High-bonding-strength compact paperboard compounding device

Abstract

The invention discloses a high-bonding-strength compact paperboard compounding device which comprises a first conveying roller and a second conveying roller which are used for conveying bonded and compounded paperboards, two kinds of conveying paths are provided, the first conveying path comprises the bottom end and the top end of the first conveying roller and the bottom end and the top end of the second conveying roller, and the conveying paths of the first conveying roller and the second conveying roller are in an S shape; according to the second type, the bottom end and the top end of the first conveying roller, the top end and the bottom end of the second conveying roller and the conveying path of the first conveying roller and the second conveying roller are linear; the paperboard enters the first heating area for activating the glue layer before being conveyed to the input end of the second conveying roller, and enters the second heating area for curing the glue layer after being conveyed to the output end of the second conveying roller. The space is saved, the final curing bonding force of the glue layer is promoted, the peeling strength is improved, and the internal stress of the paperboard is reduced.

Description

Technical Field

[0001] This application relates to the field of paperboard production technology, specifically to a compact paperboard laminating device with high bonding strength. Background Technology

[0002] Currently, all types of paperboard laminating machines require lamination time; that is, after the paper is glued, a certain amount of time is needed for it to bond and form paperboard, generating adhesive force. Typically, due to workshop length limitations, the transfer length and time of the glued paper into the high-temperature drying zone are relatively short. This causes the water molecules in the glue within the paperboard to evaporate and vaporize quickly, generating steam. Consequently, the glue surface inside the paperboard may separate, reducing the yield rate of the finished paperboard and increasing production costs.

[0003] Therefore, this application is submitted. Summary of the Invention

[0004] The purpose of this invention is to provide a compact paperboard composite device with high bonding strength. By setting the paperboard between the first and second conveyor rollers as two space-saving transmission paths, and setting two heating zones with different temperatures, the second heating zone has a higher temperature than the first heating zone. The first heating zone is used to activate the adhesive layer, while the second heating zone is used for evaporation and vaporization in the adhesive layer to achieve curing. This improves the bonding strength of the paperboard and avoids problems such as adhesive separation.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following solution: A high-bonding-strength compact paperboard laminating device includes a first conveyor roller and a second conveyor roller for conveying the bonded and laminated paperboard. The conveying path has two types: the first type is the bottom and top of the first conveyor roller and the bottom and top of the second conveyor roller, with the conveying path of the first and second conveyor rollers being S-shaped; the second type is the bottom and top of the first conveyor roller and the top and bottom of the second conveyor roller, with the conveying path of the first and second conveyor rollers being straight. Before the cardboard is conveyed to the input end of the second conveyor roller, it enters the first heating zone for activating the adhesive layer. After the cardboard is conveyed to the output end of the second conveyor roller, it enters the second heating zone for curing the adhesive layer.

[0006] Furthermore, the temperature of the first heating zone is lower than the temperature of the second heating zone.

[0007] Furthermore, the first heating zone is divided into a preheating zone, a main heating zone, and a transition zone in sequence by partitions according to the paperboard conveying path. The temperature of the main heating zone is higher than that of the preheating zone and the transition zone, respectively.

[0008] Furthermore, the top and bottom of the entrance to the preheating zone are respectively provided with infrared radiation heaters that penetrate the surface of the cardboard and reach the glue layer. The infrared radiation heaters are connected to the interior of the first heating zone through hydraulic rods.

[0009] Furthermore, annular heat-conducting pipes for transmitting hot air are respectively installed inside the preheating zone, the main heating zone, and the transition zone, and multiple nozzles are evenly arranged on the inner wall of the annular heat-conducting pipes.

[0010] Furthermore, the nozzle is a Venturi nozzle.

[0011] Furthermore, the top end of the annular heat-conducting pipe is connected to the air outlet of the heater, and its bottom end is provided with a connecting rod that is fixedly connected to the inner wall of the first heating zone.

