Printing process for piercing-resistant flame-retardant label

Abstract

A printing process for a piercing-resistant flame-retardant label, relating to the technical field of printing. The flame-retardant label comprises a piercing-resistant base layer (10), a flame-retardant layer (20), a printed pattern layer (30), and a piercing-resistant surface layer (40) which are arranged in sequence. The base layer (10) and the surface layer (40) are DuPont films laminated together via a composite process, and the durability and use effect of the label are improved by means of the piercing resistance of the Dupont films. In the printing process, the treatment of the base layer (10) comprises stretching to ensure a flat surface, followed by precisely applying thereon a bonding layer (102) and an adhesive film layer, as well as attaching the flame-retardant layer (20), thereby effectively improving the flatness and structural strength of the base layer (10) and imparting excellent flame-retardant properties to a product. Additionally, the flame-retardant properties and the structural strength can both be improved, providing a powerful guarantee for product safety.

Description

Printing process for puncture-resistant and flame-retardant labels Technical Field

[0001] This invention relates to the field of printing technology, and in particular to a printing process for puncture-resistant and flame-retardant labels. Background Technology

[0002] Label printing, as a highly specialized printing technology, refers to the process of accurately and clearly printing text, patterns, barcodes, QR codes, and other information onto various materials (such as paper, plastic film, and metal foil) using specific printing techniques. This process not only requires the printed content to be accurate but also ensures that the labels are wear-resistant, water-resistant, and chemically resistant to meet the diverse needs of different industries for product identification, tracking, management, and promotion. Technical issues

[0003] In the label printing industry, common printing methods include flexographic printing, letterpress printing, gravure printing, digital printing (such as inkjet printing and laser printing), and electron beam printing, which has emerged in recent years. With technological advancements, the label printing industry is constantly integrating new technologies, such as intelligent identification and anti-counterfeiting technologies. This allows labels to not only carry basic information but also possess functions like anti-counterfeiting traceability and intelligent interaction, greatly enhancing product added value and market competitiveness. Currently, some printed labels possess flame-retardant and fire-resistant properties. However, existing flame-retardant and fire-resistant labels are relatively complex to manufacture, lack puncture resistance, and have low production efficiency. Therefore, new improvements are needed to address existing label production methods. Technical solutions

[0004] To address the aforementioned issues, this invention provides a flame-retardant layer that effectively improves the flatness and structural strength of the substrate, while also endowing the product with superior flame-retardant properties in its printed label and printing process.

[0005] The technical solution adopted in this invention is: a printing process for a puncture-resistant flame-retardant label, wherein the flame-retardant label comprises a substrate layer, a flame-retardant layer, a printed pattern layer, and a surface layer arranged sequentially; a release film is provided on the side of the substrate layer opposite to the flame-retardant layer, an adhesive layer is provided on one side of the substrate layer, and the flame-retardant layer is placed inside the adhesive layer; a flame-retardant connecting layer is provided on the surface layer, and the surface layer is connected to the coating layer and the printed pattern layer through the flame-retardant connecting layer;

[0006] The printing process includes the following steps:

[0007] Step S1, substrate layer preparation: stretch the substrate layer with release film so that the side of the substrate layer opposite to the release film remains flat, apply an adhesive layer to the flat side, apply the adhesive film layer to both sides of the flat side, and then attach the flame retardant layer to one side of the substrate layer. The adhesive layer is used to block the flame retardant layer inside the substrate layer.

[0008] Step S2, Pattern Preparation: A pattern is printed onto the pattern layer;

[0009] Step S3, One-time composite bonding: The adhesive layer and the printed pattern layer are bonded together by roller pressing;

[0010] Step S4, Micro-gravure printing: After the substrate layer and the printed pattern layer are rolled together, the printed pattern is rolled on by a micro-gravure printing roller to make the printed pattern micro-gravure.

[0011] Step S5, Preparation of flame retardant bonding layer: A flame retardant is attached to the BOPE to form a film-like flame retardant bonding layer, and the film-like flame retardant bonding layer is placed between the surface layer and the printed pattern layer.

[0012] Step S6, Secondary Composite Connection: The surface layer and the printed pattern layer are connected by a film-like flame-retardant connection layer through hot rolling. During the hot melt connection process, the BOPE is hot melted, and the flame retardant follows the hot melted liquid BOPE to penetrate and connect the surface layer, the printed pattern layer, and the micro-recesses of the pattern.

[0013] Step S7, label die-cutting: The material that has completed the secondary composite connection is cooled and shaped, and then sent to the die-cutting mechanism to form a label.

[0014] A further improvement to the above solution is that the substrate layer is made of paper-based material, PVC or PET, and the flame-retardant layer is formed on the substrate layer by coating; the printed pattern layer is coated paper; and the surface layer is a transparent film layer.

