A laminating machine for composite paperboard and a working method thereof

Abstract

This invention provides a laminating machine for composite paperboard and its working method, relating to the field of paperboard processing technology. The machine includes a frame with a waterproof paper layer conveying station and a paperboard conveying station along the vertical direction. The waterproof paper layer conveying station includes a waterproof paper layer servo conveyor belt and a waterproof paper layer guide frame. A gluing and pressing station is provided along the horizontal direction of the frame. The gluing and pressing station includes a pre-pressing flat roller group, a pressing roller group, a gluing structure, and a linkage mechanism. The linkage mechanism is installed at both ends of the upper pre-pressing flat roller. The gluing structure is located on the frame and is connected to the linkage mechanism, performing lifting and lowering actions relative to the rotating upper pre-pressing flat roller. The gluing structure stores glue internally, and a glue outlet is formed on its downward-facing side. The pressing roller group is located on one side of the waterproof paper layer guide frame. Through the working method, this invention obtains a paperboard with a waterproof paper layer laminated to its surface. When applied in packaging, transportation, and other scenarios, it can provide waterproofing, moisture resistance, and increased paperboard strength.

Description

Technical Field

[0001] This invention relates to the field of paperboard processing technology, specifically to a laminating machine for composite paperboard and its working method. Background Technology

[0002] For multi-layered composite paperboard, a laminator is a device specifically designed to bond paperboard with other layers besides the paperboard. The paperboard includes corrugated cardboard, honeycomb cardboard, foam cardboard, etc., and the layers include waterproof paper layers, fire-retardant paper layers, etc. For composite paperboard combining paperboard and a waterproof paper layer, the waterproof paper layer is typically a paper layer with a plastic film such as polyethylene or polypropylene laminated to its surface, creating a composite material with the properties of both paper and plastic. This type of machine is commonly used to produce packaging, advertising materials, signage, menus, and other products with waterproof, wear-resistant, and easy-to-clean properties.

[0003] The aforementioned presses typically include a feeding system, a conveying system, an adhesive coating and bonding system, a compaction system, and a discharge system in terms of hardware, and may even include a cutting system. In terms of software, they generally include a positioning system, a PLC control system, an operating interface, and safety devices. These components work together to enable the paper-plastic composite press to efficiently bond paperboard and waterproof plastic paper layers together, creating composite materials with the properties of both paper and plastic to meet the needs of different applications.

[0004] In existing presses, the waterproof paper layer and the cardboard are conveyed independently from top and bottom during the feeding, gluing, bonding, and compaction processes. After the cardboard is glued, the waterproof paper layer and the cardboard with glue on its upper surface are then conveyed together. When conveyed independently, for the cardboard, as... Figure 1 As shown, firstly, the pre-pressing operation is completed by passing through the gap between a set of pre-pressing rollers A. Secondly, the gluing operation is completed by passing through the gap between a set of gluing rollers B. For the waterproof paper layer, it is first conveyed to an inclined guide frame C, and then transferred by the guide frame C to the top of the glued cardboard. During the conveying together, the waterproof paper layer and the cardboard, which are arranged vertically, are sequentially pressed by two sets of pressing rollers D, which promotes the adhesion of the waterproof paper layer to the surface of the cardboard under the adhesive effect of the glue.

[0005] Among them, such as Figure 2As shown, the coating roller assembly includes two upper coating rollers and two lower coating rollers. The space between the two upper coating rollers is used to store liquid glue, and there is a certain gap between the two upper coating rollers to allow glue to leak from the cardboard passing through the coating roller assembly. The distances between the two lower coating rollers and their corresponding upper coating rollers are different, with the distance between the upper and lower coating rollers farther from the pre-press flat roller assembly being smaller. During the coating operation, the cardboard first passes between the upper and lower coating rollers with a larger gap, and the pre-stored liquid glue falls from the gap onto the upper surface of the cardboard. At this time, the glue is still in a state of accumulation. When the cardboard passes between the upper and lower coating rollers with a smaller gap, the roller surface of the upper coating roller contacts the glue on the upper surface of the cardboard, and the lower coating roller holds the cardboard in place. The upper and lower coating rollers work together to smooth the glue on the upper surface of the cardboard.

[0006] However, firstly, this gluing process has the following drawbacks: Firstly, the glue between the upper and lower gluing rollers is always exposed. In a chaotic working environment, impurities, especially larger particles, can easily fall into the glue, eventually forming protrusions on the cardboard and waterproof paper layer, affecting the overall appearance. These protrusions may also be damaged by external impacts, affecting the overall quality. Secondly, the surfaces of the two upper gluing rollers are constantly covered with glue. Due to the fluidity of the glue, during the intervals between applications where the rollers are not passing over the cardboard, a small amount of glue will fall onto the surface of the lower gluing roller under gravity. As a result, all roller surfaces in the gluing roller group will be covered with glue, and even the equipment itself will be contaminated, causing the lower surface of the carton that does not require a waterproof paper layer to become dirty, affecting the normal use of the cardboard. Third, the process of glue falling from the gap onto the cardboard is a continuous operation. That is to say, when the entire cardboard passes between the glue-coating rollers, the entire upper surface will be covered with glue. If subsequent pressing operations are carried out, the excess glue between the pressed waterproof paper layer and the cardboard will inevitably overflow from the edges, which will not only waste materials, but also cause the overflowing glue to flow around the cardboard and contaminate the cardboard again. Even the roller surface of the pressing roller will be covered with glue and contaminate the pressing roller.

[0007] Therefore, there are areas for improvement. The present invention provides a laminating machine for composite paperboard. Summary of the Invention

[0008] To address the shortcomings of existing technologies, one of the objectives of this invention is to provide a laminating machine for composite paperboard, the specific solution of which is as follows:

[0009] A composite paperboard pressing machine includes a frame, with a waterproof paper layer conveying station and a paperboard conveying station arranged vertically along the frame. The paperboard conveying station is a paperboard servo conveyor belt arranged on the frame. The waterproof paper layer conveying station includes a waterproof paper layer servo conveyor belt and a waterproof paper layer guide frame arranged adjacent to the frame. The frame has an adhesive application and pressing station arranged horizontally adjacent to the paperboard conveying station.

[0010] The gluing and pressing station includes a pre-pressing flat roller group, a pressing roller group, a gluing structure, and a linkage mechanism.

[0011] The pre-press flat roller group is located between the output end of the paperboard servo conveyor belt and the waterproof paper layer guide frame. It includes an upper pre-press flat roller and a lower pre-press flat roller arranged vertically and rotatably connected to the frame. The distance between the upper pre-press flat roller and the lower pre-press flat roller is set as H1, and H1 is less than or equal to the thickness of the paperboard.

