A multi-layered structure of a high-strength corrugated paper and a method of manufacturing the same

Abstract

The present application relates to the technical field of corrugated paper, in particular to a multilayer structure toughened high-strength corrugated paper and a preparation method thereof, comprising upper paper layers, lower paper layers and corrugated paper layers; the corrugated paper layers are alternately provided with a plurality of A corrugated units and B corrugated units along the length direction; the A corrugated unit comprises a first A valley portion, a first A peak portion, a second A valley portion, a second A peak portion and a third A valley portion connected in sequence; the B corrugated unit comprises a first B valley portion, a first B peak portion, a second B valley portion, a second B peak portion and a third B valley portion connected in sequence. The present application realizes the three-stage buffering function of the elastic arm, the peak portion and the vortex portion through the cooperation of the A corrugated unit and the B corrugated unit, so as to effectively enhance the toughness and strength of the corrugated paper.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of corrugated paper, in particular to a multilayer structure of toughened high-strength corrugated paper and a preparation method thereof. BACKGROUND

[0002] In the technical field of packaging materials, high-strength corrugated paper is widely used in logistics transportation, product packaging and other industries due to its good cushioning performance and mechanical strength. At present, the corrugated layer of traditional high-strength corrugated paper generally adopts a symmetrical structure design, which constructs a regular triangular three-dimensional support structure by bonding the corrugated paper and the surface paper layer, so as to improve the overall compressive strength and carrying capacity. The design idea of this symmetrical structure effectively enhances the rigidity of the corrugated paper to a certain extent, so that it can meet the basic demand for strength in the conventional packaging scene.

[0003] However, the design of this symmetrical structure has obvious defects. Since the corrugated layer is symmetrical, the triangular three-dimensional structure formed is too rigid, and the corrugated paper cannot adaptively deform according to the stress condition when subjected to external impact force, extrusion force and other forces, and it is difficult to absorb and buffer energy through its own deformation; for example, during the logistics transportation process, when the packaging piece encounters collision and extrusion, the traditional high-strength corrugated paper lacks cushioning deformation ability and cannot effectively disperse the impact force, so that the internal product is easily damaged. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a multilayer structure of toughened high-strength corrugated paper and a preparation method thereof.

[0005] The purpose of the present application is achieved by the following technical scheme: a multilayer structure of toughened high-strength corrugated paper, comprising an upper surface paper layer, a lower surface 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;

[0006] The A corrugated unit comprises a first A valley portion, a first A peak portion, a second A valley portion, a second A peak portion and a third A valley portion connected in sequence; the top of the second A valley portion is provided with a first elastic arm; the first A valley portion and the third A valley portion are both wound to form a first spiral portion; the first A peak portion and the lower surface paper layer and the second A peak portion and the lower surface paper layer both form a first deformation space;

[0007] The B corrugated unit comprises a first B valley portion, a first B peak portion, a second B valley portion, a second B peak portion and a third B valley portion connected in sequence; the top of the second B valley portion is provided with a second elastic arm; the first B valley portion and the third B valley portion are both wound to form a second spiral portion; the first B peak portion and the lower surface paper layer and the second B peak portion and the lower surface paper layer both form a second deformation space;

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

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

[0010] In a further technical solution, the second spiral part at the first B valley 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; and the second spiral part at the third B valley 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 spiral part at the first A valley 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; and the first spiral part at the third A valley 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, the first A valley part and the third A valley part are both provided with a plurality of first spiral parts along the width direction; a first displacement slot in communication with the first deformation space is arranged between adjacent two first spiral parts; and the second spiral part enters the first deformation space through the first displacement slot.

[0013] In a further technical solution, the first B valley part and the third B valley part are both provided with a plurality of second spiral parts along the width direction; a second displacement slot in communication with the second deformation space is arranged between adjacent two second spiral parts; and the first spiral part enters the second deformation space through the second displacement slot.

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

[0015] In a further technical solution, the first elastic arm comprises a first S-shaped arm; the second elastic arm comprises a second S-shaped arm; the bottom of the first S-shaped arm is fixedly connected with the top of the second A valley part; the top of the first S-shaped arm extends a first planar arm; the bottom of the second S-shaped arm is fixedly connected with the top of the second B valley part; the top of the second S-shaped arm extends a second planar arm; and the first planar arm and the second planar arm are fixedly connected with the upper paper layer respectively.

[0016] Further technical solutions, the extension direction of the first planar arm is opposite to the extension direction of the second planar arm.

