Corrugated board based on lumen type cooperation and automatic lumen matching production method thereof

Abstract

This invention relates to the field of corrugated board manufacturing technology and discloses a corrugated board based on flute type coordination and its automatic flute alignment production method. The board includes a face paper, a liner paper, a core paper, a B-flute layer disposed between the face paper and the core paper, and a C-flute layer disposed between the core paper and the liner paper. The individual flute width of the C-flute layer is 6.40 to 6.50 mm, and the individual flute width of the B-flute layer is 7.70 to 7.80 mm. This corrugated board based on flute type coordination and its automatic flute alignment production method, by setting the C-flute width to 6.40 to 6.50 mm and the B-flute width to 7.70 to 7.80 mm, ensures that the cumulative length of 5 C-flutes and 6 B-flutes is equal, forming a natural overlap cycle. Complete overlap is automatically achieved at the start and end of the cycle. Compared to ordinary BC corrugated board, this increases the overlap frequency by approximately 24%, resulting in denser support points and significantly improving flat crush resistance and the overall compressive strength of the corrugated box.

Description

Technical Field

[0001] This invention relates to the field of corrugated board manufacturing technology, specifically to a corrugated board based on flute type coordination and its automatic flute alignment production method. Background Technology

[0002] Corrugated cardboard is a multi-layered adhesive, consisting of at least one layer of corrugated core paper and one layer of cardboard. It has high mechanical strength and can withstand collisions and drops during handling. The actual performance of corrugated cardboard depends on three factors: the characteristics of the core paper and the cardboard, and the structure of the carton itself.

[0003] In the production of five-layer BC corrugated cardboard, the C-flute and B-flute of traditional corrugated cardboard adopt the conventional range values ​​in the GB / T 6544-2008 standard. The C-flute width is about 6.8 to 7.9 mm and the B-flute width is about 5.5 to 6.5 mm. There is no integer multiple periodic relationship between the two, and a stable periodic overlap cannot be formed. The natural overlap period is about 51.1 mm, and the overlap frequency is low, which limits the flat crush resistance value. At the same time, the existing production must rely on the installation of photoelectric sensors, mechanical corrugating devices or phase adjustment rollers upstream of the laminating machine to force the corrugation mechanism to align. This not only increases the equipment investment and maintenance costs, but also requires readjustment every time the machine is started, the order is changed or the speed is changed. At high speed, it is easy to produce continuous misalignment defects. The production flexibility is poor and it is difficult to adapt to multi-variety, small-batch orders. When switching to other corrugation combinations, the equipment versatility is poor. Summary of the Invention

[0004] The purpose of this invention is to provide a corrugated cardboard based on flute type coordination and an automatic flute alignment production method thereof, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a corrugated cardboard based on flute type cooperation, comprising a face paper, a liner paper, a core paper, a B-flute layer disposed between the face paper and the core paper, and a C-flute layer disposed between the core paper and the liner paper, wherein the individual flute width of the C-flute layer is 6.40 to 6.50 mm, and the individual flute width of the B-flute layer is 7.70 to 7.80 mm; The cumulative length of the five consecutive flutes of the C-flute layer is equal to the cumulative length of the six consecutive flutes of the B-flute layer, forming a natural overlap period with a length of 38.5 to 39.0 mm. At any starting position, the C-flute layer and the B-flute layer automatically complete a full overlap once every natural overlap cycle along the corrugation extension direction.

[0006] Preferably, the width of a single corrugation of the C-flute layer is 6.45 mm, and the width of a single corrugation of the B-flute layer is 7.74 mm; the length of the natural overlap period is 38.70 mm, which is exactly equal to the cumulative length of 5 C-flutes and simultaneously equal to the cumulative length of 6 B-flutes; within the natural overlap period, the C-flute layer and the B-flute layer completely overlap at the beginning of the period and completely overlap again at the end of the period, with the corrugations naturally staggered within the period, without any forced alignment structure.

[0007] Preferably, when the width of a single flute in the C-flute layer is 6.45 mm, the flute height of the C-flute layer is 3.5 to 4.0 mm, which fully meets the requirements for the flute width and flute height range of C-flute in GB / T6544-2008 standard; when the width of a single flute in the B-flute layer is 7.74 mm, the flute height of the B-flute layer is 2.5 to 3.0 mm, which fully meets the requirements for the flute width and flute height range of B-flute in GB / T6544-2008 standard; the flat crush strength of the corrugated cardboard is improved without changing any national standard testing parameters.

