A multi-layer pressure-resistant high-density double gray cardboard

Abstract

This utility model discloses a multi-layer pressure-resistant high-density double-gray cardboard, relating to the field of packaging materials technology. It includes an outer protective layer, a middle support layer, and an inner substrate layer. The middle support layer comprises an outer kraft paper layer, an outer bamboo fiber layer, an inner bamboo fiber layer, and an inner kraft paper layer. A fire-resistant layer is provided on the opposite surfaces of the outer and inner bamboo fiber layers. A compression-resistant component is symmetrically arranged between the fire-resistant layer and the outer and inner bamboo fiber layers. The upper and lower sides of the compression-resistant component are coated with an upper adhesive layer and a lower adhesive layer, respectively. Honeycomb holes are uniformly arranged on the compression-resistant component. This solution, by setting a compression-resistant component within the middle support layer and providing multiple honeycomb holes inside the component, allows the adhesive to enter the honeycomb holes before solidification after coating its upper and lower surfaces. After solidification, the adhesive provides auxiliary support to the honeycomb holes, making the paper less prone to bending and deformation under pressure. Furthermore, the fire-resistant layer improves the overall fire resistance of the cardboard.

Description

Technical Field

[0001] This utility model relates to the field of packaging materials technology, specifically to a multi-layer pressure-resistant high-density double-gray cardboard. Background Technology

[0002] Double-sided grey cardboard is a common packaging material widely used in many fields. However, existing double-sided grey cardboard may not meet the pressure resistance requirements of some scenarios with high strength requirements, such as packaging heavy goods or multi-layer stacked packaging.

[0003] Traditional double-gray cardboard is mainly made of multiple layers of kraft paper or recycled paper pressed at high temperature, and has the following technical defects:

[0004] 1. Insufficient compressive strength, prone to deformation under long-term load;

[0005] 2. It lacks fire resistance, has poor bending performance, and has a relatively limited function.

[0006] To address the above, we propose a multi-layer, pressure-resistant, high-density double-gray cardboard. Utility Model Content

[0007] The purpose of this utility model is to provide a multi-layer pressure-resistant high-density double-gray cardboard to solve the problems of existing double-gray cardboard mentioned in the background art: 1. insufficient compressive strength, which easily deforms under long-term load; 2. lack of fire resistance, poor bending performance, and relatively simple function.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a multi-layer pressure-resistant high-density double-gray cardboard, comprising an outer protective layer, a middle support layer, and an inner substrate layer. The outer protective layer, the middle support layer, and the inner substrate layer are connected by high-temperature pressing. The middle support layer comprises an outer kraft paper layer, an outer bamboo fiber layer, an inner bamboo fiber layer, and an inner kraft paper layer. The outer kraft paper layer, the outer bamboo fiber layer, the inner bamboo fiber layer, and the inner kraft paper layer are sequentially formed by high-temperature pressing from the outside to the inside. A fireproof layer is provided on the opposite surfaces of the outer bamboo fiber layer and the inner bamboo fiber layer. A pressure-resistant component is symmetrically arranged between the fireproof layer and the outer bamboo fiber layer and the inner bamboo fiber layer. The upper and lower sides of the pressure-resistant component are coated with an upper layer of adhesive and a lower layer of adhesive, respectively. Honeycomb holes are uniformly arranged on the pressure-resistant component. The pressure-resistant components are symmetrically arranged on the upper and lower sides of the fireproof layer.

[0009] Preferably, the outer protective layer has reinforcing ribs on its surface.

[0010] Preferably, the inner substrate layers are impregnated with phenolic resin.

[0011] Preferably, the adhesives in the upper and lower layers fill the interior of the honeycomb pores.

[0012] Preferably, the thickness ratio of the outer protective layer, the intermediate support layer, and the inner substrate layer is 1:10:3.

[0013] Preferably, the pressure-resistant component is a bamboo-based engineered wood panel.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This multi-layer, pressure-resistant, high-density double-gray cardboard employs an outer protective layer, a middle support layer, and an inner substrate layer of a specific thickness ratio. A certain thickness of middle support layer is placed between the outer protective layer and the inner substrate layer, and a compression-resistant component is installed within this middle support layer. This compression-resistant component has multiple honeycomb holes inside. After applying an upper and lower layer of adhesive to its top and bottom surfaces, the adhesive enters the honeycomb holes before solidification. After solidification, it provides auxiliary support to the honeycomb holes, further improving the compression resistance of the component. When the paper is subjected to external impact, the evenly distributed honeycomb holes, filled with solidified adhesive, can disperse the force, resulting in better compression resistance of the component and thus further enhancing the compression resistance of the double-gray cardboard.

