Three-layer composite kraft paper board with high folding endurance

Abstract

The utility model discloses a three-layer composite kraft paper board with high folding endurance, which relates to the technical field of composite kraft paper boards and comprises an upper kraft paper layer, a composite layer and a lower kraft paper layer, the composite layer is positioned between the upper kraft paper layer and the lower kraft paper layer, the upper kraft paper layer is positioned above the composite layer, and the lower kraft paper layer is positioned above the composite layer. The upper kraft paper layer is located below the composite layer, the lower kraft paper layer is located below the composite layer, the upper kraft paper layer and the lower kraft paper layer are both made of regenerated fibers, reinforced fibers are added into the regenerated fibers, the composite layer comprises a PE woven cloth layer and nylon fiber layers, and the nylon fiber layers are located on the two sides of the PE woven cloth layer. According to the composite kraft paper board, the upper kraft paper layer and the lower kraft paper layer which are made of regenerated fibers and the composite layer comprising the PE woven cloth layer and the nylon fiber layer are combined, so that the folding endurance, the wear resistance, the puncture resistance and the overall strength of the composite kraft paper board can be improved, and the composite kraft paper board can maintain better flatness and integrity after being folded and unfolded for multiple times; and the service life of the composite kraft paper board is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of composite kraft paperboards, in particular to a three-layer composite kraft paperboard with high folding resistance. Background Art

[0002] Kraft paperboard, also known as linerboard or kraft cardboard, is a paperboard material with many excellent properties. Kraft paperboard is mainly made of wood pulp fiber and other materials. It goes through a series of complex process steps, such as impregnation, steaming, etc., to finally produce the finished product. Kraft paperboard is widely used in many fields due to its excellent properties, such as packaging industry, construction industry, etc. With the continuous growth of market demand and the continuous advancement of technology, kraft paperboard will show a broader prospect in future development.

[0003] During the use of kraft paperboard, since its performance does not meet the needs of various fields, other materials are added to it to form composite kraft paperboard. Composite kraft paperboard adopts a multi-layer composite structure. The common structure is a three-layer structure, including an upper kraft paper layer, a composite layer and a lower kraft paper layer, which plays a role of reinforcement and connection. This structure enables the composite kraft paperboard to further improve its physical properties while maintaining the original characteristics of kraft paper.

[0004] However, during the current use of composite kraft paperboard, since it needs to be combined with the specifications of different products, it needs to be aligned and folded before use. Moreover, since the composite paperboard can be reused, it needs to be aligned and folded repeatedly, which can easily cause the composite paperboard to break at its folded position, thereby affecting the service life of the composite kraft paperboard. Utility Model Content

[0005] Based on this, the purpose of the utility model is to provide a three-layer composite kraft paperboard with high folding resistance to solve the technical problem that during the use of the composite kraft paperboard, since it needs to be combined with the specifications of different products, it needs to be aligned and folded before use, and because the composite paperboard can be reused, it needs to be aligned and repeatedly folded, which easily causes the composite paperboard to break at its folding point, thereby affecting the service life of the composite kraft paperboard.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a three-layer composite kraft paperboard with high folding resistance, comprising an upper kraft paper layer, a composite layer and a lower kraft paper layer, wherein the composite layer is located between the upper kraft paper layer and the lower kraft paper layer, the upper kraft paper layer is located above the composite layer, and the lower kraft paper layer is located below the composite layer, the upper kraft paper layer and the lower kraft paper layer are both made of recycled fiber, and reinforcing fiber is added to the recycled fiber, the composite layer comprises a PE woven cloth layer and a nylon fiber layer, and the nylon fiber layer is located on both sides of the PE woven cloth layer.

[0007] By adopting the above technical solution and using recycled fibers to make the upper and lower kraft paper layers, the dependence on new wood resources can be reduced, thereby reducing the production cost of the kraft board. The addition of additional fibers to the recycled fibers can significantly improve the strength and folding resistance of the kraft board, thereby effectively resisting stress concentration during the folding process of the kraft board and preventing the board from breaking. At the same time, the PE woven cloth layer has good flexibility and tensile strength, which can prevent the kraft board from breaking at the crease, and the nylon fiber layer can protect the kraft board from external mechanical damage, thereby extending the service life of the kraft board. This structure can increase the folding resistance, wear resistance, puncture resistance and overall strength of the composite kraft board, so that it can maintain good flatness and integrity after multiple folding and unfolding, thereby extending the service life of the composite kraft board.

