Corrugated board structure with force-bearing bands

Abstract

The utility model discloses a corrugated paperboard structure with stress belt, including from top to bottom composite printing surface paper layer, tensile grid layer, corrugated core layer and moistureproof bottom layer, the tensile grid layer is constituted by the fiber grid of warp and weft weaving, and its lower surface is distributed with hot melt glue point, the corrugated core layer's corrugated peak top is bonded with the grid node of tensile grid layer through hot melt glue point, the bottom surface of corrugated core layer is compounded with the stress paper strip belt of longitudinal parallel arrangement, and the moistureproof bottom layer is bonded with the corrugated valley bottom of corrugated core layer and stress paper strip belt through adhesive. The dot matrix type connecting structure in the utility model makes the load directly transmit to the corrugated peak top through the grid node, effectively restrains the tensile deformation of printing surface paper layer, when the corrugated core layer is pressed, and stress is efficiently transmitted to stress paper strip belt through the corrugated valley bottom, makes local pressure -bearing intensity improve.

Description

Technical Field

[0001] This utility model relates to the field of corrugated paper processing technology, specifically to a corrugated cardboard structure with a stress-bearing band. Background Technology

[0002] In current corrugated cardboard technology, conventional multi-layer composite structures generally rely on thickening the core layer or increasing the amount of adhesive to improve strength, leading to increased material costs and environmental limitations. Especially when the cardboard is subjected to vertical pressure, the printed paper layer is prone to tensile deformation, affecting the integrity of the surface printing; at the same time, the pressure is concentrated at the peak of the corrugated core layer, lacking an effective stress dispersion path, resulting in a significant risk of local collapse. Utility Model Content

[0003] The purpose of this invention is to provide a corrugated cardboard structure with a stress-bearing strip. The dot matrix connection structure allows the load to be directly transferred to the top of the corrugations through the grid nodes, effectively suppressing the tensile deformation of the printed paper layer. When the corrugated core layer is compressed, the stress is efficiently transferred to the stress-bearing paper strip through the bottom of the corrugations, thereby improving the local compressive strength and solving the problems in the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A corrugated cardboard structure with a stress-bearing band includes, from top to bottom, a printed face paper layer, a tensile grid layer, a corrugated core layer, and a moisture-proof bottom layer; the tensile grid layer is composed of a warp and weft woven fiber grid, and hot melt adhesive dots are distributed on its lower surface; the corrugated peaks of the corrugated core layer are bonded to the grid nodes of the tensile grid layer through hot melt adhesive dots; the bottom surface of the corrugated core layer is laminated with longitudinally parallel stress-bearing paper strips, and the moisture-proof bottom layer is bonded to the corrugated valleys of the corrugated core layer and the stress-bearing paper strips through adhesive.

[0005] Preferably, the width of the stressed paper strip is 15-25mm and the spacing is 30-60mm.

[0006] Preferably, the diameter of the hot melt adhesive dots is 0.8-1.2 mm, and they are coated on the lower surface of the tensile mesh layer in a dot matrix pattern.

[0007] Preferably, the mesh edge size of the tensile mesh layer is 10-20mm.

[0008] Preferably, the corrugation height of the corrugated core layer is 4.7-5.3 mm.

[0009] Preferably, the length direction of the stressed paper strip is consistent with the corrugated arrangement of the corrugated core layer.

[0010] Preferably, the grid nodes are located directly above the corrugation peaks and are bonded together with hot melt adhesive dots.

[0011] Preferably, the moisture-proof bottom layer is bonded to the corrugated valley bottom using epoxy-modified starch adhesive.

[0012] Preferably, the density of the stressed paper strips in the four edge regions of the corrugated cardboard is twice that in the central region.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. In this utility model, the tensile mesh layer is woven from biodegradable polylactic acid fibers into a warp and weft mesh. The mesh nodes are precisely bonded to the corrugated peaks of the corrugated core layer through hot melt adhesive dots with a diameter of 0.8-1.2mm. This dot matrix connection structure allows the load to be directly transferred to the corrugated peaks through the mesh nodes, effectively suppressing the tensile deformation of the printed paper layer, while reducing the amount of adhesive used by 10%-15%, thus balancing structural stability and environmental protection.

