CN107686963B - A kind of cold seal film and preparation method thereof - Google Patents
A kind of cold seal film and preparation method thereof Download PDFInfo
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- CN107686963B CN107686963B CN201710719803.6A CN201710719803A CN107686963B CN 107686963 B CN107686963 B CN 107686963B CN 201710719803 A CN201710719803 A CN 201710719803A CN 107686963 B CN107686963 B CN 107686963B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 239000010410 layer Substances 0.000 claims abstract description 110
- 239000000758 substrate Substances 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 40
- 239000011241 protective layer Substances 0.000 claims abstract description 26
- 238000001704 evaporation Methods 0.000 claims abstract description 21
- 239000003292 glue Substances 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims description 62
- 229920006378 biaxially oriented polypropylene Polymers 0.000 claims description 38
- 239000011127 biaxially oriented polypropylene Substances 0.000 claims description 38
- 238000000576 coating method Methods 0.000 claims description 38
- 239000011248 coating agent Substances 0.000 claims description 35
- 239000000463 material Substances 0.000 claims description 33
- 229910052782 aluminium Inorganic materials 0.000 claims description 32
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 32
- 238000007738 vacuum evaporation Methods 0.000 claims description 24
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 23
- 229920002635 polyurethane Polymers 0.000 claims description 23
- 239000004814 polyurethane Substances 0.000 claims description 23
- -1 polyethylene terephthalate Polymers 0.000 claims description 21
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 21
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 21
- 239000012945 sealing adhesive Substances 0.000 claims description 21
- 230000003647 oxidation Effects 0.000 claims description 16
- 238000007254 oxidation reaction Methods 0.000 claims description 16
- 238000003851 corona treatment Methods 0.000 claims description 11
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 238000007788 roughening Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims 4
- 230000008020 evaporation Effects 0.000 abstract description 12
- 238000004132 cross linking Methods 0.000 abstract 1
- 238000012856 packing Methods 0.000 abstract 1
- 239000010408 film Substances 0.000 description 165
- 238000001723 curing Methods 0.000 description 14
- 239000002904 solvent Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 8
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000005269 aluminizing Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000003854 Surface Print Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000000016 photochemical curing Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 201000009240 nasopharyngitis Diseases 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
- 238000001029 thermal curing Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/04—Coating on selected surface areas, e.g. using masks
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/14—Metallic material, boron or silicon
- C23C14/20—Metallic material, boron or silicon on organic substrates
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/24—Vacuum evaporation
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Laminated Bodies (AREA)
- Wrappers (AREA)
Abstract
The present invention provides a kind of cold seal films and preparation method thereof, are related to cold seal packing technique field, not dried adequately in solution cold seal light oil reservoir, after caused cold seal film saves a period of time, and the bad problem of cold seal performance.The preparation method of the cold seal film includes: to provide a substrate；Cross-linking printing ink is coated in the one side of substrate, so that the surface of coated substrate ink forms ink layer；Ink protective layer is formed away from the surface of substrate in the ink layer using evaporation process；Patterned cold seal glue is formed away from the surface of ink layer in substrate.The preparation method of cold seal film provided by the invention is used in preparation cold seal film.
Description
Technical Field
The invention relates to the technical field of cold-seal packaging, in particular to a cold-seal film and a preparation method thereof.
Background
The cold sealing film is formed by coating patterned cold sealing glue on the surface of a non-printing layer of a substrate. Under the normal temperature state, through sealing the pressure to the packaging film, can make the cold seal glue on the cold seal film adhere together to realize the involution of article.
The common cold seal film is generally a surface-printing structure cold seal film, and the surface-printing structure cold seal film generally comprises a cold seal gloss oil layer, an ink layer, a base material layer and a patterned cold seal adhesive which are sequentially overlapped together; the cold sealing gloss oil layer is used for protecting the ink layer of the ink layer so as to ensure that the color of the cold sealing film can be relatively durable; moreover, the patterned cold sealing adhesive can be prevented from being reversely adhered to the ink layer, and the sealing is ensured to be normal.
