Honeycomb paperboard, its preparation equipment and methods

Abstract

This application provides a honeycomb paperboard, its preparation equipment, and its preparation method, belonging to the field of honeycomb paperboard technology. The honeycomb paperboard includes an upper layer paper, a lower layer paper, and a honeycomb core layer located between the upper layer paper and the lower layer paper. The honeycomb core layer is composed of multiple honeycomb units arranged in a row. At least some of the honeycomb units include sidewalls and flaps provided at both ends of the sidewalls, and the flaps are bonded to the surface of the upper layer paper or the lower layer paper.

Description

Technical Field

[0001] This application belongs to the field of honeycomb paperboard technology, specifically relating to a honeycomb paperboard and its preparation equipment and method. Background Technology

[0002] Honeycomb paperboard is a sandwich structure material made of two layers of linerboard and a honeycomb core layer bonded together with adhesive. Honeycomb paperboard has a high strength-to-weight ratio and a higher load-bearing capacity per unit area than corrugated paperboard, and is widely used in the packaging industry.

[0003] However, existing honeycomb paperboard generally has the following problems: First, the adhesive area between the face paper and the honeycomb core layer is limited, resulting in insufficient bonding strength. During the processing and use of cartons, the face paper and the honeycomb core layer are prone to peeling, affecting the performance. Second, the edge crush strength of honeycomb paperboard is low, and the difference in edge crush strength between the two directions is large, exhibiting anisotropy, which limits its application range.

[0004] The aforementioned problems affect the performance and application range of honeycomb paperboard, necessitating a honeycomb paperboard that can improve the bonding strength between the face paper and the honeycomb core layer, enhance edge crush strength, and reduce anisotropy. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a honeycomb paperboard, its preparation equipment, and its preparation method, aiming to at least partially solve the above-mentioned technical problems. The specific technical solution provided by this application is as follows.

[0006] As a first aspect of this application, a honeycomb paperboard is provided, comprising an upper layer paper, a lower layer paper, and a honeycomb core layer located between the upper layer paper and the lower layer paper, the honeycomb core layer being composed of a plurality of honeycomb units arranged in a manner; wherein at least some of the honeycomb units include sidewalls and flaps disposed at both ends of the sidewalls, the flaps being adhered to the surface of the upper layer paper or the lower layer paper.

[0007] As a second aspect of this application, an apparatus for preparing honeycomb paperboard as described above is provided, comprising:

[0008] Core paper supply device, used to supply core paper raw materials;

[0009] The first glue coating device is located downstream of the core paper supply device and includes a first glue coating roller. The surface of the first glue coating roller is provided with glue coating bosses for forming an adhesive portion on the surface of the core paper raw material. The adhesive portion includes a first adhesive portion and a second adhesive portion arranged alternately along the conveying direction of the core paper raw material.

[0010] A die-cutting device is located downstream of the first gluing device and includes a roller cutter. The surface of the roller cutter is circumferentially distributed with a first die and a second die. The first die and the second die are respectively used to die-cut a first core paper strip with folded ears and a second core paper strip on the core paper raw material. The first adhesive part is located on the first core paper strip and the second adhesive part is located on the second core paper strip.

[0011] The stacking and bonding device is located downstream of the die-cutting device and is used to heat and press the staggered first core paper strips and second core paper strips so that adjacent core paper strips are bonded together by the bonding part to form a core paper block.

[0012] The second gluing device, located downstream of the lamination and bonding device, includes a second gluing roller and a third gluing roller, used to bend and apply glue to the flaps on both sides of the core paper block, wherein the core paper block after gluing is stretched to form a honeycomb core layer.

[0013] A face paper laminating device, located downstream of the second adhesive coating device, is used to roll-laminate the honeycomb core layer with the upper and lower face papers; and

[0014] The drying and shaping device is located downstream of the face paper laminating device. It is used to heat, dry, flatten, and shape the honeycomb core layer after laminating the face paper to obtain honeycomb paperboard.

[0015] As a third aspect of this application, a method for preparing the honeycomb paperboard as described above is provided, comprising the following steps:

[0016] Step (1): Provide core paper raw materials;

[0017] Step (2): The core paper raw material is continuously fed into the first glue coating device, and an adhesive part is formed on the surface of the core paper raw material by the first glue coating roller. The adhesive part includes a first adhesive part and a second adhesive part that are alternately arranged along the conveying direction of the core paper raw material.

[0018] Step (3): The glued core paper raw material is continuously fed into the die-cutting device, and the first core paper strip and the second core paper strip with folded ears are continuously die-cut on the core paper raw material by the roller cutter, wherein the first adhesive part is located on the first core paper strip and the second adhesive part is located on the second core paper strip;

[0019] Step (4): After the die-cut first core paper strip and the second core paper strip are stacked alternately, they are fed into the stacking and bonding device. The adjacent core paper strips are bonded together by heating and pressurizing to form a core paper block.

[0020] Step (5): The core paper block is fed into the second gluing device. During the process of conveying the core paper block to the face paper composite device, it is subjected to traction force. The unbonded areas of each core paper strip unfold to form a honeycomb unit. The second and third gluing rollers of the second gluing device bend and apply glue to the folds on both sides of the core paper block respectively. The core paper block after gluing is stretched to form a honeycomb core layer.

