CN114536920B - Composite membrane and preparation method and application thereof - Google Patents

Composite membrane and preparation method and application thereof Download PDF

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Publication number
CN114536920B
CN114536920B CN202210178210.4A CN202210178210A CN114536920B CN 114536920 B CN114536920 B CN 114536920B CN 202210178210 A CN202210178210 A CN 202210178210A CN 114536920 B CN114536920 B CN 114536920B
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China
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layer
composite film
polymer layer
thickness
dimensional code
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CN114536920A (en
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张冬
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Shanghai Zijiang Colour Printing & Packaging Co ltd
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Shanghai Zijiang Colour Printing & Packaging Co ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/362—Laser etching
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

The invention provides a composite membrane, a preparation method and application thereof. The composite film comprises a first polymer layer, a first printing ink layer, a first glue layer, a second polymer layer, an aluminized film layer, a second glue layer, a third polymer layer and a two-dimensional code layer which are sequentially overlapped; one surface of the aluminized film layer is attached to one surface of the second polymer layer, which is far away from the first glue layer; the two-dimensional code layer comprises a white ink layer and a transparent polymer layer which are attached to each other, wherein one surface of the white ink layer, which is far away from the transparent polymer layer, is attached to one surface of the third polymer layer, which is far away from the second glue layer; or the two-dimensional code layer is a white polymer layer. The surface of the composite film provided by the invention has clear two-dimensional code patterns, and the aluminum film in the aluminum-plated film layer is complete and undamaged, so that the composite film is suitable for being used as a product packaging film.

Description

Composite membrane and preparation method and application thereof
Technical Field
The invention belongs to the technical field of composite films, and particularly relates to a composite film and a preparation method and application thereof.
Background
The two-dimensional code (also called as two-dimensional bar code) is a bar code with readability in another dimension which is expanded on the basis of the one-dimensional bar code, binary data is represented by black-white rectangular patterns, and information contained in the binary data can be obtained after the binary data is scanned by equipment. It can store more information than the traditional Bar Code Bar Code, and can also represent more data types. The two-dimensional code usually has a specific positioning mark (for example, the QR code is three large positioning points), and the code reader can correctly identify and decode the code through the positioning mark, so that the two-dimensional code can be identified no matter which direction is read.
The two-dimensional code can store various information, mainly including: web addresses, business cards, text messages, specific codes. According to the application mode of the information, the information can be further divided into: 1. online applications, such as web addresses and specific codes, more so; 2. offline applications, such as text information and business cards, and more so offline applications. The two-dimensional bar code has the characteristics of large storage capacity, high confidentiality, high tracking performance, strong damage resistance, large redundancy, low cost and the like, and is particularly suitable for forms, security confidentiality, tracking, license, inventory checking, data redundancy and the like.
The laser coding can be used for coding various characters, symbols, patterns and the like, and the character size can be from millimeter to micrometer, so that the laser coding has special significance for anti-counterfeiting of products. Therefore, laser coding is also being studied more and more. In the prior art, two-dimensional codes can be prepared on corresponding materials by a laser coding method, and two main forming modes of laser coding are as follows: first, infrared laser is used: the material is removed by heating and vaporizing (evaporating) the material surface material, which is commonly referred to as hot working; and secondly, ultraviolet laser is used: the ultraviolet photons with high energy directly break molecular bonds on the surfaces of a plurality of nonmetallic materials, so that the molecules are separated from objects, the mode can not generate high heat, so the cold working is mainly called as cold working, and the ultraviolet laser is mainly adopted (the wavelength is 355 nm).
CN210548870U discloses an automatic positioning laser coding device. The automatic positioning laser coding device comprises: the laser coding device comprises a control assembly, a laser coding assembly and a multi-axis motion assembly; the control assembly is electrically connected with the laser coding assembly and is used for acquiring positioning information of the workpiece, sending the positioning information to the multi-axis motion assembly, and sending a control instruction for coding the workpiece to the laser coding assembly through an electric signal after receiving a trigger instruction; the laser coding component is arranged on the multi-axis motion component and is used for receiving the control instruction and carrying out laser coding on the workpiece according to the control instruction; the multi-axis movement assembly is used for receiving the positioning information, moving to the position of the workpiece according to the positioning information and the laser coding assembly arranged on the positioning information, and sending the triggering instruction to the control assembly. The automatic positioning laser coding device provided by the technical scheme can accurately realize positioning and save cost.
