Multi-layer composite digital printing paperboard

Abstract

The utility model discloses a multilayer composite digital printing paperboard, which relates to the field of paperboard structures and comprises a surface layer, a core layer and a bottom layer, and a composite water-resistant system formed by combining zirconium carbonate amine and alkenyl succinic anhydride is adopted in pulp of the surface layer, the core layer and the bottom layer. According to the multilayer composite digital printing paperboard, a composite water-resistant system formed by combining zirconium carbonate amine and alkenyl succinic anhydride is specially added into the paper pulp of the surface layer, the core layer and the bottom layer of the multilayer composite digital printing paperboard, so that the zirconium carbonate amine and the alkenyl succinic anhydride are uniformly distributed in the paper pulp of each layer, the composite water-resistant system plays a key role, and the overall water-resistant performance of the paperboard is remarkably improved. Even in a humid environment, the paper board is not prone to absorbing water, the problems of deformation, strength reduction and the like can be avoided, and therefore the paper board can be well matched with a water vapor contact packaging scene, and the using effect is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of paperboard structure, specifically a multi-layer composite digital printing paperboard. Background Technology

[0002] In today's booming packaging and printing industry, the performance requirements for various packaging materials and printing media are becoming increasingly diverse and sophisticated. With frequent global trade and the ever-expanding scope of commodity circulation, packaging materials must not only meet the basic function of protecting goods but also adapt to different environmental conditions, such as moisture resistance, dampness protection, and pressure resistance. Simultaneously, in printing, a smooth and flat cardboard surface is required to ensure the exquisiteness and clarity of printed patterns, thereby enhancing the product's display effect and added value, and meeting consumers' demands for high-quality product packaging and promotional materials.

[0003] Currently, there are many types of digital printing paperboard on the market, but they still have many shortcomings in performance. Some ordinary paperboards have poor water resistance and are prone to softening and reduced strength when exposed to high humidity or small amounts of moisture. Moreover, many paperboards are not structurally sound, with insufficient bonding between layers, leading to delamination during transportation, processing, or use, affecting overall stability and durability. In addition, the surface smoothness and texture of the paperboard vary, making it difficult to meet the special requirements of some high-end packaging and printing applications.

[0004] Traditional digital printing paperboard is typically manufactured by first preparing pulp for the surface layer, core layer, and bottom layer separately. The surface layer pulp usually uses common fiber raw materials, while the core and bottom layers use appropriate fibers based on cost and basic performance requirements. Each layer of pulp is then formed separately, and conventional reinforcing agents or additives may be added during the forming process to improve basic properties. After forming, the layers are combined using a simple lamination process, and finally dried to produce the finished digital printing paperboard. In this process, improvements to properties such as water resistance are often achieved only through single additives or simple coating treatments, lacking systematic optimization.

[0005] Due to the lack of an effective composite water-resistant system, existing digital printing paperboards lack durability in humid environments, easily absorbing water and damaging the contents of the packaging or affecting the printing effect. Regarding interlayer bonding, traditional lamination processes struggle to ensure strong connections between layers, making the paperboard prone to delamination under external impact or repeated bending, reducing product reliability. Furthermore, traditional paperboards are not refined enough in fiber selection and processing, failing to simultaneously meet requirements for strength, flexibility, and texture. For example, in the production of high-end packaging, they cannot provide sufficient stiffness and a good aesthetic texture, limiting their application in the high-end market. Utility Model Content

[0006] Therefore, the purpose of this utility model is to provide a multi-layer composite digital printing paperboard to solve the technical problem.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a multi-layer composite digital printing paperboard, comprising a surface layer, a core layer, and a bottom layer, wherein the surface layer, core layer, and bottom layer pulp employ a composite water-resistant system composed of zirconium carbonate amine and alkenyl succinic anhydride.

[0008] By adopting the above technical solutions, the overall water resistance of the cardboard is improved, ensuring that the cardboard is not easily deformed.

[0009] The present invention is further provided that an adhesive is applied between the surface layer, the core layer and the bottom layer.

[0010] By adopting the above technical solutions, the connection between each layer is strengthened, making the multi-layer structure more stable.

[0011] The present invention is further configured such that a waterproof layer is coated on the surface layer, and the waterproof layer is a composite water-resistant system composed of starch, carboxymethyl cellulose (CMC), styrene-acrylate copolymer and zirconium carbonate amine.

[0012] By adopting the above technical solutions, waterproofing can be effectively achieved.

[0013] The present invention is further configured such that the surface layer is obtained by using a grading sieve processing technology to obtain long fibers.

[0014] By adopting the above technical solutions, the outer surface of the cardboard is guaranteed to be smooth and textured.

[0015] The present invention is further configured such that the core layer is made of short fibers obtained by graded sieving technology.

[0016] By adopting the above technical solutions, the overall strength of the cardboard is guaranteed.

[0017] The present invention is further configured such that the bottom layer is a composite of long and short fibers.

[0018] By adopting the above technical solutions, the strength of the cardboard can be further improved.

[0019] The present invention is further configured such that a small amount of cotton and linen fibers are added to the surface layer, the core layer and the bottom layer.

