A multi-ply corrugated paperboard

Abstract

The application discloses a kind of multilayer corrugated paper, it is related to the field of corrugated paper, it includes face paper layer, first corrugated paper layer, intermediate paper layer, second corrugated paper layer and bottom paper layer, the first corrugated paper layer and second corrugated paper layer are all wavy, a plurality of first wave crest and first wave trough are formed on the first corrugated paper layer, a plurality of second wave crest and second wave trough are formed on the second corrugated paper layer;The first wave crest and second wave trough correspond and are longitudinally distributed, the first wave trough and second wave crest correspond and are longitudinally distributed, support cylinder is arranged in the first wave trough, and the support cylinder supports face paper layer.The application helps to improve the structural strength of multilayer corrugated paper.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of corrugated paperboard, in particular to a multi-layer corrugated paperboard. BACKGROUND

[0002] With reference to Figure 1 , there is a multi-layer corrugated paperboard, which comprises in sequence a face paper layer 1, a first corrugated paper layer 2, an intermediate paper layer 3, a second corrugated paper layer 4 and a bottom paper layer 5, the first corrugated paper layer and the second corrugated paper layer are both corrugated, the crests of the first corrugated paper layer and the crests of the second corrugated paper layer correspond, and the troughs of the first corrugated paper layer and the troughs of the second corrugated paper layer correspond. The two corrugated paper layers play a supporting role for the corrugated paperboard, and compared with ordinary single-layer corrugated paperboard, the structural strength is higher.

[0003] However, in practice, the supporting strength at the corresponding positions of the two crests of the above-mentioned multi-layer corrugated paperboard is relatively strong, but the supporting strength at the corresponding positions of the two troughs is relatively poor. If the overall stress of the corrugated paperboard is relatively uniform, the corrugated paperboard will not deform and the like, but if the stress at the corresponding positions of the two troughs of the corrugated paperboard is relatively large, the surface of the corrugated paperboard will be concave, that is, the structural strength of the existing multi-layer corrugated paperboard needs to be further improved. SUMMARY

[0004] In order to improve the structural strength of the multi-layer corrugated paperboard, the present application provides a multi-layer corrugated paperboard.

[0005] The multi-layer corrugated paperboard provided by the present application adopts the following technical scheme:

[0006] A multi-layer corrugated paperboard comprises in sequence a bottom paper layer, a first corrugated paper layer, an intermediate paper layer, a second corrugated paper layer and a face paper layer, the first corrugated paper layer and the second corrugated paper layer are both corrugated, a plurality of first crests and first troughs are formed on the first corrugated paper layer, and a plurality of second crests and second troughs are formed on the second corrugated paper layer; the first crests and the second troughs correspond and are distributed longitudinally, the first troughs and the second crests correspond and are distributed longitudinally, and a supporting cylinder is arranged in the first trough, and the supporting cylinder supports the face paper layer.

[0007] By adopting the above technical scheme, the first crests of the first corrugated paper layer correspond to the second troughs of the second corrugated paper layer, the first troughs of the first corrugated paper layer correspond to the second crests of the second corrugated paper layer, and they are all distributed longitudally; since the crests and the troughs are both supporting stress points at the vertexes, the supporting strength of the multi-layer corrugated paperboard can be improved by this way; in addition, there is a gap between the first troughs and the face paper layer, so this part is a part with relatively weak supporting strength, and the supporting cylinder arranged in the first trough supports the face paper layer, which helps to compensate for the problem of weak supporting strength at this part, and further helps to improve the structural strength of the multi-layer corrugated paperboard.

[0008] Preferably, a support plate is provided inside the support cylinder, and a reset spring is provided on the first corrugated paper layer. The reset spring abuts against the bottom of the support plate. In the free state, the upper end of the support plate abuts against the inner side of the face paper layer.

