A production process for preventing the occurrence of a leakage mark on the base paper

Abstract

The present application relates to the technical field of carton production, and discloses a production process for preventing corrugated paper from being deformed, comprising the following steps: step one, forming a baking angle between the outer surface of the corrugated heating roller and the surface of the raw paper, adjusting the baking angle according to the environmental temperature and humidity of the day, and the pressure of the corrugated heating roller on the raw paper is controlled in the range of 48%-50%; step two, the corrugated paper paste drying assembly is provided with at least one set of heating pressure plates for bonding and heating the corrugated paper and the box board paper to form multi-layer corrugated paper, the heating pressure plates are used to generate air pressure by pressing the multi-layer corrugated paper, the air pressure of the heating pressure plates is used to continuously apply different stages of temperature to the corrugated paper board, the corrugated core board in the corrugated paper board is gradually formed at the top of the corrugated core board, and the box board paper is dried to form multi-layer corrugated paper. The present application can solve the technical problem that the corrugated core board is deformed and wrinkled at the top of the corrugated core board, and the corrugated paper is deformed.

Description

Technical Field

[0001] This invention relates to the technical field of cardboard box production, and specifically to a production process for preventing creases and indentations in the base paper. Background Technology

[0002] Corrugated cardboard is made by corrugating base paper to form a wavy corrugated core, and then gluing linerboard to the top and bottom of the core with adhesive to form a thick sheet of paper. Generally, corrugated cardboard is thicker than 0.1mm and has a basis weight of 250g / m³. 2 The above describes how corrugated cardboard boxes are formed by folding corrugated cardboard to create a box structure. Corrugated cardboard boxes, with their superior performance and good processing properties, have gradually replaced wooden boxes and other transport packaging containers, becoming the mainstay of transport packaging.

[0003] In the production process of corrugated paperboard from corrugated base paper, the purchased corrugated base paper is corrugated to form a wavy corrugated core paper. After the corrugated core paper is coated with adhesive, the linerboard above and below the corrugated core paper is pressed into shape by the hot plate of the gluing machine. However, in actual use, our company has found that: because our company is located in Chongqing, which has a subtropical monsoon climate, the humidity in Chongqing is high all year round. When producing corrugated paperboard, the adhesive absorbs the moisture in the factory environment, which reduces the adhesive strength.

[0004] Therefore, when applying adhesive to the corrugated core paper, the amount of adhesive applied is increased to ensure the adhesion of the adhesive. This causes a sudden increase in the moisture content of the adhesive, which seeps into the corrugated core paper until it absorbs water, expands, and deforms. When the corrugated core paper and the linerboard above and below it are dried by the hot plate of the gluing machine, the corrugated core paper is pressed against the linerboard, deforming and wrinkling, resulting in missing corrugations. In addition, during the pressing process of the hot plate of the gluing machine, because the moisture in the adhesive seeps into the corrugated core paper, the pressing time of the hot plate of the gluing machine needs to be increased, resulting in indentations on the corrugated paper. Summary of the Invention

[0005] The present invention aims to provide a production process to prevent corrugation and indentation in the base paper, in order to solve the technical problem that when the corrugated core board and the linerboard above and below the corrugated core board are dried by the hot plate of the gluing machine, the corrugated top of the corrugated core board is pressed and deformed by the linerboard, resulting in corrugation leakage.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: 1) A production process for preventing indentation marks on raw paper, comprising the following steps: Step 1: A multi-stage corrugating machine is evenly set up along the carton production conveyor direction. Each stage of the corrugating machine has at least one set of corrugating heating rollers that bite and heat the surface of the original paper to form corrugations. One or more stages of the corrugating machine are started according to design requirements, so that the outer surface of the corrugating heating roller of each stage forms a baking angle with the surface of the original paper. The baking angle is adjusted according to the ambient temperature and humidity of the day. The pressure of the corrugating heating roller on the surface of the original paper is adjusted within a range of 48%-50%. Step two: A corrugated paper paste drying assembly is installed after all corrugators along the conveying direction. The corrugated paper paste drying assembly has at least one set of heating plates for bonding and heating corrugated paper and linerboard to form multi-layer corrugated paper. The multi-layer corrugated paper is bonded and heated in the corrugated paper paste drying assembly to form corrugated board. The heating plates apply pressure to the multi-layer corrugated paper to generate air pressure, so that the air pressure of the heating plates continuously applies different stages of temperature to the corrugated board, so that the corrugated core board inside the corrugated board gradually forms and dries with the linerboard to form multi-layer corrugated paper.

