CN114085622A - Anti-counterfeiting multilayer easy-to-tear film and preparation method thereof - Google Patents

Anti-counterfeiting multilayer easy-to-tear film and preparation method thereof Download PDF

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CN114085622A
CN114085622A CN202111215614.8A CN202111215614A CN114085622A CN 114085622 A CN114085622 A CN 114085622A CN 202111215614 A CN202111215614 A CN 202111215614A CN 114085622 A CN114085622 A CN 114085622A
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layer
easy
counterfeiting
tear film
coating
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林庆贵
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Guangdong Derui New Material Technology Co ltd
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Guangdong Derui New Material Technology Co ltd
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    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
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    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
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    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
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    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
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    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
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    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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    • C08K2201/005—Additives being defined by their particle size in general
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    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/334—Applications of adhesives in processes or use of adhesives in the form of films or foils as a label
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    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
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Abstract

The invention discloses an anti-counterfeiting multi-layer easily-torn film, which comprises a substrate layer and a coating layer which are sequentially connected; the base material layer contains a resin composition containing a polyolefin resin and inorganic powder particles; the coating layer contains a resin mixture of an acrylic resin and an additive. According to the anti-counterfeiting multilayer easy-to-tear film provided by the invention, the particle size or content is changed by using inorganic powder particles, so that the internal bonding strength or porosity of a base material layer can be adjusted, the internal bonding strength of the base material layer side is 0.4-0.8kg/cm, the internal bonding strength of the coating layer side is 0.4-2.5kg/cm, and the easy-to-tear film is easy to tear and has good directionality.

Description

Anti-counterfeiting multilayer easy-to-tear film and preparation method thereof
Technical Field
The invention relates to the technical field of anti-counterfeiting labels, in particular to an anti-counterfeiting multi-layer easy-to-tear film and a preparation method thereof.
Background
The anti-counterfeiting label is a label for anti-counterfeiting, and comprises a flat anti-counterfeiting label, a reel anti-counterfeiting label, an adhesive anti-counterfeiting label, a 315 anti-counterfeiting label, an identifier which can be adhered to the surface of a label object or a label object package, and an object attachment of the anti-counterfeiting label and has an anti-counterfeiting function.
The currently widely used anti-counterfeiting methods include the following two methods: one is that consumers can realize the true and false identification directly through naked eyes without the help of tools, and the principle of the anti-counterfeiting technology is to use a special printing technology to manufacture an anti-counterfeiting mark; and in addition, the consumption can realize the true and false identification by means of tools, and the two-dimensional code has the advantages of large storage capacity, high confidentiality, high traceability, low cost and the like.
The labels are directly adhered to the surfaces of purchased commodities in daily life, much time and energy are needed for tearing the labels at this time, the labels cannot be torn completely, and even if the labels are torn, a large amount of glue which is not easy to clean is left on the surfaces of the commodities. Therefore, how to provide an anti-counterfeiting multi-layer easy-to-tear film is a problem which needs to be solved by the technical personnel in the field.
Disclosure of Invention
The invention aims to provide an anti-counterfeiting multilayer easy-to-tear film aiming at the defects in the prior art, wherein the internal bonding strength or porosity of a base material layer can be adjusted by changing the particle size or content by using inorganic powder particles, the internal bonding strength of the base material layer side is 0.4-0.8kg/cm, and the internal bonding strength of the coating layer side is 0.4-2.5 kg/cm; when the easily tearable film is stretched in the MD direction, the substrate layer has a tensile breaking force greater than that of the coating layer, and the easily tearable film can be easily torn and has good orientation.
In order to achieve the purpose, the invention adopts the following technical scheme:
an anti-counterfeiting multilayer easy-to-tear film comprises a substrate layer and a coating layer which are sequentially connected;
the base material layer contains a resin composition containing a polyolefin resin and inorganic powder particles;
the coating layer contains a resin mixture of an acrylic resin and an additive.
Preferably, the polyolefin-based resin is one or a mixture of polypropylene, ethylene-propylene copolymer and ethylene elastomer.
Preferably, the inorganic powder particles are one or more of calcium carbonate, silica, montmorillonite and kaolin, and have a particle size of 1-15 μm.
