Uncovering display BOPP film holographic anti-counterfeiting adhesive tape and preparation method thereof

Abstract

The invention belongs to the technical field of adhesive tapes, and particularly relates to an uncovering BOPP film holographic anti-counterfeiting adhesive tape and a manufacturing method thereof.The adhesive tape comprises a single-face corona BOPP double-face heat-sealing light film, an uncovering release layer, a mold pressing coating, a holographic image layer, a compact aluminum plating layer, a supporting coating and an acrylic acid pressure-sensitive adhesive layer are sequentially arranged on the corona face, and a silicone oil release coating is arranged on the other face. The release force of the silicone oil release coating is smaller than that of the uncovering release layer, the uncovering release layer is arranged in a hollowed-out mode and is locally coated on the corona surface, and the mold pressing coating is fully printed. The prepared adhesive tape has the advantage of being good in anti-fake effect.

Description

Technical Field

[0001] The invention belongs to the technical field of adhesive tapes, and in particular relates to a holographic anti-counterfeiting adhesive tape that reveals a BOPP film and a preparation method thereof. Background Art

[0002] At present, in the field of corrugated paper sealing, especially the corrugated paper boxes sealed by automatic sealing machines, most of them use BOPP tape. BOPP tape is easy to be cut by the cutter during the sealing process and will not warp after sealing to cause the box to stretch.

[0003] In high-end food, liquor and other high value-added fields, there has been a phenomenon of replacing products with counterfeit products after peeling off the tape without damage. Therefore, most manufacturers have a strong demand for anti-transfer, anti-peeling, and peeling-off damage tapes. The current market for this type of tape is mainly PET material. For example, the one disclosed on November 23, 2018, with the publication number CN108864970A, is named a revealing holographic color-printed anti-counterfeiting tape and its production method, including a PET tape base film, a release layer on one side of the PET tape base film, and a color printing layer, a first composite coating, a holographic information layer, a second composite coating, a transfer coating and an adhesive layer on the other side. After the above-mentioned tape is sealed, it looks like an ordinary printed tape from the surface. When the tape is peeled off, the transfer coating is separated from the other layer structures, and the anti-counterfeiting information of the holographic information layer not covered by the second composite coating is revealed, and it can no longer be restored to its original state, which has a very strong anti-counterfeiting effect.

[0004] In the above patented technology, when the tape is peeled off, the hidden anti-counterfeiting information is located on the tape, and no anti-counterfeiting information is revealed on the packaging. People are accustomed to discarding the peeled tape as waste and will neglect to observe whether there is hidden anti-counterfeiting information on the peeled tape. If the anti-counterfeiting information is revealed on the packaging after the tape is peeled off, it will be easier to be discovered.

[0005] Moreover, because PET material itself is very rigid, difficult to cut, and prone to warping after sealing, it cannot be used on a large scale on corrugated paper packaging. There is currently no BOPP peel-off and destruction tape. If a BOPP tape with a peel-off and destruction function is developed, it will undoubtedly greatly enhance the anti-counterfeiting performance of corrugated paper boxes. Summary of the invention

[0006] The purpose of the present invention is to provide a BOPP film revealing holographic anti-counterfeiting tape and a preparation method thereof, which will destroy the tape applied to BOPP material when it is revealed. The tape cannot be restored after being revealed, effectively preventing the tape from being revealed without damage, thereby improving the anti-counterfeiting performance of corrugated paper boxes.

[0007] The present invention is achieved through the following technical solutions: That is, a BOPP film revealing holographic anti-counterfeiting tape, characterized in that it includes a BOPP double-sided heat-sealed optical film with a single-sided corona, the corona surface is sequentially provided with a peeling release layer, a molded coating, a holographic image layer, a dense aluminum-plated layer, a support coating and an acrylic pressure-sensitive adhesive layer, and the other side is provided with a silicone oil release coating, the release force of the silicone oil release coating is smaller than the release force of the peeling release layer, the peeling release layer is hollowed out and partially coated on the corona surface, and the molded coating is fully printed.

