Paper laminating machine and paper turnover multi-layer laminating process

Abstract

The invention discloses a paper laminating machine and a paper turnover multi-layer laminating process, and the paper laminating machine comprises a front laminating machine, a paper pile processing device, a troposphere air curtain pressing mechanism, a turnover mechanism, a rear laminating machine and a drying and collecting mechanism which are sequentially arranged in the paper conveying direction; in order to overcome the defects in the prior art, the paper laminating machine and method which are simple in structure and capable of achieving automatic turning over of the single-face composite paper board and completing two-time laminating continuously and efficiently are provided, so that the technological process is simplified, the labor cost is reduced, and the product quality and the production efficiency are improved.

Description

Technical Field

[0001] This invention relates to a paper laminating machine and a multi-layer paper flipping and laminating process. Background Technology

[0002] Color-printed paper packaging (also known as color box packaging) has become one of the mainstream forms of product packaging due to its combination of aesthetics and recyclability. This type of packaging is typically made by laminating thin, flexible, printed color-printed cardboard with thicker, stronger corrugated paper or cardboard that provides structural support. Depending on the decorative requirements, color boxes can be divided into single-sided decorative color boxes (with color-printed cardboard on only the outer surface) and double-sided decorative color boxes (with color-printed cardboard on both the inner and outer surfaces). The core raw material for producing double-sided decorative color boxes is a double-sided composite cardboard, which requires laminating color-printed cardboard onto both sides of the corrugated paper or cardboard.

[0003] Currently, the mainstream process for producing this type of double-sided composite paperboard in the industry involves two independent lamination operations using a paper laminating machine. The specific process is as follows: First, printed cardboard is used as the face paper, and corrugated paper and cardboard are used as the back paper. These are laminated once on the laminating machine to form a single-sided composite paperboard. After the single-sided composite paperboard is pressed, dried, and cured, it needs to be manually transported back to the loading end of the laminating machine for a second loading. During the second loading, the single-sided composite paperboard needs to be flipped 180 degrees so that the side originally laminated with the printed cardboard is facing down. Then, a second sheet of printed cardboard is laminated onto the other surface of the corrugated paper and cardboard, finally completing the double-sided lamination.

[0004] However, this traditional process has significant drawbacks: First, the process is lengthy and costly. The two bonding processes require two machine runs and two handling operations, with additional drying and transfer steps in between, resulting in extremely low production efficiency. Furthermore, the large amount of manual handling and repetitive operations significantly increases production costs and labor intensity.

[0005] Secondly, the deformation is complex and quality is difficult to control. During the lamination and drying process of single-sided composite paperboard, due to the differences in material density, thickness, and water absorption properties between the printed cardboard, corrugated paper, and paperboard, bending deformation inevitably occurs towards the printed cardboard side. This introduces inaccuracies in the alignment of the printed cardboard during the second lamination. This physical deformation necessitates manual leveling of the paperboard before the second lamination, which is not only physically demanding but also difficult to accurately correct. If the leveling is not thorough, it will lead to misalignment of the patterns on the two printed cardboard sheets during the second lamination, directly affecting the quality of the finished product and increasing the defect rate.

[0006] Third, the structure is limited and the degree of automation is low. The existing single-station laminating machine is only suitable for single-layer lamination in one direction. It cannot realize automatic flipping, continuous conveying and secondary lamination of single-sided composite paperboard, which seriously restricts the automation and large-scale production of double-sided composite paperboard.

[0007] Therefore, existing paper laminating machines need further improvement. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a paper laminating machine and method with a simple structure that can realize automatic flipping of single-sided composite paperboard and complete two consecutive and efficient laminations, so as to simplify the process, reduce labor costs, and improve product quality and production efficiency.

[0009] To achieve the above objectives, the present invention adopts the following solution: a paper laminating machine, characterized in that: it includes a front laminating machine, a paper stacking device, a tropospheric air curtain pressing mechanism, a flipping mechanism, a rear laminating machine, and a drying and collecting mechanism arranged sequentially along the paper conveying direction; The front laminating machine is used to laminate the first color-printed cardboard to the base paper on one side to form a single-sided composite paperboard. The paper stacking device is located at the paper output end of the front laminator and includes a lifting paper receiving mechanism and a longitudinal paper pushing mechanism. The lifting paper receiving mechanism is used to receive and stack the single-sided composite paperboard output by the front laminator, and the longitudinal paper pushing mechanism is used to push the stack of single-sided composite paperboard with the stack height meeting the standard to the tropospheric air curtain pressing mechanism. The tropospheric air curtain pressing mechanism is located between the paper stack processing device and the flipping mechanism, and is used to pressurize and blow air to dehumidify the single-sided composite paperboard stack to increase the bonding force. The flipping mechanism is used to flip the stack of single-sided composite cardboard after it has been processed by the tropospheric air curtain pressing mechanism by 180 degrees and send it into the post-lamination machine. The post-lamination machine is used to laminate the single-sided composite paper that has been flipped 180 degrees to the second color-printed cardboard on one side to form a double-sided composite paperboard. The drying mechanism is located at the paper output end of the post-laminating machine and is used to dry and cure the double-sided composite paperboard.

[0010] As another improvement to the paper laminating machine of the present invention, the front laminating machine includes a front machine platform, on which a first face paper conveying mechanism, a first back paper conveying mechanism, and a first coating and laminating mechanism are arranged. The first face paper conveying mechanism is used to convey first color-printed cardstock to the first coating and laminating mechanism one by one; the first back paper conveying mechanism is used to convey back paper to the first coating and laminating mechanism one by one; the first coating and laminating mechanism is used to first apply adhesive to the upper surface of the back paper, and then laminate the first color-printed cardstock onto the back paper.

