Electronic cigarette packaging shell printing processing technology

Abstract

The invention relates to a printing processing technology for an electronic cigarette packaging shell. The technology comprises the following steps that S1, a laser layer is formed on a printing stock through transfer of a cold stamping technology; s2, performing color printing on the laser layer of the printing stock by adopting UV ink to form a color printing layer; s3, covering the color printing layer of the printing stock with a film to form a wear-resistant protective layer; s4, carrying out round roller silk-screen printing on transparent gloss oil on the wear-resistant protective layer of the printing stock to form a gloss oil layer; s5, carrying out die cutting on the printing stock with the laser layer, the color printing layer, the wear-resistant protective layer and the gloss oil layer to obtain a sheet with a preset shape; and S6, the sheet is attached to the whole outer surface of the electronic cigarette tube body, and the electronic cigarette packaging shell is manufactured. The electronic cigarette packaging shell is manufactured by adopting a printing process, cold stamping laser, UV color printing and a composite protective layer are combined, and an oiling procedure is omitted, so that the electronic cigarette packaging shell has the advantages of high wear resistance, excellent visual effect and environmental protection.

Description

Technical Field

[0001] This invention relates to the field of electronic cigarette manufacturing technology, specifically to a printing and processing technology for electronic cigarette outer casing packaging. Background Technology

[0002] As a key component that directly affects users' first impression and user experience, the surface decoration process of electronic cigarette casings not only needs to be visually appealing, but also needs to meet requirements such as sun resistance, wear resistance, and corrosion resistance during long-term use.

[0003] In existing technologies, e-cigarette casings are generally made of metal and decorative effects are achieved through surface treatment processes such as spray plating. While spray plating can give the casing a certain metallic luster and texture, the adhesion of the sprayed layer is limited, and it is prone to peeling and scratches under frequent friction or impact. Spray plating also has weak support for complex patterns, fine graphics, and multi-color gradients, making it difficult to meet the current market's pursuit of personalized and artistic packaging. Furthermore, the spray plating process involves the emission of heavy metals and volatile organic compounds, posing a significant environmental burden and contradicting the trend of green manufacturing. In addition, in existing printing technologies, water-based or solvent-based varnishes are usually applied to the entire surface of the substrate after the laser layer is cold-stamped, followed by drying to form a cover layer. This process increases the complexity of the process and raises material and energy costs. Summary of the Invention

[0004] The purpose of this invention is to provide a printing and processing technology for electronic cigarette outer casings, thereby solving the above-mentioned problems.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a printing and processing process for electronic cigarette packaging shells, the process comprising the following steps:

[0006] Step S1: A laser layer is transferred onto the substrate using a cold foil stamping process;

[0007] Step S2: Apply UV ink to the laser layer of the substrate for color printing to form a color printing layer;

[0008] Step S3: Apply a film to the colored printing layer of the substrate to form a wear-resistant protective layer;

[0009] Step S4: Print a transparent varnish on the wear-resistant protective layer of the substrate using a rotary screen printing machine to form a varnish layer;

[0010] Step S5: Die-cut the substrate having a laser layer, a color printing layer, a wear-resistant protective layer and a varnish layer to obtain a sheet of a predetermined shape;

[0011] Step S6: The sheet is attached to the entire outer surface of the electronic cigarette tube to obtain the electronic cigarette packaging shell.

[0012] As a further optimization of the present invention, step S3 includes the following steps:

[0013] Step S31: Unwind the protective film;

[0014] Step S32: The protective film is laminated onto the color printing layer by hot pressing.

[0015] As a further optimization of the present invention, in step S31, the protective film is a scratch-resistant matte film.

[0016] As a further optimization of the present invention, in step S4, the rotary roller screen printing of transparent varnish is performed using a screen printing system including a squeegee and a back-inking blade. The screen printing varnish includes the following steps:

[0017] Step S41: The squeegee descends to contact the screen and moves to extrude the varnish from the starting end through the screen and onto the wear-resistant protective layer of the substrate;

[0018] Step S42: The squeegee rises to detach from the screen and returns to the starting position. The ink return blade collects the varnish remaining on the screen surface to the starting end.

