Corrugated paper packaging box

Abstract

The utility model provides a corrugated paper packaging box, and belongs to the technical field of packaging paper structures. The corrugated paper packaging box comprises a box blank, the box blank comprises inner paper facing the inner surface of the packaging box, surface paper facing the outer surface of the packaging box and core paper arranged between the inner paper and the surface paper, and the core paper is made of composite curve type corrugated paper and comprises a corrugated structure. The corrugated structure extends on the surface of the core paper to form a composite curve consisting of a straight line section and an arc line section, the composite curve comprises a plurality of continuously arranged composite curve units, and each composite curve unit comprises a first arc line section arranged at a wave crest and a second arc line section arranged at a wave trough. And the straight line section is connected with the first arc line section and the second arc line section. According to the corrugated paper packaging box, the machining efficiency can be improved, the edge pressure strength and the deformation resistance are enhanced, and therefore the buffering protection performance of the corrugated paper packaging box is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to packing paper structure technical field, concretely relates to a corrugated paper packing box. BACKGROUND

[0002] In the production and manufacture of boutique packing gift box, usually adopt gray board as the box blank raw material, carry out die cutting to the box blank raw material through using die cutting machine, carry out V groove to the box blank raw material after die cutting through using V groove machine, the box blank raw material becomes box blank after these two processes, then put the box blank into box making machine to complete the foot forming, face paper, three processes of bubble removal, namely complete the manufacture of the boutique gift box.

[0003] The box blank material in the boutique gift box mostly selects gray board, rarely uses corrugated paper, mainly because the corrugation of traditional corrugated paperboard extends in straight line on the surface of corrugated paper, so the corrugated paper presents the shape of straight line parallel on the surface of corrugated paper, as shown in Figure 1 and Figure 2 . In the manufacturing process, the corrugated paperboard needs to be folded along the preset crease line, if the crease line is perpendicular to the extension direction of the core paper corrugation, the corrugated paperboard can be accurately folded along the preset crease line, if the crease line is parallel to the extension direction of the core paper corrugation, it will cause that the corrugated paperboard cannot be accurately folded along the preset crease line, because there is error in the actual manufacturing process, the crease line cannot be absolutely parallel to the extension direction of the core paper corrugation, as long as there is a small displacement, a certain degree of deviation will inevitably occur in the folding process, so that the "run pit" phenomenon occurs, which has a great influence on the forming of the packaging box with high dimensional accuracy.

[0004] In addition, when the extension direction of the corrugation is parallel to the V groove direction during the processing of the V groove, the V groove process is easy to tear the core paper of the corrugated paperboard from the surface paper or the inner paper of the corrugated paperboard in a large area, causing the phenomenon or failure of paper tearing, jamming and the like. In the process of manufacturing the boutique gift box, a same corrugated paper needs to be used for bidirectional V groove, the two directions of the bidirectional V groove are perpendicular to each other, therefore, if the corrugated paperboard with ordinary 0 degree or 90 degree corrugation is used for bidirectional V groove, the V groove direction will be parallel to the corrugation of the corrugated paperboard, causing the problem that this direction cannot be V grooved.

[0005] In order to solve this problem, one of the methods is to use diagonal corrugated paperboard to process V groove, but the diagonal corrugated paperboard cannot be directly produced in the production process of the corrugated paper, and can only be obtained through diagonal die cutting method to achieve the purpose of facilitating subsequent V groove, the straight line type corrugated paper 21 after V groove is shown in the (a) and (b) subgraphs of Figure 3 , and the diagonal corrugated paper 22 structure after V groove is shown in the (c) subgraph of Figure 3 . However, diagonal die cutting will cause great waste of materials, as shown inFigure 4 As shown, to get the same size of the box embryo, the material used by the 45-degree oblique die cutting ((b) subgraph) is more than 30% than the material used by the normal direction die cutting ((a) subgraph), thereby causing the raw material cost to further increase.