[0008] Preferably, since the length of the natural overlap cycle is 38.7 mm, compared to the approximately 51.1 mm overlap cycle length of ordinary BC corrugated cardboard with standard flute width, the overlap frequency of the corrugated cardboard is increased by about 24% within the same length range; within a single natural overlap cycle, the C-flute layer and the B-flute layer complete one complete overlap. The higher the frequency of repeated overlap along the length of the cardboard, the higher the flat crush resistance of the corrugated cardboard, thereby indirectly improving the overall compressive strength of the corrugated box made from the corrugated cardboard.

[0009] On the other hand, this application also proposes an automatic flute alignment production method for corrugated cardboard with flute type coordination, including the following steps: S1, preparing C-flute cardboard: preparing C-flute cardboard using a C-flute machine, setting the flute width of the corrugated roll of the C-flute machine to 6.40 to 6.50 mm, so that the width of a single C-flute in the prepared C-flute cardboard falls within this range; S2. Preparation of B-flute corrugated board: B-flute corrugated board is prepared using a B-flute corrugating machine. The width of the corrugated roll of the B-flute corrugating machine is set to 7.70 to 7.80 mm, so that the width of a single B flute in the prepared B-flute corrugated board falls within this range. S3. Conveying to the laminating machine: The C-flute cardboard prepared in step S1 and the B-flute cardboard prepared in step S2, together with the face paper and liner paper, are conveyed to the laminating machine. During the entire conveying process, no mechanical alignment mechanism or active alignment device is set up to adjust the relative position of the C-flute cardboard and the B-flute cardboard. S4. Composite pressing: The composite machine applies glue, heats and presses the incoming C-flute cardboard, B-flute cardboard, face paper and liner paper to form a five-layer corrugated cardboard.

[0010] Preferably, the corrugated roll width of the C-flute machine is precisely set to 6.45 mm, and the corrugated roll width of the B-flute machine is precisely set to 7.74 mm. The C-flute board and the B-flute board enter the laminating machine with any initial phase, without the need for initial position alignment. During the operation of the laminating machine, every time it advances 38.70 mm, the 5 consecutive C-flutes on the C-flute board and the 6 consecutive B-flutes on the B-flute board automatically complete a complete overlap. This overlap state repeats periodically without manual intervention or sensor detection.

[0011] Preferably, no photoelectric sensor, mechanical corrugation device, or phase adjustment roller is installed upstream of the laminating machine; the C-flute and B-flute corrugated boards are directly conveyed from their respective corrugators to the laminating machine without any active alignment process; even if the initial phase of the C-flute and B-flute changes randomly during the preceding production, due to the existence of the natural overlap period, after running for no more than one cycle, the two flute types will automatically enter a periodic overlap state, and no continuous misalignment defect will occur.

[0012] Preferably, the operating linear speed of the laminating machine is 100 to 300 meters per minute. Within this linear speed range, the periodic overlap between the C-flute layer and the B-flute layer is automatically maintained by the cooperative relationship of the flute width dimensions and is not affected by speed fluctuations. When the linear speed changes, there is no need to stop the machine to adjust any flute parameters.

[0013] Preferably, the corrugated rollers of the C-flute corrugating machine and the B-flute corrugating machine are replaceable corrugated roller structures. When other flute combinations need to be produced, the corrugated rollers of the C-flute corrugating machine are replaced with other flute width specifications, and the corrugated rollers of the B-flute corrugating machine are simultaneously replaced with corresponding flute width specifications that satisfy an integer multiple periodic relationship. The integer multiple periodic relationship is: integer m multiplied by the single flute width of the C-flute layer is equal to integer n multiplied by the single flute width of the B-flute layer, where m and n are coprime positive integers, and the single flute widths of the C-flute layer and the B-flute layer fall within the national standard flute width range of the corresponding flute types. The integers m and n are preferably 5 and 6, respectively.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are: First, by setting the C-flute width to 6.40 to 6.50 mm and the B-flute width to 7.70 to 7.80 mm, the cumulative length of 5 C-flutes and 6 B-flutes is equal, forming a natural overlapping cycle. The complete overlap is automatically completed at the beginning and end of the cycle. Compared with ordinary BC corrugated cardboard, the overlapping frequency is increased by about 24%, the support points are denser, and the flat crush resistance and the overall compressive strength of the corrugated box are significantly improved.