[0012] The linkage mechanism is installed at both ends of the upper pre-compression roller;

[0013] The glue-applying structure is mounted on the frame and is connected to the linkage mechanism for transmission. The upper pre-compression flat roller, which rotates relative to the roller, moves up and down.

[0014] The glue-coating structure stores glue inside, and the downward-facing side forms a glue dispensing section that is initially closed. When the glue dispensing section comes into contact with the cardboard, the glue dispensing section switches to the glue dispensing state.

[0015] The pressure roller assembly is located on the side of the waterproof paper layer guide frame away from the pre-press flat roller assembly. It includes an upper pressure roller and a lower pressure roller arranged vertically and rotatably connected to the frame. The distance between the upper pressure roller and the lower pressure roller is set to H2, which is less than or equal to the sum of the thickness of the paperboard and the waterproof paper layer.

[0016] Therefore, by setting up waterproof paper layer conveying stations and cardboard conveying stations, the frame adopts a method where the upper layer passes through the waterproof paper layer and the lower layer passes through the cardboard. Linkage mechanisms are set at both ends of the pre-pressing flat roller group, and these mechanisms are linked with the gluing structure. The gluing structure contains liquid glue. When the glue outlet is pressurized, it releases the glue onto the upper surface of the cardboard. The glue spreads outwards due to its own fluidity. Under the action of the linkage mechanism, the gluing structure makes multiple intermittent contacts with the upper surface of the cardboard, thus achieving intermittent gluing on the upper surface of the cardboard. The cardboard with glue on its upper surface, along with the waterproof paper layer, enters the gap of the pressing roller group. The pressing roller group applies pressure, bonding the cardboard and the waterproof paper layer together. During the pressure process, the glue that has already spread over a large area on the surface of the carton is squeezed out and spreads rapidly to the edges, increasing the bonding area between the waterproof paper layer and the cardboard, ensuring a certain degree of adhesion.

[0017] It is understood that, compared to the existing glue coating and bonding process using glue coating rollers, this invention replaces the glue coating rollers with a glue coating structure. Firstly, the glue is stored inside the glue coating structure and is not exposed to the external environment, preventing impurities from falling in. Secondly, the glue in the glue coating structure is intermittently dripped onto the upper surface of the cardboard through the glue outlet. No glue overflows when the glue outlet is not in contact with the cardboard, eliminating the need for the rollers to transfer and spread the glue onto the cardboard surface. Furthermore, the cardboard with glue dripping gradually moves away from the pre-pressing roller group, preventing contamination of the pre-pressing roller group. The cardboard with glue dripping is further protected before entering the pressing... Before entering the pressure roller group, the waterproof paper layer will merge with the paperboard. That is, the waterproof paper layer is bonded to the upper surface of the paperboard before entering the pressure roller group. Therefore, there is basically no situation where glue contaminates the roller surface, the lower surface of the paperboard, or the equipment. Thirdly, since the glue of the coating structure falls intermittently on the upper surface of the paperboard, the upper surface of the paperboard will not be completely covered with glue. When it is squeezed by the pressure roller group, the glue will undergo the aforementioned spreading process, making full use of the glue on the paperboard. Therefore, there is basically no situation where excess glue overflows from the edges, greatly reducing material waste and the possibility of contaminating the paperboard.

[0018] In summary, by utilizing the rotational power of the pre-press flat roller group and through simple mechanical combination, the glue coating structure can intermittently apply glue to the upper surface of the cardboard. Utilizing gravity and the fluidity of the glue itself, the glue overflowing from the glue outlet can form a large spreading area with a small volume each time. The pressure of the pressing roller group further expands the spreading area of ​​the glue. The overall structural design is reasonable and makes full use of the functions of each structure.

[0019] Furthermore, the adhesive coating structure also includes a fixing base, a material storage component, and a telescopic guide component;

[0020] The storage unit has a long cylindrical structure with a hollow interior, used to supply glue to the dispensing section. Both ends of the storage unit have transmission rods that cooperate with the linkage mechanism.

[0021] The fixed base is installed on the frame and connected to two spaced telescopic guides. The telescopic ends of the telescopic guides are fixedly connected to the corresponding transmission rods.

[0022] Therefore, by utilizing the space between the waterproof paper layer guide frame and the pre-press flat roller group to install the fixed seat and the structure on the fixed seat, when the storage component is controlled to lift, the telescopic guide slide can be compressed and extended accordingly, thereby improving the stability of the lifting of the storage component.

[0023] Furthermore, the linkage mechanism includes two power cams;

[0024] Two power cams are eccentrically mounted at both ends of the upper pre-compression flat roller, with the end of the power cam furthest from the upper pre-compression flat roller in contact with the transmission rod.

[0025] Therefore, when the upper pre-compression flat roller rotates, the power cam rotates with it. During the rotation, the power cam first pushes the transmission rod, and the telescopic guide slide is compressed, causing the storage component to rise as a whole. After that, the power cam no longer pushes against the transmission rod, and the storage component will descend under the action of gravity, thus realizing the lifting and lowering of the storage component.

[0026] Furthermore, a limiting ring groove adapted to the thickness of the power cam is provided on the outer wall of the transmission rod.

[0027] Therefore, when the power cam presses against the transmission rod, it will be in the limiting groove, which limits the power cam, prevents it from deviating, and improves the stability of the power cam pressing against the transmission rod.

[0028] Furthermore, the dispensing section includes a plurality of linked dispensing heads spaced apart along the length of the storage component;

[0029] The storage component has multiple overflow holes spaced apart. Each overflow hole contains a dispensing head that extends out of the storage component at one end. The outer diameter of the dispensing head gradually decreases in the direction away from the storage component.

[0030] Therefore, when the glue dispensing section is in the glue dispensing state, the glue dispensing head will contact the upper surface of the relatively hard cardboard. The glue dispensing head will be forced to extend into the storage component. As the outer diameter gradually decreases, the size of the overflow hole remains unchanged, and the glue inside the storage component will overflow from the overflow hole and fall onto the upper surface of the cardboard.

[0031] Furthermore, the storage component has a circular cross-section, and the end of the dispensing head located inside the storage component is connected to a weight plate. The weight plate is arc-shaped and fits the inner wall of the storage component.

[0032] Therefore, when the dispensing part is in a closed state, the glue contained in the storage component can apply pressure to the weight plate, and the weight plate itself will also drive the dispensing head to seal the overflow hole as much as possible. The weight plate fits perfectly against the inner wall of the storage component, increasing the sealing performance.