[0012] Furthermore, the heater has an air inlet at the top that communicates with an external fan, and at least two air outlets.

[0013] Furthermore, the interior of the second heating zone is divided into an entrance zone and a curing zone with gradually increasing heating temperature by the cardboard transport path.

[0014] Furthermore, the outlet end of the curing zone is connected to a slow cooling box equipped with a cooler at the top, and the temperature of the slow cooling box is half the temperature of the curing zone.

[0015] The beneficial effects of this invention are as follows: On the one hand, there are two types of transmission paths between the first and second conveying rollers: one is S-shaped and the other is straight. Both are conducive to saving space, improving space utilization, and extending the transmission distance and time of the composite paperboard between the first and second conveying rollers. This allows the adhesive layer in the paperboard to be fully activated after entering the first heating zone, improving the subsequent initial bonding effect and avoiding the direct evaporation and vaporization of water molecules in the adhesive layer when it directly enters the first heating zone, which would cause the adhesive surface in the paperboard to separate.

[0016] On the other hand, a first heating zone and a second heating zone are respectively set at the input and output ends of the second conveying roller in the two transmission paths. The temperature of the second heating zone is higher than that of the first heating zone, so that the paperboard undergoes activation of the glue layer, initial bonding, and evaporation of water molecules in the glue layer to solidify the glue layer in sequence, and then transitions to a slow cooling box to reduce the temperature difference between the curing zone and room temperature, reduce the internal stress of the paperboard, improve the dimensional stability of the paperboard, ensure the flatness of the roll, promote the final curing and bonding of the glue layer, and improve the peel strength. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the first transmission path of the paperboard of the present invention; Figure 2 This is a schematic diagram of the second transport path for the paperboard of the present invention; Figure 3 This is a schematic diagram of the structure of the first heating zone of the present invention; Figure 4 This is a side view of the first heating zone of the present invention. Figure 5 This is a schematic diagram of the structure of the second heating zone of the present invention.

[0018] Reference numerals: 1-Paper frame machine, 2-Glue applicator, 3-Adhesive bonding machine, 4-First conveyor roller, 5-Second conveyor roller, 6-First heating zone, 60-Preheating zone, 600-Hydraulic rod, 601-Infrared radiation heater, 61-Main heating zone, 62-Transition zone, 63-Baffle plate, 64-Annular heat-conducting pipe, 65-Nozzle, 66-Heater, 660-Air inlet, 661-Air outlet, 67-Connecting rod, 7-Second heating zone, 70-Inlet zone, 71-Curing zone, 8-Roller cutter, 9-Slow cooling box, 90-Cooler. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0021] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0022] Furthermore, for clarity and brevity, descriptions of well-known structures, functions, and configurations may have been omitted. Those skilled in the art will recognize that various changes and modifications can be made to the examples described herein without departing from the spirit and scope of this disclosure.

[0023] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0024] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0025] Example 1 Embodiment 1 of the present invention is a high-bonding-strength compact paperboard laminating device, including a first conveying roller 4 and a second conveying roller 5 for conveying the bonded and laminated paperboard. There are two types of conveying paths: the first type is the bottom and top ends of the first conveying roller 4 and the bottom and top ends of the second conveying roller 5, and the conveying path of the first conveying roller 4 and the second conveying roller 5 is S-shaped; the second type is the bottom and top ends of the first conveying roller 4 and the top and bottom ends of the second conveying roller 5, and the conveying path of the first conveying roller 4 and the second conveying roller 5 is straight. Before the cardboard is conveyed to the input end of the second conveyor roller 5, it enters the first heating zone 6 for activating the adhesive layer. After the cardboard is conveyed to the output end of the second conveyor roller 5, it enters the second heating zone 7 for curing the adhesive layer. The temperature of the first heating zone 6 is lower than the temperature of the second heating zone 7.