[0014] 2. This invention incorporates longitudinally parallel stress-bearing paper strips laminated to the bottom surface of a corrugated core layer. These strips are made of high-grammage bamboo pulp paper, with a width of 15-25mm and a spacing of 30-60mm. The length direction of the strips aligns with the corrugation direction, forming a continuous main stress-bearing channel. When the corrugated core layer is under pressure, the stress is efficiently transferred to the stress-bearing paper strips through the corrugation valleys, increasing the local compressive strength by 23%. Furthermore, the optimized strip spacing design improves material utilization. Attached Figure Description

[0015] Figure 1 This is a bottom view of the overall structure of this utility model after disassembly. Figure 2 This is an isometric view of the connection between the tensile mesh layer and the corrugated core layer of this utility model; Figure 3 This is a top plan view of the tensile mesh layer and corrugated core layer of this utility model; Figure 4 This is a bottom view of the corrugated core layer and the stressed paper strip of this utility model.

[0016] In the diagram: 1. Printed face paper layer; 2. Tensile mesh layer; 3. Corrugated core layer; 4. Moisture-proof bottom layer; 5. Stress-bearing paper strip; 6. Hot melt adhesive dots; 7. Corrugated peaks; 8. Mesh nodes; 9. Corrugated valleys. Detailed Implementation

[0017] 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.

[0018] To address the issue of relying on thickened core layers or full-coat adhesives to improve strength in existing technologies, the following technical solution is proposed. Please refer to [link / reference]. Figure 1-4 ; A corrugated cardboard structure with a stress-bearing band, comprising four functional layers from top to bottom: a printed face paper layer 1, a tensile mesh layer 2, a corrugated core layer 3, and a moisture-proof bottom layer 4. The printed face paper layer 1 has a basis weight greater than or equal to 200 g / m². 2 Kraft paper with a modified starch adhesive coated on its underside.

[0019] The tensile mesh layer 2 is directly attached to the underside of the printed paper layer 1. It is made of biodegradable polylactic acid fibers woven into a warp and weft mesh. The mesh lines intersect with the corrugated peaks 7 of the corrugated core layer 3. The edge size of the mesh openings is 10-20mm, and the basis weight ranges from 40 to 60g / m². 2 The lower surface of the grid is coated with hot melt adhesive dots 6 with a diameter of 0.8-1.2mm in a dot matrix pattern.

[0020] The corrugated core layer 3 is located below the tensile mesh layer 2. It is made of standard corrugated core paper rolled into a uniform corrugated structure with a corrugation height of 4.7-5.3mm. The grid nodes 8 of the tensile mesh layer 2 are aligned with the corrugation peaks 7. The corrugation peaks 7 and the grid nodes 8 are bonded together by hot melt adhesive dots 6, thereby connecting the tensile mesh layer 2 and the corrugated core layer 3.

[0021] The bottom of the corrugated core layer 3 is laminated with a stress-bearing paper strip 5, which is made of high-grammage bamboo pulp paper strips arranged in parallel longitudinal directions. The stress-bearing paper strip 5 has a width of 15-25mm, a spacing of 30-60mm, and a grammage of 280-340g / m². 2 The length direction of the stressed paper strip 5 is consistent with the direction of the corrugated arrangement; the upper surface of the stressed paper strip 5 is coated with polyurethane adhesive and is completely adhered to the bottom surface of the corrugated core layer 3.

[0022] Moisture-proof bottom layer 4 uses 180g / m 2 The coated kraft paper is bonded to the corrugated core layer 3 and the corrugated valley bottom 9 of the stress-bearing paper strip 5 by epoxy-modified starch adhesive.

[0023] The production process includes: first, the stressed paper strip 5 is bonded to the bottom of the corrugated core layer 3 substrate with an accuracy of ±1 mm, and then cured by hot roller pressure at 170-190 degrees Celsius; the pre-treated corrugated core layer 3 is rolled into periodic gradient corrugations by corrugated rollers to form corrugated peaks 7 and corrugated valleys 9; the tensile mesh layer 2 is hot-pressed onto the printed face paper layer 1; hot melt adhesive dots 6 are sprayed at the mesh nodes 8, and the composite of tensile mesh layer 2 and printed face paper layer 1 is pressed downwards to align and bond the hot melt adhesive dots 6 with the corrugated peaks 7; finally, the corrugated valleys 9 are coated with adhesive and connected to the moisture-proof bottom layer 4; the arrangement density of the stressed paper strip 5 in the four edge areas of the cardboard is doubled.

