Printing process of puncture-resistant flame-retardant labels

Abstract

The present invention relates to the field of printing technology, and in particular to a printing process for a puncture-resistant flame-retardant label, wherein the flame-retardant label comprises a puncture-resistant substrate layer, a flame-retardant layer, a printed pattern layer and a puncture-resistant surface layer which are arranged in sequence; the substrate layer and the surface layer are bonded to a DuPont film through a composite process, and the firmness and use effect of the label are increased by relying on the puncture-resistant performance of the DuPont film; the processing of the substrate layer in the printing process comprises stretching to ensure the flatness of the surface, and accurately coating an adhesive layer and a mucous film layer thereon, and attaching a flame-retardant layer, which effectively improves the flatness and structural strength of the substrate, and at the same time gives the product excellent flame-retardant performance; the present invention achieves a dual improvement in flame-retardant performance and structural strength, and provides a strong guarantee for product safety.

Description

Technical Field

[0001] The invention relates to the technical field of printing, in particular to a printing process for a puncture-resistant flame-retardant label. Background Art

[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 on various materials (such as paper, plastic film, metal foil, etc.) through a specific printing process. This process not only requires the printing content to be accurate, but also requires the label to be wear-resistant, water-resistant, chemical-resistant and other properties to meet the diverse needs of different industries for product identification, tracking, management and promotion.

[0003] In the field of label printing, common printing methods include flexographic printing, letterpress printing, gravure printing, digital printing (such as inkjet printing, laser printing) and electron beam printing that has emerged in recent years. With the advancement of science and technology, the label printing industry is also constantly integrating new technologies, such as the introduction of intelligent identification technology and anti-counterfeiting technology, so that labels not only carry basic information, but also have anti-counterfeiting traceability, intelligent interaction and other functions, which greatly enhances the added value and market competitiveness of products. In the existing technology, some printed labels have flame retardant and fireproof functions. The existing flame retardant and fireproof labels are relatively complicated in the preparation process, do not have anti-puncture effect, and have low preparation efficiency. Therefore, new improvements need to be made to the existing label production. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a printed label and a printing process thereof by attaching a flame retardant layer, which effectively improves the flatness and structural strength of the substrate and at the same time gives the product excellent flame retardant performance.

[0005] The technical solution adopted by the present invention is: a printing process of a puncture-resistant flame-retardant label, the flame-retardant label comprises a substrate layer, a flame-retardant layer, a printed pattern layer and a surface layer arranged in sequence; a release film is arranged on a side of the substrate layer opposite to the flame-retardant layer, an adhesive layer is arranged on one side of the substrate layer, and the flame-retardant layer is arranged in the adhesive layer; a flame-retardant connecting layer is arranged 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, preparation of substrate layer: stretching the substrate layer with the release film so that the side of the substrate layer opposite to the release film remains flat, coating the flat side with an adhesive layer, coating the adhesive layer on both sides of the flat side, and then attaching a flame retardant layer to one side of the substrate layer, wherein the adhesive layer is used to isolate the flame retardant layer within the substrate layer;

[0008] Step S2, printing pattern preparation: printing a pattern on the printing pattern layer;

[0009] Step S3, primary composite connection: compositely connecting the adhesive layer and the printed pattern layer by rolling;

[0010] Step S4, micro-concave printing: after the substrate layer and the printing pattern layer are connected by roller pressing, a micro-concave printing roller is rolled on the printing pattern to make the printed pattern micro-concave;

[0011] Step S5, preparation of flame retardant connecting layer: attaching flame retardant to BOPE to form a film-like flame retardant connecting layer, and placing the film-like flame retardant connecting layer between the surface layer and the printed pattern layer;

[0012] Step S6, secondary composite connection: connect the surface layer and the printed pattern layer through a film-like flame-retardant connection layer by hot rolling, and make BOPE melt in the hot-melt connection process, and the flame retardant penetrates with the hot-melted liquid BOPE and connects the surface layer and the printed pattern layer and the pattern micro-concave;

[0013] Step S7, label die-cutting, cooling and shaping the material after the secondary composite connection, and then sending it to the die-cutting mechanism, and the die-cutting mechanism die-cuts the material to form a label.

