CN113910688A - Manufacturing method of paper buffer type board with sandwich layer of bidirectional corrugated structure - Google Patents

Abstract

The invention discloses a method for manufacturing a paper buffer type board with a bidirectional corrugated sandwich layer. Manufacturing a flat upper panel and a flat lower panel; manufacturing a cellular paperboard consisting of a plurality of cellular planar structures, so that the cellular planar structures are closely connected in an array on the same paperboard; the cell planar structure is mainly formed by connecting four completely identical parallelogram boards which are arranged in a Chinese character tian shape through folding lines, and the cell paperboard is folded through the folding lines of the cell paperboard to form a sandwich layer formed by a plurality of cell three-dimensional structures; and respectively bonding the sandwich layer with the upper panel and the lower panel to form the paper buffer type panel. The board manufactured by the invention is easy to process and form, has wide structure height variation range and solves the problem of limited thickness of the single corrugated board; the unit mass bearing capacity and the buffering energy absorption characteristic are excellent, and the synchronous improvement of the mechanical property on the premise of improving the total thickness of the sandwich plate is realized.

Description

Manufacturing method of paper buffer type board with sandwich layer of bidirectional corrugated structure

Technical Field

The invention belongs to a method for manufacturing a paper board in the technical field of new materials, and particularly relates to a method for manufacturing a paper buffer type board with a bidirectional corrugated sandwich layer.

Background

Due to the requirement of environmental protection, the consumption and market demand of paper buffer type boards are always vigorous. At present, most of the paper buffer type boards on the market are three-layer corrugated boards, multi-layer corrugated boards or honeycomb boards. The three-layer corrugated board (also called single corrugated board) has relatively high compressive strength, but the buffer performance is poor, the corrugation height is limited, the A-type corrugation height is generally 4.6-4.9 mm, and the super-large type corrugation K height can only reach 6.6-7.0 mm; although the overall thickness of the structure of the multi-layer corrugated board can be increased by overlapping a plurality of corrugated core layers or bonding a plurality of single-layer corrugated boards, the processing process is complex, the interlayer bonding strength can also generate great influence on the mechanical property of the whole material, and the corrugated peaks and valleys of the adjacent corrugated core layers or the adjacent single corrugated boards cannot be perfectly aligned, so that the finally obtained multi-layer corrugated board has the problem of poor buffer performance but poor compressive strength, and more disadvantageously, the consumption of raw materials and adhesives is large in the manufacturing process of the multi-layer corrugated board, the cost is high, and the multi-layer corrugated board is not environment-friendly; the honeycomb paperboard is characterized by high flat-pressing strength, basically unlimited paperboard thickness, difficult processing, large glue amount for forming and bonding, large raw material consumption of the honeycomb paperboard per unit area, closed two ends of a honeycomb cell element, incapability of well dissipating humidity between plates and unsuitability for use in humid, cold storage and other environments.

The three-layer corrugated board and the honeycomb board are both of sandwich structures, namely, the three-layer corrugated board and the honeycomb board are formed by bonding an upper layer surface paper and a lower layer surface paper with a middle sandwich layer, and the three-layer corrugated board and the honeycomb board are different in structure of the middle sandwich layer. Due to the difference of the sandwich layer structure, the great difference of the mechanical property and the energy absorption buffer characteristic of the three-layer corrugated board and the honeycomb board is brought. It has also been demonstrated that it is feasible to redesign the sandwich structure of the sandwich structure to obtain new types of cushioning panels with different properties. How to improve the problems of poor buffer performance and limited corrugated height of the three-layer corrugated board by redesigning the core layer structure on the basis of the structural characteristics of the existing three-layer corrugated board, and provides a novel paper buffer type board, which is a new subject in the research field of buffer packaging materials.

Disclosure of Invention

The invention aims to provide a method for manufacturing a paper buffer type board with a bidirectional corrugated sandwich layer, aiming at solving the problems in the prior art, wherein the board has a sandwich structure, the sandwich layer is formed by simple cell element topology and has the characteristic of bidirectional corrugation, and the board is easy to process and form, has wide height variation range and has the bearing capacity and buffer energy absorption characteristics which are comparable to those of a single corrugated board.

In order to achieve the purpose, the invention adopts the technical scheme that:

s1, manufacturing a flat upper panel and a flat lower panel;

s2, manufacturing a cellular paperboard consisting of a plurality of cellular planar structures, and enabling the cellular planar structures to be closely arranged in an array on the same paperboard;

s3, folding the cell paperboard through the crease lines of the cell paperboard to form a sandwich layer consisting of a plurality of cell three-dimensional structures;

and S4, bonding the sandwich layer with the upper panel and the lower panel respectively to form the paper buffer board.