[0021] Step (6): The honeycomb core layer is fed into the face paper composite device and rolled and laminated with the upper face paper and the lower face paper.

[0022] Step (7): The honeycomb core layer after the composite paper is sent into the drying and shaping device for heating, drying and flattening to obtain honeycomb paperboard.

[0023] Based on the above technical solution, the honeycomb paperboard, its preparation equipment, and its preparation method provided in this application have at least one of the following beneficial effects:

[0024] (1) In the embodiments of this application, the honeycomb paperboard provided in this application has folded ears at both ends of the sidewalls of the honeycomb unit, and the folded ears are bonded to the upper or lower face paper. Compared with the prior art, the folded ear structure increases the adhesive area between the honeycomb core layer and the face paper, changing the bonding method between the honeycomb core layer and the face paper from line contact or point contact to surface contact, thereby improving the bonding strength between the face paper and the honeycomb core layer and reducing the risk of peeling during carton processing and use. At the same time, the folded ear structure enhances the overall stability of the honeycomb core layer, helps to improve edge crush strength, reduces the strength difference in different directions, and improves the comprehensive mechanical properties of the honeycomb paperboard.

[0025] (2) In the embodiments of this application, the preparation equipment provided in this application is arranged sequentially along the conveying direction of the core paper raw material, including a first gluing device, a die-cutting device, a stacking and bonding device, a second gluing device, a face paper laminating device, and a drying and shaping device. The first gluing device forms alternating adhesive parts on the surface of the core paper raw material. The die-cutting device simultaneously die-cuts out the first core paper strip and the second core paper strip with folds. The stacking and bonding device stacks and bonds the core paper strips in an alternating manner. The second gluing device bends and applies glue to the folds. Finally, the face paper is laminated and dried and shaped. This equipment realizes continuous automated production of honeycomb paperboard. The processes are closely connected, which helps to improve production efficiency and product consistency, and reduce manual intervention and material loss.

[0026] (3) In the embodiments of this application, the preparation method provided in this application firstly forms alternating first and second adhesive portions on the surface of the core paper raw material using a first gluing device, then forms first and second core paper strips with folded ears through die cutting, and then stacks the two strips alternately and heats and presses them together to form a core paper block. During the conveying process, the core paper block naturally unfolds under the action of traction to form a honeycomb core layer, while the second gluing device bends and applies glue to the folded ears. Finally, it is laminated with the face paper and dried for shaping. This method does not require an additional stretching device, the process is continuous, and the connection between the folded ear bending and the lamination process is smooth, which is conducive to improving production efficiency and product qualification rate, and is suitable for industrial continuous production. Attached Figure Description

[0027] Figure 1 This is an exploded view of the honeycomb paperboard provided in an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the structure of the honeycomb core layer provided in an embodiment of this application;

[0029] Figure 3 A schematic diagram of the planar structure of the first core paper strip and the second core paper strip provided in the embodiments of this application;

[0030] Figure 4 A schematic diagram of the longitudinal cross-sectional structure of the first core paper strip and the second core paper strip provided in the embodiments of this application;

[0031] Figure 5 This is a schematic diagram of the structure of a honeycomb paperboard without folded ears provided in an embodiment of this application;

[0032] Figure 6 This is a schematic diagram of the adhesive coating and die-cutting section in the honeycomb paperboard preparation equipment provided in the embodiments of this application;

[0033] Figure 7 This is a schematic diagram of the structure of the face paper composite part in the honeycomb paperboard preparation equipment provided in the embodiments of this application;

[0034] Figure 8 A schematic diagram of the process layout for coating, die-cutting, and waste removal of core paper raw materials provided in an embodiment of this application;

[0035] Figure 9 This is a schematic diagram of the structure of the hob provided in the embodiments of this application;

[0036] Figure 10 This is a schematic diagram of the structure of the first coating roller provided in an embodiment of this application;

[0037] Figure 11 This is a schematic diagram of the structure of the laminated and bonded core paper block provided in the embodiments of this application;

[0038] Figure 12This is a flowchart illustrating the preparation method of honeycomb paperboard provided in an embodiment of this application.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1- Top layer paper;

[0041] 2- Lower layer paper;

[0042] 3-Honeycomb core layer; 31-First core paper strip; 32-Second core paper strip; 33-Folded ear; 311-First adhesive part; 321-Second adhesive part;

[0043] 100-core paper supply device;

[0044] 201 - First coating roller; 2011 - First coating boss; 2012 - Second coating boss;

[0045] 202 - Applying roller; 203 - Transfer roller;

[0046] 301 - Hob; 3011 - First die; 3012 - Second die;

[0047] 401 - Second coating roller; 402 - Third coating roller;

[0048] 501 - Upper layer paper pressing roll; 502 - Lower layer paper pressing roll; 503 - Upper layer paper supply roll; 504 - Lower layer paper supply roll. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0050] In realizing the concept of this application, it was discovered that the limited adhesive area between the face paper and the honeycomb core layer of existing honeycomb paperboards leads to insufficient bonding strength, making it prone to peeling during carton processing and use. Simultaneously, the edge crush strength of honeycomb paperboards is low, with significant differences between the edge crush strengths in the two directions, exhibiting anisotropy and limiting its application range. Based on this, this application provides a honeycomb paperboard, its preparation equipment, and its preparation method. By providing folded ears at both ends of the sidewall of each honeycomb unit and bonding and fixing the folded ears to the upper or lower face paper, the adhesive area between the honeycomb core layer and the face paper is increased, improving bonding strength, edge crush strength, and anisotropy.