CN107081970a discloses a method and apparatus for marking invisible two-dimensional code on the surface of metal material by using laser. The apparatus comprises: the system comprises a marking system, a laser, a control system, a beam expander, a galvanometer system, an f-theta lens, an industrial camera system and a code reading system, wherein the laser pulse width of the laser is 1-100 ns; the nominal focal length of the f-theta lens is not greater than 160mm. According to the technical scheme, the invisible two-dimensional codes which cannot be seen by human eyes are marked on the metal material by controlling the pulse width of the laser, the dot diameter and the dot spacing of the two-dimensional code dot matrix, and photographing and reading of the invisible two-dimensional codes are realized through the industrial camera system and the code reading system, so that the invisible anti-counterfeiting function is realized.
CN207888075U discloses a full-automatic integrated application system for laser marking of two-dimension codes of a PCB board. The full-automatic integrated application system for the laser marking of the two-dimension codes of the PCB comprises a transmission mechanism, a PCB interception mechanism, a PCB clapping mechanism, a PCB visual identification mechanism, an upper laser 3D marking mechanism, a lower laser 3D marking mechanism, a visual acquisition system mechanism and a man-machine operation platform. One side of the transmission mechanism is provided with a man-machine operation platform, the PCB board beating mechanism is positioned at two sides of the transmission mechanism, the PCB interception mechanism is positioned in the middle of the transmission mechanism, the upper laser 3D marking mechanism and the lower laser 3D marking mechanism are respectively positioned above and below the transmission mechanism, the PCB board visual recognition mechanism is positioned above the PCB interception mechanism, the visual acquisition system mechanism is positioned above the tail end of the transmission mechanism, the transmission mechanism is provided with a sensor, and each mechanism is provided with an electric control device. The application system provided in the technical scheme adopts an upper-lower large-breadth laser marking technology, and can mark the whole PCB two-dimensional code at one time.
In the prior art, a two-dimensional code representation method on a composite film generally uses an ink-jet coding technology, the technology is used for coding the outermost surface of a product packaging material, the ink-jet coding has the defects that characters of the ink-jet coding are easy to wipe off, and the UV curing ink is used for improving the scratch resistance of the characters and the bonding fastness of the characters and the film, but the technology cannot be applied to food packaging because the carcinogenic residual photoinitiator contained in the UV curing ink possibly migrates to pollute food. The laser coding method can avoid harm of harmful substances to food safety, but due to thermal effect, the plastic film on the composite film packaging material is easy to carbonize to influence coding quality, and compared with the polyolefin such as polyethylene, polypropylene and the like, the film such as polyester, nylon and the like has very low energy absorptivity to the traditional infrared laser.
When the traditional infrared laser coding is carried out on the composite film with the surface layer being the transparent polymer layer and the middle containing the aluminized structure, the transparent two-dimensional code shape can not be obtained due to the design of the transparent polymer layer, if the energy of laser is increased, the composite film can be penetrated, the structure of the composite film is damaged, and the composite film can not be used. Therefore, how to perform laser coding on a composite film with a transparent polymer layer on the surface layer and an aluminum plated structure in the middle, so that the composite film has a clear two-dimensional code shape and cannot damage the composite film with the aluminum plated structure in the middle, has become a technical problem to be solved in the prior art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a composite membrane and a preparation method and application thereof. According to the invention, through the design of the composite film structure, after the ultraviolet laser or the optical fiber laser is used for coding, the color inversion can be formed on the white ink layer or the white polymer layer, so that a clear two-dimensional code pattern is formed on the surface of the composite film, and an aluminum film in an aluminum plating film layer is not damaged, and the prepared composite film is suitable for being used as a packaging film.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a composite film, which comprises a first polymer layer, a first printing ink layer, a first glue layer, a second polymer layer, an aluminized film layer, a second glue layer, a third polymer layer and a two-dimensional code layer which are sequentially overlapped;
one surface of the aluminized film layer is attached to one surface of the second polymer layer, which is far away from the first glue layer;
the two-dimensional code layer comprises a white ink layer and a transparent polymer layer which are attached to each other, wherein one surface of the white ink layer, which is far away from the transparent polymer layer, is attached to one surface of the third polymer layer, which is far away from the second glue layer;
or the two-dimensional code layer is a white polymer layer.
