Toughening type high-strength corrugated paper with multi-layer structure and preparation method of toughening type high-strength corrugated paper

Abstract

The invention relates to the technical field of corrugated paper, in particular to toughened high-strength corrugated paper with a multi-layer structure and a preparation method thereof, and the corrugated paper comprises an upper paper layer, a lower paper layer and a corrugated paper layer; a plurality of corrugated units A and corrugated units B are alternately arranged on the corrugated paper layer in the length direction; each A corrugated unit comprises a first A wave trough part, a first A wave crest part, a second A wave trough part, a second A wave crest part and a third A wave trough part which are connected in sequence; and each B corrugated unit comprises a first B wave trough part, a first B wave crest part, a second B wave trough part, a second B wave crest part and a third B wave trough part which are connected in sequence. Through cooperation of the corrugated units A and the corrugated units B, the three-stage buffering function of the elastic arms, the wave crest parts and the scroll parts is achieved, and therefore the toughness and strength of the corrugated paper can be effectively enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of corrugated paper, and particularly relates to a toughened high-strength corrugated paper with a multi-layer structure and a preparation method thereof. Background Art

[0002] In the technical field of packaging materials, high-strength corrugated paper is widely used in industries such as logistics transportation and product packaging due to its good buffering performance and mechanical strength. At present, the corrugated layer of traditional high-strength corrugated paper generally adopts a symmetric structure design. By bonding the corrugated paper with the face paper layer, a regular triangular three-dimensional support structure is constructed to improve the overall compressive strength and load-bearing capacity. This design idea of the symmetric structure effectively enhances the rigidity of the corrugated paper to a certain extent, enabling it to meet the basic strength requirements in conventional packaging scenarios.

[0003] However, this symmetric structure design has obvious defects. Since the corrugated layer is symmetric, the formed triangular three-dimensional structure is too rigid. When subjected to external impact forces, extrusion forces and other acting forces, the corrugated paper cannot adaptively deform according to the force situation and is difficult to absorb and buffer energy through its own deformation. For example, during the logistics transportation process, when the packaged item encounters collision or extrusion, the traditional high-strength corrugated paper lacks the ability of buffer deformation and cannot effectively disperse the impact force, resulting in the internal product being easily damaged. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a toughened high-strength corrugated paper with a multi-layer structure and a preparation method thereof.

[0005] The purpose of the present invention is achieved through the following technical solutions: A toughened high-strength corrugated paper with a multi-layer structure includes an upper face paper layer, a lower face paper layer, and a corrugated paper layer; a plurality of A corrugated units and B corrugated units are alternately arranged along the length direction of the corrugated paper layer;

[0006] The A corrugated unit includes a first A trough portion, a first A peak portion, a second A trough portion, a second A peak portion, and a third A trough portion connected in sequence; a first elastic arm is provided at the top of the second A trough portion; first scroll portions are wound around both the first A trough portion and the third A trough portion; first deformation spaces are formed between both the first A peak portion and the lower face paper layer and between the second A peak portion and the lower face paper layer;

[0007] The B corrugated unit includes a first B trough portion, a first B peak portion, a second B trough portion, a second B peak portion, and a third B trough portion connected in sequence; a second elastic arm is provided at the top of the second B trough portion; second scroll portions are wound around both the first B trough portion and the third B trough portion; second deformation spaces are formed between both the first B peak portion and the lower face paper layer and between the second B peak portion and the lower face paper layer;

[0008] The bottom of the second A trough part and the bottom of the second B trough part are respectively fixedly connected to the lower paper layer; the top of the first elastic arm and the top of the second elastic arm are respectively fixedly connected to the upper paper layer; the first scroll part is arranged in the second deformation space; the second scroll part is arranged in the first deformation space.

[0009] In a further technical solution, both the A corrugated unit and the B corrugated unit are made of an elastic deformation material.