[0051] Figure 1 This is an exploded structural diagram of the honeycomb paperboard provided in an embodiment of this application.

[0052] As a first aspect of this application, a honeycomb paperboard is provided, such as Figure 1As shown, the structure includes an upper layer 1, a lower layer 2, and a honeycomb core layer 3 located between the upper layer 1 and the lower layer 2. The honeycomb core layer 3 is composed of multiple honeycomb cells arranged in a row. At least some of the honeycomb cells include sidewalls and tabs 33 disposed at both ends of the sidewalls. The tabs 33 are adhered to the surface of the upper layer 1 or the lower layer 2. It should be noted that "at least some of the honeycomb cells" here can refer to some or all of the honeycomb cells.

[0053] In this embodiment, the honeycomb paperboard provided in this application has folded ears 33 at both ends of the sidewalls of the honeycomb units. The folded ears 33 are bonded to the upper face paper 1 or the lower face paper 2. The folded ear 33 structure increases the contact area between the honeycomb core layer 3 and the face paper, changing the bonding method from line contact to surface contact, thereby improving the bonding strength between the face paper and the honeycomb core layer 3. At the same time, the folded ear 33 structure enhances the overall stability of the honeycomb core layer 3, helps to improve edge crush strength and anisotropy, improves the comprehensive mechanical properties of the honeycomb paperboard, and meets the packaging requirements.

[0054] In some embodiments, each cell includes a sidewall and folded lugs 33 at both ends of the sidewall, thereby more effectively improving the bonding strength and ensuring the stability and edge crush resistance of the overall structure.

[0055] Figure 2 This is a schematic diagram of the structure of the honeycomb core layer provided in an embodiment of this application; Figure 3 A schematic diagram of the planar structure of the first core paper strip and the second core paper strip provided in the embodiments of this application; Figure 4 A schematic diagram of the longitudinal cross-sectional structure of the first core paper strip and the second core paper strip provided in the embodiments of this application.

[0056] In some embodiments, such as Figures 2-4 As shown, the honeycomb core layer 3 is composed of multiple core paper strips extending along a first direction; the multiple core paper strips include a first core paper strip 31 and a second core paper strip 32 arranged alternately along a second direction.

[0057] Specifically, the honeycomb core layer 3 is composed of multiple core paper strips stacked together. Each core paper strip extends along a first direction, which is the length direction of the core paper strip. Multiple core paper strips are stacked sequentially along a second direction, which is the stacking direction of the core paper strips. The first and second directions are perpendicular to each other and parallel to the extension plane of the honeycomb paperboard. The extension plane of the honeycomb paperboard refers to the plane in which the entire honeycomb paperboard lies. The core paper strips extend along the first direction and are stacked along the second direction within this plane, thus forming a regular arrangement of the honeycomb core layer 3 within the plane of the paperboard. "Alternating arrangement" means that along the second direction, one layer of first core paper strip 31 and one layer of second core paper strip 32 are stacked sequentially, meaning that adjacent layers of core paper strips are respectively the first core paper strip 31 and the second core paper strip 32. Through this alternating arrangement, the bonding positions of adjacent core paper strips can be staggered, providing a structural basis for the subsequent formation of honeycomb units.

[0058] Furthermore, the first core strip 31 is provided with a plurality of first adhesive portions 311 spaced apart along the first direction, and the second core strip 32 is provided with a plurality of second adhesive portions 321 spaced apart along the first direction. The first adhesive portions 311 and the second adhesive portions 321 are staggered in the second direction. "Staggered" means that the positions of the first adhesive portions 311 and the second adhesive portions 321 are staggered in the stacking direction and are not located on the same straight line. This arrangement disperses the adhesive points between adjacent core strips, avoids the concentration of adhesive positions, and facilitates the uniform unfolding of unbonded areas during stretching.

[0059] Furthermore, the first core paper strip 31 is connected to the adjacent second core paper strip 32 via a first adhesive portion 311, that is, the first adhesive portion 311 on the first core paper strip 31 is bonded to the corresponding area of ​​the adjacent second core paper strip 32. The second core paper strip 32 is connected to another adjacent first core paper strip 31 via a second adhesive portion 321, that is, the second adhesive portion 321 on the second core paper strip 32 is bonded to the corresponding area of ​​the other adjacent first core paper strip 31.