[0011] As another improvement to the paper laminating machine of the present invention, the first coating and laminating mechanism includes a coating machine table. An upper paper feeding roller and a lower paper feeding roller are symmetrically arranged in the vertical direction at the feed end of the coating machine table. One end of the upper paper feeding roller is connected to a first drive motor located on one side of the coating machine table. An upper adhesive coating wheel and a lower paper lifting wheel are symmetrically arranged in the vertical direction on the coating machine table on the paper output end side of the upper paper feeding roller. An adhesive amount adjusting wheel is arranged on the coating machine table on the side of the upper adhesive coating wheel near the upper paper feeding roller. The adhesive amount adjusting wheel and the upper adhesive coating wheel are rolled and abutted against each other. An adhesive storage area is formed above, and an adhesive delivery pipe is provided on the coating machine platform to deliver adhesive to the adhesive storage area. A washing roller is provided on the coating machine platform on the side of the lower lifting paper roller near the upper paper feeding roller. The washing roller and the lower lifting paper roller are rolled and attached to each other. An upper pressing steel roller and a lower pressing steel roller are symmetrically arranged in the vertical direction on the coating machine platform at the paper output end of the upper adhesive coating roller. A face paper bridge plate is provided on the coating machine platform between the upper pressing steel roller and the upper adhesive coating roller to synchronously guide the first color printing card paper and the base paper into the face paper between the upper pressing steel roller and the lower pressing steel roller.

[0012] As another improvement to the paper laminating machine of the present invention, the first base paper conveying mechanism includes base paper support plates spaced apart on the coating machine table. A drive roller and a driven roller are spaced apart between the two base paper support plates. The drive roller is connected to a second drive motor mounted on the base paper support plate. A suction belt is fitted on the drive roller and the driven roller. A suction box is installed inside the suction belt. The suction box is mounted on the base paper support plate through a suction pipe. A bidirectional screw is movably mounted on the base paper support plate on the paper feeding end side of the drive roller. A slide block is installed on the bidirectional screw. A baffle is installed on the slide block. A drive gear is installed inside the base paper support plate. The drive gear is connected to a third drive motor. A transmission gear is installed at one end of the bidirectional screw. The transmission gear meshes with the drive gear. A base paper stop is installed at the paper output end of the base paper support plate.

[0013] As another improvement to the paper laminating machine of the present invention, the first paper conveying mechanism includes symmetrically spaced paper support plates, with multiple supporting beams spaced from top to bottom between the two paper support plates, a paper outlet is provided at the upper part of the paper support plate, a paper alignment rod is provided at the paper outlet, paper alignment pieces are spaced on the paper alignment rod, a lifting rail is provided inside the paper support plate, a lifting platform is provided inside the lifting rail, the lifting platform is movably disposed on the lifting rail, a lifting drive mechanism is provided inside the paper support plate, the lifting platform is connected to the lifting drive mechanism, a paper feeder is provided on one side of the paper outlet end of the paper support plate, a number of pressure rollers are spaced along the paper movement direction inside the paper feeder, a connecting paper feeder frame composed of a number of spaced-apart bridge inclined plates is provided between the paper outlet end of the paper feeder frame and the paper inlet end of the first coating and laminating mechanism, and side air boxes are provided on both sides of the connecting paper feeder frame.

[0014] As another improvement to the paper laminating machine of the present invention, the tropospheric air curtain pressing mechanism includes a tropospheric air curtain pressing chamber. The paper inlet end of the tropospheric air curtain pressing chamber is connected to the paper outlet end of the paper stack processing device. A top-pressure ceiling is provided on the upper part of the tropospheric air curtain pressing chamber. A vertical paper pushing mechanism is provided in the lower part of the tropospheric air curtain pressing chamber, which enables the single-sided composite paperboard stack to press upward against the top-pressure ceiling. A blower mechanism is provided in the tropospheric air curtain pressing chamber.

[0015] As another improvement to the paper laminating machine of the present invention, the paper stacking device further includes a non-stop paper receiving mechanism; the non-stop paper receiving mechanism is telescopically arranged below the paper output of the front laminating machine, and is used to temporarily receive paper during the descent and transfer of the lifting paper receiving mechanism.

[0016] As another improvement to the paper laminating machine of the present invention, the flipping mechanism includes a base, on which support vertical plates are spaced apart. Gear turntables are respectively arranged on the inner side of the support vertical plates. A first drive gear is arranged on the support vertical plate on one side of the gear turntable, and the first drive gear meshes with the gear turntable. A rotary drive motor is arranged on the outer side of the support vertical plates and is connected to the first drive gear. Slide rails are spaced apart on the gear turntable. Upper slides and lower slides are spaced apart on the slide rails. A first clamping plate is arranged on the two upper slides and a second clamping plate is arranged on the two lower slides. A first transmission rack is arranged on one side of the first clamping plate and a second transmission rack is arranged on one side of the second clamping plate. A second drive gear is arranged on the gear turntable and meshes with the first transmission rack and the second transmission rack respectively. A clamping drive motor is arranged on the outer side of the support vertical plates and is connected to the second drive gear. A flipping and pushing paper mechanism capable of feeding the flipped single-sided composite paperboard into the post-laminating machine is arranged on the base between the two support vertical plates.

[0017] As another improvement to the paper laminating machine of the present invention, the post-laminating machine includes a post machine table, on which a second face paper conveying mechanism, a second back paper conveying mechanism, and a second coating and laminating mechanism are arranged. The second face paper conveying mechanism is used to convey second color-printed cardboard to the second coating and laminating mechanism one by one; the second back paper conveying mechanism is used to convey single-sided composite cardboard that has been flipped 180 degrees to the second coating and laminating mechanism one by one; the second coating and laminating mechanism is used to apply adhesive to the horizontal upper surface of the single-sided composite cardboard that has been flipped 180 degrees, and then laminating the second color-printed cardboard onto the single-sided composite cardboard.

[0018] This invention discloses a multi-layer paper flipping and laminating process based on the paper laminating machine described in any of the preceding claims, characterized by comprising the following steps: S1. Front lamination: At the front lamination machine, the first color-printed cardboard is laminated with the corrugated paper and cardboard on one side to form a single-sided composite cardboard. S2, Stacking and Transfer: The single-sided composite paperboard continuously output in step S1 is stacked into a four-sided aligned paper stack through the coordinated action of the lifting paper receiving mechanism and the paper pushing mechanism. When the height of the paper stack reaches the set requirement, the paper pushing mechanism pushes the entire stack of paper to the next work station. S3. Pressing and dehumidification: The single-sided composite paperboard stack pushed in step S2 is sent into the convective air curtain pressing chamber. The stack is pressed upward by a liftable pressure platform, and at the same time, the stack is dehumidified by blowing air to enhance the initial tack and accelerate drying. S4. Flipping: Flip the entire stack of single-sided composite cardboard after step S3 so that the first color-printed cardboard faces down and the corrugated paper and cardboard face up. S5. Post-lamination: Apply glue to the top surface of the single-sided composite paperboard after it has been flipped in step S4, and then laminate it with the second color-printed cardboard fed from above to form a double-sided composite paperboard. S6. Drying and collecting: The double-sided composite paperboard obtained in step S5 is pressed, dried and then collected.