[0033] Furthermore, an air cavity is formed between the inner and outer walls of the storage component, and an air inlet is installed on the outer wall of the storage component, which is connected to the air cavity and connected to an external air source device.

[0034] An air outlet is connected to the outer wall of the storage component near the dispensing head.

[0035] Therefore, regardless of whether the glue dispensing head is in the closed or dispensing state, the gas in the air chamber can be ejected from the air outlet to perform a certain forceful blowing action on the upper surface of the cardboard, blowing away most of the dust and other impurities on the cardboard and reducing the possibility of impurities adhering to the glue.

[0036] Furthermore, a diverter plate is connected to the end of the dispensing head outside the storage component, and an overflow groove is formed on the upper surface of the diverter plate with the dispensing head as the center.

[0037] Therefore, the glue overflowing from between the glue nozzle and the overflow hole will first flow through the distribution plate, and then flow from the overflow groove to the upper surface of the cardboard. Since the overflow groove is distributed in a ring shape, the glue can spread to a greater extent and expand the area of ​​glue spread.

[0038] Furthermore, a supporting round steel bridge is provided between the lower pre-compression flat roller and the lower clamping roller on the frame. The supporting round steel bridge is set on the same plane as the lower pre-compression flat roller and the lower clamping roller.

[0039] As a result, the cardboard with glue on its upper surface gradually leaves the pre-pressing flat roller group and is placed on the surface of the supporting round steel bridge, where it merges with the waterproof paper layer. At this time, the weight on one side of the cardboard gradually increases. In order to reduce the deformation of the cardboard, the supporting round steel bridge supports the cardboard and the waterproof paper layer, making it easier for the two to enter the pressing roller group.

[0040] Another object of the present invention is to provide a working method for the aforementioned composite paperboard pressing machine, the specific solution of which is as follows:

[0041] A method for operating a composite paperboard pressing machine, the composite paperboard pressing machine further comprising a waterproof paper layer pre-stacking mechanism, a first vacuum suction cup robot, a paperboard storage frame, a second vacuum suction cup robot, and a finished product collection rack, characterized in that the method for operating the composite paperboard pressing machine comprises the following steps:

[0042] Waterproof paper layer conveying station preparation: Stacks of waterproof paper layers are stacked on the waterproof paper layer pre-stacking mechanism, and the first vacuum suction cup robot arm transfers the waterproof paper layers sequentially to the waterproof paper layer servo conveyor belt;

[0043] Cardboard conveyor station preparation: Stacks of cardboard are placed on the cardboard storage frame, and the second vacuum suction cup robot transfers the cardboard to the cardboard servo conveyor belt in sequence;

[0044] The waterproof paper layer conveying station and the cardboard conveying station work simultaneously: the waterproof paper layer servo conveyor belt conveys the waterproof paper layer sheet by sheet to the waterproof paper layer guide frame. The waterproof paper layer slides down the waterproof paper layer guide frame and gradually approaches the pressing roller group in the gluing and pressing station until one side of the waterproof paper layer is between the upper pressing roller and the lower pressing roller of the pressing roller group. The cardboard servo conveyor belt conveys the cardboard sheet by sheet and gradually approaches the pre-pressing flat roller group in the gluing and pressing station.

[0045] Glue application and pressing station operation: The side of the cardboard closest to the glue application and pressing station first enters the pre-press flat roller group for pre-press flattening. As the cardboard gradually leaves the pre-press flat roller group, the linkage mechanism and the upper pre-press flat roller work together to drive the glue application structure to rise and fall. When the glue application structure descends, the glue outlet applies glue to the upper surface of the cardboard. The side of the cardboard with glue continues to approach the pressing roller group, and is just aligned with the side of the waterproof paper layer. Then, the aligned cardboard and waterproof paper layer enter the upper pressing roller and lower pressing roller group together for pressing, realizing the bonding of the cardboard and the waterproof paper layer.

[0046] Finished product transfer: The cardboard with the waterproof paper layer attached continues to enter the transfer roller, which pushes the cardboard to fall onto the finished product collection rack.

[0047] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0048] (1) In the process of gluing and bonding, this invention uses only one set of pre-pressing flat rollers. With the help of the pre-pressing flat rollers, the linkage mechanism and the gluing structure are used to pre-press the cardboard flat and then intermittently apply glue to the upper surface of the cardboard. More importantly, based on the rotational power of the pre-pressing flat rollers, the gluing structure can intermittently apply glue to the upper surface of the cardboard through simple mechanical combination. With the help of gravity and the fluidity of the glue itself, the glue overflowing from the glue outlet can form a large spreading area with a small volume each time. The pressure of the pressing rollers is used to further expand the spreading area of ​​the glue and ensure the adhesion between the cardboard and the waterproof paper layer.

[0049] (2) By setting up the pre-press flat roller group, linkage mechanism, glue coating structure and pressing roller group, the roller surfaces of the pre-press flat roller group and pressing roller group will not be contaminated with glue during the feeding, glue coating and bonding and compaction process, and the upper surface of the cardboard and other parts of the frame will not be contaminated with glue, greatly reducing the possibility of being contaminated by glue.

[0050] (3) Without using excessive glue, continuous surface bonding or intermittent surface bonding can be achieved between the waterproof paper layer and the cardboard, greatly reducing the possibility of excess glue overflowing from the edge of the finished product. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the structure of a pressing machine in the background art;

[0052] Figure 2 This is a diagram illustrating the usage status of the adhesive coating roller assembly in the background art.

[0053] Figure 3 This is an overall schematic diagram of the laminating machine for composite paperboard in this invention;

[0054] Figure 4 This is a structural diagram illustrating the positional relationship between the pre-pressing flat roller group, the pressing roller group, and the adhesive coating structure of the present invention;

[0055] Figure 5 This is a structural diagram illustrating the positional relationship between the pre-compression flat roller assembly and the adhesive coating structure;

[0056] Figure 6 This is a structural diagram showing the positional relationship between the upper preload flat roller and the linkage mechanism;

[0057] Figure 7 This is a structural diagram showing the fit between the material storage component and the glue dispensing part;

[0058] Figure 8 Flowchart for the coordination of the glue coating structure, pre-press flat roller group, and paperboard servo conveyor belt (when the glue outlet is in the closed state);

[0059] Figure 9 Flowchart for the coordination of the gluing structure, pre-press flat roller group, and cardboard servo conveyor belt (when the glue outlet is in the glue dispensing state).

[0060] Figure 10 for Figure 9 Enlarged diagram of section A in the middle;

[0061] Figure 11 A flowchart for the coordination of the gluing structure, the pre-press flat roller group, and the cardboard servo conveyor belt (when the glue outlet is equipped with a diverter plate and the glue outlet is in the glue dispensing state).