[0007] This invention uses a corrugated paper paste drying assembly positioned after all corrugators along the conveying direction. This assembly heats and bonds the corrugated paper formed by the interlocking of multiple corrugators to create multi-layer corrugated paper. This multi-layer corrugated paper is conveyed along the carton production conveying direction. During this conveying process, the multi-layer corrugated paper is bonded and heated in the corrugated paper paste drying assembly to form corrugated cardboard. This design allows for the layering and bonding of multiple corrugated paper layers as needed, increasing the thickness and quality of the corrugated cardboard. Furthermore, it allows for the activation of one or more corrugators to produce single-wall, double-wall, and triple-wall corrugated cardboard. Specifically, single-wall corrugated cardboard is a three-layer corrugated cardboard consisting of two layers of linerboard and one layer of corrugated paper bonded together; double-wall corrugated cardboard is a five-layer corrugated cardboard consisting of three layers of linerboard and two layers of corrugated paper bonded together; and triple-wall corrugated cardboard is a seven-layer corrugated cardboard consisting of four layers of linerboard and three layers of corrugated paper bonded together.

[0008] Simultaneously, by adjusting the baking angle of the corrugated heating roller, the pressure applied by the corrugated heating roller to the surface of the original paper is effectively controlled within a range of 48%-50%. This ensures that during the corrugating process, the corrugated heating roller pushes down and evaporates the moisture in the original paper surface. By controlling the pressure range at 48%-50%, the corrugated core paper can absorb some of the moisture from the adhesive when absorbing moisture from the factory environment. This maintains the moisture content of the corrugated core paper and prevents premature gelatinization of the adhesive inside the corrugated paper due to excessive heating during the heating and pressing process.

[0009] Furthermore, the corrugated paper drying assembly uses a multi-stage corrugated paper machine to heat and bond the corrugated paper output from the multi-stage corrugating machine. During the bonding and heating process, multiple sheets of corrugated paper output simultaneously are bonded together with adhesive to form multi-layer corrugated paper. Since the adhesive itself contains a large amount of water, the moisture content of the multi-layer corrugated paper increases. At this time, the heating plate in the corrugated paper drying assembly presses down and bonds the multiple sheets of corrugated paper. By adjusting the air pressure generated by the heating plate on the multiple sheets of corrugated paper, the air pressure of the heating plate continuously applies different stages of temperature to the corrugated paperboard, allowing the corrugated core board inside the corrugated paperboard to gradually form. Combined with the air pressure generated by the heating plate, the moisture in the adhesive is quickly forced to evaporate and the adhesive is cured. This avoids the corrugated core board from being deformed and wrinkled by pressing against the linerboard, thus preventing the corrugated paper from leaking. It also eliminates the need to increase the pressing time of the hot plate of the gluing machine, thereby avoiding the phenomenon of indentation on the corrugated paper.

[0010] 2) According to the production process for preventing corrugation marks on raw paper as described in 1), wherein: In step one, adjacent corrugating machines are equipped with a glue applicator along the conveying direction. The glue applicator has a glue applicator box facing the corrugating heating roller. The glue applicator box is located at the starting position of the corrugating heating roller in the rotation direction. The distance between the glue applicator box and the corrugating heating roller is the glue amount of the glue applicator box. The glue amount is adjusted according to the ambient temperature and humidity of the day. The adjustment range of the glue amount is 0.19g / ㎡-0.25g / ㎡.

