene and 0.6 part of processing aid are added into a middle screw, and the temperature is set at the middle layer: 170 ℃,175 ℃,180 ℃,185 ℃ and 190 ℃.
The outer layer is added into an outer layer screw according to 15 parts of high-pressure polyethylene, 69.4 parts of linear low-density polyethylene, 15 parts of polyethylene elastomer copolymerized by octene and ethylene and 0.6 part of processing aid, and the temperature is set: 170 ℃,175 ℃,180 ℃,185 ℃ and 190 ℃.
Setting the proportion between three layers of co-extrusion layers: the outer/middle/inner is 3/4/3. Through inflation, thickness measurement, rotation, stretching, cooling, corona, edge cutting, film separation and winding, the required PE film thickness of 50um is prepared.
The PE film is compounded with two layers of biaxially oriented BOPA films by a solvent-free compounding process, and after curing, the bag is manufactured to form a soft package structure with the product structure of BOPA// BOPA// PE, the anti-breaking performance of the water after being refrigerated at 0-5 ℃ is tested, and according to the anti-falling performance test specified in GB/T10004, no bag is broken.
Example 2:
the inner layer is prepared by mixing 97.4 parts of linear low-density metallocene polyethylene, 0.6 part of processing aid and 2 parts of smooth opening agent, and the mixture is added into an inner screw, wherein the temperature is set to be 170 ℃,175 ℃,180 ℃,180 ℃ and 180 ℃.
10 parts of high-pressure polyethylene, 79.4 parts of linear low-density polyethylene, 10 parts of polyethylene elastomer copolymerized by octene and ethylene and 0.6 part of processing aid are added into a middle screw, and the temperature is set at the middle screw: 170 ℃,175 ℃,180 ℃,185 ℃ and 190 ℃.
The outer layer is added into an outer layer screw according to 15 parts of high-pressure polyethylene, 74.4 parts of linear low-density polyethylene, 10 parts of polyethylene elastomer copolymerized by octene and ethylene and 0.6 part of processing aid, and the temperature is set: 170 ℃,175 ℃,180 ℃,185 ℃ and 190 ℃.
Setting the proportion between three layers of co-extrusion layers: the outer/middle/inner is 3/4/3. The required PE film 50um is prepared after inflation, thickness measurement, rotation, stretching, cooling, corona, edge cutting, film separation and rolling.
The PE film is compounded with two layers of biaxially oriented BOPA films by a solvent-free compounding process, and after curing, the bag is manufactured to form a soft package structure with the product structure of BOPA// BOPA// PE, the anti-breaking performance of the water after being refrigerated at 0-5 ℃ is tested, and according to the anti-falling performance test specified in GB/T10004, no bag is broken.
Example 3:
the inner layer is prepared by mixing 97.4 parts of linear low-density metallocene polyethylene, 0.6 part of processing aid and 2 parts of smooth opening agent, and the mixture is added into an inner screw, wherein the temperature is set to be 170 ℃,175 ℃,180 ℃,180 ℃ and 180 ℃.
10 parts of high-pressure polyethylene, 69.4 parts of linear low-density polyethylene, 20 parts of polyethylene elastomer copolymerized by octene and ethylene and 0.6 part of processing aid are added into a middle screw, and the temperature is set at the middle screw: 170 ℃,175 ℃,180 ℃,185 ℃ and 190 ℃.
The outer layer is added into an outer layer screw according to 15 parts of high-pressure polyethylene, 64.4 parts of linear low-density polyethylene, 20 parts of polyethylene elastomer copolymerized by octene and ethylene and 0.6 part of processing aid, and the temperature is set: 170 ℃,175 ℃,180 ℃,185 ℃ and 190 ℃.
Setting the proportion between three layers of co-extrusion layers: the outer/middle/inner is 3/4/3. The required PE film 70um is prepared after inflation, thickness measurement, rotation, stretching, cooling, corona, edge cutting, film separation and rolling.
