An environmentally-friendly paper label and stationery set integrated printing forming method and paper product

Abstract

The application relates to the field of printing forming technology, and provides an environment-friendly paper label and stationery set integrated printing forming method and a paper product. The application synchronously performs printing and contour die cutting on a main body area and an auxiliary area on the same continuous base material, and a local connection structure is reserved on the edge of the auxiliary area during the contour die cutting process, so that the auxiliary area is physically connected with the continuous base material. The continuous base material, the main body area and the auxiliary area are bonded, solidified and shaped in the state of physical connection. The application eliminates a secondary alignment and bonding process, improves graphic text register accuracy and production efficiency, and takes into account green environmental protection and product consistency.

Description

Technical Field

[0001] This invention belongs to the field of printing and molding technology, and particularly relates to an integrated printing and molding method for environmentally friendly paper labels and stationery sets, as well as the paper products thereof. Background Technology

[0002] With the continued growth in market demand for eco-friendly stationery sets and matching paper labels for home and office use, the greening and integration of their printing and bonding processes have become a key focus of the industry. Traditional production often employs a separate processing and post-assembly model, which is cumbersome and makes it difficult to balance environmental friendliness with high yield rates. To address this pain point, existing environmentally friendly processes are often optimized through upgrades and improvements to specialized ink formulations and green printing processes. For example, patent publication number CN111004542A, entitled "A Biodegradable Film Water-Based Printing Ink and Its Preparation Method," describes an invention patent that prepares biodegradable water-based ink by compounding multiple types of water-based acrylic resins with environmentally friendly additives, reducing VOC emissions at the source. Another example is patent publication number CN113212016A, entitled "A Printing Process for Environmentally Friendly Green Paper Products," which optimizes the entire printing process for paper products, matches specialized ink ratios, and improves printing adhesion strength and product weather resistance.

[0003] However, the aforementioned technical solutions still have significant limitations in actual mass production: While patent CN111004542A achieves solvent-free and biodegradable inks, it only focuses on ink formulation improvement and does not integrate the characteristics of stationery and label production, thus failing to meet the printing needs of various sizes and irregular shapes of stationery; while patent CN113212016A improves the printing process and ink compatibility logic for paper products, it still follows a step-by-step processing approach and has not broken through the barriers between printing, die-cutting, forming, and laminating processes. Furthermore, existing environmental improvements are mostly single-stage optimizations, lacking an integrated line design for printing, forming, die-cutting, and laminating. In small-batch customization scenarios, line changeover costs are high, and process transfer waiting times are long. Simultaneously, a quantitative control model for material utilization and laminating accuracy has not been established, resulting in a high proportion of waste material during production, easily leading to label misalignment, peeling, and detachment. Moreover, it is difficult to simultaneously meet the multiple demands of production efficiency, environmental protection, and product consistency; localized process improvements cannot fundamentally solve the inherent shortcomings of traditional production models. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an integrated printing and molding method for environmentally friendly paper labels and stationery sets, as well as the paper product itself. The proposed solution enables simultaneous printing and integrated molding of labels and stationery sets, eliminating the need for post-installation bonding and assembly, simplifying the process, reducing costs, and simultaneously improving the environmental friendliness and consistency of the product.

[0005] To achieve the above objectives, this invention provides an integrated printing and molding method for environmentally friendly paper labels and stationery sets, used to produce paper products. The paper products include a main body area and auxiliary areas. The integrated printing and molding method specifically includes: On the same continuous substrate, printing and contour die-cutting are performed simultaneously on the main area and the auxiliary area; wherein, during the contour die-cutting process, a local connection structure is retained at the edge of the auxiliary area, so that the auxiliary area is physically connected to the continuous substrate through the local connection structure. While maintaining the physical connection, the continuous substrate, the main body area, and the auxiliary area are bonded, cured, and shaped to obtain the paper product.