[0011] During this process, adjacent corrugating machines, along the conveying direction, jointly apply glue to the corrugated core paper. The glue applicator within the applicator is positioned at the starting point of the corrugating heating roller's rotation direction, enabling the application of glue to the corrugated core paper. This allows the adhesive to adhere to the corrugated peaks and sides of the core paper. Simultaneously, the amount of adhesive applied in the glue applicator is controlled within a range of 0.19 g / m² to 0.25 g / m², effectively controlling the amount of adhesive. Even after the adhesive absorbs moisture from the factory environment, this controlled amount effectively controls the adhesive's viscosity, mitigating the reduction in adhesive viscosity compared to existing technologies.

[0012] 3) According to the production process for preventing corrugation marks on raw paper as described in 1), wherein: In step one, the pressure control of the corrugated heating roller on the original paper surface includes a corrugated heating roller pressure operating side and a corrugated heating roller pressure driving side. The corrugated heating roller pressure operating side is the side of the corrugated heating roller facing the operator to adjust or monitor its pressure, and the adjustment range of the corrugated heating roller pressure operating side is 16%-20.4%. The corrugated heating roller pressure driving side is the side of the corrugated heating roller to drive its rotation, and the adjustment range of the corrugated heating roller driving side is 16.3%-22%.

[0013] By adjusting the pressure of the corrugated heating roller on the operating side, which is the side of the roller facing the operator for pressure adjustment or monitoring, and setting the adjustment range of the pressure operating side to 16%-20.4%, combined with the adjustment range of the drive side to 16.3%-22%, the uniform and stable operation of the corrugated heating roller can be ensured. Furthermore, when both the pressure operating side and drive side are adjusted within this range, the shape of the corrugated core paper remains consistent during corrugation caused by the rollers engaging and heating, thus guaranteeing the forming quality and strength of the corrugated core paper.

[0014] 4) According to the production process for preventing corrugation marks on raw paper as described in 1), wherein: In step one, the wrapping angle of the corrugated heating roller to the inner paper of the original paper is 40%-48%, and the wrapping angle of the corrugated heating roller to the corrugated paper of the original paper is 30%.

[0015] The wrap angle refers to the contact angle between the base paper and the corrugated heating roller. A 40%-48% wrap angle between the corrugated heating roller and the base paper increases the contact area, thus improving preheating. This helps to better control the moisture and temperature of the corrugated paper in subsequent processing, ensuring the bonding quality. Conversely, a 30% wrap angle reduces the contact area, thus decreasing preheating. This helps to better control the moisture content of the corrugated paper during corrugating, preventing excessive drying or wetting.

[0016] 5) A production process for preventing corrugation marks on raw paper as described in 1), wherein: In step two, the corrugated paper pasting and drying assembly includes a pasting machine and a dryer. The multi-stage corrugating machine feeds corrugated paper to the pasting machine, which applies glue to each piece of corrugated paper and bonds them together to form multi-layer corrugated paper. The pasting machine feeds multi-layer corrugated paper to the dryer, where a heating platen in the dryer presses down the multi-layer corrugated paper to form multi-layer corrugated cardboard. The air pressure is adjusted to 2.5 Pa according to the ambient temperature and humidity. The temperature of the heating platen is set as a first stage temperature, a second stage temperature, and a third stage temperature. The first stage temperature is 2.5 J / (kg·K), and the second and third stage temperatures are both 5 J / (kg·K). This allows the air pressure of the heating platen to continuously apply different stages of temperature to the corrugated cardboard, allowing the corrugated core board inside the corrugated cardboard to gradually form and dry with the linerboard to form multi-layer corrugated paper.

[0017] Based on the ambient temperature and humidity, the air pressure was adjusted to 2.5 Pa. The heating plate was set to three temperatures: the first temperature, the second temperature, and the third temperature. The first temperature was 2.5 J / (kg·K), and the second and third temperatures were both 5 J / (kg·K). This allowed the air pressure of the heating plate to continuously apply different stages of temperature to the corrugated cardboard, gradually shaping the corrugated core board. Combined with the air pressure generated by the heating plate, this quickly forced the moisture in the adhesive to evaporate and solidify, thus preventing the corrugated core board from being deformed and wrinkled by pressing against the linerboard, which could lead to missing corrugations.