[0019] In summary, the advantages of this invention compared to the prior art are as follows: This invention has a simple structure, integrating the front laminator, paper stack processing device, tropospheric air curtain pressing mechanism, flipping mechanism, rear laminator and drying and collecting mechanism into a continuous production line, realizing fully automated operation from the first side lamination to the second side lamination, eliminating the intermediate product handling, temporary storage, manual flipping and repeated feeding links in the traditional process, greatly shortening the production cycle and improving the overall production efficiency. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0021] Figure 2 This is a three-dimensional schematic diagram of the front bonding machine of the present invention.

[0022] Figure 3 This is a three-dimensional schematic diagram of the first coating and bonding mechanism of the present invention.

[0023] Figure 4 This is a schematic diagram of the internal structure of the first bottom paper conveying mechanism of the present invention.

[0024] Figure 5 This is a schematic diagram of the first paper conveying mechanism of the present invention.

[0025] Figure 6 This is one of the schematic diagrams of the flipping mechanism of the present invention.

[0026] Figure 7 This is the second schematic diagram of the flipping mechanism of the present invention.

[0027] Figure 8 This is a schematic diagram of the present invention. Detailed Implementation

[0028] The above-mentioned and other technical features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.

[0029] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0030] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0031] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] like Figure 1-8 As shown, a paper laminating machine is characterized by comprising a front laminating machine 1, a paper stacking device 2, a tropospheric air curtain pressing mechanism 3, a flipping mechanism 4, a rear laminating machine 5, and a drying and collecting mechanism 6 arranged sequentially along the paper conveying direction. The front laminating machine 1 is used to laminate the first color-printed cardboard 100 to the base paper 200 on one side to form a single-sided composite paperboard. The paper stacking device 2 is located at the paper output end of the front laminator 1, and includes a lifting paper receiving mechanism 21 and a longitudinal paper pushing mechanism 22. The lifting paper receiving mechanism 21 is used to receive and stack the single-sided composite paperboard output by the front laminator 1, and the longitudinal paper pushing mechanism 22 is used to push the stack of single-sided composite paperboard with the stacking height meeting the standard to the tropospheric air curtain pressing mechanism 3. The tropospheric air curtain pressing mechanism 3 is located between the paper stack processing device 2 and the flipping mechanism 4, and is used to pressurize and blow air to dehumidify the single-sided composite paperboard stack to increase the bonding force. The flipping mechanism 4 is used to flip the stack of single-sided composite cardboard after it has been processed by the tropospheric air curtain pressing mechanism 3 by 180 degrees and send it into the post-lamination machine 5. The post-lamination machine 5 is used to laminate single-sided composite paper with second color-printed cardboard 300 to form double-sided composite paperboard. The drying mechanism 6 is located at the paper output end of the post-laminating machine 5 and is used to dry and cure the double-sided composite paperboard.

[0033] The paper laminating machine of this invention adopts a modular and segmented production line layout. Through the cooperation and sequential operation of each functional unit, it realizes the full automation of the production process from single-sided lamination to double-sided composite paperboard.

[0034] This invention integrates a front laminator, a paper stacking device, a tropospheric air curtain pressing mechanism, a flipping mechanism, a rear laminator, and a drying and collecting mechanism into a continuous production line, realizing fully automated operation from the first side lamination to the second side lamination. It eliminates the intermediate product handling, temporary storage, manual flipping, and repeated feeding steps in traditional processes, significantly shortening the production cycle and improving overall production efficiency.

[0035] This invention uses a lifting and paper-receiving mechanism to receive and neatly stack single-sided composite cardboard, which is then processed in a stacked form. In this stacked state, the papers are mutually constrained, effectively suppressing free bending of individual sheets due to stress release or humidity changes, thus maintaining flatness.

[0036] This invention applies controllable pressure to the paper stack while simultaneously dehumidifying it through a uniform and controllable convection air curtain. Applying pressure helps to further flatten the paper and promotes the initial curing and shaping of the adhesive; simultaneous dehumidification accelerates the evaporation of moisture in the adhesive layer, reducing expansion differences caused by uneven moisture content, thereby significantly reducing the bending deformation of the single-sided composite paperboard. The single-sided composite paperboard treated by the flow-layer air curtain pressing mechanism can be used as a positioning point for the second lamination of the second color-printed cardboard 300, ensuring the alignment accuracy of the two sides of the color-printed cardboard and providing a dimensionally stable intermediate product for subsequent flipping and secondary lamination.

[0037] In this invention, because the deformation of the single-sided composite paperboard is effectively controlled, its un-laminated side can still maintain high flatness and dimensional stability after being flipped 180 degrees by the flipping mechanism. This makes the conveying and positioning more accurate when laminating the second color-printed cardboard on the subsequent laminating machine, greatly reducing the risk of misalignment of the front and back color-printed patterns due to substrate deformation, and ensuring the final appearance quality and decorative effect of the double-sided composite paperboard.

[0038] The entire process in this invention is highly automated, especially eliminating the heavy manual labor required in traditional processes to straighten and bend single-sided composite paperboard. The flipping mechanism automatically flips the entire paper stack, ensuring safety, precision, and efficiency, reducing the skill and physical demands on operators, and improving the working environment.

[0039] In this invention, the pressing and preliminary dehumidification processes of intermediate products are pre-positioned and integrated into the tropospheric air curtain pressing mechanism, reducing the load on the final drying and collection mechanism. During the final drying of the double-sided composite paperboard, the adhesive layer has already undergone a certain degree of curing, resulting in a relatively low moisture content. This facilitates faster drying, ensures uniform drying, and effectively reduces energy consumption.

[0040] The front laminating machine 1 of the present invention includes a front machine table 11, on which a first face paper conveying mechanism 12, a first back paper conveying mechanism 13, and a first coating and laminating mechanism 14 are arranged. The first face paper conveying mechanism 12 is used to convey first color printed card stock 100 to the first coating and laminating mechanism 14 one by one; the first back paper conveying mechanism 13 is used to convey back paper 200 to the first coating and laminating mechanism 14 one by one; the first coating and laminating mechanism 14 is used to first coat the upper surface of the back paper 200 with adhesive, and then laminating the first color printed card stock 100 onto the back paper 200.

