CN112477347B - 115-DEG C-resistant polyethylene cast film, production method thereof and packaging bag - Google Patents
115-DEG C-resistant polyethylene cast film, production method thereof and packaging bag Download PDFInfo
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- CN112477347B CN112477347B CN202011337187.6A CN202011337187A CN112477347B CN 112477347 B CN112477347 B CN 112477347B CN 202011337187 A CN202011337187 A CN 202011337187A CN 112477347 B CN112477347 B CN 112477347B
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- 239000004698 Polyethylene Substances 0.000 title claims abstract description 34
- -1 polyethylene Polymers 0.000 title claims abstract description 34
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 34
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 239000010410 layer Substances 0.000 claims abstract description 70
- 229920001179 medium density polyethylene Polymers 0.000 claims abstract description 62
- 239000004701 medium-density polyethylene Substances 0.000 claims abstract description 62
- 239000012792 core layer Substances 0.000 claims abstract description 39
- 238000005266 casting Methods 0.000 claims abstract description 32
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 28
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 28
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 19
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 19
- 230000001050 lubricating effect Effects 0.000 claims abstract description 13
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 12
- 239000012793 heat-sealing layer Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims description 41
- 238000001816 cooling Methods 0.000 claims description 23
- 238000005496 tempering Methods 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 16
- 238000003851 corona treatment Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 15
- 229920006233 biaxially oriented polyamide Polymers 0.000 claims description 11
- 238000013329 compounding Methods 0.000 claims description 10
- 238000001125 extrusion Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000010008 shearing Methods 0.000 claims description 5
- 238000009966 trimming Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims 1
- 238000009835 boiling Methods 0.000 abstract description 3
- 230000004888 barrier function Effects 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 abstract description 2
- 230000006353 environmental stress Effects 0.000 abstract description 2
- 238000002844 melting Methods 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract description 2
- 229920010126 Linear Low Density Polyethylene (LLDPE) Polymers 0.000 description 9
- 235000013305 food Nutrition 0.000 description 5
- 238000000465 moulding Methods 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 230000029087 digestion Effects 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 235000013601 eggs Nutrition 0.000 description 2
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 241000286209 Phasianidae Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 235000013622 meat product Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920006284 nylon film Polymers 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection 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
-
- 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
- B32B1/00—Layered products having a non-planar shape
-
- 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
- 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
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
- B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
-
- 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
-
- 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
- B32B2307/31—Heat sealable
-
- 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
- B32B2439/00—Containers; Receptacles
- B32B2439/02—Open containers
- B32B2439/06—Bags, sacks, sachets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Wrappers (AREA)
Abstract
The invention relates to a 115-DEG C-resistant polyethylene casting film, a production method thereof and a packaging bag. The corona layer is made of linear low-density polyethylene and medium-density polyethylene which are blended in a mass ratio of 4:1; the first core layer is made of linear low-density polyethylene and medium-density polyethylene which are blended in a mass ratio of 7:3; the second core layer is made of linear low-density polyethylene and medium-density polyethylene which are mixed together in a mass ratio of 7:3; the heat sealing layer is made of low-density polyethylene, medium-density polyethylene and lubricating master batch, wherein the mass ratio of the low-density polyethylene to the medium-density polyethylene to the lubricating master batch is 20:77:3. The thickness ratio of the corona layer, the first core layer, the second core layer and the heat-seal layer is 24:26:26:24. The first core layer and the second core layer are barrier layers, have the characteristic of environmental stress cracking resistance, and have higher melting points. Can resist 115-DEG boiling and can not cause damage, gas expansion and gas leakage.
Description
Technical Field
The invention relates to the technical field of cast film production, in particular to a 115-DEG C-steaming-resistant polyethylene cast film, a production method thereof and a packaging bag.
Background
In the market, various foods are layered endlessly in order to meet the needs of different people. But for some cooked meat products, quail eggs with juice, marinated eggs with juice and the like, high-temperature sterilization is needed to ensure the quality guarantee period of the food and the flavor and taste of the food. Through market research and customer feedback, the food packaging bag is easy to damage, expand gas, leak gas and the like in the market, and is extremely easy to cause food deterioration. The reason for this is that the package cannot withstand the temperature of the cook during the cook.