[0006] In addition, the existing straight line type corrugated paperboard also has the following defects:

[0007] 1. The corrugated paperboard has very high edge compression strength along the corrugated extension direction, but the edge compression strength perpendicular to the corrugated extension direction is very weak;

[0008] 2. The corrugated paperboard has relatively high deformation resistance along the corrugated extension direction, but is particularly prone to bending deformation perpendicular to the corrugated extension direction;

[0009] 3. When a local part of the corrugated paperboard surface is subjected to pressure, the local pressure part will collapse and extend along the corrugated extension direction, reducing the external appearance and packaging protection.

[0010] In the prior art, in order to improve the edge compression strength perpendicular to the corrugated extension direction, the structure of the traditional corrugated paperboard is optimized, such as the patent document with the patent name of S-shaped corrugated paper (CN205115918U) discloses a new type of corrugated paper. The improvement proposed is that the core paper structure extends in an S-shaped corrugation on the surface of the corrugated paper, rather than the straight line type extension of the traditional corrugated paper, and the S-shaped corrugations are evenly spaced and distributed throughout the corrugated paper. The S-shaped corrugation is formed by a plurality of continuous curved arcs, and the cross section of the side edge is also S-shaped. This technology improves the structure of the corrugated extension direction, which can make the corrugated paper surface have strength in both horizontal and vertical directions, and also increases the adhesion area, making the corrugated paperboard more solid, stress uniform and less prone to deformation. However, compared with the traditional straight line type corrugated paper, this structure can only improve the edge compression strength perpendicular to the core paper corrugated extension direction to a certain extent, but the edge compression strength of the corrugated paperboard along the corrugated extension direction will be greatly reduced. In addition, although the bearing capacity of a single curved arc is strong, in this technology, the curved arcs are staggered in opposite directions to form continuous curves. The stress dispersion capacity of such curves is poor, and the bearing capacity is weak. The result is that when subjected to pressure perpendicular to the corrugated extension direction, stress concentration occurs around the center of the curved arc, and the structure of the corrugated paperboard in this direction is still prone to collapse, the edge compression strength is improved limitedly, and it is difficult to meet the packaging requirements of products with high cushioning requirements. During transportation, it cannot protect the internal goods well when encountering bumps or collisions. Practical new type content

[0011] The corrugated paper packaging box can effectively solve the problem that the corrugated core layer is easily torn and damaged during V-groove cutting, and the problem that the V-groove process cannot be smoothly completed.

[0012] The corrugated paper packaging box comprises a box blank, the box blank comprises inner paper arranged towards the inner surface of the packaging box, surface paper arranged towards the outer surface of the packaging box, and core paper arranged between the inner paper and the surface paper, the core paper is made of composite curved corrugated paper, comprises a corrugated structure, the corrugated structure extends on the surface of the core paper, forms a composite curve composed of a straight line segment and an arc line segment, the composite curve comprises a plurality of continuously arranged composite curve units, the composite curve unit comprises a first arc line segment arranged at a wave crest, a second arc line segment arranged at a wave trough, and a straight line segment connecting the first arc line segment and the second arc line segment.

[0013] Further, the box blank is provided with a first inclined surface and a second inclined surface for splicing and forming, the first inclined surface and the second inclined surface form a splicing line on the inner side of the box blank, and the extension direction of the corrugated structure is parallel or perpendicular to the splicing line.

[0014] Further, the core paper is more than one layer, when the core paper is more than two layers, the core paper layers are arranged in layers, and isolation paper is arranged between adjacent core papers.

[0015] Further, the connection between the first arc line segment and the straight line segment and the connection between the second arc line segment and the straight line segment are continuously arranged in first derivative.

[0016] Further, the tangent line of the junction point of the first arc line segment and the straight line segment coincides with the straight line segment, and the tangent line of the junction point of the second arc line segment and the straight line segment coincides with the straight line segment.

[0017] Further, an included angle is formed between the straight line segment and the extension direction of the corrugated structure, and the range of the included angle is 20-45 degrees.

[0018] Further, the vertical distance L between the wave crest and the wave trough is 5-20 mm.

[0019] Further, the spacing between two adjacent wave crests or two adjacent wave troughs is 15-50 mm.