[0015] A further improvement to the above scheme is that the printing process is completed by printing equipment, which includes a worktable, a substrate preparation mechanism, a printing pattern preparation mechanism, a first composite bonding mechanism, a micro-gravure printing mechanism, a second composite bonding mechanism, a die-cutting mechanism, and a receiving mechanism, all mounted on the worktable. The substrate preparation mechanism is used for substrate layer preparation in step S1; the printing pattern preparation mechanism is used for printing pattern preparation in step S2; the first composite bonding mechanism is used for primary composite bonding in step S3; the micro-gravure printing mechanism is used for micro-gravure printing in step S4; the second composite bonding mechanism is used for flame-retardant bonding layer preparation and secondary composite bonding in steps S5-S6; and the die-cutting mechanism is used for label die-cutting in step S7.

[0016] A further improvement to the above scheme is that the substrate preparation mechanism includes a substrate unwinding assembly, a substrate stretching assembly, a substrate adhesive assembly, and a flame-retardant coating assembly arranged sequentially on the worktable; in step S1, the substrate unwinding assembly unwinds the substrate layer and stretches the substrate by the substrate stretching assembly to keep the substrate layer flat, and then the substrate adhesive assembly applies the adhesive coating to both sides of the substrate layer by roller pressing. After the coating is completed, the flame-retardant coating assembly forms a flame-retardant layer on the substrate layer.

[0017] A further improvement to the above solution is that the substrate adhesive assembly is used to roll-coat an adhesive layer on the substrate layer to form a recess on the substrate layer, and the flame retardant layer is applied to the recess by a flame retardant coating assembly.

[0018] A further improvement to the above scheme is that the printing pattern preparation mechanism includes a printing feeding component, a printing component, and a drying component arranged sequentially on the worktable. The printing component includes a printing disk and a printing module arranged on the outer periphery of the printing disk. At least one set of printing modules is provided. In step S2, the printing feeding component is used to feed the printing pattern layer onto the printing disk, the printing disk stretches and transmits the printing pattern layer, the printing module is used to print the pattern on the printing pattern layer, and the drying component is used to dry and set the printed pattern layer.

[0019] A further improvement to the above scheme is that the first composite connection mechanism includes a first roller composite assembly and a first pressing roller group. In step S3, the substrate preparation mechanism conveys the substrate layer prepared in step S1 and the printed pattern layer prepared in step S2 toward the first thermal composite assembly. The first thermal composite assembly rolls the substrate layer and the printed pattern layer together through two sets of roller groups with tangent outer diameters. During the rolling process, the roller groups are heated so that the printed pattern layer and the substrate layer are bonded together through an adhesive layer.

[0020] A further improvement to the above scheme is that the micro-gravure printing mechanism includes a micro-gravure printing roller group. In step S4, after completing step S3, the composite-connected substrate layer and the printed pattern layer are fed into the micro-gravure printing roller group. The circular roller of the micro-gravure printing roller group is provided with a printing protrusion. The printing protrusion presses the pattern on the printed pattern layer toward the roller so that the pattern is facing the micro-gravure, and the printed pattern layer and the flame retardant layer are calendered.

[0021] A further improvement to the above scheme is that the second composite connection mechanism includes a film unwinding assembly, a flame-retardant spraying assembly, a hot melt leveling assembly, a surface unwinding assembly, a second thermal composite assembly, and a second pressure roller group.

[0022] A further improvement to the above solution is that the hot melt leveling assembly includes a hot melt leveling module and a hot melt spray gun. The hot melt leveling module includes a fixed plate, an elastic connecting plate, and a hot melt scraper. The fixed plate is connected to the hot melt scraper through the elastic connecting plate. The hot melt scraper is provided with a heating tube to heat the hot melt scraper. The elastic connecting plate is an elastic stainless steel plate and is provided with an inclined surface. The inclined surface is inclined towards the second hot composite assembly. The hot melt spray gun includes a hot melt connecting frame and a hot melt nozzle. One end of the hot melt connecting frame is connected to the fixed plate. The spraying end of the hot melt nozzle faces one side of the hot melt scraper. The end of the hot melt scraper is provided with an arc-shaped edge. A support roller is provided below the hot melt scraper. The outer diameter of the support roller is tangent to the outer diameter of the arc-shaped edge.

[0023] A further improvement to the above scheme is that, in steps S5-S6, the film unwinding assembly is used to transport the BOPE film toward the flame retardant spraying assembly, which is used to spray flame retardant onto the BOPE film; then it is transported toward the second thermal lamination assembly. The BOPE film coated with flame retardant is thermally melted by the action of the hot melt scraper and hot melt nozzle. After thermal melting, the flame retardant and liquid BOPE film are scraped flat onto the printed pattern layer by the hot melt scraper and integrated into the pattern micro-recessed penetration. Then it is transported toward the second thermal lamination assembly. At this time, the surface layer unwinding assembly unwinds the surface layer to the second thermal lamination assembly. At this time, the second thermal lamination assembly connects the surface layer with the thermally melted BOPE film. Finally, it is calendered by the second pressure roller group.

