CN111688325B - Preparation method of aluminum-plastic composite film - Google Patents
Preparation method of aluminum-plastic composite film Download PDFInfo
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- CN111688325B CN111688325B CN202010613602.XA CN202010613602A CN111688325B CN 111688325 B CN111688325 B CN 111688325B CN 202010613602 A CN202010613602 A CN 202010613602A CN 111688325 B CN111688325 B CN 111688325B
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- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
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- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
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- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
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Abstract
The invention provides a preparation method of an aluminum-plastic composite film, and the prepared product has stable performance, enhanced chemical resistance, increased peel strength and reduced curing time of traditional dry compounding; secondly, the production process of the aluminum-plastic composite film does not need curing, the requirement on equipment is greatly reduced, the product defects caused by the curing process are reduced, the stability of batch production is improved, the processing speed is obviously improved compared with that of a dry process, and the production efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of composite films, and particularly relates to a preparation method of an aluminum-plastic composite film.
Background
The preparation method of the traditional aluminum-plastic film black film comprises the following steps: (1) performing anticorrosive coating treatment on the aluminum-plastic film; (2) compounding a cast polypropylene film heat-seal layer with an aluminum foil layer (at present, two compounding processes are dry compounding and thermal compounding) to obtain an aluminum foil layer-heat-seal layer composite semi-finished product; (3) sending the nylon outer-layer protective layer from the unwinding mechanism I to the coating mechanism, and coating glue on the surface of the nylon outer-layer protective layer; the semi-finished product is compounded with the aluminum foil layer-heat sealing layer composite semi-finished product sent from the unreeling mechanism at high temperature and high pressure by a heating reaction at the temperature of 50-120 ℃ in an oven, and the semi-finished product is obtained after reaching a reeling mechanism; the coating liquid is composed of one or two of polyalcohol, acetylacetone and polyisocyanate as main agents (usually, the combination of polyalcohol and polyisocyanate is more, the process is mature, the processing process is stable, the mass ratio of the polyalcohol to the polyisocyanate is usually 3.5-5% and 1-2%), ethyl acetate and toluene are used as solvents, the heating time is usually 5-10 seconds, the temperature of a composite roller of a composite part is 60 ℃, and the composite pressure is 0.3-0.45 MPa; (4) curing: the curing time is generally different from 4 to 10 days, and the polyurethane adhesive formed by the reaction of the polyol and the isocyanate is crosslinked again to strengthen the adhesive force; curing temperature is 40-80 ℃; (5) and (5) performing smooth surface treatment. Therefore, the outer layer compounding process of the existing aluminum-plastic composite film is mainly a dry-method sizing compounding process, and the dry-method sizing compounding process mainly refers to the process for manufacturing the aluminum-plastic film, wherein the compounding process between the outer layer and the aluminum foil layer uses the traditional dry-method sizing compounding process; however, the dry compounding process generally requires an unequal curing time of 4-9 days due to the use of two-component glue, and has the disadvantages of long processing time, low bonding strength and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of an aluminum-plastic composite film.
In order to solve the technical problems, the invention provides a preparation method of an aluminum-plastic composite film, which comprises the following steps:
(1) deoiling and cleaning an aluminum foil layer: degreasing and cleaning 25-65 μm aluminum foil with alkaline degreasing agent, and drying to obtain clean aluminum foil;
(2) and (3) anticorrosive treatment of the aluminum foil layer: coating an anti-corrosion treatment agent on the bright surface and the matte surface of the clean aluminum foil by using a coating production line, so that the upper surface and the lower surface of an aluminum foil layer formed by the clean aluminum foil are respectively provided with a film with the thickness of 200nm-1 mu m, and drying by using an oven to obtain an anti-corrosion aluminum foil layer;
(3) and (3) spraying and reprocessing the polypropylene heat-sealing layer: extruding a heat-sealing material by using a screw extruder of a first spraying and repeating mechanism, extruding the heat-sealing material from a die head of the screw extruder, and then spraying a film to a bright surface of the anti-corrosion aluminum foil layer to form an aluminum foil layer-heat-sealing layer composite semi-finished product;
(4) performing primary coating treatment on the matte surface of the anticorrosion aluminum foil layer: putting the aluminum foil layer-heat sealing layer composite semi-finished product into a micro-concave coating mechanism, and coating the matte surface of the anti-corrosion aluminum foil layer with glue;
(5) outer layer laminating composite treatment: extruding the outer layer material by using a screw extruder of a second spraying and repeating mechanism, extruding the material from a die head of the screw extruder, spraying a film to a matte surface of the anticorrosive aluminum foil layer, cooling the material by using a first cooling roller to form an outer layer-aluminum foil layer-heat sealing layer primary composite semi-finished product, continuously performing secondary heating, melting and pressing on the outer layer-aluminum foil layer-heat sealing layer primary composite semi-finished product, and cooling the composite semi-finished product by using a second cooling roller to obtain an outer layer-aluminum foil layer-heat sealing layer composite semi-finished product;
(6) smooth coating treatment: and sending the outer-layer-aluminum foil layer-heat sealing layer composite semi-finished product to a smooth coating mechanism, and coating the outer-layer-aluminum foil layer-heat sealing layer composite semi-finished product by using a gravure roller to obtain an aluminum-plastic composite film finished product.