The PE film is compounded with two layers of biaxially oriented BOPA films by a solvent-free compounding process, and after curing, the bag is manufactured to form a soft package structure with the product structure of BOPA// BOPA// PE, the anti-breaking performance of the water after being refrigerated at 0-5 ℃ is tested, and according to the anti-falling performance test specified in GB/T10004, no bag is broken.
Example 4:
the inner layer is prepared by mixing 97.4 parts of linear low-density metallocene polyethylene, 0.6 part of processing aid and 2 parts of smooth opening agent, and the mixture is added into an inner screw, wherein the temperature is set to be 170 ℃,175 ℃,180 ℃,180 ℃ and 180 ℃.
The middle layer is added into a middle layer screw according to 10 parts of high-pressure polyethylene, 59.4 parts of linear low-density polyethylene, 30 parts of polyethylene elastomer copolymerized by octene and ethylene and 0.6 part of processing aid, and the temperature is set at the middle layer: 170 ℃,175 ℃,180 ℃,185 ℃ and 190 ℃.
The outer layer is added into an outer layer screw according to 20 parts of high-pressure polyethylene, 69.4 parts of linear low-density polyethylene, 10 parts of polyethylene elastomer copolymerized by octene and ethylene and 0.6 part of processing aid, and the temperature is set: 170 ℃,175 ℃,180 ℃,185 ℃ and 190 ℃.
Setting the proportion between three layers of co-extrusion layers: the outer/middle/inner is 3/4/3. The required PE film 50um is prepared after inflation, thickness measurement, rotation, stretching, cooling, corona, edge cutting, film separation and rolling.
The PE film is compounded with two layers of biaxially oriented BOPA films by a solvent-free compounding process, and after curing, the bag is manufactured to form a soft package structure with the product structure of BOPA// BOPA// PE, the anti-breaking performance of the water after being refrigerated at 0-5 ℃ is tested, and according to the anti-falling performance test specified in GB/T10004, no bag is broken.
As can be seen from the performance test of the PE film prepared by the embodiment, the PE film has excellent low-temperature breaking resistance after being compounded with double-layer nylon.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. The utility model provides a PE membrane is used to low temperature anti broken flexible packaging inlayer, forms through skin, middle level and inlayer coextrusion, its characterized in that:
the inner layer consists of the following raw materials in parts by weight:
96-98 parts of linear low-density metallocene polyethylene, 0.5-0.7 part of processing aid and 1.5-2.3 parts of smooth opening agent;
the middle layer consists of the following raw materials in parts by weight:
10-15 parts of low-density polyethylene, 55-80 parts of linear low-density polyethylene, 10-30 parts of polyethylene elastomer copolymerized by octene and ethylene and 0.5-0.7 part of processing aid;
the outer layer consists of the following raw materials in parts by weight:
15-20 parts of low-density polyethylene, 60-75 parts of linear low-density polyethylene, 10-20 parts of polyethylene elastomer copolymerized by octene and ethylene and 0.5-0.7 part of processing aid;
wherein the interlayer ratio of the outer layer, the middle layer and the inner layer is 3:4:3.
2. The PE film for an inner layer of a low-temperature shatter-resistant flexible package according to claim 1, characterized in that: the density of the linear low-density metallocene polyethylene is 0.908-0.920g/cm3, and the melt index is 0.2-0.25g/min.
3. The PE film for an inner layer of a low-temperature shatter-resistant flexible package according to claim 1, characterized in that: the processing aid is fluorine anti-adhesion master batch.
4. The PE film for an inner layer of a low-temperature shatter-resistant flexible package according to claim 1, characterized in that: the smooth opening agent is the compound of oleamide/erucamide and natural silicon opening agent.
5. The PE film for an inner layer of a low-temperature shatter-resistant flexible package according to claim 1, characterized in that: the low density polyethylene is high pressure polyethylene.