Disclosure of Invention
The invention aims to provide a 115-DEG C-resistant polyethylene casting film, which solves the problems of breakage, gas expansion and gas leakage caused by the fact that a packaging bag is not resistant to stewing in the prior art; meanwhile, the invention also aims to provide a production method of the polyethylene casting film; meanwhile, the invention also aims to provide a packaging bag made of the polyethylene casting film.
In order to achieve the above purpose, the polyethylene casting film resistant to 115-degree steaming adopts the following technical scheme: a 115-DEG C-resistant polyethylene cast film, which comprises a corona layer, a first core layer, a second core layer and a heat sealing layer;
the material of the corona layer is a blend of linear low-density polyethylene and medium-density polyethylene, and the mass ratio of the linear low-density polyethylene to the medium-density polyethylene is 4:1; the material of the first core layer is a blend of linear low-density polyethylene and medium-density polyethylene, and the mass ratio of the linear low-density polyethylene to the medium-density polyethylene is 7:3; the material of the second core layer is a blend of linear low-density polyethylene and medium-density polyethylene, and the mass ratio of the linear low-density polyethylene to the medium-density polyethylene is 7:3; the heat sealing layer is made of low-density polyethylene, medium-density polyethylene and lubricating master batch, wherein the mass ratio of the low-density polyethylene to the medium-density polyethylene to the lubricating master batch is 20:77:3;
the thickness ratio of the corona layer, the first core layer, the second core layer and the heat-seal layer is 24:26:26:24.
The production method of the polyethylene casting film adopts the following technical scheme: the production method of the polyethylene casting film comprises the following steps:
1) Preparing and weighing raw materials: preparing raw material particles according to components of a four-layer structure of the casting film, and respectively feeding the raw material particles into corresponding hoppers through a suction device and a weighing device;
2) Shearing and heating by an extruder: the four extruders respectively shear and heat the raw material particles in the feed hopper to obtain raw materials in a molten state, and the raw materials are sent to a four-layer distributor;
3) Four-layer distributor: distributing the raw materials in a molten state obtained by the four extruders in the step 2) to form a four-layer product structure with technological requirements;
4) T-shaped die extrusion cooling: extruding and fusing four layers of molten raw materials at an extrusion port of a T-shaped die, and cooling and molding;
5) On-line side thickness: measuring the total thickness of the film and the thickness of each layer, and feeding back to a control system;
6) Corona treatment: corona treatment is carried out on the film by adopting a corona machine, so that the film has certain surface tension;
7) Tempering: tempering the film subjected to corona treatment in the step 6);
8) Trimming: on-line slitting according to different width requirements;
9) And (3) rolling: and (3) curling the film cut in the step (8) into a coil.
The production method of a polyethylene cast film according to claim 2, wherein the heating temperature in each of the four extruders in step 2) is 185 to 240 ℃.
In step 4), a cooling roller is used, and the temperature of the cooling roller is 34 ℃.
The tempering temperature in step 7) is 35 ℃, and the film moving speed in the tempering process is 50m/min.
The packaging bag made of the polyethylene casting film adopts the following technical scheme: a packaging bag made of the polyethylene casting film, wherein the casting film with the four-layer structure of claim 1 and the BOPA are made into the packaging bag by adopting dry type compounding or solvent-free compounding, and the thickness ratio of the casting film with the four-layer structure and the BOPA is 65:12-120:12.
The invention has the beneficial effects that: the first core layer and the second core layer are barrier layers, the corona layer and the two core layers are both made of mixed raw materials of linear low-density polyethylene and medium-density polyethylene, so that each layer has the characteristics of environmental stress cracking resistance and long-term strength retention, and has a high melting point, and the heat sealing layer is made of a mixture of the low-density polyethylene, the medium-density polyethylene and a lubricating master batch, so that the heat sealing layer has a good heat sealing function, and the surface of the film has a lubricating effect. The polyethylene casting film can resist 115-DEG boiling and can not cause the problems of damage, gas expansion and gas leakage.
Drawings
FIG. 1 is a schematic view of the structure of one embodiment of a 115 degree retort resistant polyethylene cast film of the present invention.