[0008] The present invention coats silicone oil with low release force value on the front side of the tape, and when the roll is unrolled, the integrity of the appearance of the tape is maintained, and the peeled release layer can be coated with text, patterns or other preset anti-counterfeiting information, and the peeled release layer is a transparent layer. When the tape is not peeled off, the appearance of the tape is the same as that of an ordinary holographic anti-counterfeiting tape. After the tape is adhered to a corrugated paper box, when it is peeled off again, the release layer and the layers thereunder are peeled off and remain on the surface of the box, the appearance of the tape will be destroyed, and traces of the shape of the release layer will be left on the box. After the tape is peeled off, the hollow shape of the peeled release layer is displayed and cannot be restored, thereby effectively preventing the tape from being peeled off without damage.

[0009] Furthermore, the dense aluminum-plated coating of the present invention is a hollow dense aluminum-plated coating.

[0010] The hollow dense aluminum-plated layer can be produced by an aluminum washing process, so that the tape forms an appearance effect of partial aluminum and a positioning holographic image, thereby improving the decorative and anti-counterfeiting performance.

[0011] The BOPP double-sided heat-sealing optical film of the present invention has a thickness of 25-30 μm, a tensile strength MD of ≥140 MPa, and a TD of ≥250 MPa.

[0012] The silicone oil release coating of the present invention is a free radical UV organic silicone oil, preferably but not limited to the use of Evonik free radical system, which has the characteristics of low release force value.

[0013] Furthermore, the main resin of the release layer of the present invention adopts chloroacetic acid resin, which is dissolved in isopropyl alcohol, and the ratio of chloroacetic acid resin to isopropyl alcohol is 2.6:100. It has good fluidity and printing adaptability, and can be effectively transferred on non-corona BOPP light film by gravure printing, and can be imaged at low temperature, and will not be reversely sticky when winding, which is a key layer structure.

[0014] Chlorovinyl resin is generally used as a transfer material in combination with acrylic resin on the market. Using chlorovinyl resin alone will result in poor transfer. However, after testing, this patent found that after adding acrylic resin, the breaking force when peeling off is too large, and using chlorovinyl resin alone can meet the demand.

[0015] The chlorovinyl acetate resin of the present invention preferably adopts MC-42 resin.

[0016] The coating material of the molded coating of the present invention is a solvent-based transfer coating material, preferably TB-278AD coating material produced by Shantou Changfeng, which has good film-forming properties and can complete the presentation of the molded pattern at 155°C.

[0017] The aluminum plating layer of the present invention has a thickness of 200-300 angstroms.

[0018] The supporting coating of the present invention has a main resin of methyl acrylate polymer, which is doped with a small amount of polyvinyl alcohol system polymer, preferably WB-0215B coating produced by Shanghai Chengying. It has good adhesion to the BOPP film after corona treatment and has excellent shear performance, which is an important guarantee for the integrity of the font revealed by the tape.

[0019] The acrylic pressure-sensitive adhesive layer of the present invention has a solid content, an initial adhesive layer adhesion of ≥22 steel balls, and a 180° peeling strength of ≥0.26 KN / m.

[0020] A method for making a holographic anti-counterfeiting tape for revealing a BOPP film, characterized by the following steps: Step 1) Printing a release layer, and locally coating the release layer on the lower surface of the BOPP double-sided heat-sealed optical film; Step 2) Embossing holographic pattern: the film material prepared in step 1) is fully coated with the embossing coating, firstly passes through a preheating shaft to soften the film and the release layer, and then embossing the holographic nickel plate on the side of the release layer to form a holographic information layer. The embossing process requires online corona treatment; Step 3) Aluminum plating: vapor deposition is performed in a vacuum aluminum plating machine to form a dense aluminum plating layer on the corona surface; Step 4) applying a support coating; Step 5) The film material obtained in step 4) is produced on-line on a silicone coating machine, firstly through a silicone oil coating process, a silicone oil release coating is formed on the upper surface of the BOPP double-sided heat-sealed light film, and then an acrylic pressure-sensitive adhesive layer is coated on the other side of the film by a reverse kiss coating method, and a tape mother roll can be obtained after winding; Step 6) Divide the tape mother roll into discs to obtain the finished product.