[0016] 2. This type of multi-layer pressure-resistant high-density double-gray cardboard improves the overall fire resistance of the cardboard by setting a fireproof layer made of flame-retardant composite laminate between the symmetrically arranged pressure-resistant components. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of the present invention;

[0018] Figure 2 A schematic diagram showing the upper and lower layers of adhesive coating applied to the pressure-resistant component of this utility model;

[0019] Figure 3 This is a partial cross-sectional schematic diagram of the pressure-resistant component of this utility model.

[0020] In the diagram: 1. Outer protective layer; 2. Outer kraft paper layer; 3. Outer bamboo fiber layer; 4. Compression-resistant component; 41. Upper adhesive layer; 42. Lower adhesive layer; 43. Honeycomb holes; 5. Inner bamboo fiber layer; 6. Inner kraft paper layer; 7. Inner substrate layer; 8. Fireproof layer. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example: Please refer to Figure 1-3 This utility model provides a technical solution: a multi-layer pressure-resistant high-density double-gray cardboard, comprising an outer protective layer 1, a middle support layer, and an inner substrate layer 7. The outer protective layer 1, the middle support layer, and the inner substrate layer 7 are connected by high-temperature pressing. The thickness ratio of the outer protective layer 1, the middle support layer, and the inner substrate layer 7 is 1:10:3. Specifically, the thickness of the outer protective layer 1 is between 0.3-0.5 mm, the thickness of the middle support layer is between 3-5 mm, and the thickness of the inner substrate layer 7 is between 1-2 mm.

[0023] Furthermore, the surface of the outer protective layer 1 is coated with a waterproof coating and embossed with reinforcing ribs. The purpose of adding reinforcing ribs to the exterior of the outer protective layer 1 is primarily to alter the physical structure of the paper, increasing its rigidity and load-bearing capacity. Like beams and columns in a building, the reinforcing ribs disperse and absorb external forces, reducing deformation and damage to the paper under stress. When the paper is subjected to pressure, tension, or bending forces, the reinforcing ribs can evenly distribute these forces across the entire paper surface, thereby improving the overall strength of the paper.

[0024] Furthermore, the inner substrate layer 7 is impregnated with phenolic resin. The phenolic resin impregnation treatment of the inner substrate layer 7 results in good machinability. Phenolic resin impregnation makes the double grey cardboard easier to cut, drill, and perform other processing operations, allowing the substrate to better adapt to various processing requirements during production.

[0025] For further details, please refer to Figure 1 The intermediate support layer includes an outer kraft paper layer 2, an outer bamboo fiber layer 3, an inner bamboo fiber layer 5, and an inner kraft paper layer 6. Both the outer kraft paper layer 2 and the inner kraft paper layer 6 are made of high-density kraft paper.

[0026] Furthermore, the outer kraft paper layer 2, outer bamboo fiber layer 3, inner bamboo fiber layer 5, and inner kraft paper layer 6 are sequentially formed by high-temperature pressing from the outside in. A fire-resistant layer 8 is provided on the opposite surfaces of the outer bamboo fiber layer 3 and inner bamboo fiber layer 5. The fire-resistant layer 8 is made of a flame-retardant composite laminate, which is a composite material composed of a reinforcing layer, a paperboard layer, and a fire-retardant adhesive layer. By adding a fire-retardant adhesive layer between the paperboard layers, the overall fire resistance of the paperboard is improved.

[0027] In this example, such as Figure 2As shown, pressure-resistant components 4 are symmetrically arranged between the fireproof layer 8, the outer bamboo fiber layer 3, and the inner bamboo fiber layer 5. The upper and lower sides of the pressure-resistant components 4 are coated with an upper adhesive 41 and a lower adhesive 42, respectively. Both the upper adhesive 41 and the lower adhesive 42 are water-based acrylic elastic sealant. This water-based acrylic elastic sealant is elastic and can withstand a stretch of approximately ±10%, making it suitable for bonding elastic cardboard seams. The pressure-resistant components 4 have uniformly distributed honeycomb holes 43, and are symmetrically arranged on the upper and lower sides of the fireproof layer 8.