[0010] In a further technical solution, the second scroll part at the first B trough part is movably arranged in the first deformation space formed between the second A peak part and the lower paper layer of the adjacent upper A corrugated unit; the second scroll part at the third B trough part is movably arranged in the first deformation space formed between the first A peak part and the lower paper layer of the adjacent lower A corrugated unit.

[0011] In a further technical solution, the first scroll part at the first A trough part is movably arranged in the second deformation space formed between the second A peak part and the lower paper layer of the adjacent upper B corrugated unit; the first scroll part at the third A trough part is movably arranged in the second deformation space formed between the first B peak part and the lower paper layer of the adjacent lower B corrugated unit.

[0012] In a further technical solution, both the first A trough part and the third A trough part are provided with a plurality of first scroll parts along the width direction; a first relief groove communicating with the first deformation space is formed between two adjacent first scroll parts; the second scroll part enters the first deformation space through the first relief groove.

[0013] In a further technical solution, both the first B trough part and the third B trough part are provided with a plurality of second scroll parts along the width direction; a second relief groove communicating with the second deformation space is formed between two adjacent second scroll parts; the first scroll part enters the second deformation space through the second relief groove.

[0014] In a further technical solution, the first scroll part and the second scroll part are staggered in the width direction.

[0015] In a further technical solution, the first elastic arm includes a first S-shaped arm; the second elastic arms each include a second S-shaped arm; the bottom of the first S-shaped arm is fixedly connected to the top of the second A trough part; a first planar arm extends from the top of the first S-shaped arm; the bottom of the second S-shaped arm is fixedly connected to the top of the second B trough part; a second planar arm extends from the top of the second S-shaped arm; the first planar arm and the second planar arm are respectively fixedly connected to the upper paper layer.

[0016] In a further technical solution, the extending direction of the first planar arm is opposite to that of the second planar arm.

[0017] A preparation method of a toughened high-strength corrugated paper for a multi-layer structure includes the following steps:

[0018] S1. Using a die-cutting process to punch and cut out the outer contour of the A corrugated unit, the outer contour of the B corrugated unit, the outer contour of the first elastic arm, and the outer contour of the second elastic arm from the corrugated base paper, thereby obtaining a punched part;

[0019] S2. Through a spraying adhesive process, spraying EVA hot melt adhesive on the surface of the punched part, thereby obtaining a toughened part;

[0020] S3. Through a spraying adhesive process, spraying PU adhesive on the parts of the toughened part that need to be wound, thereby obtaining an anti-friction sprayed adhesive part;

[0021] S4. Heating the anti-friction sprayed adhesive part to soften the EVA hot melt adhesive, and using a molding process for molding, and obtaining a molded part after opening the mold and cooling;

[0022] S5. Heating the parts to be wound of the molded part to soften the EVA hot melt adhesive, and using a winding machine to wind the parts to be wound into a scroll shape, and obtaining the A corrugated unit and the B corrugated unit after cooling and shaping;

[0023] S5. Using a dotting machine to coat adhesive on the A corrugated unit and the B corrugated unit, arranging the A corrugated unit and the B corrugated unit alternately on the lower paper layer, covering the upper paper layer after completion, and obtaining the toughened high-strength corrugated paper for the multi-layer structure after the adhesive dries.

[0024] The advantages of the present invention compared with the prior art are: through the cooperation of the A corrugated unit and the B corrugated unit, the present invention realizes the three-level buffering function of the elastic arm, the wave crest part, and the scroll part, thereby being able to effectively enhance the toughness and strength of the corrugated paper. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description only relate to some embodiments of the present disclosure and do not limit the present disclosure.

