A corrugated paperboard production sizing process

Abstract

The application discloses a corrugated board production gluing process and relates to the technical field of corrugated board production. The corrugated board production gluing process comprises a glue roller, the glue roller comprises a glue pipe, a steam pipe, a segmented pipe and a coating pipe which are sequentially sleeved from inside to outside, a glue passage is formed in the glue pipe, a steam passage is formed between the glue pipe and the steam pipe, and the segmented pipe is separated into a steam cavity and a glue cavity by an annular partition plate. The glue pipe is arranged to internally guide glue, the segmented pipe and the coating pipe are matched to make the glue coated on the corrugated board by the glue roller in a segmented shape, and the amount of glue is saved; the steam pipe is arranged to guide steam, the glue in the glue pipe can be heated, glue condensation is avoided, the steam is sprayed onto the corrugated board to wet the corrugated board, the glue can flow and diffuse better, the amount of glue is reduced, and enough bonding area is ensured; and the rotary block is matched with the steam drainage pipe to quickly heat the condensed glue in the glue pipe and the glue cavity during long-time shutdown and production recovery.

Description

Technical Field

[0001] This invention relates to the field of corrugated paper production technology, specifically to a sizing process for corrugated cardboard production. Background Technology

[0002] Corrugated paper is a material made of three or more layers of laminated paperboard. It consists of at least two layers of linerboard and one layer of corrugated core, which provides additional strength and support, making corrugated paper a good cushioning material. Its thickness and stiffness can be adjusted as needed.

[0003] In the current corrugated paper production process, the base paper is first softened by heating with steam. Then, two corrugated rollers roll the base paper into a corrugated core. Next, a glue roller picks up glue from the glue tank and applies it to the core, bonding it to the face paper. To ensure that the glue picked up by the glue roller is evenly applied to the corrugated paper core, a glue-spreading roller that rotates synchronously with the glue roller is usually installed on one side of the glue roller. By controlling the gap between the glue-spreading roller and the glue roller, the glue picked up by the glue tank can be evenly applied to the surface of the glue roller.

[0004] like Figure 2 As shown, when existing corrugated rollers and glue-applying rollers are used together, the glue-applying roller applies glue along the length of the ridge line of the corrugated roller. This glue-applying method causes excess glue to spread along the corrugated ridge line of the paper core to the corrugated slope when the paper core is subsequently bonded to the face paper. On the one hand, this overflowing and spreading glue cannot bond with the face paper to enhance the bonding effect. On the other hand, the excessive use of glue is wasteful and detrimental to the environment.

[0005] In order to control the amount of glue applied and the degree of uniform glue coverage, some existing patents have proposed glue application methods different from traditional processes. For example, CN110560320A discloses a glue application roller for a corrugated machine, including a glue guiding mechanism and at least one glue application mechanism sleeved on the glue guiding mechanism. The glue application mechanism is connected to the glue guiding mechanism. The glue application mechanism includes a glue guiding column and a glue application block arranged around the glue guiding column. The glue application block is fixed on the glue guiding column. The glue guiding mechanism includes a dispersing glue guiding column and a hot glue conveying column. The dispersing glue guiding column is sleeved on the hot glue conveying column. The glue outlet of the hot glue conveying column is connected to the dispersing glue guiding column. During glue application, the glue is sequentially conveyed to the surface of the glue application block through the hot glue conveying column, the dispersing glue guiding column and the glue guiding column. This means that the glue does not need to adhere to the glue application roller through the outside of the glue box, saving the installation area of ​​the glue box. Unidirectional glue discharge can avoid the situation where the glue discharge of the entire glue application roller is difficult to control, and it is easy to control the amount of glue applied and the degree of uniform glue coverage.

[0006] However, when the gluing rollers of the aforementioned corrugating machine apply glue, they also apply glue to the surface of the paper core in a covering manner. Although the amount of glue applied is controlled, the glue on the corrugated paper core is still continuously distributed along the ridge line of the corrugating roller. Inevitably, it will be pressed into the corrugated slope during the subsequent bonding process with the face paper. Therefore, it is necessary to propose a gluing process that can more accurately control the amount of glue applied while ensuring the bonding strength between the paper core and the face paper, in order to improve the above-mentioned problems. Summary of the Invention

[0007] The purpose of this invention is to provide a gluing process for corrugated cardboard production to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] This invention provides a sizing process for corrugated cardboard production, comprising the following steps:

[0010] Step 1: Heat the base paper with steam;

[0011] Step 2: The base paper is rolled by corrugated rolls to obtain the corrugated paper core;

[0012] Step 3: Apply adhesive to the corrugated paper core using an adhesive application device;

[0013] Step 4: The corrugated paper core is bonded to the linerboard to obtain the finished corrugated paper;

[0014] The glue application equipment includes a glue application roller, which comprises, from the inside out, a glue tube, a steam tube, a segmented tube, and a coating tube. The glue tube is a hollow structure with one end open, forming a glue channel inside. A steam channel is formed between the glue tube and the steam tube. The segmented tube is divided into a steam chamber and a glue chamber by several annular baffles with opposite inclinations. Several glue guide tubes are provided on the side wall of the glue tube, and one end of the glue guide tube passes through the steam channel and extends into the glue chamber.