In S2, the cell planar structure is formed by four identical parallelogram boards arranged in a matrix shape connected by a fold line, the four parallelogram boards are all arranged on the same plane and are respectively divided into a cell first formation plane, a cell second formation plane, a cell third formation plane and a cell fourth formation plane according to quadrant distribution and sequencing, the cell first formation plane and the cell second formation plane, the cell second formation plane and the cell third formation plane, the cell third formation plane and the cell fourth formation plane, and the cell fourth formation plane and the cell first formation plane are connected by a fold line, and the whole formed by the cell second formation plane and the cell third formation plane is arranged in mirror symmetry with the whole formed by the cell first formation plane and the cell fourth formation plane;

the crease lines between the third formation plane of the cells and the fourth formation plane of the cells and the crease lines between the second formation plane of the cells and the first formation plane of the cells are collinear.

A first direction and a second direction which are vertically and orthogonally arranged are arranged on the plane of the planar structure of the cell;

between two adjacent cell plane structures along the first direction, the cell first constituting planes and the cell second constituting planes in one cell plane structure are respectively connected with the cell fourth constituting planes and the cell third constituting planes in another cell plane structure through crease lines;

between two adjacent cell plane structures in the second direction, the cell first formation planes in one cell plane structure and the cell second formation planes in the other cell plane structure are connected by a crease line, and the cell fourth formation planes in the one cell plane structure and the cell third formation planes in the other cell plane structure are connected by a crease line.

In S3, for each cell planar structure, folding the cell first configuration plane and the cell fourth configuration plane outward along the folding line between the cell first configuration plane and the cell fourth configuration plane, folding the cell second configuration plane and the cell third configuration plane outward along the folding line between the cell second configuration plane and the cell third configuration plane, folding the cell first configuration plane and the cell second configuration plane outward along the folding line between the cell first configuration plane and the cell second configuration plane, and folding the cell third configuration plane and the cell fourth configuration plane inward along the folding line between the cell third configuration plane and the cell fourth configuration plane; the folding processes of the four folding lines are mutually constrained and occur simultaneously, so that the planar structure of the cell element is folded into a spatial structure from a planar structure; and adjusting the dihedral angle between the four forming planes to make the acute angle between the folding line between the first forming plane of the cell and the fourth forming plane of the cell and the folding line between the second forming plane of the cell and the third forming plane of the cell be gamma, thus obtaining the three-dimensional structure of the cell.

In S3, after all the planar cell structures are folded to form the three-dimensional cell structure, the three-dimensional cell structures are two-dimensionally and tightly arranged in a planar array to form a sandwich layer.

In S4, an adhesive is coated on a folding line between the first cell constituting plane and the fourth cell constituting plane and a folding line between the second cell constituting plane and the third cell constituting plane of each three-dimensional cell structure, and then the three-dimensional cell structure is adhered to the lower surface of the upper panel;

coating adhesive on the right inclined edge of the first forming plane of each cell unit of the three-dimensional structure, the right inclined edge of the second forming plane of each cell unit, the left inclined edge of the third forming plane of each cell unit and the left inclined edge of the fourth forming plane of each cell unit, and then adhering the left inclined edge and the right inclined edge to the upper surface of the lower panel;

thereby obtaining the paper buffer type board with the bidirectional corrugated sandwich layer.

The invention is easy to process and form, has wide structure height variation range, can realize flexible customization of the thickness of the board by selecting the geometric parameters of the cell structure according to actual needs, and solves the problem that the thickness of the single corrugated board is limited; meanwhile, the unit mass bearing capacity and the buffering and energy absorbing characteristics of the board are superior to those of a three-layer corrugated board and a five-layer corrugated board with the same specification, and the synchronous improvement of the mechanical property on the premise of improving the total thickness of the sandwich board is realized.

Compared with the background art, the invention has the beneficial effects that:

1. the sandwich structure is simple, the sandwich layer is formed by simple cell element topology, has the characteristic of bidirectional corrugation, and is easy to process and form;

2. the height change range of the structure is wide, the flexible customization of the thickness of the board can be realized by selecting the geometric parameters of the cell structure according to actual needs, the structure is suitable for more occasions, and the problem of limited total height of the single corrugated board is solved;

3. the bearing capacity and the buffering energy absorption characteristic of unit mass are superior to those of three-layer corrugated boards and five-layer corrugated boards with the same specification, and the mechanical property is synchronously improved on the premise of improving the total thickness of the sandwich board;

4. the sandwich layer has the structural characteristic of bidirectional corrugation, the interior of the structure is communicated, moisture in the laminate can be discharged rapidly, and the influence of a humid environment on the structural performance is reduced.