As a preferable scheme of the preparation method of the aluminum-plastic composite film, in the step (1), the alkaline degreasing agent contains a metal surfactant and a builder, the metal surfactant is selected from any one of nonylphenol polyoxyethylene ether, polyoxyethylene octylphenol ether and triethanolamine oleate soap, the builder is sodium tripolyphosphate, the mass percent of the metal surfactant is 16% -22%, and the mass percent of the builder is 8% -15%.
As a preferable scheme of the preparation method of the aluminum-plastic composite film, the production running speed of the coating production line in the step (2) is 50m/min-120m/min, the anticorrosion treatment agent is trivalent chromium or trivalent cesium atoms, the heating temperature of the oven is 80-280 ℃, and the heating time is 2-4 s.
As a preferable scheme of the preparation method of the aluminum-plastic composite film, the heat-sealing material in the step (3) is any one of graft modified polypropylene granules, graft modified polyethylene granules and acid modified polypropylene, the heating temperature of the screw extruder is 180-280 ℃, the extrusion pressure is 20MPa, the thickness of the heat-sealing material extruded from a die head of the screw extruder is 20-100 mu m, the laminating composite pressure is 0.15-0.40 MPa, and the whole production running speed of the polypropylene heat-sealing layer laminating step is 50-80 m/min.
As a preferable scheme of the preparation method of the aluminum-plastic composite film, in the step (4), the coating liquid used for sizing coating includes an adhesive and a solvent, the adhesive is any one of water-soluble acrylic resin, water-soluble epoxy resin or water-soluble polyurethane resin, the solvent is a mixed solution of water and methanol, and the methanol: water: the mass ratio of the adhesive is 37: 10: 3; the temperature of the drying oven in the sizing coating is 150-280 ℃, the heating time is 1-1.5s, the thickness of the sizing is 0.5-0.8 mu m, and the production speed of the step of the primary coating treatment of the matte surface of the anti-corrosion aluminum foil layer is 50-120 m/min.
As a preferable scheme of the preparation method of the aluminum-plastic composite film, in the step (5), the heating temperature of the screw extruder is 260-330 ℃, the extrusion pressure is 50-200 Mpa, the thickness of the outer layer material extruded from a die head of the screw extruder is 25-100 mu m, the cooling temperature of the first cooling roller is 12-35 ℃, and the cooling time is 0.5-0.8 s.
As a preferable scheme of the preparation method of the aluminum-plastic composite film, in the step (5), the heating temperature of the first heating roller for secondary heating, melting and pressing is 75-85 ℃, the heating temperature of the second heating roller is 130-145 ℃, the heating temperature of the third heating roller is 150-180 ℃, the diameters of the first heating roller, the second heating roller and the third heating roller are all 800mm, the pressing pressure is 0.15-0.25 MPa, the cooling temperature of the second cooling roller is 15-35 ℃, and the diameter of the second cooling roller is 600 mm.
As a preferable scheme of the preparation method of the aluminum-plastic composite membrane, in the step (5), the material of the outer layer is any one or more of polyamide 6, polyethylene terephthalate and thermoplastic polyurethane elastomer, the thickness of the outer layer material is 20-50 μm, the second spraying and repeating mechanism adopts a three-layer co-extrusion extruder, wherein the heating temperature of the first extruder is 280-330 ℃, the internal pressure of the first extruder is 150-220 Mpa, the heating temperature of the second extruder is 270-315 ℃, the pressure in the second extruder is 100-180 MPa, the heating temperature of the third extruder is 260-300 ℃, the internal pressure of the third extruder is 110-150 MPa, the composite pressure is 0.55-0.65 MPa, the production speed of the outer layer laminating composite treatment step is 20-80 m/min.
As a preferable embodiment of the method for preparing an aluminum-plastic composite film according to the present invention, in step (5), the raw material in the first extruder is polyethylene terephthalate, the raw material in the second extruder is polyamide 6, and the raw material in the third extruder is polyamide 6 and a thermoplastic polyurethane elastomer, wherein a mass ratio of the polyamide 6 to the thermoplastic polyurethane elastomer is 5: 1, wherein the extrusion layer thickness ratio of the first extruder, the second extruder and the third extruder is 1: 2: 1.
as a preferred scheme of the preparation method of the aluminum-plastic composite film, the coating liquid in the coating treatment in the step (6) comprises erucamide and chlorinated modified polypropylene, the solvent is ethyl acetate, 0.2-0.3 part of erucamide and 0.005 part of chlorinated modified polypropylene are added into 100 parts of ethyl acetate by weight, the temperature of the oven is 45-55 ℃, and the production speed of the smooth coating treatment step is 50-120 m/min.
Compared with the prior aluminum-plastic film technology, the preparation method of the aluminum-plastic composite film provided by the invention has the advantages that: the method uses an outer layer thermal compounding process different from the traditional gluing compounding process to directly bond the outer layer of the aluminum-plastic film and the aluminum foil without using an adhesive, and the outer layer of the aluminum-plastic film is attached to the surface of the aluminum foil after the material is melted.