[0015] Furthermore, the side wall of the steam pipe is provided with a steam conduit spaced apart from the guide tube, and the other end of the steam conduit extends into the steam chamber.

[0016] Furthermore, the guide tube is provided with a first steam guide tube, one end of which is connected to the steam channel, and the other end of which is connected to the inside of the steam chamber through a second steam guide tube.

[0017] Furthermore, a rotating block is movably provided at one end of the guide tube inside the glue cavity. The rotating block has several guide holes extending in a spiral direction, and several stirring rods are provided at one end of the rotating block relative to the guide tube.

[0018] Furthermore, the glue tube has several first connection holes on its side wall, and the glue guide tube is threaded into the first connection holes.

[0019] Furthermore, a plurality of second connection holes are provided on the side wall of the steam pipe, and the steam conduit is threaded into the second connection holes.

[0020] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects:

[0021] This invention provides a sizing process for corrugated cardboard production:

[0022] 1. Set up a glue tube to draw glue from the inside, and use a segmented tube in conjunction with a coating tube to make the glue roller apply glue in interval segments on the corrugated paper, thus saving glue consumption while ensuring sufficient bonding area.

[0023] Setting up a steam pipe to guide steam not only heats the glue in the glue pipe, preventing it from condensing, but also allows the glue to flow and spread better after the steam is sprayed onto the corrugated paper and wets it. This reduces the amount of glue used while ensuring sufficient bonding area. Furthermore, steam is a commonly used energy source in corrugated paper production and has lower production costs compared to electric heating equipment.

[0024] By using a rotating block in conjunction with a steam inlet pipe, the glue guide tube and the condensed glue in the glue chamber can be quickly heated when resuming production after a long shutdown, enabling rapid production and improving production efficiency. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0026] In the attached diagram:

[0027] Figure 1 This invention provides a schematic diagram of the sizing process in the production of corrugated paper.

[0028] Figure 2 This is a schematic diagram of the structure of the glue application roller provided by the present invention;

[0029] Figure 3 An exploded view of the adhesive roller provided by the present invention;

[0030] Figure 4 This is a partial cross-sectional structural diagram of the adhesive roller provided by the present invention.

[0031] Figure 5 A front view of the cross-sectional structure of the adhesive roller provided by the present invention;

[0032] Figure 6for Figure 5 Enlarged view of point A in the middle;

[0033] Figure 7 This is a schematic diagram of another embodiment of the present invention;

[0034] Figure 8 A schematic diagram of the structure of another embodiment of the present invention;

[0035] Figure 9 This is a schematic diagram of the structure of the rotating block provided by the present invention.

[0036] In the picture:

[0037] 1. Coating tube; 2. Segmented tube; 21. Annular baffle; 22. Steam chamber; 23. Adhesive chamber; 3. Steam pipe; 31. Steam conduit; 32. Second connecting hole; 33. Steam channel; 4. Adhesive pipe; 41. Adhesive guide pipe; 42. First connecting hole; 43. Adhesive channel; 5. First steam guide pipe; 51. Second steam guide pipe; 6. Rotating block; 61. Adhesive guide hole; 62. Stirring rod. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present application.

[0039] Please see Figures 1 to 9 The present invention provides a sizing process for corrugated cardboard production, comprising the following steps:

[0040] Step 1: Heat the base paper with steam;

[0041] Step 2: The base paper is rolled by corrugated rolls to obtain the corrugated paper core;

[0042] Step 3: Apply adhesive to the corrugated paper core using an adhesive application device;

[0043] Step 4: The corrugated paper core is bonded to the linerboard to obtain the finished corrugated paper;

[0044] The gluing equipment includes a gluing roller, which includes a glue tube 4. A glue channel 43 is formed inside the glue tube 4. One end of the glue tube 4 is connected to a glue delivery pipe that communicates with the glue channel 43. Several first connection holes 42 are opened on the surface of the glue tube 4. During gluing, the glue overflows onto the surface of the glue tube 4 through the first connection holes 42 and adheres to the corrugated paper core after contacting it, thus completing the gluing process.

[0045] However, applying glue directly through glue tube 4 consumes a large amount of glue. In order to save production costs, factories mostly use industrial glue for gluing corrugated paper. Industrial glue contains organic solvents, formaldehyde, benzene and other substances that are harmful to the human body. A large amount of glue applied means a high content of harmful substances.