The technical effect of adopting the technical scheme is as follows: by changing the particle diameter or content using the inorganic powder particles, the internal bonding strength or porosity of the base material layer can be adjusted.
Preferably, the substrate layer comprises a first substrate layer, a second substrate layer and a third substrate layer, wherein the first substrate layer and the third substrate layer respectively comprise the following components in percentage by weight: 5-30% of inorganic powder particles and 70-95% of polyolefin;
the second base material layer comprises the following components in percentage by weight: 50-80% of inorganic powder particles and 20-50% of polyolefin.
Preferably, the additive is selected from one or more of a mixture of optical fiber, fine particles of metal oxide, silicone, light calcium carbonate secondary agglomerates, and montmorillonite, and is used in an amount of 0.1 to 10% based on the acrylic resin. The metal oxide may comprise at least 1 metal selected from the group consisting of aluminum, zinc, tin, indium.
The technical effect of adopting the technical scheme is as follows: the anti-counterfeiting mark function is achieved by adding the optical fiber, the printing performance, the writing performance and the antistatic performance can be balanced by adding the light calcium carbonate secondary aggregate and the montmorillonite, and the anti-counterfeiting mark has excellent antistatic performance and printing performance or water resistance by adding the metal oxide particles; demolding is facilitated by the addition of silicone.
Preferably, the anti-counterfeiting multilayer easy-to-tear film further comprises an adhesive layer, and the adhesive layer is connected with the base material layer. The adhesive layer contains a (meth) acrylic copolymer, a fatty acid amide and a thermoplastic resin, and the amount ratio (10-20): (1-10): (70-80).
The technical effect of adopting the technical scheme is as follows: the addition of the (meth) acrylic copolymer can suppress the decrease in adhesion and provide a strong adhesive strength to a molded article. By using a coating layer containing an organic silicon compound, problems during label transportation can be reduced, and by mixing an adhesive layer containing a fatty acid amide and a protective layer containing silicone, not only troubles during transportation can be avoided, but also the adhesive strength of the label to a molded body can be ensured.
The thermoplastic resin is selected from olefin resins such as polypropylene resin, poly (methyl toluate) and ethylene cyclic olefin copolymer; polyester resins such as polyethylene terephthalate resins and polyethylene terephthalate resins; PO vinylchloride resin; nylon polyamide resin; polystyrene; polycarbonates, and the like.
Preferably, the anti-counterfeiting multi-layer easy-to-tear film is formed by laminating a substrate layer and a bonding layer by any one of co-extrusion molding, extrusion laminating molding and hot laminating molding.
Preferably, the anti-counterfeiting multi-layer easy-to-tear film comprises 4-7 layers; the base material layer is 3-5 layers, the thickness of each layer is 4-20 μm, the void ratio of the base material layer is 30-70%, and the coating amount of the coating layer is 0.1-25g/m2，And the coating layer is positioned on the outer side of the anti-counterfeiting multi-layer easy-to-tear film.
The invention also provides a preparation method of the anti-counterfeiting multilayer easy-to-tear film, which comprises the following steps:
s1, preparing a base material layer film by a biaxial stretching process: 20-50% of polyolefin resin and 50-80% of inorganic powder particles in percentage by weight are added into a main extruder;
adding 70-95% of polyolefin resin and 5-30% of inorganic powder particles in percentage by weight into an auxiliary extruder;
extruding the materials to a T-shaped die head for extrusion, casting a sheet, removing water on the surface of the sheet, preheating, longitudinally stretching, shaping, preheating, transversely stretching, and performing corona treatment to obtain a substrate layer film;
s2, base material layer film coating: after the substrate layer film is drawn and cooled, the substrate layer film is coated by adopting concave roll coating, wire bar coating or film coating, and then a coated product is rolled;
the coating formula is as follows: acrylic resin and additives.
Preferably, the longitudinal stretching operation is: the tension of a longitudinal drawing inlet is 180-200n, the temperature of a preheating zone of a longitudinal drawing roller is 77-79 ℃, the temperature of a stretching zone is 84-86 ℃, the temperature of a cooling zone is 24-25 ℃, a thick sheet blown out by cold blowing is threaded on the longitudinal drawing roller, the heating of an auxiliary heating device is set to be 38-40%, and the speed ratio of a fast zone and a slow zone is set to be 3.4-3.6 times.