[0014] A further improvement to the above scheme 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 a printing device, which includes a workbench, a substrate preparation mechanism arranged on the workbench, a printing pattern preparation mechanism, a first composite connection mechanism, a micro-concave printing mechanism, a second composite connection mechanism, a die-cutting mechanism and a material receiving mechanism; the substrate preparation mechanism is used for the substrate layer preparation in step S1; the printing pattern preparation mechanism is used for the printing pattern preparation in step S2; the first composite connection mechanism is used for the primary composite connection in step S3; the micro-concave printing mechanism is used for the micro-concave printing in step S4, and the second composite connection mechanism is used for the flame-retardant connection layer preparation and secondary composite connection in steps S5 to S6; the die-cutting mechanism is used for the label die-cutting molding in step S7.

[0016] A further improvement to the above scheme is that the substrate preparation mechanism includes a substrate unwinding component, a substrate stretching component, a substrate viscose component and a flame retardant coating component which are sequentially arranged on a workbench; in the step S1, the substrate unwinding component unwinds the substrate layer, and stretches the substrate through the substrate stretching component to keep the substrate layer flat, and then the substrate viscose component applies the adhesive coating on both sides of the substrate layer by rolling, and after the coating is completed, a flame retardant layer is formed on the substrate layer through the flame retardant coating component.

[0017] A further improvement to the above scheme is that the substrate adhesive component is used to roll-coat the adhesive layer on the substrate layer to form a recessed portion on the substrate layer, and the flame retardant layer is coated on the recessed portion by a flame retardant coating component.

[0018] A further improvement to the above scheme is that the printing pattern preparation mechanism includes a printing discharge component, a printing component and a drying component which are sequentially arranged on a workbench, the printing component includes a printing disc and a printing module arranged on the outer circumference of the printing disc, and the printing module is provided with at least one group; in the step S2, the printing discharge component is used to discharge the printing pattern layer to the printing disc, the printing disc stretches and transfers the printing pattern layer, the printing module is used to print a pattern on the printing pattern layer, and the drying component is used to dry and shape the pattern layer after printing.

[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 transports the substrate layer prepared in step S1 and the printing pattern layer prepared in step S2 toward the first thermal composite assembly. The first thermal composite assembly rolls the substrate layer and the printing pattern layer through two groups of rollers with tangent outer diameters. The roller group is heated during the rolling process so that the printing pattern layer and the substrate layer are bonded through the adhesive layer.

[0020] A further improvement to the above scheme is that the micro-concave printing mechanism includes a micro-concave printing roller group. In the step S4, after completing step S3, the composite connected substrate layer and the printing pattern layer are fed into the micro-concave printing roller group. A printing convex edge is provided on the round roller of the micro-concave printing roller group. The printing convex edge presses the pattern on the printing pattern layer toward the roller so that the pattern faces the micro-concave, and the printing 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 material unwinding component, a flame retardant spraying component, a hot melt scraping component, a surface unwinding component, a second thermal composite component and a second pressing roller group.

[0022] A further improvement to the above scheme is that the hot melt scraping component includes a hot melt scraping module and a hot melt spray gun, the hot melt scraping 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, a heating tube is arranged on the hot melt scraper 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 toward the second thermal composite component, 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 ejection 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 edge, a support roller is arranged below the hot melt scraper, and the outer diameter of the support roller is tangent to the outer diameter of the arc edge.

[0023] A further improvement to the above scheme is that in steps S5~S6, the film material 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 the flame retardant on the BOPE film; then it is transported toward the second thermal composite assembly, and the BOPE film sprayed with the flame retardant is hot-melted by the hot melt scraper and the hot melt nozzle. After hot melting, the flame retardant and the liquid BOPE film are scraped flat on the printed pattern layer by the hot melt scraper, and are integrated into the pattern micro-concave penetration, and then transported toward the second thermal composite assembly, at this time, the surface unwinding assembly discharges the surface layer to the second thermal composite assembly, and at this time, the second thermal composite assembly connects the surface layer with the hot-melted BOPE film, and finally calendered by the second pressing 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, and the cooling and shaping component is used to complete the cooling and shaping of the composite connected materials in step S6, and then die-cut the shape of the label through the die-cutting mechanism, and finally collect the materials through the collecting mechanism.