[0046] like Figures 3 to 5 As shown, a segmented tube 2 is fitted on the outside of the glue tube 4. The side wall of the segmented tube 2 is provided with annular partitions 21 that are inclined in opposite directions. These annular partitions 21 divide the surface of the segmented tube 2 into multiple glue cavities 23. The glue dots in the segmented manner are applied to the corrugated paper core along the ridge direction, which saves the amount of glue applied and ensures that the surface of the corrugated paper core is coated with glue with a sufficient bonding area to ensure the bonding strength.

[0047] like Figures 3 to 4 As shown, when the glue in the glue cavity 23 directly contacts the corrugated paper core, the amount of glue adhering to the corrugated paper core is uneven. This can easily lead to some areas having more glue adhering, causing glue to overflow into the recessed parts of the corrugated paper core and resulting in waste, while some areas have less glue adhering, resulting in weak adhesion. To address this, a coating tube 1 is sleeved on the outside of the segmented tube 2. The side wall of the coating tube 1 has relatively loose glue outlet holes with slightly larger diameters in the area corresponding to the glue cavity 23. This allows the glue in the glue cavity 23 to be filled and then evenly penetrate and coat the surface of the coating tube 1 through the glue outlet holes, thereby evenly coating the corrugated paper core with glue. By controlling the speed at which the glue is input through the glue delivery tube, the speed at which the glue penetrates to the surface of the coating tube 1 can be controlled, thereby controlling the thickness of the glue layer on the surface of the coating tube 1. Furthermore, only a sufficient amount of glue needs to be adhered to the crests of the corrugated paper core to meet the adhesion strength requirements, further reducing the amount of glue used.

[0048] like Figures 3 to 6 As shown, during the corrugated paper production process, if the raw paper roll runs out, a new raw paper roll needs to be replaced by automated equipment. This process takes a certain amount of time. To prevent the glue in the glue pipe 4 from condensing during the replacement of the raw paper roll and affecting the glue application after restarting, a steam pipe 3 is provided between the glue pipe 4 and the segment pipe 2, forming a steam channel 33. The end of the steam pipe 3 relative to the glue delivery pipe is connected to a steam delivery pipe that communicates with the steam channel 33. The steam contains a large amount of heat energy, which can keep the glue in the glue pipe 4 warm during the replacement of the raw paper roll. In the case of long-term shutdown, if the glue in the glue pipe 4 condenses, steam can be introduced to quickly heat up and liquefy the glue when restarting, thereby improving production efficiency.

[0049] Furthermore, such as Figures 4 to 6As shown, several steam conduits 31 are provided on the surface of the steam pipe 3 along the steam flow direction. The surface of the segmented pipe 2 is divided into glue cavities 23 by annular partitions 21. A steam cavity 22 is formed between two adjacent glue cavities 23. The other end of the steam conduit 31 extends into the steam cavity 22. Dense steam nozzles with small apertures are opened on the coating pipe 1 at the positions corresponding to the steam cavity 22, so that the steam in the steam cavity 22 can be sprayed onto the corrugated paper core through the steam nozzles during glue application, wetting the corrugated paper core in a point-to-point manner. The surface of the wetted corrugated paper core becomes rougher, and the glue can penetrate better, thereby increasing the bonding strength. In addition, the moisture can also make the glue flow and spread better, so that the glue originally applied in a point-to-point manner can spread to the steam-wetted areas on both sides, increasing the bonding area and further improving the bonding effect.

[0050] Furthermore, the steam in the steam channel 33 enters the steam chamber 22 through the steam conduit 31, causing the temperature in the steam chamber 22 to rise, which in turn causes the temperature of the annular baffles 21 on the two side walls of the steam chamber 22 to rise. The rise in the temperature of the annular baffles 21 causes the temperature of the adjacent glue chamber 23 to rise, preventing the glue in the glue chamber 23 from condensing during short shutdowns.

[0051] like Figures 4 to 6 As shown, a ring-shaped guide tube 41 is provided on the side wall of the glue tube 4. The steam conduit 31 and the guide tube 41 are distributed alternately. The guide tube 41 passes through the steam tube 3 and extends into the glue cavity 23. As glue is continuously fed into the glue channel 43 by the glue delivery tube, the pressure in the glue channel 43 increases. The glue is pressurized and enters the glue cavity 23 through the guide tube 41, and then is evenly coated onto the surface of the coating tube 1 through the glue outlet.