[0015] Secondly, after the C-flute and B-flute corrugators of this invention produce corrugated cardboard at the same dimensions, they are directly conveyed to the laminating machine along with the face paper and liner paper. No photoelectric sensors, corrugating devices, or phase adjustment rollers are installed. The two types of corrugated cardboard enter the laminating machine with any initial phase, and automatically complete a complete overlap every time they advance about 38.7 mm. Even if the initial phase changes randomly, it can automatically correct the error after no more than one cycle. The speed can be freely adjusted within the range of 100 to 300 meters per minute without stopping the machine for adjustment. It can also be extended to other flute combinations such as A-flute and B-flute by changing the corrugating rollers, which significantly improves the equipment's versatility and return on investment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the cross-sectional structure of the corrugated cardboard of the present invention; Figure 2 This is a flowchart of the corrugated cardboard production method of the present invention. Detailed Implementation

[0017] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] This invention provides the following technical solutions: Example 1 Please see Figure 1 A corrugated board based on flute type coordination includes a face paper, a liner paper, a core paper, a B-flute layer disposed between the face paper and the core paper, and a C-flute layer disposed between the core paper and the liner paper. The individual flute width of the C-flute layer is 6.40 to 6.50 mm, and the individual flute width of the B-flute layer is 7.70 to 7.80 mm. The cumulative length of the five consecutive flutes of the C-flute layer is equal to the cumulative length of the six consecutive flutes of the B-flute layer, forming a natural overlap period with a length of 38.5 to 39.0 mm. At any starting position, along the corrugated extension direction, the C corrugated layer and the B corrugated layer automatically complete a full overlap once every natural overlap cycle.

[0019] The width of a single corrugation in the C-flute layer is 6.45 mm, and the width of a single corrugation in the B-flute layer is 7.74 mm. The length of the natural overlap period is 38.70 mm, which is exactly equal to the cumulative length of 5 C-flutes and simultaneously equal to the cumulative length of 6 B-flutes. Within the natural overlap period, the C-flute and B-flute layers completely overlap at the beginning of the period and completely overlap again at the end of the period. The corrugations within the period are naturally staggered and distributed without forced alignment.

[0020] The width of a single flute in the C-flute layer is further defined as 6.45 mm and the width of a single flute in the B-flute layer as 7.74 mm, making the natural overlap period precise at 38.70 mm. This precise dimension not only falls completely within the national standard's allowable range, but also ensures that the cumulative length of 5 C-flutes and 6 B-flutes is exactly equal, eliminating period drift caused by the accumulation of dimensional tolerances. Under this precise dimension, the C-flutes and B-flutes achieve complete overlap at the start and end of the period, while the flutes within the period are naturally staggered. This ensures the stability of the periodic overlap and avoids the additional stress caused by the forced alignment structure, thereby improving the flat crush strength while maintaining the flexibility and cushioning performance of the corrugated cardboard.

[0021] When the width of a single flute in a C-flute layer is 6.45 mm, the flute height of that C-flute layer is 3.5 to 4.0 mm, which fully meets the requirements for flute width and flute height range of C-flute in GB / T6544-2008 standard; when the width of a single flute in a B-flute layer is 7.74 mm, the flute height of that B-flute layer is 2.5 to 3.0 mm, which fully meets the requirements for flute width and flute height range of B-flute in GB / T6544-2008 standard; the flat crush strength of the corrugated cardboard is improved without changing any national standard testing parameters.

[0022] The further limitation on the flute height of C-flute and B-flute layers allows the corrugated cardboard of this application to achieve improved flat crush strength without changing any national standard testing parameters. This eliminates the need for companies to adjust existing testing standards and equipment or to undergo product recertification, significantly reducing the barriers and costs of technical implementation. At the same time, since all dimensional parameters are within the national standard range, the corrugated cardboard can still pass various physical performance tests normally, possessing good compliance and market access conditions.

[0023] Because the length of the natural overlap cycle is 38.7 mm, compared to the approximately 51.1 mm overlap cycle length of ordinary BC corrugated cardboard with standard flute width, the overlap frequency of the corrugated cardboard is increased by about 24% within the same length range. Within a single natural overlap cycle, the C-flute layer and the B-flute layer complete one complete overlap. The higher the frequency of repeated overlap along the length of the cardboard, the higher the flat crush resistance of the corrugated cardboard, thereby indirectly improving the overall compressive strength of the corrugated boxes made from this corrugated cardboard.