Detailed Description
Example 1
The 115-degree retort resistant polyethylene cast film of this example includes a corona layer, a first core layer, a second core layer, and a heat seal layer. Wherein the material of the corona layer is a blend of Linear Low Density Polyethylene (LLDPE) and Medium Density Polyethylene (MDPE), and the mass ratio of the LLDPE to the MDPE is 4:1; the material of the first core layer is a blend of Linear Low Density Polyethylene (LLDPE) and Medium Density Polyethylene (MDPE), and the mass ratio of the LLDPE to the MDPE is 7:3; the material of the second core layer is a blend of Linear Low Density Polyethylene (LLDPE) and Medium Density Polyethylene (MDPE), and the mass ratio of the LLDPE to the MDPE is 7:3; the heat sealing layer is made of low-density polyethylene (LDPE) and medium-density polyethylene (MDPE) which are blended with lubricating master batch (F005), and the mass ratio of the LDPE to the MDPE to the F005 is 20:77:3. The thickness of the corona layer, the first core layer, the second core layer and the heat seal layer were 24%, 26% and 24%, respectively.
The production method of the polyethylene casting film resistant to the 115-DEG C digestion of the embodiment comprises the following steps:
1) Preparing and weighing raw materials: preparing raw material particles according to components of a four-layer structure of the casting film, and respectively feeding the raw material particles into corresponding hoppers through a suction device and a weighing device;
2) Shearing and heating by an extruder: the four extruders respectively shear and heat the raw material particles in the feed hopper to obtain raw materials in a molten state, and the raw materials are sent to a four-layer distributor; the heating temperature in each of the four extruders was 185 ℃.
3) Four-layer distributor: distributing the raw materials in a molten state obtained by the four extruders in the step 2) to form a four-layer product structure with technological requirements;
4) T-shaped die extrusion cooling: extruding and fusing four layers of molten raw materials at an extrusion port of a T-shaped die, and cooling and molding; the cooling mode adopts a cooling roller, and the temperature of the cooling roller is 34 ℃.
5) On-line side thickness: measuring the total thickness of the film and the thickness of each layer, and feeding back to a control system;
6) Corona treatment: corona treatment is carried out on the film by adopting a corona machine, so that the film has certain surface tension;
7) Tempering: tempering the film subjected to corona treatment in the step 6); the tempering temperature is 35 ℃, and the moving speed of the film in the tempering process is 50m/min (meters/min).
8) Trimming: on-line slitting according to different width requirements;
9) And (3) rolling: and (3) curling the film cut in the step (8) into a coil.
In this embodiment, the packaging bag made of the polyethylene casting film is manufactured by adopting dry-type compounding or solvent-free compounding of the casting film with the four-layer structure and BOPA, wherein the thickness of the casting film with the four-layer structure is 65 micrometers, and the thickness of the BOPA is 12 micrometers.
Example two
The 115-degree retort resistant polyethylene cast film of this example includes a corona layer, a first core layer, a second core layer, and a heat seal layer. Wherein the material of the corona layer is a blend of Linear Low Density Polyethylene (LLDPE) and Medium Density Polyethylene (MDPE), and the mass ratio of the LLDPE to the MDPE is 4:1; the material of the first core layer is a blend of Linear Low Density Polyethylene (LLDPE) and Medium Density Polyethylene (MDPE), and the mass ratio of the LLDPE to the MDPE is 7:3; the material of the second core layer is a blend of Linear Low Density Polyethylene (LLDPE) and Medium Density Polyethylene (MDPE), and the mass ratio of the LLDPE to the MDPE is 7:3; the heat sealing layer is made of low-density polyethylene (LDPE) and medium-density polyethylene (MDPE) which are blended with lubricating master batch (F005), and the mass ratio of the LDPE to the MDPE to the F005 is 20:77:3. The thickness of the corona layer, the first core layer, the second core layer and the heat seal layer were 24%, 26% and 24%, respectively.
The production method of the polyethylene casting film resistant to the 115-DEG C digestion of the embodiment comprises the following steps:
1) Preparing and weighing raw materials: preparing raw material particles according to components of a four-layer structure of the casting film, and respectively feeding the raw material particles into corresponding hoppers through a suction device and a weighing device;
2) Shearing and heating by an extruder: the four extruders respectively shear and heat the raw material particles in the feed hopper to obtain raw materials in a molten state, and the raw materials are sent to a four-layer distributor; the heating temperature in each of the four extruders was 240 ℃.
