A top and bottom cover carton capable of preventing corner cracking

Abstract

The present application relates to a kind of top and bottom cover carton of preventing corner cracking, comprising: ground cover and top cover;The top cover is movably buckled on the ground cover;By setting first anti-cracking line on the first bending part in ground cover and second anti-cracking line on the second bending part in top cover, the cracking problem that can effectively prevent top and bottom cover carton eight corners from being easily produced is cracked.

Description

Technical Field

[0001] This invention relates to the field of cardboard box technology, and more specifically, to a top and bottom lid cardboard box that prevents corner cracking. Background Technology

[0002] Top-and-bottom cartons are a widely used type of rigid packaging box in the packaging industry. They are favored by the electronics packaging industry due to their significant advantages, including lower production costs, automated production lines, and customizable designs. Especially in recent years, their rapid development and the huge market demand for top-and-bottom cartons across many supply chains indicate a bright future for this type of packaging.

[0003] The client requires the reuse of cardboard boxes while ensuring product transport quality, which places higher demands on the quality of the boxes. Existing top and bottom cardboard boxes are produced by machine assembly lines, which has the advantages of convenient manufacturing and high production efficiency, but their top and bottom corners are prone to cracking, making it difficult to meet the requirements for reuse. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a top and bottom lid carton that prevents corner cracking.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0006] A cardboard box with a top and bottom lid to prevent corner cracking includes: a bottom lid and a top lid; the top lid is movably fastened to the bottom lid; characterized in that the bottom lid includes: a bottom plate; first side plates are bent at both ends of the bottom plate, and second side plates are bent at both sides of the bottom plate; first bends are bent at both ends of the second side plates; the first side plates at one end of the bottom plate are fixedly connected to two first bends at one end of the bottom plate; the first side plates at the other end of the bottom plate are fixedly connected to two first bends at the other end of the bottom plate; an opening is made at the top corner of the first bends near the bottom plate. A first anti-crack line is provided to prevent the bottom corner of the ground cover from cracking; the roof cover includes: a top plate; third side plates are bent at both ends of the top plate, and fourth side plates are bent at both sides of the top plate; second bends are bent at both ends of the fourth side plates; the third side plate at one end of the top plate is fixedly connected to two second bends at one end of the top plate; the third side plate at the other end of the top plate is fixedly connected to two second bends at the other end of the top plate; a second anti-crack line is provided at the top corner of the second bends near the top plate to prevent the top corner of the roof cover from cracking.

[0007] Optionally, the first anti-crack line is formed by connecting the first arc and the first tangent end to end.

[0008] Optionally, when the thickness of the first bent portion is 1~2mm, the radius of the first arc is 1.0±0.2mm; when the thickness of the first bent portion is 2~3mm, the radius of the first arc is 1.5±0.2mm; when the thickness of the first bent portion is 3~5mm, the radius of the first arc is 2.0±0.2mm.

[0009] Optionally, the second anti-crack line is formed by connecting the first and last ends of a second arc and a second tangent.

[0010] Optionally, when the thickness of the second bend is 1~2mm, the radius of the second arc is 1.0±0.2mm; when the thickness of the second bend is 2~3mm, the radius of the second arc is 1.5±0.2mm; when the thickness of the second bend is 3~5mm, the radius of the second arc is 2.0±0.2mm.

[0011] Optionally, a first reinforcing plate is bent at the top of the first side plate, and the first reinforcing plate is fixedly connected to the two first bent portions respectively; a second reinforcing plate is bent at the top of the second side plate.

[0012] Optionally, a third reinforcing plate is bent at the top of the third side plate, and the third reinforcing plate is fixedly connected to the two second bending portions respectively; a fourth reinforcing plate is bent at the top of the fourth side plate.

