CN112895649A - Four-layer co-extrusion polyethylene cast film and production method thereof and medical packaging bag - Google Patents
Four-layer co-extrusion polyethylene cast film and production method thereof and medical packaging bag Download PDFInfo
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/49—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle
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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
- 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
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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
- 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
- B32B27/10—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 paper or cardboard
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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
- 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
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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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
- 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
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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
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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
- B32B2250/246—All polymers belonging to those covered by groups B32B27/32 and B32B27/30
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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
- B32B2307/31—Heat sealable
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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
- B32B2439/00—Containers; Receptacles
- B32B2439/80—Medical packaging
Abstract
The invention relates to a four-layer co-extrusion polyethylene cast film, a production method thereof and a medical packaging bag, wherein the four-layer co-extrusion polyethylene cast film comprises a corona layer, a first core layer, a second core layer and a heat sealing layer, the corona layer is made of linear low-density polyethylene and low-density polyethylene which are blended, and the mass ratio of the linear low-density polyethylene to the low-density polyethylene is 4: 1. The first core layer and the second core layer are both made of linear low density polyethylene. The heat sealing layer is made of resin and lubricating master batch in a blending mode, and the mass ratio of the resin to the lubricating master batch is 97: 3. The thickness ratio of the corona layer, the first core layer, the second core layer and the heat seal layer is 20:25:25: 30. The four-layer co-extrusion casting film can be compounded with BOPET and then is formed into a medical packaging bag with medical non-coated dialysis paper through hot press molding, the self-adhesive strength can reach 2.5-3.5N, the requirements can be well met, and the problem that the film in the prior art is not friendly to the environment because the film and the coated dialysis paper are matched to form a coated dialysis paper bag is solved.
Description
Technical Field
The invention relates to the technical field of cast film production, in particular to a four-layer co-extrusion polyethylene cast film, a production method thereof and a medical packaging bag.
Background
The market research finds that the medical mask and the protective clothing on the market are all made of the glue-coated dialyzing paper, and the dialyzing paper can generate waste gas and hazardous waste in the glue coating process, so that the environment-friendly medical mask and protective clothing are not friendly to the environment. Through research and development of a technical team of our department, the polyethylene cast film with affinity with the non-gummed dialysis paper is successfully developed by adopting the existing four-layer co-extrusion cast film equipment of our department, and can be self-adhered to the non-gummed dialysis paper through hot pressing, so that the polyethylene cast film has a good use prospect.
Disclosure of Invention
The invention aims to provide a four-layer co-extrusion polyethylene cast film, which solves the problem that the film in the prior art is not environment-friendly because the film is matched with gummed dialyzing paper to form a gummed dialyzing paper bag; meanwhile, the invention also aims to provide a production method of the four-layer co-extrusion polyethylene cast film; meanwhile, the invention also aims to provide a medical packaging bag made of the four-layer co-extrusion polyethylene cast film.
In order to realize the purpose, the four-layer co-extrusion polyethylene cast film adopts the following technical scheme: a four-layer co-extrusion polyethylene cast film comprises a corona layer, a first core layer, a second core layer and a heat sealing layer;
the corona layer is made of linear low-density polyethylene and low-density polyethylene in a blending mode, and the mass ratio of the linear low-density polyethylene to the low-density polyethylene is 4: 1; the first core layer is made of linear low density polyethylene; the second core layer is made of linear low density polyethylene; the heat sealing layer is made of resin and lubricating master batch in a blending mode, and the mass ratio of the resin to the lubricating master batch is 97: 3;
the thickness ratio of the corona layer, the first core layer, the second core layer and the heat seal layer is 20:25:25: 30.
The production method of the four-layer co-extrusion polyethylene cast film adopts the following technical scheme: the production method of the four-layer co-extrusion polyethylene cast film comprises the following steps:
1) preparation and weighing of raw materials: preparing raw material particles according to components of a four-layer structure of the cast film, and respectively feeding the raw material particles into corresponding feed hoppers through a material suction device and a weighing device;
2) shearing and heating by an extruder: the four extruders respectively shear and heat raw material particles in a feeding hopper of the four extruders 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 the molten state obtained by the four extruders in the step 2) to form a four-layer product structure required by the process;
4) t-shaped die head extrusion cooling: extruding and fusing the four layers of molten raw materials at an extrusion port of a T-shaped die head, and cooling and forming;
5) thickness at line side: 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: performing on-line slitting according to different width requirements;
9) winding: and (4) rolling the slit film in the step 8) into a roll.