3) Four-layer distributor: distributing the raw materials in a molten state obtained by the four extruders in the step 2) to form a four-layer product structure with technological requirements;
4) T-shaped die extrusion cooling: extruding and fusing four layers of molten raw materials at an extrusion port of a T-shaped die, and cooling and molding; the cooling mode adopts a cooling roller, and the temperature of the cooling roller is 34 ℃.
5) On-line side thickness: measuring the total thickness of the film and the thickness of each layer, and feeding back to a control system;
6) Corona treatment: corona treatment is carried out on the film by adopting a corona machine, so that the film has certain surface tension;
7) Tempering: tempering the film subjected to corona treatment in the step 6); the tempering temperature is 35 ℃, and the moving speed of the film in the tempering process is 50m/min (meters/min).
8) Trimming: on-line slitting according to different width requirements;
9) And (3) rolling: and (3) curling the film cut in the step (8) into a coil.
In this embodiment, the packaging bag made of the polyethylene casting film is manufactured by adopting dry-type compounding or solvent-free compounding of the casting film with the four-layer structure and BOPA, wherein the thickness of the casting film with the four-layer structure is 120 micrometers, and the thickness of the BOPA is 12 micrometers.
Example 3
The 115-degree retort resistant polyethylene cast film of this example includes a corona layer, a first core layer, a second core layer, and a heat seal layer. Wherein the material of the corona layer is a blend of Linear Low Density Polyethylene (LLDPE) and Medium Density Polyethylene (MDPE), and the mass ratio of the LLDPE to the MDPE is 4:1; the material of the first core layer is a blend of Linear Low Density Polyethylene (LLDPE) and Medium Density Polyethylene (MDPE), and the mass ratio of the LLDPE to the MDPE is 7:3; the material of the second core layer is a blend of Linear Low Density Polyethylene (LLDPE) and Medium Density Polyethylene (MDPE), and the mass ratio of the LLDPE to the MDPE is 7:3; the heat sealing layer is made of low-density polyethylene (LDPE) and medium-density polyethylene (MDPE) which are blended with lubricating master batch (F005), and the mass ratio of the LDPE to the MDPE to the F005 is 20:77:3. The thickness of the corona layer, the first core layer, the second core layer and the heat seal layer were 24%, 26% and 24%, respectively.
The production method of the polyethylene casting film resistant to the 115-DEG C digestion of the embodiment comprises the following steps:
1) Preparing and weighing raw materials: preparing raw material particles according to components of a four-layer structure of the casting film, and respectively feeding the raw material particles into corresponding hoppers through a suction device and a weighing device;
2) Shearing and heating by an extruder: the four extruders respectively shear and heat the raw material particles in the feed hopper to obtain raw materials in a molten state, and the raw materials are sent to a four-layer distributor; the heating temperature in each of the four extruders was 205 ℃.
3) Four-layer distributor: distributing the raw materials in a molten state obtained by the four extruders in the step 2) to form a four-layer product structure with technological requirements;
4) T-shaped die extrusion cooling: extruding and fusing four layers of molten raw materials at an extrusion port of a T-shaped die, and cooling and molding; the cooling mode adopts a cooling roller, and the temperature of the cooling roller is 34 ℃.
5) On-line side thickness: measuring the total thickness of the film and the thickness of each layer, and feeding back to a control system;
6) Corona treatment: corona treatment is carried out on the film by adopting a corona machine, so that the film has certain surface tension;
7) Tempering: tempering the film subjected to corona treatment in the step 6); the tempering temperature is 35 ℃, and the moving speed of the film in the tempering process is 50m/min (meters/min).
8) Trimming: on-line slitting according to different width requirements;
9) And (3) rolling: and (3) curling the film cut in the step (8) into a coil.
In this embodiment, the packaging bag made of the polyethylene casting film is manufactured by adopting dry-type compounding or solvent-free compounding of the casting film with the four-layer structure and BOPA, wherein the thickness of the casting film with the four-layer structure is 85 micrometers, and the thickness of the BOPA is 12 micrometers.