[0024] A further improvement to the above scheme is that a cooling and shaping component is provided at the front end of the die-cutting mechanism. The cooling and shaping component is used to cool and shape the composite material in step S6, and then the die-cutting mechanism is used to form the shape of the label. Finally, the material is collected by the receiving mechanism. Beneficial effects

[0025] Compared to existing labels, the combination of the substrate layer and flame-retardant layer in this invention effectively enhances the product's safety performance, making it suitable for scenarios requiring high fire resistance. The release film facilitates flexible label handling during production and subsequent applications, improving production efficiency and product quality. The adhesive layer design around the flame-retardant layer ensures a firm bond between the label and the surface, maintaining good adhesion even in harsh environments and extending service life. Simultaneously, the flame-retardant layer layout within the adhesive layer further strengthens the overall flame-retardant effect, forming comprehensive safety protection. The flame-retardant bonding layer introduced into the surface layer not only enhances the connection strength with the lamination layer and printed pattern layer but also maintains the overall flame-retardant properties, giving the label both visual appeal and excellent practical functionality. Both the surface layer and the substrate layer are made of DuPont film, effectively improving the label's puncture resistance, thereby strengthening the structure's robustness and durability.

[0026] The substrate layer treatment in the printing process includes stretching to ensure surface flatness, followed by precise coating of adhesive and film layers, and attachment of a flame-retardant layer. This effectively improves the flatness and structural strength of the substrate while giving the product excellent flame-retardant properties. Secondly, the introduction of a printed pattern layer combined with fine printing technology ensures the clarity and color reproduction of the pattern, meeting diverse and high-standard visual presentation needs. The subsequent micro-gravure printing step uses roller pressing technology to create a micro-recessed effect on the pattern surface, enhancing not only the tactile texture but also improving the product's anti-counterfeiting performance and artistic value. Furthermore, the innovative application of the flame-retardant bonding layer, particularly the film structure formed by attaching flame retardant to BOPE, solves the technical challenge of bonding flame retardancy with materials. During the secondary composite bonding process, hot roller pressing technology melts the BOPE, allowing the flame retardant to penetrate and firmly bond each layer, achieving a dual improvement in flame-retardant performance and structural strength, providing strong protection for product safety. Precise cutting of the finished product through die-cutting not only improves production efficiency but also ensures the standardization and consistency of labels, facilitating subsequent application and management. Overall, this printing process solution achieves the technical goals of efficient, precise, and safe production. Attached Figure Description

[0027] Figure 1 is a schematic diagram of the structure of the flame-retardant label of the present invention;

[0028] Figure 2 is a structural schematic diagram of the flame retardant label in Figure 1 from another perspective;

[0029] Figure 3 is a schematic diagram of the preparation process of the flame retardant label in Figure 1;

[0030] Figure 4 is a schematic diagram of the printing process of the puncture-resistant flame-retardant label of the present invention;

[0031] Figure 5 is a perspective view of the printing equipment of the present invention;

[0032] Figure 6 is a three-dimensional schematic diagram of the printing equipment in Figure 5 from another perspective;

[0033] Figure 7 is a front view schematic diagram of the printing equipment in Figure 5;

[0034] Figure 8 is an enlarged view of point A in Figure 7;

[0035] Figure 9 is an enlarged view of point B in Figure 7;

[0036] Figure 10 is an enlarged view of point C in Figure 7;

[0037] Figure 11 is an enlarged schematic diagram of point D in Figure 7.

[0038] Explanation of reference numerals in the attached drawings: Substrate layer 10, Release film 101, Adhesive layer 102, Flame retardant layer 20, Printed pattern layer 30, Surface layer 40, Flame retardant bonding layer 401;

[0039] 1. Workbench; 2. Substrate preparation mechanism; 3. Substrate unwinding assembly; 4. Substrate stretching assembly; 5. Substrate adhesive assembly; 6. Flame retardant coating assembly; 7. Printing pattern preparation mechanism; 8. Printing feeding assembly; 9. Printing assembly; 10. Printing disc; 11. Printing module; 12. Drying assembly; 13. First composite connection mechanism; 14. First thermal composite assembly; 15. First pressure roller assembly; 16. Microgravure printing mechanism; 17. Microgravure printing roller assembly; 18. Printing flange; 19. Second composite connection machine. Component 6, film unwinding assembly 61, flame retardant spraying assembly 62, hot melt connecting frame 6321, hot melt nozzle 6322, hot melt leveling assembly 63, hot melt leveling module 631, fixing plate 6311, elastic connecting plate 6312, hot melt scraper 6313, arc edge 6314, support roller 6315, hot melt spray gun 632, surface unwinding assembly 64, second thermal bonding assembly 65, second pressing roller group 66, die-cutting mechanism 7, cooling and shaping assembly 71, and take-up mechanism 8. Embodiments of the present invention