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

[0018] S1, using a die cutting process to punch and cut the outline of the A corrugated unit, the outline of the B corrugated unit, the outline of the first elastic arm and the outline of the second elastic arm from the corrugated layer paper, thereby obtaining a punched part;

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

[0020] S3, spraying PU adhesive on the part of the toughened part that needs to be wound by the glue spraying process, thereby obtaining a friction-reducing glue spraying part;

[0021] S4, heating the friction-reducing glue spraying part to soften the EVA hot melt glue, and using a mold pressing forming process to mold and form, and after opening the mold and cooling, a mold pressing forming part is obtained;

[0022] S5, heating the part to be wound of the mold pressing forming part to soften the EVA hot melt glue, and using a winding machine to wind the part to be wound into a vortex shape, and after cooling and setting, an A corrugated unit and a B corrugated unit are obtained;

[0023] S5, using a dispensing machine to coat an adhesive on the A corrugated unit and the B corrugated unit, and arranging the A corrugated unit and the B corrugated unit alternately on the lower paper layer, and covering the upper paper layer after completion, and obtaining a multi-layer structure of a toughened high-strength corrugated paper after the adhesive is dried.

[0024] The present application has the advantages compared with the prior art: the present application realizes the three-stage buffer function of the elastic arm, the wave peak part and the vortex part through the cooperation of the A corrugated unit and the B corrugated unit, thereby effectively enhancing the toughness and strength of the corrugated paper. BRIEF DESCRIPTION OF DRAWINGS

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

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

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

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

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

[0030] Figure 5 This is a schematic diagram of the structure of the B-type corrugated unit of the present invention;

[0031] Figure 6 This is a front view of the invention after it has been subjected to an impact;

[0032] Figure 7 This is a schematic diagram of the structure of the stamped part of the present invention;

[0033] Figure 8 This is a schematic diagram of the structure of the molded part of the present invention;

[0034] Wherein: 11, top paper layer; 12, bottom paper layer; 2, A-corrugated unit; 21, first A-trough; 22, first A-peak; 23, second A-trough; 24, second A-peak; 25, third A-trough; 31, first elastic arm; 32, first spiral section; 33, first deformation space; 4, B-corrugated unit; 41, first B-trough; 42, first B-peak; 43, second B-trough; 44, second B-peak; 45, third B-trough; 51, second elastic arm; 52, second spiral section; 53, second deformation space; 61, first clearance groove; 62, second clearance groove; 71, first S-shaped arm; 72, first planar arm; 81, second S-shaped arm; 82, second planar arm. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

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

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

[0038] The B corrugated unit 4 comprises a first B valley portion 41, a first B peak portion 42, a second B valley portion 43, a second B peak portion 44 and a third B valley portion 45 connected in sequence; the top of the second B valley portion 43 is provided with a second elastic arm 51; the first B valley portion 41 and the third B valley portion 45 are both wound to form a second scroll portion 52; the first B peak portion 42 and the second B peak portion 44 are both formed with a second deformation space 53 with the underlying paper layer 12;

[0039] The bottom of the second A valley portion 23 and the bottom of the second B valley portion 43 are fixedly connected with the underlying paper layer 12 respectively; the top of the first elastic arm 31 and the top of the second elastic arm 51 are fixedly connected with the upper paper layer 11 respectively; the first scroll portion 32 is arranged in the second deformation space 53; the second scroll portion 52 is arranged 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 smaller than the elasticity of the first A peak portion 22, the elasticity of the second A peak portion 24, the elasticity of the first B peak portion 42 and the elasticity of the second B peak portion 44, and the elasticity of the first A peak portion 22, the elasticity of the second A peak portion 24, the elasticity of the first B peak portion 42 and the elasticity of the second B peak portion 44 are all smaller than the elasticity of the first scroll portion 32 and the elasticity of the second scroll portion 52.

[0040] Specifically, the multilayer structure of the toughened high-strength corrugated paper can be curled and deformed to absorb external impact force when the first scroll portion 32 and the second scroll portion 52 are subjected to pressure, and can form 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 until complete curling and deformation; when the corrugated paper is impacted, the first elastic arm 31 and the second elastic arm 51 play a first buffering role, 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 are deformed to play a second buffering role, and 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, 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 bottom of the second B peak portion 44 respectively, the bottom of the outer wall of the first scroll portion 32 abuts against the underlying 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 bottom of the second A peak portion 24 respectively, and the bottom of the outer wall of the second scroll portion 52 abuts against the underlying paper layer 12, so that the overall strength is high, and the first scroll portion 32 and the second scroll portion 52 play a third buffering role, thereby forming a gradient energy absorption when the corrugated paper is impacted by external impact, preventing the corrugated paper from being broken and damaged under external impact.