[0013] In summary, the present invention has the following beneficial effects: (1) The corners of the top and bottom lid cardboard box are less prone to cracking. (2) The structure of the anti-crack line composed of arcs and tangents effectively releases the tensile force at the corner bend when the bending part is bent at 90°, preventing cracking after multiple bends. (3) The radius of the arc of the anti-crack line varies for cardboard boxes of different thicknesses, and this application provides an optimized selection criterion. (4) The setting of the reinforcing plate enhances the cardboard box's resistance to deformation, reduces the amount of deformation, and further reduces the problem of corner cracking caused by deformation and tension. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the ground cover in this invention;

[0015] Figure 2 This is a schematic diagram of the structure of the canopy in this invention;

[0016] Figure 3 This is an unfolded view of the floor cover in this invention;

[0017] Figure 4 This is an unfolded view of the canopy in this invention;

[0018] Figure 5 yes Figure 3 Enlarged view of region A in the middle;

[0019] Figure 6 yes Figure 4 Enlarged schematic diagram of region B in the middle.

[0020] In the diagram: 1. Ground cover; 11. Base plate; 12. First side plate; 121. First reinforcing plate; 13. Second side plate; 131. Second reinforcing plate; 14. First bend; 141. First anti-crack line; 1411. First arc; 1412. First tangent; 2. Sky cover; 21. Top plate; 22. Third side plate; 221. Third reinforcing plate; 23. Fourth side plate; 231. Fourth reinforcing plate; 24. Second bend; 241. Second anti-crack line; 2411. Second arc; 2412. Second tangent. Detailed Implementation

[0021] To make the objectives, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0023] In this invention, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of a second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. The terms "vertical," "horizontal," "left," "right," "above," "below," and similar expressions are for illustrative purposes only and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] This invention provides a top and bottom lid cardboard box to prevent corner cracking, such as... Figures 1-4 The diagram shows: a ground cover 1 and a roof cover 2; the roof cover 2 is movably fastened to the ground cover 1; characterized in that the ground cover 1 includes: a base plate 11; first side plates 12 are bent at both ends of the base plate 11, and second side plates 13 are bent at both sides of the base plate 11; first bending portions 14 are bent at both ends of the second side plates 13; the first side plates 12 located at one end of the base plate 11 are fixedly connected to the two first bending portions 14 located at one end of the base plate 11; the first side plates 12 located at the other end of the base plate 11 are fixedly connected to the two first bending portions 14 located at the other end of the base plate 11; a protective feature is provided on the first bending portion 14 near the top corner of the base plate 11 to prevent the ground cover 1 from being bent. The top cover 2 includes a top plate 21; third side plates 22 are bent at both ends of the top plate 21, and fourth side plates 23 are bent at both sides of the top plate 21; second bending portions 24 are bent at both ends of the fourth side plates 23; the third side plates 22 located at one end of the top plate 21 are fixedly connected to the two second bending portions 24 located at one end of the top plate 21; the third side plates 22 located at the other end of the top plate 21 are fixedly connected to the two second bending portions 24 located at the other end of the top plate 21; a second anti-crack line 241 is provided on the second bending portion 24 near the top corner of the top plate 21 to prevent the top corner of the top cover 2 from cracking.

[0026] In this embodiment, the materials of the bottom cover 1 and the top cover 2 can be corrugated cardboard or K paper. Both have similar structures, but the inner dimensions of the top cover 2 are slightly larger than the outer dimensions of the bottom cover 1, allowing the top cover 2 to be fastened to the top of the bottom cover 1, achieving the advantages of easy access and no need for sealing with adhesive tape. The first side panels 12 located at the left and right ends of the bottom plate 11 are bent upwards at 90 degrees, and the second side panels 13 located at the front and rear ends of the bottom plate 11 are bent upwards at 90 degrees, thus forming a square frame that, when combined with the bottom plate 11, forms a cuboid with an open structure. The first bent portions 14 located at the left and right ends of the second side panels 13 are bent 90 degrees towards the other second side panel 13, so that the outer walls of the two first bent portions 14 located at the left end of the bottom plate 11 are attached to the inner wall of the first side panel 12 located at the left end of the bottom plate 11 by adhesive, double-sided tape, or staples. Specifically, at the corners of the first bent portions 14 (such as...) Figure 3 As shown, a first anti-crack line 141 is punched on the corner near the bottom plate 1, dividing the corner of the first bent portion 14 into two separate parts. The first anti-crack line 141 reduces the tensile force on the corner of the first bent portion 14 and the second side plate 13 after the first bent portion 14 is bent at 90° and fixed to the first side plate 12, thereby making the corner (the corner of the bottom of the floor cover 1) formed by the bottom plate 11, the first side plate 12, and the second side plate 13 less prone to cracking. The third side plate 22 located at the left and right ends of the top plate 21 is bent upward at 90 degrees, and the fourth side plate 23 located at the front and rear ends of the top plate 21 is bent upward at 90 degrees, thereby forming a square frame, which, together with the top plate 21, forms a cuboid with an open structure. The second bends 24 at the left and right ends of the fourth side panel 23 are each bent 90° toward the other fourth side panel 23, so that the outer walls of the two second bends 24 at the left end of the top panel 21 are attached to the inner wall of the third side panel 22 at the left end of the top panel 21 by means of adhesive, double-sided tape, or staples. The corners of the second bends 24 (such as...) Figure 4 As shown, a second anti-crack line 241 is punched on the corner near the top plate 2. The second anti-crack line 241 divides the corner of the second bend 24 into two separate parts. The second anti-crack line 241 reduces the tensile force on the corner of the second bend 24 and the fourth side plate 23 after the second bend 24 is bent at 90° and fixed to the third side plate 22, thereby making the corner (the corner of the top of the roof 2) formed by the top plate 21, the third side plate 22 and the fourth side plate 23 less prone to cracking.