[0018] 6) A production process for preventing corrugation marks on raw paper as described in 1), wherein: The baking angle of the corrugated heating roller in the corrugating machine is reduced, and the downward pressure of the heating plate in the dryer is increased.

[0019] In the actual production process, the baking angle of the corrugated heating roller in the corrugating machine is reduced to meet the production temperature of the corrugated paper. In order to ensure the moisture content of the produced carton, the downward pressure of the heating plate in the dryer is appropriately increased. The downward pressure applied by the heating plate causes the corrugated cardboard formed by the bonding and heating of multiple layers of corrugated paper to evaporate moisture quickly due to the downward pressure, thereby ensuring the moisture content of the corrugated cardboard.

[0020] 7) A production process for preventing corrugation marks on raw paper according to 6), wherein: The baking angle is determined by the production carton conveying speed and the weight of the original paper surface, with the conveying speed being 110-130 m / min and the weight of the original paper surface being 120-200 g / m. 2 The baking angle is the angle formed by connecting the two sides of the contact surface between the outer surface of the corrugated heating roller and the surface of the original paper with the center point of the corrugated heating roller.

[0021] This invention adjusts the temperature of the corrugated paper output from the corrugating machine by controlling the production carton conveying speed and the weight of the original paper surface. When the weight of the original paper surface is a fixed value, the temperature of the output corrugated paper is adjusted by controlling the production carton conveying speed and the baking angle. When the production carton conveying speed is too fast, the contact time between the outer surface of the corrugated heating roller and the surface of the original paper surface is shorter, thereby increasing the baking angle. Conversely, the baking angle is reduced. Therefore, this invention adjusts the moisture content of the corrugated paper by controlling the temperature of the output corrugated paper, thus ensuring the quality of the corrugated paper.

[0022] 8) A production process for preventing corrugation marks on raw paper as described in 1), wherein: The corrugated paper paste drying assembly is equipped with an exhaust fan along the conveying direction, and the exhaust fan vents the corrugated paper for 15 seconds.

[0023] An exhaust fan, positioned along the conveyor direction in the corrugated paper drying assembly, draws air from the periphery of the corrugated paper, promoting airflow and accelerating the drying process. The exhaust fan improves drying efficiency, ensuring the corrugated paper dries quickly as it passes through the drying zone. The exhaust time is controlled to 15 seconds to rapidly evaporate moisture from the adhesive and allow it to solidify, preventing the corrugated core from pressing against the linerboard and causing deformation and wrinkling, thus avoiding gaps in the corrugated paper.

[0024] Compared with the prior art, the present invention also has the following technical effects: Compared to existing technologies, this invention utilizes the baking angle of the corrugated heating roller, the amount of adhesive applied, the air pressure of the heating plate, and the temperature of the heating plate at different stages. This allows the air pressure of the heating plate to continuously apply different stages of temperature to the corrugated cardboard, enabling the corrugated core board inside the cardboard to gradually form its corrugated top. Combined with the air pressure generated by the heating plate, this rapidly forces the moisture in the adhesive to evaporate and solidify, thereby preventing the corrugated core board from deforming and wrinkling due to pressure against the linerboard, thus avoiding the phenomenon of missing corrugations in the corrugated paper. Furthermore, it eliminates the need to increase the pressing time of the hot plate of the gluing machine, thus preventing indentations in the corrugated paper. Attached Figure Description

[0025] Figure 1 This is a flowchart of a production process for preventing indentation and creasing in the base paper according to the present invention. Detailed Implementation