[0019] As a further optimization of the present invention, in step S4, a 300-mesh screen is used, a 163B transparent varnish is used, and the thickness of the varnish layer on the substrate after curing is 0.25 mm or more.

[0020] As a further optimization of the present invention, the substrate is a composite roll formed by laminating a PET substrate onto a base paper with an adhesive layer. In step S5, a rotary die-cutting device including a die-cutting roller and an anvil roller is used to die-cut the substrate. The die-cutting includes the following steps:

[0021] Step S51: The substrate is brought into the pressing area formed between the die-cutting cylinder and the anvil roller;

[0022] Step S52: The die-cutting blade on the die-cutting roller applies a predetermined pressure to cut through the PET substrate, laser layer, color printing layer, wear-resistant protective layer, varnish layer and adhesive layer of the substrate according to a predetermined shape, while maintaining the integrity of the base paper;

[0023] Step S53: Remove the cut edge material so that the sheet of the predetermined shape is independently retained on the continuous base paper.

[0024] As a further optimization of the present invention, steps S3, S4, and S5 are all completed continuously on the same production line.

[0025] As a further optimization of the present invention, step S2, using UV ink for color printing includes the following steps:

[0026] Step S21: Print a white ink layer with a dot area ratio of 30% to 40% on the laser layer;

[0027] Step S22: On the white ink layer, perform color printing in the order of black, cyan, magenta, yellow, and spot color inks.

[0028] As a further optimization of the present invention, step S1, the cold ironing process for transferring and forming the laser layer includes the following steps:

[0029] Step S11: Perform corona treatment on the substrate;

[0030] Step S12: Transfer the laser-etched silver onto the substrate under constant temperature and humidity conditions.

[0031] As a further optimization of the present invention, the product obtained by this process meets one or more of the following performance requirements:

[0032] (a) No coating failure was observed after xenon arc lamp aging test, the test conditions being: irradiance 1090W / m 2 The blackboard temperature is 40℃, and one cycle consists of 20.0 hours of light exposure and 4.0 hours of darkness. A total of 3 cycles are performed. After aging, 100 grids are drawn on the sample surface according to the standard, and then it is irradiated for 1 cycle under the same xenon lamp conditions. After that, it is dried in a standard environment and can be stably stacked to a height of 120cm without interlayer adhesion, warping, coating peeling or detachment of the 100 grid area.

[0033] (b) After being wrapped in cotton fabric soaked in artificial sweat and stored in a constant temperature and humidity chamber at 65°C and 90% RH for 48 hours, the surface was placed in an environment of 20±5°C for 0.5–1.0 hours, and there was no discoloration, bubbling, or peeling of ink or varnish layer.

[0034] (c) A plastic card with right-angled edges is sanded with sandpaper. The operator holds the card with his thumb and forefinger and presses the edge of the card vertically onto the product surface. The operator slowly applies force to bend the card to a 45° angle with the surface and then scratches it 10 times in each of the four directions: from head to tail, from right to left, from tail to head, and from left to right. The distance of each scratch is ≥10mm. After the test, there are no visible scratches, coating peeling, or laser effect damage on the surface.

[0035] (d) Using a HINODEWASHI 502-70 eraser, rub the area 100 times at a frequency of 30 times / minute under a vertical load of 16.1±0.05N. The test area showed no obvious wear, fading or loss of transparent varnish.

[0036] (e) Dip the surface in 95% ethanol and wipe it back and forth for 5 minutes under light load. After the test, the surface should not change color, bubble or dissolve ink.

[0037] (f) No structural or appearance abnormalities after 6 temperature and humidity cycles, wherein the temperature and humidity cycle is: starting from 25°C / 93%RH, the temperature is raised to 65°C within 2.5 hours and held for 5.5 hours, and then cooled back to 25°C within 2.5 hours and held for 5 hours.

