CN115723361A - Production process of high-brightness and brightness film - Google Patents
Production process of high-brightness and brightness film Download PDFInfo
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- CN115723361A CN115723361A CN202211382048.4A CN202211382048A CN115723361A CN 115723361 A CN115723361 A CN 115723361A CN 202211382048 A CN202211382048 A CN 202211382048A CN 115723361 A CN115723361 A CN 115723361A
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Abstract
The invention provides a production process of a high-whiteness and brightness film, which comprises the steps of photoetching a nickel plate to prepare V-shaped concave line arranged in parallel, and sticking the nickel plate on the surface of a cylindrical printing roller to form a brightening printing roller; applying a transparent coating layer having a surface tension greater than 42 dyne on the base film; the method comprises the steps of coating a transparent coating with a blue UV coating obtained by uniformly stirring the UV coating and a blue dye, precuring under the irradiation of ultraviolet light, rolling a brightening roller to transfer the V-shaped concave line of the brightening roller to a UV glue layer to form a convex triangular prism line when the coating is not completely cured, curing by ultraviolet light, and forming a light blue UV coating and a triangular prism convex line with a proper distance on the surface of a film to improve the brightness and whiteness of the film.
Description
Technical Field
The invention relates to a manufacturing method of a plastic film, in particular to a production process capable of improving the whiteness and brightness of the plastic film.
Background
The widely used high whiteness and brightness film is prepared by coating and coloring zinc sulfide on Polyester (PET) or biaxially oriented polypropylene (BOPP) base film by high-temperature evaporation and multilayer compounding. The glitter powder processed by the film has stereoscopic impression, can enhance the visual effect of products, has the characteristic of high flashing, makes ornaments bright and attractive, and adds luster, so that the glitter powder is widely applied to the fields of Christmas handicraft, cosmetics and the like. However, the high-whiteness and brightness film has the defects of complex manufacturing process, higher production cost, poorer controllability of evaporated zinc sulfide, uneven coating and the like.
CN102176082A discloses a method for producing a reflective membrane with a microprism array structure, which adopts an annular mould reciprocating along a closed loop, the outer surface of the annular mould is provided with a continuous microprism array structure in a concave shape, one side surface of a resin film is coated with a layer of hot melt resin, then the resin film, the hot melt resin and the annular mould are synchronously pressed, and then the resin film coated with the hot melt resin and the annular mould are synchronously cooled, so that the resin film coated with the hot melt resin and the microprism array structure on the hot melt resin layer jointly form a laminated membrane. However, the product microprism has overlarge density, relatively serious light interference and obvious five-color, so the product microprism is only used as a five-color reflective film, does not have the whitening performance, the reflective film is easy to accumulate dust or pollute foreign matters, the prism surface needs to be protected by modes such as evaporation and the like, and the production efficiency is low because the film and the annular die are synchronously cooled.
CN103192554A discloses a method for manufacturing a microprism reflective film, which comprises performing corona treatment on the surface of a substrate, making a UV resin into a microprism pyramid, and fixing the bottom surface of the microprism pyramid on the surface of the substrate by photo-curing and rapid drying. However, the product microprism has overlarge density, relatively serious light interference and obvious multicolored color, so the product is only used for a multicolored reflective film and does not have the whitening performance, and due to the timeliness of corona effect, the bonding force of the UV material and PET can be gradually attenuated, so that local peeling and layering are caused, namely, the foaming phenomenon.
CN105372733A discloses a reflective film with a moth-eye structure and a preparation process thereof, wherein the reflective film comprises a PET layer, a reflective structure layer, and a moth-eye antireflection structure layer. The light reflecting structure layer adopts a pyramid structure with three mutually vertical surfaces as the light reflecting structure by means of the geometrical optics principle. The moth-eye antireflection structure layer adopts a moth-eye-like micro-nano structure as an antireflection layer by means of a bionics principle. The product microprism has overlarge density, relatively serious light interference and obvious multicolour color, so the product is only used for a multicolour reflective film, does not have the whitening performance, and has complex structure and low production efficiency.
Disclosure of Invention
The invention aims to provide a production process of a high-whiteness and brightness film, which improves the brightness and whiteness of the film by forming a light blue UV coating and triangular prism convex lines with proper intervals on the surface of the film.