[0006] This invention simultaneously prints and die-cuts the main body and auxiliary areas on the same continuous substrate, and retains the local connection structure during die-cutting. In this way, the auxiliary areas maintain a physical connection with the substrate throughout the subsequent transfer and curing process, avoiding the secondary gripping and alignment bonding after the components are separated in the traditional process. This can effectively solve the bonding misalignment problem caused by secondary positioning deviation, and at the same time, it can significantly reduce the process flow time and improve production efficiency.

[0007] Specifically, the simultaneous execution of printing and contour die-cutting includes: detecting marking lines on the continuous substrate using a photoelectric sensor, and controlling the operating parameters of the printing equipment and the die-cutting equipment in a closed loop based on the position information of the marking lines, so as to achieve registration control between the main area and the auxiliary area.

[0008] Specifically, the local connection structure includes connecting bridges or micro-connection points; during the contour die-cutting process, the local connection structure is retained at the edge of the auxiliary area, so that the auxiliary area maintains a physical connection with the continuous substrate through the local connection structure; during the contour die-cutting process, the auxiliary area only completes contour die-cutting, and the auxiliary area is not completely separated from the main body area through the connecting bridges or the micro-connection points.

[0009] This invention sets the physical form as a connecting bridge or micro-connection point. By reserving an uncut area in the die-cutting path, the auxiliary area remains attached to the continuous substrate while completing the contour forming. This ensures the certainty of the component position in subsequent processes and avoids the risk of components scattering or shifting after complete cutting.

[0010] This application also provides a paper product comprising: a main body; an accessory portion having a partially connected structure that is not completely severed from the main body, the accessory portion maintaining a physical connection with the main body; and a synchronously printed graphic portion covering the main body and the accessory portion, wherein the registration error between the main body and the accessory portion is ≤0.1 mm.

[0011] The aforementioned paper products maintain the physical integrity of the main body and the auxiliary parts through a partially connected structure that is not completely cut off. No additional packaging is required to prevent the products from falling apart during the product manufacturing or circulation stages. Furthermore, the high registration accuracy of the synchronously printed graphics directly reflects the consistency of the manufacturing process, solving the common problems of graphics misalignment and low assembly efficiency in traditional split-manufacturing products.

[0012] Compared with the prior art, the present invention has the following advantages: 1. This application achieves simultaneous printing and contour die-cutting of the main and auxiliary areas on the same continuous substrate, while retaining local connection structures during the die-cutting process. This ensures that the auxiliary areas remain physically connected to the substrate. Subsequently, the substrate is bonded, cured, and shaped while maintaining this connection. Therefore, this invention constructs an integrated process link of "synchronous printing and cutting - local connection retention - curing with connection". This process link uses physical connection to replace the traditional mechanical gripping and secondary alignment, eliminating the positional uncertainty after component separation. This allows the image registration error to be controlled within 0.1 mm, while eliminating the need for independent bonding and assembly processes. The production efficiency is significantly improved compared to the traditional step-by-step process, and the surface scratches and waste products caused by multiple transfers are avoided.

[0013] 2. The present invention employs photoelectric sensors to detect marking lines and control the operating parameters of printing and die-cutting equipment in a closed loop. Combined with vibrating knife cutting technology and a connecting bridge design of a specific width, it achieves synergy between dynamic registration and precision forming. The closed-loop control mechanism compensates for tension fluctuations in continuous substrate transmission in real time, while the connecting bridge structure provides precise die-cutting boundaries while ensuring that the components do not separate. The combination of the two ensures high precision and high stability in multi-component synchronous processing scenarios, and significantly improves the finished product qualification rate.