[0026] Reference Figure 1 and Figure 2 The device includes two parallel paper stackers 1 and a gluing machine 2. The paper on the paper stacker 1 is transferred to the gluing machine 2 for gluing. After being bonded into paperboard by the bonding machine 3, the paperboard is activated and the moisture in the glue layer is evaporated by the first conveying roller 4 and the second conveying roller 5 with an S-shaped transmission path. The glue layer is then cured. After the paperboard passes through the wheel cutter 8, it is ready for use.

[0027] in, Figure 1 This is the first transport path for cardboard. Figure 2 The second conveying path for the cardboard involves changing the conventional straight-line path between the first conveyor roller 4 and the second conveyor roller 5 to an S-shaped or a meandering straight path. In the straight-line path, the cardboard is conveyed from the top of the first conveyor roller 4 to the top of the second conveyor roller 5, and then from the bottom of the second conveyor roller 5 to the wheel cutter 8 for slitting. In this case, the first conveyor roller 4 and the second conveyor roller 5 are positioned opposite each other, instead of the conventional placement method, where the paper frame machine 1, gluing machine 2, bonding machine 3, first conveyor roller 4, and second conveyor roller 5 are arranged in a straight line. The two conveying paths in this invention save at least half the space in a workshop with limited length, thereby extending the conveying distance and time between the first conveyor roller 4 and the second conveyor roller 5 after lamination. This allows for sufficient initial bonding of the adhesive layer within the cardboard before it enters the first heating zone 6, preventing the direct evaporation and vaporization of water molecules within the adhesive layer upon entering the first heating zone 6, which could cause the adhesive surface within the cardboard to detach. Meanwhile, a first heating zone 6 and a second heating zone 7 are respectively set before and after the second conveying roller 5. The first heating zone 6 is mainly used to activate the glue. Under the pressing action of the second conveying roller 5 and its own belt, the glue produces an initial tack inside the paperboard. When it is transferred to the second heating zone 7, the water molecules in the glue inside the paperboard are evaporated and vaporized to completely solidify the glue, thereby improving the bonding strength of the paperboard.

[0028] The temperatures of the first heating zone 6 and the second heating zone 7 are limited here. The temperature of the first heating zone 6 is 80~90℃. The cardboard is at room temperature when it enters the first heating zone 6. If the temperature is too high, the water molecules in the internal adhesive layer will evaporate and vaporize directly, reducing the bonding strength of the cardboard. The temperature of the second heating zone 7 is greater than 100℃. The second heating zone 7 reinforces the cardboard that has been activated by the adhesive layer in the first heating zone 6. Since water molecules will evaporate and vaporize at temperatures above 100℃, the water molecules inside the adhesive layer will evaporate rapidly, thereby quickly curing, accelerating the curing speed and improving the bonding strength.

[0029] In some preferred embodiments, the first heating zone 6 is divided into a preheating zone 60, a main heating zone 61 and a transition zone 62 in sequence by a partition 63 according to the paperboard conveying path. The temperature of the main heating zone 61 is higher than that of the preheating zone 60 and the transition zone 62, respectively.

[0030] Reference Figure 3 The first heating zone 6 is divided into three zones for the transition of the cardboard from room temperature to the heating temperature and during discharge. The top and bottom of the inlet of the preheating zone 60 are respectively equipped with infrared radiation heaters 601 that penetrate the cardboard surface and reach the adhesive layer. The infrared radiation heaters 601 are connected to the interior of the first heating zone 6 via hydraulic rods 600. The temperature difference between the preheating zone 60 and the heating temperature is large, requiring rapid heating. Therefore, the preheating zone 60 needs to provide the maximum heat required for the temperature difference change, maximizing the energy of the preheating zone 60. The energy of the main heating zone 61 and the transition zone 62 decreases sequentially.