The paper buffer type board with the bidirectional corrugated sandwich layer can be used as a buffer energy-absorbing liner and can also be used for manufacturing a high-strength cardboard box, is applied to the buffer packaging and logistics protection of products, and has the advantages of high strength, good buffer property, good stability of mechanical property, small consumption of raw materials, low cost and the like.

Drawings

Fig. 1 is a schematic structural view of a three-layered corrugated cardboard in the prior art.

Fig. 2 is a schematic structural view and a schematic three-dimensional structural view of a paper buffer board according to the present invention in a preferred embodiment.

Fig. 3 is a schematic plan view of a cell of a paper cushioning board according to the present invention in a preferred embodiment.

Fig. 4 is an out-of-plane compressive stress-strain curve of a paper cushioning sheet having a sandwich of bi-directional corrugations formed from a first type of cellular substructure, a second type of cellular substructure, and a third type of cellular substructure in accordance with a preferred embodiment.

Fig. 5 is a stress-strain curve per unit mass of a three-layer corrugated board and a paper buffer board with a sandwich layer of a bidirectional corrugated structure formed by a three-dimensional structure of a first type cell in a preferred embodiment under a flat pressing load.

Fig. 6 is a stress-strain curve per unit mass of a paper buffering board with a sandwich layer of a bidirectional corrugated structure and a five-layer corrugated board under a flat pressing load, which are formed by a three-dimensional structure of a first type of cell in the preferred embodiment.

In the figure, 11- (prior art) corrugated cardboard top panel, 12- (prior art) corrugated cardboard bottom panel, 13- (prior art) corrugated core layer;

21-upper panel, 22-lower panel, 23-sandwich layer;

30-cell vertex, 31-cell first constituting plane, 32-cell second constituting plane, 33-cell third constituting plane, 34-cell fourth constituting plane;

312-the fold line between the first constituent plane of the cell and the second constituent plane of the cell, 334-the fold line between the third constituent plane of the cell and the fourth constituent plane of the cell, 323-the fold line between the second constituent plane of the cell and the third constituent plane of the cell, 314-the fold line between the first constituent plane of the cell and the fourth constituent plane of the cell.

Detailed Description

The invention is further described below with reference to the figures and examples.

In specific implementation, the paper buffer type board is manufactured according to the following modes:

s1, manufacturing a flat upper panel 21 and a flat lower panel 22;

s2, manufacturing a cellular paperboard consisting of a plurality of cellular planar structures, and enabling the cellular planar structures to be closely arranged in an array on the same paperboard;

s3, folding the cell paperboard through the crease lines thereof to form a sandwich layer 23 consisting of a plurality of cell three-dimensional structures;

and S4, adhering the sandwich layer 23 to the upper panel 21 and the lower panel 22 respectively to form the paper buffer board.

In S2, the cell planar structure is mainly formed by four parallelogram boards with completely the same geometric parameters arranged in a grid shape connected by fold lines, and is similar to a paper plane shape, the four parallelogram boards are all arranged on the same plane and respectively divided into a cell first forming plane 31, a cell second forming plane 32, a cell third forming plane 33 and a cell fourth forming plane 34 according to quadrant distribution and sequencing, the cell first forming plane 31 and the cell second forming plane 32 are connected by fold lines, the cell second forming plane 32 and the cell third forming plane 33 are connected by fold lines, the cell third forming plane 33 and the cell fourth forming plane 34 are connected by fold lines, and the cell fourth forming plane 34 and the cell first forming plane 31 are provided with fold lines in advance; the cell second formation plane 32 and the cell third formation plane 33 are arranged in mirror symmetry with respect to the cell first formation plane 31 and the cell fourth formation plane 34;

the folding line 334 between the cell third constituting plane 33 and the cell fourth constituting plane 34 and the folding line 312 between the cell second constituting plane 32 and the cell first constituting plane 31 are on the same straight line, and the folding line 314 between the cell first constituting plane 31 and the cell fourth constituting plane 34 and the folding line 323 between the cell second constituting plane 32 and the cell third constituting plane 33 are not on the same straight line.