The production process of the high-whiteness and brightness film comprises the following steps:
A. photoetching a nickel plate to prepare V-shaped concave lines which are 10-20 mu m in width, 0.5-1 time in depth and 2-4 times in distance, and attaching the nickel plate to the surface of a cylindrical plate roller to form a brightening plate roller;
B. preparing the UV coating: mixing and uniformly stirring the UV coating and the blue dye according to the weight ratio of 100: 5-20 to obtain a blue UV coating;
C. coating a transparent coating layer with surface tension greater than 42 dyne on the base film;
D. and coating the blue UV coating on the transparent coating of the base film, performing precuring under the irradiation of ultraviolet light, when the coating is not completely cured, rolling the V-shaped concave line of the brightening roller by the brightening roller to transfer the V-shaped concave line to the UV adhesive layer to form a convex triangular prism line, and curing by the ultraviolet light to form the high-whiteness and high-brightness film.
Preferably, in the step a, the V-shaped concave line depth is 0.6 to 0.7 times the width, and the distance is 2.5 to 3.5 times the width.
Preferably, in the step B, the weight ratio of the UV coating to the blue dye is 100: 10-15.
Preferably, in the step C, the base film is a polyester film or a biaxially oriented polypropylene film; the thickness of the transparent coating is 0.5-20 μm; the transparent coating is a water-based acrylic emulsion coating, and the coating weight after drying is 0.7-0.9 g/M 2 Or the transparent coating is an adhesive glue layer with the thickness of 0.3-20 mu m.
Preferably, in the step D, the blue UV coating is subjected to a preheating treatment at 50 ± 2 ℃ before being applied to the base film.
The invention improves the light reflection effect of the surface of the film and reduces the light interference effect by forming the light blue UV coating and the triangular prism convex line on the surface of the film and reducing the density of the prism line and the light blue coating, so that the film surface can display the white rather than multicolored visual effect when being observed from a wide angle.
Drawings
Figure 1 is a partial cross-sectional view of a brightness enhancing master.
FIG. 2 is a schematic diagram of a thin film coating architecture.
Detailed Description
Example 1
The present embodiment adopts a commercial precoating film as a substrate for UV coating processing, and the product process route is as follows: pre-coating a film, coating a UV layer, UV mould pressing, cutting and packaging.
A metal nickel plate with the length and width of 100 multiplied by 100mm and the thickness deviation not exceeding 1.5 mu m is taken, a parallel concave part line 1 (shown in figure 1) with a V-shaped section is manufactured by a photoetching method, the width a =15 mu m above the concave part, the depth h =10 mu m, the platform width b =50 mu m between the concave part lines, the whole layout is required to be neat, no defects such as pinhole points and the like exist, and the metal nickel plate becomes a small-unit brightening master plate.
And (3) adhering a plurality of small unit brightening mother plates on a substrate and splicing the small unit brightening mother plates into a mould pressing working plate, controlling the thickness of the mould pressing working plate to be about 50 mu m, calculating the length and width required by the mould pressing working plate according to the product specification and equipment parameters to cut the plate, and adhering the plate to the surface of the matched cylindrical plate roller to form the brightening template.
Selecting a pre-coating film: the coating is prepared from a commercial precoating film consisting of a Polyester (PET) substrate and an adhesive glue layer, wherein the thickness of the PET film is 22-24 mu m, the thickness of the adhesive glue layer is 0.3-0.5 mu m, and the surface tension of the coating is about 52 dynes. The precoating film has commercial application of being compounded with paper printing products, improving the glossiness and fastness of the printing products, and playing roles in water resistance, stain resistance, wear resistance, crease resistance, chemical corrosion resistance and the like.
Preparing a UV coating: preparing a blue slurry from a UV coating of a model B-5 produced by Shantou Dongfeng printing stock Co., ltd and a Victoria blue dye produced by Fujian Kuncun color materials science and technology stock Co., ltd according to a weight ratio of 100: 5, stirring the blue slurry on an automatic stirrer for more than 2 hours, mixing the UV coating and the blue slurry according to a weight ratio of 100: 6, and stirring the mixture at a constant temperature of 50 ℃ for 1 hour to obtain the on-board used blue UV coating. The viscosity of the blue UV coating used on the machine is 65-85 centipoises.