[0026] The following detailed description illustrates the specific implementation method: See the example. Figure 1 As shown, this embodiment of a production process for preventing creases and indentations in the base paper includes the following steps: Step 1: A multi-stage corrugating machine is evenly set up along the carton production conveyor direction. Each stage of the corrugating machine has at least one set of corrugating heating rollers that grip and heat the original paper surface to form corrugations. One or more stages of the corrugating machine are started according to design requirements, ensuring that the outer surface of each stage's corrugating heating roller forms a baking angle with the surface of the original paper. The baking angle is adjusted according to the ambient temperature and humidity. The pressure of the corrugating heating rollers on the original paper surface is controlled within a range of 48%-50%. Step two: A corrugated paper paste drying assembly is installed after all corrugators along the conveying direction. The corrugated paper paste drying assembly has at least one set of heating plates that bond and heat the corrugated paper and linerboard to form multi-layer corrugated paper. The multi-layer corrugated paper is bonded and heated in the corrugated paper paste drying assembly to form corrugated board. The heating plates apply pressure to the multi-layer corrugated paper to generate air pressure, so that the air pressure of the heating plates continuously applies different stages of temperature to the corrugated board, so that the corrugated core board inside the corrugated board gradually forms and dries with the linerboard to form multi-layer corrugated paper.

[0027] In this embodiment, a corrugated paper paste drying assembly is installed after all the corrugators along the conveying direction. This assembly heats and bonds the corrugated paper formed by the interlocking of multiple corrugators to create multi-layer corrugated paper. This multi-layer corrugated paper is conveyed along the carton production conveying direction. During this conveying process, the multi-layer corrugated paper is bonded and heated in the corrugated paper paste drying assembly to form corrugated cardboard. This design allows for the bonding of multiple layers of corrugated paper as needed, increasing the thickness and quality of the corrugated cardboard. Furthermore, it allows for the activation of one or more corrugators to produce single-wall, double-wall, and triple-wall corrugated cardboard. Single-wall corrugated cardboard is a three-layer corrugated cardboard consisting of two layers of linerboard and one layer of corrugated paper. Double-wall corrugated cardboard is a five-layer corrugated cardboard consisting of three layers of linerboard and two layers of corrugated paper. Triple-wall corrugated cardboard is a seven-layer corrugated cardboard consisting of four layers of linerboard and three layers of corrugated paper.

[0028] Simultaneously, by adjusting the baking angle of the corrugated heating roller, the pressure applied by the corrugated heating roller to the surface of the original paper is effectively controlled within a range of 48%-50%. This ensures that during the corrugating process, the corrugated heating roller pushes down and evaporates the moisture in the original paper surface. By controlling the pressure range at 48%-50%, the corrugated core paper can absorb some of the moisture from the adhesive when absorbing moisture from the factory environment. This maintains the moisture content of the corrugated core paper and prevents premature gelatinization of the adhesive inside the corrugated paper due to excessive heating during the heating and pressing process.

[0029] Furthermore, the corrugated paper drying assembly uses a multi-stage corrugated paper machine to heat and bond the corrugated paper output from the multi-stage corrugating machine. During the bonding and heating process, multiple sheets of corrugated paper output simultaneously are bonded together with adhesive to form multi-layer corrugated paper. Since the adhesive itself contains a large amount of water, the moisture content of the multi-layer corrugated paper increases. At this time, the heating plate in the corrugated paper drying assembly presses down and bonds the multiple sheets of corrugated paper. By adjusting the air pressure generated by the heating plate on the multiple sheets of corrugated paper, the air pressure of the heating plate continuously applies different stages of temperature to the corrugated paperboard, allowing the corrugated core board inside the corrugated paperboard to gradually form. Combined with the air pressure generated by the heating plate, the moisture in the adhesive is quickly forced to evaporate and the adhesive is cured. This avoids the corrugated core board from being deformed and wrinkled by pressing against the linerboard, thus preventing the corrugated paper from leaking. It also eliminates the need to increase the pressing time of the hot plate of the gluing machine, thereby avoiding the phenomenon of indentation on the corrugated paper.