[0009] By adopting the above technical solution, and utilizing the support plate that is raised and lowered inside the support cylinder, when the face paper layer is subjected to force at the first trough, the face paper layer deforms downward. At this time, the support plate will descend, and the reset spring will deform. When the pressure is removed, the support plate can be raised and reset under the action of the reset spring, so that the deformed part of the face paper layer can be reset, thus ensuring the flatness of the surface of the multi-layer corrugated cardboard.

[0010] Preferably, a wedge-shaped block is provided on the side of the support plate, and an abutment plate slides on the side of the support cylinder. The abutment plate slides horizontally and consists of a first abutment section, a sliding section, and a second abutment section. The sliding section slides and engages with the support cylinder. The first abutment section is located inside the support cylinder, and its end has a wedge-shaped surface that matches the wedge-shaped block. The second abutment section is located outside the support cylinder. When the support plate descends, the abutment plate slides away from the support cylinder in the cooperation of the wedge-shaped block and the wedge-shaped surface of the first abutment section, and the second abutment section abuts against the first corrugated paper layer.

[0011] By adopting the above technical solution, when the face paper layer is compressed at the first trough, the support plate descends. During this process, under the movement of the wedge block, the wedge-shaped surface of the first abutting section moves along the surface of the wedge block, causing the sliding section to slide on the support cylinder. That is, the second abutting section moves away from the support cylinder and gradually abuts against the first corrugated paper layer, that is, against the side of the first trough. At this time, the upper surface of the support plate is flush with the upper surface of the support cylinder. At this time, the first corrugated paper layer can also provide support for the abutting plate. If the face paper layer is still deforming downwards under pressure at this time, then it is necessary to... The support of the support cylinder and support plate causes both to deform, while the first corrugated paper layer supports the abutment plate. Together with the support cylinder, it supports the face paper layer, thereby further improving the support strength of the face paper layer and preventing deformation of the support cylinder and support plate. When the face paper layer is under pressure, the abutment plate and the first corrugated paper layer abut against each other. At this time, the abutment plate provides lateral support to the first trough, which is also lateral support to the first peak, preventing the first peak from deforming to both sides under pressure. At the same time, the side of the first peak supports the abutment plate, preventing the face paper layer located at the first trough from deforming too much downward.

[0012] Preferably, the reset spring is integrally provided on the opposite side of the first trough, the two reset springs are arranged in a cross arrangement, and a third trough is formed between the reset spring and the first corrugated paper layer; a through hole is opened on the lower side of the support cylinder, and the two reset springs extend into the through hole and abut against the support plate.

[0013] By adopting the above technical solution, the reset spring is integrally set on the opposite side of the first trough. When the support plate is pressed and moves downward, the reset spring will deform downward. At this time, the pressure on the reset spring will be transmitted to the first peak on both sides of the first trough. The first peak will support the reset spring, improving the support strength of the face paper layer at the first trough. At the same time, the reset spring will also generate a support force on the first peak. When the face paper layer is under force at the first peak, the support strength of the first corrugated paper layer at the first peak can be improved. When the pressure on the face paper layer disappears, the reset spring can reset, causing the support plate to move upward and reset, thereby resetting the deformed part of the face paper layer, which helps to ensure the flatness of the face paper layer.

[0014] Preferably, the support plate is provided with a guide plate, and the side of the support cylinder is provided with a guide groove. The guide plate and the guide groove slide together, and the guide groove is distributed along the length direction of the support cylinder.

[0015] By adopting the above technical solution, the cooperation of the guide plate and the guide groove during the lifting and lowering process of the support plate helps to improve the lifting and lowering stability of the support plate and prevent the support plate and support cylinder from misaligning during the pressure descent process, which would affect the effect on the abutment plate.

[0016] Preferably, an elastic connector is provided between the upper ends of the two reset springs; the elastic connector is a rubber band, and the two ends of the rubber band correspond to and are connected to the two reset springs one by one.