[0041] The first face paper conveying mechanism 12 and the first back paper conveying mechanism 13 of the present invention are set independently, and the conveying parameters (such as speed and tension) can be adjusted independently for the different material characteristics, weight or size of the first color printing card 100 and the back paper 200, avoiding mutual interference and ensuring the stability of their respective material supply.

[0042] Both conveying mechanisms are designed to convey each sheet individually, ensuring that each sheet of base paper 200 and the first color printing card 100 can be delivered to the first coating and bonding mechanism 14 at a defined interval and in a defined posture. This allows for precise alignment and bonding, effectively preventing feeding failures such as double sheets, empty sheets, or misalignment.

[0043] The first coating and bonding mechanism 14 employs a process sequence of applying adhesive before bonding. First, adhesive is precisely applied to the upper surface of the base paper 200, allowing control over the amount, uniformity, and coating area to ensure adhesive layer quality. Then, the first color-printed cardstock 100 is smoothly pressed onto the adhesive-coated base paper 200. This facilitates better penetration of the paper fibers by the adhesive under pressure, forming a strong initial bond.

[0044] The first coating and bonding mechanism 14 of the present invention includes a coating machine base 141. An upper paper feed roller 142 and a lower paper feed roller 143 are symmetrically arranged in the vertical direction at the feed end of the coating machine base 141. One end of the upper paper feed roller 142 is connected to a first drive motor located on one side of the coating machine base 141. An upper adhesive coating roller 144 and a lower paper lifting roller 145 are symmetrically arranged in the vertical direction on the coating machine base 141 on the paper output end side of the upper paper feed roller 142. An adhesive quantity adjusting roller 146 is arranged on the coating machine base 141 near the upper paper feed roller 142 on the side of the upper adhesive coating roller 144. The adhesive quantity adjusting roller 146 and the upper adhesive coating roller 144 are rolled and abutted against each other, forming an adhesive storage area 147 above them. An adhesive conveying pipe is provided on the coating machine 141 to convey adhesive to the adhesive storage 147. A washing roller 148 is provided on the coating machine 141 near the lower paper lifting roller 145 on the side of the upper paper feeding roller 142. The washing roller 148 and the lower paper lifting roller 145 are rolled and attached to each other. An upper pressing steel roller 149 and a lower pressing steel roller 1410 are symmetrically arranged in the vertical direction on the coating machine 141 at the paper output end of the upper adhesive coating roller 144. A face paper bridge plate 1411 is provided on the coating machine 141 between the upper pressing steel roller 149 and the upper adhesive coating roller 144 to synchronously guide the first color printing card 100 and the base paper 200 into the face paper bridge plate between the upper pressing steel roller 149 and the lower pressing steel roller 1410.

[0045] The symmetrically arranged upper and lower paper feed rollers 142 and 143 of this invention can stably guide the base paper 200 and the first color printing cardstock 100 from different conveying paths, ensuring that they enter the coating area in a flat and aligned state. The symmetrically arranged upper and lower pressing steel rollers 149 and 1410 can apply uniform and controllable linear pressure to the laminated composite material, ensuring that the adhesive layer is fully impregnated and initially cured.

[0046] Adhesive is continuously supplied to the adhesive storage 147 through the adhesive delivery pipe. Combined with the rolling contact of the adhesive quantity adjustment wheel 146 and the upper adhesive coating wheel 144, a stable adhesive film transfer mechanism is formed, which can achieve precise control of adhesive quantity, coating width and uniformity.

[0047] A washing roller 148 is provided on one side of the lower paper roller 145, which rolls in contact with it. The lower paper roller can be cleaned during operation or when the machine is stopped to prevent the dripping adhesive from solidifying and accumulating, ensuring that the back of the cardboard and corrugated paper is clean and of stable quality, and reducing the frequency of manual cleaning and maintenance time.

[0048] The upper pressing steel roller 149 and the lower pressing steel roller 1410 are used as the pressing actuating elements. The steel rollers have the characteristics of high rigidity and resistance to deformation, which can ensure that uniform linear pressure is applied along the entire length of the roller body. This design allows the first color-printed cardboard 100 and the glued backing paper 200 to obtain sufficient and consistent pressing force when passing through the pressing zone, effectively eliminating air bubbles, enhancing bonding strength, and ensuring the flatness and interlayer bonding force of the composite paperboard.

[0049] The face paper bridge plate 1411, located between the upper pressing steel roller 149 and the upper adhesive coating roller 144, serves as a guide and synchronizing element. It can accurately guide the first color-printed cardstock 100 to the pressing entrance and synchronize its movement with the base paper 200 from the coating roller, ensuring that the two are basically aligned before entering the pressing roller, thus significantly reducing the probability of defects such as misalignment and wrinkling.

[0050] The first bottom paper conveying mechanism 13 of the present invention includes bottom paper support plates 131 spaced apart on a coating machine table 141. A drive roller 132 and a driven roller 133 are spaced apart between the two bottom paper support plates 131. The drive roller 132 is connected to a second drive motor mounted on the bottom paper support plate 131. A suction belt 134 is sleeved on the drive roller 132 and the driven roller 133. A suction box 135 is disposed within the suction belt 134. The suction box 135 is disposed on the bottom paper support plate 131 via a suction pipe 136. A bidirectional screw 137 is movably mounted on the bottom paper support plate 131 on one side of the paper feed end of the drive roller 132. A slide block 138 is mounted on the bidirectional screw 137, and a baffle is mounted on the slide block 138. A drive gear 139 is mounted inside the bottom paper support plate 131. The drive gear 139 is connected to a third drive motor. A transmission gear 1310 is mounted at one end of the bidirectional screw 137. The transmission gear 1310 meshes with the drive gear 139. A bottom paper baffle 1311 is mounted at the paper output end of the bottom paper support plate 131.