Detailed Description
The invention relates to an aluminum-plastic composite film, which comprises a cast polypropylene film layer, an aluminum foil layer and an outer protective layer which are sequentially arranged; the cast polypropylene film layer, the aluminum foil layer and the outer protection layer are compounded by heating and pressurizing; the outer protective layer is compounded by a hot co-extrusion process.
The present invention will be described in further detail with reference to specific embodiments in order to make the above objects, features and advantages more apparent and understandable.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The invention relates to a novel aluminum-plastic composite film, and the processing method comprises the following specific operation steps:
(1) deoiling of the aluminum foil layer: degreasing and cleaning 25-65 mu m of cold-rolled technical aluminum foil by using an alkaline degreasing agent, and drying for later use; the main components of the alkaline oil remover are metal surfactant (one of nonylphenol polyoxyethylene ether, polyoxyethylene octylphenol ether and triethanolamine oleate soap) and builder (sodium tripolyphosphate), the combination of the nonylphenol polyoxyethylene ether and the sodium tripolyphosphate is generally selected, the cleaning effect can be obviously improved, the mass percentages are respectively 16% -22% and 8% -15%,
(2) and (3) performing anticorrosive treatment operation on the aluminum foil layer: sending the aluminum foil layer from the unreeling mechanism to the coating mechanism, coating an anti-corrosion treatment agent on the bright surface and the matte surface of the deoiled and dried aluminum foil by using a coating production line to form a film with the surface thickness of 200nm-1 mu m, heating the film in an oven at the temperature of 80-280 ℃ for reaction and drying for 2-4s, and then rolling the film for later use. The production running speed of the coating production line is 50-120 m/min; the corrosion-resistant treating agent is generally subjected to oxidation treatment by trivalent chromium or trivalent cesium atoms, and trivalent cesium is recommended to be used, so that compared with a trivalent chromium oxidation product, the corrosion-resistant treating agent is non-toxic and environment-friendly;
(3) and (3) spraying and repeating the polypropylene heat-sealing layer: sending the aluminum foil layer from the unwinding mechanism to the laminating mechanism, extruding the heat-sealing material by using a screw extruder of the laminating mechanism, extruding the heat-sealing material from a die head of the screw extruder, and laminating the film to the bright surface of the aluminum foil layer to form an aluminum foil layer-heat-sealing layer composite semi-finished product; the heat-sealing material is any one of graft modified polypropylene granules, graft modified polyethylene granules and acid modified polypropylene, the heating temperature of a screw extruder is 180-280 ℃, the extrusion pressure is 20Mpa, the thickness of the heat-sealing material extruded from a die head of the screw extruder is 20-100 mu m, the composite pressure is 0.15-0.40 Mpa, and the production running speed is 50-80 m/min;
(4) and (3) carrying out primary coating treatment on the matte surface of the aluminum foil: putting the aluminum foil layer-heat sealing layer composite semi-finished product into a micro-concave coating mechanism, and gluing and coating the matte surface of the anti-corrosion aluminum foil layer; the coating liquid comprises an adhesive and a solvent, and has the effect of improving the spraying and recovering effect. The adhesive is prepared from one of water-soluble acrylic resin, water-soluble epoxy resin or water-soluble polyurethane resin, preferably water-soluble acrylic resin, and has the advantages of short relative reaction time and relatively low price, and the solvent is a mixed solution of water and methanol, methanol: water: the mass ratio of the adhesive is 37: 10: 3, the temperature of the oven is 150-280 ℃, the heating time is 1-1.5s, the gluing thickness is 0.5-0.8 μm, the production speed is 50-120 m/min, and the procedure does not need curing;
(5) outer layer laminating composite treatment: sending the aluminum foil layer-heat sealing layer composite semi-finished product from the unreeling mechanism to the laminating mechanism, extruding the outer layer material by using a screw extruder of the laminating mechanism, extruding the outer layer material from a die head of the screw extruder, laminating the film to a matte surface of the anticorrosive aluminum foil layer, heating the screw extruder to 260-330 ℃, extruding the outer layer material to 50-200 Mpa, extruding the outer layer material from the die head of the screw extruder to 25-100 mu m in thickness, cooling the outer layer material by using a composite cooling roller to form an outer layer-aluminum foil layer-heat sealing layer composite primary composite semi-finished product, wherein the temperature of the cooling roller is 12-35 ℃, the cooling time is 0.5-0.8s, and the primary composite peeling strength is 8-10N/15 mm.
The semi-finished product after the primary compounding is continuously subjected to secondary heating, melting and pressing to enhance the stripping force, and is cooled and then wound into a winding unit for standby; the temperature of a heating roller for secondary heating is 75-85 ℃, the temperature of the heating roller is 130-145 ℃, the temperature of the heating roller is 150-180 ℃, the diameter of the heating roller is 800mm, the cooling temperature is 15-35 ℃, the diameter of the cooling roller is 600mm, and the pressing pressure is 0.15-0.25 MPa.