[0017] By adopting the above technical solution, the upper ends of the two reset springs are connected by an elastic connector. When the support plate descends, the upper ends of the two reset springs move away from each other. At this time, the elastic connector is in a stretched state, which generates resistance to the movement of the two reset springs, thereby increasing the difficulty of deformation of the two reset springs and blocking the descent of the support plate. This helps to improve the support strength of the support plate against the paper layer. In addition, since the two reset springs are arranged crosswise, they will be tightly pressed together under the action of the elastic connector, generating a large frictional force. This will increase the deformation force of the two reset springs, further increasing the difficulty of descent of the support plate and thus helping to improve the support strength of the support plate against the paper layer. When the pressure is removed, the elastic connector can also reset the two reset springs. Combined with the elastic reset force of the reset springs themselves, this helps to quickly reset the two reset springs, and the increased reset force helps the support plate overcome the deformation of the paper layer and reset the paper layer.

[0018] Preferably, the first corrugated paper layer has an installation opening at the first trough, the lower side of the support cylinder passes through the installation opening and connects to the intermediate paper layer, and the through hole is opened on the lower side of the support cylinder.

[0019] By adopting the above technical solution, the support cylinder is connected to the intermediate paper layer by bonding, which can ensure that the bottom surface of the support cylinder can remain horizontal and prevent the support cylinder from tilting during the deformation process, thus affecting the support effect on the opposite paper layer.

[0020] Preferably, a folded spring is provided on the lower side of the reset spring, the folded spring having a first end and a second end, the first end of the folded spring being connected to the reset spring, and the second end of the folded spring being connected to the lower bottom wall of the through hole.

[0021] By adopting the above technical solution, when the corrugated cardboard is compressed, the reset spring will be deformed by the pressure. At this time, the reset spring will drive the folded spring to press down. The folded spring supports the reset spring and can help the reset spring to reset quickly after the pressure is removed.

[0022] Preferably, the intermediate paper layer has a through-hole at the position corresponding to the installation port, the support cylinder passes through the through-hole, and the internal structure of the support cylinder is distributed in a mirror symmetrical manner with the intermediate paper layer as a mirror surface.

[0023] By adopting the above technical solution, the first trough and the second peak correspond to each other. The support cylinder passes through the through-hole, and the upper and lower sides of the support cylinder are mirrored, which can support the face paper layer and the bottom paper layer. There are two support plates inside, and each of them is equipped with a reset spring to support the two support plates. It can provide support when the face paper layer or the bottom paper layer is under pressure.

[0024] Preferably, the intermediate paper layer is bonded to a support post within the first wave crest, and an abutment sleeve is fitted and slidably fitted onto the support post. The upper side of the abutment sleeve abuts against the first wave crest. A butterfly-shaped spring is fitted onto the support post, one end of which is connected to the abutment sleeve, and the other end of which is connected to the intermediate paper layer. Support fans are rotatably fitted on both sides of the intermediate paper layer located on the support post, and the abutment sleeve and the support fans are connected by a connecting rod. When the face paper layer is deformed by pressure, the abutment sleeve descends, and the connecting rod drives the support fans to rotate towards the side closer to the abutment sleeve and abut against the first wave crest.

[0025] By adopting the above technical solution, when the face paper layer is compressed, the abutment sleeve and the butterfly spring will preferentially act as a buffer. When the face paper layer deforms under pressure, i.e., when the first wave peak deforms, the abutment sleeve moves downwards, and through the connecting rod, it can drive the connecting plate and fan blades to rotate upwards, abutting against the first wave peak. This helps prevent deformation and damage to the first wave peak and improves the support strength of the face paper layer at the first wave peak. By preventing deformation of the first wave peak, the reset spring can always provide support force, which in turn supports the support plate, thus helping to improve the support strength of the face paper layer at the first wave trough. Furthermore, when the fan blades support the first wave peak, the folded shape of the fan blades increases the support area, further improving the support strength.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. The first peak of the first corrugated paper layer corresponds to the second trough of the second corrugated paper layer, and the first trough corresponds to the second peak. That is, the first corrugated paper layer and the second corrugated paper layer are distributed in a mirror image with the middle paper layer located on the mirror surface. In this way, the overall support strength of the multi-layer corrugated cardboard can be improved. In addition, a support cylinder is set in the first trough to support the face paper layer, which helps to further improve the structural strength of the corrugated cardboard.