[0051] This invention constructs a stable conveying frame through spaced-apart base paper support plates 131. The driving roller 132 and driven roller 133 are positioned at opposite ends, forming a continuous conveyor belt surface via a suction belt 134 fitted onto them, providing a clear and flat conveying path for the base paper 200. This ensures that the base paper remains under controlled support and guidance throughout the entire process from feeding and conveying to discharging and reaching the coating station, effectively preventing drifting, sagging, or deviation during conveying, and ensuring the stability and reliability of the conveying process.

[0052] The suction box 135 generates negative pressure inside the suction belt 134, and the bottom paper 200 placed on the surface of the suction belt 134 is firmly adsorbed onto the belt surface by utilizing the micropores or gaps on the surface of the suction belt 134. The adsorption conveying method of the present invention effectively overcomes the problems of warping, wrinkling or displacement that may occur in the bottom paper due to insufficient rigidity, static electricity or airflow, and ensures that the bottom paper maintains good flatness and positional stability throughout the entire conveying process.

[0053] The design of the suction box 135 ensures that the negative pressure area covers the effective working width of the conveyor belt, providing uniform suction force and avoiding paper deformation or conveyor slippage caused by uneven local suction force.

[0054] The third drive motor drives the drive gear 139, which in turn drives the transmission gear 1310, thereby driving the bidirectional screw 137 to rotate. The two slides 138 mounted on the bidirectional screw 137 move synchronously towards or away from each other as the screw rotates. The baffles mounted on the slides 138 move accordingly, allowing for quick and precise adjustment of the guide width between the two baffles to accommodate base paper of different widths.

[0055] A bottom paper guide 1311 is set at the paper output end of the bottom paper support plate 131 to perform final lateral alignment and positioning of the bottom paper that is about to leave the conveying mechanism and enter the coating and bonding area. This can eliminate the slight lateral deviation that may accumulate during the conveying process, ensuring that the bottom paper is fed into the first coating and bonding mechanism 14 with a precise position and posture, and achieving high-precision bonding.

[0056] The first paper conveying mechanism 12 of the present invention includes symmetrically spaced paper support plates 121, a plurality of supporting beams 122 spaced from top to bottom between two paper support plates 121, a paper outlet is provided at the upper part of the paper support plate 121, a paper alignment rod 123 is provided at the paper outlet of the paper support plate 121, paper alignment pieces 124 are spaced on the paper alignment rod 123, a lifting rail 125 is provided inside the paper support plate 121, and a lifting platform 126 is provided inside the lifting rail 125. The lifting platform 126 is movably mounted on... A lifting drive mechanism is provided on the lifting track 125 inside the face paper support plate 121. The lifting platform 126 is connected to the lifting drive mechanism. A paper feeder 127 is provided on one side of the paper output end of the face paper support plate 121. Several pressure rollers 128 are spaced apart inside the paper feeder 127 along the paper movement direction. A connecting paper feeder frame composed of several spaced-apart bridge inclined plates 129 is provided between the paper output end of the paper feeder 127 and the paper input end of the first coating and bonding mechanism 14. Side air boxes 1210 are provided on both sides of the connecting paper feeder frame.

[0057] The lifting platform of this invention moves along the lifting track preset within the face paper support plate, ensuring the verticality and straightness of the lifting process and avoiding skewing or jamming during the lifting process.

[0058] The lifting platform is directly connected to the built-in lifting drive mechanism, which enables precise, stable and controllable lifting action. It can automatically adjust the lifting height according to the production rhythm to ensure that the top layer of paper is always in the appropriate paper picking position, realizing automated and continuous supply of paper, reducing manual intervention and improving production efficiency.

[0059] The paper alignment rods and spaced paper alignment pieces at the paper outlet effectively straighten the edges of the paper, preventing the paper from becoming skewed during output and ensuring that each sheet of paper enters the subsequent conveying process in a neat posture.

[0060] Several pressure rollers spaced apart along the paper movement direction inside the feeder can apply moderate and uniform pressure to the face paper during the conveying process. This not only promotes the smooth forward movement of the face paper but also helps prevent multiple sheets from sticking together or slipping during conveying, ensuring reliable separation and stable conveying of individual face papers.

[0061] The connecting paper feeder, composed of several spaced-apart inclined bridges, cleverly connects the paper output end with the paper feed end of the first coating and bonding mechanism, forming a continuous and stable transition conveying surface. This effectively avoids sagging, drifting, or jamming of the paper during inter-mechanism transfer due to insufficient support.

[0062] The side air boxes installed on both sides of the paper feeder can generate directional airflow (such as adsorption or auxiliary floating) to apply appropriate stabilizing effect to the two sides of the paper during the paper feeding process, further preventing the paper from deviating, wrinkling or floating during high-speed or long-distance feeding, and ensuring the flatness and positional accuracy of the paper when it is fed to the coating and bonding station.

[0063] The tropospheric air curtain pressing mechanism 3 of the present invention includes a tropospheric air curtain pressing chamber 31. The paper inlet end of the tropospheric air curtain pressing chamber 31 is connected to the paper outlet end of the paper stack processing device 2. A top pressure ceiling 32 is provided on the upper part of the tropospheric air curtain pressing chamber 31. A vertical paper pushing mechanism 33 is provided in the lower part of the tropospheric air curtain pressing chamber 31, which can make the single-sided composite paperboard stack press against the top pressure ceiling 32. A blower mechanism is provided in the tropospheric air curtain pressing chamber 31.

[0064] This invention achieves a seamless transition from stacking to pressing by directly connecting the air curtain pressing chamber to the paper stacking processing device, effectively reducing the risk of misalignment or damage during the paperboard transfer process and ensuring the continuity and stability of the production process.

[0065] The lower vertical paper-pushing mechanism lifts the paper stack upwards, forming a continuous bidirectional pressure with the upper fixed ceiling, ensuring a tight fit between the composite layers. At the same time, the uniform convection air curtain formed by the internal blower not only helps to exhaust air and reduce air bubbles, but also promotes uniform curing of the adhesive, significantly improving the flatness and bonding strength of the composite.

[0066] The vertical paper pushing mechanism can achieve smooth and adjustable lifting action, working in conjunction with the air curtain system to reduce human intervention. While ensuring consistent pressing quality, it also improves production efficiency and the level of automation in equipment operation.

[0067] In one embodiment of the blower mechanism described in this invention, a plurality of blower nozzles are spaced apart in the tropospheric air curtain pressing chamber 31, and the blower nozzles are connected to an external blower through an air supply pipe.

