Pearlescent printing product and printing process

Abstract

The invention relates to a pearlescent printing product and a printing technology, the pearlescent printing product comprises a plastic injection molding part and a pearlescent layer, the pearlescent layer is formed on the surface of the plastic injection molding part through the printing technology, the pearlescent layer comprises pearlescent pigment particles, and the pearlescent pigment particles form patterns on the pearlescent layer. The pattern comprises a point A, a detection area M and a detection area N which can detect the pattern are randomly selected around the pattern, the brightness of the point A detected from the detection area M is L1, the brightness of the point A detected from the detection area N is L2, and L1 and L2 are not equal. The pearlescent printing product can present different brightness in different areas and different visual angles, and has a flashing effect, so that the attractiveness of the surface of the product is improved.

Description

Technical Field

[0001] The present application relates to cosmetic packaging technology, and in particular to a pearlescent printing product and printing process. Background Art

[0002] Traditional water-based ink printing is widely used in the packaging industry. Water-based ink is referred to as water-based ink, which is composed of water-soluble or water-dispersible polymer resin as a binder, organic pigments, solvent water and related additives. The main difference between water-based ink and oil-based ink is that solvent-based ink uses organic solvents as solvents, while water-based ink uses water as solvent. Therefore, water-based ink is more popular due to its extremely low VOC content, low toxicity and non-flammability. As a "green printing" material, it has developed rapidly in the flexible packaging and food packaging printing industries. However, the cosmetic packaging products printed with traditional water-based inks have dull patterns on the surface of the products, which lack appeal to consumers. Summary of the invention

[0003] In order to overcome the above-mentioned defects, the present application provides a pearlescent printing product, which can present different brightness in different areas and at different viewing angles and has a flashing effect, thereby improving the aesthetics of the product surface.

[0004] The technical solution adopted by this application to solve its technical problems is:

[0005] A pearlescent printing product comprises a plastic injection molded part and a pearlescent layer, wherein the pearlescent layer is formed on the surface of the plastic injection molded part by a printing process, the pearlescent layer comprises pearlescent pigment particles, the pearlescent pigment particles form a pattern on the pearlescent layer, the pattern comprises a point A, and two detection areas M and N are randomly selected around the pattern where the pattern can be detected, the brightness of point A detected from the detection area M is L1, the brightness of point A detected from the detection area N is L2, and L1 and L2 are not equal.

[0006] Optionally, a detection area P around the pattern where a pattern can be detected is used to detect the pattern, the pattern includes a bright spot B and a dark spot C, and the brightness of the bright spot B is greater than the brightness of the dark spot C; a detection area Q around the pattern where a pattern can be detected is used to detect the pattern, the brightness of the bright spot B is less than the brightness of the dark spot C, and the detection area Q does not overlap with the detection area P.

[0007] Optionally, the pearlescent layer further comprises a varnish layer, which covers the pearlescent pigment particles and fixes the pearlescent pigment particles in the pearlescent layer.

[0008] Optionally, a protective layer is further included, and the protective layer covers the pearlescent layer.

[0009] Optionally, the pearlescent pigment particles include at least one of pearlescent powder and onion powder.

[0010] Optionally, the pearlescent pigment particles have a particle size of 80 μm to 800 μm.

[0011] Optionally, the particle size of the pearlescent pigment particles is 250 μm or 380 μm.

[0012] Optionally, the pearlescent layer comprises the following raw materials in parts by weight: 5-20 parts of pearlescent pigment particles, 10-60 parts of varnish and 0.1-5 parts of curing agent.

[0013] Optionally, the mass ratio of the pearlescent pigment particles to the varnish is 1:1.5 to 1:4, and the percentage of the curing agent in the total mass of the pearlescent layer raw material is 3-6%.

[0014] Optionally, the pearlescent layer further comprises the following raw materials in parts by weight: 0.01-1 part of optically variable powder.