However, when a cold sealing film with a surface printing structure is prepared, if the cold sealing gloss oil layer is not sufficiently dried, after the cold sealing film is stored for a period of time, the cold sealing gloss oil of the cold sealing gloss oil layer is easily transferred to the patterned cold sealing adhesive, so that the cold sealing performance of the patterned cold sealing adhesive is reduced, even disappears, and the cold sealing film is easily sealed insecurely or even cannot be sealed.
Disclosure of Invention
The invention aims to provide a preparation method of a cold sealing film, which aims to solve the problem that the cold sealing performance is poor after the cold sealing film is stored for a period of time due to insufficient drying of a cold sealing gloss oil layer.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a cold sealing film comprises the following steps:
providing a base material;
coating crosslinkable printing ink on one side of the substrate, so that an ink layer is formed on the surface of the substrate coated with the printing ink;
forming an ink protective layer on the surface of the ink layer, which is far away from the substrate, by adopting an evaporation process;
and forming patterned cold sealing glue on the surface of the substrate, which is far away from the ink layer.
Compared with the prior art, in the preparation method of the cold seal film, the cross-linkable printing ink is coated on one surface of the substrate, so that the ink layer is formed on the surface of the substrate coated with the cross-linkable printing ink, then the ink protective layer is formed on the surface of the ink layer away from the substrate by adopting the evaporation process, and the material to be evaporated needs to be heated in a vacuum environment during evaporation, so that the material is gasified and evaporated on the surface of the ink layer away from the substrate; therefore, even if the material to be evaporated contains a solvent, the material to be evaporated can be completely volatilized under the heating condition of the vacuum environment, so that the ink protection layer evaporated on the surface, away from the substrate, of the ink layer can not contain the solvent.
The invention also provides a cold seal film, which is prepared by adopting the preparation method of the cold seal film provided by the technical scheme.
Compared with the prior art, the beneficial effects of the cold seal film provided by the invention are the same as those of the preparation method of the cold seal film, and are not repeated herein.
Drawings
FIG. 1 is a flow chart of a method for manufacturing a cold seal film according to an embodiment of the present invention;
FIG. 2 is a flow chart of a first method for forming an ink protection layer according to an embodiment of the present invention;
FIG. 3 is a flow chart of a second method for forming an ink protection layer according to an embodiment of the present invention.
Detailed Description
The cold seal film and the preparation method thereof provided by the invention are explained in detail below with reference to the accompanying drawings.
As shown in fig. 1, a method for preparing a cold seal film according to an embodiment of the present invention includes:
s100: providing a base material, coating the cross-linkable printing ink on one surface of the base material, and forming an ink layer on the surface of the base material coated with the cross-linkable printing ink;
s200: forming an ink protective layer on the surface of the ink layer, which is far away from the base material, by adopting an evaporation process;
s300: and forming patterned cold sealing glue on the surface of the base material, which is far away from the ink layer.
Based on the preparation process of the cold seal film, in the preparation method of the cold seal film provided by the embodiment of the invention, the crosslinkable printing ink is coated on one surface of the substrate, so that the surface of the substrate coated with the crosslinkable printing ink forms the ink layer, then the evaporation process is adopted to form the ink protection layer on the surface of the ink layer away from the substrate, and during evaporation, the material to be evaporated needs to be heated in a vacuum environment, so that the material is evaporated to the surface of the ink layer away from the substrate; therefore, even if the material to be evaporated contains a solvent, the material to be evaporated can be completely volatilized under the heating condition of the vacuum environment, so that the ink protection layer evaporated on the surface, away from the substrate, of the ink layer can not contain the solvent.
The substrate may be a vacuum aluminum-plated film, and the ink layer is formed on an aluminum-plated surface of the vacuum aluminum-plated film; the patterned cold sealing adhesive is coated on the surface of the vacuum aluminum-plated film, which is far away from the aluminum-plated surface, so that the ink and the patterned cold sealing adhesive can be isolated through the aluminum film on the aluminum-plated surface of the vacuum aluminum-plated film, and the ink is prevented from permeating into the patterned cold sealing adhesive through the vacuum aluminum-plated film; in other words, the method for preparing the cold sealing film provided by the embodiment of the invention can adopt the vacuum aluminum-plated film to protect the ink of the ink layer.