[0062] Figure 12 for Figure 11 Enlarged diagram of section B;

[0063] Figure 13 This is a schematic diagram illustrating the working principle of the waterproof paper layer guide frame, pressure roller group, glue coating structure, pre-press flat roller group, and cardboard servo conveyor belt working together.

[0064] Reference numerals: 10. Frame; 20. Waterproof paper layer pre-stacking mechanism; 30. Paperboard storage frame; 40. Finished product collection rack; 50. Paperboard conveying station; 501. Paperboard servo conveyor belt; 60. Waterproof paper layer conveying station; 601. Waterproof paper layer servo conveyor belt; 602. Waterproof paper layer guide frame; 70. Gluing and pressing station; 1. Pre-press flat roller group; 11. Upper pre-press flat roller; 12. Lower pre-press flat roller; 2. Pressing roller group; 21. Upper pressing roller. 1. Roller; 22. Lower pressure roller; 3. Glue coating structure; 31. Glue outlet; 311. Glue outlet head; 312. Connecting rod; 313. Weight plate; 32. Fixed seat; 33. Material storage component; 331. Transmission rod; 3311. Limiting ring groove; 332. Overflow hole; 34. Telescopic guide; 4. Linkage mechanism; 41. Power cam; 5. Diverter plate; 51. Overflow groove; 6. Air chamber; 7. Air inlet; 8. Air outlet; 9. Supported round steel bridge. Detailed Implementation

[0065] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0066] Existing automated laminating machines typically include a feeding system, a conveying system, an adhesive coating and bonding system, a compaction system, and a discharging system in terms of hardware, and may even include a cutting system. The hardware configuration facilitates the operation of the laminating process. Software-wise, it generally includes a positioning system, a control system, a user interface, and safety devices. When this type of laminating machine is applied to the paper-plastic composite field, the coordination of various systems or devices in the software allows the waterproof plastic paper layer and the paper to perform corresponding operations in the feeding system, conveying system, adhesive coating and bonding system, compaction system, and discharging system. In this invention, the key improvement lies in the hardware. By combining the conveying process, adhesive coating and bonding process, and compaction process, the problems of contamination of the adhesive coating rollers and cardboard structure during adhesive coating and bonding are mitigated, as are the problems of wasted glue, damage to the cardboard, and the quality of the waterproof paper layer.

[0067] In this regard, such as Figure 3 The aforementioned laminating machine includes a frame 10, a waterproof paper layer pre-coating mechanism 20, a cardboard storage frame 30, a finished product collection rack 40, a first vacuum suction cup robot, and a second vacuum suction cup robot. The frame 10 is the core device for the actual lamination process between the waterproof paper layer and the cardboard. The waterproof paper layer pre-coating mechanism 20 and the first vacuum suction cup robot work together to feed the waterproof paper layer to the frame 10, while the cardboard storage frame 30 and the second vacuum suction cup robot work together to feed the paper to the frame 10. After the frame 10 completes the feeding process, gluing and bonding process, and compaction process of the waterproof paper layer and the paper, a finished product is formed with no excess glue overflowing from the edges. The finished product is then transferred from the frame 10 to the finished product collection rack 40, thus completing the lamination process between the waterproof paper layer and the paper.

[0068] In order to make rational use of the space advantage, the frame 10 is provided with a waterproof paper layer conveying station 60 and a cardboard conveying station 50 arranged vertically. The two stations respectively complete the individual conveying of the waterproof paper layer and cardboard without interfering with each other. Then they meet at a certain position on the frame 10 for subsequent gluing, bonding and other operations.

[0069] Combination Figure 3 and Figure 4 Specifically, the cardboard conveying station 50 is relatively simple; it is a cardboard servo conveyor belt 501 mounted on the frame 10. A conventional belt can be used, and the belt is horizontally positioned to convey individual sheets of cardboard one by one from the input end to the output end. It should be noted that the cardboard here can be corrugated cardboard, honeycomb cardboard, or foam cardboard, etc.

[0070] The waterproof paper layer conveying station 60 is more complex than the cardboard conveying station 50. It is located above the cardboard servo conveyor belt 501 and includes the waterproof paper layer servo conveyor belt 601 and the waterproof paper layer guide frame 602, which are adjacent to each other on the frame 10. The waterproof paper layer servo conveyor belt 601 is horizontally positioned, while the waterproof paper layer guide frame 602 is inclined. One end of the waterproof paper layer guide frame 602 is close to the output end of the waterproof paper layer servo conveyor belt 601, and the other end is at a similar height to the output end of the cardboard servo conveyor belt 501, but there is a certain distance between them, forming a certain space.

[0071] The waterproof paper layer servo conveyor belt 601 also uses the same belt as the paper servo conveyor belt. The items to be conveyed are on the surface. The waterproof paper layer guide frame 602 is a hollow frame with a set of belt guide rollers in the middle. The items to be conveyed are between the belt guide rollers and the hollow frame. Under the friction of the belt guide rollers and the inclination of the hollow frame, the items to be conveyed can not only change position, but also be pre-compressed. When the waterproof paper layer conveying station 60 is in use, single sheets of waterproof paper are horizontally conveyed from the input end of the waterproof paper layer servo conveyor belt 601 to the output end, and then enter the input end of the waterproof paper layer guide frame 602. The waterproof paper layer is then gradually lowered in an inclined state and conveyed to the output end of the waterproof paper layer guide frame 602. The waterproof paper layer here can be a thin layer of paper with a polyethylene film laminated on the surface. It can not only provide waterproofing, but also has a thin thickness, is easy to deform, and can be evenly bonded to the cardboard, which is convenient for subsequent labeling, printing, dyeing, etc.

[0072] It should be noted that the waterproof paper layer conveying station 60 and the cardboard conveying station 50 on the frame 10 have been mentioned above as having dedicated devices for feeding. The feeding of waterproof paper layers to the frame 10 and the feeding of paper to the frame 10 are both existing technologies, and the corresponding devices can all adopt conventional designs. That is, the waterproof paper layer pre-coding mechanism 20, the first vacuum suction cup robot, the cardboard storage frame 30, and the second vacuum suction cup robot have not been substantially improved. Their specific structures and working principles will not be described in detail. In this embodiment, only their cooperation and working process are disclosed.