The planar structure of the cell is provided with a first direction and a second direction which are vertically and orthogonally arranged on the plane of the planar structure of the cell:

between two adjacent cell plane structures along the first direction, the cell first constituting plane 31 and the cell second constituting plane 32 in one cell plane structure are respectively connected with the cell third constituting plane 33 and the cell fourth constituting plane 34 in the other cell plane structure through crease lines, namely, crease lines are arranged in advance;

between two adjacent cell plane structures in the second direction, the cell first formation planes 31 in one cell plane structure and the cell second formation planes 32 in the other cell plane structure are connected by a crease line, and the cell fourth formation planes 34 in the one cell plane structure and the cell third formation planes 33 in the other cell plane structure are connected by a crease line, that is, a crease line is provided in advance.

As shown in the partially enlarged view of fig. 2 and fig. 3, in S3, for each cell plane structure, the cell first constituting plane 31 and the cell fourth constituting plane 34 are folded outward along the folding line 314 between the cell first constituting plane 31 and the cell fourth constituting plane 34, the cell second constituting plane 32 and the cell third constituting plane 33 are folded outward along the folding line 323 between the cell second constituting plane 32 and the cell third constituting plane 33, the cell first constituting plane 31 and the cell second constituting plane 32 are folded outward along the folding line 312 between the cell first constituting plane 31 and the cell second constituting plane 32, and the cell third constituting plane 33 and the cell fourth constituting plane 34 are folded inward along the folding line 334 between the cell third constituting plane 33 and the cell fourth constituting plane 34; the folding processes of the four folding lines are mutually constrained and occur simultaneously, so that the planar structure of the cell element is folded into a spatial structure from a planar structure; the dihedral angles between the four formation planes are adjusted so that the acute angle between the folding line 314 between the first formation plane of the cell and the fourth formation plane of the cell and the folding line 323 between the second formation plane of the cell and the third formation plane of the cell is γ, i.e., the folding angle of the three-dimensional structure of the cell is obtained.

The maximum value of the acute angle γ between the folding line 314 between the first constituent plane of the cell and the fourth constituent plane of the cell and the folding line 323 between the second constituent plane of the cell and the third constituent plane of the cell is twice the angle Δ between the adjacent two sides of the parallelogram board. Preferably, the cell three-dimensional structure with the angle ratio Δ/γ closer to 1 and the tan Δ cot (γ/2) larger has a larger pressure bearing capacity and an energy absorbing capacity.

In the resulting three-dimensional structure of the cell, the plane formed by the folding line 323 between the second constituting plane of the cell and the third constituting plane of the cell, and the folding line 314 between the fourth constituting plane of the cell and the first constituting plane of the cell is parallel to the upper panel 21, and the plane formed by the folding line 334 between the third constituting plane of the cell and the fourth constituting plane of the cell, and the folding line 312 between the first constituting plane of the cell and the second constituting plane of the cell is perpendicular to both the upper panel 21 and the lower panel 22.

In S3, after all the planar cell structures are folded to form a three-dimensional cell structure, the three-dimensional cell structures are two-dimensionally and tightly arrayed in a planar manner to form the sandwich layer 23.

As shown in fig. 2, in S4,

coating adhesive on a folding line 314 between the first constituting plane of the cell and the fourth constituting plane of the cell and a folding line 323 between the second constituting plane of the cell and the third constituting plane of the cell of each three-dimensional structure of the cell, and then adhering the adhesive to the lower surface of the upper panel 21;

the right inclined side of the cell first constituting plane 31, the right inclined side of the cell second constituting plane 32, the left inclined side of the cell third constituting plane 33 and the left inclined side of the cell fourth constituting plane 34 of each three-dimensional cell structure are coated with an adhesive and then bonded to the upper surface of the lower panel 22;

thereby obtaining the paper buffer type board with the bidirectional corrugated sandwich layer.

Therefore, the paper buffer type board manufactured by the invention comprises an upper panel 21, a lower panel 22 and a sandwich layer 23, wherein the sandwich layer 23 is arranged between the upper panel 21 and the lower panel 22 to form a sandwich structure, and the sandwich layer 23 is characterized by being in a bidirectional corrugation shape, namely, the sandwich layer 23 has corrugation sections in two mutually perpendicular directions, namely lines of the section in each direction of the sandwich layer 23 are both corrugation, and the corrugation is repeated in a V shape.