[0040] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0041] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0043] As shown in Figures 1-11, one embodiment of the present invention relates to a printing process for a puncture-resistant flame-retardant label. The flame-retardant label includes a substrate layer 10, a flame-retardant layer 20, a printed pattern layer 30, and a surface layer 40 arranged sequentially. A release film 101 is provided on the side of the substrate layer 10 opposite to the flame-retardant layer 20, and an adhesive layer 102 is provided on one side of the substrate layer 10, with the flame-retardant layer 20 placed within the adhesive layer 102. A flame-retardant connecting layer 401 is provided on the surface layer 40, connecting the surface layer 40 to the lamination layer and the printed pattern layer 30. In this embodiment, the combination of the substrate layer 10 and the flame-retardant layer 20 effectively improves the safety performance of the product, making it suitable for scenarios requiring high fire resistance. The release film 101 facilitates flexible operation of the label during production and subsequent applications, improving production efficiency and finished product quality. The adhesive layer 102 design around the flame-retardant layer 20 ensures a firm bond between the label and the adhesion surface, maintaining good adhesion even in harsh environments and extending service life. Simultaneously, the layout of the flame-retardant layer 20 within the adhesive layer 102 further enhances the overall flame-retardant effect, forming comprehensive safety protection. The flame-retardant bonding layer 401 introduced into the surface layer 40 not only strengthens the connection with the laminating layer and printed pattern layer 30 but also maintains the overall flame-retardant properties, making the label both visually appealing and highly functional.

[0044] The printing process includes the following steps: Step S1, preparation of substrate layer 10: The substrate layer 10 with release film 101 is stretched so that the side of the substrate layer 10 opposite to the release film 101 remains flat. An adhesive layer 102 is coated on the flat side, and the adhesive layer is coated on both sides of the flat side. Then, a flame retardant layer 20 is attached to one side of the substrate layer 10. The adhesive layer 102 is used to contain the flame retardant layer 20 within the substrate layer 10. Step S2, preparation of printed pattern: A pattern is printed on the printed pattern layer 30. Step S3, primary composite bonding: The adhesive layer 102 and the printed pattern layer 30 are bonded together by roll forming. Step S4, micro-gravure printing: After the substrate layer 10 and the printed pattern layer 30 are bonded by roll forming, the pattern is printed on the printed pattern using a micro-gravure printing roller. Step S5, Flame-retardant bonding layer 401 preparation: A flame retardant is attached to the BOPE to form a film-like flame-retardant bonding layer 401, and the film-like flame-retardant bonding layer 401 is placed between the surface layer 40 and the printed pattern layer 30; Step S6, Secondary composite bonding: The surface layer 40 and the printed pattern layer 30 are connected by the film-like flame-retardant bonding layer 401 through hot rolling. During the hot melt bonding process, the BOPE is melted, and the flame retardant follows the melted liquid BOPE to penetrate and connect the surface layer 40, the printed pattern layer 30, and the micro-recessed pattern; Step S7, Label die-cutting: The material that has completed the secondary composite bonding is cooled and shaped, and then sent to the die-cutting mechanism to form a label.

[0045] In this embodiment, the processing of the substrate layer 10 in the printing process includes stretching to ensure surface flatness, precisely coating it with an adhesive layer 102 and an adhesive film layer, and attaching a flame-retardant layer 20. This effectively improves the flatness and structural strength of the substrate, while giving the product excellent flame-retardant properties, laying a solid foundation for subsequent processing. Secondly, the introduction of the printed pattern layer 30 and its combination with fine printing technology ensures the clarity and color reproduction of the pattern, meeting diverse and high-standard visual presentation requirements. The subsequent micro-gravure printing step uses roller pressing technology to create a micro-gravure effect on the pattern surface, which not only enhances the tactile layering but also improves the product's anti-counterfeiting performance and artistic value. Furthermore, the innovative application of the flame-retardant bonding layer 401, especially the film structure formed by attaching the flame retardant to BOPE, cleverly solves the technical problem of combining flame retardancy with materials. In the secondary composite bonding process, the BOPE is thermally melted using hot roller pressing technology, allowing the flame retardant to penetrate and firmly connect the various layers, achieving a dual improvement in flame-retardant performance and structural strength, providing strong protection for product safety. Precise cutting of finished products using die-cutting technology not only improves production efficiency but also ensures the standardization and consistency of labels, facilitating subsequent application and management. Overall, this printing process solution achieves the technical goals of efficient, precise, and safe production.

[0046] The substrate layer 10 is made of paper-based material, PVC, or PET. The flame-retardant layer 20 is formed on the substrate layer 10 by coating. The printed pattern layer 30 is coated paper. The surface layer 40 is a transparent film. In this embodiment, paper-based material, PVC, or PET is used as the substrate layer 10 to ensure the stability and durability of the label. These materials are also easy to process and adaptable to various complex environments. The coating process of the flame-retardant layer 20 effectively enhances the fire safety performance of the label, protecting the item to which the label is attached in a fire. The coated paper, as the printed pattern layer 30, not only has vibrant colors and clear patterns but also possesses good waterproof and oil-proof properties, extending the label's service life. The addition of the transparent film further improves the label's wear and scratch resistance while maintaining visual transparency, making the label information readily visible.