[0014] 3. This application uses environmentally friendly materials such as recycled kraft paper, plant-based water-based ink, and starch-based adhesive throughout the entire process. Combined with low-temperature drying pretreatment and hot air circulation curing process, it achieves low energy consumption and zero VOC emissions in the production process while ensuring the physical properties and bonding firmness of the product. In particular, the low-temperature curing of starch-based adhesive in the connected state avoids thermal damage to the environmentally friendly paper material by high temperature, and makes full use of the positioning function of the connecting structure to ensure uniform stress on the bonding interface. This makes the product have excellent environmental protection properties, as well as good durability and appearance consistency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a flowchart of an integrated printing and molding method for environmentally friendly paper labels and stationery sets proposed in this invention; Figure 2 The graph shows the effect of printing speed on ink transfer rate and density. Figure 3 These are comparison images showing the micro-folding edge treatment. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] like Figure 1 As shown, this invention proposes an integrated printing and molding method for environmentally friendly paper labels and stationery sets, used to produce paper products. The paper products include a main area and auxiliary areas. The integrated printing and molding process includes the following steps: Step 1: On the same continuous substrate, simultaneously perform printing and contour die-cutting on the main body area and the auxiliary area; During the contour die-cutting process, a local connection structure is retained at the edge of the auxiliary area, so that the auxiliary area is physically connected to the continuous substrate through the local connection structure. Step 2: While maintaining the physical connection, the continuous substrate, the main body area, and the auxiliary area are bonded, cured, and shaped to obtain the paper product.

[0019] Specifically, the main area is the notebook cover area and the notepad area, and the auxiliary area is the environmentally friendly paper label. The notebook cover area, the notepad area and the environmentally friendly paper are composited with different paper bases to form a continuous paper roll. Recycled kraft paper is used to produce the main area, and biodegradable plant fiber paper is used to produce the auxiliary area, forming an integrated composite substrate suitable for simultaneous printing and die-cutting.

[0020] Specifically, in step 1, the synchronous execution of printing and contour die-cutting includes: detecting the marking lines on the continuous substrate using a photoelectric sensor, and controlling the operating parameters of the printing equipment and the die-cutting equipment in a closed loop based on the position information of the marking lines, so as to achieve registration control between the main area and the auxiliary area.

[0021] In one specific embodiment, the present invention uses a photoelectric sensor to capture the position of the marking line on the substrate in real time and feeds back the position deviation to the control system to dynamically adjust the operating phase of the printing and die-cutting equipment, forming a closed-loop registration control mechanism. This effectively compensates for the errors caused by tension fluctuations and mechanical transmission during the transmission of continuous substrates, ensuring that the graphics in the main area and the auxiliary area can be aligned with high precision.

[0022] Specifically, in step 1, the local connection structure includes a connecting bridge or a micro-connection point; during the contour die-cutting process, the local connection structure is retained at the edge of the auxiliary area, so that the auxiliary area is physically connected to the continuous substrate through the local connection structure. During the contour die-cutting process, the auxiliary area only completes the contour die-cutting, and the auxiliary area is not completely separated from the main body area through the connecting bridge or the micro-connection point.

[0023] This invention clarifies that the specific physical form of the local connection structure is a connecting bridge or micro-connection point. By reserving an uncut area in the die-cutting path, the auxiliary area is still attached to the continuous substrate while completing the contour forming. This ensures the certainty of the component position in subsequent processes and avoids the risk of components scattering or shifting after complete cutting, providing a structural basis for direct curing without bonding.

[0024] In one specific embodiment, the width of the connecting bridge is 0.6~1.0 mm; the contour die-cutting adopts vibrating knife cutting technology, the die-cutting pressure is set to 5-8 MPa, the die-cutting temperature is set to 25-30℃, and the die-cutting speed needs to be synchronized with the printing speed.

[0025] Specifically, in step 2, an adhesive is applied to the main area and / or the auxiliary area; the continuous substrate coated with the adhesive is cured by hot air circulation drying, so that the adhesive dries and sets while maintaining physical connection.

[0026] This invention utilizes the state where the component is still physically connected to the substrate for adhesive application and hot air curing, avoiding the complex operation of applying adhesive and pressing separately to the free component; the hot air circulation drying method can provide a uniform heat field distribution, allowing the adhesive to fully penetrate and cross-link in a static connection state, ensuring the stability and consistency of the curing process.