The spraying and repeating mechanism adopts a three-layer co-extrusion extruder, the outer layer is made of one or more of polyamide 6, polyethylene glycol terephthalate and thermoplastic polyurethane elastomer, generally three materials are selected and used completely, the composite strength can be enhanced, the water vapor barrier property is improved, the moisture and heat resistance is better, the thickness of the outer layer is 20-50 mu m, and the thickness ratio of the extrusion layers of the extruder (i), the extruder (ii) and the extruder (iii) is 1: 2: 1, heating temperature of an extruder is 280-330 ℃, pressure in the extruder is 150-220 Mpa, polyethylene terephthalate is used as a raw material, heating temperature of the extruder is 270-315 ℃, pressure in the extruder is 100-180 Mpa, polyamide 6 is used as a raw material, heating temperature of the extruder is 260-300 ℃, pressure in the extruder is 110-150 Mpa, polyamide 6 and a thermoplastic polyurethane elastomer are used as raw materials, and the mass ratio of the polyamide 6 to the thermoplastic polyurethane elastomer is 5: 1, the production speed is 20m/min-80m/min, and the composite pressure is 0.55MPa-0.65 MPa;
(6) smooth coating treatment: sending the outer-layer-aluminum foil layer-heat sealing layer composite semi-finished product from the unreeling mechanism to a smooth coating mechanism, and coating the outer-layer-aluminum foil layer-heat sealing layer composite semi-finished product by using a gravure roller to obtain an aluminum plastic film finished product; the coating liquid comprises erucamide (0.2-0.3 wt.%), chlorinated modified polypropylene (0.005 wt.%), ethyl acetate as solvent, the temperature of oven is 45-55 deg.C, and the production speed is 50-120 m/min; the process does not need curing, the deep drawing performance of the aluminum plastic film is improved, the surface tension of the coating liquid can be improved by adding the chlorinated modified polypropylene (surfactant), the coating uniformity is improved, and meanwhile, the method is relatively low in cost.
For specific embodiments and comparative examples, reference is made to the following comparative examples and examples:
comparative example 1
The preparation method of the traditional aluminum-plastic composite film comprises the following steps:
(1) and (5) performing anticorrosive coating treatment on the aluminum plastic film.
(2) And compounding the cast polypropylene film heat-seal layer with the aluminum foil layer (at present, two compounding processes are dry compounding and thermal compounding) to obtain an aluminum foil layer-heat-seal layer composite semi-finished product.
(3) Sending the nylon outer-layer protective layer from the unwinding mechanism I to the coating mechanism, and coating glue on the surface of the nylon outer-layer protective layer; the semi-finished product is compounded with the aluminum foil layer-heat sealing layer composite semi-finished product sent from the unreeling mechanism at high temperature and high pressure by a heating reaction at the temperature of 50-120 ℃ in an oven, and the semi-finished product is obtained after reaching a reeling mechanism; the coating liquid consists of one or two of polyol, acetylacetone and polyisocyanate as main agent (polyol and polyisocyanate are usually combined more, the process is mature, the processing process is stable, the mass ratio of the polyol to the polyisocyanate is usually 3.5-5% and 1-2%), ethyl acetate and toluene are used as solvent, the heating time is usually 5-10 seconds, the temperature of the composite roller of the composite part is 60 ℃, and the composite pressure is 0.3-0.45 MPa.
(4) Curing: the curing time is generally different from 4 to 10 days, and the polyurethane adhesive formed by the reaction of the polyol and the isocyanate is crosslinked again to strengthen the adhesive force; the curing temperature is 40-80 ℃.
(5) And (5) performing smooth surface treatment.