[0047] Referring to Figures 5-11, the printing process is completed by printing equipment, which includes a worktable 1, a substrate preparation mechanism 2, a printing pattern preparation mechanism 3, a first composite connection mechanism 4, a micro-gravure printing mechanism 5, a second composite connection mechanism 6, a die-cutting mechanism 7, and a receiving mechanism 8, all mounted on the worktable 1. The substrate preparation mechanism 2 is used for preparing the substrate layer 10 in step S1; the printing pattern preparation mechanism 3 is used for preparing the printing pattern in step S2; the first composite connection mechanism 4 is used for primary composite connection in step S3; the micro-gravure printing mechanism 5 is used for micro-gravure printing in step S4; the second composite connection mechanism 6 is used for preparing the flame-retardant connection layer 401 and secondary composite connection in steps S5-S6; and the die-cutting mechanism 7 is used for label die-cutting in step S7. In this embodiment, the label printing process is automated by the printing equipment. During the preparation process, the substrate preparation mechanism 2 ensures the accurate preparation of the substrate layer 10; the printing pattern preparation mechanism 3 ensures the clarity and accuracy of the printed pattern, meeting complex design requirements. The efficient operation of the first composite bonding mechanism 4 optimizes the stability of the primary composite connection, while the application of the micro-gravure printing mechanism 5 not only enhances the label's texture and visual effect but also strengthens the durability of the printed pattern. The precise control of the second composite bonding mechanism 6 in the preparation of the flame-retardant bonding layer 401 and the secondary composite connection effectively improves the label's flame-retardant performance and overall structural strength, which is of great significance for improving product safety standards. Finally, the precise die-cutting of the die-cutting mechanism 7 ensures the standardization of label dimensions and the smoothness of edges, further enhancing the product's aesthetics and practicality.

[0048] Referring to Figure 8, the substrate preparation mechanism 2 includes a substrate unwinding assembly 21, a substrate stretching assembly 22, a substrate adhesive assembly 23, and a flame-retardant coating assembly 24, sequentially arranged on the worktable 1. In step S1, the substrate unwinding assembly 21 unwinds the substrate layer 10 and stretches it using the substrate stretching assembly 22 to keep the substrate layer 10 flat. Then, the substrate adhesive assembly 23 applies an adhesive coating to both sides of the substrate layer 10 by roller pressing. After coating, the flame-retardant coating assembly applies the coating to the substrate layer 10 to form a flame-retardant layer 20. Specifically, the substrate adhesive assembly 23 is used to roll-coat the adhesive layer on the substrate layer 10 to form a recess in the substrate layer 10. The flame-retardant layer 20 is then applied to the recess by the flame-retardant coating assembly. In this embodiment, the synergistic effect of the substrate unwinding and stretching assemblies ensures the flatness of the substrate layer 10 during subsequent processing. The substrate adhesive assembly 23 uses a roller pressing method to precisely apply adhesive to both sides of the substrate. This not only enhances the interlayer bonding force of the materials but also provides a more stable support surface for the adhesion of the flame-retardant layer 20 through the formation of recessed areas, effectively improving the adhesion strength and durability of the flame-retardant layer 20. The application of the flame-retardant coating assembly 24, which precisely coats the flame-retardant layer 20 on the recessed areas, achieves precise control of flame-retardant performance, enabling the label to maintain excellent fire-retardant properties even in extreme environments.

[0049] Referring to Figure 9, the printing pattern preparation mechanism 3 includes a printing feeding assembly 31, a printing assembly 32, and a drying assembly 33 sequentially arranged on the worktable 1. The printing assembly 32 includes a printing disk 321 and printing modules 322 arranged on the outer periphery of the printing disk 321. At least one set of printing modules 322 is provided. In step S2, the printing feeding assembly 31 is used to feed the printing pattern layer 30 onto the printing disk 321, the printing disk 321 stretches and transmits the printing pattern layer 30, the printing module 322 is used to print the pattern on the printing pattern layer 30, and the drying assembly 33 is used to dry and set the printed pattern layer. In this embodiment, the precise feeding of the printing feeding assembly 31 onto the printing disk 321 achieves the smooth introduction of the flame-retardant material pattern layer. The design of the printing disk 321, utilizing its rotational stretching and transmission function, not only ensures uniform force and smooth transmission of the pattern layer during the printing process, but also effectively avoids printing quality problems caused by material wrinkles or uneven tension. The configuration of multiple printing modules 322 provides flame-retardant labels with diverse pattern printing capabilities, achieving high-precision and high-definition printing effects for both complex patterns and fine lines. This not only enriches the visual expression of flame-retardant labels but also meets the personalized needs of different application scenarios. The drying component 33 ensures that the printed flame-retardant pattern layer can dry and set quickly, effectively shortening the production cycle and avoiding potential problems such as pattern blurring and peeling, further improving the durability and safety of flame-retardant labels.