[0024] Compared to ordinary BC corrugated cardboard with a standard flute width and an overlap period of approximately 51.1 mm, the natural overlap period of this application is 38.7 mm, which increases the overlap frequency by approximately 24% within the same length range. The higher overlap frequency means that the support points between the C and B flutes are more densely packed, and the flat crush resistance of the corrugated cardboard can be significantly improved, thereby indirectly improving the overall compressive strength of the corrugated boxes made from this corrugated cardboard.

[0025] Example 2 Please see Figure 2 An automatic flute alignment production method for corrugated cardboard based on flute type coordination includes the following steps: S1, preparing C-flute cardboard: preparing C-flute cardboard using a C-flute machine, setting the flute width of the C-flute machine to 6.40 to 6.50 mm, so that the width of a single C-flute in the prepared C-flute cardboard falls within this range; S2. Preparation of B-flute corrugated board: B-flute corrugated board is prepared using a B-flute corrugating machine. The width of the corrugated roll of the B-flute corrugating machine is set to 7.70 to 7.80 mm, so that the width of a single B flute in the prepared B-flute corrugated board falls within this range. S3. Conveying to the laminating machine: The C-flute cardboard prepared in step S1 and the B-flute cardboard prepared in step S2, together with the face paper and liner paper, are conveyed to the laminating machine. During the entire conveying process, no mechanical alignment mechanism or active alignment device is set up to adjust the relative position of the C-flute cardboard and the B-flute cardboard. S4. Lamination and pressing: The laminating machine applies glue, heats and presses the incoming C-flute corrugated board, B-flute corrugated board, face paper and liner paper to form a five-layer corrugated board.

[0026] The flute width of the C-flute corrugating machine is precisely set to 6.45 mm, and the flute width of the B-flute corrugating machine is precisely set to 7.74 mm. The C-flute and B-flute corrugated boards enter the laminating machine with any initial phase, without the need for initial position alignment. During the operation of the laminating machine, every time the machine advances 38.70 mm, the 5 consecutive C-flutes on the C-flute corrugated board and the 6 consecutive B-flutes on the B-flute corrugated board automatically complete a complete overlap. This overlap state repeats periodically without manual intervention or sensor detection.

[0027] The design further defines the flute widths of C-flute and B-flute corrugated machines, and clarifies that C-flute and B-flute corrugated boards can enter the laminating machine at any initial phase without the need for initial alignment. This feature eliminates the phase adjustment process that must be performed every time the machine is started or a new order is changed in traditional production, significantly shortening production preparation time. At the same time, the laminating machine automatically completes a full overlap every 38.70 mm of forward movement. This overlap state repeats periodically without manual intervention or sensor detection, achieving fully automatic flute alignment and significantly reducing labor costs and operational errors.

[0028] The laminating machine is not equipped with photoelectric sensors, mechanical corrugation devices, or phase adjustment rollers upstream. C-flute and B-flute corrugated board are directly fed to the laminating machine from their respective corrugators without any active alignment process. Even if the initial phase of C-flute and B-flute changes randomly during the preceding production, due to the existence of a natural overlap cycle, after running for no more than one cycle, the two flute types will automatically enter a periodic overlap state, and no continuous misalignment defects will occur.

[0029] This further restricts the installation of photoelectric sensors, mechanical corrugation devices, and phase adjustment rollers upstream of the laminating machine, completely eliminating all the detection and execution components required for traditional corrugation. This directly reduces equipment investment costs and reduces the failure points and maintenance workload of moving parts. In addition, even if the initial phases of corrugations C and B change randomly during the preceding production process, due to the existence of a natural overlap period, after running for no more than one cycle, the two corrugation types will automatically enter a periodic overlap state, preventing continuous corrugation defects and exhibiting self-correcting characteristics.

[0030] The linear speed of the laminating machine is 100 to 300 meters per minute. Within this speed range, the periodic overlap between the C-flute layer and the B-flute layer is automatically maintained by the coordination of the flute width dimensions and is not affected by speed fluctuations. When the linear speed changes, there is no need to stop the machine to adjust any flute parameters.

[0031] Within this speed range, the periodic overlap is automatically maintained by the coordination relationship of the flange width dimensions, unaffected by speed fluctuations. This allows the production line to freely adjust its speed within the normal speed range to adapt to different order requirements without stopping to adjust the flange alignment parameters. Compared to traditional mechanical flange alignment mechanisms that require readjustment of the phase difference when the speed changes, this achieves automatic flange alignment independent of speed, significantly improving the flexibility and uptime of the production line, and is especially suitable for multi-variety, small-batch order production modes.