As shown in fig. 2, a partial enlarged view of fig. 2, and fig. 3, the sandwich layer 23 is obtained by closely packing a plurality of cell three-dimensional structures as a basic topology structure on a two-dimensional plane between the upper panel 21 and the lower panel 22;

the three-dimensional structure of the cell element is formed by folding a planar structure of the cell element according to a preset crease line; the cell plane structure mainly comprises four parallelogram plates with completely identical geometric parameters, wherein the four parallelogram plates are arranged in a field shape, the four parallelogram plates are respectively a cell first forming plane 31, a cell second forming plane 32, a cell third forming plane 33 and a cell fourth forming plane 34 according to the distribution and the sequence from the first quadrant to the fourth quadrant, and the whole formed by the cell second forming plane 32 and the cell third forming plane 33 and the whole formed by the cell first forming plane 31 and the cell fourth forming plane 34 are arranged in a mirror symmetry mode.

Each parallelogram plate is a parallelogram, wherein two opposite sides are horizontally arranged as horizontal sides with the side length of a, the other two opposite sides are non-horizontally arranged as inclined sides with the side length of b, and the included angle between the two adjacent sides is delta.

Preferably, in the parallelogram forming the three-dimensional structure of the cell element, the length range of the horizontal side a is 5-25 mm, the side length ratio a: b of the two adjacent sides is 0.25-2.5, and the included angle delta between the two adjacent sides is 30-80 degrees.

The cell first configuration plane 31 and the cell second configuration plane 32 are connected by a folding line 312 between the cell first configuration plane and the cell second configuration plane, the cell second configuration plane 32 and the cell third configuration plane 33 are connected by a folding line 323 between the cell second configuration plane and the cell third configuration plane, the cell third configuration plane 33 and the cell fourth configuration plane 34 are connected by a folding line 334 between the cell third configuration plane and the cell fourth configuration plane, and the cell fourth configuration plane 34 and the cell first configuration plane 31 are connected by a folding line 314 between the cell fourth configuration plane and the cell first configuration plane; the fold line 334 between the third and fourth cell formation planes is an inner fold line, the fold line 312 between the first and second cell formation planes, the fold line 323 between the second and third cell formation planes are connected, and the fold line 314 between the fourth cell formation plane and the first cell formation plane are outer fold lines; the cell vertex 30 is intersected by a fold line 334 between the cell third and fourth constituent planes, a fold line 312 between the cell first constituent plane and the cell second constituent plane, a fold line 323 between the cell second constituent plane and the cell third constituent plane, and a fold line 314 between the cell fourth constituent plane and the cell first constituent plane.

The connection of the folding line 323 between the cell second constituting plane and the cell third constituting plane, the plane constituted by the folding line 314 between the cell fourth constituting plane and the cell first constituting plane are parallel to the upper panel 21, the folding line 334 between the cell third constituting plane and the cell fourth constituting plane, the folding line 312 between the cell first constituting plane and the cell second constituting plane are inclined, and the plane constituted by the folding line 334 between the cell third constituting plane and the cell fourth constituting plane, the folding line 312 between the cell first constituting plane and the cell second constituting plane is perpendicular to both the upper panel 21 and the lower panel 22.

The three-dimensional structures of a plurality of cells are closely arrayed and connected, and a first direction and a second direction which are vertically and orthogonally arranged are arranged on a two-dimensional plane between the upper panel 21 and the lower panel 22:

between two adjacent cell three-dimensional structures along the first direction, the lower horizontal sides of the cell first constituting plane 31 and the cell second constituting plane 32 in one cell three-dimensional structure are respectively connected with the lower horizontal sides of the cell third constituting plane 33 and the cell fourth constituting plane 34 in the other cell three-dimensional structure by an inner folding line;

between two adjacent cell three-dimensional structures in the second direction, the outer oblique side of the cell first constituting plane 31 in one cell three-dimensional structure and the outer oblique side of the cell second constituting plane 32 in the other cell three-dimensional structure are connected by an inner fold line, and the outer oblique side of the cell fourth constituting plane 34 in the one cell three-dimensional structure and the outer oblique side of the cell third constituting plane 33 in the other cell three-dimensional structure are connected by an outer fold line.

In the specific implementation, all the three-dimensional structures of the cells are arranged on the same plate, and the three-dimensional structures are formed by folding paper on the same plate according to preset crease lines.

The deformation mode, the bearing capacity and the buffering energy absorption effect of the paper buffer type board are adjusted by adjusting the side length ratio of two adjacent sides of a single parallelogram in the three-dimensional structure of the cell element.