Preferably, the operation of the transverse stretching is: setting the transverse pulling tension to 2600-.
The technical effect of adopting the technical scheme is as follows: the biaxially oriented substrate layer film has the advantages of high strength, high temperature resistance, good weather resistance and insulating property, no toxicity, corrosion resistance, flame retardance, safety and environmental protection.
Preferably, the curtain coating coats the acrylic resin and the additive on the base material layer film at a pressure of 200-250 bar.
According to the technical scheme, compared with the prior art, the invention discloses an anti-counterfeiting multi-layer easy-to-tear film which has the following technical effects:
(1) according to the anti-counterfeiting multilayer easy-to-tear film provided by the invention, the particle size or content is changed by using inorganic powder particles, so that the internal bonding strength or porosity of a base material layer can be adjusted, the internal bonding strength of the base material layer side is 0.4-0.8kg/cm, and the internal bonding strength of the coating layer side is 0.4-2.5 kg/cm; the substrate layer has a greater tensile breaking force than the coating layer when stretched in the MD direction
(2) According to the anti-counterfeiting multilayer easy-to-tear film provided by the invention, the anti-counterfeiting mark effect is achieved by adding the optical fiber, the printing performance, the writing performance and the antistatic performance can be balanced by adding the light calcium carbonate secondary aggregate and the montmorillonite, and the anti-counterfeiting multilayer easy-to-tear film has excellent antistatic property and printability or water resistance by adding the metal oxide particles; demolding is facilitated by the addition of silicone.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an anti-counterfeiting multi-layer easy-to-tear film in an embodiment of the invention.
FIG. 2 is a process flow diagram of an anti-counterfeiting multi-layer easy-to-tear film in an embodiment of the invention.
Wherein, 1 is the first substrate layer, 2 is the second substrate layer, 3 is the third substrate layer, 4 is the coating layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides an anti-counterfeiting multilayer easily-torn film, which comprises a substrate layer and a coating layer which are sequentially connected;
the base layer contains a resin composition containing a polyolefin resin and inorganic powder particles;
the coating layer contains a resin mixture of an acrylic resin and an additive.
In order to further optimize the above technical solution, the polyolefin resin is one or a mixture of polypropylene, ethylene-propylene copolymer and ethylene elastomer.
In order to further optimize the technical scheme, the inorganic powder particles are one or a mixture of more of calcium carbonate, silicon dioxide, montmorillonite and kaolin, and the particle size is 1-15 mu m.
In order to further optimize the technical scheme, the base material layer comprises three layers, wherein the first base material layer and the third base material layer comprise the following components in percentage by weight: 5-30% of inorganic powder particles and 70-95% of polyolefin;
the second base material layer comprises the following components in percentage by weight: 50-80% of inorganic powder particles and 20-50% of polyolefin.
In order to further optimize the technical scheme, the additive is selected from one or more of optical fiber, metal oxide particles, silicone, light calcium carbonate secondary aggregate and montmorillonite, and the dosage of the additive is 0.1-10% of the acrylic resin. The metal oxide may comprise at least 1 metal selected from the group consisting of aluminum, zinc, tin, indium.
In order to further optimize the technical scheme, the anti-counterfeiting multilayer easy-to-tear film further comprises an adhesive layer, and the adhesive layer is connected with the base material layer. The adhesive layer contains a (meth) acrylic copolymer, a fatty acid amide and a thermoplastic resin, and the amount ratio (10-20): (1-10): (70-80). The thermoplastic resin is selected from olefin resin such as polypropylene resin, poly methyl toluate, ethylene cyclic olefin copolymer, etc.; polyester resins such as polyethylene terephthalate resins and polyethylene terephthalate resins; PO vinylchloride resin; nylon polyamide resin; polystyrene; polycarbonates, and the like.
In order to further optimize the technical scheme, the anti-counterfeiting multi-layer easy-to-tear film is formed by laminating a base material layer and a bonding layer by any one of co-extrusion molding, extrusion laminating molding and hot laminating molding.