The vacuum aluminized film is exemplarily a vacuum aluminized biaxially oriented polypropylene film or a vacuum aluminized polyethylene terephthalate film, but other vacuum aluminized films capable of being used as a substrate can be selected, and are not listed here.
Further, in order to make the ink layer and the patterned photoresist better fit on two different surfaces of the substrate, before coating the crosslinkable printing ink on one surface of the substrate, the preparation method of the cold seal film further comprises the following steps: and roughening the whole surface of the base material to ensure that the contact area between the ink layer and the patterned cold sealing adhesive and the surface of the base material is larger, so that the ink layer and the patterned cold sealing adhesive can be formed on the surface of the base material more closely.
Optionally, the roughening treatment may be performed by various methods, for example: and (4) performing corona treatment. When roughening is carried out by means of corona treatment, the corona treatment is carried out by carrying out corona discharge on the surface of the base material by using high-frequency high voltage (high-frequency alternating current voltage reaches 5000-2) And low-temperature plasma is generated, so that the molecular structure on the surface of the printing stock is rearranged on the surface of the base material, more polar parts are generated, and the ink layer and the patterned cold sealing adhesive can be better formed on the surface of the base material.
In addition, when the substrate is a vacuum aluminum-plated film, the surface of the vacuum aluminum-plated film is corona-treated, and the aluminum-plated surface of the vacuum aluminum-plated film has increased roughness, and the material of the aluminum-plated surface of the vacuum aluminum-plated film is substantially an aluminum film, which is oxidized and passivated by the aluminum material after corona treatment to form a dense aluminum oxide film, thereby further increasing the isolation of the substrate from the ink layer ink.
In addition, when the ink layer is formed in the above embodiment, the used crosslinkable printing ink is the ultraviolet light curable ink, so that when the ultraviolet light curable ink is coated on the surface of the substrate, the ultraviolet light curable ink can be cured by using ultraviolet light, so that the ink layer is formed on the surface of the substrate, and the influence of thermal curing on the substrate is also avoided.
Considering that the cold-seal gloss oil layer in the cold-seal film in the prior art is sensitive to temperature, the cold-seal film can only be stored at low temperature, and the storage condition of the cold-seal film is harsh; based on this, as shown in fig. 2 and 3, the ink thin film layer can be formed by the following two methods.
The first method comprises the following steps: as shown in fig. 2, the forming of the ink protection layer on the surface of the ink layer away from the substrate by using the vacuum evaporation process includes:
S210A: carrying out vacuum evaporation on the ultraviolet curing polyurethane acrylate vacuum evaporation coating to the surface of the ink layer away from the substrate;
S220A: and carrying out ultraviolet curing treatment on the ultraviolet curing polyurethane acrylate vacuum evaporation coating evaporated on the surface of the ink layer, which is far away from the base material, so as to obtain the cross-linked polyurethane acrylate film serving as the ink protective layer.
According to the specific process of forming the ink protection layer on the surface of the ink layer, which is far away from the base material, by adopting the evaporation process, the material for forming the ink protection layer is the ultraviolet-curing polyurethane acrylate vacuum evaporation coating, after the ultraviolet-curing polyurethane acrylate vacuum evaporation coating is evaporated on the surface of the ink layer and is cured, the formed cross-linked polyurethane acrylate film serving as the ink protection layer is smooth like a mirror surface, high in surface hardness, good in adhesive force and comparable to metal and relatively resistant, and tests prove that the hardness of the surface coating can finally reach about 6 hours to prevent the mirror surface from being peeled off, so that the cold-seal film provided by the embodiment of the invention can seal objects with high density, has good pressure resistance and wear resistance and is not easy to damage. Moreover, because the printing ink protective layer is formed by combining the evaporation coating process and the photocuring process, most of solvents are volatilized in the evaporation coating process, and after the printing ink protective layer is formed, almost no solvent is left, so that the phenomenon that the solvent is left can be reduced or even eliminated by forming the printing ink protective layer on the surface of the printing ink layer, which deviates from the base material, by adopting the evaporation coating process, so that the problems of cold seal and capacity reduction can be avoided after the cold seal film is stored for a period of time. In addition, the cross-linked polyurethane acrylate film is not sensitive to temperature, so that the problem that the cold sealing film needs to be stored at low temperature when the cold sealing gloss oil layer is used as an ink protective layer is solved.