[0015] The present application also provides a pearlescent printing process for producing the pearlescent printed product, comprising the following steps:

[0016] Preparation of coating: weigh the pearlescent pigment particles, varnish and curing agent in the formula, stir evenly to obtain the pearlescent coating;

[0017] Plate making: Make a screen with a pattern through the photosensitive plate making method, and install the screen on the printing equipment;

[0018] Screen printing: Use the plastic injection molded part as the substrate of the printing equipment, then pour the pearlescent paint on the front end of the screen of the screen, use the scraper to give downward pressure to the screen, and squeeze the pearlescent paint on the screen through the mesh of the screen to the surface of the plastic injection molded part;

[0019] Drying: Take out the printed plastic injection molded parts, put them in the drying equipment to dry and solidify them to form a pearlescent layer, and obtain the pearlescent printed products;

[0020] Cutting: Trim the pearlescent printed products to obtain the finished product.

[0021] Optionally, the plate making process comprises the following steps:

[0022] Stretching the screen: put the screen frame on the stretching machine, select the mesh cloth with the required mesh size to stretch the screen, and make the screen plate;

[0023] Edge tape: Use tape to seal the edges of the screen;

[0024] Cleaning the screen: Use a degreasing agent to clean the screen;

[0025] Bake the screen: Put the cleaned screen into the oven to bake;

[0026] Screen gluing: Scrape photosensitive glue on the front and back of the dried screen;

[0027] Drying the screen: Use 3M tape to stick the film on the back of the screen glue, and then place it on the glass of the exposure machine for exposure;

[0028] Development in water: After exposure, remove the film, put the screen into water for development, and then put it into the oven for drying;

[0029] Inspection and repair: inspect and repair the dried screen;

[0030] Exposure for firmness: Place the repaired screen back on the platesetting machine and expose both the front and back sides to increase the firmness of the draft.

[0031] Optionally, the screen gluing process includes the following steps:

[0032] First gluing: pour the photosensitive glue into the scraper, place the screen on a wooden frame with an angle, use the scraper to scrape the glue on the back and front of the screen for the first time, and then put it in the oven to dry;

[0033] Second gluing: After the dried screen is glued for the second time, it is placed in the oven for drying;

[0034] Third gluing: After the dried screen is glued for the third time, it is placed in the oven for drying.

[0035] The beneficial effects of the present application are as follows: the present application prints a pearlescent layer on a plastic injection molded part, and the pearlescent pigment particles in the pearlescent layer form a pattern, the shape and color of the pattern can be designed as required, the pearlescent pigment particles in the pearlescent layer are bright in color, and the product can present different brightness in different areas and different viewing angles, and has a flashing effect, thereby improving the aesthetics of the product surface. In the present application, by controlling the particle size of the pearlescent pigment particles, the brightness of the pearlescent layer is improved, and a local flashing effect is produced, making the product more beautiful; by controlling the ratio of the pearlescent pigment particles to the varnish in the pearlescent layer, different brightness and different flashing effects are presented. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the structure of the pearlescent printing product in Example 1 of the present application;

[0037] Figure 2 This is a schematic diagram of the structure of the pearlescent printing product in Example 4 of the present application;

[0038] In the figure: 10 - plastic injection molded part, 20 - pearlescent layer, 30 - protective layer. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the embodiments of the present application. Obviously, the embodiments described in the present application are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the following drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0042] like Figure 1As shown, a pearlescent printing product includes a plastic injection molded part 10 and a pearlescent layer 20. The pearlescent layer 20 is formed on the surface of the plastic injection molded part 10 by a printing process. The pearlescent layer 20 includes pearlescent pigment particles. The pearlescent pigment particles form a pattern on the pearlescent layer 20. The pattern includes a point A. Two detection areas M and N around the pattern where the pattern can be detected are randomly selected. The brightness of point A detected from detection area M is L1, and the brightness of point A detected from detection area N is L2. L1 and L2 are not equal. That is, any point A on the pattern has different brightness when viewed from two different viewing angles. Among them, the plastic injection molded parts include cosmetic packaging materials, base paper, plastic-coated paper, polyethylene terephthalate film PET, triacetate film TAC, polyvinyl chloride film PVC, polyethylene film PE, polycarbonate film PC, polyethylene naphthalate film PEN, etc. The material of the cosmetic packaging material includes at least one of polypropylene PP, polyethylene PE, polyvinyl chloride PVC and polyvinyl alcohol, and the pattern includes various graphics, letters, numbers, textures, etc. The present application prints a layer of pearlescent layer 20 on the plastic injection molded part 10, and the pearlescent pigment particles in the pearlescent layer 20 form a pattern. The shape and color of the pattern can be designed according to needs. The pearlescent pigment particles of the pearlescent layer are bright in color, and the product can present different brightness in different areas and different viewing angles, and has a flashing effect, thereby improving the aesthetics of the product surface.