[0032] The corrugated rollers of both the C-type and B-type corrugated machines are replaceable. When other flute combinations are required, the corrugated rollers of the C-type machine are replaced with other flute width specifications, and the corrugated rollers of the B-type machine are simultaneously replaced with the corresponding flute width specifications that satisfy the integer multiple periodic relationship. The integer multiple periodic relationship is as follows: the integer m multiplied by the single flute width of the C-type corrugated layer is equal to the integer n multiplied by the single flute width of the B-type corrugated layer, where m and n are coprime positive integers, and the single flute widths of the C-type and B-type corrugated layers fall within the national standard flute width range of the corresponding flute types. The preferred values ​​for the integers m and n are 5 and 6, respectively.

[0033] Where m and n are coprime positive integers, this application is not limited to combinations of C-flute and B-flute, but can also be applied to other flute combinations such as A-flute and B-flute, B-flute and E-flute, A-flute and C-flute, as long as the flute width is adjusted within the national standard range to meet the above relationship; at the same time, the corrugated roller adopts a replaceable structure, and enterprises only need to prepare corrugated rollers of different specifications to flexibly switch to produce products with different flute combinations, which greatly improves the versatility of the equipment and the return on investment.

[0034] In use, a C-flute corrugated board is prepared using a C-flute machine with a flute width of 6.40 to 6.50 mm. Simultaneously, a B-flute corrugated board is prepared using a B-flute machine with a flute width of 7.70 to 7.80 mm. The individual flute widths of the C-flute and B-flute layers are designed to satisfy a periodic relationship where the cumulative length of five consecutive C-flutes is an integer multiple of the cumulative length of six consecutive B-flutes. The prepared C-flute and B-flute corrugated boards, along with the linerboard and face paper, are then fed to the laminating machine. No additional settings are used during the entire conveying process. The mechanical flute alignment mechanism or active flute alignment device adjusts the relative position of the two corrugated cardboard pieces. The two types of corrugated cardboard enter the laminating machine with any initial phase. Finally, the laminating machine applies glue, heats and presses all the materials into the machine to form a five-layer corrugated cardboard. During the lamination process, the periodic overlapping flute alignment is automatically achieved entirely by relying on the cooperative relationship of the flute width dimensions. Every time the C flute advances by about 38.7 mm, the B flute and C flute automatically complete a complete overlap. Even if the initial phase changes randomly, the machine can automatically enter the periodic overlapping state after running for no more than one cycle.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A corrugated cardboard based on flute type cooperation, comprising a face paper, a liner paper, a core paper, a B-flute layer disposed between the face paper and the core paper, and a C-flute layer disposed between the core paper and the liner paper, characterized in that: The individual flute width of the C-flute layer is 6.40 to 6.50 mm, and the individual flute width of the B-flute layer is 7.70 to 7.80 mm; The cumulative length of the five consecutive flutes of the C-flute layer is equal to the cumulative length of the six consecutive flutes of the B-flute layer, forming a natural overlap period with a length of 38.5 to 39.0 mm. At any starting position, the C-flute layer and the B-flute layer automatically complete a full overlap once every natural overlap cycle along the corrugation extension direction.

2. The corrugated cardboard based on flute type coordination according to claim 1, characterized in that: The width of a single corrugation in the C-flute layer is 6.45 mm, and the width of a single corrugation in the B-flute layer is 7.74 mm. The length of the natural overlap period is 38.70 mm, which is exactly equal to the cumulative length of 5 C-flutes and simultaneously equal to the cumulative length of 6 B-flutes. Within the natural overlap period, the C-flute layer and the B-flute layer completely overlap at the beginning of the period and completely overlap again at the end of the period. The corrugations within the period are naturally staggered and distributed without any forced alignment structure.

3. A corrugated cardboard based on flute type coordination according to claim 1, characterized in that: When the width of a single flute in the C-flute layer is 6.45 mm, the flute height of the C-flute layer is 3.5 to 4.0 mm, which fully meets the requirements for the flute width and flute height range of C-flute in GB / T6544-2008 standard; when the width of a single flute in the B-flute layer is 7.74 mm, the flute height of the B-flute layer is 2.5 to 3.0 mm, which fully meets the requirements for the flute width and flute height range of B-flute in GB / T6544-2008 standard; the flat crush strength of the corrugated cardboard is improved without changing any national standard testing parameters.