In order to improve the flexibility of the cross-linked polyurethane acrylate film, the thickness of the cross-linked polyurethane acrylate film is limited between 2nm and 5nm so as to avoid brittleness caused by over hardness of the cross-linked polyurethane acrylate film.
The second method comprises the following steps: as shown in fig. 3, the ink protective layer formed on the surface of the ink layer away from the substrate by using the vacuum evaporation process can be further manufactured by the following method:
S210B: and evaporating metal aluminum to the surface of the ink layer departing from the substrate by adopting a vacuum evaporation process to form an aluminum film with the thickness of 5nm-7 nm.
S220B: and oxidizing the aluminum film by adopting a low-temperature plasma oxidation all-in-one machine to obtain the aluminum oxide film serving as the ink protective layer.
The low-temperature plasma oxidation all-in-one machine has the advantages that when the low-temperature plasma oxidation all-in-one machine is used for carrying out oxidation treatment on metal aluminum, the temperature is low, damage of the ink layer and the base material layer caused by overhigh temperature is reduced, in addition, after oxidation, the formed ink protection layer is an aluminum oxide film, the abrasion resistance is high, in addition, the ink protection layer is obtained through oxidation of the aluminum film with the thickness of 5nm-7nm, and therefore, the aluminum oxide film also has good flexibility. Meanwhile, as the vacuum evaporation process is adopted when the aluminum film is manufactured, and the plasma oxidation process is adopted when the aluminum film is subjected to oxidation treatment, no solvent is involved in the whole process, so that no solvent residue exists in the formed aluminum oxide film serving as the ink protective layer, and the sealing performance of the cold sealing film during cold sealing is still good after the cold sealing film is stored for a period of time. In addition, because the alumina film is not sensitive to temperature, the problem that the cold seal film needs to be stored under low temperature when the cold seal gloss oil layer is used as an ink protective layer is also solved.
Further, the step of forming the patterned cold sealing adhesive on the surface of the substrate away from the ink layer includes: coating patterned cold sealing glue on the surface of the base material, which is far away from the ink layer, so as to obtain a cold sealing glue layer; wherein the cold sealing glue is 2g/m2-3g/m2The coating amount of (2) is applied to the surface of the substrate facing away from the ink layer.
In view of the technical problems solved by the embodiments of the present invention in the prior art, the coating weight of the cold sealing adhesive is increased, and generally, after the coating weight of the cold sealing adhesive is increased, the coating weight of the cold sealing adhesive is 4g/m2-5g/m2In the embodiment of the invention, the ink protective layer is manufactured by using the evaporation process, so that the cold sealing adhesive is 2g/m2-3g/m2The coating amount is coated on the surface of the base material, which is far away from the ink layer, and the sealing performance of the cold sealing adhesive is still good after the base material is stored for a period of time.
The embodiment of the invention also provides a cold seal film, which is prepared by adopting the preparation method of the cold seal film.
Compared with the prior art, the beneficial effects of the cold seal film provided by the invention are the same as those of the preparation method of the cold seal film, and are not repeated herein.
In order to verify the performance of the cold seal film provided by the embodiment of the present invention, several embodiments are given below for illustration.