[0025] The beneficial effects of the present invention are:

[0026] Compared with existing labels, the combination of the substrate layer and the flame retardant layer of the present invention effectively improves the safety performance of the product and is suitable for scenarios requiring high fire protection requirements. The provision of a release film facilitates the flexible operation of the label during production, processing and subsequent applications, thereby improving production efficiency and finished product quality. The design of the adhesive layer around the flame retardant layer ensures a firm fit between the label and the attachment surface, and maintains good adhesion even in harsh environments, thereby extending the service life. At the same time, the layout of the flame retardant layer within the adhesive layer further enhances the overall flame retardant effect and forms a full range of safety protection. The flame retardant connecting layer introduced into the surface layer not only enhances the connection strength with the coating layer and the printed pattern layer, but also maintains the overall flame retardant properties, making the label visually beautiful while also having excellent practical functions. Both the surface layer and the substrate layer are DuPont films, which effectively improve the puncture resistance of the label itself, thereby enhancing the firmness and durability of the structure.

[0027] The processing of the substrate layer in the printing process includes stretching to ensure the surface is flat, and the adhesive layer and mucosa layer are accurately coated on it, as well as the flame retardant layer is attached, which effectively improves the flatness and structural strength of the substrate, while giving the product excellent flame retardant properties. Secondly, the introduction of the printed pattern layer combined with fine printing technology ensures the clarity and color reproduction of the pattern, meeting the diverse and high-standard visual presentation requirements. The subsequent micro-concave printing step is to form a micro-concave effect on the surface of the pattern through roller pressing technology, which not only enhances the layered touch, but also improves the anti-counterfeiting performance and artistic value of the product. Furthermore, the innovative application of the flame retardant connecting layer, especially the film structure formed by attaching the flame retardant to BOPE, solves the technical difficulties of combining flame retardancy with materials. In the secondary composite connection process, the hot roller pressing technology is used to make BOPE hot melt, and the flame retardant then penetrates and firmly connects the layers of materials, achieving a dual improvement in flame retardant performance and structural strength, providing a strong guarantee for product safety. The precise cutting of the finished product through the die-cutting process not only improves production efficiency, but also ensures the standardization and consistency of the label, which is convenient for subsequent application and management. Overall, the printing process solution achieves efficient, precise and safe production goals at the technical level. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the flame retardant label of the present invention;

[0029] Figure 2 for Figure 1 A structural diagram of the flame retardant label from another perspective;

[0030] Figure 3 for Figure 1 Schematic diagram of the preparation process of flame retardant labels;

[0031] Figure 4 It is a schematic diagram of the process of printing the puncture-resistant flame-retardant label of the present invention;

[0032] Figure 5 It is a three-dimensional schematic diagram of the printing device of the present invention;

[0033] Figure 6 for Figure 5 A three-dimensional schematic diagram of another perspective of the printing device;

[0034] Figure 7 for Figure 5 A schematic diagram of the main view of the printing equipment;

[0035] Figure 8 for Figure 7 A is an enlarged schematic diagram;

[0036] Fig. 9 for Figure 7 The enlarged schematic diagram of point B in FIG.

[0037] Fig.10 for Figure 7 The enlarged schematic diagram of point C in FIG.

[0038] Fig.11 for Figure 7 The enlarged schematic diagram of point D in FIG.

[0039] Description of reference numerals: substrate layer 10, release film 101, adhesive layer 102, flame retardant layer 20, printed pattern layer 30, surface layer 40, flame retardant connecting layer 401;

[0040] Workbench 1, substrate preparation mechanism 2, substrate unwinding assembly 21, substrate stretching assembly 22, substrate adhesive assembly 23, flame retardant coating assembly 24, printing pattern preparation mechanism 3, printing unwinding assembly 31, printing assembly 32, printing disc 321, printing module 322, drying assembly 33, first composite connection mechanism 4, first thermal composite assembly 41, first pressing roller group 42, micro-concave printing mechanism 5, micro-concave printing roller group 51, printing convex edge 511, second composite connection mechanism Structure 6, film material unwinding component 61, flame retardant spraying component 62, hot melt connecting frame 6321, hot melt nozzle 6322, hot melt scraping component 63, hot melt scraping module 631, fixed plate 6311, elastic connecting plate 6312, hot melt scraper 6313, arc edge 6314, support roller 6315, hot melt spray gun 632, surface unwinding component 64, second thermal composite component 65, second clamping roller group 66, die-cutting mechanism 7, cooling and shaping component 71, and material receiving mechanism 8. DETAILED DESCRIPTION