[0060] Because the first adhesive portion 311 and the second adhesive portion 321 are staggered in the second direction, the adhesive positions between adjacent core paper strips are alternately staggered. The unbonded areas between the core paper strips form honeycomb units. Unbonded areas refer to the areas on the core paper strips where no adhesive portion is provided. During manufacturing, after adjacent core paper strips are connected by adhesive portions, the unbonded areas are not fixed and unfold outwards when stretched, forming hexagonal latticework, i.e., honeycomb units. This structure allows the honeycomb core layer 3 to form a regular honeycomb structure after stretching, providing a foundation for subsequent lamination with the face paper.

[0061] In some embodiments, such as Figure 3 As shown, the flaps 33 are symmetrically arranged on both sides of the first core paper strip 31 and / or the second core paper strip 32.

[0062] In this embodiment, the symmetrical structure allows the flaps on the upper and lower sides of the first core strip 31 and the second core strip 32 to be bonded to the upper face liner 1 and the lower face liner 2 respectively after bending, forming a balanced bonding layout. This arrangement avoids stress concentration or warping deformation between the honeycomb core layer 3 and the face liner due to unilateral bonding, which is beneficial to improving the flatness and dimensional stability of the honeycomb paperboard. At the same time, the symmetrically arranged flaps 33 facilitate simultaneous bending and gluing during the manufacturing process, ensuring that the bending angle and glue application amount of the upper and lower flaps are consistent, thereby improving the composite quality of the honeycomb core layer 3 and the face liner and improving the overall mechanical properties of the honeycomb paperboard.

[0063] In some embodiments, such as Figure 2 As shown, the length L of the folded ear 33 is equal to the side wall length of the honeycomb cell; the relationship between the width W and the length L of the folded ear is: 4.5W≤L≤8W.

[0064] In this embodiment, the length of the flap 33 is equal to the sidewall length of the honeycomb unit, allowing the flap 33 to cover the area corresponding to the sidewall after bending, thereby forming a stable adhesive surface between the honeycomb core layer 3 and the face paper. Maintaining an appropriate ratio between the width and length of the flap 33 ensures sufficient adhesive area while avoiding material waste or interference during bending due to excessive flap length, and also prevents insufficient adhesive area due to excessively short flaps. This dimensional relationship facilitates the shaping of the flap 33 in subsequent bending, gluing, and lamination processes, improving the composite strength between the honeycomb core layer 3 and the face paper, and balancing material utilization and process feasibility.

[0065] In some embodiments, the width W of the flap 33 is 2~5mm, for example, it can be 2mm, 3mm, 4mm, or 5mm. When W is less than 2mm, the bonding area between the flap 33 and the face paper is limited, making it difficult to effectively improve the bonding strength between the honeycomb core layer 3 and the face paper. Furthermore, the flap 33 itself is not strong enough and is prone to tearing during bending and lamination. When W is greater than 5mm, the flap 33 is too large, increasing material consumption, increasing the force required for bending, and easily interfering with adjacent flaps, affecting the regularity of the honeycomb core layer 3 and the subsequent lamination quality. Controlling the width W of the flap 33 within the range of 2~5mm ensures sufficient bonding area while also considering material utilization and process feasibility, which is beneficial for improving the lamination strength and product consistency of the honeycomb paperboard.

[0066] Figure 5 This is a schematic diagram of the structure of a honeycomb paperboard without folded ears provided in an embodiment of this application. Furthermore, to verify the structural performance of the honeycomb paperboard of this application, simulation analysis methods are used to analyze, for example... Figure 5 The honeycomb cardboard without folded ears shown is similar to... Figure 1 The honeycomb paperboard with folded ears shown was compared in terms of edge crush strength and three-point bending stiffness. The comparison data is shown in Table 1.

[0067] Table 1. Performance simulation comparison results of honeycomb paperboard with and without folded ears.

[0068]

[0069] As shown in Table 1, simulation results demonstrate that the edge crush strength and three-point bending stiffness of the honeycomb paperboard in this application are significantly improved compared to traditional honeycomb paperboard in both the X and Y directions, with the improvement in edge crush strength in the Y direction being particularly significant. These simulation results indicate that this application effectively improves the edge crush strength and anisotropy of the honeycomb paperboard by incorporating the folded ear structure, thus verifying the effectiveness of the technical solution presented in this application.

[0070] Figure 6 This is a schematic diagram of the adhesive coating and die-cutting section in the honeycomb paperboard preparation equipment provided in the embodiments of this application; Figure 7 This is a schematic diagram of the structure of the face paper composite part in the honeycomb paperboard preparation equipment provided in the embodiments of this application; Figure 8 A schematic diagram of the process layout for coating, die-cutting, and waste removal of core paper raw materials provided in an embodiment of this application; Figure 9 This is a schematic diagram of the structure of the hob provided in the embodiments of this application; Figure 10 This is a schematic diagram of the structure of the first coating roller provided in an embodiment of this application; Figure 11 This is a schematic diagram of the structure of the core paper block after lamination and bonding, provided in an embodiment of this application.