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

[0042] In the embodiment, the second spiral portion 52 at the first B trough portion 41 is movably arranged in the first deformation space 33 formed between the second A peak portion 24 and the underlying paper layer 12 of the adjacent upper A corrugation unit 2; and the second spiral portion 52 at the third B trough portion 45 is movably arranged in the first deformation space 33 formed between the first A peak portion 22 and the underlying paper layer 12 of the adjacent lower A corrugation unit 2. The above arrangement makes the first deformation space 33 on both sides of the A corrugation unit 2 be provided with the second spiral portion 52, thereby improving the toughness and strength of the whole toughened high-strength corrugated paper.

[0043] In the embodiment, the first spiral portion 32 at the first A trough portion 21 is movably arranged in the second deformation space 53 formed between the second A peak portion 24 and the underlying paper layer 12 of the adjacent upper B corrugation unit 4; and the first spiral portion 32 at the third A trough portion 25 is movably arranged in the second deformation space 53 formed between the first B peak portion 42 and the underlying paper layer 12 of the adjacent lower B corrugation unit 4. The above arrangement makes the second deformation space 53 on both sides of the B corrugation unit 4 be provided with the first spiral portion 32, thereby improving the toughness and strength of the whole toughened high-strength corrugated paper.

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

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

[0046] In the embodiment, the first spiral portion 32 and the second spiral portion 52 are staggered in the width direction. The above arrangement further makes the stress of the toughened high-strength corrugated paper uniform, and effectively improves the toughness and strength of the whole toughened high-strength corrugated paper.

[0047] In the embodiment, the first elastic arm 31 comprises a first S-shaped arm 71; the second elastic arm 51 comprises a second S-shaped arm 81; the bottom of the first S-shaped arm 71 is fixedly connected with the top of the second A trough part 23; the top of the first S-shaped arm 71 extends a first plane arm 72; the bottom of the second S-shaped arm 81 is fixedly connected with the top of the second B trough part 43; the top of the second S-shaped arm 81 extends a second plane arm 82; the first plane arm 72 and the second plane arm 82 are fixedly connected with the upper paper layer 11 respectively. Through the above setting, the first elastic arm 31 and the second elastic arm 51 have sufficient buffering capacity.

[0048] In the embodiment, the extending direction of the first plane arm 72 is opposite to the extending direction of the second plane arm 82. Through the above setting, the toughened high-strength corrugated paper can be further stressed uniformly, and the toughness and strength of the whole toughened high-strength corrugated paper can be effectively improved.

[0049] In the embodiment, the preparation method of the toughened high-strength corrugated paper with a multi-layer structure comprises the following steps:

[0050] S1, using a die cutting process to punch and cut the outer contour of the A corrugated unit 2, the outer contour of the B corrugated unit 4, the outer contour of the first elastic arm 31 and the outer contour of the second elastic arm 51 from the corrugated paper layer, so as to obtain a punched part; the two sides of the punched part are a first displacement slot 61 or a second displacement slot 62;

[0051] S2, through a glue spraying process, spraying EVA hot melt adhesive on the surface of the punched part to enhance the stiffness and toughness of the punched part, the dry film thickness of the EVA hot melt adhesive is controlled within the range of 35-55um, so as to obtain a toughened part;

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

[0053] S4, heating the friction-reducing glue-sprayed part to 85-95℃, so that the EVA hot melt adhesive softens, and adopting a mold pressing forming process to mold and form, and obtaining a mold pressing formed part after opening the mold and cooling; so as to form the first elastic arm 31, the second elastic arm 51, the first A wave peak part 22, the second A trough part 23, the second A wave peak part 24, the first B wave peak part 42, the second B trough part 43 and the second B wave peak part 44;

[0054] S5, heating the to-be-wound part of the molded part to 85-95 DEG C, softening the EVA hot melt adhesive, winding the to-be-wound part into a vortex shape by using a winding machine, forming a first vortex part 32 and a second vortex part 52, and obtaining an A corrugated unit 2 and a B corrugated unit 4 after cooling and setting;

[0055] S5, using a dispensing machine to apply adhesive to the A corrugated unit 2 and the B corrugated unit 4, specifically, applying adhesive to the top of the first elastic arm 31, the top of the second elastic arm 51, the bottom of the second A valley part 23, and the bottom of the second B valley part 43, then alternately arranging the A corrugated unit 2 and the B corrugated unit 4 to the lower paper layer 12, covering the upper paper layer 11 after completion, and obtaining a multi-layer structure of a toughened high-strength corrugated paper after the adhesive is dried.