[0030] In step one, adjacent corrugating machines are equipped with glue applicators along the conveying direction. The glue applicator has a glue applicator box facing the corrugating heating roller. The glue applicator box is located at the starting position of the corrugating heating roller in the rotation direction. The distance between the glue applicator box and the corrugating heating roller is the glue amount of the glue applicator box. The glue amount is adjusted according to the ambient temperature and humidity of the day. The adjustment range of the glue amount is 0.19g / ㎡-0.25g / ㎡.

[0031] During this process, adjacent corrugating machines, along the conveying direction, jointly apply glue to the corrugated core paper. The glue applicator within the applicator is positioned at the starting point of the corrugating heating roller's rotation direction, enabling the application of glue to the corrugated core paper. This allows the adhesive to adhere to the corrugated peaks and sides of the core paper. Simultaneously, the amount of adhesive applied in the glue applicator is controlled within a range of 0.19 g / m² to 0.25 g / m², effectively controlling the amount of adhesive. Even after the adhesive absorbs moisture from the factory environment, this controlled amount effectively controls the adhesive's viscosity, mitigating the reduction in adhesive viscosity compared to existing technologies.

[0032] In addition, in step one, the pressure control of the corrugated heating roller on the original paper surface includes the corrugated heating roller pressure operation side and the corrugated heating roller pressure drive side. The corrugated heating roller pressure operation side is the side on which the corrugated heating roller faces the operator to adjust or monitor its pressure, and the adjustment range of the corrugated heating roller pressure operation side is 16%-20.4%. The corrugated heating roller pressure drive side is the side on which the corrugated heating roller is driven to rotate, and the adjustment range of the corrugated heating roller drive side is 16.3%-22%.

[0033] By adjusting the pressure of the corrugated heating roller on the operating side, which is the side of the roller facing the operator for pressure adjustment or monitoring, and setting the adjustment range of the pressure operating side to 16%-20.4%, combined with the adjustment range of the drive side to 16.3%-22%, the uniform and stable operation of the corrugated heating roller can be ensured. Furthermore, when both the pressure operating side and drive side are adjusted within this range, the shape of the corrugated core paper remains consistent during corrugation caused by the rollers engaging and heating, thus guaranteeing the forming quality and strength of the corrugated core paper.

[0034] Meanwhile, in this embodiment, the wrap angle of the corrugated heating roller to the inner liner of the base paper is 40%-48%, and the wrap angle of the corrugated paper to the base paper is 30%. The wrap angle refers to the contact angle between the base paper and the corrugated heating roller. A 40%-48% wrap angle increases the contact area between the base paper and the heating roller, thus improving the preheating effect. This helps to better control the moisture and temperature of the corrugated paper in subsequent processing, ensuring the bonding quality of the corrugated paper. A 30% wrap angle reduces the contact area between the base paper and the heating roller, thus reducing the preheating effect. This helps to better control the moisture content of the corrugated paper during corrugating, preventing excessive drying or wetting.

[0035] In addition, in step one, the baking angle of the corrugated heating roller in the corrugating machine is reduced, while the downward pressure of the heating platen in the dryer is increased. In this embodiment, during actual production, the baking angle of the corrugated heating roller in the corrugating machine is reduced to meet the production temperature of the corrugated paper. To ensure the moisture content of the produced cartons, the downward pressure of the heating platen in the dryer is appropriately increased. The downward pressure applied by the heating platen causes the corrugated cardboard formed by the bonding and heating of multiple layers of corrugated paper to evaporate moisture quickly, thereby ensuring the moisture content of the corrugated cardboard.

[0036] The baking angle is determined by the production carton conveyor speed and the weight of the raw paper, with an adjustment range of 110-130 m / min and a raw paper weight of 120-200 g / m. 2 The baking angle is the angle formed by connecting the two sides of the contact surface between the outer surface of the corrugated heating roller and the surface of the original paper with the center point of the corrugated heating roller.