The heating temperatures in the four extruders in step 2) were 175-260 ℃.
In the step 4), a cooling roller is adopted as a cooling mode, and the temperature of the cooling roller is 35 ℃.
The tempering temperature in the step 7) is 42 ℃, and the moving speed of the film in the tempering process is 50 m/min.
The medical packaging bag made of the four-layer co-extrusion polyethylene cast film adopts the following technical scheme: the packaging bag is prepared by the four-layer co-extrusion polyethylene cast film, and the cast film and BOPET in the four-layer structure are subjected to dry compounding or solvent-free compounding, and then are subjected to hot pressing with medical non-adhesive dialysis paper.
The invention has the beneficial effects that: the four-layer co-extrusion polyethylene cast film has good affinity with non-gumming dialysis paper, wherein the heat sealing layer is formed into a film after being blended and modified by resin and lubricating master batch, so that the heat sealing layer can quickly generate molecular structure change and is instantly bonded with the non-gumming dialysis paper under certain temperature and pressure when the non-gumming dialysis paper is subjected to hot pressing. The film meets the requirements well, and the problem that the film in the prior art is not friendly to the environment because the film is matched with the gummed dialyzing paper to form the gummed dialyzing paper bag is solved.
Drawings
FIG. 1 is a schematic structural view of one embodiment of a four layer coextruded polyethylene cast film of the present invention.
Detailed Description
Example 1
The four-layer co-extrusion polyethylene cast film comprises a corona layer 4, a first core layer 3, a second core layer 2 and a heat sealing layer 1. The corona layer is made of Linear Low Density Polyethylene (LLDPE) and Low Density Polyethylene (LDPE) which are blended, and the mass ratio of the LLDPE to the LDPE is 4: 1. The material of the first core layer is Linear Low Density Polyethylene (LLDPE). The material of the second core layer is Linear Low Density Polyethylene (LLDPE). The material of the heat-sealing layer is that resin and lubricating master batch (F005) are blended, and the mass ratio of the resin to the F005 is 97: 3. The thicknesses of the corona layer, the first core layer, the second core layer and the heat-seal layer are respectively 20%, 25% and 30%.
The production method of the four-layer co-extrusion polyethylene cast film of the embodiment comprises the following steps:
1) preparation and weighing of raw materials: preparing raw material particles according to components of a four-layer structure of the cast film, and respectively feeding the raw material particles into corresponding feed hoppers through a material suction device and a weighing device;
2) shearing and heating by an extruder: the four extruders respectively shear and heat raw material particles in a feeding hopper of the four extruders to obtain raw materials in a molten state, and the raw materials are sent to a four-layer distributor; the heating temperature in the four extruders was 175 ℃.
3) Four-layer distributor: distributing the raw materials in the molten state obtained by the four extruders in the step 2) to form a four-layer product structure required by the process;
4) t-shaped die head extrusion cooling: extruding and fusing the four layers of molten raw materials at an extrusion port of a T-shaped die head, and cooling and forming; the cooling mode adopts a cooling roller, and the temperature of the cooling roller is 35 ℃.
5) Thickness at line side: 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 was 42 ℃ and the moving speed of the film during tempering was 50 m/min.
8) Trimming: performing on-line slitting according to different width requirements;
9) winding: and (4) rolling the slit film in the step 8) into a roll.
In the embodiment, the packaging bag made of the four-layer co-extrusion polyethylene cast film is used, and the cast film with the four-layer structure is subjected to dry compounding or solvent-free compounding with BOPET and then is subjected to hot pressing with medical non-adhesive dialysis paper to form the packaging bag. The thickness of the casting film with the four-layer structure is 40 microns, and the thickness of the BOPET is 12 microns. BOPET is a commonly used packaging film in the prior art, and is a short name for biaxially oriented polyester film. The four-layer structure casting film is compounded with BOPET and then is self-adhered with the medical non-adhesive dialysis paper through hot pressing, and the self-adhesion strength can reach 2.5-3.5N.
Example two
The four-layer co-extrusion polyethylene cast film comprises a corona layer, a first core layer, a second core layer and a heat sealing layer. The corona layer is made of Linear Low Density Polyethylene (LLDPE) and Low Density Polyethylene (LDPE) which are blended, and the mass ratio of the LLDPE to the LDPE is 4: 1. The material of the first core layer is Linear Low Density Polyethylene (LLDPE). The material of the second core layer is Linear Low Density Polyethylene (LLDPE). The material of the heat-sealing layer is that resin and lubricating master batch (F005) are blended, and the mass ratio of the resin to the F005 is 97: 3. The thicknesses of the corona layer, the first core layer, the second core layer and the heat-seal layer are respectively 20%, 25% and 30%.