In order to further optimize the technical scheme, the anti-counterfeiting multilayer easy-to-tear film comprises 4-7 layers; the base material layer is 3-5 layers, the thickness of each layer is 4-20 μm, the void ratio of the base material layer is 30-70%, and the coating amount of the coating layer is 0.1-25g/m 2.
The embodiment of the invention also provides a preparation method of the anti-counterfeiting multilayer easy-to-tear film, which comprises the following steps:
s1, preparing a base material layer film by a biaxial stretching process: 20-50% of polyolefin resin and 50-80% of inorganic powder particles in percentage by weight are added into a main extruder;
adding 70-95% of polyolefin resin and 5-30% of inorganic powder particles in percentage by weight into an auxiliary extruder;
extruding the materials to a T-shaped die head for extrusion, casting a sheet, removing water on the surface of the sheet, preheating, longitudinally stretching, shaping, preheating, transversely stretching, and performing corona treatment to obtain a substrate layer film;
s2, base material layer film coating: after the substrate layer film is drawn and cooled, the substrate layer film is coated by adopting concave roll coating, wire bar coating or film coating, and then a coated product is rolled;
the coating formula is as follows: acrylic resin and additives.
In order to further optimize the above technical solution, the longitudinal stretching operation is: the tension of a longitudinal drawing inlet is 180-200n, the temperature of a preheating zone of a longitudinal drawing roller is 77-79 ℃, the temperature of a stretching zone is 84-86 ℃, the temperature of a cooling zone is 24-25 ℃, a thick sheet blown out by cold blowing is threaded on the longitudinal drawing roller, the heating of an auxiliary heating device is set to be 38-40%, and the speed ratio of a fast zone and a slow zone is set to be 3.4-3.6 times.
In order to further optimize the above technical solution, the operation of transverse stretching is: setting the transverse pulling tension to 2600-.
In order to further optimize the technical scheme, the acrylic resin and the additive are coated on the base material layer film by the curtain coating at the pressure of 200-250 bar.
Example 1
The embodiment of the invention provides an anti-counterfeiting multilayer easily-torn film, which comprises a substrate layer and a coating layer 4 which are sequentially connected, and is shown in figure 1; the base layer contains a resin composition containing a polyolefin resin and inorganic powder particles; the coating layer 4 contains a resin mixture of acrylic resin and an additive, and the anti-counterfeiting multi-layer easy-to-tear film is 4 layers; substrate layerIs 3 layers, each layer has a thickness of 4-20 μm, the base material layer has a porosity of 30-70%, and the coating amount of the coating layer 4 is 0.1-25g/m2。
Wherein the polyolefin resin is a mixture of polypropylene, ethylene-propylene copolymer and ethylene elastomer in equal proportion. The inorganic powder particles are the mixture of calcium carbonate, silicon dioxide, montmorillonite and kaolin in equal proportion, and the particle size is 1-15 μm. The substrate layer includes the three-layer, wherein, each component includes according to the weight ratio in first substrate layer 1 and the third substrate layer 3: 20% of inorganic powder particles and 80% of polyolefin; the second base material layer 2 comprises the following components in percentage by weight: 65% of inorganic powder particles and 35% of polyolefin. The additive is selected from optical fiber, metal oxide microparticles, silicone, light calcium carbonate secondary aggregate and montmorillonite, and the dosage of the additive is 0.1-10% of the acrylic resin. The metal oxide may comprise a metal selected from aluminum oxides.
In addition, the anti-counterfeiting multilayer easy-to-tear film further comprises an adhesive layer, and the adhesive layer is connected with the base material layer. The adhesive layer contains a (meth) acrylic copolymer, a fatty acid amide and a thermoplastic resin, and the amount ratio (10-20): (1-10): (70-80). The thermoplastic resin is selected from olefin resin such as polypropylene resin, poly methyl toluate, ethylene cyclic olefin copolymer, etc.; polyester resins such as polyethylene terephthalate resins and polyethylene terephthalate resins; a vinylidene chloride resin; nylon polyamide resin; polystyrene; polycarbonates, and the like.