[0041] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0042] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Figure 1 to Figure 11As shown, in one embodiment of the present invention, a printing process of a puncture-resistant flame-retardant label is involved, and 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 in sequence; a release film 101 is arranged on the side of the substrate layer 10 opposite to the flame-retardant layer 20, and an adhesive layer 102 is arranged on one side of the substrate layer 10, and the flame-retardant layer 20 is placed in the adhesive layer 102; the surface layer 40 is provided with a flame-retardant connecting layer 401, and the surface layer 40 is connected to the coating layer and the printed pattern layer 30 through the flame-retardant connecting layer 401; the combination of the substrate layer 10 and the flame-retardant layer 20 of this embodiment effectively improves the safety performance of the product, and is suitable for scenes requiring high fire protection requirements. The provision of the release film 101 facilitates the flexible operation of the label in production, processing and subsequent applications, and improves production efficiency and finished product quality. The design of the adhesive layer 102 on the periphery of the flame-retardant layer 20 ensures that the label fits firmly with the attachment surface, maintains good adhesion even in harsh environments, and prolongs the service life. At the same time, the layout of the flame retardant layer 20 in the adhesive layer 102 further strengthens the overall flame retardant effect and forms a full range of safety protection. The flame retardant connecting layer 401 introduced into the surface layer 40 not only enhances the connection strength with the coating layer and the printed pattern layer 30, but also maintains the overall flame retardant properties, making the label visually beautiful while also having excellent practical functions.

[0044] The printing process includes the following steps: step S1, preparation of substrate layer 10: stretching the substrate layer 10 with release film 101 so that the side of the substrate layer 10 opposite to the release film 101 remains flat, coating the adhesive layer 102 on the flat side, coating the adhesive layer on both sides of the flat side, and then attaching the flame retardant layer 20 to one side of the substrate layer 10, wherein the adhesive layer 102 is used to block the flame retardant layer 20 in the substrate layer 10; step S2, preparation of printing pattern: printing a pattern on the printing pattern layer 30; step S3, one-time composite connection: compositely connecting the adhesive layer 102 and the printing pattern layer 30 by rolling; step S4, micro-concave printing: after the substrate layer 10 and the printing pattern layer 30 are rolled and connected, the micro-concave printing roller is used to print the printing pattern on the printing pattern layer 30; Roller pressing is performed on the BOPE to make the printed pattern slightly concave; step S5, preparation of flame-retardant connecting layer 401: flame retardant is attached to BOPE to form a film-like flame-retardant connecting layer 401, and the film-like flame-retardant connecting layer 401 is placed between the surface layer 40 and the printed pattern layer 30; step S6, secondary composite connection: the surface layer 40 and the printed pattern layer 30 are connected through the film-like flame-retardant connecting layer 401 by hot rolling, and the BOPE is hot-melted during the hot-melt connection process, and the flame retardant penetrates with the liquid BOPE after hot-melt and connects the surface layer 40 and the printed pattern layer 30 as well as the pattern micro-concave; step S7, label die-cutting, the material that has completed the secondary composite connection is cooled and shaped, and after cooling and shaping, it is sent to the die-cutting mechanism, and the material is die-cut by 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 that the surface is flat, and the adhesive layer 102 and the mucosal layer are accurately coated thereon, and the flame retardant layer 20 is attached, which effectively improves the flatness and structural strength of the substrate, and at the same time gives the product excellent flame retardant properties, laying a solid foundation for subsequent processing. Secondly, the introduction of the printed pattern layer 30 and the combination of fine printing technology ensure the clarity and color reproduction of the pattern, and meet the diverse and high-standard visual presentation requirements. The subsequent micro-concave printing step is to form a micro-concave effect on the pattern surface through roller pressing technology, which not only enhances the layering of the touch, but also improves the anti-counterfeiting performance and artistic value of the product. Furthermore, the innovative application of the flame retardant connecting layer 401, especially the film-like structure formed by attaching the flame retardant to BOPE, cleverly solves the technical difficulties of combining flame retardancy with materials. In the secondary composite connection process, the hot rolling technology is used to make BOPE hot melt, and the flame retardant then penetrates and firmly connects the layers of materials, achieving a dual improvement in flame retardancy and structural strength, providing a strong guarantee for product safety. The die-cutting process can accurately cut the finished product, which not only improves production efficiency, but also ensures the standardization and consistency of the labels, which is convenient for subsequent application and management. Overall, the printing process solution has achieved the production goals of high efficiency, precision and safety at the technical level.