[0038] Compared with the prior art, the present invention has the following advantages:

[0039] 1. A laser layer is formed on the substrate using a cold foil stamping process. Combined with UV ink curing and film protection, and screen printing transparent varnish to enhance the visual effect, the bonding between the functional layers and the substrate is strong. Compared with the problem of traditional spray-plated metal layers being easy to peel off due to friction and drops, the composite coating formed by this process has higher scratch resistance, impact resistance and wear resistance, extending the product's service life.

[0040] 2. This invention simplifies the process and reduces the use of raw materials by directly applying UV ink to the laser layer for color printing, eliminating the need for a separate full-page varnishing step.

[0041] 3. The combination of laser layer, color printing layer and varnish layer creates a unique sense of layering and three-dimensionality that surpasses traditional spraying, resulting in strong visual appeal and meeting consumers' demand for personalized and artistic packaging experiences.

[0042] 4. The entire process does not require the use of heavy metals or highly polluting electroplating solutions, demonstrating outstanding environmental performance and conforming to the trend of green manufacturing. Attached Figure Description

[0043] Figure 1 This is a process flow diagram of the present invention. Detailed Implementation

[0044] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0045] like Figure 1 As shown, this invention discloses a printing process for electronic cigarette packaging shells, characterized in that the process includes the following steps:

[0046] Step S1: A laser layer is transferred onto the substrate using a cold foil stamping process;

[0047] Step S2: Apply UV ink to the laser layer of the substrate for color printing to form a color printing layer;

[0048] Step S3: Apply a film to the colored printing layer of the substrate to form a wear-resistant protective layer;

[0049] Step S4: Print a transparent varnish on the wear-resistant protective layer of the substrate using a rotary screen printing machine to form a varnish layer;

[0050] Step S5: Die-cut the substrate having a laser layer, a color printing layer, a wear-resistant protective layer and a varnish layer to obtain a sheet of a predetermined shape;

[0051] Step S6: The sheet is attached to the entire outer surface of the electronic cigarette tube to obtain the electronic cigarette packaging shell.

[0052] In one embodiment, the substrate can be a flexible film material such as PET, BOPP, paper, or composite paper-plastic material. A partial or full-page laser decorative layer with dynamic optical effects is formed on the surface of the substrate using a cold foil stamping process. UV ink is then used for color printing on the laser layer to form a color printing layer, achieving high-fidelity color images such as artistic patterns and multi-color gradients. A pre-coated transparent film is then pressed onto the surface of the color printing layer using a solvent-free laminating machine or a hot roller laminating machine. The film prevents scratches, moisture penetration, and ink abrasion, and facilitates subsequent die-cutting and lamination. A custom-designed screen-printed varnish is then used to create raised areas for enhanced tactile and visual appeal. Finally, a custom-designed steel die or engraving die is used based on the unfolded diagram of the e-cigarette tube, and die-cutting is performed to obtain a single sheet that matches the dimensions of the e-cigarette tube's outer surface. This sheet is then tightly wrapped around the tube, completing the e-cigarette packaging shell with a laser-etched background and color patterns.

[0053] This invention employs a cold foil stamping process to form a laser layer on the substrate. Combined with UV ink curing and film protection, and screen-printed transparent varnish to enhance the visual effect, the bonding strength between the functional layers and with the substrate is strong. Compared to traditional spray-plated metal layers, which are prone to peeling due to friction and drops, the composite coating formed by this process has higher scratch resistance, impact resistance, and wear resistance, extending product lifespan. Furthermore, by directly applying UV ink for color printing on the laser layer, this invention eliminates the need for a separate full-page varnishing step, simplifying the process and reducing raw material usage. The combined laser layer, color printing layer, and varnish layer create a unique sense of layering and three-dimensionality that surpasses traditional spray plating, resulting in strong visual appeal and meeting consumers' demands for personalized and artistic packaging experiences. The entire process does not use heavy metals or highly polluting electroplating solutions, demonstrating outstanding environmental performance and aligning with green manufacturing trends.

[0054] Step S3 includes the following steps:

[0055] Step S31: Unwind the protective film;

[0056] Step S32: The protective film is laminated onto the color printing layer by hot pressing.