[0068] The paper stack processing device 2 of the present invention further includes a non-stop paper receiving mechanism 23; the non-stop paper receiving mechanism 23 is telescopically arranged below the paper output of the front laminator 1, and is used to temporarily receive paper during the descent and transfer of the lifting paper receiving mechanism 21.

[0069] One embodiment of the non-stop paper receiving mechanism 23 described in this invention includes a telescopic plate 231 and a telescopic cylinder 232 disposed within the front laminator 1. One end of the telescopic plate is connected to the telescopic cylinder. In this invention, a front baffle that can open left and right can also be disposed on the paper output end of the telescopic plate 231. A non-stop paper receiving mechanism is also disposed below the lamination paper output of the front laminator. This mechanism is characterized by its ability to extend and retract quickly. This non-stop paper receiving mechanism starts working when the lifting paper receiving mechanism rapidly descends and stops receiving paper. After the lifting paper receiving mechanism rapidly descends and stops receiving paper, it is responsible for receiving new single-sided composite paperboard laminated by the subsequent front laminator, and for pushing the single-sided composite paperboard stack away by the paper pushing mechanism, allowing the lifting paper receiving mechanism to rise back to its original receiving position for a buffer time. When the lifting paper receiving mechanism rises back to its original working position, the non-stop paper receiving mechanism quickly retracts to its preparatory working position, and simultaneously, the single-sided composite paperboard it received briefly falls downwards onto the lifting paper receiving mechanism. The lifting paper receiving mechanism, the paper pushing mechanism, and the non-stop paper receiving mechanism work alternately and cyclically.

[0070] The flipping mechanism 4 of the present invention includes a base 41, on which support vertical plates 42 are spaced apart. Gear disks 43 are respectively arranged on the inner side of the support vertical plates 42. A first drive gear 139 is arranged on the support vertical plate 42 on one side of the gear disk 43, and the first drive gear 139 meshes with the gear disk 43. A rotary drive motor 44 is arranged on the outer side of the support vertical plate 42, and the rotary drive motor 44 is connected to the first drive gear 139. Slide rails 45 are spaced apart on the gear disks 43, and upper sliders 46 and lower sliders 47 are spaced apart on the slide rails 45. First clamping plates 48 are arranged on the two upper sliders 46. A second clamping plate 49 is provided on the two lower sliding blocks 47. A first transmission rack 410 is provided on one side of the first clamping plate 48, and a second transmission rack 411 is provided on one side of the second clamping plate 49. A second drive gear 440 is provided on the gear turntable 43. The second drive gear 440 meshes with the first transmission rack 410 and the second transmission rack 411 respectively. A clamping drive motor 412 is provided on the outside of the support vertical plate 42. The clamping drive motor 412 is connected to the second drive gear 440. A flipping and pushing paper mechanism 40 is provided on the base 41 between the two support vertical plates 42, which can feed the flipped single-sided composite paperboard into the post-lamination machine 5.

[0071] The flipping and pushing paper mechanism 40 of the present invention includes linear guide rails 401 spaced apart on a base 41, a sliding seat 402 movably disposed on the linear guide rails 401, a movable platform 403 disposed on the sliding seat 402, an electric push rod 404 disposed on the movable platform 403, a push plate 405 disposed on the electric push rod 404, a long rack 406 fixedly disposed on the base 41, a paper pushing motor 407 fixedly disposed on the sliding seat 402 or the movable platform 403, a paper pushing gear 408 disposed on the paper pushing motor 407, and the paper pushing gear 408 meshing with the long rack 406.

[0072] The initial state of the flipping and pushing mechanism 40: The first and second clamping plates are open, forming an open parallel clamping space. The preceding conveyor line transports the neatly stacked single-sided composite cardboard to the space between the first and second clamping plates of the flipping mechanism. The clamping drive motor starts, driving the second drive gear to rotate. Since the second drive gear meshes with both the first and second transmission racks simultaneously, the rotation of the gear synchronously drives the upper and lower racks to move in opposite directions in a straight line. That is, the first clamping plate moves downward, and the second clamping plate moves upward. The two clamping plates move synchronously from the upper and lower sides of the cardboard stack towards the center until they firmly and evenly clamp the cardboard stack. This design ensures that the clamping force is centered, preventing the cardboard stack from sliding or tilting during subsequent flipping.

[0073] After the cardboard stack is reliably clamped, the rotary drive motor starts. The rotary drive motor drives the first drive gear to rotate via its output shaft. The first drive gear meshes with a large gear turntable. When the first drive gear drives the gear turntable to rotate, it causes all the components on it (including the clamped cardboard stack) to rotate together around the axis of the gear turntable.

[0074] The rotary drive motor rotates 180 degrees according to a preset program and then stops. At this point, the previously upward-facing laminated side becomes downward-facing, and the previously downward-facing unlaminated side becomes upward-facing, perfectly achieving the flipping of the cardboard stack. The gear meshing transmission method ensures precise flipping angles and a smooth process.

[0075] After the flipping action is completed, the clamping drive motor rotates in the opposite direction, driving the second drive gear to reverse, thereby causing the first and second clamping plates to separate synchronously in the opposite direction, releasing the clamp on the cardboard stack. The push plate of the flipping and pushing mechanism extends under the drive of the electric push rod, adjusting to a position matching the thickness of the cardboard stack, ready for pushing. The pusher motor starts, driving the pusher gear to rotate. The pusher gear meshes with a long rack fixed to the frame. Due to the meshing motion of the gear and rack, the entire sliding seat is driven to make precise linear movements along the linear guide rail.

[0076] The sliding seat moves forward, smoothly pushing the overturned cardboard stack through the push plate, causing it to leave the clamping station of the flipping mechanism and accurately enter the designated station of the post-lamination machine.

[0077] After the push is completed, the paper pusher motor reverses, causing the sliding seat and push plate to retract back to their original positions. At the same time, the clamping plate of the flipping mechanism remains open, and the rotary drive motor can selectively reset to its initial angle, waiting to receive the next batch of cardboard and begin the next work cycle.