[0046] The substrate layer 10 is made of paper-based material, PVC or PET, and the flame retardant layer 20 is formed on the substrate layer 10 by coating; the printed pattern layer 30 is a laminated paper; and the surface layer 40 is a transparent film layer. 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. At the same time, these materials are easy to process and adapt to a variety of complex environments. The coating process of the flame retardant layer 20 effectively enhances the fire safety performance of the label and protects the safety of the items to which the label is attached in a fire. Laminated paper is used as the printed pattern layer 30, which is not only brightly colored and has clear patterns, but also has good waterproof and oil-proof properties, which prolongs the service life of the label. The addition of a transparent film layer on the surface further improves the wear resistance and scratch resistance of the label, while maintaining a visual sense of transparency, so that the label information is clear at a glance.

[0047] See also Figure 5~Figure 11As shown, the printing process is completed by a printing device, which includes a workbench 1, a substrate preparation mechanism 2 arranged on the workbench 1, a printing pattern preparation mechanism 3, a first composite connection mechanism 4, a micro-concave printing mechanism 5, a second composite connection mechanism 6, a die-cutting mechanism 7 and a material receiving mechanism 8; the substrate preparation mechanism 2 is used for the preparation of the substrate layer 10 in step S1; the printing pattern preparation mechanism 3 is used for the preparation of the printing pattern in step S2; the first composite connection mechanism 4 is used for the primary composite connection in step S3; the micro-concave printing mechanism 5 is used for the micro-concave printing in step S4, and the second composite connection mechanism 6 is used for the preparation of the flame-retardant connection layer 401 and the secondary composite connection in steps S5 to S6; the die-cutting mechanism 7 is used for the die-cutting of the label in step S7. In this embodiment, the printing process of the label is completed automatically by the printing device; 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 printing pattern to meet the complex design requirements. The efficient operation of the first composite connection mechanism 4 optimizes the stability of the primary composite connection, and the application of the micro-concave printing mechanism 5 not only improves the texture and visual effect of the label, but also enhances the durability of the printed pattern. The precise control of the second composite connection mechanism 6 in the preparation of the flame-retardant connection layer 401 and the secondary composite connection effectively improves the flame retardant performance and overall structural strength of the label, which is of great significance for improving product safety standards. Finally, the precise die-cutting molding of the die-cutting mechanism 7 ensures the standardization of the label size and the smoothness of the edge, further improving the aesthetics and practicality of the product.

[0048] See also Figure 8As shown, the substrate preparation mechanism 2 includes a substrate unwinding component 21, a substrate stretching component 22, a substrate adhesive component 23 and a flame retardant coating component 24 which are sequentially arranged on the workbench 1; in the step S1, the substrate unwinding component 21 unwinds the substrate layer 10, and stretches the substrate through the substrate stretching component 22 to keep the substrate layer 10 flat, and then the substrate adhesive component 23 applies the adhesive coating on both sides of the substrate layer 10 by rolling, and after the coating is completed, the flame retardant coating component is applied on the substrate layer 10 to form a flame retardant layer 20. Specifically, the substrate adhesive component 23 is used to roll the adhesive layer on the substrate layer 10 to form a recessed portion on the substrate layer 10, and the flame retardant layer 20 is applied on the recessed portion by the flame retardant coating component. In this embodiment, the flatness of the substrate layer 10 in the subsequent processing process is ensured by the synergistic effect of the substrate unwinding and stretching components. The substrate adhesive component 23 uses a roller pressing method to accurately apply the adhesive on both sides of the substrate, which not only enhances the interlayer bonding strength of the material, but also provides a more stable support surface for the attachment of the flame retardant layer 20 by forming a recessed portion design, effectively improving the adhesion strength and durability of the flame retardant layer 20. The application of the flame retardant coating component 24 accurately coats the flame retardant layer 20 on the recessed portion, achieving precise control of the flame retardant performance, so that the label can still maintain excellent fire retardant performance in extreme environments.