In the preferred embodiment, the three types of cell three-dimensional structures are a first type cell three-dimensional structure, a second type cell three-dimensional structure and a third type cell three-dimensional structure, and the three types of cell three-dimensional structures are mainly different in the length ratio of two adjacent sides of a parallelogram;

the side length ratio a to b of the parallelogram of the first type cell three-dimensional structure is equal to 1, so that the three-dimensional structure is suitable for occasions with higher requirements on bearing capacity and energy absorption, can absorb impact energy in a stable and controllable deformation mode, and provides protection for products; the side length ratio a to b of the parallelogram of the three-dimensional structure of the second type cell element is less than 1, so that the three-dimensional structure is suitable for occasions where secondary impact possibly suffered by products needs to be protected; the parallelogram side length ratio a to b of the three-dimensional structure of the third type of cell element is more than 1, so that the three-dimensional structure is suitable for occasions which have low requirements on bearing but need larger plate thickness during space filling.

The material of the sandwich layer 23 is a flat-plate-shaped polymer material such as kraft paper, corrugated medium paper, paperboard, micro corrugated board, dupont paper and the like.

The upper and lower panels 21 and 22 are made of kraft paper, cardboard, plywood, gypsum board, wood chips, or other flat materials, and the upper and lower panels 21 and 22 may be made of different materials.

The test examples of the present invention are as follows:

preferred embodiment 1:

the selected quantitative rate is 170g/m²Kraft paper as upper and lower panels with a basis weight of 170g/m²Corrugated paper is used as a material for the sandwich layer; the sandwich layer is formed by a first type of cell three-dimensional structure topology with the following basic structural characteristics: the three-dimensional structure of the cell element is composed of 4 parallelogram plates with the same geometric parameters, the two side lengths of the parallelogram are both 10mm, the included angle delta of the two side lengths is 60 degrees, the folding angle gamma is 80 degrees, and the three-dimensional structure is marked as sample No. 1. Sample # 1 had a thickness of 7.99 mm.

Preferred embodiment 2:

the selected quantitative rate is 170g/m²Kraft paper as upper and lower panels with a basis weight of 170g/m²Corrugated paper is used as a material for the sandwich layer; the sandwich layer is formed by the three-dimensional structure topology of a second type of cell units with the following basic structural characteristics: the three-dimensional structure of the cell element is composed of 4 parallelogram plates with the same geometric parameters, the two side lengths of the parallelogram are respectively 10mm and 20mm, the included angle delta between the two side lengths is 60 degrees, the folding angle gamma is 80 degrees, and the three-dimensional structure is marked as sample No. 2. Sample # 2 had a thickness of 7.99 mm.

Preferred embodiment 3:

the selected quantitative rate is 170g/m²Kraft paper as upper and lower panels with a basis weight of 170g/m²Corrugated paper is used as a material for the sandwich layer; the sandwich layer is formed by a third type of cell three-dimensional structure topology with the following basic structural characteristics: the three-dimensional structure of the cell element is composed of 4 parallelogram plates with the same geometric parameters, the two side lengths of the parallelogram are respectively 20mm and 10mm, the included angle delta between the two side lengths is 60 degrees, the folding angle gamma is 80 degrees, and the three-dimensional structure is marked as sample # 3. Sample # 3 had a thickness of 16.00 mm.

Preferred embodiment 4:

the selected quantitative rate is 170g/m²Kraft paper as upper and lower panels with a basis weight of 170g/m²Corrugated paper is used as a material for the sandwich layer; the sandwich layer is formed by a first type of cell three-dimensional structure topology with the following basic structural characteristics: the three-dimensional structure of the cell element consists of 4 parallelogram plates with the same geometric parametersThe length of each side is 10mm, the included angle delta between the two sides is 75 degrees, the folding angle gamma is 80 degrees, and the result is marked as sample No. 4. Sample # 4 had a thickness of 9.85 mm.

Two sets of reference samples were selected for comparison with the mechanical properties of corrugated board in the prior art. Reference sample C1# was a three-layer corrugated cardboard, with the upper and lower panels both having a basis weight of 170g/m²Kraft paper with corrugated core layer of a quantitative 170g/m²The thickness of a sample of the B-shaped corrugation made of corrugated paper is 3.06 mm; the reference sample C2# was a five-layer corrugated cardboard, with the upper and lower panels both having a basis weight of 170g/m²Kraft paper, the two corrugated medium layers have the weight of 170g/m²The middle layers made of corrugated paper are separated, and the quantitative weight of each of the two corrugated layers is 170g/m²B-type corrugation made of corrugated paper and quantitative 170g/m²C-shaped corrugation made of corrugated paper, and the thickness of the sample is 6.84 mm.