[0008] The utility model is further configured such that the PE woven cloth layer is woven from PE fibers that are crisscrossed.

[0009] By adopting the above technical solution, the PE fiber itself has high strength, and through the criss-cross weaving method, it can form a stable mesh structure, thereby increasing the tensile strength of the woven cloth layer, facilitating the increase of the durability of the kraft paperboard and extending the service life of the kraft paperboard.

[0010] The utility model is further configured such that the upper kraft paper layer, the composite layer and the lower kraft paper layer are bonded together by using a high-strength adhesive.

[0011] By adopting the above technical solution, the high-strength adhesive can firmly bond the upper kraft paper layer, the composite layer and the lower kraft paper layer together to form a whole, making it difficult to separate under the action of external force, thereby improving the overall strength and folding resistance of the kraft paperboard. Therefore, after multiple folding and unfolding, it can also maintain good flatness and integrity.

[0012] The utility model is further configured such that the surfaces of the upper kraft paper layer and the lower kraft paper layer are both provided with a functional coating, and the functional coating is configured as polyvinyl alcohol.

[0013] By adopting the above technical solution, the performance of polyvinyl alcohol can increase the adhesion and bonding force between fibers, thereby increasing the overall strength and folding resistance of kraft paperboard. At the same time, polyvinyl alcohol forms a sliding film on one side to reduce the friction between fibers, thereby extending the service life of the kraft paperboard.

[0014] The utility model is further configured such that a waterproof layer is provided on the surfaces of the upper kraft paper layer and the lower kraft paper layer, and the waterproof layer is made of a combination of a polyester film and a nylon film.

[0015] By adopting the above technical solution and using a combination of polyester film and nylon film, a solid waterproof barrier can be formed on the outer surface of the kraft paperboard, effectively preventing water penetration and facilitating extending the service life of the kraft paperboard.

[0016] In summary, the present invention has the following beneficial effects:

[0017] The utility model combines an upper kraft paper layer and a lower kraft paper layer made of recycled fiber with a composite layer including a PE woven cloth layer and a nylon fiber layer, thereby increasing the folding resistance, abrasion resistance, puncture resistance and overall strength of the composite kraft paperboard, so that the composite kraft paperboard can maintain good flatness and integrity after multiple folding and unfolding, thereby extending the service life of the composite kraft paperboard. At the same time, the design of the composite layer fully considers the performance and cost-effectiveness of the material, so that the kraft paperboard has excellent performance while maintaining a high cost-effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0019] Figure 2 This is a detailed diagram of the internal structure of the present invention.

[0020] In the figure: 1. Upper kraft paper layer; 2. Composite layer; 201. PE woven cloth layer; 202. Nylon fiber layer; 3. Lower kraft paper layer; 4. Waterproof layer; 5. Functional coating. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0022] The following describes an embodiment of the present invention based on its overall structure.

[0023] A high folding resistance three-layer composite kraft paperboard, such as Figure 1-2 As shown, it includes an upper kraft paper layer 1, a composite layer 2 and a lower kraft paper layer 3, the composite layer 2 is located between the upper kraft paper layer 1 and the lower kraft paper layer 3, the upper kraft paper layer 1 is located above the composite layer 2, and the lower kraft paper layer 3 is located below the composite layer 2, then the upper kraft paper layer 1, the composite layer 2 and the lower kraft paper layer 3 can be combined to form a kraft paper board, and at the same time, the upper kraft paper layer 1, the composite layer 2 and the lower kraft paper layer 3 are bonded with a high-strength adhesive, and the upper kraft paper layer 1, the composite layer 2 and the lower kraft paper layer 3 can be firmly bonded together to form a whole, so that it is not easy to separate under the action of external force, thereby improving the overall strength and folding resistance of the kraft paper board.