[0031] The infrared radiation heater 601 can be short-wave or medium-long-wave, and can directly heat the adhesive layer inside the cardboard conveyed to the inlet. Infrared heating can instantly penetrate the surface of the material and directly heat the adhesive layer, achieving rapid heating from the inside out, significantly shortening the adhesive activation time, and thus allowing the adhesive to fully contact the inside of the cardboard. Meanwhile, the preheating zone 60 has a slightly lower temperature and is mainly used for temperature preheating; the main heating zone 61 has the highest temperature and is used to improve the subsequent initial bonding effect; the transition zone 62 has a slightly lower temperature and is used to smoothly transition to the top of the second conveyor roller to enter the second heating zone 7 for adhesive layer curing.

[0032] In some preferred embodiments, annular heat-conducting pipes 64 for transmitting hot air are respectively provided inside the preheating zone 60, the main heating zone 61, and the transition zone 62. Multiple nozzles 65 are evenly arranged on the inner wall of the annular heat-conducting pipes 64. The nozzles 65 are Venturi nozzles.

[0033] Specifically, the heating of the cardboard in the preheating zone 60, main heating zone 61, and transition zone 62 is mainly achieved through hot air transmitted by the annular heat pipe 64. The annular heat pipe 64 transmits the heated hot air to the output end of the Venturi nozzle 65, thereby uniformly heating the cardboard around its perimeter and preventing deformation due to uneven heating. The Venturi nozzle 65 generates a high-speed, uniform airflow, forming a stable air knife layer on the cardboard surface, which not only efficiently transfers heat but also blows away trace amounts of volatiles generated on the cardboard surface during heating.

[0034] Meanwhile, the number of nozzles 65 can be set according to actual needs, and the angle is adjustable. This is the current technology, which ensures that hot air covers the entire width of the cardboard, eliminates the temperature difference between the edge and center of the cardboard, and improves heating efficiency.

[0035] Reference Figure 4 The heating of the hot air is mainly achieved by the heater 66. The top end of the annular heat-conducting pipe 64 is connected to the air outlet 661 of the heater 66, and the bottom end is provided with a connecting rod 67 fixed to the inner wall of the first heating zone 6. The top of the heater 66 is provided with an air inlet 660 connected to an external fan, and the number of air outlets 661 is at least two. The air inlet 660 transmits outside air to the heater 66 for heating, and then transmits it to the annular heat-conducting pipe 64 through the air outlet 661, where it is sprayed out by the nozzle 65 for heating.

[0036] Example 2 Based on Example 1, the interior of the second heating zone 7 is divided into an inlet zone 70 and a curing zone 71, with the heating temperature gradually increasing, by a cardboard transport path. The outlet end of the curing zone 71 is connected to a slow cooling box 9 with a cooler 90 on top, and the temperature of the slow cooling box 9 is half the temperature of the curing zone 71.

[0037] Reference Figure 5 The second heating zone 7 has two heating zones: an inlet zone 70 and a curing zone 71. The inlet zone 70 performs initial curing, while the curing zone 71 performs final curing, ensuring the cardboard is thoroughly cured. This causes water molecules in the adhesive layer to evaporate and vaporize. After passing through the slow cooling box 9, the internal stress of the cardboard is reduced, improving its dimensional stability, ensuring a flat roll shape, increasing the product yield, and reducing the temperature difference between the curing zone 71 and room temperature, thus promoting the final curing of the adhesive layer and improving peel strength. The cooler 90 is existing technology and will not be described in detail here.