[0073] Because the waterproof paper layer conveying station 60 is located at a high position, when the waterproof paper layer pre-stacking mechanism 20 and the first vacuum suction cup robot are working, they will first stack the waterproof paper layers on the waterproof paper layer pre-stacking mechanism 20. The waterproof paper layer pre-stacking mechanism 20 will then raise the stack of waterproof paper layers by lifting and lowering. The first vacuum suction cup robot, which is located adjacent to the waterproof paper layer conveying station 60, will then adsorb the upper surface of the waterproof paper layers under the action of vacuum negative pressure. After being firmly suctioned, the paper layers will be transferred to the input end of the waterproof paper layer servo conveyor belt 601.

[0074] Because the cardboard conveying station 50 is at a low height, the cardboard storage frame 30 and the second vacuum suction cup robot are located between the frame 10 and the waterproof paper layer pre-coding mechanism 20, and are directly below the waterproof paper layer servo conveyor belt 601. When the cardboard storage frame 30 and the second vacuum suction cup robot are working, they will stack stacks of paper on the cardboard storage frame 30. The second vacuum suction cup robot can then adsorb the upper surface of the paper under the action of vacuum negative pressure, and after being sucked tightly, it will be transferred to the input end of the paper servo conveyor belt.

[0075] For waterproof paper layers, the gluing and bonding process of paper, and the compaction process, such as Figure 3 The frame 10 is provided with a gluing and pressing station 70 adjacent to the cardboard conveying station 50 in the horizontal direction. Unlike the existing gluing and bonding process which is completed by first using the pre-pressing flat roller group 1 and the gluing roller group, and then using the pressing roller group 2 to complete the pressing process, the gluing and pressing station 70 of the present invention eliminates the setting of the gluing roller group. Under the premise of avoiding the defects of the gluing roller group, while completing the gluing, bonding and pressing operations between the waterproof paper layer and the cardboard, it can not only save the amount of glue used, but also reduce the possibility of contaminating the cardboard and the composite cardboard pressing machine.

[0076] Specifically, combined Figure 4 and Figure 5The gluing and pressing station 70 includes a pre-pressing flat roller group 1, a pressing roller group 2, a gluing structure 3, and a linkage mechanism 4. With the cooperation of the pre-pressing flat roller group 1, the gluing structure 3, and the linkage mechanism 4, the gluing and bonding process is completed first. While the pre-pressing flat roller group 1 performs a pre-pressing rotational motion on the cardboard, gluing is also applied to the cardboard. After gluing, the cardboard and the waterproof paper layer gradually bond together, and then they are pressed together on the pressing roller group 2 to complete the compaction process.

[0077] Among them, the pre-press flat roller group 1, as a structure that works together with the glue coating structure 3 and the linkage mechanism 4 in the glue coating and pressing station 70, is located in the reserved space between the output end of the cardboard servo conveyor belt 501 and the waterproof paper layer guide frame 602. In this way, it can be seen that the cardboard will complete the glue coating operation in the reserved space before it merges with the waterproof paper layer at the output end of the waterproof paper layer guide frame 602. The waterproof paper layer and the cardboard will not affect or hinder each other before they merge.

[0078] The pre-pressing flat roller assembly 1 includes an upper pre-pressing flat roller 11 and a lower pre-pressing flat roller 12 arranged vertically. Both the upper and lower pre-pressing flat rollers 11 and 12 are rotatably connected to the side wall of the frame 10 and are driven by an external power unit, allowing them to rotate relative to the frame 10. To pre-press the cardboard from the cardboard conveying station 50, the distance between the upper and lower pre-pressing flat rollers 11 and 12 is set to H1, where H1 is less than or equal to the thickness of the cardboard. The specific value is set according to the actual working conditions of the cardboard. If the cardboard from the cardboard conveying station 50 has uneven surfaces such as warped corners or internal areas, the cardboard enters between the upper and lower pre-pressing flat rollers 11 and 12. The upper and lower pre-pressing flat rollers 11 and 12 apply pressure to the cardboard, thus achieving the pre-pressing operation.

[0079] It should be noted that the pre-compression flat roller group 1 can adopt a similar structure to existing technologies. The difference is that the length of the upper pre-compression flat roller 11 does not need to be approximately the same as the frame 10, but rather set to be slightly larger than the width of the side of the pre-compression flat roller group 1 parallel to the cardboard, sufficient to fully compress the cardboard. Therefore, as... Figure 5 As shown, the roller shaft at the center of the upper pre-compression flat roller 11 is relatively long and has a certain distance from the side wall of the frame 10, providing an installation position for the linkage mechanism 4. The linkage mechanism 4 is installed at both ends of the upper pre-compression flat roller 11.

[0080] Combination Figure 5 and Figure 7, The glue - applying structure 3 is installed between the two side walls of the frame 10, and is on the side of the pre - flattening roller group 1 away from the cardboard conveying station 50, and there is also a certain distance between it and the pre - flattening roller group 1. The glue - applying structure 3 stores glue inside. The downward side forms a glue - discharging part 31 that is movably arranged relative to the glue - applying structure 3. The initial state of the glue - discharging part 31 is a closed state, and the glue in the glue - applying structure 3 will not overflow from the glue - discharging part 31. When the glue - discharging part 31 contacts the cardboard, the glue - discharging part 31 switches to the glue - discharging state, and the glue in the glue - applying structure 3 will overflow to the upper surface of the cardboard.

[0081] In order to control the overflow of glue from the glue - discharging part 31, the glue - applying structure 3 is传动连接(这里原文“传动连接”未给出准确英文,暂用“drivably connected”替代)to the linkage mechanism 4. With the cooperation of the linkage mechanism 4, the glue - applying structure 3 makes a lifting motion relative to the upper pre - flattening roller 11 that rotates. When it rises to a certain height, the glue - discharging part 31 is in a closed state, and when it descends to a certain height, the glue - discharging part 31 is in the glue - discharging state.

[0082] Specifically, in order to store and release glue, combined with Figure 7 and Figure 8 , in addition to the glue - discharging part 31, the glue - applying structure 3 further includes a fixed seat 32, a storage part 33, and a telescopic guide and sliding part 34. The storage part 33 has a long - tube structure, and its length is about the same as that of the upper pre - flattening roller 11. It is hollow inside and can be used to store a certain amount of liquid glue. The lower side of the storage part 33 is provided with the glue - discharging part 31. In this way, under the action of gravity, the glue will supply glue to the glue - discharging part 31 on the lower side.

[0083] The glue - discharging part 31 includes a plurality of linked glue - discharging heads 311 arranged at intervals along the length direction of the storage part 33. The number is not limited. The glue - discharging heads 311 have a conical structure. A plurality of spaced - apart overflow holes 332 (such as Figure 10 ) are correspondingly opened on the storage part 33. Each overflow hole 332 has a glue - discharging head 311 inserted into it, and one end of the glue - discharging head 311 extends out of the storage part 33. The outer diameter of the glue - discharging head 311 gradually decreases along the direction away from the storage part 33.