[0024] Then, the upper kraft paper layer 1 and the lower kraft paper layer 3 are both made of recycled fibers, which can reduce the dependence of the upper kraft paper layer 1 and the lower kraft paper layer 3 on new wood resources, and can also reduce the production cost of the kraft paper board, which is convenient for improving market competitiveness. Reinforcing fibers are added to the recycled fibers, which significantly improves the strength and folding resistance of the kraft paper board, thereby effectively resisting stress concentration during the folding process of the kraft paper board and preventing the paper board from breaking. At the same time, the composite layer 2 includes a PE woven cloth layer 201 and a nylon fiber layer 202, and the nylon fiber layer 202 is located on both sides of the PE woven cloth layer 201. The nylon fiber layer 202 can protect the kraft paper board and prevent it from being damaged by external mechanical damage, thereby extending the service life of the kraft paper board. The PE woven cloth layer 201 is woven from PE fibers that are crisscrossed. Through the criss-cross weaving method, a stable mesh structure can be formed, thereby increasing the tensile strength of the PE woven cloth layer 201 and increasing the durability of the kraft paper board.

[0025] Furthermore, a functional coating 5 is provided on the surface of the upper kraft paper layer 1 and the lower kraft paper layer 3, and the functional coating 5 is set to polyvinyl alcohol. The performance of polyvinyl alcohol can increase the adhesion and binding force between fibers, thereby increasing the overall strength and folding resistance of the kraft paper board. At the same time, a waterproof layer 4 is provided on the surface of the upper kraft paper layer 1 and the lower kraft paper layer 3. The waterproof layer 4 is made of a combination of polyester film and nylon film, so a solid waterproof barrier is formed on the outer surface of the kraft paper board, which effectively blocks water penetration and facilitates extending the service life of the kraft paper board.

[0026] In this embodiment, by combining the upper kraft paper layer 1 and the lower kraft paper layer 3 made of recycled fibers and the composite layer 2 comprising the PE woven cloth layer 201 and the nylon fiber layer 202, the folding resistance, wear resistance, puncture resistance and overall strength of the composite kraft paperboard can be increased, so that it can maintain good flatness and integrity after multiple folding and unfolding, thereby extending the service life of the composite kraft paperboard.

[0027] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not limitations on the present invention. The specific features, structures, materials, or characteristics described may be combined in a suitable manner in any 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 purpose of the present invention, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A three-layer composite kraft paperboard with high folding resistance, comprising an upper kraft paper layer (1), a composite layer (2) and a lower kraft paper layer (3), wherein the composite layer (2) is located between the upper kraft paper layer (1) and the lower kraft paper layer (3), the upper kraft paper layer (1) is located above the composite layer (2), and the lower kraft paper layer (3) is located below the composite layer (2), characterized in that: The upper kraft paper layer (1) and the lower kraft paper layer (3) are both made of recycled fibers, and reinforcing fibers are added to the recycled fibers. The composite layer (2) includes a PE woven cloth layer (201) and a nylon fiber layer (202), and the nylon fiber layer (202) is located on both sides of the PE woven cloth layer (201).

2. The high folding endurance three-layer composite kraft paperboard according to claim 1, characterized in that: The PE woven cloth layer (201) is woven from PE fibers that are crisscrossed.

3. The high folding endurance three-layer composite kraft paperboard according to claim 1, characterized in that: The upper kraft paper layer (1), the composite layer (2) and the lower kraft paper layer (3) are bonded together using a high-strength adhesive.

4. The high folding endurance three-layer composite kraft paperboard according to claim 1, characterized in that: The surfaces of the upper kraft paper layer (1) and the lower kraft paper layer (3) are both provided with a functional coating (5), and the functional coating (5) is configured as polyvinyl alcohol.

5. The high folding endurance three-layer composite kraft paperboard according to claim 1, characterized in that: The surfaces of the upper kraft paper layer (1) and the lower kraft paper layer (3) are provided with a waterproof layer (4), and the waterproof layer (4) is made of a combination of polyester film and nylon film.

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