Example 1
(1) Deoiling of the aluminum foil layer: degreasing and cleaning 25 mu m of cold-rolled technical aluminum foil by using an alkaline degreasing agent, and drying for later use; the alkaline degreasing agent mainly comprises the following components: 16 percent of polyoxyethylene octyl phenol ether and 15 percent of sodium tripolyphosphate;
(2) and (3) performing anticorrosive treatment operation on the aluminum foil layer: sending the aluminum foil layer from the unwinding mechanism to the coating mechanism, coating an anti-corrosion treatment agent on the bright smooth surface and the matte surface of the deoiled and dried aluminum foil by using a coating production line to form a film with the surface thickness of 200nm, heating the film by an oven at the heating temperature of 80 ℃, reacting and drying for 2s, and then winding for later use. The production running speed of the coating production line is 50 m/min; the corrosion-resistant treating agent is subjected to oxidation treatment by using trivalent chromium;
(3) and (3) spraying and repeating the polypropylene heat-sealing layer: sending the aluminum foil layer from the unwinding mechanism to the laminating mechanism, extruding the heat-sealing material by using a screw extruder of the laminating mechanism, extruding the heat-sealing material from a die head of the screw extruder, and laminating the film to the bright surface of the aluminum foil layer to form an aluminum foil layer-heat-sealing layer composite semi-finished product; the heat-sealing material is grafted modified polyethylene granules, the heating temperature of a screw extruder is 180 ℃, the extrusion pressure is 20Mpa, the thickness of the heat-sealing material extruded from a die head of the screw extruder is 20 micrometers, the composite pressure is 0.15Mpa, and the production running speed is 50 m/min;
(4) and (3) carrying out primary coating treatment on the matte surface of the aluminum foil: putting the aluminum foil layer-heat sealing layer composite semi-finished product into a micro-concave coating mechanism, and gluing and coating the matte surface of the anti-corrosion aluminum foil layer; the adhesive uses water-soluble epoxy resin, the solvent uses a mixed solution of water and methanol, and the ratio of methanol: water: the mass ratio of the adhesive is 37: 10: 3, the temperature of the oven is 150 ℃, the heating time is 1s, the gluing thickness is 0.5 mu m, and the production speed is 50 m/min;
(5) outer layer laminating composite treatment: sending the aluminum foil layer-heat sealing layer composite semi-finished product from the unreeling mechanism to the pouring mechanism, extruding the outer layer material by using a screw extruder of the pouring mechanism, extruding the outer layer material from a die head of the screw extruder, wherein the heating temperature of the screw extruder is 260 ℃, the extrusion pressure is 50Mpa, the thickness of the outer layer material extruded from the die head of the screw extruder is 25 mu m, then, the outer layer material is sprayed to the matte surface of the anticorrosive aluminum foil layer, and after being cooled by a compounding cooling roller, the outer layer-aluminum foil layer-heat sealing layer composite primary composite semi-finished product is formed, the temperature of the cooling roller is 12 ℃, the cooling time is 0.5s, and the primary composite peel strength is 8N/15 mm.
Continuously heating, melting and pressing the semi-finished product subjected to primary compounding for the second time, cooling and winding the semi-finished product to a winding unit for later use; the temperature of a heating roller for secondary heating is 75 ℃, the temperature of the heating roller is 130 ℃, the temperature of the heating roller is 150 ℃, the diameter of the heating roller is 800mm, the cooling temperature is 15 ℃, the diameter of the cooling roller is 600mm, and the pressing pressure is 0.15 Mpa. The spraying mechanism adopts a three-layer co-extrusion extruder, the thickness of the outer layer material is 20 microns, and the thickness ratio of the extrusion layers of the extruder I, the extruder II and the extruder III is 1: 2: 1, heating temperature of a first extruder is 280 ℃, pressure in the extruder is 150Mpa, raw materials are polyethylene terephthalate, heating temperature of a second extruder is 270 ℃, pressure in the extruder is 100Mpa, raw materials are polyamide 6, heating temperature of a third extruder is 260 ℃, pressure in the extruder is 110Mpa, raw materials are polyamide 6, production speed is 20m/min, and composite pressure is 0.55 Mpa;
(6) smooth coating treatment: sending the outer-layer-aluminum foil layer-heat sealing layer composite semi-finished product from the unreeling mechanism to a smooth coating mechanism, and coating the outer-layer-aluminum foil layer-heat sealing layer composite semi-finished product by using a gravure roller to obtain an aluminum plastic film finished product; the coating liquid comprises erucamide (0.2 percent by mass), chlorinated modified polypropylene (0.005 percent by mass) and ethyl acetate as a solvent, the temperature of an oven is 45 ℃, and the production speed is 50 m/min.
Example 2
(1) Deoiling of the aluminum foil layer: degreasing and cleaning 45 mu m cold-rolled technical aluminum foil by using an alkaline degreasing agent, and drying for later use; the alkaline oil removing agent mainly comprises 19 mass percent of nonylphenol polyoxyethylene ether and 11 mass percent of sodium tripolyphosphate,
(2) and (3) performing anticorrosive treatment operation on the aluminum foil layer: sending the aluminum foil layer from the unwinding mechanism to the coating mechanism, coating an anti-corrosion treatment agent on the bright smooth surface and the matte surface of the deoiled and dried aluminum foil by using a coating production line to form a film with the surface thickness of 800nm, heating the film by an oven at the temperature of 180 ℃ for reaction and drying for 3s, and then winding the film for later use. The production running speed of the coating production line is 90 m/min; the anticorrosion treating agent is generally oxidized by trivalent cesium atoms;
(3) and (3) spraying and repeating the polypropylene heat-sealing layer: sending the aluminum foil layer from the unwinding mechanism to the laminating mechanism, extruding the heat-sealing material by using a screw extruder of the laminating mechanism, extruding the heat-sealing material from a die head of the screw extruder, and laminating the film to the bright surface of the aluminum foil layer to form an aluminum foil layer-heat-sealing layer composite semi-finished product; the heat-sealing material is graft modified polypropylene granules, the heating temperature of a screw extruder is 230 ℃, the extrusion pressure is 20Mpa, the thickness of the heat-sealing material extruded from a die head of the screw extruder is 70 mu m, the composite pressure is 0.30Mpa, and the production running speed is 70 m/min;
(4) and (3) carrying out primary coating treatment on the matte surface of the aluminum foil: putting the aluminum foil layer-heat sealing layer composite semi-finished product into a micro-concave coating mechanism, and gluing and coating the matte surface of the anti-corrosion aluminum foil layer; the adhesive is one of water-soluble acrylic resin, water-soluble epoxy resin or water-soluble polyurethane resin, preferably water-soluble acrylic resin, the solvent is a mixed solution of water and methanol, and the ratio of methanol: water: the mass ratio of the adhesive is 37: 10: 3, the temperature of the oven is 220 ℃, the heating time is 1.2s, the gluing thickness is 0.7 mu m, and the production speed is 100 m/min;
(5) outer layer laminating composite treatment: sending the aluminum foil layer-heat sealing layer composite semi-finished product from the unreeling mechanism to the pouring mechanism, extruding the outer layer material by using a screw extruder of the pouring mechanism, extruding the outer layer material from a die head of the screw extruder, wherein the heating temperature of the screw extruder is 300 ℃, the extrusion pressure is 120Mpa, the thickness of the outer layer material extruded from the die head of the screw extruder is 70 mu m, then, the outer layer material is coated to the matte surface of the anticorrosive aluminum foil layer, and after being cooled by a compounding cooling roller, the outer layer-aluminum foil layer-heat sealing layer composite primary composite semi-finished product is formed, the temperature of the cooling roller is 30 ℃, the cooling time is 0.7s, and the primary composite peel strength is 9N/15 mm.