[0028] 2. When the face paper layer is compressed, the support plate will descend to a state flush with the upper surface of the support cylinder. At this time, the support cylinder supports the face paper layer. During the descent of the support plate, through the cooperation of the wedge block and the abutment plate, the abutment plate will slide away from the support cylinder and contact the part between the first crest and the first trough of the first corrugated paper layer. That is, when the face paper layer is compressed, the abutment plate and the first corrugated paper layer abut against each other, and the two generate an interaction force. The first corrugated paper layer supports the abutment plate, which can improve the support strength of the support plate. At the same time, the abutment plate can support the first corrugated paper layer, which can improve the structural strength of the multi-layer corrugated cardboard.

[0029] 3. Utilizing a reset spring, when the support plate is pressed downwards, the reset spring deforms downwards. At this time, the pressure on the reset spring is transmitted to the first peaks on both sides of the first trough. The first peaks support the reset spring, increasing the support strength of the face paper layer at the first trough. Simultaneously, the reset spring also generates a supporting force on the first peak. When the face paper layer is under force at the first peak, the support strength of the first corrugated paper layer at the first peak is increased. When the pressure on the face paper layer disappears, the reset spring can reset, causing the support plate to move upwards and reset, thereby resetting the deformed part of the face paper layer, which helps to ensure the flatness of the face paper layer. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of multi-layer corrugated cardboard in related technologies;

[0031] Figure 2 This is a schematic diagram of the overall structure of Embodiment 1 of this application;

[0032] Figure 3 This is a cross-sectional view of Embodiment 1 of this application, mainly showing the structure of the support plate and the reset spring;

[0033] Figure 4 This is a partial top view of Embodiment 1 of this application, mainly showing the structure of the guide plate and the guide groove;

[0034] Figure 5 This is a partial structural diagram of Embodiment 1 of this application, mainly illustrating the structure of the rubber band;

[0035] Figure 6 This is a schematic diagram of the overall structure of Embodiment 2 of this application;

[0036] Figure 7 This is a cross-sectional structural diagram of Embodiment 3 of this application;

[0037] Figure 8 This is a cross-sectional structural diagram of Embodiment 4 of this application.

[0038] Reference numerals: 1. Face paper layer; 2. First corrugated paper layer; 21. First crest; 22. First trough; 221. Mounting port; 3. Middle paper layer; 4. Second corrugated paper layer; 41. Second crest; 42. Second trough; 5. Bottom paper layer; 6. Support cylinder; 61. Through hole; 62. Guide groove; 7. Support plate; 71. Wedge block; 72. Guide piece; 8. Reset spring; 81. Third trough; 9. Folded spring; 10. Abutment plate; 101. First abutment section; 102. Sliding section; 103. Second abutment section; 1031. Wedge surface; 20. Rubber band; 30. Through hole; 40. Support post; 50. Abutment sleeve; 60. Butterfly spring; 70. Support fan; 701. Connecting plate; 702. Fan blade; 80. Connecting rod. Detailed Implementation

[0039] The following is in conjunction with the appendix Figures 2-8 This application will be described in further detail.

[0040] This application discloses a multi-layer corrugated cardboard.

[0041] Example 1

[0042] Reference Figure 2The multi-layer corrugated cardboard includes a face paper layer 1, a first corrugated paper layer 2, an intermediate paper layer 3, a second corrugated paper layer 4, and a bottom paper layer 5, with adjacent layers connected by adhesive. Both the first corrugated paper layer 2 and the second corrugated paper layer 4 are wavy. The first corrugated paper layer 2 has several first peaks 21 and first troughs 22, and the second corrugated paper layer 4 has several second peaks 41 and second troughs 42. The first corrugated paper layer 2 and the second corrugated paper layer 4 are mirror images of the intermediate paper layer 3. That is, the first peaks 21 and the second troughs 42 correspond to each other and are distributed longitudinally, and the first troughs 22 and the second peaks 41 correspond to each other and are distributed longitudinally. A support cylinder 6 is also provided in the first trough 22 to support the face paper layer 1.