[0026] Figure 1 is a schematic structural diagram of the present invention;

[0027] Figure 2 is a front view of the present invention;

[0028] Figure 3 is a schematic structural diagram of the present invention after hiding the upper paper layer;

[0029] Figure 4 It is a schematic structural diagram of the A corrugated unit of the present invention;

[0030] Figure 5 It is a schematic structural diagram of the B corrugated unit of the present invention;

[0031] Figure 6 It is a front view of the present invention after being impacted;

[0032] Figure 7 It is a schematic structural diagram of the blanking part of the present invention;

[0033] Figure 8 It is a schematic structural diagram of the compression molding part of the present invention;

[0034] Wherein: 11, upper paper layer; 12, lower paper layer; 2, A corrugated unit; 21, first A trough part; 22, first A peak part; 23, second A trough part; 24, second A peak part; 25, third A trough part; 31, first elastic arm; 32, first scroll part; 33, first deformation space; 4, B corrugated unit; 41, first B trough part; 42, first B peak part; 43, second B trough part; 44, second B peak part; 45, third B trough part; 51, second elastic arm; 52, second scroll part; 53, second deformation space; 61, first relief groove; 62, second relief groove; 71, first S-shaped arm; 72, first flat arm; 81, second S-shaped arm; 82, second flat arm. Specific embodiments

[0035] To make the purpose, technical solutions and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the accompanying drawings.

[0036] From Figures 1 to 8 it can be seen that in the toughened high-strength corrugated paper with a multi-layer structure in this embodiment, it includes an upper paper layer 11, a lower paper layer 12 and a corrugated paper layer; the corrugated paper layer is alternately provided with a plurality of A corrugated units 2 and B corrugated units 4 along the length direction;

[0037] The A corrugated unit 2 includes a first A trough part 21, a first A peak part 22, a second A trough part 23, a second A peak part 24 and a third A trough part 25 connected in sequence; a first elastic arm 31 is provided at the top of the second A trough part 23; both the first A trough part 21 and the third A trough part 25 are wound to form a first scroll part 32; a first deformation space 33 is formed between the first A peak part 22 and the lower paper layer 12 and between the second A peak part 24 and the lower paper layer 12;

[0038] The B corrugated unit 4 includes a first B trough portion 41, a first B peak portion 42, a second B trough portion 43, a second B peak portion 44, and a third B trough portion 45 connected in sequence; a second elastic arm 51 is provided at the top of the second B trough portion 43; second scroll portions 52 are formed by winding both the first B trough portion 41 and the third B trough portion 45; second deformation spaces 53 are formed between the first B peak portion 42 and the lower paper layer 12 and between the second B peak portion 44 and the lower paper layer 12;

[0039] The bottom of the second A trough portion 23 and the bottom of the second B trough portion 43 are respectively fixedly connected to the lower paper layer 12; the top of the first elastic arm 31 and the top of the second elastic arm 51 are respectively fixedly connected to the upper paper layer 11; the first scroll portion 32 is disposed in the second deformation space 53; the second scroll portion 52 is disposed in the first deformation space 33; wherein the elasticity of the first elastic arm 31 and the elasticity of the second elastic arm 51 are both less than the elasticity of the first A peak portion 22, the second A peak portion 24, the first B peak portion 42, and the second B peak portion 44, and the elasticity of the first A peak portion 22, the second A peak portion 24, the first B peak portion 42, and the second B peak portion 44 are all less than the elasticity of the first scroll portion 32 and the elasticity of the second scroll portion 52.

[0040] Specifically, for the toughened high-strength corrugated paper of the multi-layer structure in this embodiment, when the first scroll portion 32 and the second scroll portion 52 are under pressure, they can undergo curling deformation to absorb the external impact force until they are completely curled and deformed to form a rigid support for the first A peak portion 22, the second A peak portion 24, the first B peak portion 42, and the second B peak portion 44; when the corrugated paper is impacted, the first elastic arm 31 and the second elastic arm 51 play a first buffering role, and then the first A peak portion 22, the second A peak portion 24, the first B peak portion 42, and the second B peak portion 44 undergo deformation to play a second buffering role. When the first A peak portion 22, the second A peak portion 24, the first B peak portion 42, and the second B peak portion 44 are completely pressed down, the top of the outer wall of the first scroll portion 32 abuts against the bottom of the first B peak portion 42 and the second B peak portion 44 respectively, the bottom of the outer wall of the first scroll portion 32 abuts against the lower paper layer 12, the top of the outer wall of the second scroll portion 52 abuts against the bottom of the first A peak portion 22 and the second A peak portion 24 respectively, and the bottom of the outer wall of the second scroll portion 52 abuts against the lower paper layer 12, making the overall strength relatively high, and the first scroll portion 32 and the second scroll portion 52 play a third buffering role, thereby forming a hierarchical energy absorption when the corrugated paper is impacted by the outside world and preventing the corrugated paper from being broken and damaged under the external impact.