4. A corrugated cardboard based on flute type coordination according to claim 1, characterized in that: Since the length of the natural overlap cycle is 38.7 mm, compared to the approximately 51.1 mm overlap cycle length of ordinary BC corrugated cardboard with standard flute width, the overlap frequency of the corrugated cardboard is increased by about 24% within the same length range. Within a single natural overlap cycle, the C-flute layer and the B-flute layer complete one complete overlap. The higher the frequency of repeated overlap along the length of the cardboard, the higher the flat crush resistance of the corrugated cardboard, thereby indirectly improving the overall compressive strength of the corrugated box made from this corrugated cardboard.

5. An automated flute alignment production method for corrugated cardboard based on the flute pattern coordination described in any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Preparation of C-flute corrugated cardboard: C-flute corrugated cardboard is prepared using a C-flute corrugating machine. The width of the corrugated roll of the C-flute corrugating machine is set to 6.40 to 6.50 mm, so that the width of a single C-flute in the prepared C-flute corrugated cardboard falls within this range. S2. Preparation of B-flute corrugated board: B-flute corrugated board is prepared using a B-flute corrugating machine. The width of the corrugated roll of the B-flute corrugating machine is set to 7.70 to 7.80 mm, so that the width of a single B flute in the prepared B-flute corrugated board falls within this range. S3. Conveying to the laminating machine: The C-flute cardboard prepared in step S1 and the B-flute cardboard prepared in step S2, together with the face paper and liner paper, are conveyed to the laminating machine. During the entire conveying process, no mechanical alignment mechanism or active alignment device is set up to adjust the relative position of the C-flute cardboard and the B-flute cardboard. S4. Composite pressing: The composite machine applies glue, heats and presses the incoming C-flute cardboard, B-flute cardboard, face paper and liner paper to form a five-layer corrugated cardboard.

6. The automatic flute alignment production method for corrugated cardboard based on flute type coordination according to claim 5, characterized in that: The corrugated roll width of the C-flute machine is precisely set to 6.45 mm, and the corrugated roll width of the B-flute machine is precisely set to 7.74 mm; the C-flute board and the B-flute board enter the laminating machine with any initial phase, without the need for initial position alignment; During the operation of the laminating machine, every time it advances 38.70 mm, the five consecutive C-flutes on the C-flute cardboard and the six consecutive B-flutes on the B-flute cardboard automatically complete a full overlap. This overlap state repeats periodically without the need for manual intervention or sensor detection.

7. The automatic flute alignment production method for corrugated cardboard based on flute type coordination according to claim 5, characterized in that: The laminating machine is not equipped with photoelectric sensors, mechanical corrugation devices, or phase adjustment rollers upstream. The C-flute and B-flute corrugated boards are directly fed to the laminating machine from their respective corrugators without any active alignment process. Even if the initial phases of the C-flute and B-flute flutes change randomly during the preceding production, due to the existence of the natural overlap cycle, after running for no more than one cycle, the two flute types will automatically enter a periodic overlap state, and no continuous misalignment defects will occur.

8. The automatic flute alignment production method for corrugated cardboard based on flute type coordination according to claim 5, characterized in that: The operating linear speed of the laminating machine is 100 to 300 meters per minute. Within this linear speed range, the periodic overlap between the C-flute layer and the B-flute layer is automatically maintained by the cooperative relationship of the flute width dimensions and is not affected by speed fluctuations. When the linear speed changes, there is no need to stop the machine to adjust any flute parameters.

9. The automatic flute alignment production method for corrugated cardboard based on flute type coordination according to claim 5, characterized in that: The corrugated rollers of the C-type corrugating machine and the B-type corrugating machine are replaceable. When other flute combinations need to be produced, the corrugated rollers of the C-type corrugating machine are replaced with other flute width specifications, and the corrugated rollers of the B-type corrugating machine are simultaneously replaced with corresponding flute width specifications that satisfy an integer multiple periodic relationship. The integer multiple periodic relationship is: integer m multiplied by the single flute width of the C-type corrugated layer is equal to integer n multiplied by the single flute width of the B-type corrugated layer, where m and n are coprime positive integers, and the single flute widths of the C-type and B-type corrugated layers fall within the national standard flute width range of the corresponding flute types. The preferred values ​​for the integers m and n are 5 and 6, respectively.

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