[0028] Furthermore, the compression-resistant component 4 is made of bamboo-based engineered wood. Bamboo-based engineered wood is made using a special process that utilizes the rapid growth and high strength of bamboo. This makes the board not only environmentally friendly and sustainable but also possesses excellent compression resistance, making it suitable for indoor and outdoor flooring, wall panels, and other building materials. Its compression resistance is affected by the characteristics of the raw material bamboo itself and the processing technology. Optimizing hot-pressing parameters and other processes can effectively reduce internal voids and defects in the board, increase its density, and enhance its compression strength. Because it has multiple honeycomb holes 43 inside, after applying the upper and lower layers of adhesive to its top and bottom surfaces, the adhesive enters the honeycomb holes 43 before solidification. After solidification, it provides some auxiliary support to the honeycomb holes 43, further improving the compression resistance of the compression-resistant component 4. When the paper is subjected to external impact, the evenly distributed honeycomb holes 43, filled with solidified adhesive, can disperse the force, making the compression-resistant component 4 even more effective, thus further improving the compression resistance of the double-gray cardboard.

[0029] Working Principle: This multi-layer, pressure-resistant, high-density double-gray cardboard features an intermediate support layer of a certain thickness between the outer protective layer 1 and the inner substrate layer 7. Within this intermediate support layer is a compression-resistant component 4, which contains multiple honeycomb holes 43. After applying upper and lower layers of adhesive to its top and bottom surfaces, the adhesive enters the honeycomb holes 43 before solidification. After solidification, the adhesive provides auxiliary support to the honeycomb holes 43, further enhancing the compression resistance of the compression-resistant component 4. When the paper is subjected to external impact, the evenly distributed honeycomb holes 43, filled with solidified adhesive, disperse the force, further improving the compression resistance of the compression-resistant component 4 and thus enhancing the compression resistance of the double-gray cardboard.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-layer pressure-resistant high-density double-gray cardboard, comprising an outer protective layer (1), an intermediate support layer, and an inner substrate layer (7), characterized in that: The outer protective layer (1), the intermediate support layer and the inner substrate layer (7) are connected by high temperature pressing. The intermediate support layer includes an outer kraft paper layer (2), an outer bamboo fiber layer (3), an inner bamboo fiber layer (5) and an inner kraft paper layer (6). The outer kraft paper layer (2), the outer bamboo fiber layer (3), the inner bamboo fiber layer (5) and the inner kraft paper layer (6) are formed by high temperature pressing from the outside to the inside. A fireproof layer (8) is provided on the opposite side of the outer bamboo fiber layer (3) and the inner bamboo fiber layer (5). A pressure-resistant component (4) is symmetrically arranged between the fireproof layer (8) and the outer bamboo fiber layer (3) and the inner bamboo fiber layer (5). The upper and lower sides of the pressure-resistant component (4) are coated with an upper layer of adhesive (41) and a lower layer of adhesive (42) respectively. A honeycomb hole (43) is uniformly arranged on the pressure-resistant component (4). The pressure-resistant component (4) is symmetrically arranged on the upper and lower sides of the fireproof layer (8).

2. A multi-layer pressure-resistant high-density double-kraft paperboard according to claim 1, characterized in that: The outer protective layer (1) has reinforcing ribs on its surface.

3. The multi-layer pressure-resistant high-density double-kraft paperboard according to claim 1, characterized in that: The inner substrate layer (7) is impregnated with phenolic resin.

4. The multi-layer pressure-resistant high-density double-kraft paperboard according to claim 1, wherein: The adhesives of the upper coating (41) and the lower coating (42) fill the inside of the honeycomb pores (43).

5. The multi-layer pressure-resistant high-density double-kraft paperboard according to claim 1, wherein: The thickness ratio of the outer protective layer (1), the intermediate support layer and the inner substrate layer (7) is 1:10:

3.

6. The multi-layer pressure-resistant high-density double-kraft paperboard according to claim 1, wherein: The pressure-resistant component (4) is a bamboo-made artificial board.

Images