[0021] The process of the present invention can be briefly described as follows: Locally coat and peel off the release layer on the BOPP heat-sealing optical film layer → emboss the holographic pattern → corona → aluminum plating → support layer coating → silicone oil coating → glue coating → slitting.

[0022] Furthermore, in step 2) of the above-mentioned production method of the present invention, after corona treatment, water-washable white ink is printed on the line, and the water-washable white ink is overlapped with the molded holographic image. In step 3), after aluminum plating, aluminum washing is performed on a water washing machine, and the aluminum layer in the area where the water-washable white ink is printed falls off, forming a hollow aluminum plating effect.

[0023] Furthermore, when the present invention prints the water-washable white ink online, the solid content of the water-washable white ink is 30%, and the registration error between the water-washable white ink and the holographic plate image is less than 0.5 mm.

[0024] Furthermore, when washing aluminum in the present invention, the temperature of the aluminum washing tank is 35°C, the temperature of the clean water tank is 35°C, the temperature of the oven is 90°C-90°C-90°C-90°C-90°C, and the vehicle speed is 50m / min.

[0025] Furthermore, in step 1) of the above-mentioned production method of the present invention, when the release layer is peeled off for printing, the solid content is 15.5%, a 200-mesh electric engraving anilox roller is used, and the wet glue amount is 2g / m 2 The printing temperature is 60℃-70℃-80℃-80℃-70℃, the speed is 80m / min, and make sure the release layer is centered when printing.

[0026] In step 2) of the above-mentioned production method of the present invention, the temperature of the preheated shaft is 115±5°C, the pressure during molding is 5kg, the corona value of the corona surface is greater than 42dyn, and the corona value of the non-corona surface is less than 32dyn.

[0027] In step 3) of the above-mentioned manufacturing method of the present invention, during aluminum plating, the high-purity aluminum wire is heated to 1700° C. in a vacuum state of 10 -3 -10 -4 Pa to vaporize, and then cooled to adhere to the film corona surface.

[0028] In step 4) of the above-mentioned preparation method of the present invention, when coating the support coating, the solid content on the machine is 28.5%, a 180-mesh ceramic anilox roller is used, and the wet glue amount is 8 g / m 2 , coating temperature is 90℃-100℃-100℃-100℃-70℃, vehicle speed is 80m / min, and full-plate coating.

[0029] Furthermore, in step 5) of the above-mentioned preparation method of the present invention, the dry silicon amount when applying silicone oil is 3g / m 2 , release force value 1.5-2g, UV power 5KW, solid content on the machine when coating acrylic pressure-sensitive adhesive layer 53±2%, Caien 2# cup, viscosity at 25℃ is 35 seconds, coating temperature 80℃-100℃-110℃-120℃-120℃-110℃-100℃-80℃, vehicle speed 80m / min.

[0030] In step 6) of the above-mentioned production method of the present invention, the speed of the dividing plate is 135m / min.

[0031] Compared with the prior art, the BOPP holographic tape that is destroyed when peeled off provided by the present invention adopts a BOPP material that is more suitable for box sealing in terms of substrate selection, and additionally realizes that after the BOPP box sealing tape is peeled off, the layers below the release layer are peeled off and remain on the surface of the corrugated box, and the remaining parts remain on the tape. The appearance of the tape will be destroyed, leaving a trace on the box. It integrates anti-counterfeiting and anti-counterfeiting and color decoration in one, and has the advantage of good anti-counterfeiting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the layer structure of the adhesive tape of Example 1 of the present invention; Figure 2 Schematic diagram of the layer structure of the adhesive tape according to Example 2 of the present invention.

[0033] As shown in the figure: 1. Silicone oil release coating; 2. BOPP heat-sealing optical film layer; 3. Peel off the release layer; 4. Molded coating; 5. Holographic image layer; 6. Dense aluminum coating; 7. Support coating; 8. Acrylic pressure-sensitive adhesive layer. DETAILED DESCRIPTION

[0034] The embodiments of the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and the protection scope of the present invention cannot be limited thereto. It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should be the common meanings understood by those skilled in the art to which the present invention belongs. Example 1

[0035] like Figure 1 As shown: the adhesive tape includes a silicone oil release coating 1, a BOPP heat-sealing optical film layer 2, a peel-off release layer 3, a molded coating 4, a holographic image layer 5, a dense aluminum-plated layer 6, a support coating 7 and an acrylic pressure-sensitive adhesive layer 8, which are arranged in sequence from bottom to top.