[0057] Protective film refers to a transparent, flexible film material used to cover and protect an underlying color-printed pattern. In one embodiment, the protective film is pre-coated with hot melt adhesive on one side at the factory. The rolled protective film is mounted on an automatic unwinding shaft, and a constant unwinding tension is maintained by a tension control system, allowing the film to be conveyed to the laminating station for unwinding. The substrate with a laser layer and a UV color printing layer is fed into the laminating station, where a heated roller hot-presses the protective film, causing the adhesive layer to melt and bond with the printed layer, thereby achieving hot-press lamination.

[0058] In step S31, the protective film is a scratch-resistant matte film.

[0059] In one embodiment, the protective film undergoes surface micro-roughening treatment or is coated with a matte coating to cause diffuse reflection of light, presenting a soft, non-reflective visual texture. At the same time, the surface hardening coating or the base material is modified to improve surface hardness and scratch resistance.

[0060] In step S4, the rotary roller screen printing of transparent varnish is performed using a screen printing system that includes a squeegee and a back-inking blade. The screen printing of the varnish includes the following steps:

[0061] Step S41: The squeegee descends to contact the screen and moves to extrude the varnish from the starting end through the screen and onto the wear-resistant protective layer of the substrate;

[0062] Step S42: The squeegee rises to detach from the screen and returns to the starting position. The ink return blade collects the varnish remaining on the screen surface to the starting end.

[0063] In step S4, the screen printing of the transparent varnish is performed using a standard screen printing system that includes a squeegee and a back-inking blade. In one embodiment, the squeegee descends and contacts the screen, then moves to squeeze the varnish located at the starting end through the fully transparent screen and onto the coated substrate. The squeegee then rises, detaches from the screen, and returns to the starting position, while the back-inking blade collects the varnish remaining on the screen surface back to the starting end, preparing for the next printing cycle. This allows the transparent varnish to cover the surface of the abrasion-resistant protective layer according to the screen's perforations, creating a locally raised area for enhanced tactile and visual appeal while improving abrasion resistance and fingerprint resistance.

[0064] In step S3, a 300-mesh screen is used, and a transparent varnish of type 163B is used. The thickness of the varnish layer on the substrate after curing is more than 0.25 mm.

[0065] The screen printing uses a high-precision 300-mesh screen to avoid sagging or orange peel effects, while ensuring good adhesion to the wear-resistant protective layer. The transparent varnish used is model 163B, a commercially available UV-curing screen printing varnish that has good wetting and adhesion to PET-like laminated surfaces. The cured varnish layer on the substrate has a thickness of at least 0.25mm to ensure sufficient thickness to create areas of raised texture and enhanced visual appeal.

[0066] The substrate is a composite roll formed by bonding a PET substrate to a base paper with an adhesive layer. In step S5, a rotary die-cutting device including a die-cutting roller and an anvil roller is used to die-cut the substrate. The die-cutting accuracy error is less than or equal to 0.1 mm. The die-cutting includes the following steps:

[0067] Step S51: The substrate is brought into the pressing area formed between the die-cutting cylinder and the anvil roller;

[0068] Step S52: The die-cutting blade on the die-cutting roller applies a predetermined pressure to cut through the PET substrate, laser layer, color printing layer, wear-resistant protective layer, varnish layer and adhesive layer of the substrate according to a predetermined shape, while maintaining the integrity of the base paper;

[0069] Step S53: Remove the cut edge material so that the sheet of the predetermined shape is independently retained on the continuous base paper.