[0027] Furthermore, the first anti-crack line 141 is formed by connecting the first arc 1411 and the first tangent 1412 end to end.

[0028] like Figure 5As shown, the first anti-crack line 141 is hook-shaped, formed by connecting the first arc 1411 and the first tangent 1412 end to end. The first arc 1411 can effectively prevent the corners (see...) from cracking after the first bend 14 is bent. Figure 5 The problem of cracking occurred at point C due to excessive tensile force.

[0029] Furthermore, through research on cardboard boxes with different thicknesses, the applicant found that when the thickness of the first bend 14 is 1~2mm (i.e., the thickness of the cardboard box is 1~2mm), the radius of the first arc 1411 is 1.0±0.2mm, which is most effective in preventing the corners of the bottom cover 1 from cracking; when the thickness of the first bend 14 is 2~3mm, the radius of the first arc 1411 should be 1.5±0.2mm; when the thickness of the first bend 14 is 3~5mm, the radius of the first arc 1411 should be 2.0±0.2mm.

[0030] Furthermore, the second anti-crack line 241 is formed by connecting the second arc 2411 and the second tangent 2412 end to end.

[0031] like Figure 6 As shown, the second anti-crack line 241 is hook-shaped, formed by connecting the second arc 2411 and the second tangent 2412 end to end. The second arc 2411 can effectively prevent the corners (see...) from cracking after the second bend 24 is bent. Figure 6 The crack at point D in the image is caused by excessive tensile force.

[0032] Furthermore, through research on cardboard boxes with different thicknesses, the applicant found that when the thickness of the second bend 24 is 1~2mm (i.e., the thickness of the cardboard box is 1~2mm), the radius of the second arc 2411 is 1.0±0.2mm, which is most effective in preventing the corners of the top cover 2 from cracking; when the thickness of the second bend 24 is 2~3mm, the radius of the second arc 2411 should be 1.5±0.2mm; when the thickness of the second bend 24 is 3~5mm, the radius of the second arc 2411 should be 2.0±0.2mm.

[0033] Furthermore, a first reinforcing plate 121 is bent at the top of the first side plate 12, and the first reinforcing plate 121 is fixedly connected to the two first bending portions 14 respectively; a second reinforcing plate 131 is bent at the top of the second side plate 13.

[0034] like Figure 1 and Figure 3As shown, a first reinforcing plate 121 is bent inward from the top of the first side plate 12. An adhesive layer is applied to the first reinforcing plate 121, allowing it to be firmly attached to the inner walls of the two first bends 14. Similarly, a second reinforcing plate 131 is bent inward from the top of the second side plate 13. An adhesive layer is also applied to the second reinforcing plate 13, allowing it to be firmly attached to the inner wall of the second side plate 13. This design increases the thickness of the paper layer at the top of the floor cover 1, enhancing its resistance to deformation and reducing the amount of deformation of the floor cover 1. This further reduces the problem of corner cracking caused by deformation and stretching of the floor cover 1.