The production method of the four-layer co-extrusion polyethylene cast film of the embodiment comprises the following steps:
1) preparation and weighing of raw materials: preparing raw material particles according to components of a four-layer structure of the cast film, and respectively feeding the raw material particles into corresponding feed hoppers through a material suction device and a weighing device;
2) shearing and heating by an extruder: the four extruders respectively shear and heat raw material particles in a feeding hopper of the four extruders to obtain raw materials in a molten state, and the raw materials are sent to a four-layer distributor; the heating temperature in the four extruders was 260 ℃.
3) Four-layer distributor: distributing the raw materials in the molten state obtained by the four extruders in the step 2) to form a four-layer product structure required by the process;
4) t-shaped die head extrusion cooling: extruding and fusing the four layers of molten raw materials at an extrusion port of a T-shaped die head, and cooling and forming; the cooling mode adopts a cooling roller, and the temperature of the cooling roller is 35 ℃.
5) Thickness at line side: 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 was 42 ℃ and the moving speed of the film during tempering was 50 m/min.
8) Trimming: performing on-line slitting according to different width requirements;
9) winding: and (4) rolling the slit film in the step 8) into a roll.
In the embodiment, the packaging bag made of the four-layer co-extrusion polyethylene cast film is used, and the cast film with the four-layer structure is subjected to dry compounding or solvent-free compounding with BOPET and then is subjected to hot pressing with medical non-adhesive dialysis paper to form the packaging bag. The thickness of the casting film with the four-layer structure is 40 microns, and the thickness of the BOPET is 12 microns. BOPET is a commonly used packaging film in the prior art, and is a short name for biaxially oriented polyester film. The four-layer structure casting film is compounded with BOPET and then is self-adhered with the medical non-adhesive dialysis paper through hot pressing, and the self-adhesion strength can reach 2.5-3.5N.
Example 3
The four-layer co-extrusion polyethylene cast film comprises a corona layer, a first core layer, a second core layer and a heat sealing layer. The corona layer is made of Linear Low Density Polyethylene (LLDPE) and Low Density Polyethylene (LDPE) which are blended, and the mass ratio of the LLDPE to the LDPE is 4: 1. The material of the first core layer is Linear Low Density Polyethylene (LLDPE). The material of the second core layer is Linear Low Density Polyethylene (LLDPE). The material of the heat-sealing layer is that resin and lubricating master batch (F005) are blended, and the mass ratio of the resin to the F005 is 97: 3. The thicknesses of the corona layer, the first core layer, the second core layer and the heat-seal layer are respectively 20%, 25% and 30%.
The production method of the four-layer co-extrusion polyethylene cast film of the embodiment comprises the following steps:
1) preparation and weighing of raw materials: preparing raw material particles according to components of a four-layer structure of the cast film, and respectively feeding the raw material particles into corresponding feed hoppers through a material suction device and a weighing device;
2) shearing and heating by an extruder: the four extruders respectively shear and heat raw material particles in a feeding hopper of the four extruders to obtain raw materials in a molten state, and the raw materials are sent to a four-layer distributor; the heating temperature in the four extruders was 220 ℃.
3) Four-layer distributor: distributing the raw materials in the molten state obtained by the four extruders in the step 2) to form a four-layer product structure required by the process;
4) t-shaped die head extrusion cooling: extruding and fusing the four layers of molten raw materials at an extrusion port of a T-shaped die head, and cooling and forming; the cooling mode adopts a cooling roller, and the temperature of the cooling roller is 35 ℃.
5) Thickness at line side: 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 was 42 ℃ and the moving speed of the film during tempering was 50 m/min.
8) Trimming: performing on-line slitting according to different width requirements;
9) winding: and (4) rolling the slit film in the step 8) into a roll.
In the embodiment, the packaging bag made of the four-layer co-extrusion polyethylene cast film is used, the cast film with the four-layer structure and the BOPET are coated and compounded by using the adhesive glue, and then the coated and compounded cast film and the medical non-adhesive dialysis paper are subjected to hot pressing to prepare the packaging bag. The thickness of the casting film with the four-layer structure is 40 microns, and the thickness of the BOPET is 12 microns. BOPET is a commonly used packaging film in the prior art, and is a short name for biaxially oriented polyester film. The four-layer structure casting film is compounded with BOPET and then is self-adhered with the medical non-adhesive dialysis paper through hot pressing, and the self-adhesion strength can reach 2.5-3.5N.