[0070] In one embodiment, the substrate used is a composite roll material, the structure of which, from top to bottom, consists of a PET substrate, an adhesive layer, and a backing paper. This composite roll material is pre-made using a dry lamination or solvent-free lamination process, and is in a continuous roll shape, suitable for subsequent cold foil stamping, printing, and rotary die-cutting. In step S5, a rotary die-cutting device is used for die-cutting. This device includes a die-cutting roller and an anvil roller that cooperate with each other. The composite roll material, which has already formed a laser layer, a color printing layer, and a wear-resistant protective layer, is guided into the die-cutting station, allowing it to smoothly enter the pressing area between the die-cutting roller and the anvil roller. The die-cutting roller surface is equipped with a die-cutting blade customized according to the unfolded diagram of an electronic cigarette casing. When the composite roll material passes through the pressing area, the blade applies a predetermined pressure under the rotation of the roller, capable of cutting through the adhesive layer, PET substrate, laser layer, color printing layer, wear-resistant protective layer, and varnish layer without cutting the bottom backing paper. After die-cutting, the cut edge material is peeled off from the backing paper and recycled by waste removal devices such as air suction, film peeling roller or vacuum system, while the sheet of the predetermined shape is still intact on the continuous backing paper, forming a die-cut finished product with a carrier, which is convenient to be attached to the electronic cigarette tube body in the future.

[0071] Steps S3, S4, and S5 are all completed continuously on the same production line. The lamination in step S3, the screen printing of transparent varnish in step S4, and the die-cutting in step S5 are performed in a continuous line. The substrate passes sequentially through the hot-press lamination unit, the screen printing unit, and the rotary die-cutting unit on the same production line. The entire line achieves efficient, high-precision, and automated production without offline transfers through unified tension control and servo synchronization.

[0072] In step S2, color printing using UV ink includes the following steps:

[0073] Step S21: Print a white ink layer with a dot area ratio of 30% to 40% on the laser layer;

[0074] Step S22: On the white ink layer, perform color printing in the order of black, cyan, magenta, yellow, and spot color inks.

[0075] A layer of UV white ink with a 30%–40% coverage area is printed evenly on the cold-stamped laser layer. This layer uses frequency-modulated halftone dots to moderately cover the laser underlayer, preventing color inks from being distorted due to the high reflectivity of the laser surface or interference from metallic colors, while retaining some of the laser luster to show through, creating a unique visual layer that blends color and dynamic optical effects. In this embodiment, the halftone dot area ratio of the white ink layer is preferably 35%. Subsequently, black, cyan, magenta, yellow, and spot colors are printed sequentially on the white ink layer to ensure accurate color overprinting and reduce color mixing deviations.

[0076] Traditional processes require an additional layer of water-based varnish for protection or as a base coat after cold foil stamping, which increases material consumption and drying energy consumption, prolongs the production process, and reduces efficiency. This invention achieves superior color development, adhesion, and surface protection by directly printing a UV white ink layer with a specific dot ratio onto the laser layer, combined with a subsequent composite structure of UV color inks, lamination, and screen-printed transparent varnish. This eliminates the need for a separate full-page varnishing step, simplifying the process, reducing raw material usage, and improving production efficiency.

[0077] In step S1, the cold foil stamping process for forming the laser layer includes the following steps:

[0078] Step S11: Perform corona treatment on the substrate;

[0079] Step S12: Transfer the laser-etched silver onto the substrate under constant temperature and humidity conditions.

[0080] Before entering the cold foil stamping station, the substrate undergoes high-frequency, high-voltage discharge via a corona treatment device, generating plasma on the material surface. This enhances the wettability and adhesion of the subsequent cold foil stamping adhesive, preventing the laser layer from being poorly transferred or detached. Laser foil with a plain silver finish refers to a commercially available cold foil. The transfer process is conducted in a temperature and humidity-controlled workshop to avoid fluctuations in adhesive drying rate or film deformation affecting registration accuracy. In one embodiment, a layer of UV cold foil stamping adhesive is printed on the substrate, then bonded to the laser foil with a plain silver finish. The adhesive is then cured by UV irradiation, simultaneously selectively adhering the aluminized laser layer on the cold foil to the substrate. Finally, the carrier film is peeled off, leaving the substrate with the transferred laser silver layer.

[0081] In one embodiment, the product manufactured using the aforementioned electronic cigarette outer shell packaging printing process has undergone multiple reliability tests, verifying that its appearance and structural stability meet the requirements of harsh usage environments, as detailed below:

[0082] The dimensional deviation of the die-cut sheet is controlled within ±0.1mm to ensure that it fits the outer surface of the electronic cigarette tube without wrinkles or gaps.