6. The PE film for an inner layer of a low-temperature shatter-resistant flexible package according to claim 1, characterized in that: the density of the linear low density polyethylene is 0.915-0.940g/cm3, and the melt index is 1.8-2.0g/min.
7. The PE film for an inner layer of a low-temperature shatter-resistant flexible package according to claim 1, characterized in that: the polyethylene elastomer copolymerized by octene and ethylene is POE.
8. A method for producing a PE film according to any one of claims 1 to 7, comprising the steps of:
respectively obtaining the raw materials required by the preparation of the outer layer, the middle layer and the inner layer according to the proportion, and fully mixing;
respectively adding the mixed outer layer, middle layer and inner layer raw materials into each screw rod of an up-blowing film blowing machine, wherein the gradient temperature of the outer layer is set to 170 ℃,175 ℃,180 ℃,180 ℃ and 180 ℃; the middle layer is set at 170 ℃,175 ℃,180 ℃,185 ℃ and 190 ℃; the inner layer is set at 170 ℃,175 ℃,180 ℃,180 ℃ and 180 ℃;
the required PE film is prepared by blowing, thickness measuring, rotating, stretching, cooling, corona, edge cutting, film separating and winding.
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| CN204210119U (en) * | 2014-03-05 | 2015-03-18 | 河北奇特包装有限责任公司 | Monosodium glutamate automatic packaging machine composite membrane |
| CN104512080A (en) * | 2014-12-12 | 2015-04-15 | 浙江诚德包装有限公司 | Low-temperature dropping resistant film and its application |
| CN104691071A (en) * | 2015-02-11 | 2015-06-10 | 广东南海星格新型包装材料有限公司 | Puncture-resistant packaging film and preparation method thereof |
| CN109177415A (en) * | 2018-09-29 | 2019-01-11 | 浙江金石包装有限公司 | A kind of package compound film and preparation method thereof |
| CN110466225A (en) * | 2019-09-16 | 2019-11-19 | 福建立邦包装有限公司 | A kind of CPE heat-sealing composite membrane and preparation method thereof |
| CN110605892A (en) * | 2019-09-27 | 2019-12-24 | 黄山永新股份有限公司 | Large-gram-weight liquid self-supporting bag packaging material and preparation method thereof |
| CN213056336U (en) * | 2020-04-24 | 2021-04-27 | 大连巨通塑料制品有限公司 | Puncture-resistant high-barrier co-extrusion film |
| CN216683634U (en) * | 2021-12-17 | 2022-06-07 | 哈尔滨鹏程药用包装新材料科技股份有限公司 | Multilayer co-extrusion bubble vacuum standing bag film |
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| CN204210119U (en) * | 2014-03-05 | 2015-03-18 | 河北奇特包装有限责任公司 | Monosodium glutamate automatic packaging machine composite membrane |
| CN104512080A (en) * | 2014-12-12 | 2015-04-15 | 浙江诚德包装有限公司 | Low-temperature dropping resistant film and its application |
| CN104691071A (en) * | 2015-02-11 | 2015-06-10 | 广东南海星格新型包装材料有限公司 | Puncture-resistant packaging film and preparation method thereof |
| CN109177415A (en) * | 2018-09-29 | 2019-01-11 | 浙江金石包装有限公司 | A kind of package compound film and preparation method thereof |
| CN110466225A (en) * | 2019-09-16 | 2019-11-19 | 福建立邦包装有限公司 | A kind of CPE heat-sealing composite membrane and preparation method thereof |
| CN110605892A (en) * | 2019-09-27 | 2019-12-24 | 黄山永新股份有限公司 | Large-gram-weight liquid self-supporting bag packaging material and preparation method thereof |
| CN213056336U (en) * | 2020-04-24 | 2021-04-27 | 大连巨通塑料制品有限公司 | Puncture-resistant high-barrier co-extrusion film |
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