[0071] As a second aspect of this application, an apparatus for preparing honeycomb paperboard as described above is provided, such as... Figures 6-11 As shown, it includes:

[0072] Core paper supply device 100, used to supply core paper raw materials;

[0073] The first glue coating device is located downstream of the core paper supply device 100 and includes a first glue coating roller 201. The surface of the first glue coating roller 201 is provided with glue coating bosses for forming an adhesive portion on the surface of the core paper raw material. The adhesive portion includes a first adhesive portion 311 and a second adhesive portion 321 arranged alternately along the conveying direction of the core paper raw material.

[0074] A die-cutting device is located downstream of the first gluing device and includes a roller cutter 301. The surface of the roller cutter is circumferentially spaced with a first die 3011 and a second die 3012. The first die 3011 and the second die 3012 are respectively used to die-cut a first core paper strip 31 and a second core paper strip 32 with folded ears 33 from the core paper raw material. The first adhesive part 311 is located on the first core paper strip 31 and the second adhesive part 321 is located on the second core paper strip 32.

[0075] The stacking and bonding device is located downstream of the die-cutting device and is used to heat and press the interlaced first core paper strip 31 and second core paper strip 32 so that adjacent core paper strips are bonded together by the bonding part to form a core paper block.

[0076] The second gluing device is located downstream of the lamination and bonding device and includes a second gluing roller 401 and a third gluing roller 102. It is used to bend and glu the flaps 33 on both sides of the core paper block respectively, wherein the core paper block after gluing is stretched to form a honeycomb core layer 3.

[0077] A face paper laminating device, located downstream of the second adhesive coating device, is used to roll-laminate the honeycomb core layer with the upper and lower face papers; and

[0078] The drying and shaping device is located downstream of the face paper laminating device. It is used to heat, dry, flatten, and shape the honeycomb core layer after laminating the face paper to obtain honeycomb paperboard.

[0079] In this embodiment, the equipment for preparing honeycomb paperboard provided in this application is arranged sequentially along the core paper raw material conveying direction as a core paper supply device, a first gluing device, a die-cutting device, a stacking and bonding device, a second gluing device, a face paper laminating device, and a drying and shaping device. The first gluing device forms alternating first bonding portions 311 and second bonding portions 321 on the surface of the core paper raw material. The die-cutting device simultaneously die-cuts first core paper strips 31 and second core paper strips 32 with folded ears 33. After stacking and bonding, the second gluing device bends and glues the folded ears 33, and the core paper blocks are unfolded to form a honeycomb core layer by means of conveying traction. Finally, the face paper is laminated and dried for shaping. This equipment realizes continuous automated production of honeycomb paperboard, with tight connections between each process, which is beneficial to improving production efficiency and product consistency.

[0080] In some embodiments, the die-cutting apparatus further includes an elastic member (not shown) disposed on both sides of the cutting edges of the first die 3011 and the second die 3012. When the roller 301 die-cuts the core paper material, the elastic member is compressed. After die-cutting, the elastic member springs back to eject the die-cut material from the roller 301. The "die-cut material" includes the die-cut first core paper strip 31, the second core paper strip 32, and the waste generated during die-cutting.

[0081] For example, the elastic component can be a spring, rubber block, silicone block, polyurethane block or sponge block or other component with compression and rebound properties, as long as it can be compressed during die cutting by the roller cutter 301 and rebound after die cutting to eject the material from the roller cutter 301. This application does not limit the specific material and structural form of the elastic component.

[0082] In this embodiment, elastic components are provided on both sides of the cutting edges of the first die 3011 and the second die 3012. These components compress during die cutting and spring back after cutting, ejecting the die-cut first core paper strip 31, second core paper strip 32, and waste material from the roller cutter 301. This structure effectively prevents material from getting stuck in the die, ensuring the continuity of the die cutting and waste removal processes, reducing downtime for cleaning, and improving production efficiency. Simultaneously, the elastic components do not affect die-cutting accuracy and help maintain the neatness of the core paper strip edges, providing a reliable foundation for subsequent lamination, bonding, and stretching.

[0083] In some embodiments, the rotational speeds of the first coating roller 201 and the roller 301 are synchronized, and the distance is configured such that when the core paper material is conveyed to the position of the roller 301, the positions of the first core paper strip 31 and the first die 3011 correspond, and the positions of the second core paper strip 32 and the second die 3012 correspond.

[0084] In this embodiment, by synchronizing the rotation speed and position of the first coating roller 201 and the die cutter 301, precise alignment of the coating pattern and the die-cutting pattern is ensured during continuous production. Consequently, the first adhesive portion 311 is accurately formed on the first core paper strip 31, and the second adhesive portion 321 is accurately formed on the second core paper strip 32, avoiding misalignment or missed coating due to misalignment. This arrangement ensures reliable bonding between adjacent core paper strips during subsequent lamination and bonding, and the unbonded areas unfold into honeycomb units according to a predetermined shape, which helps improve product dimensional consistency and production pass rate, and ensures the stability of continuous production.

[0085] In some embodiments, such as Figure 9 As shown, the blade contours of the first die 3011 and the second die 3012 are complementary to each other, so as to form symmetrically distributed folds 33 on both sides of the die-cut first core paper strip 31 and / or second core paper strip 32.