[0084] To achieve linkage, a connecting rod 312 is fixedly inserted through all the glue - discharging heads 311 at the same time, such as Figure 7The connecting rod 312 is located outside the storage component 33, closer to the end with the smaller outer diameter of the dispensing head 311. When the dispensing part 31 is in the closed state, the dispensing head 311 fills the overflow hole 332 under its own weight and the force of the glue, thus sealing the glue in the storage component 33. When the dispensing part 31 is in the dispensing state, the dispensing head 311 contacts the upper surface of the relatively hard cardboard. The dispensing head 311 is forced into the storage component 33. As the outer diameter gradually decreases, the size of the overflow hole 332 remains unchanged, and the glue inside the storage component 33 overflows from the overflow hole 332 and falls onto the upper surface of the cardboard. At the same time, the connecting rod 312 also acts as a limit to prevent the entire dispensing head 311 from being submerged in the storage component 33.

[0085] Because the adhesive is fluid, the adhesive on the cardboard will slowly spread outwards, gradually increasing the spreading area. The longer the adhesive dispensing section 31 is in the dispensing state each time, the larger the volume of adhesive falling onto the cardboard, and the larger the spreading area will be. Moreover, since there are multiple dispensing heads 311 spaced apart, multiple spreading areas will be formed on the upper surface of the cardboard. The positions of the dispensing heads 311 at the beginning and end of the storage component 33, the number of dispensing heads 311, and the spacing between two adjacent dispensing heads 311 can all be adjusted according to the bonding effect required by the lamination process, thereby controlling whether different spreading areas merge. No specific limitations are made in this invention.

[0086] For example, if a continuous surface bonding effect is desired between the waterproof paper layer and the cardboard, the glue dispensing head 311 can remain in contact with the cardboard surface and continue dispensing glue. The cardboard is continuously pushed into the pre-press flat roller group 1 by the cardboard servo conveyor belt 501, and the glue from the glue dispensing head 311 will continuously fall onto the cardboard that is gradually passing below.

[0087] For example, if you want the waterproof paper layer and the cardboard to bond in an intermittent surface manner, the glue dispensing head 311 can regularly contact the surface of the cardboard and maintain a regular glue dispensing state. The cardboard is continuously pushed into the pre-press flat roller group 1 by the cardboard servo conveyor belt 501, and the glue overflowing from the glue dispensing head 311 each time will fall onto the corresponding cardboard below.

[0088] In both of the above situations, in order to achieve the lifting and lowering action of the adhesive application structure 3, thereby switching the adhesive dispensing head 311 from the closed state to the dispensing state, combined with Figure 6 and Figure 7The storage component 33 has transmission rods 331 at both ends. The fixed base 32 is fixedly connected to the frame 10 at both ends. Two spaced telescopic guides 34 are connected to the lower side of the fixed base 32. The telescopic guides 34 are telescopic rods, and their telescopic ends are fixedly connected to the corresponding transmission rods 331. The linkage mechanism 4 includes two power cams 41, which are eccentrically mounted at both ends of the upper pre-compression flat roller 11. Specifically, the end of the power cam 41 with the larger diameter is connected to the upper pre-compression flat roller 11, and the end of the power cam 41 away from the upper pre-compression flat roller 11 is in contact with the transmission rods 331. To ensure stable contact between the power cams 41 and the transmission rods 331, a limiting annular groove 3311 is formed on the outer wall of the transmission rod 331. The limiting annular groove 3311 is adapted to the thickness of the power cams 41 and can limit the movement of the power cams 41.

[0089] Combination Figure 8 In this orientation, the upper pre-compression roller 11 rotates clockwise, at which point the power cam 41 pushes against the transmission rod 331, and the glue outlet 311 is in a closed state. For example... Figure 8 As shown, when the upper pre-press flat roller 11 rotates, the power cam 41 rotates with it. The smaller diameter end of the power cam 41 will change position. During the rotation, the power cam 41 will first push the transmission rod 331, and the telescopic guide 34 will be compressed, causing the storage part 33 to rise as a whole. After that, the power cam 41 no longer pushes against the transmission rod 331. Under the action of gravity, the storage part 33 will fall until it contacts the surface of the cardboard, triggering the glue dispensing head 311 to switch to glue dispensing state.

[0090] Since the power cam 41 rotates regularly with the upper pre-press flat roller 11, the power cam 41 will regularly perform the above-mentioned top-pressing transmission rod 331 action. It should be noted that in this invention, when the power cam 41 is about to complete the top-pressing storage component 33 rising to the highest point, the servo parameters of the cardboard servo conveyor belt 501 can be set to control one side of the cardboard to just emerge from between the pre-press flat roller group 1. Then, when the storage component 33 descends, it can just achieve the application of glue to one side of the cardboard. After repeated cycles, multiple glue spreading areas can be formed on the surface of the cardboard, achieving the bonding effect of intermittent surface bonding between the waterproof paper layer and the cardboard.

[0091] With this linkage mechanism 4 in place, in order to achieve a continuous surface bonding effect between the waterproof paper layer and the cardboard, the present invention can set the maximum length of the power cam 41 to be smaller and the distance between the power cam 41 and the transmission rod 331 to be larger, thereby reducing the duration of the power cam 41 pressing against the transmission rod 331. This allows the storage component 33 to descend more quickly and contact the upper surface of the cardboard. In addition, the glue overflowing from the glue dispensing head 311 each time has a certain range of spreading area, and each two adjacent spreading areas can be connected, so that the upper surface of the cardboard ultimately presents a continuous glue.

[0092] Combination Figure 9 and Figure 10 To improve the smoothness of glue overflow in the storage component 33, the storage component 33 can adopt a cylindrical structure with a circular cross-section. A weight plate 313 is connected to the end of the glue outlet 311 inside the storage component 33. The weight plate 313 is arc-shaped and fits the inner wall of the storage component 33. After the glue is directly stored in the cavity inside the storage component 33, the weight plate 313 adheres to the inner wall of the storage component 33, and the glue outlet 311 precisely seals the overflow hole 332.

[0093] Combination Figure 11 and Figure 12 To improve the diffusion of adhesive overflowing from each dispensing head 311, a flow divider plate 5 is connected to the end of the dispensing head 311 outside the storage component 33. The flow divider plate 5 can be configured as a disc, and an overflow groove 51 is formed around the dispensing head 311 on the upper surface of the flow divider plate 5. That is, there are multiple overflow grooves 51, which are distributed in a ring. Moreover, the overflow grooves 51 are configured with a certain inclined angle to reduce the resistance of the overflow grooves 51 to the flow of adhesive.