Example one
Providing a vacuum aluminized biaxially oriented polypropylene film; performing corona treatment on the vacuum aluminized biaxially oriented polypropylene film to passivate an aluminum film on an aluminized surface of the vacuum aluminized biaxially oriented polypropylene film;
coating crosslinkable printing ink on one surface of the vacuum aluminized biaxially-oriented polypropylene film to form an ink layer on the surface of the vacuum aluminized biaxially-oriented polypropylene film coated with the crosslinkable printing ink;
evaporating the ultraviolet curing urethane acrylate vacuum evaporation coating to the surface of the ink layer away from the vacuum aluminizing biaxially oriented polypropylene film;
carrying out ultraviolet curing treatment on the ultraviolet curing polyurethane acrylate vacuum evaporation coating evaporated on the surface of the ink layer away from the vacuum aluminizing biaxially-oriented polypropylene film to obtain a cross-linked polyurethane acrylate film serving as an ink protective layer; the thickness of the cross-linked polyurethane acrylate film is 2 nm;
according to 2g/m2And forming patterned cold sealing glue on the surface of the vacuum aluminized biaxially-oriented polypropylene film, which is away from the ink layer.
The cold seal film prepared in example one was bent 2000 times repeatedly, and no tear was observed in the crosslinked urethane acrylate film.
Example two
Providing a vacuum aluminized polyethylene terephthalate film; carrying out corona treatment on the vacuum aluminized polyethylene terephthalate film to passivate the aluminum film on the aluminized surface of the vacuum aluminized polyethylene terephthalate film;
coating crosslinkable printing ink on one surface of the vacuum aluminized polyethylene terephthalate film, so that an ink layer is formed on the surface of the vacuum aluminized biaxially-oriented polypropylene film coated with the crosslinkable printing ink;
evaporating the ultraviolet curing urethane acrylate vacuum evaporation coating to the surface of the ink layer away from the vacuum aluminized polyethylene terephthalate film;
carrying out ultraviolet curing treatment on the ultraviolet curing polyurethane acrylate vacuum evaporation coating evaporated on the surface of the ink layer away from the vacuum aluminized polyethylene terephthalate film to obtain a cross-linked polyurethane acrylate film serving as an ink protective layer; the thickness of the cross-linked polyurethane acrylate film is 5 nm;
according to 2.5g/m2The coating amount of the adhesive is that the patterned cold sealing adhesive is formed on the surface of the vacuum aluminized polyethylene terephthalate film, which is away from the ink layer.
The cold seal film prepared in example two was repeatedly bent 2000 times, and no tear mark was observed visually from the crosslinked urethane acrylate film.
Example four
Providing a vacuum aluminized biaxially oriented polypropylene film; performing corona treatment on the vacuum aluminized biaxially oriented polypropylene film to passivate an aluminum film on an aluminized surface of the vacuum aluminized biaxially oriented polypropylene film;
coating crosslinkable printing ink on one surface of the vacuum aluminized biaxially-oriented polypropylene film to form an ink layer on the surface of the vacuum aluminized biaxially-oriented polypropylene film coated with the crosslinkable printing ink;
evaporating the ultraviolet curing urethane acrylate vacuum evaporation coating to the surface of the ink layer away from the vacuum aluminizing biaxially oriented polypropylene film;
carrying out ultraviolet curing treatment on the ultraviolet curing polyurethane acrylate vacuum evaporation coating evaporated on the surface of the ink layer away from the vacuum aluminizing biaxially-oriented polypropylene film to obtain a cross-linked polyurethane acrylate film serving as an ink protective layer; the thickness of the cross-linked polyurethane acrylate film is 2 nm;
according to 3g/m2And forming patterned cold sealing glue on the surface of the vacuum aluminized biaxially-oriented polypropylene film, which is away from the ink layer.
The cold seal film prepared in example three was bent 2000 times repeatedly, and no tear was observed in the crosslinked urethane acrylate film.
Example four
Providing a vacuum aluminized polyethylene terephthalate film; carrying out corona treatment on the vacuum aluminized polyethylene terephthalate film to passivate the aluminum film on the aluminized surface of the vacuum aluminized polyethylene terephthalate film;
coating crosslinkable printing ink on one surface of the vacuum aluminized polyethylene terephthalate film to form an ink layer on the surface of the vacuum aluminized polyethylene terephthalate film coated with the crosslinkable printing ink;
evaporating metal aluminum to the surface of the ink layer away from the vacuum aluminized polyethylene terephthalate film by adopting a vacuum evaporation process to form an aluminum film with the thickness of 5 nm;
carrying out oxidation treatment on the aluminum film by adopting a low-temperature plasma oxidation all-in-one machine to obtain an aluminum oxide film serving as an ink protective layer;
according to 3.5g/m2The coating amount of the adhesive is that the patterned cold sealing adhesive is formed on the surface of the vacuum aluminized polyethylene terephthalate film, which is away from the ink layer.