[0027] In one specific embodiment, the adhesive is a starch-based adhesive; the curing temperature of the hot air circulation drying method is set to 60-70℃, and the curing time is 10-15 min. After testing, the adhesion between the auxiliary area and the main area after curing is ≥5 N / 10 mm.

[0028] In one specific embodiment, in step 1, flexographic printing is performed using a flexible photosensitive resin plate, and the printing ink is selected from plant-based water-based ink or environmentally friendly soybean ink; the printing speed is 30-50 m / min, the printing temperature is 40-50℃, and the ink transfer rate is controlled above 90%.

[0029] Figure 2 The graph showing the effect of printing speed on ink transfer rate and density is presented. Figure 2 It can be seen that as the printing speed increases, the ink transfer rate and printing density generally show a downward trend; in particular, both the ink transfer rate curve and the printing density curve decrease with increasing speed. This indicates that excessively high printing speed will shorten the effective transfer time of ink between the printing plate and the substrate, which is not conducive to sufficient ink transfer and maintenance of printing density. Therefore, this embodiment controls the printing speed to keep it within a suitable working range that balances ink transfer rate and printing density, thereby helping to ensure the printing clarity, color consistency and batch production stability of the main area and / or auxiliary areas.

[0030] Specifically, after contour die-cutting and before bonding, curing and shaping, a forming process step may be included: folding and creasing the main body area, and micro-folding the auxiliary area, wherein the accuracy error of the forming process step is controlled within the range of less than or equal to ±0.2 mm.

[0031] Combination Figure 3It is known that ordinary folding treatment easily forms wide and irregular fold lines, and inconsistencies in folding may also occur in some areas. After the micro-folding treatment of this invention, the fold lines are narrower, straighter and more regular, and the folded area is more tightly bonded to the adjacent paper layers. As shown in the figure, the control accuracy of this invention can be controlled within the range of less than or equal to ±0.2 mm. It can be seen that the micro-folding treatment can improve the forming accuracy and appearance consistency of the folded part of the main area, and reduce local warping, misalignment and poor bonding caused by inconsistent fold line width or position deviation, thereby helping to improve the overall flatness and reliability of the product after integral molding.

[0032] This invention inserts a forming process after die-cutting and before curing, utilizing the positioning advantage of the component still being on a continuous substrate to perform edge folding and creasing, avoiding the cumulative errors caused by bonding after forming; micro-folding of the auxiliary area can release some of the internal stress of the paper in advance, preventing the label from lifting due to paper springback after curing, thereby further improving the appearance flatness and dimensional accuracy of the finished product.

[0033] In one specific embodiment, the continuous substrate is an integrated composite substrate formed by combining recycled kraft paper and biodegradable plant fiber paper. Before simultaneously performing printing and contour die-cutting, the continuous substrate needs to undergo low-temperature drying pretreatment. The temperature of the low-temperature drying pretreatment is 40-50℃, and the time is 30-40 min.

[0034] This application also provides a paper product comprising: a main body; an appendix having a partially connected structure with the main body that is not completely severed, the partially connected structure maintaining a physical connection between the appendix and the main body; and a synchronously printed graphic area covering the main body and the appendix, wherein the registration error between the main body and the appendix is ​​≤0.1 mm; specifically, the main body area is a notebook cover area and a memo paper area, and the appendix area is an environmentally friendly paper label; the notebook cover area, the memo paper area, and the environmentally friendly paper label are formed into a continuous paper roll by composite materials of different paper bases, wherein recycled kraft paper is used to produce the main body area, and biodegradable plant fiber paper is used to produce the appendix area, forming an integrated composite substrate suitable for synchronous printing and die-cutting.

[0035] It should be noted that the specific parameters of each step in this embodiment can be flexibly adjusted according to the product type. For example, for thin products such as memo pads, the substrate basis weight can be reduced to 80 g / m². 2 The die-cutting pressure is reduced to 5 MPa accordingly; for hard notebook covers, a double-layer composite structure can be adopted and the indentation depth can be increased; all modifications are within the protection scope of this invention.