In the prior art, a method for printing a two-dimensional code on a composite film generally uses an inkjet or laser coding technology to code the outermost surface of a product packaging material. The traditional burning and volatilizing method for infrared laser coding is easy to burn out the packaging material of the composite film, especially for plastic/plastic structures, and when the composite film with the transparent polymer layer on the surface layer and the aluminized film layer in the middle is used for laser coding, the transparent polymer on the surface layer can not obtain clear two-dimensional code patterns; however, increasing the energy of the laser may cause the composite film to be perforated, damage the aluminum film in the aluminum-plated film layer, and finally result in performance degradation of the prepared composite film due to barrier property loss.
Therefore, the invention designs the composite film structure with the transparent polymer layer on the surface layer and the aluminized film layer in the middle, and further enables the light beam to irradiate the middle of the composite film through the transparent polymer layer when the composite film is subjected to laser coding, and breaks the molecular chain of the composite film when passing through the white ink layer or the white polymer layer in the middle, thereby causing photochromism and further forming a two-dimensional code with clear pattern; the invention avoids the problem of damaging the aluminum film in the aluminum plating film layer during laser coding by arranging the white ink layer or the white polymer layer, thereby preparing the complete and undamaged composite film with clear two-dimensional code patterns, and being applicable to the field of packaging.
According to the method, excessive raw materials are not required to be added, related information can be obtained by scanning the two-dimensional code, and the aim of environmental protection can be achieved. The invention provides a technical scheme for solving the problem that the coding is difficult when the middle layer of the composite film is an aluminized film, and if the two-dimensional code layer is made of a white polymer, a white ink layer is not required to be arranged, the two-dimensional code with clear patterns can be obtained, and the scanning state is good.
The following is a preferred technical scheme of the present invention, but not a limitation of the technical scheme provided by the present invention, and the following preferred technical scheme can better achieve and achieve the objects and advantages of the present invention.
As a preferable technical scheme of the invention, the material of the first polymer layer is selected from BOPP, PET or PA.
The BOPP is a biaxially oriented polypropylene film, the PET is polyethylene terephthalate, and the PA is nylon.
The thickness of the first polymer layer is preferably 10 to 30. Mu.m, for example, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, 23 μm, 25 μm, 27 μm or 30 μm, etc., and more preferably 10 to 25. Mu.m.
In a preferred embodiment of the present invention, the thickness of the first ink layer is not more than 1. Mu.m, for example, 0.2. Mu.m, 0.3. Mu.m, 0.4. Mu.m, 0.5. Mu.m, 0.6. Mu.m, 0.7. Mu.m, 0.8. Mu.m, 0.9. Mu.m, 1. Mu.m, or the like.
Preferably, the thickness of the first glue layer is 1 to 2 μm, and may be, for example, 1 μm, 1.1 μm, 1.2 μm, 1.3 μm, 1.4 μm, 1.5 μm, 1.6 μm, 1.7 μm, 1.8 μm, 1.9 μm, or 2 μm, etc.
As a preferred embodiment of the present invention, the second polymer layer is an LDPE layer.
The LDPE is low-density polyethylene.
Preferably, the thickness of the second polymer layer is 10 to 15 μm, and may be, for example, 10 μm, 10.5 μm, 11 μm, 11.5 μm, 12 μm, 12.5 μm, 13 μm, 13.5 μm, 15 μm, or the like.
As a preferable technical scheme of the invention, the aluminized film layer is made of VMPET or VMOPP.
The VMPET is a polyester aluminizer, and the VMOPP layer is a polypropylene aluminizer.
Preferably, the thickness of the aluminized film layer is 10 to 20 μm, and may be, for example, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, or the like.
In a preferred embodiment of the present invention, the thickness of the second adhesive layer is 1 to 2. Mu.m, for example, 1 μm, 1.1 μm, 1.2 μm, 1.3 μm, 1.4 μm, 1.5 μm, 1.6 μm, 1.7 μm, 1.8 μm, 1.9 μm, or 2 μm.