[0036] The method for manufacturing the above-mentioned adhesive tape comprises the following steps: Step 1: Print the peeling release layer 3 locally on the BOPP heat-sealing optical film layer 2. The shape of the peeling release layer 3 can be words, such as "opened". The main resin of the peeling release layer is chloroacetic resin, which is dissolved in isopropyl alcohol. The ratio of chloroacetic resin to isopropyl alcohol is 2.6:100. The solid content during printing is 15.5%, the 200-mesh electric engraving anilox roller, and the wet glue amount is 2g / m 2 , the printing temperature is 60-70-80-80-70℃, and the speed is 80m / min. When printing, make sure to peel off the release layer 3 in the center; Step 2, embossing holographic pattern, the film material prepared in step 1 is fully coated with embossing coating 4, and after being softened by a preheating shaft at 115°C, it is embossed on the holographic nickel plate with a pressure of 5kg and then separated and cooled immediately to form a holographic pattern layer 5. The embossing process requires online corona treatment, and the corona treatment is a single-sided corona treatment of the embossing surface, ensuring that the corona value of the corona surface is greater than 42dyn, and the corona value of the non-corona surface is less than 32dyn. The holographic nickel plate selected is a large snowflake plate; Step 3: Aluminum plating: a dense aluminum plating treatment is performed on the molded surface. A high-purity aluminum wire with a diameter of 1.5 mm and an alumina block with a size of 75 mm*75 mm*50 mm can be used. The Zhejiang Guangming brand can be used for evaporation in a vacuum aluminum plating machine. The high-purity aluminum wire is heated to about 1700°C under a vacuum state of 10-3 -10 -4 Pa to vaporize, and then cooled and attached to the film corona surface to form a dense aluminum plating layer 6. The thickness of the dense aluminum plating layer 6 is 250 angstroms. Step 4: Apply support coating 7, which has good adhesion to the corona-treated BOPP film and excellent trimming performance, which is an important guarantee for the integrity of the tape font. The machine solid content is 28.5%, 180 mesh ceramic anilox roller, and wet glue amount is 8g / m 2 , coating temperature is 90-100-100-100-70℃, speed is 80m / min, full-plate coating; Step 5, the film material with holographic image obtained in step 4 is produced on the integrated silicon coating machine, firstly through the silicone oil coating process, the dry silicon amount is 3g / m2, the release force value is measured between 1.5-2g, the UV power is 5KW, to form a silicone oil release coating 1, and then the acrylic pressure-sensitive adhesive layer 8 is coated on the line by reverse kiss coating, the solid content on the machine is 53±2%, the Cai En 2# cup, the viscosity at 25°C is 35 seconds, the coating temperature is 80-100-110-120-120-110-100-80°C, the speed is 80m / min, and the tape mother roll can be obtained after winding; Step six, the mother roll produced in step five is divided into reels, and the speed of the reel division machine is 135m / min.

[0037] After the adhesive tape of this embodiment is adhered to the corrugated box, when it is peeled off again, the layers below the release layer are peeled off and remain on the surface of the corrugated box, and the remaining parts are still on the adhesive tape. The appearance of the adhesive tape will be damaged, and there will be a hollow "opened" word on the adhesive tape, and a mark will also be left on the box. The above mark is the "opened" word, and the word will be visible after the adhesive tape is peeled off and cannot be restored, which effectively prevents the adhesive tape from being peeled off without damage. Example 2

[0038] like Figure 2 As shown: the dense aluminum-plated layer 6 in the layer structure of the tape in this embodiment has a hollow window, and the rest is the same as in Embodiment 1.