[0078] The post-laminating machine 5 of the present invention includes a post-machine table 51, on which a second face paper conveying mechanism 52, a second back paper conveying mechanism 53, and a second coating and laminating mechanism 54 are provided. The second face paper conveying mechanism 52 is used to convey second color-printed cardboard 300 to the second coating and laminating mechanism 54 one by one. The second back paper conveying mechanism 53 is used to convey single-sided composite paperboard to the second coating and laminating mechanism 54 one by one. The second coating and laminating mechanism 54 is used to first coat the upper surface of the single-sided composite paperboard with adhesive, and then laminate the second color-printed cardboard 300 onto the single-sided composite paperboard.

[0079] The second face paper conveying mechanism 52, the second back paper conveying mechanism 53, and the second coating and bonding mechanism 54 described in this invention are similar in structure to the first face paper conveying mechanism 12, the first back paper conveying mechanism 13, and the first coating and bonding mechanism 14 described above, and will not be described again here.

[0080] The paper flipping and multi-layer lamination process of the present invention includes the following steps: S1. Front lamination: At the front lamination machine, the first color-printed cardboard is laminated with the corrugated paper and cardboard on one side to form a single-sided composite cardboard. S2, Stacking and Transfer: The single-sided composite paperboard continuously output in step S1 is stacked into a four-sided aligned paper stack through the coordinated action of the lifting paper receiving mechanism and the paper pushing mechanism. When the height of the paper stack reaches the set requirement, the paper pushing mechanism pushes the entire stack of paper to the next work station. S3. Pressing and dehumidification: The single-sided composite paperboard stack pushed in step S2 is sent into the convective air curtain pressing chamber. The stack is pressed upward by a liftable pressure platform, and at the same time, the stack is dehumidified by blowing air to enhance the initial tack and accelerate drying. S4. Flipping: Flip the stack of single-sided composite cardboard after step S3 by 180 degrees so that the first color-printed cardboard is facing down and the corrugated paper and cardboard are facing up. S5. Post-lamination: Apply glue to the top surface of the single-sided composite paperboard after it has been flipped in step S4, and then laminate it with the second color-printed cardboard fed from above to form a double-sided composite paperboard. S6. Drying and collecting: The double-sided composite paperboard obtained in step S5 is pressed, dried and then collected.

[0081] The drying mechanism 6 described in this invention is prior art and will not be elaborated here.

[0082] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A paper laminating machine, characterized in that... The system includes a front laminator (1), a paper stacking device (2), a tropospheric air curtain pressing mechanism (3), a flipping mechanism (4), a rear laminator (5), and a drying and collecting mechanism (6), arranged sequentially along the paper conveying direction. The front laminating machine (1) is used to laminate the first color-printed cardboard (100) to the base paper (200) on one side to form a single-sided composite paperboard; The paper stack processing device (2) is located at the paper output end of the front laminator (1), and includes a lifting paper receiving mechanism (21) and a longitudinal paper pushing mechanism (22). The lifting paper receiving mechanism (21) is used to receive and stack the single-sided composite paperboard output by the front laminator (1), and the longitudinal paper pushing mechanism (22) is used to push the stack of single-sided composite paperboard with the stack height meeting the standard to the tropospheric air curtain pressing mechanism (3). The tropospheric air curtain pressing mechanism (3) is set between the paper stack processing device (2) and the flipping mechanism (4) to pressurize and blow air to dehumidify the single-sided composite paperboard stack to increase the bonding force; The flipping mechanism (4) is used to flip the single-sided composite cardboard stack after it has been processed by the tropospheric air curtain pressing mechanism (3) by 180 degrees and send it into the post-lamination machine (5). The post-lamination machine (5) is used to laminate the single-sided composite paper that has been flipped 180 degrees to the second color-printed cardboard (300) to form a double-sided composite paperboard. The drying mechanism (6) is located at the paper output end of the post laminating machine (5) and is used to dry and cure the double-sided composite paperboard.

2. The paper laminating machine according to claim 1, characterized in that: The front laminating machine (1) includes a front machine table (11), on which a first face paper conveying mechanism (12), a first back paper conveying mechanism (13) and a first coating and laminating mechanism (14) are provided. The first face paper conveying mechanism (12) is used to convey first color printed cardstock (100) to the first coating and laminating mechanism (14) one by one. The first back paper conveying mechanism (13) is used to convey back paper (200) to the first coating and laminating mechanism (14) one by one. The first coating and laminating mechanism (14) is used to first apply adhesive to the upper surface of the back paper (200) and then laminate the first color printed cardstock (100) onto the back paper (200).

3. A paper laminating machine according to claim 2, characterized in that: The first coating and bonding mechanism (14) includes a coating machine (141). An upper paper feed roller (142) and a lower paper feed roller (143) are symmetrically arranged in the vertical direction at the feed end of the coating machine (141). One end of the upper paper feed roller (142) is connected to a first drive motor located on one side of the coating machine (141). An upper adhesive coating wheel (144) and a lower paper lifting wheel (145) are symmetrically arranged in the vertical direction on the coating machine (141) on the paper output end side of the upper paper feed roller (142). An adhesive quantity adjusting wheel (146) is arranged on the coating machine (141) on the side of the upper adhesive coating wheel (144) near the upper paper feed roller (142). The adhesive quantity adjusting wheel (146) and the upper adhesive coating wheel (144) roll against each other and form an adhesive storage area (147) above them. (141) is provided with an adhesive delivery pipe (1412) that can deliver adhesive to the adhesive storage area (147). A washing roller (148) is provided on the coating machine (141) on the side of the lower lifting paper roller (145) near the upper paper feeding roller (142). The washing roller (148) and the lower lifting paper roller (145) are rolled and attached to each other. The coating machine (141) is located at the paper exit end of the upper adhesive coating roller (144). 141) An upper pressing steel roller (149) and a lower pressing steel roller (1410) are symmetrically arranged along the upper and lower direction. A face paper bridge plate (1411) is provided on the coating machine table (141) between the upper pressing steel roller (149) and the upper adhesive coating wheel (144) to synchronously introduce the first color printing card paper (100) and the base paper (200) between the upper pressing steel roller (149) and the lower pressing steel roller (1410).