The anti-counterfeiting multi-layer easy-to-tear film is formed by laminating a base material layer and a bonding layer by any one of co-extrusion molding, extrusion laminating molding and hot laminating molding.
The embodiment also provides a preparation method of the anti-counterfeiting multi-layer easy-to-tear film, as shown in fig. 2, the preparation method comprises the following steps:
s1, preparing a base material layer film by a biaxial stretching process: 20-50% of polyolefin resin and 50-80% of inorganic powder particles in percentage by weight are added into a main extruder;
adding 70-95% of polyolefin resin and 5-30% of inorganic powder particles in percentage by weight into an auxiliary extruder;
extruding the materials to a T-shaped die head for extrusion, casting a sheet, removing water on the surface of the sheet, preheating, longitudinally stretching, shaping, preheating, transversely stretching, and performing corona treatment to obtain a substrate layer film;
the longitudinal stretching operation is as follows: the tension of a longitudinal drawing inlet is 180-200n, the temperature of a preheating zone of a longitudinal drawing roller is 77-79 ℃, the temperature of a stretching zone is 84-86 ℃, the temperature of a cooling zone is 24-25 ℃, a thick sheet blown out by cold blowing is threaded on the longitudinal drawing roller, the heating of an auxiliary heating device is set to be 38-40%, and the speed ratio of a fast zone and a slow zone is set to be 3.4-3.6 times.
The transverse stretching operation is as follows: setting the transverse pulling tension to 2600-.
S2, base material layer film coating: after the substrate layer film is drawn and cooled, the substrate layer film is coated by adopting concave roll coating, wire bar coating or film coating, and then a coated product is rolled; the traction tension is adjusted to 1850n, the rolling tension is adjusted to 700n, the rolling speed is adjusted to 40%, and the coating formula is as follows: acrylic resin and additives.
The technical parameters in the allowable range in the above preparation method can be properly adjusted by those skilled in the art according to actual conditions.
Example 2
The preparation method and the structure are basically similar to those of the example 1, and the difference is only that: the first substrate layer 1 and the third substrate layer 3 comprise the following components in percentage by weight: 5% of inorganic powder particles and 95% of polyolefin; the second base material layer 2 comprises the following components in percentage by weight: 80% of inorganic powder particles and 20% of polyolefin.
Example 3
The preparation method and the structure are basically similar to those of the example 1, and the difference is only that: the first substrate layer 1 and the third substrate layer 3 comprise the following components in percentage by weight: 30% of inorganic powder particles and 70% of polyolefin; the second base material layer 2 comprises the following components in percentage by weight: 50% of inorganic powder particles and 50% of polyolefin.
Comparative example 1
The preparation method and the structure are basically similar to those of the example 1, and the difference is only that: the substrate layer is not added with inorganic powder particles.
To further illustrate the performance of the anti-counterfeiting multi-layer easy-tear film of the present invention, examples 1-3 and comparative example 1 were subjected to the related tests, and the test results are shown in table 1.
The test method comprises the following steps:
tear strength: with respect to the film winding direction (MD) and the direction (ID) perpendicular to the MD in the film production, the tear strength of the film was determined according to ASTTMDI1922-67 (Elmendorf test).
Linear easy tear: two cuts spaced 40mm apart from each other in parallel were formed on the side of the film, the center of the two cuts was slit by hand for 200mm, the width L (m) of the torn film was measured along a 200m tear line in the tear direction from the above-mentioned side of the film, the value of 40-L (m) was calculated, tests were conducted while setting the direction (MD) in which the film was wound in film production and The Direction (TD) perpendicular to the MD as the tear direction, and in the case where the value of 40-L was not less than-4 and not more than 4 for both MD and TD, the film was excellent in linear ease of tearing, whereas in the case where the value of 40-L was less than-4 or more than 4, the film was inferior in linear ease of tearing.
TABLE 1 results of Performance test of examples 1-3 and comparative example 1
Figure BDA0003310668750000101
From the above data, it can be seen that inventive examples 1-3 have superior linear susceptibility to crack and tear strength compared to comparative example 1. Therefore, the anti-counterfeiting multilayer easy-to-tear film provided by the invention can adjust the internal bonding strength or porosity of the substrate layer by changing the particle size or content by using the inorganic powder particles, and has the properties of easy tearing and good directionality.