[0038] The working principle of this invention is as follows: During use, after being laminated into cardboard by the bonding machine 3, the cardboard passes through a first conveyor roller 4 and a second conveyor roller 5 with an S-shaped or straight transmission path. This saves space and extends the conveying distance and time between the laminated cardboard and the first and second conveyor rollers 5, allowing the adhesive layer inside the cardboard to be fully activated after entering the first heating zone 6. Under the pressure of the second conveyor roller 5 and its own belt, initial adhesion is achieved, avoiding direct evaporation and vaporization of water molecules within the adhesive layer in the first heating zone 6, which could cause the adhesive surface inside the cardboard to detach. The first heating zone 6 and the second heating zone 7 are respectively located at the input and output ends of the second conveyor roller 5. The temperature of the second heating zone 7 is higher than that of the first heating zone 6, allowing the cardboard to sequentially undergo adhesive layer activation, initial adhesion, and evaporation and vaporization of water molecules in the adhesive layer to solidify the adhesive layer. Afterward, it transitions to the slow cooling box 9, reducing the temperature difference between the curing zone 71 and room temperature, reducing the internal stress of the cardboard, improving the dimensional stability of the cardboard, ensuring a flat roll shape, promoting the final curing and bonding strength of the adhesive layer, and improving peel strength.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A high-bonding-strength compact paperboard composite device, characterized in that, It includes a first conveyor roller (4) and a second conveyor roller (5) for conveying the bonded and laminated paperboard. There are two types of conveying paths. The first type is the bottom and top of the first conveyor roller (4) and the bottom and top of the second conveyor roller (5), and the conveying path of the first conveyor roller (4) and the second conveyor roller (5) is S-shaped. The second type is the bottom and top of the first conveyor roller (4) and the top and bottom of the second conveyor roller (5), and the conveying path of the first conveyor roller (4) and the second conveyor roller (5) is straight. Before the cardboard is conveyed to the input end of the second conveyor roller (5), it enters the first heating zone (6) for activating the adhesive layer. After the cardboard is conveyed to the output end of the second conveyor roller (5), it enters the second heating zone (7) for curing the adhesive layer.

2. The high-bonding-strength compact paperboard composite device according to claim 1, characterized in that, The temperature of the first heating zone (6) is lower than the temperature of the second heating zone (7).

3. The high-bonding-strength compact paperboard composite device according to claim 1, characterized in that, The first heating zone (6) is divided into a preheating zone (60), a main heating zone (61) and a transition zone (62) in sequence by a partition (63) according to the paperboard conveying path. The temperature of the main heating zone (61) is higher than that of the preheating zone (60) and the transition zone (62).

4. The high-bonding-strength compact paperboard composite device according to claim 3, characterized in that, The preheating zone (60) is provided with infrared radiation heaters (601) at the top and bottom of the entrance, which penetrate the cardboard surface and reach the glue layer. The infrared radiation heaters (601) are connected to the interior of the first heating zone (6) through a hydraulic rod (600).

5. A high-bonding-strength compact paperboard composite device according to claim 3, characterized in that, Annular heat-conducting pipes (64) for transmitting hot air are respectively installed inside the preheating zone (60), the main heating zone (61) and the transition zone (62), and multiple nozzles (65) are uniformly arranged on the inner wall of the annular heat-conducting pipes (64).

6. A high-bonding-strength compact paperboard composite device according to claim 5, characterized in that, The nozzle (65) is a Venturi nozzle (65).

7. A high-bonding-strength compact paperboard composite device according to claim 5, characterized in that, The top end of the annular heat pipe (64) is connected to the air outlet (661) of the heater (66), and the bottom end is provided with a connecting rod (67) that is fixed to the inner wall of the first heating zone (6).

8. A high-bonding-strength compact paperboard composite device according to claim 7, characterized in that, The heater (66) has an air inlet (660) at the top that communicates with an external fan, and at least two air outlets (661).

9. A high-bonding-strength compact paperboard composite device according to claim 7, characterized in that, The interior of the second heating zone (7) is divided into an entrance zone (70) and a curing zone (71) with gradually increasing heating temperature by the paperboard transport path.

10. A high-bonding-strength compact paperboard composite device according to claim 9, characterized in that, The outlet end of the curing zone (71) is connected to a slow cooling box (9) with a cooler (90) on top, the temperature of which is half the temperature of the curing zone (71).

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