EXAMPLE five
Providing a vacuum aluminized biaxially oriented polypropylene film; performing corona treatment on the vacuum aluminized biaxially oriented polypropylene film to passivate an aluminum film on an aluminized surface of the vacuum aluminized biaxially oriented polypropylene film;
coating crosslinkable printing ink on one surface of the vacuum aluminized biaxially-oriented polypropylene film to form an ink layer on the surface of the vacuum aluminized biaxially-oriented polypropylene film coated with the crosslinkable printing ink;
evaporating metal aluminum on the surface of the vacuum aluminized biaxially oriented polypropylene film by adopting a vacuum evaporation process to form an aluminum film with the thickness of 7 nm;
carrying out oxidation treatment on the aluminum film by adopting a low-temperature plasma oxidation all-in-one machine to obtain an aluminum oxide film serving as an ink protective layer;
according to 4g/m2And forming patterned cold sealing glue on the surface of the vacuum aluminized biaxially-oriented polypropylene film, which is away from the ink layer.
EXAMPLE six
Providing a vacuum aluminized biaxially oriented polypropylene film; performing corona treatment on the vacuum aluminized biaxially oriented polypropylene film to passivate an aluminum film on an aluminized surface of the vacuum aluminized biaxially oriented polypropylene film;
coating crosslinkable printing ink on one surface of the vacuum aluminized biaxially-oriented polypropylene film to form an ink layer on the surface of the vacuum aluminized biaxially-oriented polypropylene film coated with the crosslinkable printing ink;
evaporating metal aluminum on the surface of the vacuum aluminized biaxially oriented polypropylene film by adopting a vacuum evaporation process to form an aluminum film with the thickness of 6 nm;
carrying out oxidation treatment on the aluminum film by adopting a low-temperature plasma oxidation all-in-one machine to obtain an aluminum oxide film serving as an ink protective layer;
according to 4g/m2And forming patterned cold sealing glue on the surface of the vacuum aluminized biaxially-oriented polypropylene film, which is away from the ink layer.
Comparative example 1
Providing a vacuum aluminized biaxially oriented polypropylene film;
coating crosslinkable printing ink on one surface of the vacuum aluminized biaxially-oriented polypropylene film to form an ink layer on the surface of the vacuum aluminized biaxially-oriented polypropylene film coated with the crosslinkable printing ink;
forming a cold sealing gloss oil layer with the thickness of 4nm on the surface of the ink layer away from the vacuum aluminizing biaxially-oriented polypropylene film; the cold sealing gloss oil layer is an ink protective layer;
according to 3g/m2And forming patterned cold sealing glue on the surface of the vacuum aluminized biaxially-oriented polypropylene film, which is away from the ink layer.
Comparative example No. two
Providing a vacuum aluminized polyethylene terephthalate film;
coating crosslinkable printing ink on one surface of the vacuum aluminized polyethylene terephthalate film to form an ink layer on the surface of the vacuum aluminized polyethylene terephthalate film coated with the crosslinkable printing ink;
forming a cold sealing gloss oil layer with the thickness of 4nm on the surface of the ink layer away from the vacuum aluminized polyethylene terephthalate film; the cold sealing gloss oil layer is an ink protective layer;
according to 3.5g/m2And forming patterned cold sealing glue on the surface of the vacuum aluminized polyethylene terephthalate film, which is away from the ink layer.
In the preparation method of the cold seal film, after the last step is finished, a drying process is performed to dry the patterned cold seal adhesive, and the drying temperature is 65 ℃ to 75 ℃.
TABLE 1 sealing Strength test results of cold seal films stored for different periods of time (sealing Strength Unit N/15 mm)
The sealing strength is measured according to a QB/T2358-1998 plastic film packaging bag heat sealing strength test method under the test conditions of sealing time of 3s and sealing pressure 294N, and then a 15mm wide sample is taken to be tested in a universal material testing machine.