[0094] When the glue dispensing head 311 is in the glue dispensing state, the glue overflowing from the glue dispensing head 311 and the overflow hole 332 will first flow through the diversion plate 5, and then flow from the overflow groove 51 to the upper surface of the cardboard. Since the overflow groove 51 is distributed in a ring shape, the glue can spread to a greater extent and expand the glue spreading area.

[0095] Combination Figure 11 and Figure 12 In order to improve the purity of the overflowing glue on the surface of the cardboard, an air cavity 6 is formed between the inner and outer walls of the storage component 33. The air cavity 6 is a sandwich layer. An air inlet 7 connected to the air cavity 6 is installed on the outer wall of the storage component 33. At least one air inlet 7 is provided. The air inlet 7 is connected to an external air source device. Gas enters the cavity between the storage tube and the storage component 33 through the air inlet 7.

[0096] The outer wall of the material storage component 33, near the glue dispensing head 311, is equipped with symmetrically arranged air nozzles 8. Whether the glue dispensing head 311 is closed or dispensing glue, gas from the air chamber 6 can be ejected from the air nozzles 8, performing a blowing action on the upper surface of the cardboard with a certain force, removing most of the dust and other impurities from the cardboard and reducing the possibility of impurities adhering to the glue. Furthermore, in the dispensing state, the gas ejected from the air nozzles 8 can also apply a certain pushing force to the overflow trough 51 or the glue on the cardboard, further expanding the glue coverage area.

[0097] like Figure 13 As the cardboard gradually leaves the pre-pressing roller group 1, one side of the cardboard is covered with glue, increasing its weight. To address this, the frame 10 is equipped with a supporting round steel bridge 9 located between the lower pre-pressing roller 12 and the lower pressing roller 22. The supporting round steel bridge 9 is formed by multiple connected rods with smaller diameters. The supporting round steel bridge 9 is set on the same plane as the lower pre-pressing roller 12 and the lower pressing roller 22. The supporting round steel bridge 9 can support the cardboard. At the same time, the waterproof paper layer coming out of the waterproof paper layer guide frame 602 above the supporting round steel bridge 9 will merge with the cardboard. The supporting round steel bridge 9 supports both the cardboard and the waterproof paper layer, facilitating their entry into the pressing roller group 2.

[0098] like Figure 13 The pressure roller group 2 is located on the side of the waterproof paper layer guide frame 602 away from the pre-press flat roller group 1. At least one group is provided, including an upper pressure roller 21 and a lower pressure roller 22 arranged vertically. Both the upper and lower pressure rollers 21 and 22 are rotatably connected to the side wall of the frame 10 and are driven by an external power device, allowing them to rotate relative to the frame 10. To ensure the cardboard and waterproof paper layer have a certain adhesive force under the action of glue, the distance between the upper and lower pressure rollers 21 and 22 is set to H2, where H2 is less than or equal to the sum of the thicknesses of the cardboard and the waterproof paper layer. The cardboard with glue applied to its surface and the waterproof paper layer enter the gap of the pressure roller group 2 together. The pressure roller group 2 applies pressure, bonding the cardboard and the waterproof paper layer together. During the pressure process, the glue that has spread over a large area on the surface of the carton is squeezed and spreads rapidly to the edges, increasing the bonding area between the waterproof paper layer and the cardboard and ensuring a certain adhesive force.

[0099] In summary, the core processes of the laminator for composite paperboard, namely gluing and bonding, and compaction, utilize a set of pre-pressing flat rollers 1 and two sets of pressing rollers 2. By making full use of the space between each roller set and the characteristics of liquid glue, paper-plastic integration with virtually no pollution can be achieved.

[0100] Regarding the aforementioned laminating machine for composite paperboard, the present invention also proposes a working method, comprising the following steps:

[0101] Waterproof paper layer conveying station 60 preparation: Stacks of waterproof paper layers are stacked on the waterproof paper layer pre-stacking mechanism 20, and the first vacuum suction cup robot arm transfers the waterproof paper layers sequentially to the waterproof paper layer servo conveyor belt 601;

[0102] Cardboard conveying station 50 preparation: Stacks of cardboard are stacked on cardboard storage frame 30, and the second vacuum suction cup robot transfers the cardboard to cardboard servo conveyor belt 501 in sequence;

[0103] The waterproof paper layer conveying station 60 and the cardboard conveying station 50 work simultaneously: the waterproof paper layer servo conveyor belt 601 conveys the waterproof paper layer sheet by sheet to the waterproof paper layer guide frame 602. The waterproof paper layer slides down along the waterproof paper layer guide frame 602 and gradually approaches the pressing roller group 2 in the gluing and pressing station 70 until one side of the waterproof paper layer is between the upper pressing roller 21 and the lower pressing roller 22 of the pressing roller group 2. The cardboard servo conveyor belt 501 conveys the cardboard sheet by sheet and gradually approaches the pre-pressing flat roller group 1 of the gluing and pressing station 70.

[0104] The gluing and pressing station 70 operates as follows: The side of the cardboard closest to the gluing and pressing station 70 first enters the pre-pressing flat roller group 1 for pre-pressing flat operation. As the cardboard gradually leaves the pre-pressing flat roller group 1, the linkage mechanism 4 and the upper pre-pressing flat roller 11 work together to drive the gluing structure 3 to rise and fall. When the gluing structure 3 descends, the glue outlet 31 applies glue to the upper surface of the cardboard. The side of the cardboard coated with glue continues to approach the pressing roller group 2 and is aligned with the side of the waterproof paper layer. Then, the aligned cardboard and the waterproof paper layer enter the pressing roller group 2 together between the upper pressing roller 21 and the lower pressing roller 22 for pressing operation, thereby achieving the bonding of the cardboard and the waterproof paper layer.

[0105] Finished product transfer: The cardboard with the waterproof paper layer continues to enter another pressure roller group 2, and the pressure roller group 2 pushes the cardboard to fall onto the finished product collection rack 40.

[0106] Ultimately, this invention yields a paperboard with a waterproof paper layer on its surface, which, when applied in packaging, transportation, and other scenarios, can provide waterproofing, moisture protection, and increase the strength of the paperboard.