The lubricating masterbatch of each of the above examples was a lubricating masterbatch of the brand F005 manufactured by Dongguan Shulman plastics Co. After the additive, the surface of the film is lubricated, so that the packaging bag can be opened smoothly. LLDPE is a short for linear low density polyethylene, which is a polyethylene plastic particle and has the international common name: LLDPE we use the brand of Katal Q2018N. MDPE is short for medium density polyethylene, is also polyethylene plastic particles, and is called as international common name: MDPE, which we used, was designated M6040 by Korea dall. LDPE is short for low density polyethylene, is also a polyethylene plastic particle, and is called as the international common name: LDPE, we use Iran produced under the designation 2420E02.
The package in each of the above examples had low haze (< 15%); the steam resistance performance is excellent, and the phenomena of adhesion, bag breaking, gas expansion and gas leakage are avoided after the steam is boiled for 45 minutes at 115 ℃ in a laboratory back pressure steam boiler test; good drop performance (1.5 m height drop 6 times). The packaging bag can resist boiling at 115 ℃ due to the effect of the casting film. BOPA is a packaging film commonly used in the prior art, and is a short name of biaxially oriented nylon film.
It will be apparent to those skilled in the art from this disclosure that various other changes and modifications can be made which are within the scope of the invention as defined in the appended claims.
Claims (6)
1. A 115 degree retort resistant polyethylene cast film characterized by: comprises a corona layer, a first core layer, a second core layer and a heat sealing layer;
the material of the corona layer is a blend of linear low-density polyethylene and medium-density polyethylene, and the mass ratio of the linear low-density polyethylene to the medium-density polyethylene is 4:1; the material of the first core layer is a blend of linear low-density polyethylene and medium-density polyethylene, and the mass ratio of the linear low-density polyethylene to the medium-density polyethylene is 7:3; the material of the second core layer is a blend of linear low-density polyethylene and medium-density polyethylene, and the mass ratio of the linear low-density polyethylene to the medium-density polyethylene is 7:3; the heat sealing layer is made of low-density polyethylene, medium-density polyethylene and lubricating master batch, wherein the mass ratio of the low-density polyethylene to the medium-density polyethylene to the lubricating master batch is 20:77:3;
the thickness ratio of the corona layer, the first core layer, the second core layer and the heat-seal layer is 24:26:26:24.
2. A method for producing a polyethylene cast film as claimed in claim 1, comprising the steps of:
1) Preparing and weighing raw materials: preparing raw material particles according to components of a four-layer structure of the casting film, and respectively feeding the raw material particles into corresponding hoppers through a suction device and a weighing device;
2) Shearing and heating by an extruder: the four extruders respectively shear and heat the raw material particles in the feed hopper to obtain raw materials in a molten state, and the raw materials are sent to a four-layer distributor;
3) Four-layer distributor: distributing the raw materials in a molten state obtained by the four extruders in the step 2) to form a four-layer product structure with technological requirements;
4) Extrusion cooling of the T-shaped die: extruding and fusing four layers of molten raw materials at an extrusion outlet of a T-shaped die head, and cooling and forming;
5) And (3) online thickness measurement: measuring the total thickness of the film and the thickness of each layer, and feeding back to a control system;
6) Corona treatment: corona treatment is carried out on the film by adopting a corona machine, so that the film has certain surface tension;
7) Tempering: tempering the film subjected to corona treatment in the step 6);
8) Trimming: on-line slitting according to different width requirements;
9) And (3) rolling: and (3) curling the film cut in the step (8) into a coil.
3. The production method of a polyethylene cast film according to claim 2, characterized in that: the heating temperature in the four extruders in step 2) was 185-240 ℃.
4. The production method of a polyethylene cast film according to claim 2, characterized in that: in step 4), a cooling roller is used, and the temperature of the cooling roller is 34 ℃.
5. The production method of a polyethylene cast film according to claim 2, characterized in that: the tempering temperature in step 7) is 35 ℃, and the film moving speed in the tempering process is 50m/min.
6. A packaging bag made using the polyethylene cast film of claim 1, characterized in that: packaging bag prepared by dry compounding or solvent-free compounding the casting film with BOPA in the four-layer structure according to claim 1, wherein the thickness ratio of the casting film with the four-layer structure to the BOPA is 65:12-120:12.
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| CN112477347B true CN112477347B (en) | 2023-08-08 |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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