And (3) coating the blue UV coating used on the machine on the adhesive layer of the pre-coating film through a gravure roller press, wherein the coating roller is a rhombic honeycomb gravure, the depth of a roller mesh is about 50 mu m, and the width of the roller mesh is about 45 mu m.
Pre-curing the pre-coated film coated with the blue UV coating by ultraviolet irradiation, wherein the power of an ultraviolet lamp for pre-curing is 12KW, drying the PET film coated with the blue UV coating at 50-60 ℃ at a speed of 40-60M/min, irradiating by an ultraviolet lamp, and rolling the PET film coated with the blue UV coating by a brightening plate roller by adopting a cold transfer technology under the condition that a finger mark still exists in an incompletely cured state when the surface of the coating is pressed by a finger. The rolling pressure of the brightening plate roller is 0.33MPa, and the brightening plate roller is circularly cooled by cooling water with the temperature of 20 +/-2 ℃. The rolled film is further solidified by ultraviolet irradiation, and then is cut and packaged into a finished film product.
The structure of the finished product is shown in figure 2, and comprises a base film 1, a transparent coating 2 above the base film 1, and a UV coating 3 on the transparent coating 2, wherein the UV coating 3 is provided with convex prism lines, and the surfaces of the prisms and the planes between the prisms are light reflecting surfaces, so that the finished product shows higher whiteness and brightness. The film is observed in a large angle range from the surface of the film, and because the reflected light of the prism has enough distance with the adjacent prism, the light interference phenomenon does not occur, so the multicolored visual effect after the light interference does not occur.
The samples were placed on A4 paper and measured with an alice color difference instrument Ci6X, with L values of 101.66, a values of-0.06, b values of-0.05, and the measured values for the A4 paper used were: l value 90.85, a value 1.07, b value-6.28, the large variation in L, a and b values indicates that the product has higher brightness and whiteness. No blistering was observed after the product was subjected to a 24-month natural sun exposure aging test, indicating that no delamination occurred between the composite layers.
Example 2
The present example uses Polyester (PET) film as the substrate, and the product process route is as follows: PET base film-bottom coating-UV layer coating-UV mould pressing-cutting-packaging.
A metal nickel plate with the length and width of 100 multiplied by 100mm and the thickness deviation not exceeding 1.5 mu m is taken, parallel concave part lines with V-shaped cross sections are manufactured by a photoetching method, the width a =15 mu m above the concave part, the depth h =10 mu m, the width b =45 mu m of a platform between the concave part lines (shown in figure 1), the whole layout is required to be neat, no defects such as pinhole points and the like exist, and the metal nickel plate becomes a small-unit brightening master plate.
And (3) adhering a plurality of small unit brightening master plates to a substrate and splicing to form a mould pressing working plate, wherein the thickness of the mould pressing working plate is controlled to be about 50 mu m. And calculating the length and width required by the mould pressing working plate according to the product specification and equipment parameters to cut the plate, and attaching the plate to the surface of the matched cylindrical plate roller to form the brightening plate roller.
Coating a layer of water-based acrylic emulsion paint on a Polyester (PET) film, wherein the diluent is alcohol and deionized water, the solid content is 20wt%, the viscosity of the paint is 10-40 centipoises, and the wet coating amount is controlled to be 3.5-4.5 g/M 2 The drying temperature is controlled at 90-120 ℃, the production speed is 100m/min, the thickness of the coating after drying is about 0.8 mu m, and the surface tension of the coating is about 45 dynes.
Preparing the UV coating: preparing a blue slurry from UV paint of type B-5 produced by Shantou Dongfeng printing company Limited and a Victoria blue dye produced by Fujian KunCao science and technology company Limited according to a weight ratio of 100: 5, and stirring for more than 2 hours on an automatic stirrer; and mixing the UV coating and the blue slurry according to the weight ratio of 100: 6, and stirring at the constant temperature of 50 ℃ for 1 hour to obtain the on-machine blue UV coating. The viscosity of the blue UV coating used on the machine is 65-85 centipoises.