[0020] By adopting the above technical solutions, the structural strength of the cardboard is guaranteed while making it less prone to deformation.

[0021] In summary, the present invention has the following main advantages:

[0022] 1. This utility model utilizes a composite water-resistant system, composed of zirconium carbonate amine and alkenyl succinic anhydride, which is intentionally added to the surface layer, core layer, and bottom layer of the multi-layer composite digitally printed paperboard. This system is evenly distributed throughout the pulp layers, playing a crucial role in significantly improving the overall water resistance of the paperboard. Even in humid environments, the paperboard does not easily absorb water, preventing deformation and strength loss, thus making it well-suited for packaging scenarios involving moisture and ensuring optimal performance.

[0023] 2. This utility model first carefully applies an adhesive between the surface layer, core layer, and bottom layer to enhance the interlayer connection; then, a waterproof layer containing starch, carboxymethyl cellulose (CMC), and other components is applied to the surface layer. At the same time, different fibers are carefully selected for each layer, and cotton and linen fibers are added. The adhesive makes each layer tightly connected, and the waterproof layer strengthens the surface waterproofing. The combination of different fibers and the addition of cotton and linen fibers take into account strength, flexibility, and texture, greatly increasing the durability and practicality of the cardboard and meeting the needs of many different application scenarios. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0026] In the diagram: 1. Surface layer; 2. Core layer; 3. Bottom layer; 4. Adhesive; 5. Waterproof layer. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0028] The embodiments of this utility model will be described below based on its overall structure.

[0029] A multi-layer composite digital printing paperboard, such as Figure 1-2 As shown, it includes a surface layer 1, a core layer 2, and a bottom layer 3. The surface layer 1, core layer 2, and bottom layer 3 use a composite water-resistant system composed of zirconium carbonate amine and alkenyl succinic anhydride, thereby improving the overall water resistance of the paperboard. This makes the paperboard less prone to deformation and strength reduction due to water absorption when facing humid environments, thus expanding its application scenarios. For example, it can better maintain its performance in packaging applications that may come into contact with moisture.

[0030] Furthermore, an adhesive 4 is applied between the surface layer 1, the core layer 2, and the bottom layer 3, which helps to enhance the tightness of the connection between the layers, making the multi-layer structure more stable and avoiding delamination during use. This ensures the overall structural strength and stability of the cardboard, improves its durability, and maintains good integrity during transportation, subsequent processing, and use.

[0031] The surface layer 1 is coated with a waterproof layer 5, which is a composite water-resistant system composed of starch, carboxymethyl cellulose (CMC), styrene-acrylate copolymer, and zirconium carbonate amine. This further enhances the water resistance of the cardboard surface and can more effectively prevent water from penetrating into the cardboard when it comes into contact with external moisture, thus providing better protection for the cardboard. This is especially beneficial for applications that need to be in direct contact with the external environment and have high waterproof requirements, such as outdoor advertising display boards, as it can extend their service life and ensure that the printed content is not affected by water.

[0032] The surface layer 1 uses long fibers obtained through a grading and sieving process. These long fibers give the surface layer good strength and toughness, making the surface smoother and more even. The core layer 2 uses short fibers obtained through the grading and sieving process. These short fibers make the core layer structure relatively denser, ensuring a certain strength while also giving the entire cardboard good flexibility and helping to reduce the overall weight of the cardboard. This is more advantageous in applications where weight is a requirement (such as packaging that is easy to handle). Meanwhile, the bottom layer 3 is a blend of long and short fibers, which combines the advantages of both. It provides good support strength to ensure the overall stability of the cardboard, while also giving the bottom layer a certain degree of flexibility to adapt to different placement and usage conditions, thus improving the overall practicality of the cardboard.

[0033] Furthermore, a small amount of cotton and linen fibers are added to the surface layer 1, core layer 2, and bottom layer 3 to enhance the overall strength of the cardboard and make it less prone to deformation during use. This further highlights its quality for applications that require a better appearance and texture, such as the production of high-end packaging boxes.

[0034] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A multi-layer composite digital printing paperboard, comprising a surface layer (1), a core layer (2), and a bottom layer (3), characterized in that: The surface layer (1), core layer (2) and bottom layer (3) are composed of a composite water-resistant system made of zirconium carbonate amine and alkenyl succinic anhydride.

2. The multi-layer composite digital printing paperboard according to claim 1, characterized in that: An adhesive (4) is applied between the surface layer (1), the core layer (2), and the bottom layer (3).

3. The multi-layer composite digital printing paperboard according to claim 2, characterized in that: A waterproof layer (5) is coated on the surface layer (1).

4. The multi-layer composite digital printing paperboard according to claim 1, characterized in that: The surface layer (1) is made of long fibers obtained by graded sieve processing technology.

5. The multi-layer composite digital printing paperboard according to claim 1, characterized in that: The core layer (2) is short fibers obtained by graded sieve processing technology.

6. The multi-layer composite digital printing paperboard according to claim 1, characterized in that: The bottom layer (3) is a blend of long and short fibers.

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