[0107] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A laminating machine for composite paperboard, comprising a frame (10), wherein the frame (10) is provided with a waterproof paper layer conveying station (60) and a paperboard conveying station (50) arranged vertically in a vertical direction, the paperboard conveying station (50) being a paperboard servo conveyor belt (501) disposed on the frame (10), and the waterproof paper layer conveying station (60) comprising a waterproof paper layer servo conveyor belt (601) and a waterproof paper layer guide frame (602) disposed adjacent to each other on the frame (10), characterized in that, The frame (10) is provided with a gluing and pressing station (70) adjacent to the cardboard conveying station (50) in the horizontal direction; The gluing and pressing station (70) includes a pre-pressing flat roller group (1), a pressing roller group (2), a gluing structure (3), and a linkage mechanism (4), wherein, The pre-press flat roller group (1) is located between the output ends of the paperboard servo conveyor belt (501) and the waterproof paper layer guide frame (602), including an upper pre-press flat roller (11) and a lower pre-press flat roller (12) arranged vertically and rotatably connected to the frame (10). The distance between the upper pre-press flat roller (11) and the lower pre-press flat roller (12) is set to H1, and H1 is less than or equal to the thickness of the paperboard. The linkage mechanism (4) is installed at both ends of the upper pre-compression flat roller (11), including two power cams (41). The end of the power cam (41) with a larger diameter is connected to the upper pre-compression flat roller (11), and the end of the power cam (41) away from the upper pre-compression flat roller (11) is in contact with the transmission rod (331). The glue coating structure (3) is mounted on the frame (10) and is connected to the linkage mechanism (4) for transmission. It lifts and lowers relative to the upper pre-pressing flat roller (11) which rotates. The glue-coating structure (3) stores glue inside, and a glue outlet (31) is formed on the downward side. The glue outlet (31) is initially closed. When the glue outlet (31) comes into contact with the cardboard, the glue outlet (31) switches to the glue outlet state. The adhesive coating structure (3) also includes a storage component (33). Both ends of the storage component (33) are formed with transmission rods (331) that cooperate with the linkage mechanism (4). The storage component (33) is provided with a plurality of spaced overflow holes (332). Each overflow hole (332) is inserted with an adhesive outlet head (311) that extends out of the storage component (33) at one end. The adhesive outlet head (311) has a conical structure. The pressing roller group (2) is located on the side of the waterproof paper layer guide frame (602) away from the pre-pressing flat roller group (1), including an upper pressing roller (21) and a lower pressing roller (22) arranged vertically and rotatably connected to the frame (10). The distance between the upper pressing roller (21) and the lower pressing roller (22) is set to H2, which is less than or equal to the sum of the thickness of the paperboard and the waterproof paper layer.

2. The laminating machine for composite paperboard according to claim 1, characterized in that, The adhesive coating structure (3) also includes a fixing seat (32) and a telescopic guide (34); The storage component (33) has a long cylindrical structure and a hollow interior, which is used to provide glue to the glue dispensing part (31); The fixed base (32) is installed on the frame (10) and connected to two spaced telescopic guides (34). The telescopic ends of the telescopic guides (34) are fixedly connected to the corresponding transmission rods (331).

3. The laminating machine for composite paperboard according to claim 2, characterized in that, The outer wall of the transmission rod (331) is provided with a limiting ring groove (3311) that matches the thickness of the power cam (41).

4. The laminating machine for composite paperboard according to claim 3, characterized in that, The cross-section of the storage component (33) is circular. The end of the dispensing head (311) inside the storage component (33) is connected to a weight plate (313). The weight plate (313) is arc-shaped and fits the inner wall of the storage component (33).

5. The laminating machine for composite paperboard according to claim 4, characterized in that, An air cavity (6) is formed between the inner wall and the outer wall of the storage component (33). An air inlet (7) connected to the air cavity (6) is installed on the outer wall of the storage component (33). The air inlet (7) is connected to an external air source device. An air outlet (8) is provided on the outer wall of the storage component (33) near the dispensing head (311).

6. The laminating machine for composite paperboard according to claim 5, characterized in that, The end of the dispensing head (311) located outside the storage component (33) is connected to a diversion plate (5), and an overflow groove (51) is formed on the upper surface of the diversion plate (5) with the dispensing head (311) as the center.

7. The laminating machine for composite paperboard according to any one of claims 1-6, characterized in that, The frame (10) is provided with a supporting round steel bridge (9) between the lower pre-pressing flat roller (12) and the lower pressing roller (22). The supporting round steel bridge (9) is set on the same plane as the lower pre-pressing flat roller (12) and the lower pressing roller (22).

8. A method of operating a laminating machine for composite paperboard according to any one of claims 1-6, wherein the laminating machine further comprises a waterproof paper layer pre-coding mechanism (20), a first vacuum suction cup robot, a paperboard storage frame (30), a second vacuum suction cup robot, and a finished product collection rack (40), characterized in that, The working method of the laminating machine for composite paperboard includes the following steps: Waterproof paper layer conveying station (60) preparation: stacks of waterproof paper layers are stacked on the waterproof paper layer pre-stacking mechanism (20), and the first vacuum suction cup robot transfers the waterproof paper layers sequentially to the waterproof paper layer servo conveyor belt (601); Paperboard conveying station (50) preparation: Stacks of paperboard are stacked on the paperboard storage frame (30), and the second vacuum suction cup robot transfers the paperboard to the paperboard servo conveyor belt (501) in sequence; The waterproof paper layer conveying station (60) and the cardboard conveying station (50) work simultaneously: the waterproof paper layer servo conveyor belt (601) conveys the waterproof paper layer one by one to the waterproof paper layer guide frame (602), the waterproof paper layer slides down along the waterproof paper layer guide frame (602) and gradually approaches the pressing roller group (2) in the gluing and pressing station (70) until one side of the waterproof paper layer is between the upper pressing roller (21) and the lower pressing roller (22) of the pressing roller group (2), and the cardboard servo conveyor belt (501) conveys the cardboard one by one and gradually approaches the pre-pressing flat roller group (1) of the gluing and pressing station (70); Glue application and pressing station (70) operation: The side of the cardboard closest to the glue application and pressing station (70) first enters the pre-press flat roller group (1) for pre-press flat operation. As the cardboard gradually leaves the pre-press flat roller group (1), the linkage mechanism (4) and the upper pre-press flat roller (11) cooperate to drive the glue application structure (3) to rise and fall. When the glue application structure (3) makes a downward movement, the glue outlet (31) applies glue to the upper surface of the cardboard. The side of the cardboard coated with glue continues to approach the pressing roller group (2) and is just aligned with the side of the waterproof paper layer. Then, the aligned cardboard and the waterproof paper layer enter the pressing roller group (2) together between the upper pressing roller (21) and the lower pressing roller (22) for pressing operation to achieve the bonding of the cardboard and the waterproof paper layer. Finished product transfer: The cardboard with the waterproof paper layer attached continues to enter another pressing roller group (2), and the pressing roller group (2) pushes the cardboard to fall onto the finished product collection rack (40).

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