[0043] The pattern is detected in the detection area P around the pattern where the pattern can be detected. The pattern includes bright spots B and dark spots C, and the brightness of bright spots B is greater than the brightness of dark spots C. The pattern is detected in the detection area Q around the pattern where the pattern can be detected. The brightness of bright spots B is less than the brightness of dark spots C, and the positions of detection areas Q and P do not overlap. That is, from any angle around the pattern, the pattern includes at least two bright spots of different brightness. Optionally, the pattern includes multiple bright spots of different brightness, making the product surface colorful.

[0044] The pearlescent layer 20 also includes a varnish layer, which covers the pearlescent pigment particles and fixes the pearlescent pigment particles in the pearlescent layer. The varnish is cured under the action of the curing agent and fixes the pearlescent pigment particles on the surface of the plastic injection molded part 10, so that the pearlescent pigment particles will not fall off the plastic injection molded part 10.

[0045] like Figure 2 As shown, the pearlescent printing product further includes a protective layer 30, which covers the pearlescent layer 20. The protective layer includes a polyurethane film, a polyvinyl acetate film, an acrylic copolymer film, etc. The protective layer is used to prevent the pearlescent layer from falling off and has a wear-resistant function. The protective layer is a transparent protective layer, so it will not affect the effect of the pearlescent layer. Optionally, the light transmittance of the protective layer is ≥92% and the surface roughness Ra is ≤8μm.

[0046] The pearlescent pigment particles include at least one of pearlescent powder and onion powder. Optionally, the pearlescent powder includes at least one of silver white pearlescent powder, metallic pearlescent powder, mica iron pearlescent powder and iridescent interference color, and the onion powder includes at least one of glitter powder and silver onion powder.

[0047] Pearlescent pigments such as pearl powder or onion powder can improve the flash effect. In order to present the expected effect, pearlescent pigment particles of suitable particle size must be selected. Optionally, the particle size of the pearlescent pigment particles is 80μm to 800μm. Optionally, the particle size of the pearlescent pigment particles is 150μm to 500μm. The particle size of the pearlescent pigment particles corresponds to the mesh number, which is the number of holes, referring to the number of holes per square inch on the screen. The larger the mesh number, the smaller the aperture. Generally speaking, the mesh number multiplied by the aperture (micrometer number) = 15000. For example, the diameter of 400 mesh particles is about 38 microns, the diameter of 500 mesh particles is about 30 microns, the diameter of 60 mesh particles is 250 microns, and the diameter of 40 mesh particles is 380 microns. Optionally, the particle size of the pearlescent pigment particles is 20 mesh, 25 mesh, 30 mesh, 35 mesh, 40 mesh, 45 mesh, 50 mesh or 60 mesh.

[0048] Optionally, the particle size of the pearlescent pigment particles is 250 μm or 380 μm, that is, the particle size of the pearlescent pigment particles is 60 mesh or 40 mesh. Selecting pearlescent pigment particles with a diameter of 40 mesh or 60 mesh can improve the brightness of the pearlescent layer and produce a local flashing effect, making the product more beautiful.

[0049] The pearlescent layer includes the following raw materials in parts by weight: 5-20 parts of pearlescent pigment particles, 10-60 parts of varnish and 0.1-5 parts of curing agent. The curing agent is selected from at least one of polyisocyanates, aziridines, fatty amines, aromatic amines, polyamides and imidazoles. When printing the pearlescent layer, firstly prepare the pearlescent coating, then print the pearlescent coating on the plastic injection molded part 10, and use UV light to cure the pearlescent coating to obtain the pearlescent layer, and the power of UV light curing is 900W to 1500W. The raw materials of the pearlescent coating include pearlescent pigment particles, varnish and curing agent. When preparing, weigh the pearlescent pigment particles, varnish and curing agent in the formula amount, stir evenly to obtain the pearlescent coating.