[0039] The manufacturing method of the adhesive tape of this embodiment comprises the following steps: Step 1: Print the peeling release layer 3 locally on the BOPP heat-sealing optical film layer 2. The shape of the peeling release layer 3 can be words, such as "opened". The main resin of the peeling release layer is chloroacetic resin, which is dissolved in isopropyl alcohol. The ratio of chloroacetic resin to isopropyl alcohol is 2.6:100. The solid content during printing is 15.5%, the 200-mesh electric engraving anilox roller, and the wet glue amount is 2g / m 2 , the printing temperature is 60-70-80-80-70℃, and the speed is 80m / min. When printing, make sure to peel off the release layer 3 in the center; Step 2, embossing holographic pattern, the film material prepared in step 1 is fully coated with embossing coating 4, after being softened by a preheating shaft at 115°C, it is embossed on the holographic nickel plate with a pressure of 5kg and then separated and cooled to form a holographic pattern layer 5, the embossing process requires online corona treatment, the corona treatment is a single-sided corona treatment of the embossing surface, ensuring that the corona value of the corona surface is greater than 42dyn, and the corona value of the non-corona surface is less than 32dyn, and then the water-washable white ink is printed online after corona treatment, the water-washable white ink is a water-soluble water-based paint, the brand is Shantou Fenghua BM-89, the solid content is 30%, the holographic nickel plate selects a positioning special plate, the water-washable ink and the holographic plate image must be aligned, and the alignment error is less than 0.5mm; Step 3: Aluminum plating: a dense aluminum plating treatment is performed on the molded surface. A high-purity aluminum wire with a diameter of 1.5 mm and an alumina block with a size of 75 mm*75 mm*50 mm can be used. The Zhejiang Guangming brand can be used for evaporation in a vacuum aluminum plating machine. The high-purity aluminum wire is heated to about 1700°C under a vacuum state of 10-3 -10 -4 Pa to vaporize, and then cooled and attached to the film corona surface to form a dense aluminum plating layer 6. The thickness of the dense aluminum plating layer 6 is 250 angstroms. Step 4: aluminum washing. The material prepared in step 3 is washed in a water washing machine. The water washing machine has an aluminum washing pool and a clean water pool. The temperature of the aluminum washing pool is 35°C, the temperature of the clean water pool is 35°C, the temperature of the oven is 90-90-90-90-90°C, and the speed is 50m / min. After the aluminum washing process, the aluminum layer in the area where the water-washing ink is printed is removed as the water-washing ink is dissolved, leaving only the aluminum layer without the water-washing ink printed, forming an appearance effect with partial aluminum and a positioning holographic image; Step 5: Apply support coating 7, which has good adhesion to the corona-treated BOPP film and excellent trimming performance, which is an important guarantee for the integrity of the tape font. The machine solid content is 28.5%, 180 mesh ceramic anilox roller, and wet glue amount is 8g / m 2 , coating temperature is 90-100-100-100-70℃, speed is 80m / min, full-plate coating; Step six, the film material with holographic image obtained in step four is produced on the integrated silicon coating machine, firstly through the silicone oil coating process, the dry silicon amount is 3g / m2, the release force value is measured between 1.5-2g, the UV power is 5KW, to form a silicone oil release coating 1, and then the acrylic pressure-sensitive adhesive layer 8 is coated on the line by reverse kiss coating, the solid content on the machine is 53±2%, the Cai En 2# cup, the viscosity at 25°C is 35 seconds, the coating temperature is 80-100-110-120-120-110-100-80°C, the speed is 80m / min, and the tape mother roll can be obtained after winding; Step seven, the mother roll produced in step six is ​​divided into reels, and the speed of the reel division machine is 135m / min.

[0040] This embodiment is used in the same manner as the first embodiment, except that the adhesive tape forms an appearance effect in which aluminum is partially present and a positioning holographic image is provided, and the decorative and anti-counterfeiting properties are better.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and should all be included in the scope of the claims and specification of the present invention.

Claims

1. A holographic anti-counterfeiting tape that reveals BOPP film, characterized in that The invention comprises a BOPP double-sided heat-sealed optical film with a single-sided corona, wherein a peeling release layer, a molded coating, a holographic image layer, a dense aluminum-plated layer, a support coating and an acrylic pressure-sensitive adhesive layer are sequentially arranged on the corona surface, and a silicone oil release coating is arranged on the other side. The release force of the silicone oil release coating is smaller than the release force of the peeling release layer. The peeling release layer is hollowed out and partially coated on the corona surface, and the molded coating is fully printed.