[0043] Since the apex of the crest and trough are the support stress points, in this application, the apex of the first trough 22 and the apex of the second crest 41 abut together, while the apex of the first crest 21 and the apex of the second trough 42 are far apart. This method can improve the internal support strength of the corrugated cardboard, which helps to improve the overall structural strength of the corrugated cardboard. In addition, the support cylinder 6 in the first trough 22 supports the paper layer 1, which helps to further improve the structural strength of the multi-layer corrugated cardboard.

[0044] Reference Figure 2 and Figure 3 An installation port 221 is provided at the apex of the first trough 22. The bottom of the support cylinder 6 passes through the installation port 221 and is bonded to the middle paper layer 3. The support cylinder 6 is hollow. A support plate 7 is installed inside the support cylinder 6. The upper side of the support plate 7 protrudes from the support cylinder 6. The first corrugated paper layer 2 is located on both sides of the first trough 22 and has reset spring pieces 8 formed. The two reset spring pieces 8 are arranged in a cross pattern. A third trough 81 is formed between the reset spring pieces 8 and the first corrugated paper layer 2. A through hole 61 is provided on the lower side of the side of the support cylinder 6. There are two through holes 61, which correspond one-to-one with the two reset spring pieces 8. The reset spring pieces 8 extend into the corresponding through holes 61 and abut against the bottom of the support plate 7.

[0045] When the corrugated cardboard is not under stress, the upper side of the support plate 7 and the inner side of the face paper layer 1 abut against each other, and the reset spring 8 provides support for the support plate 7. When the face paper layer 1 of the corrugated cardboard is under stress, the face paper layer 1 deforms, causing the support plate 7 to descend and the reset spring 8 to compress. When the pressure is released, the support plate 7 can move upward and reset under the action of the reset spring 8, thereby resetting the face paper layer 1, which helps to ensure the flatness of the surface of the multi-layer corrugated cardboard. In addition, when the reset spring 8 is pressed down and deformed, the force of the reset spring 8 will act on the first corrugated paper layer 2, and the force will be transmitted to the first crest 21, providing support for the first crest 21 and further improving the support strength of the first corrugated paper layer 2. Conversely, the first crest 21 will support the reset spring 8, thereby improving the support strength of the reset spring 8 for the support plate 7.

[0046] A folded spring 9 is bonded to the lower side of the reset spring 8. The folded spring 9 has a first end and a second end. The first end of the folded spring 9 is bonded to the reset spring 8, and the second end of the folded spring 9 is bonded to the lower bottom wall of the through hole 61. When the corrugated cardboard is compressed, the reset spring 8 deforms under the pressure. At this time, the reset spring 8 will cause the folded spring 9 to press down, providing support for the reset spring 8. After the pressure is released, the folded spring 9 helps the reset spring 8 to quickly return to its original position.

[0047] Both sides of the support plate 7 are integrally formed with wedge-shaped blocks 71. Abutment plates 10 slide on opposite sidewalls of the support cylinder 6. The abutment plates 10 slide horizontally, perpendicular to the length direction of the support cylinder 6. Each abutment plate 10 consists of a first abutment section 101, a sliding section 102, and a second abutment section 103. The sliding section 102 slides into the support cylinder 6. The first abutment section 101 is located inside the support cylinder 6, and a wedge-shaped surface 1031 is formed on the side of the first abutment section 101 closest to the support plate 7, which matches and abuts against the wedge-shaped blocks 71. The second abutment section 103 is located on the outside of the support cylinder 6. When the support plate 7 is pressed down, the sliding section 102 slides away from the support cylinder 6 under the cooperation of the wedge-shaped blocks 71 and the wedge-shaped surface 1031 of the first abutment section 101, and the second abutment section 103 abuts against the first corrugated paper layer 2.