[0050] Referring to Figure 10, the first composite bonding mechanism 4 includes a first thermal bonding component 41 and a first pressing roller group 42. In step S3, the substrate preparation mechanism 2 conveys the substrate layer 10 prepared in step S1 and the printed pattern layer 30 prepared in step S2 toward the first thermal bonding component 41. The first thermal bonding component 41 rolls the substrate layer 10 and the printed pattern layer 30 together using two sets of rollers with tangent outer diameters. During the rolling process, the rollers are heated so that the printed pattern layer 30 and the substrate layer 10 are bonded together by the adhesive layer 102. In this embodiment, the precise bonding of the two layers of materials during the thermal bonding process is ensured by conveying and aligning the substrate layer 10 and the printed pattern layer 30. The design of the two sets of rollers with tangent outer diameters not only achieves uniform and high-strength rolling, but also effectively activates the adhesive force of the adhesive layer 102 through the heating mechanism, so that the printed pattern layer 30 can be firmly bonded to the substrate layer 10 and is not easy to fall off or peel off.

[0051] The micro-gravure printing mechanism 5 includes a micro-gravure printing roller group 51. In step S4, after completing step S3, the composite-connected substrate layer 10 and the printed pattern layer 30 are fed into the micro-gravure printing roller group 51. The rollers of the micro-gravure printing roller group 51 are provided with printing protrusions 511. The printing protrusions 511 press the pattern on the printed pattern layer 30 towards the roller, making the pattern micro-recessed, and calendering the printed pattern layer 30 and the flame-retardant layer 20. In this embodiment, the printing protrusions 511 effectively achieve reverse micro-recession processing of the pattern in step S4, making the pattern on the printed pattern layer 30 not only clear and sharp-edged, but also presenting a unique three-dimensional recessed effect, enhancing visual depth and tactile experience. Furthermore, the printed pattern layer 30 and the flame-retardant layer 20 are tightly bonded during the calendering process, ensuring a strong adhesion between the flame-retardant layer 20 and the substrate layer 10, while not damaging the integrity of the pattern, effectively extending the service life and weather resistance of the flame-retardant label.

[0052] Referring to Figure 11, the second composite connection mechanism 6 includes a film unwinding assembly 61, a flame-retardant spraying assembly 62, a hot melt leveling assembly 63, a surface unwinding assembly 64, a second thermal composite assembly 65, and a second pressure roller group 66. Specifically, the hot melt leveling assembly 63 includes a hot melt leveling module 631 and a hot melt spray gun 632. The hot melt leveling module 631 includes a fixing plate 6311, an elastic connecting plate 6312, and a hot melt scraper 6313. The fixing plate 6311 is connected to the elastic connecting plate 6312 by the film unwinding assembly 64, a flame-retardant spraying assembly 65, a flame-retardant spraying assembly 66, a flame-retardant spraying assembly 66, a flame-retardant leveling assembly 63, a flame-retardant leveling assembly 64, a flame-retardant leveling assembly 65, and a second pressure roller group 66. 312 is connected to the hot melt scraper 6313, which is equipped with a heating element to heat the scraper 6313. The elastic connecting plate 6312 is made of elastic stainless steel and has an inclined surface that slopes towards the second thermal composite component 65. The hot melt spray gun 632 includes a hot melt connecting frame 6321 and a hot melt nozzle 6322. One end of the hot melt connecting frame 6321 is connected to the fixing plate 6311, and the spraying end of the hot melt nozzle 6322 faces the hot melt scraper 6311. On one side of 3, the end of the hot melt scraper 6313 is provided with an arc-shaped edge 6314, and a support roller 6315 is provided below the hot melt scraper 6313. The outer diameter of the support roller 6315 is tangent to the outer diameter of the arc-shaped edge 6314. In steps S5 to S6, the film unwinding assembly 61 is used to convey the BOPE film toward the flame retardant spraying assembly 62, which is used to spray flame retardant onto the BOPE film. Then, it is conveyed toward the second thermal bonding assembly 65, and the BOPE film sprayed with flame retardant is... The BOPE film is melted by the hot-melt scraper 6313 and the hot-melt nozzle 6322. After melting, the flame retardant and liquid BOPE film are spread evenly on the printed pattern layer 30 by the hot-melt scraper, and integrated into the pattern micro-recessed penetration. Then, it is conveyed towards the second thermal lamination assembly 65. At this time, the surface layer unwinding assembly 64 unwinds the surface layer 40 to the second thermal lamination assembly 65. The second thermal lamination assembly 65 then connects the surface layer 40 to the melted BOPE film. Finally, it is calendered by the second pressing roller group 66. In this embodiment, the flame retardant is precisely sprayed onto the BOPE film by the flame retardant spraying assembly 62, ensuring uniform coverage of the flame retardant and effectively improving the flame retardant rating of the label, giving it higher safety and reliability in various complex environments. The synergistic effect of the hot melt squeegee 6313 and the hot melt nozzle 6322 not only achieves the hot melt treatment of the BOPE film, but also uses the squeegee to firmly and evenly apply the flame retardant and hot melt film onto the printed pattern layer 30, promoting deep integration of the flame retardant and the substrate, and enhancing the overall strength and durability of the label. During the hot melt process, the flame retardant micro-penetrates into the pattern layer. This innovative process not only preserves the clarity of the pattern, but also significantly enhances the adhesion between the pattern and the substrate, avoiding problems such as delamination and bubbling during label use, and improving the product's aesthetics and practicality.The second composite connection mechanism 6 is highly integrated and automated. From unwinding the film material, flame-retardant spraying, hot melt leveling to hot lamination and calendering, each process is seamlessly connected, which greatly shortens the production cycle, reduces labor costs, and improves overall production efficiency.