The related explanation about the preparation method is that the continuous material mixing is carried out by utilizing a dead weight type static mixer in the material mixing process, all material tanks are started for material charging at the same time, the material mixing is stopped when the material mixing is abnormal, the reason is checked, the product in the period is isolated, and the production process which is most suitable for the material mixing requirement of the anti-counterfeiting multilayer easy-tearing film is realized by utilizing the dead weight type static mixer for the continuous material mixing. The ingredients are fed into a double-screw extruder, heated, plasticized, filtered and extruded, the temperature is stable for 1 hour after reaching the temperature, discharging is started, after all the materials of the system are discharged, the sheet can be cast after the discharged materials are qualified through inspection, and the low degradation and plasticizing characteristics adopted in the process are most consistent with the plasticizing requirements of anti-counterfeiting multilayer easy-to-tear films. When the melt meets the requirement, casting the melt into a proper sheet according to the requirement, and positioning a cold drum to cast the sheet, wherein the casting sheet is the key for controlling the crystallinity of the melt. And (3) putting the cold-blown thick sheet into a water bath, discharging water on the surface of the thick sheet, putting the thick sheet on a longitudinal pull roll, and longitudinally stretching the thick sheet according to requirements. The thick sheet pulled out longitudinally is clamped by a transverse pull chain, and transverse stretching is carried out according to the process requirement, and the setting of the process is mainly the key for adjusting the longitudinal performance of the product. The transversely pulled sheet is put on a tractor and is subjected to traction, shaping and trimming, and the process is the key for adjusting the transverse performance of the product. And starting an online thickness detection instrument to detect the thickness deviation of the product online. And cutting waste edges at two sides of the traction, starting a thickness gauge for online monitoring, and adjusting and correcting the thickness. And (4) threading the cut film on a winding machine for winding, and continuously monitoring the winding quality of the product. Checking the rolling quality on line, and processing products which do not meet the quality requirement according to the regulations. And (3) inspecting the produced products, packaging the qualified products and warehousing the qualified products, treating the unqualified products according to the regulations, unloading the rolled products from a rolling machine, sampling and detecting various quality performances, and packaging and warehousing the products after grading.
To further illustrate the performance effect of the tamper-resistant multilayer easy-release film in this example, the internal bond strength was measured using a scott adhesion tester according to the method specified in TAPPI T569 and the measured value was expressed in kg/cm units. In this example, the internal bonding strength of the substrate layer side was 0.4 to 0.8kg/cm, and the internal bonding strength of the coating layer 4 side was 0.4 to 2.5 kg/cm; the substrate layer has a greater tensile breaking force than the coating layer 4 when stretched in the MD direction. The adhesive strength between the base material layer and the coating layer 4 as measured by the adhesive-peel adhesion strength test method is 8.5N/mm or more, and the base material layer and the coating layer 4 are difficult to peel off, and can be produced efficiently.
By setting the internal bonding strength to 0.4kg/cm or more, the attachment work of the anti-counterfeit multilayer easy-to-tear film can be easily performed without damaging the anti-counterfeit multilayer easy-to-tear film in a normal use state, and the function of the anti-counterfeit multilayer easy-to-tear film can be more effectively exerted. When peeling off, the film is broken when peeling off from the adherend, and a part of the film remains in an arbitrary shape on the adherend, by setting the internal bonding strength of the film on the side opposite to the pressure-sensitive adhesive layer side to 2.5kg · cm or less, so that the film itself is broken without breaking the adherend when the strength of the adherend is relatively weak. The label can be easily visually discriminated from being peeled off from the remaining portion. Further, even if the peeled portion is reattached to the original position, the peeled portion and the remaining portion have arbitrary shapes, so that it is difficult to return to the original shape, and reattachment of the label can be prevented.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An anti-counterfeiting multi-layer easy-to-tear film is characterized by comprising a coating layer and a substrate layer which are sequentially connected;
the base material layer contains a resin composition containing a polyolefin resin and inorganic powder particles;
the coating layer contains a resin mixture of an acrylic resin and an additive.