[0050] Optionally, the mass ratio of pearlescent pigment particles to varnish is 1:1.5 to 1:4, and the curing agent accounts for 3-6% of the total mass of the raw materials of the pearlescent layer. Optionally, the mass ratio of pearlescent pigment particles to varnish is 1:2 to 1:3, and the curing agent accounts for 5% of the total mass of the raw materials of the pearlescent layer.

[0051] The pearlescent layer also includes the following raw materials in parts by weight: 0.01-1 part of light-changing powder. The light-changing powder will change color under ultraviolet light or sunlight. When the ultraviolet light and sunlight are gone, the color of the product returns to its original color. The light-changing powder includes photosensitive blue, photosensitive yellow, photosensitive red, and photosensitive purple. The light-changing powder can change the product from colorless to colored, or from one color to another. In the present application, adding light-changing powder to the pearlescent layer can diversify the product, improve the interest of the product, and increase the product's attractiveness to consumers.

[0052] Preparation and result analysis of the embodiments:

[0053] Example 1: Weigh 5g of 60-mesh silver onion powder, 15g of varnish and 1g of polyisocyanate curing agent, stir evenly to obtain pearlescent coating, then screen print the pearlescent coating on the plastic injection molded part 10, and form a pearlescent layer 20 after curing. Figure 1 shown.

[0054] Example 2: Weigh 5 g of 40-mesh silver onion powder, 15 g of varnish and 1 g of polyisocyanate curing agent, stir evenly to obtain pearlescent coating, and then screen print the pearlescent coating on the plastic injection molded part 10, and form a pearlescent layer 20 after curing.

[0055] Example 3: Weigh 5 g of 40-mesh silver onion powder, 10 g of varnish and 1 g of polyisocyanate curing agent, stir evenly to obtain pearlescent coating, and then screen print the pearlescent coating on the plastic injection molded part 10, and form a pearlescent layer 20 after curing.

[0056] Embodiment 4: The difference from Embodiment 1 is that a protective layer 30 is formed on the pearlescent layer 20, such as Figure 2 shown.

[0057] The results show that the brightness of the product obtained in Example 1 is obviously not as good as that of the products in Examples 2 and 3, the density of the silver onion powder in Example 3 is greater than that in Example 2, and the flash effect of Example 3 is better than that of Example 2. When other parameters are the same, the product obtained by using 40-mesh pearlescent pigment particles is brighter and more beautiful than the product obtained by using 60-mesh pearlescent pigment particles.

[0058] A pearlescent printing process for producing pearlescent printed products comprises the following steps:

[0059] Preparation of coating: weigh the silver onion powder, varnish and curing agent in the formula, stir evenly to obtain pearlescent coating;

[0060] Plate making: Make a screen with a pattern through the photosensitive plate making method, and install the screen on the printing equipment;

[0061] Screen printing: The plastic injection molded part 10 is used as a substrate for the printing device, and then the pearlescent coating is poured on the front end of the screen of the screen, and a scraper is used to apply downward pressure to the screen to squeeze the pearlescent coating on the screen through the mesh of the screen to the surface of the plastic injection molded part; that is, a layer of pearlescent layer is printed on the surface of the plastic injection molded part using the screen after gluing, and the surface of the plastic injection molded part is pretreated before printing, and the pretreatment method includes at least one of flame spraying, air jet treatment and oil spraying treatment; the above method can effectively improve the adhesion of the surface of the plastic product, thereby ensuring the quality of printing.