[0020] Further, the shapes of the composite curve units are the same, and the composite curve units are arranged repeatedly in a set rule in the extension direction of the corrugated structure.

[0021] Further, the first arc segment and the second arc segment are both circular arcs, and the radius of the circular arc is 3-15 mm.

[0022] Compared with the prior art, the utility model has the beneficial effects that:

[0023] 1. By using corrugated paperboard to replace gray board to make the packaging box, the weight of the packaging box can be reduced, the material cost can be reduced, the environmental protection performance can be improved, and the buffering protection performance can be enhanced.

[0024] 2. The improved corrugated paperboard is used in the box blank, so that the corrugated structure is not parallel or perpendicular to the V groove direction, the situation that the core paper is torn and jammed due to the parallel of the V groove direction and the corrugated lines is effectively avoided, the V groove passability and the processing efficiency are improved, and the "run pit" phenomenon caused by the folded corrugated paperboard is avoided.

[0025] 3. The packaging box does not need to be provided with diagonal corrugated paper, so that the utilization rate of the material is improved, the material waste rate is low compared with the diagonal corrugated paper, and the raw material cost is effectively reduced.

[0026] 4. The corrugated paper cannot form stress concentration under the action of external force, the edge pressure intensity perpendicular to the corrugated extension direction is greatly improved, the edge pressure intensity parallel to the corrugated extension direction is reduced to a smaller extent, so that the pain point that the traditional straight corrugated paper is extremely strong in one direction and extremely weak in another direction is improved, the corrugated paperboard of the utility model has bidirectional balanced edge pressure intensity along the corrugated extension direction and perpendicular to the core paper corrugated extension direction. Therefore, the strength of the packaging box of the utility model is higher, the buffering performance is better, and the internal articles can be well protected. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the scheme of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0028] Figure 1 And Figure 2 It is a structure schematic view of the traditional corrugated paperboard.

[0029] Figure 3 It is a structure schematic view of the straight line type corrugated paper 0 degree, 90 degree V groove straight corrugated paperboard and V groove diagonal corrugated paperboard.

[0030] Figure 4 It is a structure schematic view of normal direction die cutting and oblique die cutting.

[0031] Figure 5 This is a schematic diagram of the cross-sectional structure of the box blank of this utility model;

[0032] Figure 6 This is a schematic diagram of the composite curved corrugated paper structure of this utility model;

[0033] Figure 7 This is a schematic diagram of the structure of an embodiment of the composite curve unit of this utility model;

[0034] Figure 8 This is a schematic diagram of another embodiment of the composite curve unit of this utility model;

[0035] Figure 9 This is a schematic diagram of the composite curved corrugated paper structure for the V-groove of this utility model;

[0036] Figure 10 This is a schematic diagram of the V-groove structure of the box blank of this utility model;

[0037] Figure 11 for Figure 10 A magnified view of part A;

[0038] Figure 12 This is a schematic diagram of the box blank structure of the packaging box of this utility model.

[0039] Figure label:

[0040] 11. Straight-grained corrugated cardboard linerboard; 12. Straight-grained corrugated cardboard core paper; 13. Straight-grained corrugated cardboard face paper; 21. Straight-line corrugated paper to be V-grooved; 22. Slanted corrugated paper to be V-grooved; 23. Composite curved corrugated paper to be V-grooved; 30. Core paper; 31. Face paper; 32. Liner paper; 300. Corrugated structure; 301. Composite curve; 3011. First arc segment; 3012. Straight segment; 3013. Second arc segment; 400. Cross section; 41. Box blank; 42. Box foot; 43. Box bottom; 44. V-groove path; 45. V-groove; 451. First bevel; 452. Second bevel; 46. Splicing line. Detailed Implementation

[0041] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish different objects, not to describe a particular order.

[0042] The reference to "embodiments" in this specification means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment nor are they necessarily mutually exclusive or alternative embodiments. It is expressly understood that the application as described is merely an example of the application that can be embodied in various ways without departing from the application.

[0043] In order for those skilled in the art to better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings.