[0041] In this embodiment, the A corrugated unit 2 and the B corrugated unit 4 are both made of elastic deformation material. The above arrangement enables the multi-layer structure of toughened high-strength corrugated paper to have sufficient toughness and strength.

[0042] In this embodiment, the second scroll portion 52 at the first B wave valley portion 41 is movably disposed in the first deformation space 33 formed between the second A wave peak portion 24 and the lower paper layer 12 of the adjacent previous A corrugated paper unit 2; the second scroll portion 52 at the third B wave valley portion 45 is movably disposed in the first deformation space 33 formed between the first A wave peak portion 22 and the lower paper layer 12 of the adjacent next A corrugated paper unit 2. Through the above arrangement, the second scroll portion 52 is disposed in the first deformation space 33 on both sides of the A corrugated paper unit 2, thereby improving the overall toughness and strength of the toughened high-strength corrugated paper.

[0043] In this embodiment, the first scroll portion 32 at the first A wave valley portion 21 is movably disposed in the second deformation space 53 formed between the second A wave peak portion 24 and the lower paper layer 12 of the adjacent previous B corrugated unit 4; the first scroll portion 32 at the third A wave valley portion 25 is movably disposed in the second deformation space 53 formed between the first B wave peak portion 42 and the lower paper layer 12 of the adjacent next B corrugated unit 4. Through the above arrangement, the first scroll portion 32 is disposed in the second deformation space 53 on both sides of the B corrugated unit 4, thereby improving the overall toughness and strength of the toughened high-strength corrugated paper.

[0044] In this embodiment, the first A wave valley 21 and the third A wave valley 25 are both provided with a plurality of first scroll portions 32 along the width direction; a first clearance groove 61 communicating with the first deformation space 33 is provided between two adjacent first scroll portions 32; and the second scroll portion 52 enters the first deformation space 33 through the first clearance groove 61. The above arrangement makes the force of the toughened high-strength corrugated paper uniform, and facilitates the second scroll portion 52 to enter the first deformation space 33.

[0045] In this embodiment, the first B wave valley 41 and the third B wave valley 45 are both provided with a plurality of second scroll portions 52 along the width direction; a second clearance groove 62 communicating with the second deformation space 53 is provided between two adjacent second scroll portions 52; the first scroll portion 32 enters the second deformation space 53 through the second clearance groove 62. The above arrangement makes the force of the toughened high-strength corrugated paper uniform, and facilitates the first scroll portion 32 to enter the second deformation space 53.

[0046] In this embodiment, the first scroll portion 32 and the second scroll portion 52 are arranged alternately in the width direction. The above arrangement can further make the toughened high-strength corrugated paper bear force evenly, and effectively improve the overall toughness and strength of the toughened high-strength corrugated paper.

[0047] In this embodiment, the first elastic arm 31 includes a first S-shaped arm 71; the second elastic arm 51 includes a second S-shaped arm 81; the bottom of the first S-shaped arm 71 is fixedly connected to the top of the second A wave valley 23; the top of the first S-shaped arm 71 is extended with a first plane arm 72; the bottom of the second S-shaped arm 81 is fixedly connected to the top of the second B wave valley 43; the top of the second S-shaped arm 81 is extended with a second plane arm 82; the first plane arm 72 and the second plane arm 82 are respectively fixedly connected to the upper paper layer 11. The above configuration enables the first elastic arm 31 and the second elastic arm 51 to have sufficient buffering capacity.