[0062] Drying: Take out the printed plastic injection molded part 10, put it in a drying device for drying and curing to form a pearlescent layer 20, and obtain a pearlescent printed product;

[0063] Cutting: trimming the pearlescent printed products to get the finished products. Pearlescent printing refers to a special printing technology that uses pearlescent ink. Because pearlescent ink has the natural luster of pearls, the packaging and printed products show colorful colors like pearls, which are noble and elegant. Pearlescent printing has the flash effect of metallic pigments and can produce the soft color of natural pearls. When exposed to sunlight, it can produce multi-level reflections. The reflected light interacts with each other to present soft and dazzling or colorful luster and color. Therefore, the pearlescent printing process is widely used in the printing of various plastic products. Its characteristics are fast printing speed, good printing effect, low cost, etc. Pearlescent printing generally adopts screen printing technology. The main steps include: designing patterns, plate making, printing, drying, cutting, etc. Among them, plate making is the key step of screen printing process, and the quality of plate making directly affects the quality of printing effect.

[0064] Optionally, the plate making process includes the following steps:

[0065] Stretching the screen: put the screen frame on the stretching machine, select the mesh cloth with the required mesh to stretch the screen; that is, after cleaning the screen frame, put it on the stretching machine, stretch the 60-mesh or 40-mesh mesh cloth on the screen frame to get the screen plate;

[0066] Edge-sealing tape: Use tape to seal the edges of the screen; use Yinlong tape to wrap the four sides of the screen to protect the firmness of the mesh and Nanbao glue and improve the aesthetics of the screen;

[0067] Cleaning the screen: Use a degreasing agent to clean the screen; each screen needs to be brushed with a pneumatic brush and then rinsed with clean water, and then placed in a sink to drain the water;

[0068] Bake the screen: put the cleaned screen into the oven for baking; insert the screen evenly in the middle of the grid in the oven, and control the oven temperature within 38℃;

[0069] Screen gluing: Scrape photosensitive glue on the front and back of the dried screen;

[0070] Drying the screen: Use 3M tape to stick the film on the back of the screen glue, and then place it on the glass of the exposure machine for exposure;

[0071] Development in water: After exposure, remove the film and put the screen into water for development. For the fine parts of the screen, use a water gun to rinse it. After development, put it into the oven to dry. Before drying, the developed screen needs to be inspected, and the qualified screen can be baked.

[0072] Check and repair: Check and repair the dried screen; check the screen again after drying, and repair any ink leakage with photosensitive glue;

[0073] Exposure for firmness: Place the repaired screen back on the platesetting machine and expose both the front and back sides for 160 seconds to increase the firmness of the draft.

[0074] Optionally, the screen gluing process includes the following steps:

[0075] First gluing: pour the photosensitive glue into the scraper, place the screen on a wooden frame at an angle of 35 degrees, and use the scraper to scrape the glue on the back and front of the screen for the first time. Optionally, use the scraper to scrape the glue on the back of the screen 3 times, then scrape the glue on the front 3 times, and finally scrape the glue on the back once to seal the screen; put it in the oven to dry after finishing;

[0076] Second gluing: After the dried screen is scraped for the second time, optionally, use a scraper to scrape the glue 6 times on the back of the screen and 4 times on the front, and then put it in the oven to dry;

[0077] Third gluing: After the dried screen is scraped for the third time, optionally, use a scraper to scrape the glue on the back of the screen 6 times, and then put it into the oven to dry. After the third drying, the screen is completely glued. It should be noted that light should be avoided during gluing, and gluing should be done in a place with weak light. In this application, the three-time gluing process is used to ensure the gluing effect of the screen, thereby ensuring the quality of plate making.

[0078] It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these modifications and improvements are all within the scope of protection of the present application. Therefore, the scope of protection of the patent of the present application shall be subject to the attached claims.

Claims

1. A pearlescent printing product, characterized in that: The invention comprises a plastic injection molded part (10) and a pearlescent layer (20), wherein the pearlescent layer (20) is formed on the surface of the plastic injection molded part (10) by a printing process, and the pearlescent layer (20) comprises pearlescent pigment particles, wherein the pearlescent pigment particles form a pattern on the pearlescent layer (20), wherein the pattern comprises a point A, and two detection areas M and N are randomly selected around the pattern where the pattern can be detected, wherein the brightness of the point A detected from the detection area M is L1, and the brightness of the point A detected from the detection area N is L2, and L1 and L2 are not equal.