[0044] As shown in Figures 5-12 The corrugated paper packaging box of the present application comprises a box blank 41, the box blank 41 comprises inner paper 32 arranged towards the inner surface of the packaging box, face paper 31 arranged towards the outer surface of the packaging box, and core paper 30 arranged between the inner paper 32 and the face paper 31, the core paper 30 adopts a composite curved corrugated paper, comprising corrugated structure 300, the corrugated structure 300 extends on the surface of the core paper 30 to form a composite curve 301 composed of a straight line segment and an arc segment. The composite curve 301 comprises a plurality of continuously arranged composite curve units, the composite curve units comprise a first arc segment 3011 arranged at a wave crest, a second arc segment 3013 arranged at a wave trough, and a straight line segment 3012 connecting the first arc segment 3011 and the second arc segment 3013.

[0045] The core paper 30 of the present application adopts the composite curve design principle of "straight line segment + arc segment" on the surface, which is based on the synergistic effect of high-rigidity straight line segment and smooth arc transition, aiming to improve the bidirectional edge pressure strength of the corrugated paper. The rigidity of the straight line is the strongest, compared with the curve with an arc, the design of the straight line segment will effectively improve the bidirectional edge pressure strength of the corrugated paper. However, if the straight line is completely adopted without arc transition, the bidirectional edge pressure strength of the corrugated paper will only have strength without buffering, which will be quickly crushed under strong pressure, is not conducive to the protection of the internal product, and also completely lacks fatigue resistance, and the sharp corners formed at the corner fold lines are easy to cause the face paper 31 and the inner paper 32 matched with the corrugated paper to be broken, affecting the appearance effect, and the arc segment transition can significantly improve these problems.

[0046] The composite curve of the present application has the following advantages:

[0047] 1. Effectively improving the edge pressure strength: from the perspective of material mechanics, the sectional moment of inertia of the straight line segment is larger than that of the S-shaped arc, and the compression resistance is stronger, and the edge pressure strength of the straight line segment is higher than that of the arc with the same length, therefore, the present application can directly improve the bidirectional edge pressure strength of the corrugated paper;

[0048] 2. Effectively improves resistance to deformation: When the corrugated cardboard of this utility model is subjected to external impact, the stress can be transferred from the arc segment to the straight segments on both sides, effectively dispersing the stress and avoiding the stress concentration problem caused by the single arc of the S-shaped corrugation, thereby effectively improving the resistance to deformation.

[0049] 3. Enhanced feasibility and significantly improved production efficiency: This utility model is less prone to uneven deformation during corrugation. The arc transition section ensures a smooth transition at the connection of straight sections, enhancing processing feasibility and improving production efficiency. The processing difficulty of the "straight section + arc transition" composite curve unit groove roller is far lower than that of complex curvature sine curves, making processing more feasible.

[0050] Except for the different shape of the composite curve, the technical solutions and processing methods of this utility model are completely the same as those of traditional corrugated cardboard, and will not be repeated here. Figure 5 and Figure 6 As shown, the corrugated paper of this utility model also includes a cross section 400 or an end face perpendicular to the extension direction of the corrugated structure. The corrugated structure is arranged in a W-shaped or S-shaped wave pattern in the cross section 400 and the end face. Preferably, in this example, the S-shaped wave is a sine wave or a cosine wave, thereby avoiding the problem of stress concentration due to surface pressure.

[0051] like Figure 7 As shown, this utility model uses the horizontal midpoint of the composite curve on the corrugated paper surface as the x-axis and the direction perpendicular to the x-axis on the corrugated paper surface as the y-axis as an example to describe the composite curve of this utility model in detail.

[0052] This example illustrates one embodiment of a composite curve unit with a length of T. The composite curve unit comprises two straight line segments 3012 and a complete wave crest, which forms a first arc segment 3011. One of the two straight line segments 3012 is located to the left of the first arc segment 3011 and is a rising straight line; the other is located to the right of the first arc segment 3011 and is a falling straight line. These two straight line segments 3012 bear the main resistance to compressive loads.