[0048] When the face paper layer 1 is compressed, the support plate 7 descends, and the wedge block 71 drives the abutment plate 10 to slide and abut against the first corrugated paper layer 2. At this time, the first corrugated paper layer 2 supports the abutment plate 10, which in turn supports the support plate 7, thus helping to prevent the face paper layer 1 from deforming too much. Conversely, the abutment plate 10 supports the first corrugated paper layer 2, and the force is transmitted to the first peaks 21 on both sides of the first trough 22, which helps to further improve the support strength of the first corrugated paper layer 2.

[0049] Reference Figure 2 and Figure 4 The support plate 7 is also integrally formed with a guide plate 72, and a guide groove 62 is correspondingly opened on the side of the support cylinder 6. The length direction of the guide groove 62 is consistent with the length direction of the support cylinder 6. The guide plate 72 and the guide groove 62 slide and cooperate to guide the lifting and lowering of the support plate 7, and prevent the support plate 7 from being misaligned during the pressure process, which would affect the effect on the abutment plate 10.

[0050] Reference Figure 2 and Figure 5An elastic connector is provided between the upper ends of the two reset springs 8. The elastic connector is a rubber band 20. The two ends of the rubber band 20 correspond one-to-one with the two reset springs 8, and the rubber band 20 is connected to the upper end of the reset springs 8. When the support plate 7 descends, the upper ends of the two reset springs 8 move away from each other. At this time, the rubber band 20 is in a stretched state, which generates resistance to the movement of the two reset springs 8, thereby increasing the difficulty of deformation of the two reset springs 8 and blocking the descent of the support plate 7. This helps to increase the support strength of the support plate 7 for the face paper layer 1. In addition, since the two reset springs 8 are arranged crosswise, under the action of the rubber band 20, the two reset springs 8 will be tightly pressed together, generating a large frictional force, which can increase the deformation force of the two reset springs 8, further increasing the difficulty of descent of the support plate 7 and thus helping to increase the support strength of the support plate 7 for the face paper layer 1. When the pressure is removed, the rubber band 20 can also make the two reset springs 8 reset. Combined with the elastic reset force of the reset springs 8 themselves, it helps the two reset springs 8 to reset quickly, and the reset force is increased, which helps the support plate 7 overcome the deformation of the face paper layer 1 and reset the face paper layer 1.

[0051] In this embodiment of the application, multiple support cylinders 6 are distributed within the same first trough 22. All support cylinders 6 are distributed along the length direction of the first trough 22, and corresponding structures are also provided in multiple ways to match the support cylinders 6.

[0052] The implementation principle of a multi-layer corrugated cardboard according to an embodiment of this application is as follows: the first corrugated paper layer 2 and the second corrugated paper layer 4 are arranged in a mirror image and are approximately distributed in an "X" shape, which helps to improve the support strength of the two corrugated layers for the face paper layer 1; the support plate 7 is connected by a reset spring 8. When the face paper layer 1 is deformed, it will drive the support plate 7 to descend. When the pressure is removed, the reset spring 8 can drive the support plate 7 to reset, thus restoring the deformation of the face paper layer 1; when the support plate 7 descends, the wedge block 71 will drive the abutment plate 10 to slide, so that the abutment plate 10 and the first corrugated paper layer 2 abut against each other. The abutment plate 10 and the first corrugated paper layer 2 will interact with each other, which can support the support plate 7 and also support the first wave crest 21, which helps to improve the support strength of the first corrugated paper layer 2, that is, helps to improve the structural strength of the multi-layer corrugated cardboard.

[0053] Example 2

[0054] Reference Figure 6 The difference between this embodiment and embodiment 1 is that a support cylinder 6 is also installed inside the second wave peak 41, and the internal structure of the support cylinder 6 is the same as that in embodiment 1; that is, when the bottom paper layer 5 is subjected to pressure, the support cylinder 6 and related structures inside the second wave peak 41 can also support the bottom paper layer 5.