[0035] Furthermore, a third reinforcing plate 221 is bent at the top of the third side plate 22, and the third reinforcing plate 221 is fixedly connected to the two second bending portions 24 respectively; a fourth reinforcing plate 231 is bent at the top of the fourth side plate 23.

[0036] like Figure 2 and Figure 4 As shown, a third reinforcing plate 221 is bent inward from the top of the third side plate 22. An adhesive layer is applied to the third reinforcing plate 221, allowing it to be firmly attached to the inner walls of the two second bends 24. Similarly, a fourth reinforcing plate 231 is bent inward from the top of the fourth side plate 23. An adhesive layer is also applied to the fourth reinforcing plate 23, allowing it to be firmly attached to the inner wall of the fourth side plate 23. This design increases the thickness of the paper layer at the bottom of the cover 2, enhancing its resistance to deformation and reducing the amount of deformation of the cover 2, thereby further reducing the problem of corner cracking caused by deformation and stretching of the cover 2.

[0037] In summary, the corner-prevention carton of the present invention has at least the following advantages: (1) The corners of the carton are not prone to cracking. (2) The structure of the anti-crack line composed of arc and tangent makes the tensile force at the corner bend effectively released when the bending part is bent at 90°, and it does not crack after multiple bends. (3) For cartons of different thicknesses, the radius of the arc of the anti-crack line is different, and this application provides an optimized selection criterion. (4) The setting of the reinforcing plate enhances the deformation resistance of the carton and reduces the amount of deformation of the carton, thereby further reducing the corner cracking problem caused by deformation and tension of the carton.

[0038] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A top-and-bottom lid cardboard box to prevent corner cracking, comprising: Earth cover and sky cover; The canopy is movably fastened to the ground cover; characterized in that the ground cover includes: a base plate; first side plates bent at both ends of the base plate, and second side plates bent at both sides of the base plate; first bent portions bent at both ends of the second side plates; the first side plates located at one end of the base plate are respectively fixedly connected to two first bent portions located at one end of the base plate; the first side plates located at the other end of the base plate are respectively fixedly connected to two first bent portions located at the other end of the base plate; a protective opening is provided at the top corner of the first bent portion near the base plate to prevent the bottom of the ground cover from... A first anti-crack line for corner cracking; the roof includes: a top plate; third side plates bent at both ends of the top plate, and fourth side plates bent at both sides of the top plate; second bends bent at both ends of the fourth side plates; the third side plate at one end of the top plate is fixedly connected to two second bends at one end of the top plate; the third side plate at the other end of the top plate is fixedly connected to two second bends at the other end of the top plate; a second anti-crack line is provided at the top corner of the second bends near the top plate to prevent corner cracking of the top of the roof; The first anti-crack line is formed by connecting the first arc and the first tangent end to end; when the thickness of the first bend is 1-2 mm, the radius of the first arc is 1.0 ± 0.2 mm; when the thickness of the first bend is 2-3 mm, the radius of the first arc is 1.5 ± 0.2 mm; when the thickness of the first bend is 3-5 mm, the radius of the first arc is 2.0 ± 0.2 mm. The second anti-crack line is formed by connecting the first and last ends of the second arc and the second tangent; when the thickness of the second bend is 1 to 2 mm, the radius of the second arc is 1.0 ± 0.2 mm; when the thickness of the second bend is 2 to 3 mm, the radius of the second arc is 1.5 ± 0.2 mm; when the thickness of the second bend is 3 to 5 mm, the radius of the second arc is 2.0 ± 0.2 mm.

2. A top-and-bottom lid cardboard box for preventing corner cracking according to claim 1, characterized in that, A first reinforcing plate is bent at the top of the first side plate, and the first reinforcing plate is fixedly connected to the two first bent portions respectively; a second reinforcing plate is bent at the top of the second side plate.

3. A top-and-bottom lid cardboard box for preventing corner cracking according to claim 1, characterized in that, A third reinforcing plate is bent at the top of the third side plate, and the third reinforcing plate is fixedly connected to the two second bending parts respectively; a fourth reinforcing plate is bent at the top of the fourth side plate.

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