Preferably, the third polymer layer is an LDPE layer.
The thickness of the third polymer layer is preferably 10 to 15. Mu.m, and may be, for example, 10. Mu.m, 10.5. Mu.m, 11. Mu.m, 11.5. Mu.m, 12. Mu.m, 12.5. Mu.m, 13. Mu.m, 13.5. Mu.m, 15. Mu.m, or the like.
In a preferred embodiment of the present invention, the thickness of the white ink layer is 1 μm or less, and may be, for example, 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, or 1 μm.
Preferably, the thickness of the transparent polymer layer is not less than 30 μm (for example, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm or 70 μm, etc.), and more preferably 30 to 50 μm.
It should be noted that the material of the transparent polymer layer in the present invention is not limited to any specific one, and transparent polymer layers commonly used in the art are suitable, and exemplary include, but are not limited to: transparent PE (polyethylene), transparent CPP (cast polypropylene film).
Preferably, the thickness of the white polymer layer is 30 to 80. Mu.m, for example, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm or the like may be used.
Meanwhile, the material of the white polymer layer is not limited in this invention, and the white polymer layer commonly used in the art is suitable, and exemplary includes but is not limited to: white PE.
In a second aspect, the present invention provides a method for preparing a composite film according to the first aspect, comprising the steps of:
and after the first polymer layer, the first printing ink layer, the first glue layer, the second polymer layer, the aluminized film layer, the second glue layer, the third polymer layer and the two-dimensional code layer which are sequentially overlapped are compounded, carrying out laser coding on one side, far away from the third polymer, of the two-dimensional code layer, so as to obtain the packaging composite film.
In a preferred embodiment of the present invention, the laser coding power is 70 to 90%, for example, 70%, 72%, 74%, 76%, 78%, 80%, 82%, 84%, 86%, 88%, 90%, or the like.
In the present invention, the laser coding power of 70 to 90% means that the laser coding power is 70 to 90% of 15W, based on 100% of the total power.
Preferably, the time for the laser coding is 15 to 25 μs, for example, 15 μs, 16 μs, 17 μs, 18 μs, 19 μs, 20 μs, 21 μs, 22 μs, 23 μs, 24 μs, 25 μs, or the like.
According to the invention, the composite film with clear two-dimensional code patterns on the surface can be obtained by controlling the power and time of laser coding within a specific range. If the power of the laser coding is too high or the time is too long, the composite film is easy to burn, a burnt trace is generated on the surface of the composite film, and the prepared composite film cannot be used; if the laser coding power is too small or the laser coding time is too short, a composite film with a clear two-dimensional code pattern on the surface cannot be obtained.
Preferably, the power of the laser coding is 70%, and the time of the laser coding is 15 μs.
In a third aspect, the present invention provides the use of a composite film according to the first aspect in product packaging.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, through the design of the composite film structure, the composite film with clear two-dimensional code patterns on the surface can be obtained by further arranging the white ink layer or the white polymer layer and controlling the power and time of laser coding within a specific range, and meanwhile, the aluminum film in the aluminum plating film layer can not be damaged, so that the prepared composite film is suitable for the field of product packaging.
Drawings
FIG. 1 is a schematic structural view of a composite membrane according to embodiment 1 of the present invention;
FIG. 2 is a schematic structural view of a composite membrane according to example 13 of the present invention;
the three-dimensional ink comprises a first polymer layer, a first ink layer, a first glue layer, a second polymer layer, an aluminized film layer, a second aluminized film layer, a third polymer layer, a two-dimensional code layer, a white ink layer and a transparent polymer layer, wherein the first polymer layer, the first ink layer, the second ink layer, the first glue layer, the second polymer layer, the aluminized film layer, the second glue layer, the third polymer layer, the two-dimensional code layer, the 81-white ink layer and the transparent polymer layer are arranged on the transparent polymer layer.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
Some of the component sources in the following examples and comparative examples are as follows:
BOPP: the model of the traditional Chinese medicine is conventional;
LDPE: han Hua, model LD955; the model OE850;
VMPET: the model is conventional;
CPP: double-body, model extrusion replication;
white PE: shanghai purple Jiang Caiyin.