[0053] The die-cutting mechanism 7 has a cooling and shaping component 71 at its front end. This component cools and shapes the composite material in step S6, then the die-cutting mechanism 7 shapes the label, and finally the receiving mechanism 8 collects the material. In this embodiment, specifically designed for composite materials, it effectively and quickly completes the cooling and shaping process, ensuring the flame-retardant material reaches a stable physical state before die-cutting. This avoids dimensional deviations or deformations caused by thermal expansion and contraction, thus guaranteeing the accuracy and flatness of the label edges. The precisely controlled cooling process promotes a strong bond between the flame-retardant layer 20 and the substrate, enhancing the overall strength and flame-retardant performance of the label, which is particularly important in demanding fire safety applications. The die-cutting mechanism 7 precisely cuts the material according to a preset shape, forming a neat and stable flame-retardant label that meets market demands for high-quality safety markings.

[0054] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A printing process for puncture-resistant and flame-retardant labels, characterized in that: The flame-retardant label includes a puncture-resistant substrate layer, a flame-retardant layer, a printed pattern layer, and a puncture-resistant surface layer arranged sequentially. A release film is provided on the side of the substrate layer opposite to the flame-retardant layer, and an adhesive layer is provided on one side of the substrate layer, with the flame-retardant layer placed inside the adhesive layer. A flame-retardant connecting layer is provided on the surface layer, and the surface layer is connected to the film layer and the printed pattern layer through the flame-retardant connecting layer. The printing process includes the following steps: Step S1, substrate layer preparation: stretch the substrate layer with release film so that the side of the substrate layer opposite to the release film remains flat, apply an adhesive layer to the flat side, apply the adhesive film layer to both sides of the flat side, and then attach the flame retardant layer to one side of the substrate layer. The adhesive layer is used to block the flame retardant layer inside the substrate layer. Step S2, Pattern Preparation: A pattern is printed onto the pattern layer; Step S3, One-time composite bonding: The adhesive layer and the printed pattern layer are bonded together by roller pressing; Step S4, micro-gravure printing: After the substrate layer and the printed pattern layer are rolled together, the printed pattern is rolled on by a micro-gravure printing roller to make the printed pattern micro-gravure. Step S5, Preparation of flame retardant bonding layer: A flame retardant is attached to the BOPE to form a film-like flame retardant bonding layer, and the film-like flame retardant bonding layer is placed between the surface layer and the printed pattern layer. Step S6, Secondary Composite Connection: The surface layer and the printed pattern layer are connected by a film-like flame-retardant connection layer through hot rolling. During the hot melt connection process, the BOPE is hot melted, and the flame retardant follows the hot melted liquid BOPE to penetrate and connect the surface layer, the printed pattern layer, and the micro-recesses of the pattern. Step S7, label die-cutting: The material that has completed the secondary composite connection is cooled and shaped, and then sent to the die-cutting mechanism to form a label. The printing process is completed by printing equipment, which includes a worktable, a substrate preparation mechanism, a printing pattern preparation mechanism, a first composite bonding mechanism, a micro-gravure printing mechanism, a second composite bonding mechanism, a die-cutting mechanism, and a receiving mechanism, all mounted on the worktable. The substrate preparation mechanism is used for substrate layer preparation in step S1; the printing pattern preparation mechanism is used for printing pattern preparation in step S2; the first composite bonding mechanism is used for primary composite bonding in step S3; the micro-gravure printing mechanism is used for micro-gravure printing in step S4; the second composite bonding mechanism is used for flame-retardant bonding layer preparation and secondary composite bonding in steps S5-S6; and the die-cutting mechanism is used for label die-cutting in step S7. The substrate preparation mechanism includes a substrate unwinding assembly, a substrate stretching assembly, a substrate adhesive assembly, and a flame-retardant coating assembly arranged sequentially on the worktable; in step S1, the substrate unwinding assembly unwinds the substrate layer and stretches the substrate by the substrate stretching assembly to keep the substrate layer flat, and then the substrate adhesive assembly applies the adhesive coating to both sides of the substrate layer by roller pressing. After the coating is completed, the flame-retardant coating assembly forms a flame-retardant layer on the substrate layer. The substrate adhesive assembly is used to roll-coat an adhesive layer onto the substrate layer to form a recess on the substrate layer, and the flame retardant layer is applied to the recess by a flame retardant coating assembly.