[0086] In this embodiment, because the first die 3011 and the second die 3012 adopt complementary contour designs, the resulting core paper strips have folded ears 33 on both sides. This structure allows both sides of each core paper strip to participate in the bonding with the face paper, thereby forming a balanced bonding layout between the honeycomb core layer 3 and the face paper, avoiding insufficient bonding area or uneven stress caused by the folded ears 33 being distributed on one side. At the same time, the folded ears 33 on both sides help improve the structural stability of the core paper strips during stacking, stretching, and lamination processes, thereby improving the edge crush strength and overall consistency of the honeycomb paperboard.

[0087] In some embodiments, such as Figure 7As shown, the second glue-applying roller 401 and the third glue-applying roller 402 are respectively disposed on both sides of the core paper block, and the axes of the second glue-applying roller 401 and the third glue-applying roller 402 are perpendicular to the conveying direction of the core paper block. The second glue-applying roller 401 and the third glue-applying roller 402 are configured to be independently positional relative to the core paper block, so that the folded ear 33 can be bent to a preset angle and then bonded to the corresponding face paper.

[0088] In this embodiment, the second glue-applying roller 401 and the third glue-applying roller 402 are respectively disposed on both sides of the core paper block, with their axes perpendicular to the conveying direction. Their positions can be adjusted independently, thereby controlling the bending angles of the upper and lower flaps 33 on the core paper block. By adjusting the positions of the second glue-applying roller 401 and the third glue-applying roller 402, the flaps 33 can be bent to appropriate angles and bonded to the corresponding face paper according to different specifications or process requirements, ensuring consistent bonding between the upper and lower flaps 33 and avoiding poor bonding or wrinkling of the face paper due to improper bending angles. This arrangement improves the equipment's adaptability to different products and helps ensure composite quality and the stability of continuous production.

[0089] In some embodiments, such as Figure 10 As shown, the coating bosses provided on the surface of the first coating roller 201 include a first coating boss 2011 and a second coating boss 2012, wherein the first coating boss 2011 is used to form a first adhesive portion 311 and the second coating boss 2012 is used to form a second adhesive portion 321.

[0090] In this embodiment, since the surface of the first coating roller 201 is simultaneously provided with a first coating boss 2011 and a second coating boss 2012, the first adhesive portion 311 and the second adhesive portion 321 can be formed simultaneously in one coating action, eliminating the need for two separate coating mechanisms, thus simplifying the equipment structure and improving coating efficiency. The first adhesive portion 311 and the second adhesive portion 321 correspond to the subsequent first core paper strip 31 and the second core paper strip 32, respectively, ensuring accurate bonding positions when adjacent core paper strips are stacked and maintaining an alternating distribution. This facilitates the uniform unfolding of unbonded areas during stretching to form honeycomb units. This design reduces the alignment difficulty between coating and die-cutting, helping to improve the dimensional consistency of the honeycomb core layer and the stability of continuous production.

[0091] In some embodiments, such as Figure 6 As shown, the first coating device also includes an applicator roller 202 and a transfer roller 203. The applicator roller 202 is used to pick up adhesive from the glue tank. The transfer roller 203 is disposed between the applicator roller 202 and the first coating roller 201 and is used to transfer the adhesive on the applicator roller 202 to the coating boss of the first coating roller 201, and then the coating boss applies the adhesive to the surface of the core paper raw material to form an adhesive portion.

[0092] In this embodiment, through the cooperation of the gluing roller 202 and the transfer roller 203, the adhesive is uniformly transferred to the gluing boss of the first gluing roller 201 after two stages of transfer, ensuring a stable amount of adhesive and a clear gluing pattern, thus avoiding uneven coating or adhesive overflow that may occur when applying adhesive directly. This structure helps to ensure the dimensional consistency of the first adhesive part 311 and the second adhesive part 321, thereby ensuring reliable bonding of adjacent core paper strips in subsequent lamination and bonding. The unbonded areas unfold into honeycomb units according to a predetermined shape, which is beneficial to improving product dimensional consistency and the stability of continuous production.

[0093] In some embodiments, the adhesive used in the first and second gluing devices can be selected according to actual process conditions and bonding requirements. Preferably, the adhesive is starch adhesive. Starch adhesive has the advantages of wide availability of raw materials, low cost, and good environmental friendliness, and it has good compatibility with paper materials, thus meeting the bonding requirements between core paper strips and between the flaps and the face paper.

[0094] In some embodiments, such as Figure 7 As shown, the face paper laminating device includes an upper face paper rolling roller 501, a lower face paper rolling roller 502, an upper face paper supply roller 503, and a lower face paper supply roller 504. The upper face paper supply roller 503 and the lower face paper supply roller 504 are respectively disposed above and below the honeycomb core layer, and are used to supply upper face paper 1 and lower face paper 2, respectively. The upper face paper rolling roller 501 and the lower face paper rolling roller 502 are respectively disposed on the upper and lower sides of the honeycomb core layer 3, and are used to roll and laminate the upper face paper 1 and the lower face paper 2 with the honeycomb core layer 3. Specifically, the honeycomb core layer 3, after being bent and coated with glue by the second glue coating device, is conveyed to the face paper composite device. The upper face paper supply roller 503 and the lower face paper supply roller 504 release the upper face paper 1 and the lower face paper 2 respectively, so that they cover the upper and lower surfaces of the honeycomb core layer 3 respectively. Then, the upper face paper rolling roller 501 and the lower face paper rolling roller 502 apply pressure to the stacked material, so that the fold 33 is tightly bonded to the corresponding face paper, thus completing the composite of the face paper and the honeycomb core layer 3.