[0036] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for integrated printing and molding of environmentally friendly paper labels and stationery sets, used to produce paper products, wherein the paper products include a main area and an auxiliary area, characterized in that, The integrated printing process includes the following steps: Step 1: On the same continuous substrate, simultaneously perform printing and contour die-cutting on the main body area and the auxiliary area; During the contour die-cutting process, a local connection structure is retained at the edge of the auxiliary area, so that the auxiliary area is physically connected to the continuous substrate through the local connection structure. Step 2: While maintaining the physical connection, the continuous substrate, the main body area, and the auxiliary area are bonded, cured, and shaped to obtain the paper product.

2. The integrated printing and molding method according to claim 1, characterized in that, In step 1, the simultaneous execution of printing and contour die-cutting includes: By detecting the marking lines on the continuous substrate using photoelectric sensors, and based on the position information of the marking lines, the operating parameters of the printing equipment and the die-cutting equipment are controlled in a closed loop to achieve registration control between the main area and the auxiliary area.

3. The integrated printing and molding method according to claim 1, characterized in that, In step 1, the local connection structure includes a connecting bridge or a micro-connection point; During the contour die-cutting process, a local connection structure is retained at the edge of the subordinate region, so that the subordinate region is physically connected to the continuous substrate through the local connection structure, including: During the contour die-cutting process, the auxiliary area only completes the contour die-cutting, and the auxiliary area is not completely separated from the main area by the connecting bridge or the micro-connecting point.

4. The integrated printing and molding method according to claim 3, characterized in that, The width of the connecting bridge is 0.6-1.0 mm; The contour die-cutting adopts vibrating knife cutting technology, with a die-cutting pressure of 5-8 MPa, a die-cutting temperature of 25-30℃, and the die-cutting speed is synchronized with the printing speed.

5. The integrated printing and molding method according to claim 1, characterized in that, Step 2 specifically includes: Apply adhesive to the main body area and / or the auxiliary area; The continuous substrate coated with the adhesive is cured by hot air circulation drying, so that the adhesive dries and sets while maintaining the physical connection.

6. The integrated printing and molding method according to claim 5, characterized in that, The adhesive is a starch-based adhesive; The curing temperature of the hot air circulation drying method is 60-70℃, the curing time is 10-15 min, and the adhesion between the auxiliary area and the main area after curing is ≥5 N / 10 mm.

7. The integrated printing and molding method according to claim 1, characterized in that, In step 1, the printing is performed using a flexible photosensitive resin plate for flexographic printing, and the printing ink is selected from plant-based water-based ink or environmentally friendly soybean ink. The printing speed is 30-50 m / min, the printing temperature is 40-50℃, and the ink transfer rate is controlled at over 90%.

8. The integrated printing and molding method according to claim 1, characterized in that, After the contour die-cutting and before the bonding, curing, and shaping, a forming process step is also included: The main body area is folded and indented, and the auxiliary area is micro-folded. The precision error of the forming process is controlled within the range of less than or equal to ±0.2 mm.

9. The integrated printing and molding method according to claim 1, characterized in that, In step 1, the continuous substrate is an integrated composite substrate formed by combining recycled kraft paper and biodegradable plant fiber paper; Before the simultaneous printing and contour die-cutting, the continuous substrate is subjected to a low-temperature drying pretreatment at a temperature of 40-50°C for 30-40 minutes.

10. A paper product, characterized in that, The paper product is manufactured using the integrated printing and molding method according to any one of claims 1-9, and the product comprises: Main body; An accessory portion, wherein the accessory portion and the main body portion have a partially connected structure that is not completely severed, the partially connected structure maintaining a physical connection between the accessory portion and the main body portion; A synchronously printed graphic section covers the main body and the auxiliary section, and the registration error between the main body and the auxiliary section is ≤0.1 mm.

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