[0053] The first arc segment 3011 smoothly connects the two straight segments 3012. In this example, within one period T, the second arc segment 3013 is divided into two segments in the middle, located at the ends of the two straight segments 3012 respectively. The first arc segment 3011 and the second arc segment 3013 in this example help to eliminate corner stress. When subjected to stress, they can quickly transfer the stress to the straight segments 3012 on both sides, effectively avoiding stress concentration.

[0054] The composite curve units of this invention have the same shape, and the composite curve units are repeatedly set according to a set rule in the extension direction of the corrugated structure.

[0055] As Figure 8 As shown in Figure 1, the corrugated structure 300 of the utility model comprises a plurality of composite curve units 3001, and the composite curve units 3001 are connected to each other in series.

[0056] Of course, the utility model can also be divided by the wave crest, and the like, and the point to be emphasized is that the utility model represents the same corrugated structure 300 regardless of how it is divided.

[0057] Preferably, the connection between the first arc segment and the straight line segment, and the connection between the second arc segment and the straight line segment are provided with first derivative continuity, so that the first arc segment 3011 and the straight line segment 3012, and the second arc segment 3013 and the straight line segment 3012 realize smooth transition at the connection points, and stress concentration is avoided.

[0058] Preferably, the tangent of the connection point of the first arc segment and the straight line segment coincides with the straight line segment, and the tangent of the connection point of the second arc segment and the straight line segment coincides with the straight line segment.

[0059] The straight line segment 3012 of the utility model forms an included angle a with the x-axis in the extension direction of the corrugated structure 300, and the included angle a is preferably 20-45 degrees, which effectively balances the rigidity and processing difficulty of the corrugated paper.

[0060] Preferably, the vertical distance L between the wave crest and the wave trough is 5-20 mm, and the spacing T between the adjacent two wave crests or the adjacent two wave troughs is preferably 15-50 mm, which meets the requirements of food buffering and packaging.

[0061] Preferably, the first arc segment 3011 and the second arc segment 3013 of the utility model are both circular arcs, and the radius of the circular arc is 3-15 mm, so that smooth transition with the straight line segment is better realized.

[0062] As a third embodiment of the utility model, the lengths of the composite curve units are different, the length T of the composite curve unit is relatively short in the area that needs to be strengthened, so that the composite curve units of the utility model are more dense, and the length T of the composite curve unit is relatively long in other areas, and the cost and rigidity are balanced.

[0063] As Figure 9As shown, the core paper adopts the composite curved corrugated paper of the utility model, without needing to cut the straight-line corrugated paper obliquely, but through normal cutting, that is, cutting along the direction parallel or perpendicular to the corrugation extension direction, the problems of tearing and jamming of the core paper caused by the straight-line corrugated paper V groove can be solved, and the material waste rate is low, and the raw material cost is effectively reduced.

[0064] As shown in the formula, the box blank 41 will cut V groove along the V groove path 44 before folding and forming the foot, and form V groove 45. Figure 10 And Figure 11 As shown in the formula, the box blank 41 will cut V groove along the V groove path 44 before folding and forming the foot, and form V groove 45.

[0065] As shown in the formula, the box blank 41 will cut V groove along the V groove path 44 before folding and forming the foot, and form V groove 45. Figures 10-12 As shown in the formula, the box blank 41 will cut V groove along the V groove path 44 before folding and forming the foot, and form V groove 45.

[0066] Preferably, for packaging boxes with high buffering effect requirements, in order to improve the buffering effect, the core paper 30 of the example can also be provided as two or more layers, when the core paper 30 is two or more layers, each layer of core paper is arranged in layers, and adjacent core papers 30 are separated by isolation paper.

[0067] As can be seen from the above, compared with the prior art, the utility model has the beneficial effects that:

[0068] 1. By using corrugated paperboard to replace gray board to make packaging boxes, the effects of reducing the weight of the packaging boxes, reducing material cost, improving environmental protection performance and enhancing buffering protection performance can be achieved.

[0069] 2. The box blank of the utility model adopts improved corrugated paperboard, so that the corrugated structure is not parallel or perpendicular to the V groove direction, effectively avoiding the tearing and jamming of the core paper caused by the parallel of the V groove direction and the corrugation pattern, improving the V groove passability and processing efficiency, especially for E pit corrugated paper with relatively thick thickness, stable mass production is achieved.