[0024] When the cardboard is under pressure, the load of the corrugated core layer 3 is directly transferred to the stressed paper strip 5, forming an efficient load-bearing path, while the tensile mesh layer 2 inhibits the tensile deformation of the printed paper layer 1.

[0025] Working principle: When an external load is applied to the printed paper layer 1, the pressure is first transmitted downwards to the tensile mesh layer 2 below it. This mesh layer is woven from biodegradable polylactic acid fibers, and its warp and weft mesh structure effectively disperses and suppresses the tensile deformation of the printed paper layer 1. The mesh nodes 8 are precisely bonded to the corrugated peaks 7 of the corrugated core layer 3 through pre-applied hot melt adhesive dots 6, forming a dot-matrix connection to ensure efficient load transmission to the corrugated structure.

[0026] When the corrugated core layer 3 is subjected to pressure, its corrugated structure deforms. At this time, the load is directly transferred through the corrugated valleys to the load-bearing paper strips 5 that are closely attached to its bottom. These longitudinally parallel high-grammage bamboo pulp paper strips are laid along the corrugation direction to form a continuous load-bearing main channel. The load-bearing paper strips 5 bear the main compressive stress due to their high density characteristics, while their specific width and spacing optimize the load distribution efficiency.

[0027] The corrugated valleys 9 at the bottom of the corrugated core layer 3 are firmly bonded to the moisture-proof bottom layer 4 with adhesive. This bottom layer is made of coated kraft paper, which provides moisture protection while working in conjunction with the stress-bearing paper strips 5 to enhance the overall compressive strength. The density of the stress-bearing paper strips 5 in the edge area of ​​the cardboard is doubled, significantly improving the edge's resistance to collapse.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] 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.

Claims

1. A corrugated cardboard structure with a stress-bearing band, characterized in that, The material comprises, from top to bottom, a printed paper layer (1), a tensile mesh layer (2), a corrugated core layer (3), and a moisture-proof bottom layer (4); the tensile mesh layer (2) is composed of a woven fiber mesh, and hot melt adhesive dots (6) are distributed on its lower surface; the corrugated peaks (7) of the corrugated core layer (3) are bonded to the mesh nodes (8) of the tensile mesh layer (2) through the hot melt adhesive dots (6); the bottom surface of the corrugated core layer (3) is composited with longitudinally parallel stress-bearing paper strips (5), and the moisture-proof bottom layer (4) is bonded to the corrugated valleys (9) of the corrugated core layer (3) and the stress-bearing paper strips (5) through adhesive.

2. The corrugated cardboard structure with a stress-bearing band according to claim 1, characterized in that, The width of the stressed paper strip (5) is 15-25mm and the spacing is 30-60mm.

3. A corrugated cardboard structure with a stress-bearing band according to claim 2, characterized in that, The hot melt adhesive dots (6) have a diameter of 0.8-1.2 mm and are coated on the lower surface of the tensile mesh layer (2) in a dot matrix pattern.

4. A corrugated cardboard structure with a stress-bearing band according to claim 3, characterized in that, The mesh edge size of the tensile mesh layer (2) is 10-20mm.

5. A corrugated cardboard structure with a stress-bearing band according to claim 4, characterized in that, The corrugated core layer (3) has a corrugation height of 4.7-5.3 mm.

6. A corrugated cardboard structure with a stress-bearing band according to claim 5, characterized in that, The length direction of the stressed paper strip (5) is consistent with the corrugated arrangement of the corrugated core layer (3).

7. A corrugated cardboard structure with a stress-bearing band according to claim 6, characterized in that, The grid node (8) is located directly above the corrugated peak (7) and is bonded by hot melt adhesive dots (6).

8. A corrugated cardboard structure with a stress-bearing band according to claim 7, characterized in that, The moisture-proof bottom layer (4) is bonded to the corrugated valley bottom (9) by epoxy-modified starch adhesive.

9. A corrugated cardboard structure with a stress-bearing band according to claim 8, characterized in that, The density of the stressed paper strips (5) in the four edge areas of the corrugated cardboard is twice that in the central area.

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