[0083] The obtained product was subjected to xenon arc lamp aging test under the following conditions: irradiance 1090W / m 2 The blackboard temperature was 40℃, and one cycle consisted of 20.0 hours of light exposure followed by 4.0 hours of darkness, for a total of 3 cycles. After aging, 100 grid lines were drawn on the sample surface according to the standard, and then the sample was placed under the same xenon lamp conditions for another cycle. The sample was then dried in a standard environment, and a stacking test was performed: it could be stably stacked to a height of 120cm without interlayer adhesion, warping, coating peeling, or detachment of the 100 grid areas.

[0084] The resulting product was wrapped in cotton fabric soaked in artificial sweat and stored in a constant temperature and humidity chamber at 65°C and 90% RH for 48 hours. After being removed, it was placed at 20±5°C for 0.5–1.0 hours, and the surface was observed to show no abnormalities such as discoloration, bubbling, or peeling of ink or varnish.

[0085] A plastic card with right-angled edges, sanded with sandpaper, is used. The operator holds the card between their thumb and forefinger and presses the edge of the card vertically onto the surface of the product. Slowly apply force to bend the card to a 45° angle with the surface and scrape it 10 times in each of the four directions: from beginning to end, from right to left, from end to beginning, and from left to right. Each scraping distance is at least 10mm. After testing, the surface should show no visible scratches, coating peeling, or damage to the laser effect.

[0086] The prepared product was fixed on the test platform, and a vertical load of 16.1±0.05N was applied to it using a HINODEWASHI 502-70 eraser. The product was rubbed back and forth 100 times at a frequency of 30 times / minute. The test area showed no obvious wear, fading or loss of transparent varnish.

[0087] The prepared product was fixed on the instrument platform, dipped in 95% ethanol, and the surface was wiped back and forth for 5 minutes under a light load. After testing, the surface showed no abnormalities such as discoloration, bubbling, or ink dissolution.

[0088] The product underwent the following temperature and humidity cycle: initial conditions 25℃ / 93%RH, temperature increased to 65℃ within 2.5 hours, held for 5.5 hours; then cooled back to 25℃ within 2.5 hours, held for 5 hours, forming a complete cycle; after 6 consecutive cycles, the sample showed no delamination, blistering, color shift or decreased adhesion.

[0089] The test results above show that the electronic cigarette outer casing produced by the process of this invention meets the quality requirements of consumer electronic product appearance parts in terms of dimensional accuracy, weather resistance, chemical resistance and mechanical wear resistance, fully demonstrating the excellent comprehensive performance of the composite printing structure.

Claims

1. A printing and processing technology for electronic cigarette packaging shells, characterized in that, The process includes the following steps: Step S1: A laser layer is transferred onto the substrate using a cold foil stamping process; Step S2: Apply UV ink to the laser layer of the substrate for color printing to form a color printing layer; Step S3: Apply a film to the colored printing layer of the substrate to form a wear-resistant protective layer; Step S4: Print a transparent varnish on the wear-resistant protective layer of the substrate using a rotary screen printing machine to form a varnish layer; Step S5: Die-cut the substrate having a laser layer, a color printing layer, a wear-resistant protective layer and a varnish layer to obtain a sheet of a predetermined shape; Step S6: The sheet is attached to the entire outer surface of the electronic cigarette tube to obtain the electronic cigarette packaging shell.

2. The electronic cigarette outer casing printing and processing technology according to claim 1, characterized in that, Step S3 includes the following steps: Step S31: Unwind the protective film; Step S32: The protective film is laminated onto the color printing layer by hot pressing.

3. The electronic cigarette outer casing printing process according to claim 2, characterized in that, In step S31, the protective film is a scratch-resistant matte film.

4. The electronic cigarette outer casing printing process according to claim 1, characterized in that, In step S4, the rotary roller screen printing of transparent varnish is performed using a screen printing system that includes a squeegee and a back-inking blade. The screen printing of the varnish includes the following steps: Step S41: The squeegee descends to contact the screen and moves to extrude the varnish from the starting end through the screen and onto the wear-resistant protective layer of the substrate; Step S42: The squeegee rises to detach from the screen and returns to the starting position. The ink return blade collects the varnish remaining on the screen surface to the starting end.