Example 1
The embodiment provides a composite film, the structural schematic diagram of which is shown in fig. 1, wherein the composite film comprises a first polymer layer 1, a first printing ink layer 2, a first glue layer 3, a second polymer layer 4, an aluminized film layer 5, a second glue layer 6, a third polymer layer 7 and a two-dimensional code layer 8 which are sequentially overlapped;
the first polymer layer 1 is BOPP and has a thickness of 25 μm;
the thickness of the first ink layer 2 is 0.8 μm, and the thickness of the first glue layer 3 is 1.5 μm;
the second polymer layer 4 is an LDPE layer (prepared by LD955 and OE850 according to a mass ratio of 4:1) and has a thickness of 12 μm;
one surface of the aluminized film layer 5, which is aluminized, is attached to one surface of the second polymer layer 4, which is far away from the first glue layer 3, and the material of the aluminized film layer is VMPET, and the thickness of the aluminized film layer is 12 mu m;
the thickness of the second glue layer 6 is 2 μm;
the third polymer layer 7 is an LDPE layer (LD 955) with a thickness of 15 μm;
the two-dimensional code layer 8 comprises a white ink layer 81 and a transparent PE layer 82 which are attached to each other, wherein one surface of the white ink layer 81 far away from the transparent polymer layer 82 is attached to one surface of the third polymer layer 7 far away from the second glue layer 6;
the thickness of the white ink layer 81 is 1 μm;
the transparent polymer layer 82 is made of CPP and has a thickness of 40 μm.
The preparation method of the composite film comprises the following steps:
after a first polymer layer 1, a first printing ink layer 2, a first glue layer 3, a second polymer layer 4, an aluminized film layer 5, a second glue layer 6, a third polymer layer 7 and a two-dimensional code layer 8 which are sequentially overlapped are compounded, carrying out laser coding on one side, far away from the third polymer 7, of the two-dimensional code layer 8, so as to obtain the packaging composite film; wherein the power of the laser coding is 70% and the time is 15 mu s.
Example 2
This example provides a composite membrane, which differs from example 1 in that:
the thickness of the first polymer layer is 30 μm; the thickness of the first ink layer is 0.5 μm, and the thickness of the first glue layer 3 is 1 μm; the thickness of the second polymer layer is 10 μm; the thickness of the aluminized film layer is 15 mu m; the thickness of the second glue layer is 1.2 mu m; the thickness of the third polymer layer is 14 μm; the thickness of the white ink layer is 0.9 μm; the transparent polymer layer has a thickness of 30 μm; the power of the laser coding is 70%, and the time is 25 mu s;
other conditions were the same as in example 1.
Example 3
This example provides a composite membrane, which differs from example 1 in that:
the first polymer layer has a thickness of 25 μm; the thickness of the first ink layer is 0.7 μm, and the thickness of the first glue layer 3 is 2 μm; the thickness of the second polymer layer is 15 μm; the thickness of the aluminized film layer is 10 mu m; the thickness of the second glue layer is 1 μm; the thickness of the third polymer layer is 10 μm; the thickness of the white ink layer is 0.6 μm; the transparent polymer layer has a thickness of 25 μm; the power of the laser coding is 80%, and the time is 20 mu s;
other conditions were the same as in example 1.
Example 4
This example provides a composite membrane, which differs from example 1 in that:
the thickness of the first polymer layer is 20 μm; the thickness of the first ink layer is 1 μm, and the thickness of the first glue layer 3 is 1.8 μm; the thickness of the second polymer layer is 13 μm; the thickness of the aluminized film layer is 12 mu m; the thickness of the second glue layer is 2 mu m; the thickness of the third polymer layer is 15 μm; the thickness of the white ink layer is 1 μm; the transparent polymer layer has a thickness of 50 μm; the power of the laser coding is 70%, and the time is 20 mu s;
other conditions were the same as in example 1.
Example 5
This example provides a composite film differing from example 1 only in that the laser coding power is 80% and the other conditions are the same as example 1.
Example 6
This example provides a composite film differing from example 1 only in that the laser coding power is 90%, and the other conditions are the same as example 1.
Example 7
This example provides a composite film differing from example 1 only in that the laser coding power is 60% and the other conditions are the same as example 1.