[0070] 3、 The packaging box does not need to be provided with twill corrugated paper, thereby improving the utilization rate of materials, and compared with twill corrugated paper, the material waste rate is low, and the raw material cost is effectively reduced.

[0071] 4、 The corrugated paper of the utility model will not form stress concentration under the action of external force, the edge pressure strength perpendicular to the corrugated extension direction is greatly improved, and the edge pressure strength parallel to the corrugated extension direction is reduced to a smaller extent, so that the pain point of the traditional straight corrugated paper, which is extremely strong in one direction and extremely weak in another direction, can be improved, the corrugated paperboard of the utility model has bidirectional balanced edge pressure strength along the corrugated extension direction and perpendicular to the core paper corrugated extension direction. Thus, the utility model has higher strength and better buffering performance, and can well protect the internal articles.

[0072] In summary, through the improvement of the core paper structure of the packaging box, the corrugated paper packaging box of the utility model not only has good structural strength and can reliably protect the internal articles, but also has excellent appearance flatness, forming effect and the like, and takes into account the material cost and production efficiency, is suitable for various packaging scenes of exquisite packaging gift boxes, and is an ideal choice to replace the traditional gift box gray board.

[0073] The above specific embodiments are preferred embodiments of the utility model, and are not intended to limit the specific implementation range of the utility model, the range of the utility model includes but is not limited to the specific embodiments, and equivalent changes made according to the utility model are within the protection range of the utility model.

Claims

1. A corrugated cardboard packaging box, characterized in that: The corrugated cardboard packaging box includes a box blank, which includes an inner liner facing the inner surface of the packaging box, a outer liner facing the outer surface of the packaging box, and a core liner disposed between the inner liner and the outer liner. The core liner is a composite curved corrugated cardboard, which includes a corrugated structure that extends on the surface of the core liner to form a composite curve composed of straight line segments and arc segments. The composite curve includes a plurality of continuously arranged composite curve units, each of which includes a first arc segment located at the crest of the wave, a second arc segment located at the trough of the wave, and a straight line segment connecting the first arc segment and the second arc segment.

2. The corrugated cardboard packaging box according to claim 1, characterized in that: The box blank is provided with a first inclined surface and a second inclined surface for splicing and forming. The first inclined surface and the second inclined surface form a splicing line on the inner side of the box blank. The extension direction of the corrugated structure is parallel or perpendicular to the splicing line.

3. The corrugated cardboard packaging box according to claim 1, characterized in that: The core paper has one or more layers. When the core paper has two or more layers, the core paper layers are stacked and separated by a separator paper.

4. The corrugated cardboard packaging box according to any one of claims 1-3, characterized in that: The connection points between the first arc segment and the straight line segment, and between the second arc segment and the straight line segment, are continuously set with first derivatives.

5. The corrugated cardboard packaging box according to claim 4, characterized in that: The tangent of the first arc segment at the point of connection with the straight line segment coincides with the straight line segment, and the tangent of the second arc segment at the point of connection with the straight line segment coincides with the straight line segment.

6. The corrugated cardboard packaging box according to any one of claims 1-3, characterized in that: The straight segment forms an angle with the extension direction of the corrugated structure, and the angle ranges from 20 to 45 degrees.

7. The corrugated cardboard packaging box according to any one of claims 1-3, characterized in that: The vertical distance L between the crest and trough is 5-20 mm.

8. The corrugated cardboard packaging box according to any one of claims 1-3, characterized in that: The distance between two adjacent peaks or two adjacent troughs is 15-50mm.

9. The corrugated cardboard packaging box according to any one of claims 1-3, characterized in that: Each composite curve unit has the same shape, and the composite curve units are repeatedly set according to a set rule in the extension direction of the corrugated structure.

10. The corrugated cardboard packaging box according to any one of claims 1-3, characterized in that: Both the first and second arc segments are circular arcs with a radius of 3-15mm.

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