In the above examples, the lubricating base material was made of lubricating base material having a grade of F005, which was manufactured by schumann plastic co. After the lubricating oil is added, the surface of the film can achieve a lubricating effect, so that the opening of the packaging bag can be smoothly opened. LLDPE in the corona layer is short for linear low density polyethylene, which is a polyethylene plastic particle with international common name: LLDPE, manufactured by Exxon Mobil under the designation 1002 YB. LDPE is a short for low density polyethylene, and is also a polyethylene plastic pellet, and has the international common name: LDPE is used in the trade name 100BW from Exxon Mobil. LLDPE in the first core layer and the second core layer is of 35B in China Korean petrochemical production. The resin in the heat-seal layer is made of the easy-open lid resin with the trade name of 53009, which is produced by DuPont.
The packages of the above examples had low haze (< 6%). The four-layer co-extrusion casting film can be compounded with BOPET and then is formed into a medical packaging bag with medical non-coated dialysis paper through hot press molding, the self-adhesive strength can reach 2.5-3.5N, the requirements can be well met, and the problem that the film in the prior art is not friendly to the environment because the film and the coated dialysis paper are matched to form a coated dialysis paper bag is solved.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.
Claims (6)
1. The utility model provides a four layers are crowded polyethylene curtain coating film altogether which characterized in that: the corona-resistant and heat-sealing composite material comprises a corona layer, a first core layer, a second core layer and a heat-sealing layer;
the corona layer is made of linear low-density polyethylene and low-density polyethylene in a blending mode, and the mass ratio of the linear low-density polyethylene to the low-density polyethylene is 4: 1; the first core layer is made of linear low density polyethylene; the second core layer is made of linear low density polyethylene; the heat sealing layer is made of resin and lubricating master batch in a blending mode, and the mass ratio of the resin to the lubricating master batch is 97: 3;
the thickness ratio of the corona layer, the first core layer, the second core layer and the heat seal layer is 20:25:25: 30.
2. A method for producing a four-layer coextruded polyethylene cast film according to claim 1, characterized in that it comprises the following steps:
1) preparation and weighing of raw materials: preparing raw material particles according to components of a four-layer structure of the cast film, and respectively feeding the raw material particles into corresponding feed hoppers through a material suction device and a weighing device;
2) shearing and heating by an extruder: the four extruders respectively shear and heat raw material particles in a feeding hopper of the four extruders 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 the molten state obtained by the four extruders in the step 2) to form a four-layer product structure required by the process;
4) t-shaped die head extrusion cooling: extruding and fusing the four layers of molten raw materials at an extrusion port of a T-shaped die head, and cooling and forming;
5) thickness at line side: 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: performing on-line slitting according to different width requirements;
9) winding: and (4) rolling the slit film in the step 8) into a roll.
3. A process for producing a cast polyethylene film according to claim 2, characterized in that: the heating temperatures in the four extruders in step 2) were 175-260 ℃.
4. A process for producing a cast polyethylene film according to claim 2, characterized in that: in the step 4), a cooling roller is adopted as a cooling mode, and the temperature of the cooling roller is 35 ℃.
5. A process for producing a cast polyethylene film according to claim 2, characterized in that: the tempering temperature in the step 7) is 42 ℃, and the moving speed of the film in the tempering process is 50 m/min.
6. A packaging bag made by using the cast polyethylene film according to claim 1, characterized in that: the four-layer structure casting film of claim 1 is compounded with BOPET in a dry way or without solvent, and then is hot-pressed with medical non-gummed dialysis paper to form a packaging bag.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113524845A (en) * | 2021-08-11 | 2021-10-22 | 广东骊虹包装有限公司 | Drinking water packaging film and preparation method thereof |
| CN113696576A (en) * | 2021-06-16 | 2021-11-26 | 广东骊虹包装有限公司 | Double-screw four-layer co-extrusion PE (polyethylene) single-material packaging film and preparation method thereof |
| CN117429128A (en) * | 2023-12-20 | 2024-01-23 | 杭州神彩包装印业有限公司 | Self-moisture-absorbing packaging bag and manufacturing process thereof |
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