[0049] See also Fig. 9 As shown, the printing pattern preparation mechanism 3 includes a printing feeding component 31, a printing component 32 and a drying component 33 which are sequentially arranged on the workbench 1, wherein the printing component 32 includes a printing disc 321 and a printing module 322 arranged on the periphery of the printing disc 321, wherein the printing module 322 is provided with at least one group of printing modules 322; in the step S2, the printing feeding component 31 is used to feed the printing pattern layer 30 to the printing disc 321, the printing disc 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 component 33 is used to dry and shape the pattern layer after printing. In this embodiment, the flame retardant material pattern layer is smoothly introduced by the precise feeding of the printing feeding component 31 to the printing disc 321. The design of the printing disc 321, by utilizing its rotating stretching transmission function, not only ensures the uniform force and smooth transmission of the pattern layer during the printing process, but also effectively avoids the printing quality problems caused by material wrinkles or uneven tension. The configuration of multiple printing modules 322 provides a variety of pattern printing capabilities for flame retardant labels, and can achieve 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 in different application scenarios. The drying component 33 ensures that the flame retardant pattern layer can be quickly dried and fixed after printing, effectively shortening the production cycle, while avoiding potential problems such as pattern blurring and falling off, further improving the durability and safety of flame retardant labels.

[0050] See also Fig.10 As shown, the first composite connection mechanism 4 includes a first thermal composite component 41 and a first pressing roller group 42. In the step S3, the substrate preparation mechanism 2 transports the substrate layer 10 prepared in step S1 and the printing pattern layer 30 prepared in step S2 toward the first thermal composite component 41. The first thermal composite component 41 rolls the substrate layer 10 and the printing pattern layer 30 through two groups of rollers with tangent outer diameters. The rollers are heated during the rolling process so that the printing pattern layer 30 and the substrate layer 10 are bonded through the adhesive layer 102. In this embodiment, the precise combination of the two layers of materials during the thermal composite process is ensured by conveying and aligning the substrate layer 10 and the printing pattern layer 30. The design of the two groups 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 printing 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-concave printing mechanism 5 includes a micro-concave printing roller group 51. In the step S4, after completing step S3, the composite connected substrate layer 10 and the printed pattern layer 30 are fed into the micro-concave printing roller group 51. The round roller of the micro-concave printing roller group 51 is provided with a printing convex edge 511. The printing convex edge 511 rolls the pattern on the printed pattern layer 30 so that the pattern faces the micro-concave, and the printed pattern layer 30 and the flame retardant layer 20 are calendered. In this embodiment, the reverse micro-concave treatment of the pattern can be effectively achieved in step S4 by printing the convex edge 511, so that the pattern on the printed pattern layer 30 is not only high in clarity and sharp in edge, but also presents a unique three-dimensional concave effect, which enhances the visual hierarchy and tactile experience. In addition, the printed pattern layer 30 and the flame retardant layer 20 are closely combined during the calendering process, ensuring the firm 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] See also Fig.11As shown, the second composite connection mechanism 6 includes a film material unwinding component 61, a flame retardant spraying component 62, a hot melt scraping component 63, a surface unwinding component 64, a second thermal composite component 65 and a second pressing roller group 66; specifically, the hot melt scraping component 63 includes a hot melt scraping module 631 and a hot melt spray gun 632, the hot melt scraping module 631 includes a fixed plate 6311, an elastic connecting plate 6312 and a hot melt scraper 6313, the fixed plate 6311 is connected to the elastic connecting plate 6312 through the The hot melt scraper 6313 is connected, and a heating pipe is arranged on the hot melt scraper 6313 to heat the hot melt scraper 6313. The elastic connecting plate 6312 is an elastic stainless steel plate and is provided with an inclined surface, and the inclined surface is inclined toward 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 ejection end of the hot melt nozzle 6322 is toward one end of the hot melt scraper 6313. On the side, the end of the hot melt scraper 6313 is provided with an arc edge 6314, and a support roller 6315 is provided below the hot melt scraper 6313, and the outer diameter of the support roller 6315 is tangent to the outer diameter of the arc edge 6314; in steps S5-S6, the film material unwinding component 61 is used to transport the BOPE film toward the flame retardant spraying component 62, and the flame retardant spraying component 62 is used to spray the flame retardant on the BOPE film; then it is transported toward the second thermal composite component 65, and the BOPE film sprayed with the flame retardant is The BOPE film is melted by the hot melt scraper 6313 and the hot melt nozzle 6322. After the hot melt, the flame retardant and the liquid BOPE film are scraped flat on the printed pattern layer 30 by the hot melt scraper, and penetrated into the pattern micro-concave, and then transported toward the second thermal composite component 65. At this time, the surface unwinding component 64 discharges the surface layer 40 to the second thermal composite component 65. At this time, the second thermal composite component 65 connects the surface layer 40 with the hot-melted BOPE film, and finally calenders it through the second pressing roller group 66. In this embodiment, the flame retardant is accurately sprayed on the BOPE film by the flame retardant spraying component 62, ensuring uniform coverage of the flame retardant, effectively improving the flame retardant level of the label, and making it have higher safety and reliability in various complex environments. The synergistic effect of the hot melt scraper 6313 and the hot melt nozzle 6322 not only achieves the hot melt treatment of the BOPE film, but also scrapes the flame retardant and the hot melt film tightly on the printed pattern layer 30 through the scraper, promoting the deep fusion 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-concave penetrates into the pattern layer. This innovative process not only retains the clarity of the pattern, but also significantly enhances the adhesion between the pattern and the substrate, avoiding problems such as delamination and blistering during the use of the label, and improving the aesthetics and practicality of the product.The second composite connection mechanism 6 is highly integrated and highly automated. From film unwinding, flame retardant spraying, hot melt scraping to thermal composite and calendering, each process is seamlessly connected, which greatly shortens the production cycle, reduces labor costs, and improves overall production efficiency.