Continuously heating, melting and pressing the semi-finished product subjected to primary compounding for the second time, cooling and winding the semi-finished product to a winding unit for later use; the temperature of a heating roller for secondary heating is 80 ℃, the temperature of the heating roller is 140 ℃, the temperature of the heating roller is 170 ℃, the diameter of the heating roller is 800mm, the cooling temperature is 28 ℃, the diameter of the cooling roller is 600mm, and the pressing pressure is 0.2 Mpa. The spraying mechanism adopts a three-layer co-extrusion extruder, the thickness of the outer layer material is 40 mu m, and the thickness ratio of the extrusion layers of the extruder I, the extruder II and the extruder III is 1: 2: 1, heating temperature of an extruder is 300 ℃, internal pressure of the extruder is 190Mpa, raw materials are polyethylene terephthalate, heating temperature of the extruder is 300 ℃, internal pressure of the extruder is 150Mpa, raw materials are polyamide 6, heating temperature of the extruder is 280 ℃, internal pressure of the extruder is 140Mpa, raw materials are polyamide 6 and thermoplastic polyurethane elastomer, and the mass ratio of the polyamide 6 to the thermoplastic polyurethane elastomer is 5: 1, the production speed is 60m/min, and the composite pressure is 0.6 Mpa;
(6) smooth coating treatment: sending the outer-layer-aluminum foil layer-heat sealing layer composite semi-finished product from the unreeling mechanism to a smooth coating mechanism, and coating the outer-layer-aluminum foil layer-heat sealing layer composite semi-finished product by using a gravure roller to obtain an aluminum plastic film finished product; the coating liquid comprises erucamide (0.25% by mass), chlorinated modified polypropylene (0.005% by mass) and ethyl acetate as a solvent, the temperature of an oven is 50 ℃, and the production speed is 90 m/min.
Example 3
(1) Deoiling of the aluminum foil layer: degreasing and cleaning 65 mu m cold-rolled technical aluminum foil by using an alkaline degreasing agent, and drying for later use; the alkaline degreasing agent mainly comprises 22 mass percent of triethanolamine oleate soap and 8 mass percent of sodium tripolyphosphate;
(2) and (3) performing anticorrosive treatment operation on the aluminum foil layer: sending the aluminum foil layer from the unwinding mechanism to the coating mechanism, coating an anti-corrosion treatment agent on the bright smooth surface and the matte surface of the deoiled and dried aluminum foil by using a coating production line to form a film with the surface thickness of 1 mu m, heating the film by an oven at the heating temperature of 280 ℃ for reaction and drying for 4s, and then rolling the film for later use. The production running speed of the coating production line is 120 m/min; the corrosion-resistant treating agent is subjected to oxidation treatment by using trivalent cesium atoms;
(3) and (3) spraying and repeating the polypropylene heat-sealing layer: sending the aluminum foil layer from the unwinding mechanism to the laminating mechanism, extruding the heat-sealing material by using a screw extruder of the laminating mechanism, extruding the heat-sealing material from a die head of the screw extruder, and laminating the film to the bright surface of the aluminum foil layer to form an aluminum foil layer-heat-sealing layer composite semi-finished product; the heat-sealing material is acid modified polypropylene, the heating temperature of a screw extruder is 280 ℃, the extrusion pressure is 20Mpa, the thickness of the heat-sealing material extruded from a die head of the screw extruder is 100 micrometers, the composite pressure is 0.40Mpa, and the production running speed is 80 m/min;
(4) and (3) carrying out primary coating treatment on the matte surface of the aluminum foil: putting the aluminum foil layer-heat sealing layer composite semi-finished product into a micro-concave coating mechanism, and gluing and coating the matte surface of the anti-corrosion aluminum foil layer; the adhesive is water-soluble polyurethane resin, the solvent is a mixed solution of water and methanol, and the ratio of methanol: water: the mass ratio of the adhesive is 37: 10: 3, the temperature of the oven is 280 ℃, the heating time is 1.5s, the gluing thickness is 0.8 mu m, and the production speed is 120 m/min;
(5) outer layer laminating composite treatment: sending the aluminum foil layer-heat sealing layer composite semi-finished product from the unreeling mechanism to the pouring mechanism, extruding the outer layer material by using a screw extruder of the pouring mechanism, extruding the outer layer material from a die head of the screw extruder, wherein the heating temperature of the screw extruder is 330 ℃, the extrusion pressure is 200Mpa, the thickness of the outer layer material extruded from the die head of the screw extruder is 100 mu m, then, the outer layer material is coated to the matte surface of the anticorrosive aluminum foil layer, and after being cooled by a compounding cooling roller, the outer layer-aluminum foil layer-heat sealing layer composite primary composite semi-finished product is formed, the temperature of the cooling roller is 35 ℃, the cooling time is 0.8s, and the primary composite peel strength is 10N/15 mm.