[0095] In this embodiment, the continuous rolling lamination of the face paper and the honeycomb core layer 3 can be achieved through the cooperation of the upper face paper supply roller 503, the lower face paper supply roller 504, the upper face paper rolling roller 501, and the lower face paper rolling roller 502. During the rolling process, the folded ears 33 and the face paper are evenly stressed and tightly bonded, which helps to reduce lamination defects such as bubbles and delamination, and ensures the bonding quality between the honeycomb core layer 3 and the face paper. This structure can be connected with the preceding gluing and bending processes, adapting to continuous production and improving the lamination efficiency and product consistency of the honeycomb paperboard.

[0096] Figure 12 This is a flowchart illustrating the preparation method of honeycomb paperboard provided in an embodiment of this application.

[0097] As a third aspect of this application, a method for preparing the honeycomb paperboard as described above is provided, such as... Figure 12 As shown, it includes steps S1-S7.

[0098] Step S1: Provide core paper raw materials.

[0099] Step S2: The core paper raw material is continuously fed into the first glue coating device, and an adhesive part is formed on the surface of the core paper raw material by the first glue coating roller. The adhesive part includes a first adhesive part 311 and a second adhesive part 321 that are alternately arranged along the conveying direction of the core paper raw material.

[0100] Step S3: The coated core paper raw material is continuously fed into the die-cutting device, and the first core paper strip 31 and the second core paper strip 32 with folded ears 33 are continuously die-cut on the core paper raw material by the roller cutter 301. The first adhesive part 311 is located on the first core paper strip 31, and the second adhesive part 321 is located on the second core paper strip 32.

[0101] Step S4: The die-cut first core paper strip 31 and second core paper strip 32 are stacked alternately and fed into the stacking and bonding device. The adjacent core paper strips are bonded together by heating and pressing to form a core paper block.

[0102] Step S5: The core paper block is fed into the second gluing device. During the process of conveying the core paper block to the face paper composite device, it is subjected to traction force. The unbonded areas of each core paper strip unfold to form a honeycomb unit. The second gluing roller 401 and the third gluing roller 402 of the second gluing device bend and apply glue to the folds 33 located on both sides of the core paper block, respectively. The core paper block after gluing is stretched to form a honeycomb core layer 3.

[0103] Step S6: The honeycomb core layer 3 is fed into the face paper composite device and rolled and laminated with the upper face paper 1 and the lower face paper 2.

[0104] Step S7: The honeycomb core layer 3 after the composite paper is sent into the drying and shaping device for heating, drying and flattening to obtain honeycomb paperboard.

[0105] In this embodiment, adhesive is first applied to form staggered adhesive sections, then first core paper strips 31 and 32 with folded ears 33 are die-cut, and then they are stacked alternately and heated to form core paper blocks. During the conveying process, the core paper blocks are naturally unfolded under traction to form the honeycomb core layer 3, while the folded ears 33 are bent and glued. Then, they are rolled and laminated with the upper and lower face sheets, and dried and shaped to obtain honeycomb paperboard. The processes in this method are closely connected, enabling continuous production. The folded ears 33 form a surface contact bond with the face sheets, increasing the bonding area, which is beneficial to improving the composite strength, edge crush strength and anisotropy, and ensuring product consistency.

[0106] In summary, this application provides a honeycomb paperboard, its preparation equipment, and its preparation method. Addressing the problem of easy peeling between the face paper and the honeycomb core layer in existing honeycomb paperboards due to insufficient adhesive area, this application provides folded ears on both sides of the core paper strip. Through processes such as gluing, die-cutting, stacking and bonding, bending and gluing the folded ears, and face paper lamination, the folded ears are bonded and fixed to the upper or lower face paper. This solution increases the adhesive area between the honeycomb core layer and the face paper, improves the bonding strength, effectively improves the problem of easy face paper delamination, and also helps to improve the edge crush strength and bending resistance of the honeycomb paperboard, improves anisotropy, and meets packaging requirements.

[0107] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above descriptions are merely specific embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A honeycomb paperboard, characterized in that, include: The upper layer paper, the lower layer paper, and the honeycomb core layer located between the upper layer paper and the lower layer paper, wherein the honeycomb core layer is composed of a plurality of honeycomb units arranged together; At least some of the honeycomb cells include sidewalls and tabs disposed at both ends of the sidewalls, the tabs being adhered to the surface of the upper or lower face paper.