2. The holographic anti-counterfeiting tape for revealing BOPP film according to claim 1, characterized in that The dense aluminum plating layer is a hollow dense aluminum plating layer.

3. The holographic anti-counterfeiting tape for revealing BOPP film according to claim 1, characterized in that The main resin for peeling off the release layer is chloroacetic acid resin, which is dissolved in isopropyl alcohol, and the ratio of chloroacetic acid resin to isopropyl alcohol is 2.6:

100.

4. A method for making a BOPP film revealing holographic anti-counterfeiting tape according to claim 1, characterized in that Here are the steps: Step 1) Printing a release layer, and locally coating the release layer on the lower surface of the BOPP double-sided heat-sealed optical film; Step 2) Embossing holographic pattern: the film material prepared in step 1) is fully coated with the embossing coating, firstly passes through a preheating shaft to soften the film and the release layer, and then embossing the holographic nickel plate on the side of the release layer to form a holographic information layer. The embossing process requires online corona treatment; Step 3) Aluminum plating: vapor deposition is performed in a vacuum aluminum plating machine to form a dense aluminum plating layer on the corona surface; Step 4) applying a support coating; Step 5) The film material obtained in step 4) is produced on-line on a silicone coating machine, firstly through a silicone oil coating process, a silicone oil release coating is formed on the upper surface of the BOPP double-sided heat-sealed light film, and then an acrylic pressure-sensitive adhesive layer is coated on the other side of the film by a reverse kiss coating method, and a tape mother roll can be obtained after winding; Step 6) Divide the tape mother roll into discs to obtain the finished product.

5. The method for making a holographic anti-counterfeiting tape for revealing a BOPP film according to claim 4, characterized in that In step 2), after corona treatment, washed white ink is printed on the line, and the washed white ink is superimposed on the molded holographic image. In step 3), after aluminum plating, aluminum washing is performed on a water washing machine, and the aluminum layer of the area printed with washed white ink falls off, forming a hollow aluminum plating effect.

6. The method for making a holographic anti-counterfeiting tape for revealing a BOPP film according to claim 4, characterized in that When the release layer is peeled off and printed in step 1), the solid content is 15.5%, a 200-mesh electric engraving anilox roller is used, and the wet glue amount is 2g / m 2 The printing temperature is 60℃-70℃-80℃-80℃-70℃, the speed is 80m / min, and make sure the release layer is centered when printing.

7. The method for making a holographic anti-counterfeiting tape for revealing a BOPP film according to claim 4, characterized in that In step 4), the solid content of the support coating was 28.5%, a 180-mesh ceramic anilox roller was used, and the wet glue amount was 8 g / m 2 , coating temperature is 90℃-100℃-100℃-100℃-70℃, vehicle speed is 80m / min, and full-plate coating.

8. The method for making a BOPP film revealing holographic anti-counterfeiting tape according to claim 4, characterized in that In step 5), the dry silicone amount when applying silicone oil is 3g / m 2 , release force value 1.5-2g, UV power 5KW, solid content on the machine when coating acrylic pressure-sensitive adhesive layer 53±2%, Caien 2# cup, viscosity at 25℃ is 35 seconds, coating temperature 80℃-100℃-110℃-120℃-120℃-110℃-100℃-80℃, vehicle speed 80m / min.

9. The method for making a BOPP film revealing holographic anti-counterfeiting tape according to claim 5, characterized in that The solid content of the water-washable white ink is 30%, and the registration error between the water-washable white ink and the holographic plate image is less than 0.5mm.

10. The method for making a BOPP film holographic anti-counterfeiting tape according to claim 5, characterized in that When washing aluminum, the temperature of the aluminum washing pool is 35°C, the temperature of the clean water pool is 35°C, the temperature of the oven is 90°C-90°C-90°C-90°C-90°C, and the vehicle speed is 50m / min.

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