The semi-finished product after the primary compounding is continuously subjected to secondary heating, melting and pressing, and is cooled and then wound into a winding unit for standby; the temperature of a heating roller for secondary heating is 85 ℃, the temperature of a heating roller is 145 ℃, the temperature of the heating roller is 180 ℃, the diameter of the heating roller is 800mm, the cooling temperature is 35 ℃, the diameter of a cooling roller is 600mm, and the pressing pressure is 0.25 Mpa. The spraying mechanism adopts a three-layer co-extrusion extruder, the thickness of the outer layer material is 50 microns, and the thickness ratio of the extrusion layers of the extruder I, the extruder II and the extruder III is 1: 2: 1, heating temperature of a first extruder is 330 ℃, internal pressure of the first extruder is 220Mpa, raw material is polyamide 6, heating temperature of a second extruder is 315 ℃, internal pressure of the second extruder is 180Mpa, raw material is thermoplastic polyurethane elastomer, heating temperature of the third extruder is 300 ℃, internal pressure of the third extruder is 150Mpa, raw material is polyamide 6, production speed is 80m/min, and composite pressure is 0.65 Mpa;
(6) smooth coating treatment: sending the outer-layer-aluminum foil layer-heat sealing layer composite semi-finished product from the unreeling mechanism to a smooth coating mechanism, and coating the outer-layer-aluminum foil layer-heat sealing layer composite semi-finished product by using a gravure roller to obtain an aluminum plastic film finished product; the coating liquid comprises erucamide (0.3 percent by mass), chlorinated modified polypropylene (0.005 percent by mass) and ethyl acetate as a solvent, the temperature of an oven is 55 ℃, and the production speed is 50-120 m/min.
The test results of the comparative example and the example are shown in the following table 1.
From the data in table 1, it is found that the composite strength and the chemical-resistant composite strength of the aluminum-plastic composite film prepared by the invention are obviously improved, the use cost is saved, and the safety risk of the product is reduced by comparing the examples 1, 2 and 3 of the aluminum-plastic composite film with the comparative example 1; particularly, the composite strength and the chemical resistant composite strength of the embodiment 2 have obvious advantages under the condition of environmental protection.
Therefore, the aluminum-plastic composite film prepared by the method has stable product performance, enhanced chemical resistance, increased peel strength and shortened curing time of the traditional dry-method composite; secondly, the production process of the aluminum-plastic composite film does not need curing, the requirement on equipment is greatly reduced, the product defects caused by the curing process are reduced, the stability of batch production is improved, the processing speed is obviously improved compared with that of a dry process, and the production efficiency is improved.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (6)
1. The preparation method of the aluminum-plastic composite film is characterized by comprising the following steps:
(1) deoiling and cleaning an aluminum foil layer: degreasing and cleaning 25-65 μm aluminum foil with alkaline degreasing agent, and drying to obtain clean aluminum foil;
(2) and (3) anticorrosive treatment of the aluminum foil layer: coating an anti-corrosion treatment agent on the bright surface and the matte surface of the clean aluminum foil by using a coating production line, so that the upper surface and the lower surface of an aluminum foil layer formed by the clean aluminum foil are respectively provided with a film with the thickness of 200nm-1 mu m, and drying by using an oven to obtain an anti-corrosion aluminum foil layer;
(3) and (3) spraying and reprocessing the polypropylene heat-sealing layer: extruding a heat-sealing material by using a screw extruder of a first spraying and repeating mechanism, extruding the heat-sealing material from a die head of the screw extruder, and then spraying a film to a bright surface of the anticorrosion aluminum foil layer to form an aluminum foil layer-heat-sealing layer composite semi-finished product;
(4) and (3) performing primary coating treatment on the matte surface of the anticorrosive aluminum foil layer: putting the aluminum foil layer-heat sealing layer composite semi-finished product into a micro-concave coating mechanism, and performing sizing coating on the matte surface of the anti-corrosion aluminum foil layer, wherein the coating liquid used for sizing coating comprises an adhesive and a solvent, the adhesive is any one of water-soluble acrylic resin, water-soluble epoxy resin or water-soluble polyurethane resin, the solvent is a mixed solution of water and methanol, and the methanol: water: the mass ratio of the adhesive is 37: 10: 3; the temperature of the drying oven in the sizing and coating is 150-280 ℃, the heating time is 1-1.5s, the thickness of the sizing is 0.5-0.8 mu m, and the production speed of the step of the primary coating treatment of the matte surface of the anti-corrosion aluminum foil layer is 50-120 m/min;