[0048] In this embodiment, the extension direction of the first planar arm 72 is opposite to the extension direction of the second planar arm 82. The above arrangement can further make the toughened high-strength corrugated paper bear force evenly, effectively improving the overall toughness and strength of the toughened high-strength corrugated paper.

[0049] In this embodiment, a method for preparing a multi-layer structured toughened high-strength corrugated paper comprises the following steps:

[0050] S1, using a die-cutting process to punch out the outline of the A corrugated unit 2, the outline of the B corrugated unit 4, the outline of the first elastic arm 31 and the outline of the second elastic arm 51 from the corrugated layer paper, so as to obtain a punched part; both sides of the punched part are the first clearance groove 61 or the second clearance groove 62;

[0051] S2. Spray EVA hot melt adhesive on the surface of the blanking part through the glue spraying process to enhance the rigidity and toughness of the blanking part. The dry film thickness of the EVA hot melt adhesive is controlled within the range of 35-55um, thereby obtaining a toughened part;

[0052] S3, spraying PU adhesive on the part of the toughened part that needs to be wound by spraying process to reduce the friction between the scroll layers, and the dry film thickness of the PU adhesive is controlled within the range of 10-15um, so as to obtain a friction-reducing sprayed part;

[0053] S4, heating the anti-friction spray glue part to 85-95°C to soften the EVA hot melt adhesive, performing compression molding by a compression molding process, and obtaining a compression molded part after the mold is opened and cooled; thereby forming a first elastic arm 31, a second elastic arm 51, a first A wave peak portion 22, a second A wave valley portion 23, a second A wave peak portion 24, a first B wave peak portion 42, a second B wave valley portion 43 and a second B wave peak portion 44;

[0054] S5. Heat the winding part of the compression molding to 85 - 95 °C to soften the EVA hot melt adhesive. Use a winding machine to wind the winding part into a scroll shape, forming a first scroll part 32 and a second scroll part 52. After cooling and shaping, obtain the A corrugated unit 2 and the B corrugated unit 4;

[0055] S5. Apply an adhesive to the A corrugated unit 2 and the B corrugated unit 4 using a dotting machine. Specifically, apply the adhesive to the top of the first elastic arm 31, the top of the second elastic arm 51, the bottom of the second A wave valley part 23, and the bottom of the second B wave valley part 43. Then, alternately arrange the A corrugated unit 2 and the B corrugated unit 4 on the lower paper layer 12. After completion, cover the upper paper layer 11. After the adhesive dries, obtain the toughened high-strength corrugated paper with a multi-layer structure.

[0056] The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A toughened high-strength corrugated paper with a multi-layer structure, characterized in that: It comprises an upper paper layer, a lower paper layer and a corrugated paper layer; the corrugated paper layer is provided with a plurality of A corrugated units and B corrugated units alternately along the length direction; The A corrugated unit comprises a first A wave valley portion, a first A wave peak portion, a second A wave valley portion, a second A wave peak portion and a third A wave valley portion connected in sequence; a first elastic arm is provided on the top of the second A wave valley portion; the first A wave valley portion and the third A wave valley portion are both wound to form a first volute portion; a first deformation space is formed between the first A wave peak portion and the underlying paper layer and between the second A wave peak portion and the underlying paper layer; The B corrugated unit comprises a first B wave valley, a first B wave peak, a second B wave valley, a second B wave peak and a third B wave valley connected in sequence; a second elastic arm is provided on the top of the second B wave valley; the first B wave valley and the third B wave valley are both wound to form a second volute; a second deformation space is formed between the first B wave peak and the underlying paper layer and between the second B wave peak and the underlying paper layer; The bottom of the second A wave trough portion and the bottom of the second B wave trough portion are respectively fixedly connected to the lower paper layer; the top of the first elastic arm and the top of the second elastic arm are respectively fixedly connected to the upper paper layer; the first scroll portion is arranged in the second deformation space; and the second scroll portion is arranged in the first deformation space.