As can be seen from table 1, compared with the test results of the comparative example, the sealing performance of the cold seal film prepared by the method for preparing a cold seal film provided in the embodiment of the present invention is almost not reduced after the substrate is stabilized, while the sealing performance of the cold seal film prepared in the comparative example is greatly reduced after the substrate is stabilized. As can be seen by comparing the first to third examples with the first comparative example, the ink protective layers in the first to third examples are cross-linked urethane acrylate films prepared by combining the evaporation method and the photo-curing process, in which almost no solvent remains, while the first comparative example is a cold sealing gloss oil layer prepared by using the conventional technique, in which relatively much solvent remains; by comparing the example four with the comparative example, it can be found that the sealing performance of the cold sealing adhesive of the cold sealing film is hardly reduced after the substrate is stable, while the sealing performance of the cold sealing adhesive of the cold sealing film prepared in the comparative example two is greatly reduced after the substrate is stable. Therefore, the preparation method of the cold sealing film provided by the embodiment of the invention can solve the problem that the cold sealing performance is poor after the cold sealing film is stored for a period of time due to insufficient drying of the cold sealing gloss oil layer.
Claims (8)
1. A preparation method of a cold sealing film is characterized by comprising the following steps:
providing a substrate, and coating a crosslinkable printing ink on one side of the substrate to form an ink layer on the surface of the substrate coated with the crosslinkable printing ink;
forming an ink protective layer on the surface of the ink layer, which is far away from the substrate, by adopting a vacuum evaporation process;
forming patterned cold sealing glue on the surface of the substrate, which is far away from the ink layer;
wherein, the forming of the ink protection layer on the surface of the ink layer departing from the substrate by adopting a vacuum evaporation process comprises the following steps:
carrying out vacuum evaporation on ultraviolet curing polyurethane acrylate vacuum evaporation coating on the surface, away from the substrate, of the ink layer, and then carrying out ultraviolet curing treatment on the ultraviolet curing polyurethane acrylate vacuum evaporation coating evaporated on the surface, away from the substrate, of the ink layer to obtain a cross-linked polyurethane acrylate film serving as an ink protective layer; the thickness of the cross-linked polyurethane acrylate film is 2nm-5nm, or,
evaporating metal aluminum to the surface of the ink layer, which is far away from the base material, by adopting a vacuum evaporation process to form an aluminum film with the thickness of 5nm-7 nm; and carrying out oxidation treatment on the aluminum film by adopting a low-temperature plasma oxidation all-in-one machine to obtain the aluminum oxide film serving as the ink protective layer.
2. The method for preparing a cold seal film according to claim 1, wherein the substrate is a vacuum aluminized film; wherein,
the ink layer is formed on the aluminum plating surface of the vacuum aluminum plating film; the patterned cold sealing glue is coated on the surface of the vacuum aluminum plating film, which is far away from the aluminum plating surface.
3. The method for preparing a cold seal film according to claim 2, wherein the vacuum aluminized film is a vacuum aluminized biaxially oriented polypropylene film or a vacuum aluminized polyethylene terephthalate film.
4. A method of making a cold seal film according to claim 1, wherein before applying the cross-linkable printing ink on one side of the substrate, the method further comprises: roughening the entire surface of the substrate.
5. The method for preparing a cold-seal film according to claim 4, wherein the roughening treatment is corona treatment.
6. A method for preparing a cold seal film according to any one of claims 1 to 5, wherein the cross-linkable printing ink is an ultraviolet light curing ink.
7. The method for preparing a cold seal film according to claim 1, wherein the step of forming the patterned cold seal on the surface of the substrate facing away from the ink layer comprises:
according to 2g/m2-3g/m2Coating the patterned cold sealing adhesive on the surface of the base material, which is far away from the ink layer, so as to obtain a cold sealing adhesive layer.
8. A cold seal film, which is produced by the production method of the cold seal film according to any one of claims 1 to 7.
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| CN1925981A (en) * | 2004-03-10 | 2007-03-07 | 艾利丹尼森公司 | Labels and labeling process |
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