[0037] This embodiment adjusts the temperature of the corrugated paper output from the corrugating machine by controlling the production carton conveying speed and the weight of the original paper surface. When the weight of the original paper surface is a fixed value, the temperature of the output corrugated paper is adjusted by controlling the production carton conveying speed and the baking angle. When the production carton conveying speed is too fast, the contact time between the outer surface of the corrugated heating roller and the surface of the original paper surface is shorter, thereby increasing the baking angle. Conversely, the baking angle is reduced. Therefore, this embodiment controls the temperature of the output corrugated paper to adjust the moisture content of the corrugated paper and ensure the quality of the corrugated paper.

[0038] Meanwhile, in step two, the corrugated paper pasting and drying assembly includes a pasting machine and a dryer. The multi-stage corrugating machine feeds corrugated paper to the pasting machine, which applies glue to each piece of corrugated paper and bonds them together to form multi-layer corrugated paper. The pasting machine feeds multi-layer corrugated paper to the dryer, where a heating plate in the dryer presses down the multi-layer corrugated paper to form multi-layer corrugated cardboard. The air pressure is adjusted to 2.5 Pa according to the ambient temperature and humidity of the day. The temperature of the heating plate is set as a first stage temperature, a second stage temperature, and a third stage temperature. The first stage temperature is 2.5 J / (kg·K), and the second and third stage temperatures are both 5 J / (kg·K). This allows the air pressure of the heating plate to continuously apply different stages of temperature to the corrugated cardboard, so that the corrugated core board inside the corrugated cardboard gradually forms and dries with the linerboard to form multi-layer corrugated paper.

[0039] Based on the ambient temperature and humidity, the air pressure was adjusted to 2.5 Pa. The heating plate was set to three temperatures: the first temperature, the second temperature, and the third temperature. The first temperature was 2.5 J / (kg·K), and the second and third temperatures were both 5 J / (kg·K). This allowed the air pressure of the heating plate to continuously apply different stages of temperature to the corrugated cardboard, gradually shaping the corrugated core board. Combined with the air pressure generated by the heating plate, this quickly forced the moisture in the adhesive to evaporate and solidify, thus preventing the corrugated core board from being deformed and wrinkled by pressing against the linerboard, which could lead to missing corrugations.

[0040] Finally, after step two, an exhaust fan is installed along the conveying direction in the corrugated paper drying assembly. The exhaust fan evacuates the corrugated paper for 15 seconds. This exhaust fan, positioned along the conveying direction, draws air from the periphery of the corrugated paper, promoting airflow and accelerating the drying process. The use of the exhaust fan improves drying efficiency, ensuring the corrugated paper dries quickly as it passes through the drying area. The 15-second exhaust time rapidly forces the moisture in the adhesive to evaporate and solidify, preventing the corrugated core from pressing against the linerboard and causing deformation and wrinkling, thus avoiding gaps in the corrugated paper.

[0041] In this embodiment, the baking angle of the corrugated heating roller, the amount of adhesive applied, the air pressure of the heating plate, and the temperature of the heating plate at different stages allow the air pressure of the heating plate to continuously apply different stages of temperature to the corrugated cardboard. This allows the corrugated core board inside the corrugated cardboard to gradually form, and the air pressure generated by the heating plate quickly forces the moisture in the adhesive to evaporate and solidify. This avoids the corrugated core board from being deformed and wrinkled by pressing against the linerboard, thus preventing the corrugation from being exposed. It also eliminates the need to increase the pressing time of the hot plate of the gluing machine, thereby avoiding the phenomenon of indentation on the corrugated cardboard.