Example 8
This example provides a composite film differing from example 1 only in that the laser coding power is 95% and the other conditions are the same as example 1.
Example 9
This example provides a composite film differing from example 1 only in that the laser coding time is 20 mus, and the other conditions are the same as example 1.
Example 10
This example provides a composite film differing from example 1 only in that the laser coding time is 25 mus, and the other conditions are the same as example 1.
Example 11
This example provides a composite film differing from example 1 only in that the laser coding time is 10 mus, and the other conditions are the same as example 1.
Example 12
This example provides a composite film differing from example 1 only in that the laser coding time is 30 mus, and the other conditions are the same as example 1.
Example 13
The embodiment provides a composite film, the structural schematic diagram of which is shown in fig. 2, wherein the composite film comprises a first polymer layer 1, a first printing ink layer 2, a first glue layer 3, a second polymer layer 4, an aluminized film layer 5, a second glue layer 6, a third polymer layer 7 and a two-dimensional code layer 8 which are sequentially overlapped;
the first polymer layer 1 is BOPP and has a thickness of 18 μm;
the thickness of the first ink layer 2 is 0.8 μm, and the thickness of the first glue layer 3 is 1.5 μm;
the second polymer layer 4 is an LDPE (OE 850) layer with a thickness of 12 μm;
one surface of the aluminized film layer 5, which is aluminized, is attached to one surface of the second polymer layer 4, which is far away from the first glue layer 3, and the material of the aluminized film layer is VMPET, and the thickness of the aluminized film layer is 12 mu m;
the thickness of the second glue layer 6 is 2 μm;
the third polymer layer 7 is an LDPE layer with the thickness of 15 mu m;
the two-dimensional code layer 8 is white PE, and the thickness is 50 mu m.
The preparation method of the composite film comprises the following steps:
after a first polymer layer 1, a first printing ink layer 2, a first glue layer 3, a second polymer layer 4, an aluminized film layer 5, a second glue layer 6, a third polymer layer 7 and a two-dimensional code layer 8 which are sequentially overlapped are compounded, carrying out laser coding on one side, far away from the third polymer 7, of the two-dimensional code layer 8, so as to obtain the packaging composite film; wherein the power of the laser coding is 70% and the time is 15 mu s.
Comparative example 1
This comparative example provides a composite film differing from example 1 only in that the two-dimensional code layer does not include a white ink layer, and other conditions are the same as example 1.
The performance of the composite films provided in the above examples and comparative examples was tested as follows:
two-dimensional code shape: observing whether the shapes of the two-dimensional codes formed on the two-dimensional code layers of the inner layers of the composite films provided by the embodiment and the comparative example are complete and clear;
code scanning state: and scanning the two-dimensional code layer on the inner layer of the composite film provided by the embodiment and the comparative example to check whether related information can be obtained.
The results of the performance test of the composite films provided in the above examples and comparative examples are shown in table 1 below:
TABLE 1
As can be seen from the contents of Table 1, the invention further sets a white ink layer or a white polymer layer by designing the composite film structure, and controls the power and time of laser coding within a specific range, so that the composite film with clear two-dimensional code patterns on the surface can be obtained, and meanwhile, the aluminum film in the aluminum plating film layer can not be damaged, so that the prepared composite film is suitable for the field of product packaging.
Compared with the embodiment 1, if the power of the laser coding is too small (embodiment 7), the two-dimensional code pattern obtained on the surface of the composite film is shallow, and related information can be obtained through multiple times of scanning; if the laser coding power is too high (example 8), the two-dimensional code pattern obtained on the surface of the composite film is deep, and the relevant information cannot be obtained by scanning, so that the prepared composite film cannot be used.
Compared with the embodiment 1, if the laser coding time is too short (embodiment 11), the two-dimensional code pattern obtained on the surface of the composite film is shallow, and related information can be obtained through multiple times of scanning; if the laser coding time is too long (example 12), the two-dimensional code pattern obtained on the surface of the composite film is deep, and the relevant information cannot be obtained by scanning, so that the prepared composite film cannot be used.
In comparison with example 1, if the white ink layer is not provided in the composite film (comparative example 1), the aluminum film in the aluminum thin film layer is perforated, and the composite film is damaged.