The sample No. 1, the sample No. 2, the sample No. 3, the sample No. 4, the reference sample C1 and the reference sample C2 were all pretreated at 23 ℃ under 50% RH for 48h, and then subjected to an out-of-plane compression test on an RGL-20A type electronic universal tester at a compression rate of 12 mm/min.

As shown in fig. 4, the three-dimensional structures of the first type cells, the three-dimensional structures of the second type cells, and the three-dimensional structures of the third type cells in the preferred embodiment form a paper cushioning-type board with a sandwich layer of a bi-directional corrugated structure, which has a significant difference in the out-of-plane compressive stress-strain curves. The sample No. 1 has higher platform stress and larger energy absorption capacity, is suitable for occasions with higher requirements on bearing capacity and energy absorption, can absorb impact energy in a stable and controllable deformation mode, and provides protection for products; the stress-strain curve of sample No. 2 has an obvious double-platform, and is suitable for occasions where secondary impact possibly suffered by a product needs to be protected; the stress-strain curve of sample # 3 has a lower initial peak load and a longer compression stroke, and is suitable for occasions requiring no high load bearing requirements but larger plate thickness during space filling. Therefore, in the preferred embodiment, the deformation modes and the mechanical properties of the paper buffer board with the bidirectional corrugated sandwich structure, which is made of three different types of cell three-dimensional structures, are remarkably different, so that the appropriate cell three-dimensional structure type can be selected according to needs, and the customization of the mechanical properties is realized.

As shown in fig. 5, the stress fluctuation of the reference sample C1# is very large, the entire stress-strain curve exhibits a large wave shape, and the stresses of the samples 1# and 4# are more even; although the initial peak stress of sample # 1 is lower than that of reference sample C1#, the plateau stress of sample # 1 is comparable to the average stress level of the crushing stage of reference sample C1#, and the total absorbed energy of sample # 1 is almost equal to that of reference sample C1 #. The initial peak stress, plateau stress and total absorbed energy of sample # 4 were all significantly higher than the reference sample C1 #. The above experimental results show that the paper buffer type board with the sandwich layer of the bidirectional corrugated structure not only has higher bearing performance and more stable deformation mode, but also has bearing capacity and buffer energy absorption performance which can be customized according to actual needs. As the experimental results demonstrate, merely changing the parallelogram angle Δ from 60 ° (sample # 1) to 75 ° (sample # 4) results in a 2.32 times increase in platform stress and a 1.98 times increase in total absorbed energy for the resulting structure. In addition, the thicknesses of the sample 1# and the sample 4# are respectively 7.99mm and 9.85mm, which are much higher than that of the reference sample C1# (the thickness is 3.06mm), so that the invention can solve the problems existing in the background technology, the height of the core layer is not limited any more, and the buffering performance and the bearing capacity are obviously improved.

As shown in fig. 6, not only the deformation mode of sample 1# is smoothly controllable, but also the initial peak stress, the plateau stress and the total absorbed energy are significantly higher than those of reference sample C2# and are close to twice those of reference sample C2#, which has obvious advantages. Also, the reference sample C2# requires 5 layers of base paper to achieve a thickness of 6.84mm, whereas sample 1# requires only 3 layers of base paper to achieve a thickness of 7.99 mm.

In current flute structure, single corrugated board's high variation range is limited, two corrugated board (five layers corrugated board promptly, two-layer flute core is separated by one deck intermediate level) or even three corrugated board (seven layers corrugated board promptly, three-layer flute core is separated by two-layer intermediate level) appear, compensate the limit of single corrugated board layer height and increase the side crushing strength of cardboard when being limited, but because several layers of flute hardly guarantee the flute crest and the trough position of each layer when piling up, the crest of the last layer flute of often appearing is pressed in the trough position of next layer flute, the flat crush strength just so is showing and has been reduced. Therefore, the contradiction between the increase of the thickness of the sandwich plate and the improvement of the out-of-plane mechanical property is formed, and the paper buffer type plate with the bidirectional corrugated sandwich structure provided by the invention becomes an ideal scheme for solving the contradiction.

Claims (6)

1. A method for manufacturing a paper buffer type board with a bidirectional corrugated sandwich layer is characterized by comprising the following steps:

s1, manufacturing a flat upper panel (21) and a flat lower panel (22);

s2, manufacturing a cellular paperboard consisting of a plurality of cellular planar structures, and enabling the cellular planar structures to be closely arranged in an array on the same paperboard;

s3, folding the cell paperboard through the crease lines thereof to form a sandwich layer (23) consisting of a plurality of cell three-dimensional structures;

and S4, adhering the sandwich layer (23) with the upper panel (21) and the lower panel (22) respectively to form the paper buffer board.