[0042] The above are merely embodiments of the present invention. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A production process for preventing indentation marks on raw paper, characterized in that, Includes the following steps: Step 1: A multi-stage corrugating machine is evenly set up along the carton production conveyor direction. Each stage of the corrugating machine has at least one set of corrugating heating rollers that bite and heat the surface of the original paper to form corrugations. One or more stages of the corrugating machine are started according to design requirements, so that the outer surface of the corrugating heating roller of each stage forms a baking angle with the surface of the original paper. The baking angle is adjusted according to the ambient temperature and humidity of the day. The pressure of the corrugating heating roller on the surface of the original paper is adjusted within a range of 48%-50%. Step two: A corrugated paper paste drying assembly is installed after all corrugators along the conveying direction. The corrugated paper paste drying assembly has at least one set of heating plates for bonding and heating corrugated paper and linerboard to form multi-layer corrugated paper. The multi-layer corrugated paper is bonded and heated in the corrugated paper paste drying assembly to form corrugated board. The heating plates apply pressure to the multi-layer corrugated paper to generate air pressure, so that the air pressure of the heating plates continuously applies different stages of temperature to the corrugated board, so that the corrugated core board inside the corrugated board gradually forms and dries with the linerboard to form multi-layer corrugated paper.

2. The production process for preventing corrugation marks on raw paper according to claim 1, characterized in that: In step one, adjacent corrugating machines are equipped with a glue applicator along the conveying direction. The glue applicator has a glue applicator box facing the corrugating heating roller. The glue applicator box is located at the starting position of the corrugating heating roller in the rotation direction. The distance between the glue applicator box and the corrugating heating roller is the glue amount of the glue applicator box. The glue amount is adjusted according to the ambient temperature and humidity of the day. The adjustment range of the glue amount is 0.19g / ㎡-0.25g / ㎡.

3. The production process for preventing indentation marks on raw paper according to claim 1, characterized in that: In step one, the pressure control of the corrugated heating roller on the original paper surface includes a corrugated heating roller pressure operating side and a corrugated heating roller pressure driving side. The corrugated heating roller pressure operating side is the side of the corrugated heating roller facing the operator to adjust or monitor its pressure, and the adjustment range of the corrugated heating roller pressure operating side is 16%-20.4%. The corrugated heating roller pressure driving side is the side of the corrugated heating roller to drive its rotation, and the adjustment range of the corrugated heating roller driving side is 16.3%-22%.

4. The production process for preventing corrugation marks on raw paper according to claim 1, characterized in that: In step one, the wrapping angle of the corrugated heating roller to the inner paper of the original paper is 40%-48%, and the wrapping angle of the corrugated heating roller to the corrugated paper of the original paper is 30%.

5. The production process for preventing corrugation marks on raw paper according to claim 1, characterized in that: In step two, the corrugated paper pasting and drying assembly includes a pasting machine and a dryer. The multi-stage corrugating machine feeds corrugated paper to the pasting machine, which applies glue to each piece of corrugated paper and bonds them together to form multi-layer corrugated paper. The pasting machine feeds multi-layer corrugated paper to the dryer, where a heating platen in the dryer presses down the multi-layer corrugated paper to form multi-layer corrugated cardboard. The air pressure is adjusted to 2.5 Pa according to the ambient temperature and humidity. The temperature of the heating platen is set as a first stage temperature, a second stage temperature, and a third stage temperature. The first stage temperature is 2.5 J / (kg·K), and the second and third stage temperatures are both 5 J / (kg·K). This allows the air pressure of the heating platen to continuously apply different stages of temperature to the corrugated cardboard, allowing the corrugated core board inside the corrugated cardboard to gradually form and dry with the linerboard to form multi-layer corrugated paper.

6. The production process for preventing indentation marks on raw paper according to claim 1, characterized in that: The baking angle of the corrugated heating roller in the corrugating machine is reduced, and the downward pressure of the heating plate in the dryer is increased.

7. The production process for preventing indentation marks on raw paper according to claim 6, characterized in that: The baking angle is determined by the production carton conveying speed and the weight of the original paper surface, with the conveying speed being 110-130 m / min and the weight of the original paper surface being 120-200 g / m. 2 The baking angle is the angle formed by connecting the two sides of the contact surface between the outer surface of the corrugated heating roller and the surface of the original paper with the center point of the corrugated heating roller.

8. The production process for preventing indentation marks on raw paper according to claim 1, characterized in that: The corrugated paper paste drying assembly is equipped with an exhaust fan along the conveying direction, and the exhaust fan vents the corrugated paper for 15 seconds.

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