5. The electronic cigarette outer casing printing process according to claim 4, characterized in that, In step S4, a 300-mesh screen is used, and a transparent varnish of type 163B is used. The thickness of the varnish layer on the substrate after curing is more than 0.25 mm.

6. The electronic cigarette outer casing printing process according to claim 1, characterized in that, The substrate is a composite roll formed by bonding a PET substrate to a base paper with an adhesive layer. In step S5, a rotary die-cutting device including a die-cutting roller and an anvil roller is used to die-cut the substrate. The die-cutting includes the following steps: Step S51: The substrate is brought into the pressing area formed between the die-cutting cylinder and the anvil roller; Step S52: The die-cutting blade on the die-cutting roller applies a predetermined pressure to cut through the PET substrate, laser layer, color printing layer, wear-resistant protective layer, varnish layer and adhesive layer of the substrate according to a predetermined shape, while maintaining the integrity of the base paper; Step S53: Remove the cut edge material so that the sheet of the predetermined shape is independently retained on the continuous base paper.

7. The electronic cigarette outer casing printing and processing technology according to claim 1, characterized in that, Steps S3, S4, and S5 are all completed continuously on the same production line.

8. The electronic cigarette outer casing printing and processing technology according to claim 1, characterized in that, In step S2, color printing using UV ink includes the following steps: Step S21: Print a white ink layer with a dot area ratio of 30% to 40% on the laser layer; Step S22: On the white ink layer, perform color printing in the order of black, cyan, magenta, yellow, and spot color inks.

9. The electronic cigarette outer casing printing process according to claim 1, characterized in that, In step S1, the cold foil stamping process for forming the laser layer includes the following steps: Step S11: Perform corona treatment on the substrate; Step S12: Transfer the laser-etched silver onto the substrate under constant temperature and humidity conditions.

10. The electronic cigarette outer casing printing process according to claim 1, characterized in that, The product obtained by this process meets one or more of the following performance requirements: (a) No coating failure was observed after xenon arc lamp aging test, the test conditions being: irradiance 1090W / m 2 The blackboard temperature is 40℃, and one cycle consists of 20.0 hours of light exposure and 4.0 hours of darkness. A total of 3 cycles are performed. After aging, 100 grids are drawn on the sample surface according to the standard, and then it is irradiated for 1 cycle under the same xenon lamp conditions. After that, it is dried in a standard environment and can be stably stacked to a height of 120cm without interlayer adhesion, warping, coating peeling or detachment of the 100 grid area. (b) After being wrapped in cotton fabric soaked in artificial sweat and stored in a constant temperature and humidity chamber at 65°C and 90% RH for 48 hours, the surface was placed in an environment of 20±5°C for 0.5–1.0 hours, and there was no discoloration, bubbling, or peeling of ink or varnish layer. (c) A plastic card with right-angled edges is sanded with sandpaper. The operator holds the card with his thumb and forefinger and presses the edge of the card vertically onto the product surface. The operator slowly applies force to bend the card to a 45° angle with the surface and then scratches it 10 times in each of the four directions: from head to tail, from right to left, from tail to head, and from left to right. The distance of each scratch is ≥10mm. After the test, there are no visible scratches, coating peeling, or laser effect damage on the surface. (d) Using a HINODEWASHI 502-70 eraser, rub the area 100 times at a frequency of 30 times / minute under a vertical load of 16.1±0.05N. The test area showed no obvious wear, fading or loss of transparent varnish. (e) Dip the surface in 95% ethanol and wipe it back and forth for 5 minutes under light load. After the test, the surface should not change color, bubble or dissolve ink. (f) No structural or appearance abnormalities after 6 temperature and humidity cycles, wherein the temperature and humidity cycle is: starting from 25°C / 93%RH, the temperature is raised to 65°C within 2.5 hours and held for 5.5 hours, and then cooled back to 25°C within 2.5 hours and held for 5 hours.

Images