(5) outer layer laminating composite treatment: extruding outer layer materials by using a screw extruder of a second spraying mechanism, extruding the materials from a die head of the screw extruder, then spraying a film to a matte surface of the anticorrosive aluminum foil layer, cooling the film by using a first cooling roller to form an outer layer-aluminum foil layer-heat sealing layer primary composite semi-finished product, continuously carrying out secondary heating, melting and pressing on the outer layer-aluminum foil layer-heat sealing layer primary composite semi-finished product, and cooling the product by using a second cooling roller to obtain the outer layer-aluminum foil layer-heat sealing layer composite semi-finished product, wherein the heating temperature of the first heating roller for secondary heating, melting and pressing is 75-85 ℃, the heating temperature of the second heating roller is 130-145 ℃, the heating temperature of the third heating roller is 150-180 ℃, the diameters of the first heating roller, the second heating roller and the third heating roller are 800mm, and the pressing pressure is 0.15-0.25 MPa, the cooling temperature of the second cooling roller is 15-35 ℃, the diameter of the second cooling roller is 600mm, the thickness of the outer layer material is 20-50 μm, the second laminating mechanism adopts a three-layer co-extrusion extruder, wherein the heating temperature of the first extruder is 280-330 ℃, the internal pressure of the first extruder is 150-220 MPa, the heating temperature of the second extruder is 270-315 ℃, the internal pressure of the second extruder is 100-180 MPa, the heating temperature of the third extruder is 260-300 ℃, the internal pressure of the third extruder is 110-150 MPa, the composite pressure is 0.55-0.65 MPa, the production speed of the outer layer laminating composite treatment step is 20-80 m/min, the raw material in the first extruder is polyethylene terephthalate, the raw material in the second extruder is polyamide 6, the raw material in the third extruder is polyamide 6 and a thermoplastic polyurethane elastomer, wherein the mass ratio of the polyamide 6 to the thermoplastic polyurethane elastomer is 5: 1, wherein the extrusion layer thickness ratio of the first extruder, the second extruder and the third extruder is 1: 2: 1;
(6) smooth coating treatment: and sending the outer-layer-aluminum foil layer-heat sealing layer composite semi-finished product to a smooth coating mechanism, and coating the outer-layer-aluminum foil layer-heat sealing layer composite semi-finished product by using a gravure roller to obtain an aluminum-plastic composite film finished product.
2. The method for preparing the aluminum-plastic composite film according to claim 1, wherein the method comprises the following steps: the alkaline degreasing agent in the step (1) contains a metal surfactant and a builder, wherein the metal surfactant is selected from any one of nonylphenol polyoxyethylene ether, polyoxyethylene octylphenol ether and triethanolamine oleate soap, the builder is sodium tripolyphosphate, the mass percent of the metal surfactant is 16% -22%, and the mass percent of the builder is 8% -15%.
3. The method for preparing the aluminum-plastic composite film according to claim 1, wherein the method comprises the following steps: the production running speed of the coating production line in the step (2) is 50-120 m/min, the anticorrosion treating agent is selected from trivalent chromium or trivalent cesium atoms, the heating temperature of the oven is 80-280 ℃, and the heating time is 2-4 s.
4. The method for preparing the aluminum-plastic composite film according to claim 1, wherein the method comprises the following steps: the heat-sealing material in the step (3) is any one of graft modified polypropylene granules, graft modified polyethylene granules and acid modified polypropylene, the heating temperature of the screw extruder is 180-280 ℃, the extrusion pressure is 20Mpa, the thickness of the heat-sealing material extruded from a die head of the screw extruder is 20-100 μm, the laminating composite pressure is 0.15-0.40 Mpa, and the whole production operation speed of the polypropylene heat-sealing layer laminating composite treatment step is 50-80 m/min.
5. The method for preparing the aluminum-plastic composite film according to claim 1, wherein the method comprises the following steps: in the step (5), the heating temperature of the screw extruder is 260-330 ℃, the extrusion pressure is 50-200 Mpa, the thickness of the outer layer material extruded from a die head of the screw extruder is 25-100 mu m, the cooling temperature of the first cooling roller is 12-35 ℃, and the cooling time is 0.5-0.8 s.
6. The method for preparing the aluminum-plastic composite film according to claim 1, wherein the method comprises the following steps: in the step (6), the coating liquid in the coating treatment comprises erucamide and chlorinated modified polypropylene, the solvent is ethyl acetate, 0.2-0.3 part of erucamide and 0.005 part of chlorinated modified polypropylene are added into 100 parts of ethyl acetate by weight, the temperature of the oven is 45-55 ℃, and the production speed of the smooth coating treatment step is 50-120 m/min.
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