2. The method for making a paper cushioning board with a bidirectional corrugated sandwich layer as claimed in claim 1, wherein: in S2, the cell plane structure is formed by four identical parallelogram boards arranged in a matrix shape connected by a fold line, the four parallelogram boards are all arranged on the same plane and are respectively divided into a cell first forming plane (31), a cell second forming plane (32), a cell third forming plane (33) and a cell fourth forming plane (34) according to quadrant distribution and sequencing, the cell first forming plane (31) and the cell second forming plane (32), the cell second forming plane (32) and the cell third forming plane (33), the cell third forming plane (33) and the cell fourth forming plane (34), the cell fourth forming plane (34) and the cell first forming plane (31) are connected by fold lines, the whole formed by the cell second forming plane (32) and the cell third forming plane (33) and the whole formed by the cell first forming plane (31) and the cell fourth forming plane (34) are connected by fold lines The bodies are arranged in mirror symmetry;

the crease lines between the cell third formation plane (33) and the cell fourth formation plane (34) and the crease lines between the cell second formation plane (32) and the cell first formation plane (31) are collinear.

3. The method for making a paper buffering board with a bidirectional corrugated sandwich layer as claimed in claim 2, wherein: a first direction and a second direction which are vertically and orthogonally arranged are arranged on the plane of the planar structure of the cell;

between two adjacent cell plane structures along the first direction, a cell first constituting plane (31) and a cell second constituting plane (32) in one cell plane structure are respectively connected with a cell fourth constituting plane (34) and a cell third constituting plane (33) in the other cell plane structure through crease lines;

between two adjacent cell plane structures in the second direction, a cell first formation plane (31) in one cell plane structure and a cell second formation plane (32) in the other cell plane structure are connected by a crease line, and a cell fourth formation plane (34) in the one cell plane structure and a cell third formation plane (33) in the other cell plane structure are connected by a crease line.

4. The method for making a paper cushioning board with a bidirectional corrugated sandwich layer as claimed in claim 1, wherein: in S3, for each cell plane structure, the cell first constituting plane (31) and the cell fourth constituting plane (34) are folded outward along a folding line between the cell first constituting plane (31) and the cell fourth constituting plane (34), the cell second constituting plane (32) and the cell third constituting plane (33) are folded outward along a folding line between the cell second constituting plane (32) and the cell third constituting plane (33), the cell first constituting plane (31) and the cell second constituting plane (32) are folded outward along a folding line between the cell first constituting plane (31) and the cell second constituting plane (32), and the cell third constituting plane (33) and the cell fourth constituting plane (34) are folded inward along a folding line between the cell third constituting plane (33) and the cell fourth constituting plane (34); the folding processes of the four folding lines are mutually constrained and occur simultaneously, so that the planar structure of the cell element is folded into a spatial structure from a planar structure; and adjusting the dihedral angle between the four formation planes to make the acute angle between the folding line (314) between the first formation plane of the cell and the fourth formation plane of the cell and the folding line (323) between the second formation plane of the cell and the third formation plane of the cell be gamma, thereby obtaining the three-dimensional structure of the cell.

5. The method for making a paper cushioning board with a bidirectional corrugated sandwich layer as claimed in claim 1, wherein: in the step S3, after all the planar cell structures are folded to form the three-dimensional cell structure, the three-dimensional cell structures are two-dimensionally and tightly arrayed in a planar manner to form a sandwich layer (23).

6. The method for making a paper cushioning board with a bidirectional corrugated sandwich layer as claimed in claim 1, wherein: in the step S4, in the step S,

coating adhesive on a folding line (314) between a first cell forming plane (31) and a fourth cell forming plane (34) of each three-dimensional cell structure and a folding line (323) between a second cell forming plane (32) and a third cell forming plane (33), and then adhering the adhesive to the lower surface of the upper panel (21);

coating adhesive on the right inclined edge of the first component plane (31), the right inclined edge of the second component plane (32), the left inclined edge of the third component plane (33) and the left inclined edge of the fourth component plane (34) of each three-dimensional cell structure, and then adhering the two edges to the upper surface of the lower panel (22);

thereby obtaining the paper buffer type board with the bidirectional corrugated sandwich layer.

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