[0052] For ease of installation, both the glue guide tube 41 and the steam conduit 31 are threaded and have internal hexagonal holes at their ends to facilitate installation by workers using tools. The glue guide tube 41 is threaded to the first connection hole 42 on the glue tube 4, and the steam conduit 31 is threaded to the second connection hole 32 on the side wall of the steam tube 3.

[0053] However, sometimes the downtime is too long, and the glue in the glue chamber 23 is completely condensed. When the machine is restarted, steam enters the steam chamber 22, which raises the temperature of the adjacent glue chamber 23, causing the glue to gradually melt. However, because the temperature penetrates from the periphery to the center, the glue at the periphery melts and flows first, while the glue in the center located at the glue guide tube 41 melts more slowly and still blocks the glue guide tube 41, affecting production efficiency.

[0054] Therefore, such as Figure 7As shown, in one embodiment of this application, a first steam guide tube 5 is provided inside the adhesive guide tube 41. The first steam guide tube 5 is processed into a C-shape. One end of the first steam guide tube 5 penetrates the side wall of the adhesive guide tube 41 and communicates with the steam channel 33. The other end is communicated with the second steam guide tube 51 located in the steam chamber 22. When the machine is restarted after a long period of shutdown, the steam in the steam channel 33 enters the first steam guide tube 5 in the adhesive guide tube 41 and enters the steam chamber 22 through the first steam guide tube 5 and the second steam guide tube 51. Finally, it is sprayed onto the corrugated paper through the coating tube 1. When the steam flows in the first steam guide tube 5, it works with the steam in the steam channel 33 and the steam in the steam chamber 22 to provide double heating for the adhesive in the adhesive guide tube 41 and the adhesive chamber 23, thereby accelerating the melting speed of the adhesive.

[0055] Furthermore, such as Figures 8 to 9 As shown, in another embodiment of this application, a rotating block 6 is movably mounted on one end of the glue guide tube 41 located in the glue cavity 23. The rotating block 6 has glue guide holes 61 arranged in a circumferential array and extending in a spiral direction. A plurality of stirring rods 62 are provided at one end of the rotating block 6 relative to the glue guide tube 41. When the glue in the glue guide tube 41 flows into the glue cavity 23 under pressure, the pressurized glue drives the rotating block 6 to rotate through the glue guide holes 61 on the rotating block 6, which in turn drives the stirring rods 62 to rotate, stirring the glue in the glue cavity 23, so that the melted glue and the glue that has not been completely melted are fully mixed and heat exchanged, further improving the glue melting speed and reducing the impact of glue condensation caused by machine stoppage on production efficiency.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A sizing process for corrugated cardboard production, characterized in that: Includes the following steps: Step 1: Heat the base paper with steam; Step 2: The base paper is rolled by corrugated rolls to obtain the corrugated paper core; Step 3: Apply adhesive to the corrugated paper core using an adhesive application device; Step 4: The corrugated paper core is bonded to the linerboard to obtain the finished corrugated paper; The glue application equipment includes a glue application roller, which includes a glue pipe (4), a steam pipe (3), a segmented pipe (2) and a coating pipe (1) arranged sequentially from the inside to the outside. The glue pipe (4) is a hollow structure with one end open, forming a glue channel (43) inside. A steam channel (33) is formed between the glue pipe (4) and the steam pipe (3). The segmented pipe (2) is divided into a steam chamber (22) and a glue chamber (23) by several annular baffles (21) with opposite inclinations. Several glue guide pipes (41) are provided on the side wall of the glue pipe (4). One end of the glue guide pipe (41) passes through the steam channel (33) and extends into the glue chamber (23).

2. The sizing process for corrugated cardboard production according to claim 1, characterized in that: The side wall of the steam pipe (3) is provided with a steam conduit (31) spaced apart from the guide tube (41), and the other end of the steam conduit (31) extends into the steam chamber (22).

3. The sizing process for corrugated cardboard production according to claim 1, characterized in that: The guide tube (41) is provided with a first steam guide tube (5). One end of the first steam guide tube (5) is connected to the steam channel (33), and the other end of the first steam guide tube (5) is connected to the inside of the steam chamber (22) through the second steam guide tube (51).

4. The sizing process for corrugated cardboard production according to claim 3, characterized in that: The guide tube (41) is located inside the glue cavity (23) and has a rotating block (6) at one end. The rotating block (6) has several guide holes (61) extending in a spiral direction. The rotating block (6) has several stirring rods (62) at one end relative to the guide tube (41).

5. The sizing process for corrugated cardboard production according to claim 1, characterized in that: The glue tube (4) has several first connection holes (42) on its side wall, and the glue guide tube (41) is threaded into the first connection holes (42).

6. The sizing process for corrugated cardboard production according to claim 2, characterized in that: The steam pipe (3) has several second connection holes (32) on its side wall, and the steam conduit (31) is threaded into the second connection holes (32).

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