[0055] Example 3

[0056] Reference Figure 7 The difference between this embodiment and embodiment 2 is that the intermediate paper layer 3 has a through-hole 30 at the junction of the first trough 22 and the second peak 41. The support cylinder 6 in the first trough 22 and the support cylinder 6 in the second peak 41 are the same support cylinder 6, and the support cylinder 6 passes through the through-hole 30. The internal structure of the support cylinder 6 is mirror-symmetrical with the intermediate paper layer 3 as a mirror surface.

[0057] Example 4

[0058] Reference Figure 8 The difference between this embodiment and embodiment 3 is that a supporting post 40 is bonded and fixed within the first wave crest 21 in the intermediate paper layer 3. An abutment sleeve 50 is fitted and slidably engaged on the supporting post 40, with the upper side 50 abutting against the first wave crest 21. A butterfly-shaped spring piece 60 is fitted on the supporting post 40, with one end of the butterfly-shaped spring piece 60 bonded and fixed to the intermediate paper layer 3 and the other end connected to the abutment sleeve 50. Support fans 70 are rotatably engaged on both sides of the supporting post 40 in the intermediate paper layer 3. The rotatable engagement is achieved by... A rotating rod is formed on layer 3, and a rotating sleeve is formed around the bottom of the supporting fan 70. This rotation method is a traditional shaft hole fit, which will not be described in detail. The supporting fan 70 is made of cardboard and consists of a connecting plate 701 and folded fan blades 702. The fan blades 702 are glued to the connecting plate 701, and the connecting plate 701 rotates on the middle paper layer 3. The connecting plate 701 and the abutting sleeve 50 are connected by a connecting rod 80. One end of the connecting rod 80 is hinged to the connecting plate 701, and the other end is hinged to the abutting sleeve 50. When the face paper layer 1 is pressed, the face paper layer 1 deforms and causes the abutment sleeve 50 to descend. During the descent of the abutment sleeve 50, the connecting plate 701 rotates upward and moves towards the abutment sleeve 50, causing the fan blade 702 to gradually come into contact with the first wave crest 21. Conversely, when the pressure on the face paper layer 1 disappears, under the action of the butterfly spring 60, the abutment sleeve 50 rises and comes into contact with the first wave crest 21. At this time, the fan blade 702 will gradually separate from the first wave crest 21.

[0059] When the face paper layer 1 is compressed, the abutment sleeve 50 and the butterfly spring 60 will preferentially act as a buffer. When the face paper layer 1 is compressed and deformed, that is, when the first wave peak 21 is deformed, the abutment sleeve 50 moves downward, and through the connecting rod 80, it can drive the connecting plate 701 and the fan blade 702 to rotate upward, abutting against the first wave peak 21. This helps to prevent the first wave peak 21 from deforming and being damaged, and also helps to improve the support strength of the face paper layer 1 at the first wave peak 21. By preventing the first wave peak 21 from deforming, the reset spring 8 can always provide support force, which in turn can support the support plate 7, thus helping to improve the support strength of the face paper layer 1 at the first wave trough 22. In addition, when the fan blade 702 supports the first wave peak 21, because the fan blade 702 is folded, the support area can be increased, which helps to further improve the support strength.