[0053] The front end of the die-cutting mechanism 7 is provided with a cooling and shaping component 71, and the cooling and shaping component 71 is used to complete the cooling and shaping of the composite-connected materials in step S6, and then die-cut the shape of the label through the die-cutting mechanism 7, and finally collect the material through the receiving mechanism 8. In this embodiment, it is specially designed for the composite-connected materials, and can effectively and quickly complete the cooling and shaping process, ensuring that the flame-retardant material reaches a stable physical state before die-cutting, avoiding dimensional deviation or deformation caused by thermal expansion and contraction of the material, thereby ensuring the accuracy and flatness of the label edge. The precisely controlled cooling process promotes the firm bonding between the flame-retardant layer 20 and the substrate, and enhances the overall strength and flame-retardant performance of the label, which is particularly important for the field of fire safety with strict requirements. The die-cutting mechanism 7 accurately cuts according to the preset shape to form a flame-retardant label with a regular appearance and stable performance, meeting the market demand for high-quality safety labels.

[0054] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A printing process for puncture-resistant flame-retardant labels, characterized in that: The flame retardant label comprises a puncture-resistant substrate layer, a flame retardant layer, a printed pattern layer and a puncture-resistant surface layer which are arranged in sequence; a release film is arranged on the side of the substrate layer which is opposite to the flame retardant layer, an adhesive layer is arranged on one side of the substrate layer, and the flame retardant layer is arranged in the adhesive layer; a flame retardant connecting layer is arranged 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; The printing process includes the following steps: Step S1, preparation of substrate layer: stretching the substrate layer with the release film so that the side of the substrate layer opposite to the release film remains flat, coating the flat side with an adhesive layer, coating the adhesive layer on both sides of the flat side, and then attaching a flame retardant layer to one side of the substrate layer, wherein the adhesive layer is used to isolate the flame retardant layer within the substrate layer; Step S2, printing pattern preparation: printing a pattern on the printing pattern layer; Step S3, primary composite connection: compositely connecting the adhesive layer and the printed pattern layer by rolling; Step S4, micro-concave printing: after the substrate layer and the printing pattern layer are connected by roller pressing, a micro-concave printing roller is rolled on the printing pattern to make the printed pattern micro-concave; Step S5, preparation of flame retardant connecting layer: attaching flame retardant to BOPE to form a film-like flame retardant connecting layer, and placing the film-like flame retardant connecting layer between the surface layer and the printed pattern layer; Step S6, secondary composite connection: connect the surface layer and the printed pattern layer through a film-like flame-retardant connection layer by hot rolling, and make BOPE melt in the hot-melt connection process, and the flame retardant penetrates with the hot-melted liquid BOPE and connects the surface layer and the printed pattern layer and the pattern micro-concave; Step S7, label die-cutting, cooling and shaping the material after the secondary composite connection, and then feeding it to the die-cutting mechanism, where the material is die-cut to form a label; The printing process is completed by a printing device, which includes a workbench, a substrate preparation mechanism arranged on the workbench, a printing pattern preparation mechanism, a first composite connection mechanism, a micro-concave printing mechanism, a second composite connection mechanism, a die-cutting mechanism and a material receiving mechanism; the substrate preparation mechanism is used for the substrate layer preparation in step S1; the printing pattern preparation mechanism is used for the printing pattern preparation in step S2; the first composite connection mechanism is used for the primary composite connection in step S3; the micro-concave printing mechanism is used for the micro-concave printing in step S4; the second composite connection mechanism is used for the flame-retardant connection layer preparation and the secondary composite connection in steps S5 to S6; the die-cutting mechanism is used for the label die-cutting molding in step S7; The substrate preparation mechanism comprises a substrate unwinding assembly, a substrate stretching assembly, a substrate adhesive assembly and a flame retardant coating assembly which are sequentially arranged on a workbench; in the step S1, the substrate unwinding assembly unwinds the substrate layer, and the substrate is stretched by the substrate stretching assembly to keep the substrate layer flat, and then the substrate adhesive assembly applies adhesive coating on both sides of the substrate layer by rolling, and after the coating is completed, the flame retardant coating assembly forms a flame retardant layer on the substrate layer; The substrate adhesive component is used to roll-coat the adhesive layer on the substrate layer to form a recessed portion on the substrate layer, and the flame retardant layer is coated on the recessed portion by the flame retardant coating component.