The blue UV coating used on the machine is coated on the acrylic emulsion coating through a gravure roller, the coating roller is a rhombic honeycomb gravure, the depth of a roller cell is about 50 mu m, and the width of the roller cell is about 45 mu m.
Irradiating the PET film coated with the blue UV coating by using ultraviolet light for precuring, wherein the power of an ultraviolet lamp for precuring is 12KW, irradiating the PET film coated with the blue UV coating by using the ultraviolet lamp at the speed of 40-60M/min, rolling the PET film coated with the blue UV coating by using a brightening roller under the condition of incomplete curing state when fingers press the surface of the coating, wherein fingerprints exist, and the rolling pressure of the brightening roller is 0.35MPa, circularly cooling the brightening roller by using cooling water at the temperature of 20 +/-2 ℃, drying at the temperature of 50-60 ℃, further curing by using ultraviolet light for irradiation, slitting and packaging to obtain a finished film.
The structure of the prepared product is the same as that of the product in the example 1 (shown in figure 2), and the prepared product shows higher whiteness and brightness, and also has the colorful visual effect after light interference. The samples were placed on A4 paper and measured with an alice color difference instrument Ci6X, with L values of 99.57, a values of-0.06, b values of-0.33, and the measured values for the A4 paper used were: l value 90.85, a value 1.07, b value-6.28, the large variation in L, a and b values indicates that the product has higher brightness and whiteness. No foaming phenomenon is observed after the product is subjected to a natural sunshine insolation aging test for 24 months, which indicates that the peeling between the composite layers does not occur.
Claims (8)
1. A process for producing a high-brightness and luminance film, comprising the steps of:
A. photoetching a nickel plate to prepare V-shaped concave lines which are 10-20 mu m in width, 0.5-1 time in depth and 2-4 times in distance, and attaching the nickel plate to the surface of a cylindrical plate roller to form a brightening plate roller;
B. preparing the UV coating: mixing and uniformly stirring the UV coating and the blue dye according to the weight ratio of 100: 5-20 to obtain a blue UV coating;
C. applying a transparent coating layer having a surface tension greater than 42 dyne on the base film;
D. and coating the blue UV coating on the transparent coating of the base film, performing precuring under the irradiation of ultraviolet light, when the coating is not completely cured, rolling the V-shaped concave line of the brightening roller by the brightening roller to transfer the V-shaped concave line to the UV adhesive layer to form a convex triangular prism line, and curing by the ultraviolet light to form the high-whiteness and high-brightness film.
2. The process of claim 1, wherein in step A, the depth of the V-shaped recess line is 0.6 to 0.7 times the width and the distance is 2.5 to 3.5 times the width.
3. The process according to claim 1 or 2, wherein in step B, the weight ratio of the UV coating to the blue dye is 100: 10-15.
4. The process of claim 1, wherein in the step C, the base film is a polyester film or a biaxially oriented polypropylene film.
5. The process of claim 4, wherein in step C, the thickness of the transparent coating is 0.5 to 20 μm.
6. The process according to claim 4 or 5, wherein in the step C, the transparent coating is an aqueous acrylic emulsion coating, and the coating weight after drying is 0.7-0.9 g/M 2 。
7. The process according to claim 4 or 5, wherein in step C, the transparent coating layer is an adhesive glue layer with a thickness of 0.3-20 μm.
8. The process as claimed in claim 1, wherein the blue UV coating is preheated at 50 ± 2 ℃ before being applied on the base film in the step D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211382048.4A CN115723361A (en) | 2022-11-07 | 2022-11-07 | Production process of high-brightness and brightness film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211382048.4A CN115723361A (en) | 2022-11-07 | 2022-11-07 | Production process of high-brightness and brightness film |
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| Publication Number | Publication Date |
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| CN115723361A true CN115723361A (en) | 2023-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211382048.4A Pending CN115723361A (en) | 2022-11-07 | 2022-11-07 | Production process of high-brightness and brightness film |
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| CN (1) | CN115723361A (en) |
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- 2022-11-07 CN CN202211382048.4A patent/CN115723361A/en active Pending
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