4. A paper laminating machine according to claim 3, characterized in that: The first bottom paper conveying mechanism (13) includes bottom paper support plates (131) spaced apart on the coating machine table (141). A drive roller (132) and a driven roller (133) are spaced apart between the two bottom paper support plates (131). The drive roller (132) is connected to a second drive motor mounted on the bottom paper support plate (131). A suction belt (134) is fitted onto the drive roller (132) and the driven roller (133). A suction box (135) is installed inside the suction belt (134). The suction box (135) is mounted on the bottom paper support plate (131) via a suction pipe (136). A bidirectional screw (137) is movably mounted on a bottom paper support plate (131) on one side of the paper feed end of the roller (132). A slide (138) is mounted on the bidirectional screw (137), and a baffle (1312) is mounted on the slide (138). A drive gear (139) is mounted inside the bottom paper support plate (131), and the drive gear (139) is connected to a third drive motor. A transmission gear (1310) is mounted at one end of the bidirectional screw (137), and the transmission gear (1310) meshes with the drive gear (139). A bottom paper baffle (1311) is mounted at the paper output end of the bottom paper support plate (131).

5. A paper laminating machine according to claim 2, characterized in that: The first paper conveying mechanism (12) includes symmetrically spaced paper support plates (121), with multiple supporting beams (122) spaced from top to bottom between the two paper support plates (121). A paper outlet is provided on the upper part of the paper support plate (121), and a paper alignment rod (123) is provided on the paper support plate (121) at the paper outlet. Paper alignment pieces (124) are spaced on the paper alignment rod (123). A lifting rail (125) is provided inside the paper support plate (121), and a lifting platform (126) is provided inside the lifting rail (125). The lifting platform (126) is movably set... The lifting platform (126) is connected to the lifting drive mechanism and is placed on the lifting track (125). A paper feeder (127) is provided on one side of the paper output end of the paper support plate (121). Several pressure rollers (128) are spaced apart in the paper feeder (127) along the paper movement direction. A connecting paper feeder frame composed of several spaced bridge inclined plates (129) is provided between the paper output end of the paper feeder (127) and the paper input end of the first coating and bonding mechanism (14). Side air boxes (1210) are provided on both sides of the connecting paper feeder frame.

6. A paper laminating machine according to claim 1, characterized in that: The tropospheric air curtain pressing mechanism (3) includes a tropospheric air curtain pressing chamber (31), the paper inlet end of the tropospheric air curtain pressing chamber (31) is connected to the paper outlet end of the paper stack processing device (2), a top pressure ceiling (32) is provided on the upper part of the tropospheric air curtain pressing chamber (31), a vertical paper pushing mechanism (33) is provided in the lower part of the tropospheric air curtain pressing chamber (31) to make the single-sided composite paperboard stack press against the top pressure ceiling (32) upward, and a blower mechanism is provided in the tropospheric air curtain pressing chamber (31).

7. A paper laminating machine according to claim 1, characterized in that: The paper stack processing device (2) also includes a non-stop paper receiving mechanism (23); the non-stop paper receiving mechanism (23) is telescopically arranged below the paper output of the front laminator (1) and is used to temporarily receive paper during the descent and transfer of the lifting paper receiving mechanism (21).

8. A paper laminating machine according to claim 1, characterized in that: The flipping mechanism (4) includes a base (41), on which support vertical plates (42) are spaced apart. Gear turntables (43) are respectively arranged on the inner side of the support vertical plates (42). A first drive gear (400) is arranged on the support vertical plate (42) on one side of the gear turntable (43). The first drive gear (400) meshes with the gear turntable (43). A rotary drive motor (44) is arranged on the outer side of the support vertical plate (42). The rotary drive motor (44) is connected to the first drive gear (400). Slide rails (45) are spaced apart on the gear turntable (43). Upper sliders (46) and lower sliders (47) are spaced apart on the slide rails (45). A first clamping plate (48) is arranged on the two upper sliders (46). A second clamping plate (49) is provided on the two lower sliding blocks (47). A first transmission rack (410) is provided on one side of the first clamping plate (48). A second transmission rack (411) is provided on one side of the second clamping plate (49). A second drive gear (440) is provided on the gear turntable (43). The second drive gear (440) meshes with the first transmission rack (410) and the second transmission rack (411) respectively. A clamping drive motor (412) is provided on the outside of the support vertical plate (42). The clamping drive motor (412) is connected to the second drive gear (440). A flipping and pushing paper mechanism (40) that can feed the flipped single-sided composite paperboard into the post-lamination machine (5) is provided on the base (41) between the two support vertical plates (42).

9. A paper laminating machine according to claim 1, characterized in that: The post-lamination machine (5) includes a post-machine table (51), on which a second face paper conveying mechanism (52), a second back paper conveying mechanism (53), and a second coating and laminating mechanism (54) are provided. The second face paper conveying mechanism (52) is used to convey second color-printed cardboard (300) to the second coating and laminating mechanism (54) one by one. The second back paper conveying mechanism (53) is used to convey single-sided composite paperboard to the second coating and laminating mechanism (54) one by one. The second coating and laminating mechanism (54) is used to apply adhesive to the horizontal upper surface of the single-sided composite paperboard after it has been flipped 180 degrees, and then laminating the second color-printed cardboard (300) onto the single-sided composite paperboard.

10. A multi-layer paper flipping and laminating process based on the paper laminating machine according to any one of claims 1-9, characterized in that... Includes the following steps: S1. Front lamination: At the front lamination machine, the first color-printed cardboard is laminated with the corrugated paper and cardboard on one side to form a single-sided composite cardboard. S2, Stacking and Transfer: The single-sided composite paperboard continuously output in step S1 is stacked into a four-sided aligned paper stack through the coordinated action of the lifting paper receiving mechanism and the paper pushing mechanism. When the height of the paper stack reaches the set requirement, the paper pushing mechanism pushes the entire stack of paper to the next work station. S3. Pressing and dehumidification: The single-sided composite paperboard stack pushed in step S2 is sent into the convective air curtain pressing chamber. The stack is pressed upward by a liftable pressure platform, and at the same time, the stack is dehumidified by blowing air to enhance the initial tack and accelerate drying. S4. Flipping: Flip the stack of single-sided composite cardboard after step S3 by 180 degrees so that the first color-printed cardboard is facing down and the corrugated paper and cardboard are facing up. S5. Post-lamination: Apply glue to the horizontal upper surface of the single-sided composite paperboard after it has been flipped in step S4, and then laminate it with the second color-printed cardboard fed from above to form a double-sided composite paperboard. S6. Drying and collecting: The double-sided composite paperboard obtained in step S5 is pressed, dried and then collected.

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