In summary, by designing the composite film structure, the invention further controls the power and time of laser coding to be within a specific range by arranging the white ink layer or the white polymer layer, so that the composite film with clear two-dimensional code patterns on the surface can be obtained, and meanwhile, the aluminum film in the aluminum plating film layer can not be damaged, so that the prepared composite film is suitable for the field of product packaging.
The applicant states that the detailed structural features and detailed process flows of the present invention are described by the above embodiments, but the present invention is not limited to the above detailed structural features and detailed process flows, i.e. it does not mean that the present invention must be implemented depending on the above detailed structural features and detailed process flows. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of raw materials for the product of the present invention, addition of auxiliary components, selection of specific modes, etc., falls within the scope of the present invention and the scope of disclosure.

Claims (21)

1. The composite film is characterized by comprising a first polymer layer, a first printing ink layer, a first glue layer, a second polymer layer, an aluminized film layer, a second glue layer, a third polymer layer and a two-dimensional code layer which are sequentially overlapped;
one surface of the aluminized film layer is attached to one surface of the second polymer layer, which is far away from the first glue layer;
the two-dimensional code layer comprises a white ink layer and a transparent polymer layer which are attached to each other, wherein one surface of the white ink layer, which is far away from the transparent polymer layer, is attached to one surface of the third polymer layer, which is far away from the second glue layer;
or the two-dimensional code layer is a white polymer layer;
the composite membrane is prepared by a method comprising:
the method comprises the steps of compounding a first polymer layer, a first printing ink layer, a first glue layer, a second polymer layer, an aluminized film layer, a second glue layer, a third polymer layer and a two-dimensional code layer which are sequentially overlapped, and then carrying out laser coding on one side, far away from the third polymer, of the two-dimensional code layer to obtain the composite film;
the total power of laser coding is calculated as 15W of 100%, and the power of the laser coding is 70-90%.
2. The composite film of claim 1, wherein the first polymer layer is selected from BOPP, PET, or PA.
3. The composite film of claim 1, wherein the first polymer layer has a thickness of 10 to 30 μm.
4. A composite film according to claim 3, wherein the first polymer layer has a thickness of 10 to 25 μm.
5. The composite film of claim 1, wherein the first ink layer has a thickness of 1 μm or less.
6. The composite film of claim 1, wherein the first glue layer has a thickness of 1 to 2 μm.
7. The composite film of claim 1 wherein the second polymer layer is an LDPE layer.
8. The composite film of claim 1, wherein the second polymer layer has a thickness of 10 to 15 μm.
9. The composite film according to claim 1, wherein the aluminized film layer is made of VMPET or VMOPP.
10. The composite film according to claim 1, wherein the aluminized film layer has a thickness of 10 to 20 μm.
11. The composite film of claim 1, wherein the second glue layer has a thickness of 1 to 2 μm.
12. The composite film of claim 1 wherein the third polymer layer is an LDPE layer.
13. The composite film of claim 1, wherein the third polymer layer has a thickness of 10 to 15 μm.
14. The composite film of claim 1, wherein the white ink layer has a thickness of 1 μm or less.
15. The composite film according to claim 1, wherein the transparent polymer layer has a thickness of 30 μm or more.
16. The composite film according to claim 15, wherein the transparent polymer layer has a thickness of 30 to 50 μm.
17. The composite film according to claim 1, wherein the white polymer layer has a thickness of 30 to 80 μm.
18. A method of preparing a composite film according to any one of claims 1 to 17, comprising the steps of:
the method comprises the steps of compounding a first polymer layer, a first printing ink layer, a first glue layer, a second polymer layer, an aluminized film layer, a second glue layer, a third polymer layer and a two-dimensional code layer which are sequentially overlapped, and then carrying out laser coding on one side, far away from the third polymer, of the two-dimensional code layer to obtain the composite film;
the total power of laser coding is calculated as 15W of 100%, and the power of the laser coding is 70-90%.
19. The method of claim 18, wherein the laser coding time is 15 to 25 μs.
20. The method of claim 19, wherein the laser coding is performed at a power of 70% and a time of 15 μs.
21. Use of a composite film according to any one of claims 1 to 17 in product packaging.
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