2. The printing process of the puncture-resistant 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 laminated paper; and the surface layer is a transparent film layer.

3. The printing process of the puncture-resistant flame-retardant label according to claim 1, characterized in that: The printing pattern preparation mechanism comprises a printing material discharging component, a printing component and a drying component which are sequentially arranged on a workbench, the printing component comprises a printing disc and a printing module arranged on the periphery of the printing disc, the printing module is provided with at least one group, the printing module; In step S2, the printing feeding component is used to feed the printing pattern layer to the printing disc, the printing disc stretches and transfers 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 shape the printed pattern layer.

4. The printing process of the puncture-resistant flame-retardant label according to claim 1, characterized in 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 transports the substrate layer prepared in step S1 and the printing pattern layer prepared in step S2 toward the first thermal composite assembly. The first thermal composite assembly rolls the substrate layer and the printing pattern layer through two groups of rollers with tangent outer diameters. The roller group is heated during the rolling process so that the printing pattern layer and the substrate layer are bonded through the adhesive layer.

5. The printing process of the puncture-resistant flame-retardant label according to claim 4, characterized in that: The micro-concave printing mechanism includes a micro-concave printing roller group. In the step S4, after completing step S3, the composite connected substrate layer and the printing pattern layer are sent to the micro-concave printing roller group. The round roller of the micro-concave printing roller group is provided with a printing convex edge. The printing convex edge rolls the pattern on the printing pattern layer toward the micro-concave, so that the pattern faces the micro-concave, and the printing pattern layer and the flame retardant layer are calendered.

6. The printing process of the puncture-resistant flame-retardant label according to claim 5, characterized in that: The second composite connection mechanism includes a film material unwinding assembly, a flame retardant spraying assembly, a hot melt scraping assembly, a surface unwinding assembly, a second thermal composite assembly and a second pressing roller assembly; The hot melt scraping assembly comprises a hot melt scraping module and a hot melt spray gun, the hot melt scraping module comprises 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, a heating pipe is arranged on the hot melt scraper 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 toward the second thermal composite assembly, the hot melt spray gun comprises a hot melt connecting frame and a hot melt spray head, one end of the hot melt connecting frame is connected to the fixed plate, the spraying end of the hot melt spray head faces one side of the hot melt scraper, the end of the hot melt scraper is provided with an arc edge, a support roller is arranged below the hot melt scraper, and the outer diameter of the support roller is tangent to the outer diameter of the arc edge; In steps S5-S6, the film material 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 the flame retardant on the BOPE film; Then it is transported to the second thermal composite component, and the BOPE film sprayed with flame retardant is hot-melted by the hot melt scraper and the hot melt nozzle. After hot melting, the flame retardant and the liquid BOPE film are scraped flat on the printed pattern layer by the hot melt scraper, and integrated into the pattern micro-concave infiltration, and then transported to the second thermal composite component. At this time, the surface unwinding component discharges the surface layer to the second thermal composite component. At this time, the second thermal composite component connects the surface layer with the hot-melted BOPE film, and finally calendered through the second pressing roller group.

7. The printing process of the puncture-resistant 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, which is used to complete the cooling and shaping of the composite connected materials in step S6, and then die-cut the shape of the label through the die-cutting mechanism, and finally collect the materials through the collecting mechanism.

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