2. The printing process for the puncture-resistant and flame-retardant label according to claim 1, characterized in that: The substrate layer is made of paper-based material, PVC or PET, and the flame retardant layer is formed on the substrate layer by coating; the printed pattern layer is coated paper; and the surface layer is a transparent film layer.

3. The printing process for the puncture-resistant and flame-retardant label according to claim 1, characterized in that: The printing pattern preparation mechanism includes a printing feeding component, a printing component, and a drying component arranged sequentially on a worktable. The printing component includes a printing disk and a printing module arranged on the outer periphery of the printing disk. At least one set of printing modules is provided. In step S2, the printing feeding assembly is used to feed the printing pattern layer onto the printing disk, the printing disk stretches and transmits the printing pattern layer, the printing module is used to print the pattern on the printing pattern layer, and the drying assembly is used to dry and set the printed pattern layer.

4. The printing process for the puncture-resistant and flame-retardant label according to claim 1, characterized in that: The first composite bonding mechanism includes a first roller composite assembly and a first pressing roller group. In step S3, the substrate preparation mechanism conveys the substrate layer prepared in step S1 and the printed pattern layer prepared in step S2 toward the first thermal composite assembly. The first thermal composite assembly rolls the substrate layer and the printed pattern layer through two sets of roller groups with tangent outer diameters. During the rolling process, the roller groups are heated so that the printed pattern layer and the substrate layer are bonded together through an adhesive layer.

5. The printing process for the puncture-resistant and flame-retardant label according to claim 4, characterized in that: The micro-gravure printing mechanism includes a micro-gravure printing roller group. In step S4, after completing step S3, the composite-connected substrate layer and the printed pattern layer are fed into the micro-gravure printing roller group. The circular roller of the micro-gravure printing roller group is provided with a printing protrusion. The printing protrusion presses the pattern on the printed pattern layer toward the roller so that the pattern is facing the micro-gravure, and the printed pattern layer and the flame retardant layer are calendered.

6. The printing process for the puncture-resistant and flame-retardant label according to claim 5, characterized in that: The second composite bonding mechanism includes a film unwinding assembly, a flame-retardant spraying assembly, a hot melt leveling assembly, a surface unwinding assembly, a second thermal bonding assembly, and a second pressure roller assembly; The hot melt leveling assembly includes a hot melt leveling module and a hot melt spray gun. The hot melt leveling module includes a fixed plate, an elastic connecting plate, and a hot melt scraper. The fixed plate is connected to the hot melt scraper through the elastic connecting plate. The hot melt scraper is provided with a heating tube to heat the hot melt scraper. The elastic connecting plate is an elastic stainless steel plate and is provided with an inclined surface. The inclined surface is inclined towards the second hot composite assembly. The hot melt spray gun includes a hot melt connecting frame and a hot melt nozzle. One end of the hot melt connecting frame is connected to the fixed plate. The spraying end of the hot melt nozzle faces one side of the hot melt scraper. The end of the hot melt scraper is provided with an arc-shaped edge. A support roller is provided below the hot melt scraper. The outer diameter of the support roller is tangent to the outer diameter of the arc-shaped edge. In steps S5 to S6, the film unwinding assembly is used to transport the BOPE film toward the flame retardant spraying assembly, and the flame retardant spraying assembly is used to spray flame retardant onto the BOPE film. Then it is conveyed to the second thermal lamination assembly. The BOPE film coated with flame retardant is thermally melted by the action of the hot melt scraper and hot melt nozzle. After the hot melt, the flame retardant and liquid BOPE film are scraped flat on the printed pattern layer by the hot melt scraper and integrated into the pattern micro-recessed penetration. Then it is conveyed to the second thermal lamination assembly. At this time, the surface layer unwinding assembly unwinds the surface layer to the second thermal lamination assembly. The second thermal lamination assembly then connects the surface layer with the hot melted BOPE film. Finally, it is calendered by the second pressing roller group.

7. The printing process for the puncture-resistant and flame-retardant label according to claim 1, characterized in that: The front end of the die-cutting mechanism is provided with a cooling and shaping component. The cooling and shaping component is used to cool and shape the composite material in step S6, and then the die-cutting mechanism is used to die-cut the label into shape. Finally, the material is collected by the receiving mechanism.

Images