2. The toughened high-strength corrugated paper with a multi-layer structure according to claim 1, characterized in that: The A corrugated unit and the B corrugated unit are both made of elastic deformation material.

3. The toughened high-strength corrugated paper with a multi-layer structure according to claim 1, characterized in that: The second scroll portion at the first B wave trough portion is movably arranged in the first deformation space formed between the second A wave peak portion and the underlying paper layer of the adjacent previous A corrugated unit; the second scroll portion at the third B wave trough portion is movably arranged in the first deformation space formed between the first A wave peak portion and the underlying paper layer of the adjacent next A corrugated unit.

4. A toughened high-strength corrugated paper with a multi-layer structure according to claim 1, characterized in that: The first scroll portion at the first A wave trough portion is movably arranged in the second deformation space formed between the second A wave peak portion and the underlying paper layer of the adjacent previous B corrugated unit; the first scroll portion at the third A wave trough portion is movably arranged in the second deformation space formed between the first B wave peak portion and the underlying paper layer of the adjacent next B corrugated unit.

5. A toughened high-strength corrugated paper with a multi-layer structure according to claim 1, characterized in that: The first A wave valley portion and the third A wave valley portion are both provided with a plurality of first scroll portions along the width direction; a first clearance groove connected to the first deformation space is provided between two adjacent first scroll portions; and the second scroll portion enters the first deformation space through the first clearance groove.

6. A toughened high-strength corrugated paper with a multi-layer structure according to claim 1, characterized in that: The first B wave valley and the third B wave valley are both provided with a plurality of second scroll parts along the width direction; a second clearance groove connected to the second deformation space is provided between two adjacent second scroll parts; and the first scroll part enters the second deformation space through the second clearance groove.

7. A toughened high-strength corrugated paper with a multi-layer structure according to claim 1, characterized in that: The first scroll portion and the second scroll portion are alternately arranged in a width direction.

8. A toughened high-strength corrugated paper with a multi-layer structure according to claim 1, characterized in that: The first elastic arm includes a first S-shaped arm; each of the second elastic arms includes a second S-shaped arm; the bottom of the first S-shaped arm is fixedly connected to the top of the second A-wave valley portion; a first planar arm extends from the top of the first S-shaped arm; the bottom of the second S-shaped arm is fixedly connected to the top of the second B-wave valley portion; a second planar arm extends from the top of the second S-shaped arm; the first planar arm and the second planar arm are respectively fixedly connected to the upper paper layer.

9. The toughened high-strength corrugated paper with a multi-layer structure according to claim 8, wherein: The extending direction of the first planar arm is opposite to that of the second planar arm.

10. A preparation method of a toughened high-strength corrugated paper for the multi-layer structure according to any one of claims 1-8, characterized in that: It includes the following steps: S1. Using a die-cutting process to punch and cut out the outer contour of the A corrugated unit, the outer contour of the B corrugated unit, the outer contour of the first elastic arm, and the outer contour of the second elastic arm from the corrugated paper layer, so as to obtain a punched part; S2. Through a spraying adhesive process, spraying EVA hot melt adhesive on the surface of the punched part to obtain a toughened part; S3. Through a spraying adhesive process, spraying PU adhesive on the part to be wound on the toughened part to obtain a friction-reducing sprayed adhesive part; S4. Heating the friction-reducing sprayed adhesive part to soften the EVA hot melt adhesive, and using a molding process for molding, and obtaining a molded part after opening the mold and cooling; S5. Heating the part to be wound of the molded part to soften the EVA hot melt adhesive, and using a winding machine to wind the part to be wound into a scroll shape, and obtaining the A corrugated unit and the B corrugated unit after cooling and shaping; S5. Using a dispensing machine to apply adhesive on the A corrugated unit and the B corrugated unit, arranging the A corrugated unit and the B corrugated unit alternately on the lower paper layer, covering the upper paper layer after completion, and obtaining a toughened high-strength corrugated paper with a multi-layer structure after the adhesive dries.

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