[0056] The above is only a preferred embodiment of the present application, and for those skilled in the art, the specific implementation and application range can be changed according to the idea of the present application, and the content of the specification should not be understood as a limitation of the present application.

Claims

1. A multi-layered, toughened, high-strength corrugated paper, characterized in that: It includes a top paper layer, a bottom paper layer, and a corrugated paper layer; the corrugated paper layer is provided with multiple A-corrugated units and B-corrugated units alternately along the length direction; The A-corrugated unit includes a first A-valve portion, a first A-crest portion, a second A-valve portion, a second A-crest portion, and a third A-valve portion connected in sequence; the top of the second A-valve portion is provided with a first elastic arm; the first A-valve portion and the third A-valve portion are both wound to form a first spiral portion; a first deformation space is formed between the first A-crest portion and the lower paper layer and between the second A-crest portion and the lower paper layer; The B-corrugated unit includes a first B-trough section, a first B-peak section, a second B-trough section, a second B-peak section, and a third B-trough section connected in sequence; the top of the second B-trough section is provided with a second elastic arm; the first B-trough section and the third B-trough section are both wound to form a second spiral section; a second deformation space is formed between the first B-peak section and the lower paper layer and between the second B-peak section and the lower paper layer. The bottom of the second A trough and the bottom of the second B trough 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 spiral part is disposed in the second deformation space; the second spiral part is disposed in the first deformation space; Both the A-corrugated unit and the B-corrugated unit are made of elastic deformable material; The second spiral section at the first B trough is movably disposed in the first deformation space formed between the second A crest and the lower paper layer of the adjacent previous A corrugated unit; the second spiral section at the third B trough is movably disposed in the first deformation space formed between the first A crest and the lower paper layer of the adjacent next A corrugated unit. The first spiral portion at the first A trough is movably disposed in the second deformation space formed between the second A crest and the lower paper layer of the adjacent previous B corrugated unit; the first spiral portion at the third A trough is movably disposed in the second deformation space formed between the first B crest and the lower paper layer of the adjacent next B corrugated unit. 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 trough; 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; 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.

2. The multi-layered toughened high-strength corrugated paper according to claim 1, characterized in that: Both the first A-wave trough and the third A-wave trough are provided with multiple first vortex sections along the width direction; a first clearance groove communicating with the first deformation space is opened between two adjacent first vortex sections; the second vortex section enters the first deformation space through the first clearance groove.

3. The multi-layered toughened high-strength corrugated paper according to claim 1, characterized in that: Both the first B-wave trough and the third B-wave trough are provided with multiple second vortex sections along the width direction; a second clearance groove communicating with the second deformation space is opened between two adjacent second vortex sections; the first vortex section enters the second deformation space through the second clearance groove.

4. The multi-layered toughened high-strength corrugated paper according to claim 1, characterized in that: The first and second spiral sections are staggered in the width direction.

5. The multi-layered toughened high-strength corrugated paper according to claim 1, characterized in that: The extension direction of the first planar arm is opposite to the extension direction of the second planar arm.

6. A method for preparing a toughened high-strength corrugated paper with a multi-layer structure according to any one of claims 1-5, characterized in that: Includes the following steps: S1. The outer contours of corrugated unit A, corrugated unit B, first elastic arm and second elastic arm are punched out from the corrugated paper using a die-cutting process to obtain the punched part. S2. By spraying EVA hot melt adhesive onto the surface of the stamped part through a spraying process, a toughened part is obtained. S3. Apply PU adhesive to the areas of the toughened part that need to be wound using a spray adhesive process to obtain a friction-reducing spray adhesive part. S4. Heat the friction-reducing sprayed part to soften the EVA hot melt adhesive, and then use a compression molding process to perform compression molding. After opening the mold and cooling, the compression molded part is obtained. S5. Heat the part to be wound in the molding part to soften the EVA hot melt adhesive, and use a winding machine to wind the part to be wound into a spiral shape. After cooling and shaping, A corrugated unit and B corrugated unit are obtained. S6. Apply adhesive to corrugated units A and B using a dispensing machine. Alternately arrange corrugated units A and B on the lower paper layer. After completion, cover with the upper paper layer. After the adhesive dries, a multi-layered toughened high-strength corrugated paper is obtained.

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