2. The tamper-resistant multilayer easy-tear film according to claim 1, wherein the polyolefin resin is one or more of polypropylene, ethylene-propylene copolymer and ethylene elastomer.
3. The anti-counterfeiting multi-layer easy-to-tear film according to claim 1, wherein the inorganic powder particles are one or a mixture of calcium carbonate, silica, montmorillonite and kaolin, and have the particle size of 1-15 μm.
4. The anti-counterfeiting multilayer easy-tear film according to claim 1, wherein the substrate layer comprises a first substrate layer, a second substrate layer and a third substrate layer, wherein the first substrate layer and the third substrate layer respectively comprise the following components in percentage by weight: 5-30% of inorganic powder particles and 70-95% of polyolefin;
the second base material layer comprises the following components in percentage by weight: 50-80% of inorganic powder particles and 20-50% of polyolefin.
5. The anti-counterfeiting multi-layer easy-tear film according to claim 1, wherein the additive is one or more selected from the group consisting of optical fibers, particles of metal oxides, silicone, secondary aggregates of precipitated calcium carbonate and montmorillonite, and is used in an amount of 0.1-10% based on the acrylic resin.
6. The anti-counterfeiting multilayer easy-tear film according to claim 1, wherein the anti-counterfeiting multilayer easy-tear film comprises 4-7 layers; the base material layer is 3-5 layers, the thickness of each layer is 4-20 mu m, the void ratio of the base material layer is 30-70%, and the coating amount of the coating layer is 0.1-25g/m2And the coating layer is positioned on the outer side of the anti-counterfeiting multi-layer easy-to-tear film.
7. A method for preparing a false proof multi-layer easy-to-tear film according to any one of claims 1 to 6, which comprises the following steps:
s1, preparing a base material layer film by a biaxial stretching process: 20-50% of polyolefin resin and 50-80% of inorganic powder particles in percentage by weight are added into a main extruder;
adding 70-95% of polyolefin resin and 5-30% of inorganic powder particles in percentage by weight into an auxiliary extruder;
extruding the materials to a T-shaped die head for extrusion, casting a sheet, removing water on the surface of the sheet, preheating, longitudinally stretching, shaping, preheating, transversely stretching, and performing corona treatment to obtain a substrate layer film;
s2, base material layer film coating: after the substrate layer film is drawn and cooled, the substrate layer film is coated by adopting concave roll coating, wire bar coating or film coating, and then a coated product is rolled;
the coating formula is as follows: acrylic resin and additives.
8. A multi-layer easy-to-tear film according to claim 7, wherein in step S1, the longitudinal stretching operation is: the tension of a longitudinal drawing inlet is 180-200n, the temperature of a preheating zone of a longitudinal drawing roller is 77-79 ℃, the temperature of a stretching zone is 84-86 ℃, the temperature of a cooling zone is 24-25 ℃, a thick sheet blown out by cold blowing is threaded on the longitudinal drawing roller, the heating of an auxiliary heating device is set to be 38-40%, and the speed ratio of a fast zone and a slow zone is set to be 3.4-3.6 times.
9. A multi-layer easy-to-tear film according to claim 7, wherein in step S1, the operation of stretching in the transverse direction is: setting the transverse pulling tension to 2600-.
10. The anti-counterfeiting multi-layer easy-to-tear film as claimed in claim 7, wherein in step S2, the acrylic resin and the additive are coated on the substrate layer film by the curtain coating at a pressure of 200-250 bar.
CN202111215614.8A 2021-10-19 2021-10-19 Anti-counterfeiting multilayer easy-to-tear film and preparation method thereof Pending CN114085622A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100062194A1 (en) * 2008-09-04 2010-03-11 Xiao-Dong Sun Anti-counterfeiting methods and devices using substantially transparent fluorescent materials
CN106575491A (en) * 2014-05-29 2017-04-19 优泊公司 Label, method for manufacturing label, method for using label, and body with label

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100062194A1 (en) * 2008-09-04 2010-03-11 Xiao-Dong Sun Anti-counterfeiting methods and devices using substantially transparent fluorescent materials
CN106575491A (en) * 2014-05-29 2017-04-19 优泊公司 Label, method for manufacturing label, method for using label, and body with label

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