2. The pearlescent printing product according to claim 1, characterized in that: The pattern is detected in a detection area P around the pattern where the pattern can be detected, and the pattern includes a bright spot B and a dark spot C, and the brightness of the bright spot B is greater than the brightness of the dark spot C; the pattern is detected in a detection area Q around the pattern where the pattern can be detected, and the brightness of the bright spot B is less than the brightness of the dark spot C, and the detection area Q does not overlap with the detection area P.

3. The pearlescent printing product according to claim 1, characterized in that: The pearlescent layer (20) further comprises a varnish layer, wherein the varnish layer covers the pearlescent pigment particles and fixes the pearlescent pigment particles in the pearlescent layer (20).

4. The pearlescent printing product according to claim 1, characterized in that: It also includes a protective layer (30), wherein the protective layer (30) covers the pearlescent layer (20).

5. The pearlescent printing product according to claim 1, characterized in that: The pearlescent pigment particles include at least one of pearlescent powder and onion powder.

6. The pearlescent printing product according to claim 1, characterized in that: The particle size of the pearlescent pigment particles is 80 μm to 800 μm.

7. The pearlescent printing product according to claim 1, characterized in that: The particle size of the pearlescent pigment particles is 250 μm or 380 μm.

8. The pearlescent printing product according to any one of claims 1 to 7, characterized in that: The pearlescent layer (20) comprises the following raw materials in parts by weight: 5-20 parts of pearlescent pigment particles, 10-60 parts of varnish and 0.1-5 parts of curing agent.

9. The pearlescent printing product according to claim 8, characterized in that: The mass ratio of the pearlescent pigment particles to the varnish is 1:1.5 to 1:4, and the percentage of the curing agent in the total mass of the pearlescent layer raw materials is 3-6%.

10. The pearlescent printing product according to claim 8, characterized in that: The pearlescent layer (20) further comprises the following raw materials in parts by weight: 0.01-1 part of optically variable powder.

11. A pearlescent printing process for producing the pearlescent printed product according to any one of claims 1 to 10, characterized in that: The steps include: Preparation of coating: weigh the pearlescent pigment particles, varnish and curing agent in the formula, stir evenly to obtain the pearlescent coating; Plate making: a screen with a pattern is made by a photosensitive plate making method, and the screen is installed on a printing device; Screen printing: using the plastic injection molded part (10) as a substrate for printing equipment, then pouring the pearlescent coating onto the front end of the screen of the screen, applying downward pressure to the screen using a scraper, and squeezing the pearlescent coating on the screen through the mesh of the screen onto the surface of the plastic injection molded part (10); Drying: taking the printed plastic injection molded part (10), placing it in a drying device for drying and curing to form a pearlescent layer (20), thereby obtaining a pearlescent printed product; Cutting: trimming the pearlescent printing product to obtain a finished product.

12. The pearlescent printing process according to claim 11, characterized in that: The plate making process comprises the following steps: Stretching the screen: put the screen frame on the stretching machine, select the mesh cloth with the required mesh size to stretch the screen, and make the screen plate; Edge sealing tape: Use tape to seal the edges of the screen; Cleaning the screen: using a degreasing agent to clean the screen; Baking the screen: putting the cleaned screen into the oven for baking; Screen gluing: applying photosensitive glue on the front and back of the dried screen; Drying the screen: Use 3M tape to stick the film on the back of the screen glued on, and place it on the glass of the plate exposure machine for exposure; Development in water: After exposure, the film is removed, the screen is placed in water for development, and then placed in an oven for drying; Inspection and repair: inspect and repair the dried screen; Exposure and firmness: Place the repaired screen back on the plate-making machine and expose both the front and back sides to increase the firmness of the draft.

13. The pearlescent printing process according to claim 12, characterized in that: The screen gluing process comprises the following steps: First gluing: pour the photosensitive glue into the scraper, place the screen on a wooden frame at an angle, use the scraper to scrape the glue on the back and front of the screen for the first time, and then put it in the oven for drying; Second gluing: After the dried screen is glued for the second time, it is placed in an oven for drying; The third gluing: After the dried screen is subjected to the third gluing, it is placed in an oven for drying.

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