2. The honeycomb paperboard according to claim 1, characterized in that, The honeycomb core layer is formed by stacking multiple strips of core paper extending along a first direction; The plurality of core paper strips include first core paper strips and second core paper strips arranged alternately along a second direction; The first core paper strip has a plurality of first adhesive portions spaced apart along the first direction, and the second core paper strip has a plurality of second adhesive portions spaced apart along the first direction, with the first adhesive portions and the second adhesive portions being staggered in the second direction; The first core paper strip is connected to the adjacent second core paper strip through the first adhesive portion, and the second core paper strip is connected to another adjacent first core paper strip through the second adhesive portion. The unadhesive areas between the core paper strips form the honeycomb unit. Wherein, the first direction and the second direction are perpendicular to each other.

3. The honeycomb paperboard according to claim 2, characterized in that, The flaps are symmetrically arranged on both sides of the first core paper strip and / or the second core paper strip.

4. The honeycomb paperboard according to claim 1, characterized in that, The length L of the folded ear is equal to the side wall length of the honeycomb unit; The relationship between the width W and length L of the folded ear is: 4.5W≤L≤8W.

5. A device for preparing honeycomb paperboard as described in any one of claims 1-4, characterized in that, include: Core paper supply device, used to supply core paper raw materials; The first glue-coating device is located downstream of the core paper supply device and includes a first glue-coating roller. The surface of the first glue-coating roller is provided with glue-coating protrusions for forming an adhesive portion on the surface of the core paper raw material. The adhesive portion includes a first adhesive portion and a second adhesive portion arranged alternately along the conveying direction of the core paper raw material. A die-cutting device, located downstream of the first gluing device, includes a roller cutter. The surface of the roller cutter is circumferentially distributed with a first die and a second die. The first die and the second die are respectively used to die-cut a first core paper strip with folded ears and a second core paper strip on the core paper raw material. The first adhesive part is located on the first core paper strip and the second adhesive part is located on the second core paper strip. A stacking and bonding device is located downstream of the die-cutting device and is used to heat and press the first core paper strips and the second core paper strips that are stacked in an alternating manner, so that adjacent core paper strips are bonded together through the bonding part to form a core paper block. The second gluing device is located downstream of the lamination and bonding device and includes a second gluing roller and a third gluing roller. It is used to bend and apply glue to the flaps on both sides of the core paper block, and the core paper block after gluing is stretched to form a honeycomb core layer. A paper laminating device is located downstream of the second adhesive coating device and is used to roll-laminate the honeycomb core layer with the upper and lower face sheets. as well as A drying and shaping device is located downstream of the face paper laminating device. It is used to heat, dry, and flatten the honeycomb core layer after laminating the face paper to obtain honeycomb paperboard.

6. The preparation apparatus according to claim 5, characterized in that, The die-cutting device further includes an elastic component disposed on both sides of the blades of the first die and the second die. The elastic component is configured to be compressed when the roller cuts the core paper material and to spring back after die-cutting to eject the die-cut material from the roller.

7. The preparation apparatus according to claim 5, characterized in that, The rotational speeds of the first coating roller and the cutter are synchronized, and the distance is configured such that when the core paper raw material is conveyed to the position of the cutter, the position of the first core paper strip corresponds to the position of the first die, and the position of the second core paper strip corresponds to the position of the second die.

8. The preparation apparatus according to claim 5, characterized in that, The blade contours of the first die and the second die are complementary to each other, so as to form symmetrically distributed folds on both sides of the die-cut first core paper strip and / or second core paper strip.

9. The preparation apparatus according to claim 5, characterized in that, The second glue-applying roller and the third glue-applying roller are respectively disposed on both sides of the core paper block, and the axes of the second glue-applying roller and the third glue-applying roller are both perpendicular to the conveying direction of the core paper block; The second and third glue-applying rollers are configured to be independently positional relative to the core paper block, so that the folded ear can be bent to a preset angle and then bonded to the corresponding face paper.

10. A method for preparing honeycomb paperboard as described in any one of claims 1-4, characterized in that, Includes the following steps: Step (1): Provide core paper raw materials; Step (2): The core paper raw material is continuously fed into the first glue coating device, and an adhesive part is formed on the surface of the core paper raw material by the first glue coating roller. The adhesive part includes a first adhesive part and a second adhesive part that are alternately arranged along the conveying direction of the core paper raw material. Step (3): The coated core paper material is continuously fed into the die-cutting device, and the first core paper strip and the second core paper strip with folded ears are continuously die-cut on the core paper material by the roller cutter, wherein the first adhesive part is located on the first core paper strip and the second adhesive part is located on the second core paper strip; Step (4): After the die-cut first core paper strip and the second core paper strip are stacked alternately, they are fed into the stacking and bonding device. The adjacent core paper strips are bonded together by heating and pressurizing to form a core paper block. Step (5): The core paper block is fed into the second gluing device. During the process of conveying the core paper block to the face paper composite device, it is subjected to traction force. The unbonded areas of each core paper strip unfold to form a honeycomb unit. The second and third gluing rollers of the second gluing device are used to bend and apply glue to the folds on both sides of the core paper block respectively. The core paper block after gluing is stretched to form a honeycomb core layer. Step (6): The honeycomb core layer is fed into the face paper composite device and rolled and laminated with the upper face paper and the lower face paper; Step (7): The honeycomb core layer after the composite paper is sent into the drying and shaping device for heating, drying and flattening to obtain honeycomb paperboard.

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