[0060] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A multi-layer corrugated cardboard, comprising, in sequence, a face paper layer (1), a first corrugated paper layer (2), an intermediate paper layer (3), a second corrugated paper layer (4), and a bottom paper layer (5), wherein both the first corrugated paper layer (2) and the second corrugated paper layer (4) are wavy, wherein the first corrugated paper layer (2) has a plurality of first peaks (21) and first troughs (22), and the second corrugated paper layer (4) has a plurality of second peaks (41) and second troughs (42); characterized in that: The first peak (21) and the second trough (42) correspond to each other and are distributed longitudinally, the first trough (22) and the second peak (41) correspond to each other and are distributed longitudinally, and a support cylinder (6) is provided in the first trough (22), the support cylinder (6) supports the paper layer (1); A support plate (7) is provided inside the support cylinder (6) and a reset spring (8) is provided on the first corrugated paper layer (2). The reset spring (8) and the bottom of the support plate (7) abut against each other. In the free state, the upper end of the support plate (7) abuts against the inner side of the face paper layer (1). A wedge-shaped block (71) is provided on the side of the support plate (7), and an abutment plate (10) slides on the side of the support cylinder (6). The abutment plate (10) slides horizontally and is composed of a first abutment section (101), a sliding section (102), and a second abutment section (103). The sliding section (102) and the support cylinder (6) slide together. The first abutment section (101) is located inside the support cylinder (6), and the first... The end of the abutment section (101) is formed with a wedge-shaped surface (1031) that is adapted to the wedge block (71), and the second abutment section (103) is located on the outside of the support cylinder (6); when the support plate (7) descends, the abutment plate (10) slides away from the support cylinder (6) in the cooperation of the wedge block (71) and the wedge-shaped surface (1031) of the first abutment section (101), and the second abutment section (103) abuts against the first corrugated paper layer (2).

2. The multi-layer corrugated cardboard according to claim 1, characterized in that: The first trough (22) is integrally provided with the reset spring (8) on the opposite side. The two reset springs (8) are arranged in a cross arrangement, and a third trough (81) is formed between the reset spring (8) and the first corrugated paper layer (2). The lower side of the support cylinder (6) is provided with a through hole (61), and the two reset springs (8) extend into the through hole (61) and abut against the support plate (7).

3. The multi-layer corrugated cardboard according to claim 1, characterized in that: The support plate (7) is provided with a guide plate (72), and the side of the support cylinder (6) is provided with a guide groove (62). The guide plate (72) and the guide groove (62) slide together, and the guide groove (62) is distributed along the length direction of the support cylinder (6).

4. A multi-layer corrugated cardboard according to claim 2, characterized in that: An elastic connector is provided between the upper ends of the two reset springs (8); the elastic connector is a rubber band (20), and the two ends of the rubber band (20) correspond to and are connected to the two reset springs (8).

5. A multi-layer corrugated cardboard according to claim 2, characterized in that: The first corrugated paper layer (2) has an installation port (221) at the first trough (22). The lower side of the support cylinder (6) passes through the installation port (221) and connects with the middle paper layer (3). The through hole (61) is opened on the lower side of the support cylinder (6).

6. A multi-layer corrugated cardboard according to claim 5, characterized in that: A folded spring (9) is provided on the lower side of the reset spring (8). A first end and a second end are formed on the folded spring (9). The first end of the folded spring (9) is connected to the reset spring (8), and the second end of the folded spring (9) is connected to the lower bottom wall of the through hole (61).

7. A multi-layer corrugated cardboard according to claim 5, characterized in that: The intermediate paper layer (3) has a through-hole (30) at the position corresponding to the mounting port (221), the support cylinder (6) passes through the through-hole (30), and the internal structure of the support cylinder (6) is symmetrically distributed in a mirror image with the intermediate paper layer (3) as a mirror surface.

8. A multi-layer corrugated cardboard according to claim 1, characterized in that: The intermediate paper layer (3) is bonded to a support post (40) inside the first wave crest (21). A retaining sleeve (50) is fitted and slidably fitted on the support post (40). The upper side of the retaining sleeve (50) abuts against the first wave crest (21). A butterfly-shaped spring piece (60) is fitted on the support post (40). One end of the butterfly-shaped spring piece (60) is connected to the retaining sleeve (50), and the other end of the butterfly-shaped spring piece (60) is connected to the intermediate paper layer (3). The intermediate paper layer (3) is rotatably fitted with a support fan (70) on both sides of the support post (40). The retaining sleeve (50) and the support fan (70) are connected by a connecting rod (80). When the face paper layer (1) is deformed by pressure, the retaining sleeve (50) descends, and the connecting rod (80) drives the support fan (70) to rotate towards the side closer to the retaining sleeve (50) and abut against the first wave crest (21).

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